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| 20120044721 | Series resonant converter using power switches with relatively low rated voltages and currents - The present invention is to provide a series resonant converter, which includes a transformer, two power switches connected to primary side of the transformer, a resonant control chip having two control pins connected to gates of the two power switches respectively, a resonant capacitor having one end connected to one end of the primary side and the other end connected to source of one power switch, a resonant inductor having one end connected to the other end of the primary side and the other end connected to a line between the two power switches, and at least one bypass resistor connected in parallel to the resonant capacitor, so as to allow voltage of the resonant capacitor to be rapidly released to ground when the converter is turned off and effectively lower inrush current of the resonant capacitor generated at an instant when the converter is turned on from off. | 02-23-2012 |
| 20130294113 | LLC RESONANT POWER CONVERTER WITH CURRENT-CIRCULATING CIRCUIT FOR ENABLING LIGHT-LOAD REGULATION - The present invention is to provide a power converter, which includes a half-bridge circuit parallel-connected to an input voltage and having two series-connected power switches, an LLC resonant circuit formed by a resonant inductor, magnetic inductance of a primary winding and a resonant capacitor, a current-circulating circuit parallel-connected to the half-bridge circuit and having two series-connected rectifiers, and a full-wave rectification circuit connected to a secondary winding for generating an output voltage across an output capacitor. The LLC resonant circuit is parallel-connected to one of the power switches, and the line between the two rectifiers is cross-connected to the line between the resonant inductor and the primary winding. Thus, since the current-circulating circuit is able to guide current through the resonant inductor into circulation in switching moment of the power switches, parasitic capacitance of the primary winding is prevented from being overcharged by the current through the resonant inductor accordingly. | 11-07-2013 |
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| 20120139422 | DRIVING CIRCUIT FOR POWERING LED LIGHT SOURCES - Embodiments of the invention provided a driving circuit for powering a light-emitting diode (LED) light source. The driving circuit includes a rectifier, a s filter capacitor, and a control circuit. The rectifier converts an AC voltage from an AC power source to a rectified AC voltage. The filter capacitor coupled to the rectifier filters the rectified AC voltage to provide a DC voltage. The control circuit controls power supplied to the LED light source. The control circuit enables a discharging current periodically to discharge the filter capacitor if a switch coupled between an AC power source and a rectifier is turned off and disables the discharging current if the control circuit determines that the switch is turned on. | 06-07-2012 |
| 20120139433 | CIRCUITS AND METHODS FOR DRIVING LIGHT SOURCES - A circuit for driving a light-emitting diode (LED) light source includes a converter, a saw-tooth signal generator, and a controller. The converter includes a switch which is controlled by a driving signal. The converter provides a sense signal indicating the current through said LED light source. The saw-tooth signal generator generates a saw-tooth signal based on the driving signal. The controller generates the driving signal based on signals including the saw-tooth signal and the first sense signal to adjust the current through the LED light source to a target level and to correct a power factor of the driving circuit by controlling an average current of the input current to be substantially in phase with said input voltage. | 06-07-2012 |
| 20120169243 | CIRCUITS AND METHODS FOR CONTROLLING DIMMING OF A LIGHT SOURCE - A controller that monitors a rectified voltage and detects whether the rectified voltage comes from a TRIAC dimmer or an on/off switch dimmer is disclosed. The controller controls dimming of a light source according to the rectified voltage if the rectified voltage comes from the TRIAC dimmer. The controller controls dimming of the light source according to an operation of the on/off switch dimmer if the rectified voltage comes from the on/off switch dimmer. | 07-05-2012 |
| 20120268023 | CIRCUITS AND METHODS FOR DRIVING LIGHT SOURCES - A driving circuit for driving a light-emitting diode (LED) light source includes a buck-boost converter and a controller. The buck-boost converter receives an input voltage and an input current and powers the LED light source, and comprises a switch controlled by a driving signal. The controller receives a first signal indicating a current through the LED light source, and generates the driving signal based on the first signal to control the switch and to adjust the current through the LED light source. The buck-boost converter further comprises a current sensor which provides a second signal indicating an instant current flowing through the buck-boost converter, wherein the first signal is derived from the second signal, and wherein a reference ground of the controller is different from a ground of the driving circuit. | 10-25-2012 |
| 20130069546 | CIRCUITS AND METHODS FOR DRIVING LIGHT SOURCES - A controller controls power to a light source. The light source receives a rectified AC voltage and includes a first plurality of LEDs and a second plurality of LEDs. The controller regulates a current flowing through the first plurality of LEDs to a first predetermined level when the rectified AC voltage is within a first predetermined range. The second plurality of LEDs remain off when the rectified AC voltage is within the first predetermined range. | 03-21-2013 |
