Class / Patent application number | Description | Number of patent applications / Date published |
363018000 | Single-ended, self-oscillating type | 25 |
20080198633 | Method and system for operating a power converter - A method and system for operating a power converter having an electrical component and a switch coupled to a voltage source are provided. A signal is received that is representative of a desired current flow through the electrical component. A signal is generated that is representative of a difference between the desired current flow and an actual current flow through the electrical component. A duty cycle for the switch is calculated based on the signal representative of the difference and a voltage generated by the voltage source. | 08-21-2008 |
20090185397 | SECONDARY-SIDE AMPLIFIER WITH SOFT START - An isolated switching regulator has a closed-loop soft-start feature that allows tighter regulation of the output voltage and eliminates or reduces overshoot. It also has an optional reset feature which will resoft-start the regulator during recovery from a fault on the output voltage. | 07-23-2009 |
20090244930 | ELECTRICAL DC-DC POWER CONVERTER WITH MAGNETICALLY COUPLED SWITCH CONTROL CIRCUIT - Power converter with a controllable first switch and a diode and a controllable second switch and a second diode, a transformer with a primary winding and a secondary winding, of which the secondary winding forms at least part of a control circuit for the first switch. As a result of an alternating voltage across the primary winding, a synchronously alternating voltage is induced in the secondary winding, which can be used to control the first switch essentially synchronously with the second switch. | 10-01-2009 |
20090262557 | BI-DIRECTIONAL DC-DC CONVERTER - A bi-directional DC-DC converter includes a first series circuit connected to ends of a first DC power source and including a first winding of a first reactor and a first switch; a second series circuit connected to ends of the first switch and including a second winding of the first reactor, a second reactor, a second switch, a third switch, and a second DC power source; a third series circuit connected to the ends of the first switch and including a fourth switch and the second DC power source; and a control circuit configured to turn on/off the switches and thereby carry out step-up and step-down operations between the first and second DC power sources. | 10-22-2009 |
20100073965 | Self-Oscillating DC-DC Converter and Method Therefor - A self-oscillating DC/DC converter comprising: a first and a second input connection for application of an input DC voltage; a first and a second bipolar transistor, wherein each bipolar transistor has a control electrode, a reference electrode and a working electrode; at least one first coupling capacitor; wherein a first switching junction is formed by the junction of the working electrode and the reference electrode of the first bipolar transistor, and a second switching junction is formed by the junction of the working electrode and the reference electrode of the second bipolar transistor, wherein the first and the second switching junctions are connected in series with respect to the input DC voltage; a rectifier, with an output that is coupled to a first and a second output connection in order to provide an output DC voltage; a transformer, which has a primary winding, a secondary winding and at least one control winding; wherein the primary winding is coupled between a galvanic connection of the first and the second switching junction and the at least one coupling capacitor; wherein the secondary winding is coupled to the input of the rectifier; wherein each bipolar transistor has an associated control winding which is coupled to the control electrode of the respective bipolar transistor and at least one timer, which is coupled between the respectively associated control winding and the respective control electrode. | 03-25-2010 |
20100208498 | Ultra-low voltage boost circuit - A circuit for boosting the voltage from a very low level voltage source to a higher level voltage output utilizing self-oscillation. | 08-19-2010 |
20140268900 | POWER SUPPLY WITH CONTINUOUS SPREAD-SPECTRUM SWITCHING SIGNAL - A switched-mode power supply with reduced electromagnetic interference (EMI) is described. This switched-mode power supply includes a modulation circuit that continuously frequency modulates a control signal over a bandwidth associated with a spread-spectrum modulation signal. By frequency modulating the control signal in the switched-mode power supply, spectral content associated with a modulated switching signal is spread evenly over the bandwidth, thereby reducing the EMI. | 09-18-2014 |
363019000 | With automatic control of the magnitude of output voltage or current | 18 |
20090073725 | Apparatus and method for regulating constant output voltage and current on primary side in a flyback converter - A voltage detector circuitry extracts a signal on primary side of a transformer in a flyback converter, which is proportional to the output voltage of the converter without voltage drop on the rectifier diode and leakage inductance effect on the transformer, and good output regulation is achieved without opto-coupler. To accurately detect the output voltage on the primary side, the knee point of the voltage on an auxiliary winding of the transformer is detected. A current limit proportional to the input voltage of the converter is produced from the voltage on an auxiliary winding for stabilizing the output current in constant current mode. | 03-19-2009 |
20090103334 | Switching-type power-supply unit and a method of switching in power-supply unit - A switching-type power-supply which enables the switching with little power loss and a method of switching the switching-type power-supply are provided. The switching-type power-supply unit includes a transformer with primary, secondary, winding and control windings, a switch which switches supply of a primary current from a dotted terminal to a non-dotted terminal through the primary winding, a rectifying diode connected the secondary winding, a monitoring signal generation circuit with a diode and a resistor, the diode between GND and a dotted terminal of the control winding, the resistor between GND and a non-dotted terminal of the control winding, the monitoring signal generation circuit generating a monitoring signal at the dotted terminal of the control winding, and a control unit with a zero-point detector and a controller. The zero-point detector monitoring the monitoring signal and supplying a detection signal to the controller. The controller determining on-timing of the switch based on the detection signal supplied from the zero-point detector. | 04-23-2009 |
