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| Number | Title | Issue Date |
| 8102683 | Phase angle measurement of a dimming circuit for a switching power supply An example controller for a switched mode power supply includes a zero-crossing detector, a feedback reference circuit, and a drive signal generator. The zero-crossing detector is coupled to generate a zero-crossing signal representative of a length of time that a z... | 01/24/2012 |
| 8059432 | PWM controller having drive control with input voltage sensing and method therefor In one embodiment, a PWM controller includes a circuit operably coupled to inhibit a drive signal responsively to a bulk input voltage remaining at a low value for a time interval and to re-enable the drive signal subsequently to the time interval responsively to th... | 11/15/2011 |
| 8023295 | Direct current (DC) to alternating current (AC) generation In one embodiment, a power converter system comprises an input terminal operable to connect to a DC power source and an output terminal at which an output voltage can be provided. An active clamped forward converter is operable to provide forward power flow from the... | 09/20/2011 |
| 7869235 | Flyback converter having an active snubber A flyback converter having an active snubber includes a transformer to receive input power. The transformer has a primary winding at a first side. The active snubber is coupled in parallel with two ends of the primary winding and has a first circumferential circuit ... | 01/11/2011 |
| 7787269 | Switching power supply device The present invention provides a switching power supply device including a switching element, a control circuit controlling the switching element, a transformer having an auxiliary winding, a potential clamp circuit connected to one of outputs of the transformer, a ... | 08/31/2010 |
| 7782638 | Switching power supply device, semiconductor device, and control method A plurality of arrangements for detecting an overload of energy supplied to an output part enables selecting latch-off or auto-recovery overload protection by the operation of a switching device. When the drain current peak of the switching device exceeds a predeter... | 08/24/2010 |
| 7773394 | Digital latch control circuit for over-voltage protection and power converter using the control circuit An AC/DC power supply with over-voltage protection includes a voltage converting circuit and a digital latch control circuit. The voltage converting circuit has a first-side winding, a second-side winding, and an auxiliary winding for providing a supply voltage acco... | 08/10/2010 |
| 7697309 | Overpower-protection circuit and power supply apparatus having the same The present invention provides an overpower-protection circuit and a power supply apparatus having the same. The power supply apparatus comprises a rectifier, a transformer and an overpower-protection circuit The overpower-protection circuit comprises a converter ha... | 04/13/2010 |
| 7633777 | Active peak voltage-limiting clamp circuit The present invention discloses an active peak voltage-limiting clamp circuit, which comprises a primary switch unit and a secondary switch unit that are used to control the coil current of a transformer, wherein a signal acquisition unit, a zero-point decision unit... | 12/15/2009 |
| 7633776 | DC-DC converter for overvoltage protection A DC-DC converter for overvoltage protection is provided with a primary control circuit 12 which comprises an impedance controller 31 and a protective circuit 41 for ceasing operation of primary control circuit 12 when power source voltag... | 12/15/2009 |
| 7359221 | Power supply for use in an electronic energy meter A three-phase electronic electricity meter that includes a power supply circuit operable to create a constant voltage output when receiving a variable voltage input. The power supply circuit of the electricity meter receives a three-phase line voltage and converts t... | 04/15/2008 |
| 7355867 | Power supply for an electric meter having a high-voltage regulator that limits the voltage applied to certain components below the normal operating input voltage Disclosed is an invention relating to a power supply for use in an apparatus for measuring electrical energy, comprising, in one embodiment, a first switching device, a device for storing electrical charge in electrical connection with the first switching device, a ... | 04/08/2008 |
| 7355870 | Switching mode power supply and method for outputting voltage therefrom A switching mode power supply and a method for outputting voltage therefrom are provided, where a transformer receives rectified alternating current (AC) voltage and transforms a voltage value or a current value, a switching transistor is connected to one end of a f... | 04/08/2008 |