| 20130193877 | CIRCUITS AND METHODS FOR DRIVING LIGHT SOURCES - A dimming controller can operate in a first mode or a second mode to control dimming of a light-emitting diode (LED) light source. The dimming controller can include a voltage control terminal and a current control terminal. The voltage control terminal provides a pulse signal when the dimming controller operates in the first mode to operate a control switch in either a first state or a second state. A first current flowing through the LED light source increases when the control switch is in the first state and decreases when the control switch is in the second state. The voltage control terminal provides a control signal to the control switch to cut off the first current when the dimming controller operates in the second mode. The current control terminal conducts a second current through the LED light source when the dimming controller operates in the second mode. | 08-01-2013 |
| 20140091723 | CIRCUITS AND METHODS FOR DRIVING LIGHT SOURCES - A driving circuit for driving a light source having an adjustable color temperature is provided. The driving circuit includes a power converter, coupled between a power source and the light source and operable for receiving power from the power source and for providing a regulated power to the light source; and a color temperature controller, coupled to the power converter and operable for receiving a switch monitoring signal indicative of an operation of a power switch coupled between the power source and the power converter, and for adjusting the color temperature of the light source based on the switch monitoring signal. | 04-03-2014 |
| 20140152187 | CIRCUITS AND METHODS FOR DRIVING A LIGHT SOURCE - A circuit includes a bridge circuit, a converter, and a controller. The bridge circuit receives power from first and second power lines of a switch and generates a rectified voltage. The switch is capable of operating in a first state in which the switch conducts power to the first power line but not the second power line, a second state in which the switch conducts power to the second power line but not the first power line, and a third state in which the switch conducts power to both the first and second power lines. The converter converts the rectified voltage to an output voltage to drive a light source, and controls a current through the light source according to a driving signal. The controller monitors the operation state of the switch and generates the driving signal based on the operation state to control brightness/dimming of the light source. | 06-05-2014 |
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| 20130309374 | Method of Heating Food - A method of heating food is provided, which employs a cooker provided with a control program and a reader to identify a food package attached with a coded object which embodies the parameters associated with the food package, the parameters including temperature and time, whereby the contents of the parameters of the coded object can be read by the reader and compared by the control program so that the control program can issue commands to conduct a heating procedure according to the contents of the parameters of the coded object. Thus, the food package can be heated or cooked more easily, conveniently, safely, and economically, and the disadvantages resulted from incorrectly manual operations can be avoided. | 11-21-2013 |
| 20150118368 | METHOD FOR EXECUTING HEATING ACCORDING PROPERTY OF FOOD - A method for executing heating according to property of food is provided, in which a cooking appliance is provided with a reading device, a displaying screen, and a printing device. The cooking appliance forms a heating zone, which receives sensors and an ultrasonic scanner arranged therein. An object-to-be-heated is placed in the heating zone and the ultrasonic scanner scans and displays an outside configuration of the object on the displaying screen to allow a user to apply an automatic process or manual selection of a temperature difference between a single point or an average of multiple points for more than one or two points and another point for carrying out a heating operation. The sensors detect a temperature difference between a surface temperature and an interior temperature of the object in order to ensure that the temperature difference is kept constant. | 04-30-2015 |
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| 20110204040 | Temperature-control circuit of a heating line and a temperature-control method thereof - A temperature-control circuit of a heating line and a temperature-control method thereof are disclosed. The method comprises steps of: outputting a forward square-wave signal by a first forward square-wave signal generation circuit; outputting a reverse square-wave signal by a reverse square-wave signal generation circuit; and outputting a varied forward square-wave signal by a second forward square-wave signal generation circuit. Above square-wave signal generation circuits are respectively connected with an AND gate. When the input square-wave signals are simultaneously logic high, a switch is triggered by a trigger circuit to heat the heating wire. When the heating wire's temperature increases, the forward square-wave signal output by the second forward square-wave signal generation circuit is changed so as to render these input square-wave signals non-simultaneously logic high and not to trigger the switch in order to stop the heating wire's heating and keep the heating wire at a certain temperature range. | 08-25-2011 |