20090190376 | VOLTAGE DETECTION DEVICE AND VOLTAGE DETECTION METHOD - A voltage detection device that is connected to a DC circuit to which a DC voltage is applied and that detects the DC voltage applied to the DC circuit comprises a voltage conversion means for outputting a first voltage that increases as the DC voltage increases and a second voltage that decreases as the DC voltage increases, an error detection means for detecting an error for the first voltage and the second voltage based upon the first voltage and the second voltage when the DC voltage is 0, and a voltage calculation means for correcting a difference between the first voltage and the second voltage outputted by the voltage conversion means based upon the error detected by the error detection means and calculating the DC voltage based upon the corrected difference between the first voltage and the second voltage. | 07-30-2009 |
20090284989 | FLYBACK SYSTEM POWER SOURCE APPARATUS - A flyback system power source apparatus, which applies a voltage intermittently to a primary winding of a transformer to perform voltage outputting onto a secondary winding side of the transformer, comprises: the transformer; a synchronously rectifying element for rectifying a current in a secondary winding of the transformer; and a synchronous rectification control circuit for detecting a voltage vibration caused in a terminal voltage of the secondary winding to perform operation control of the synchronously rectifying element on the basis of the detection. | 11-19-2009 |
20090290386 | Photocoupler and switching power supply circuit - A photocoupler for feeding back output voltage information on a secondary side of a switching power supply circuit through a light signal to control a switching operation on a primary side comprises: a light-emitting element for emitting a light signal flashing based on the output voltage information of the switching power supply circuit; a light-receiving control integrated circuit composed by integrating a light-receiving element composed of a photodiode for receiving the light signal, an amplifier circuit for amplifying an output signal of the light-receiving element, and a switching control circuit for controlling the switching operation of the switching power supply circuit, in one chip, wherein the light-emitting element and the light-receiving control integrated circuit are sealed in one package so that the light signal can be transmitted from the light-emitting element to the light-receiving element. | 11-26-2009 |
20090303752 | Switching Power Supply - A switching power supply includes an active device for pulling out a part of a control signal from a control terminal of the switching device in an RCC, and a control signal generation circuit that applies adjustment voltage as ON/OFF time control voltage to a control terminal of the active device. The active device pulls out the control signal so as to decrease or increase an OFF time of the switching device while fixing the ON time of the switching device when the adjustment voltage is decreased or increased in the active region of the active device, respectively. An element of a timing circuit in the RCC pulls out the control signal so as to increase or decrease an ON time of the switching device while fixing the OFF time of the switching device when the adjustment voltage is decreased or increased in the cut-off region of the active device, respectively. | 12-10-2009 |
20100110732 | TAIL CURRENT CONTROL OF ISOLATED CONVERTER AND APPARATUS THEREOF - An inventive isolated converter which exempts the auxiliary isolation devices with accurate voltage regulation is disclosed. The converter includes the primary side circuit with a primary controller controlling the on and off of the primary switch and a secondary side circuit with a secondary controller controlling the on and off of the secondary synchronous rectifier. The isolated converter uses the secondary controller to turn on the secondary synchronous rectifier after the secondary current decreases to zero to generate a negative tail current and turns off the secondary synchronous rectifier at a reference tail current peak value to generate a reflected negative current at the primary side circuit for turning on the primary switch. | 05-06-2010 |
20100220502 | ISOLATING SELF-OSCILLATION FLYBACK CONVERTER - An isolating self-oscillation flyback converter includes a coupling transformer T | 09-02-2010 |
20100296316 | PIEZOELECTRIC CONVERTER WITH PRIMARY REGULATION AND ASSOCIATED PIEZOELECTRIC TRANSFORMER - The present invention relates to voltage transformers, comprising multi-layer structures of piezoelectric ceramics, so-called piezoelectric transformers. The present invention further relates to switched mode power supplies, comprising such a piezoelectric transformer as part of a piezoelectric converter. The piezoelectric transformer according to the invention comprises a primary-side electrode arrangement ( | 11-25-2010 |
20110051463 | APPARATUS AND METHOD FOR STANDBY POWER REDUCTION OF A FLYBACK POWER CONVERTER - An apparatus and method for a flyback power converter reduce the standby output voltage of the flyback power converter by switching the reference voltage provided by a shunt regulator of the flyback power converter or the ratio of voltage divider resistors of the shunt regulator, to reduce the standby power consumption by an output feedback circuit of the flyback power converter, the shunt regulator, and the voltage divider resistors, and thereby the power loss of the flyback power converter in standby mode. | 03-03-2011 |