| 7339805 | Power supply having voltage blocking clamp A power supply comprises a rectifier, a transformer, a switching member, a controller and a voltage blocking clamp. A power supply can receive an alternating current (AC) input voltage having any magnitude within a wide range of AC input voltage magnitudes and can p... | 03/04/2008 |
| 7310251 | Control circuit having two-level under voltage lockout threshold to improve the protection of power supply The invention presents a switching power control circuit including two levels of under voltage lockout to improve the protection of the power supply. An input terminal of control circuit is connected to a supplied capacitor to supply the power of the control circuit... | 12/18/2007 |
| 7304870 | Power converter A power converter comprises an inductor (L) and a main switch (M1) having a main current path, the inductor (L) and the main current path are arranged in series to receive a DC-input voltage (VIN). A control circuit (CC) controls on-periods (Ton) and/or off-p... | 12/04/2007 |
| 7272019 | Switching power supply apparatus To provide a switching power supply apparatus which can achieve the followings simultaneously in high levels: the voltage waveform capable of reducing switching noise to the least is in a sine-waveform; capable of providing an output of stable voltage without a cont... | 09/18/2007 |
| 7239494 | System and method to mitigate voltage fluctuations A system and method can mitigate voltage fluctuations. According to one embodiment, a delay system provides a delayed version of a first reference signal as a function of a supply voltage. A comparator provides a control signal for controlling a protection device ba... | 07/03/2007 |
| 7200016 | Video cassette recorder and RCC type switching power supply An error detection circuit includes: a Zener diode having a cathode connected through a resistor to a second DC output with a higher voltage than that of a first DC output; a voltage divider circuit; and a PNP transistor having an emitter connected to the first DC o... | 04/03/2007 |
| 7187564 | Switching power supply unit A switching power source apparatus has a series circuit connected to both ends of a DC power source Vdc1 and having a reactor L3, a primary winding 5a of a transformer T, and a switch Q1, a series circuit connected to both ends of ... | 03/06/2007 |
| 7133300 | Over-voltage protection circuit for power converter The present invention proposes an over-voltage protection apparatus for a power converter. The over-voltage protection apparatus has an oscillator outputting a clock signal. Simultaneously, by comparing a sense signal with a threshold signal, an over-voltage compara... | 11/07/2006 |
| 7130201 | Power supply device for outputting stable programmable power supply The present invention discloses a power supply device for outputting a stable programmable power supply, which comprises a transformer disposed at a DC output end of the power supply device, and a clamp circuit connected to a secondary current of the transformer. Si... | 10/31/2006 |
| 7106602 | Switching-bursting method and apparatus for reducing standby power and improving load regulation in a DC—DC converter A circuit and corresponding method for reducing standby power and improving no-load to full-load regulation for ringing choke converters by maintaining a reduced duty cycle, with longer off time at no-load, while maintaining the output voltage swing closer to the fu... | 09/12/2006 |
| 7061190 | Circuit arrangement and operating device for operating lamps The invention relates to circuit arrangements for operating lamps and to operating devices which contain such circuit arrangements. A first stage of a circuit arrangement according to the invention comprises a SEPIC known from the literature. The SEPIC provides a DC... | 06/13/2006 |
| 7050278 | Motor controller incorporating an electronic circuit for protection against inrush currents Inrush currents in the dc intermediate circuit of a motor controller necessitate the incorporation of protection circuits. These circuits usually take the form of a resistor inserted in series with the intermediate circuit, and the resistor is short-circuited after ... | 05/23/2006 |
| 7023713 | Voltage overshoot reduction circuits Feedback circuits capable of preventing output voltage overshoot in closed-loop DC regulated power supplies are presented. The circuits employ hysteresis at the input of an operational amplifier to improve the response time of the feedback circuits to a rising outpu... | 04/04/2006 |
| 7019991 | Rectifying circuit In a rectifying circuit, a rectifying diode is configured to rectify a first AC voltage to output a first DC voltage. A protection diode circuit has constant reverse voltage diodes and electrically connected to the rectifying diode in parallel thereto. The constant ... | 03/28/2006 |
