Patent application number | Description | Published |
20090108769 | LIGHTING DEVICE AND ILLUMINATION APPARATUS - The present invention provides a lighting device capable of controlling finely modulated light control without stopping other processing regardless of an operation clock. The light modulation signal generating portion calculates a cycle of a PWM signal based on the lighting state of lamp, which is detected by state detecting portion and a predetermined operation clock. A PWM signal of the cycle calculated by the state detecting portion is generated by the light modulation signal generating portion capable of generating the PWM signal corresponding to the cycle of a non-integral number of times of the operation clock, wherein the cycle of the PWM signal can be continuously and finely varied without stopping other processing regardless of operation clocks, and fine modulated light control is enabled. | 04-30-2009 |
20090134813 | DISCHARGE LAMP LIGHTING DEVICE - The inverter circuit is feedback-controlled by a substantial current flowing into the discharge lamp, which is detected by the current detecting means. A high starting voltage is supplied to the discharge lamp with the operation frequency lowered by the control circuit after the end of a preheating action. The inverter circuit is controlled so that the current of the discharge lamp becomes a desired current value as soon as the current detecting means detects the current substantially flowing into the discharge lamp. The discharge lamp can be prevented from being instantaneously brightly lit without separately providing any structure for detecting lighting of the discharge lamp. | 05-28-2009 |
20100033106 | HIGH-PRESSURE DISCHARGE LAMP, HIGH-PRESSURE DISCHARGE LAMP LIGHTING SYSTEM AND LIGHTING EQUIPMENT - Disclosed is a high-pressure discharge lamp includes a translucent ceramics sealed container provided with an enclosed part with a discharge space formed therein, a pair of electrodes disposed inside of both end parts of the translucent sealed container, an ionization medium having a structure containing a metal halide that primarily emits light, a starting gas and substantially no mercury, the metal halide that primarily emits light including 30% by mass or more of a halide of at least one lanthanoid type rare earth metal and the starting gas having a pressure P (atm) satisfying the equation, 1≦P≦20, the ionization medium being sealed in the translucent ceramics sealed container, wherein the ratio D/G satisfies the equation, 0.3≦D/G≦2.4 when the maximum inside diameter of the translucent ceramics sealed container is D and the inter-electrode distance is G. | 02-11-2010 |
20100052565 | LED LIGHTING DEVICE AND LIGHTING EQUIPMENT - An LED lighting device includes light emitting diode, a current control circuit having a first series circuit of first and second switching elements, a second series circuit of third and fourth switching elements, and a condenser, which is configured so that the first and second series circuits are parallel connected and the condenser is connected between a connection point of the first and second switching elements and a connection point of the third and fourth switching elements, and a control circuit for alternatively on-off controlling a pair of the first and fourth switching elements and a pair of the second and third switching elements. | 03-04-2010 |
20100052566 | LED LIGHTING DEVICE AND LIGHTING EQUIPMENT - An LED lighting device including a DC power source circuit, a high frequency generation circuit which includes an inverter circuit having switching elements and a resonance circuit having a series-connected inductor and condenser, in which the switching elements are on-off controlled by a no-load resonance frequency of the resonance circuit, and DC voltage input from the DC power source circuit is converted into a high frequency AC voltage, a rectification smoothing circuit having an input side which is connected between both edges of the condenser or both edges of the inductor; and a light emitting diode series connected to an output side of the rectification smoothing circuit. | 03-04-2010 |
20100270470 | INFRARED RAY DETECTOR AND ELECTRICAL APPARATUS - The present invention provides an infrared ray detector capable of facilitating design of a compound lens and capable of reliably detecting a heat source in a stabilized state, which is provided with a light receiving portion for detecting infrared ray energies, and a compound lens having a plurality of lens portions to condense an infrared ray in a predetermined detection area to the light receiving portion, wherein individual detection areas which condense infrared rays to the light receiving portion through the respective lens portions of the compound lens exist in the entire range of a predetermined detection area, and at least a part of the individual detection areas overlap each other. | 10-28-2010 |
20120268033 | LED LIGHTING DEVICE AND LIGHTING EQUIPMENT - An LED lighting device including a DC power source circuit, a high frequency generation circuit which includes an inverter circuit having switching elements and a resonance circuit having a series-connected inductor and condenser, in which the switching elements are on-off controlled by a no-load resonance frequency of the resonance circuit, and DC voltage input from the DC power source circuit is converted into a high frequency AC voltage, a rectification smoothing circuit having an input side which is connected between both edges of the condenser or both edges of the inductor; and a light emitting diode series connected to an output side of the rectification smoothing circuit. | 10-25-2012 |