20120087154 | VOLTAGE SUPPLY DEVICE FOR A LOAD - A voltage supply device for a load, in particular for a network, has an energy store that can be connected to connection terminals and a voltage transformer with at least one electronic switch. A reverse polarity protection is in contact with the connection terminals and is designed to convert voltage delivered from the energy store into control voltage for active activation of the electronic switch when the polarity of the voltage is reversed. | 04-12-2012 |
20120230061 | SELF-EXCITED SWITCHING POWER SUPPLY CIRCUIT - There is provided a self-excited switching power supply circuit which shifts to continuous oscillating operation immediately after the self-excited switching power supply circuit is connected to an AC power supply and started and which does not cause start-up failure while using a start-up resistor of a high resistance value to maintain standby power consumption at a low level. A bypass charging circuit connected in series to a start-up resistor is connected between a high-voltage side terminal of a DC input power supply and the gate of an oscillation field effect transistor. A charging current flowing in the start-up resistor, and additionally, a charging current to charge a start-up capacitor through the bypass charging circuit flow in a transitional period during which the voltage of the DC input power supply increases. | 09-13-2012 |
20130094248 | Regulating Controller for Controlled Self-Oscillating Converters Using Bipolar Junction Transistors - A power converter controller and methods for its operation are provided that can control a self-oscillating power converter that uses a Bipolar Junction Transistor (BJT) as a switch by manipulating the current flowing in a control winding. The controller is able to determine the optimum time to remove a short circuit applied to the control winding, as well as being able to determine the optimum time to pass current through the control winding. The controller can further draw power from the power converter using the control winding. The controller is capable of maintaining the midpoint voltage of the power converter in the case that the converter has more than one switch. The controller estimates the output power of the converter without requiring a connection to the secondary side of the converter transformer. The controller further controls entry and exit into a low-power mode in which converter oscillations are suppressed. | 04-18-2013 |
20130294112 | Regulating Controller for Controlled Self-Oscillating Converters Using Bipolar Junction Transistors - A power converter controller and methods for its operation are provided that can control a self-oscillating power converter that uses a Bipolar Junction Transistor (BJT) as a switch by manipulating the current flowing in a control winding. The controller is able to determine the optimum time to remove a short circuit applied to the control winding, as well as being able to determine the optimum time to pass current through the control winding. The controller can further draw power from the power converter using the control winding. The controller is capable of maintaining the midpoint voltage of the power converter in the case that the converter has more than one switch. The controller estimates the output power of the converter without requiring a connection to the secondary side of the converter transformer. The controller further controls entry and exit into a low-power mode in which converter oscillations are suppressed. | 11-07-2013 |
20140177284 | Switching Power-Supply Apparatus - A switching power-supply apparatus includes: a control circuit that controls on-and-off switching of a switching element; a first rectifying-and-smoothing circuit that smoothes a voltage generated in a secondary winding; and a second rectifying-and-smoothing circuit that smoothes a voltage generated in a tertiary winding as a power supply voltage, a starting circuit that supplies: a first constant current to the control circuit when the power supply voltage is equal to or lower than a first threshold voltage, which is lower than a starting voltage of the control circuit, and is larger than the starting voltage of the control circuit, as a starting current; and a second constant current, which is greater than the first constant current, to the control circuit when the power supply voltage is larger than the first threshold voltage and is equal to or lower than the starting voltage, as the starting current. | 06-26-2014 |
20150070941 | Electrostatic Induction Conversion Device and DC-DC Converter - An electrostatic induction conversion device includes: an input-side electrostatic actuator that includes a first fixed electrode and a first movable electrode facing the first fixed electrode; and an output-side electrostatic actuator that includes a second movable electrode linked to the first movable electrode via a link mechanism member, which increases or decreases a displacement quantity representing an extent of displacement occurring at the first movable electrode, and a second fixed electrode facing the second movable electrode, wherein: a permanently charged layer is deposited on an electrode surface either on a movable electrode side or on a fixed electrode side, at the input-side electrostatic actuator and the output-side electrostatic actuator. | 03-12-2015 |
20160134186 | INTRODUCING JITTER TO A SWITCHING FREQUENCY BY WAY OF MODULATING CURRENT LIMIT - A controller for use in a power converter includes a switch controller coupled to a power switch coupled to an energy transfer element. The switch controller is coupled to receive a current sense signal representative of a drain current through the power switch. The switch controller is coupled to generate a drive signal to control switching of the power switch in response to the current sense signal and a modulated current limit signal to control a transfer of energy from an input to an output of the power converter. A current limit generator is coupled to generate a current limit signal. A jitter generator is coupled to generate a jitter signal. An arithmetic operator circuit is coupled to generate the modulated current limit signal in response to the current limit signal and the jitter signal. | 05-12-2016 |
20190149040 | INTRODUCING JITTER TO A SWITCHING FREQUENCY BY WAY OF MODULATING CURRENT LIMIT | 05-16-2019 |