| 6975523 | Power supply capable of protecting electric device circuit A power supply protecting the electric device circuit when over-voltage is applied, is provided. The power supply has a rectifying unit rectifying AC power externally supplied, into first and second DC power and outputting the first and the second DC power; a main p... | 12/13/2005 |
| 6975521 | Switching power supply apparatus The present invention is directed to a switching power supply apparatus (100) adapted for controlling switching operation of a switching FET (125) which carries out switching of rectified and smoothed output of a primary side rectifying/smoothing circu... | 12/13/2005 |
| 6972971 | Pulse width modulation signal generator and switching mode power supply including the same A switching mode power supply includes a rectifier configured to convert AC power to a first DC power, an output unit configured to convert the first DC power to a second DC power under the control of a first switch, and a pulse width modulation generator coupled to... | 12/06/2005 |
| 6959258 | Methods and structure for IC temperature self-monitoring Methods and systems are provided for thermal self-monitoring of integrated circuits. Temperature is sensed, digitized, encoded, and compared to one or more threshold values by circuits added within an integrated circuit. A signal produced by a thermal diode within a... | 10/25/2005 |
| 6950319 | AC/DC flyback converter A single-stage input-current-shaping (S2ICS) flyback converter achieves substantially reduced conduction losses in the primary side of the S2ICS flyback converter by connecting a bypass diode between the positive terminal of a full-bridge recti... | 09/27/2005 |
| 6947299 | Method and apparatus for dissipative clamping of an electrical circuit Dissipative clamping apparatuses and methods for electrical circuits. In one aspect of the invention, In one aspect of the invention, a method includes switching a power supply input on an energy transfer element, regulating a power supply output by switching the po... | 09/20/2005 |
| 6940416 | Low voltage testing and illuminating device This invention relates to a limited range low voltage testing, regulating, and indicating device comprising a detector and low voltage measurer of magnitude in a switch-regulated power supply circuit wherein indicator LEDs are operated directly from a power supply w... | 09/06/2005 |
| 6922022 | LED switching arrangement for enhancing electromagnetic interference The invention relates to a switching arrangement for operating at least one LED, which switching arrangement is provided with input terminals (1, 2) for connecting a supply source, —output terminals (3, 4) for connecting the LED to be operated, —a ... | 07/26/2005 |
| 6882548 | Auxiliary active clamp circuit, a method of clamping a voltage of a rectifier switch and a power converter employing the circuit or method The present invention is directed to an auxiliary active clamp circuit and a method of clamping a voltage of a rectifier switch associated with a power converter. The power converter includes a main active clamp circuit associated with a main power switch coupled to... | 04/19/2005 |
| 6856523 | Level shifted drive for clamp device A DC/DC converter device is provided that employs a clamp device to limit the peak voltage of a main power switch coupled to a primary winding of a transformer. The clamp device is driven employing a driver circuit coupled to a level shifter circuit. The level shift... | 02/15/2005 |
| 6853565 | Voltage overshoot reduction circuits Feedback circuits capable of preventing output voltage overshoot in closed-loop DC regulated power supplies are presented. The circuits employ hysteresis at the input of an operational amplifier to improve the response time of the feedback circuits to a rising outpu... | 02/08/2005 |
| 6822882 | Gate driver with a DC offset bias circuit and a power converter employing the same A gate driver and a method of driving a switch for use with a power converter having a main active clamp circuit associated with a main power switch coupled to a primary winding of a transformer and a rectifier switch coupled to a secondary winding of the transforme... | 11/23/2004 |
| 6813171 | Dissipative clamping of an electrical circuit with a clamp voltage varied in response to an input voltage Dissipative clamping apparatuses and methods for electrical circuits. In one aspect of the invention, In one aspect of the invention, a method includes switching a power supply input on an energy transfer element, regulating a power supply output by switching the po... | 11/02/2004 |