Patent application number | Description | Published |
20110109241 | LED LIGHTING DEVICE AND ILLUMINATING DEVICE - According to one embodiment, an LED lighting device comprises at least one normally-on type switching element, an output generation unit that generates DC output by an on-off operation of the switching element, a semiconductor light emitting element that is lit by the DC output generated by the output generation unit, and a driving control unit that causes the switching element to perform an off operation using a current passed through the semiconductor light emitting element. | 05-12-2011 |
20120175956 | DC POWER SUPPLY FEEDING SYSTEM - According to one embodiment of a DC power supply feeding system, the system includes a DC voltage power supply that outputs a specified voltage by using a commercial AC power supply, a varying voltage power supply that generates power by using natural energy and outputs a varying voltage, and a reverse flow preventing elements that connects the DC voltage power supply and the varying voltage power supply in parallel while output sides are made to have same polarity, and supplies powers obtained from the DC voltage power supply and the varying voltage power supply to a load. When an amount of power generation of the varying voltage power supply is small, the power is intermittently supplied to the load. | 07-12-2012 |
20130119866 | Luminaire and Lighting Method - According to one embodiment, a luminaire includes a light source that generates heat, a dome inside of which the light source is accommodated, and a globe covering the light source through the dome. At least part of the dome and at least part of the globe are translucent or transparent. A liquid is sealed in a space formed between the dome and the globe. | 05-16-2013 |
20130257304 | Switching Power Source Device and Illuminating Apparatus - A switching power source device includes: a direct power source; and a chopper circuit including a pair of input terminals connected to the direct power source and a pair of output terminals connected to a load, the chopper circuit including a first inductor, a second inductor magnetically coupled to the first inductor, a third inductor connected to the first inductor, a switching element causing an augmented current to flow from the direct power source to the first and third inductors while turned on, a constant current element connected to the switching element in series, a rectifier element causing a reduced current to flow through the first and third inductors while the switching element is turned off, and a drive circuit controlling and turning off a gate voltage of the switching element after the switching element is turned on and the augmented current reaches a constant current element saturated state. | 10-03-2013 |
20140015432 | POWER SUPPLY, SOLID-STATE LIGHT-EMITTING ELEMENT LIGHTING DEVICE, AND LUMINAIRE - According to one embodiment, a power supply device includes a full-wave rectifier, a power converting circuit, and a partial smoothing circuit. The power converting circuit converts an output of the full-wave rectifier into a direct-current voltage according to a switching action of a switching element. The partial smoothing circuit includes, in series, a capacitor and a first diode connected in polarity opposite to output polarity of the full-wave rectifier. The partial smoothing circuit is provided on an output side of the full-wave rectifier in parallel to the power converting circuit. In the partial smoothing circuit, the capacitor is charged according to the switching action of the switching element of the power converting circuit. The partial smoothing circuit supplies charged electric of the capacitor to the power converting circuit via the first diode in a trough portion of an output voltage of the full-wave rectifier. | 01-16-2014 |
20140159604 | Power Supply Circuit and Luminaire - A power supply circuit includes a power converting unit, a current adjusting unit, and a control unit. The power converting unit is configured to convert an alternating-current voltage into a direct-current voltage and supply the direct-current voltage to a load. The alternating-current voltage is subjected to conduction angle control and is supplied via a power supply path. The current adjusting unit includes a branch path electrically connected to the power supply path and can switch a first path state and a second path state. The first path state feeds a part of an electric current flowing through the power supply path to the branch path. The control unit detects a conduction angle of the alternating-current voltage, controls the conversion of the direct-current voltage by the power converting unit according to the detected conduction angle, and controls the current adjusting unit according to the detected conduction angle. | 06-12-2014 |
20140197737 | Electrical Equipment - Electrical equipment includes a switching power source, a rectifier circuit, a pair of capacitative elements, and a load. The switching power source outputs an alternating-current voltage with input of a direct-current or an alternating-current power source voltage. The pair of capacitative elements are connected between the switching power source and the rectifier circuit and insulate the switching power source and the rectifier circuit. The load is connected as a load circuit to an output of the rectifier circuit and driven by a constant current. | 07-17-2014 |