| 20120281973 | TEMPERATURE-CONTROL CIRCUIT OF A HEATING LINE AND A TEMPERATURE-CONTROL METHOD THEREOF - A temperature-control circuit of a heating line and a temperature-control method thereof are disclosed. The method comprises steps of: outputting a forward square-wave signal by a first forward square-wave signal generation circuit; outputting a reverse square-wave signal by a reverse square-wave signal generation circuit; and outputting a varied forward square-wave signal by a second forward square-wave signal generation circuit. Above square-wave signal generation circuits are respectively connected with an AND gate. When the input square-wave signals are simultaneously logic high, a switch is triggered by a trigger circuit to heat the heating wire. When the heating wire's temperature increases, the forward square-wave signal output by the second forward square-wave signal generation circuit is changed so as to render these input square-wave signals non-simultaneously logic high and not to trigger the switch in order to stop the heating wire's heating and keep the heating wire at a certain temperature range. | 11-08-2012 |
| 20120299689 | SAFETY CONTROL STRUCTURE FOR HEATER WIRE - A safety control structure for heater wire comprises a switch, a first heating wire, a second heating wire, and an over-current protection element, which are sequentially connected in series connection. An insulation and fusible layer is interposed between the first heating wire and the second heating wire. Accordingly, under normal condition, the switch is triggered by triggering the circuit, so as to have the first heating wire and the second heating wire then be heated up within a preset temperature range. When the first heating wire and the second heating wire produce exceptionally high temperatures to fuse the insulation and fusible layer, the current is increased instantaneously because the first heating wire and the second heating wire are short-circuited. Therefore, the circuit is interrupted by the over-current protection element to show a broken circuit status in order to stop heating up. | 11-29-2012 |
| 20130168380 | HEATING STRUCTURE AND METHOD FOR PREVENTING THE OVERHEAT OF HEATING LINE - A heating structure and method for preventing overheat of a heating line, where the heating line includes a sensing line and a heating wire in parallel connection. The sensing line has one end connected with a processor. The heating wire has one end connected sequentially with an over-current protection element and an alternating current power's one polarity and has another end connected sequentially with a switch and the alternating current power's another polarity. The processor controls the trigger circuit to trigger the switch to be in conducting condition. Thereby, under normal condition, the heating of the heating wire is in half-wave form. When abnormal signals from the sensing line are detected by the processor, the switch is controlled to let the alternating current pass through the heating wire in full-wave form to increase the current instantaneously and disconnect the over-current protection element to stop the heating. | 07-04-2013 |
| 20130186882 | TEMPERATURE CONTROL METHOD FOR A HEATING LINE - A temperature control method for a heating line comprises steps of: inputting continuous and changing pulse wave signals produced by the heating of a heating wire and reference pulse wave signals into a And-gate; utilizing the And-gate to obtain continuous synthesized pulse wave signals each of which has a pulse width that spans from a time point in which a logic high state begins to a time point in which the logic high state terminates; and controlling the control circuit to stop the heating of the heating wire when the time point in which the logic high state begins moves in relative to the time point in which the logic high state terminates and the pulse width of the synthesized pulse wave signals reaches a value preset by the processor, so as to keep the temperature within a preset and prevent overheat. | 07-25-2013 |
| 20130264329 | Temperature Control Circut for Two Heating Devices - A temperature control circuit for two heating devices respectively provided with a heater and a sensing wire. The sensing wires' ends are respectively connected to a diode. The two diodes' polarity is opposite to that of the sensing wires' connecting ends. Another ends of the sensing wires are connected to a capacitor to form a resistor-capacitor circuit. The heater wires are connected to a diode respectively and then a bi-directional thyristor. The two diodes' polarity is opposite to that of the heater wires' connecting ends. Thereby, the heater wires can be heated up respectively by the positive and negative half-periods of alternating current. When phase shifts occur because of the heater wires' temperature change, the sensing wires can control the bi-directional thyristor via a controller so that the positive or negative half-period are not triggered. Therefore, the heater wires' heating temperatures can be controlled individually. | 10-10-2013 |
| 20130296979 | COMBINATIONAL HOT COMPRESS DEVICE - A combinational hot compress device comprises a first and second hot compress pads and a first and second positioning elements are respectively disposed around the two hot compress pads. A first and second areas are adjacently disposed on top of the first hot compress pad and a first heating device is disposed in the first area. A third and fourth areas are adjacently disposed on top of the second hot compress pad and a second heating device is disposed in the fourth area. When the first or the second hot compress pad is folded in half, the two halves thereof are coupled by the first or the second positioning element, so that the first and the second areas or the third and the fourth areas are overlapped with each other. Thereby, the two hot compress pads are formed which can be used independently. | 11-07-2013 |