20140197753 | Switching Power Source and Lighting Device - A switching power source includes first and second inductors, a switching element, current control element, rectifier element, and control circuit. The switching element supplies a power source voltage to the first inductor. The current control element detects a current flowing in the switching element and has first and second main terminals, and a control terminal, with the second main terminal connected to the switching element. The control circuit turns off the current control element and interrupts the current flowing in the switching element when a voltage between the second main terminal and the first main terminal of the current control element is equal to or higher than a specified value. The rectifier circuit is series-connected to one of the switching element and the current control element. The second inductor is magnetically coupled to the first inductor, in which a potential turning on and off the switching element can be induced. | 07-17-2014 |
20140217919 | LED LIGHTING DEVICE AND ILLUMINATING DEVICE - According to one embodiment, an LED lighting device comprises at least one normally-on type switching element, an output generation unit that generates DC output by an on-off operation of the switching element, a semiconductor light emitting element that is lit by the DC output generated by the output generation unit, and a driving control unit that causes the switching element to perform an off operation using a current passed through the semiconductor light emitting element. | 08-07-2014 |
20140232280 | Rectifying Circuit and Power Supply Circuit - According to one embodiment, a rectifying circuit includes a diode, a switching element, a capacitor and an auxiliary winding. The diode is connected between a first terminal and a second terminal while a direction directed from the second terminal to the first terminal is a forward direction. The switching element includes a first main electrode connected to the first terminal, a second main electrode connected to a cathode of the diode, and a gate electrode connected to an anode of the diode. The auxiliary winding is magnetically coupled to an inductor. The auxiliary winding is connected to the gate electrode through the capacitor, and is connected to the second main electrode of the switching element and the cathode of the diode. | 08-21-2014 |
20140232281 | Rectifier Circuit and Power Source Circuit - According to an embodiment, a rectifier circuit includes a first diode, a switching element, and a second diode. The first diode is connected between a first terminal and a second terminal so that a direction toward the first terminal from the second terminal is in a forward direction. The switching element has a first main electrode connected to the first terminal, a second main electrode connected to a cathode of the first diode, and a gate electrode connected to an anode of the first diode. The second diode is connected in parallel with respect to the switching element so that a direction toward the first terminal from the cathode of the first diode is in a forward direction, between the first main electrode and the second main electrode of the switching element. | 08-21-2014 |
20140285089 | Power Supply Circuit and Illuminating Device - According to one embodiment, a power supply circuit includes: a DC-DC converter which converts a first DC voltage supplied from a power supply flow path into a second DC voltage having a different absolute value, to supply the voltage to a DC load; and an overcurrent protection unit which is electrically connected to an end portion of the DC load on a low potential side, and performs feedback control of the DC-DC converter based on current which flows to the DC load. The DC-DC converter includes a normally-on type switching element. The overcurrent protection unit is electrically connected to the third electrode. When the current which flows to the DC load is greater than a reference value, the overcurrent protection unit changes the state of the switching element from the first state to the second state by decreasing the potential of the third electrode. | 09-25-2014 |
20140285099 | Power Supply Circuit and Illumination Apparatus - According to one embodiment, there is provided a power supply circuit including a power conversion unit, a current regulator, a controller, and a controller power supply. The power conversion unit converts an AC voltage with a controlled conduction angle into a different voltage. The current regulator includes a branch path electrically connected to the power supply path and switches between a first state in which a part of a current flowing through the power supply path flows to the branch path and a second state in which a current flowing to the branch path is lower than that of the first state. The controller switches the current regulator to the second state in at least a part of a conduction period of a detected conduction angle and switches the current regulator to the first state in a blocking period of the detected conduction angle. | 09-25-2014 |
20140285100 | Power Supply Circuit and Illumination Apparatus - According to one embodiment, provided is a power supply circuit including a power conversion unit, a controller, and an integrated circuit. The power conversion unit converts an AC voltage into a different voltage. The integrated circuit includes a current regulator that can switch between a first state in which a part of a current flowing through the power supply path flows to an input terminal and a second state in which a current flowing to the input terminal is lower than that of the first state, a controller power supply that converts a voltage into a driving voltage and supplies the driving voltage to the controller, a connection terminal for connecting an auxiliary power supply used for generating the driving voltage, and a protection circuit that blocks or decreases, when an auxiliary power supply voltage of the auxiliary power supply decreases, a current flowing to the input terminal. | 09-25-2014 |
20140285101 | Lighting Power Source and Lighting Device - According to one embodiment, a lighting light source including a current control element and a voltage-dividing resistor is provided. The current control element has a first main electrode, a second main electrode series-connected with respect to a lighting light source, and a first control electrode for controlling a current flowing between the first main electrode and the second main electrode, and controls a current supplied to the lighting light source. The voltage-dividing resistor is parallel-connected with respect to the lighting light source and connected to the first control electrode, and inputs a voltage obtained by division of a voltage of the lighting light source to the first control electrode. | 09-25-2014 |
20140285106 | Detection Circuit, Power Circuit, and Luminaire - According to one embodiment, a detection circuit including first and second comparators and a determining unit is provided. The first comparator includes a first input terminal for inputting a first detection voltage, a second input terminal for inputting a first threshold voltage, and a first output terminal configured to output a first output signal. The second comparator includes a third input terminal for inputting a second detection voltage, a fourth input terminal for inputting a second threshold voltage higher than the first threshold voltage, and a second output terminal configured to output a second output signal. The determining unit is configured to determine the presence or absence of conduction angle control of an AC voltage and whether the conduction angle control is a phase control system or an opposite phase control system on the basis of a time difference between the first output signal and the second output signal. | 09-25-2014 |
20140285176 | Power-Supply Circuit and Luminaire - According to one embodiment, there is provided a power-supply circuit including a substrate, a chopper circuit, a conductive member, first capacitative elements, and second capacitative elements. The substrate includes a mounting surface. The chopper circuit is provided on the mounting surface, includes input ends, output ends, and a switching element, and converts a voltage input from the input ends and outputs the voltage from the output ends according to switching driving of the switching element. The conductive member is adjacent to at least a part of the chopper circuit. The first capacitative elements are electrically connected between the input ends and the conductive member and capacitively couple the input ends and the conductive member. The second capacitative elements are electrically connected between the output ends and the conductive member and capacitively couple the output ends and the conductive member. | 09-25-2014 |
20150042235 | Power Supply Device and Illumination Device - According to one embodiment, a power supply device includes a substrate, a first inductor, and a second inductor. The substrate has a first surface and a second surface on opposite side from the first surface. The first inductor includes a first coil having a coil center axis substantially parallel to a first direction, is used for a switching circuit for controlling power supplied to a load, and is mounted on the first surface of the substrate. The second inductor includes a second coil having a coil center axis substantially parallel to the first direction, is electrically connected to the first inductor, and is mounted on the second surface of the substrate. As viewed in a direction orthogonal to the first surface, position of the first coil of the first inductor does not overlap position of the second coil of the second inductor. | 02-12-2015 |
20150084510 | Power Supply Device and Luminaire - According to one embodiment, there is provided a power supply device includes a DC-DC converter and a protection circuit. The DC-DC converter includes a switching element of a normally on type, a current control element of the normally on type connected to the switching element in series and configured to control an electric current flowing to the switching element, and a rectifying element connected to the current control element in series. The DC-DC converter converts, according to ON and OFF of the switching element, an input first direct-current voltage into a second-direct current voltage, which has an absolute value different from an absolute value of the first direct-current voltage, and supplies the second direct-current voltage to a load. When an electric current equal to or larger than a predetermined value flows to the switching element and the current control element, the protection circuit cuts off the electric current. | 03-26-2015 |
20150084528 | Power Supply Device and Luminaire - According to one embodiment, a power supply device includes a rectifier circuit, a smoothing capacitor, and a normally on type transistor. The rectifier circuit is configured to rectify an alternating current supplied from a voltage source. The smoothing capacitor is charged by an output current output from the rectifier circuit. The normally on type transistor is connected between the rectifier circuit and the smoothing capacitor in series and is configured to limit an output current value of the rectifier circuit during a voltage input from the voltage source to an output current value higher than an output current value of the rectifier circuit during a steady operation. | 03-26-2015 |
20150084529 | Power Supply Device, Luminaire, and Lighting System - According to one embodiment, a power supply device includes a terminal connected to an output of a dimmer, a rectifier circuit, a switching circuit including an inductor, a switching element connected to the inductor in series, and a first rectifying element and configured to change the switching element to an ON state to feed an output current of the rectifier circuit to the inductor, after the dimmer changes from a non-conduction state to a conduction state, when the dimmer is a dimmer of a phase control type, and configured to change the switching element to the ON state to feed the output current of the rectifier circuit to the inductor, after the dimmer changes from the non-conduction state to the conduction state, when the dimmer is a dimmer of an anti-phase control type, and a DC-DC converter configured to convert the output voltage of the switching circuit. | 03-26-2015 |
20150084530 | Power Supply Device and Luminaire - According to one embodiment, a power supply device includes a conductive first mounting board, a first switching element, a current control element, and a second switching element. The first switching element is mounted on the first mounting board. The current control element is mounted on the first mounting board, includes a main terminal connected to the first mounting board, is connected to the first switching element in series, and is configured to limit an electric current of the first switching element. The second switching element is connected to the current control element in series. An electric current flows to the second switching element when the first switching element is off. | 03-26-2015 |
20150084531 | Power Supply Device and Luminaire - According to one embodiment, a power supply device includes a first inductor, a current control section configured to limit a current value of an electric current flowing through the first inductor to a predetermined current value, the current control section including a first switching element of a normally on type and a resistor connected to a main terminal of the first switching element, a rectifying element connected to the current control section in series, and a second inductor magnetically coupled to the first inductor. The second inductor is configured to induce a voltage for turning on the current control section, when the electric current of the first inductor increases, to induce a voltage for turning off the current control section, when the electric current of the first inductor decreases, and to supply the induced voltage to a control terminal of the current control section. | 03-26-2015 |
20150085544 | Rectifying Circuit, Electronic Circuit, and Electronic Apparatus - A rectifying circuit according to an embodiment includes a first rectifying portion and a second rectifying portion. The first rectifying portion has a positive temperature coefficient. The second rectifying portion has a negative temperature coefficient, is connected in parallel to the first rectifying portion, and has a forward voltage-forward current curve intersecting a forward voltage-forward current curve of the first rectifying portion. | 03-26-2015 |
Patent application number | Description | Published |
20110316494 | SWITCHING POWER SUPPLY DEVICE, SWITCHING POWER SUPPLY CIRCUIT, AND ELECTRICAL EQUIPMENT - According to an embodiment of the invention, there is provided a switching power supply device including an integrated body and a plurality of external terminals. In the integrated body, a first switching element, a constant current element, and a diode are connected in series. The plurality of external terminals include a first external terminal connected to a main terminal of an element disposed on one end side of the integrated body and a second external terminal connected to a main terminal of an element disposed on another end side of the integrated body. | 12-29-2011 |
20120069616 | SWITCHING POWER SUPPLY DEVICE, AND ADJUSTABLE POWER SUPPLY SYSTEM INCLUDING THE SAME - According to one embodiment of the invention, there is provided a switching power supply device including a rectifying circuit and a switching operation conversion circuit. The rectifying circuit receives a phase-controlled alternating voltage to rectify to a direct voltage. The switching operation conversion circuit starts up by being applied with the direct voltage, and includes a normally on type switching element and an off driving circuit. The normally on type switching element passes an input current, and the off driving circuit turns off the switching element when the input current reaches a prescribed value. The switching operation conversion circuit converts the direct voltage to an output voltage different from the direct voltage by repeating a switching operation of turning on and off the switching element. | 03-22-2012 |
20120248999 | SWITCHING POWER-SUPPLY DEVICE AND LUMINAIRE - According to one embodiment, a switching power-supply device includes a switching element, a constant current element, a rectifying element, first and second inductors, and a constant voltage circuit. The switching element supplies, when the switching element is on, a power-supply voltage of a direct-current power supply to and feeds an electric current to the first inductor. The constant current element is connected to the switching element in series and turns off the switching element when the electric current of the switching element exceeds a predetermined current value. The rectifying element is connected to any one of the switching element and the constant current element in series. The second inductor is magnetically coupled to the first inductor and supplies induced potential to a control terminal of the switching element. The constant voltage circuit applies control potential to a control terminal of the constant current element. | 10-04-2012 |
20120249007 | SWITCHING POWER SUPPLY DEVICE AND LIGHTING APPARATUS - According to one embodiment, a switching power supply device includes a direct-current power supply and a switching operation conversion circuit. The switching operation conversion circuit is connected to the direct-current power supply, and includes an inductor, a switching element, a diode, a gate drive circuit, an input end and an output end. The switching element allows an increasing current to flow to the inductor from the direct-current power supply at an on time of the switching element. The diode allows a decreasing current to flow to the inductor at an off time of the switching element. The gate drive circuit controls a gate voltage of the switching element to turns off the switching element when the increasing current reaches a saturated state relative to a source-drain voltage of the switching element. The input end is connected to the direct-current power supply. The output end is connected with a load. | 10-04-2012 |
20130002160 | Switching Power Supply and Luminaire - A switching power supply includes a first switching element, a rectifying element, a first inductor and a second inductor. The first switching element supplies a power supply voltage to the first inductor and al lows a current to flow when the first switching element is on. The rectifying element is connected in series to the first switching element, and allows a current of the first inductor to flow when the first switching element is turned off. The second inductor is electromagnetically coupled to the first inductor, a potential to turn on the first switching element is induced when the current of the first inductor increases, and a potential to turn off the first switching element is induced when the current of the first inductor decreases. The induced potential is supplied to a control terminal of the first switching element. The rectifying element includes a diode and a second switching element. | 01-03-2013 |
20130069548 | Switching Power Supply, Luminaire, and Control Method for the Luminaire - A switching power supply includes a switching element, a constant current element, a rectifying element, a first inductor, a second inductor, and a control circuit. If the switching element is on, the switching element supplies a power supply voltage to the first inductor and feeds an electric current. The constant current element turns off the switching element if the electric current of the switching element exceeds a predetermined upper limit. The rectifying element feeds the electric current of the first inductor if the switching element is turned off. The second inductor supplies the induced potential to a control terminal of the switching element. The control circuit supplies a pulse-like potential to a control terminal of the constant current element and outputs if an average of the potential is lower than a lower limit. | 03-21-2013 |
20130069551 | Switching Power Supply, Luminaire, and Control Method for the Luminaire - A switching power supply includes a transformer, a resonant capacitor, a pair of switching elements, an inductor, and a rectifying element. The transformer includes a first winding, a second winding, and a third winding. The resonant capacitor is connected to both ends of the first winding. The switching elements are normally-on elements and alternately turned off according to a voltage induced in the third winding. Each of the switching elements includes a first main terminal, a second main terminal, and a control terminal. The inductor supplies a direct-current power supply voltage between the middle point of the first winding and the each first main terminal of the switching elements. The rectifying element rectify a voltage induced in the second winding. | 03-21-2013 |
20130083561 | INTEGRATED SWITCHING POWER SUPPLY DEVICE AND ELECTRIC APPARATUS - An integrated switching power supply device includes a series-connected body, a driving control element, and external terminals. In the series-connected body, a switching element, a constant current element, and a diode are connected in series. The driving control element controls to drive the constant current element. The external terminals include first to seventh external terminals. The first and second external terminals are connected to main terminals of elements of the series-connected body. The third external terminal is connected to a connection point of main terminals of the switching element or the constant current element and a main terminal of the diode. The fourth external terminal is connected to a control terminal of the switching element. The fifth external terminal supplies electric power to the driving control element. The sixth external terminal inputs reference potential. The seventh external terminal inputs a signal to the driving control element. | 04-04-2013 |
20130113387 | Power Supply For Lighting and Luminaire - According to one embodiment, a power supply for lighting includes an output element. The output element is connected between a power supply and a lighting load, and configured to be capable of being switched to a switching operation repeating an ON state and an OFF state and an ON continuation operation continuing the ON state. | 05-09-2013 |
20130119860 | Switching Power Supply Apparatus And Luminaire - A switching power supply apparatus according to an embodiment includes a switching element, an inductor, a drive circuit, a mounting substrate, and an insulating substrate. The switching element is connected between a power supply and a lighting load. The inductor is connected in series to the switching element. The drive circuit controls the switching element, converts a voltage supplied from the power supply, and is mounted on the mounting substrate. The insulating substrate is thermally connected to the switching element, and has thermal conductivity higher than the mounting substrate. | 05-16-2013 |
20130119878 | Lighting Power Source and Luminaire - A lighting power source according to an embodiment includes a rectification circuit, a smoothing capacitor, a waveform shaping circuit, and a DC-DC converter. The rectification circuit rectifies an AC voltage input thereto. | 05-16-2013 |
20130119879 | Lighting Power Source and Luminaire - A lighting power source according to an embodiment includes a rectifying circuit, a smoothing capacitor, a reference voltage generating circuit, and a DC-DC converter. The rectifying circuit rectifies an AD voltage input thereto. The smoothing capacitor smoothes an output from the rectifying circuit. The reference voltage generating circuit generates a reference voltage on the basis of at least any one of an output voltage of the rectifying circuit and a voltage from the smoothing capacitor. The DC-DC converter includes an output element and a constant current element, and converts the voltage of the smoothing capacitor. The output element receives a supply of a voltage of the smoothing capacitor, oscillates by performing a switching operation which repeats an ON state and an OFF state when the reference voltage is relatively high, and continues the ON state when the reference voltage is relatively low. | 05-16-2013 |
20130170260 | POWER FACTOR CONTROL CIRCUIT AND POWER SOURCE DEVICE - A power factor control circuit of an embodiment includes an inductor, a switching element, a constant current element, a feedback coil, and a control circuit. The switching element is connected to one end of the inductor in series, performs a switching operation of repeating an on-state and an off-state when an input voltage is relatively high, continues the on-state when the input voltage is relatively low, and causes an input current to flow through the inductor. The constant current element is connected to the switching element in series and limits the current of the switching element. The feedback coil is magnetically coupled to the inductor, supplies a voltage to a control terminal of the switching element, and controls the switching element. The control circuit controls a constant current value of the constant current element depending on the input voltage. | 07-04-2013 |
20130234616 | POWER SUPPLY FOR LIGHTING AND LUMINAIRE - According to one embodiment, a power supply for lighting includes a rectifying circuit, a smoothing capacitor, and a current control circuit. The rectifying circuit rectifies a phase-controlled alternating-current voltage supplied to between a pair of input terminals. The smoothing capacitor is connected to a high-potential terminal and a low-potential terminal of the rectifying circuit. A first electric current flows to the current control circuit in a period when an absolute value of the alternating-current voltage is lower than a specified value. After a second electric current larger than the first electric current flows when the absolute value of the alternating-current voltage increases to be equal to or larger than the specified value, the current control circuit is shut off to reduce a current value to be smaller than the second electric current until the absolute value of the alternating-current voltage decreases to be lower than the specified value. | 09-12-2013 |
20140028209 | INTERFACE CIRCUIT AND INTERFACE METHOD - Disclosed is an interface circuit including a rectifier circuit, a detection circuit, a first circuit, and a second circuit. The rectifier circuit rectifies an AC voltage input between a pair of input terminals. The detection circuit detects the AC voltage and outputs the result as a detection voltage. The first circuit is controlled to be turned on or off on the basis of an input first control signal, to cause a first current to flow between the input terminals in an on state and to cut off the first current in an off state. The second circuit is controlled to be turned on or off on the basis of an input second control signal, to allow a second current greater than the first current to flow between the input terminals in an on state and to cut off the second current in an off state. | 01-30-2014 |