Did You Know...
...that in 1800 ether was first used by partyers as a fun diversion? Sniffing the gas led to hilarious and raucous laughter as people watched each other become more and more intoxicated and silly. Several doctors independently realized the value ether would have to anesthetize surgery patients. Of those who claimed rights to the "discovery," none had a happy ending. One had a seizure and died defending his rights. Another spent his life in an asylum because he had been denied acclaim. A third became addicted to chloroform and, in a New York City jail, he soaked a cloth in the drug, severed an artery and bled to death.
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| Number | Title | Issue Date |
| 8169798 | Synchronous rectifier circuit and multi-output power supply device using the same A synchronous rectifier circuit and a multi-output power supply device using the same include a semiconductor switch to control a current flow of the synchronous rectifier circuit, and a switching controller to control the semiconductor switch according to a synchro... | 05/01/2012 |
| 8154888 | Offline synchronous rectifier circuit with turned-on arbiter and phase-lock for switching power converters A synchronous rectifier circuit of a switching power converter is provided and includes first and second power transistors and first and second diodes connected to a transformer and an output of the power converter for rectifying. An arbiter circuit generates a lock... | 04/10/2012 |
| 8064229 | Method of forming a series resonant switching power supply control circuit and structure therefor In one embodiment, a control circuit for a series resonant switching power supply control system is configured to disable a power switch of secondary side of the system in response to a polarity reversal of the voltage across a primary side winding of the system. | 11/22/2011 |
| 8031489 | Synchronous rectification circuit having burst mode controller and controlling method thereof The configuration of a synchronous rectification circuit and a controlling method thereof are provided. The proposed circuit includes a converter including a first switch and a first synchronous rectifier, and a burst mode controller including a logic process module... | 10/04/2011 |
| 8023290 | High efficiency power converter A power converter nearly losslessly delivers energy and recovers energy from capacitors associated with controlled rectifiers in a secondary winding circuit, each controlled rectifier having a parallel uncontrolled rectifier. First and second primary switches in ser... | 09/20/2011 |
| 8004862 | Offline synchronous rectifying circuit with current transformer for soft switching power converters A synchronous rectifying circuit of soft switching power converter is provided to improve the efficiency. The integrated synchronous rectifier includes a power transistor connected from a transformer to the output of the power converter for rectifying. A controller ... | 08/23/2011 |
| 7974108 | Synchronous rectifying circuit for offline power converter A synchronous rectifying circuit is provided for power converter. An integrated synchronous rectifier has a rectifying terminal, a ground terminal a first input terminal and a second input terminal. The rectifying terminal is coupled to secondary side of a transform... | 07/05/2011 |
| 7952894 | Synchronous rectifier control device and a forward synchronous rectifier circuit A synchronous rectifier control device comprises a status detecting unit, an analog circuit, a first counter, a second counter and a signal process unit. The status detecting unit receives at least one reference signal and a detecting signal to generate a first sync... | 05/31/2011 |
| 7936575 | Synchronous rectifier control using load condition determination In accordance with an embodiment of the present invention, a method of operating a switched power supply is disclosed. The method comprises determining a current load on a secondary side of a transformer by measuring a ratio between a secondary side current conducti... | 05/03/2011 |
| 7924579 | Fly-forward converter power supply A fly-forward converter topology for a switched-mode power supply (SMPS) that may incorporate the advantages of both a forward converter and a flyback converter into a two-stage half-wave converter is provided. The fly-forward converter may be considered as a half-w... | 04/12/2011 |
| 7911813 | Offline synchronous rectifying circuit with sense transistor for resonant switching power converter A synchronous rectifying circuit of a resonant switching power converter is provided to improve the efficiency. The synchronous rectifying circuit includes a power transistor and a diode connected to a transformer and an output ground of the power converter for rect... | 03/22/2011 |
| 7881076 | Buck-boost PFC converters A buck-boost PFC converter is provided and includes an inductor, first and second transistors, a first diode, and a control circuit. The inductor has a first terminal and a second terminal. The first transistor is coupled to a positive-power rail and the first termi... | 02/01/2011 |
| 7872879 | Switched mode power converter and method of operation thereof A switched mode power converter is provided which includes a transformer (2) having a primary winding (2a) and at least one secondary winding (2b); a primary side active switch device (S1) coupled to the primary winding for ... | 01/18/2011 |
| 7864549 | Zero voltage switching coupled inductor boost power converters The subject invention reveals a new coupled inductor boost converter which achieves zero voltage turn on switching for all four circuit switches. The coupled inductor of the circuit is fully clamped and thereby achieves excellent noise performance with neither snubb... | 01/04/2011 |
| 7864548 | Synchronous rectifier control device and forward synchronous rectifier circuit Disclosed are a synchronous rectifier control device and a forward synchronous rectifier circuit. The synchronous rectifier control device is coupled with the secondary side of the forward synchronous rectifier circuit, comprising a condition detecting unit, a refer... | 01/04/2011 |
| 7864547 | Power supply module adapted to power a control circuit of a switching mode power supply A power supply module to power the control circuit of a switching mode power supply is provided. Based on the determination of whether the switching mode power supply is under a light or open load condition, the power supply module can dynamically provide the power ... | 01/04/2011 |
| 7800923 | Offline synchronous switching regulator An offline synchronous switching regulator is proposed for improving the efficiency thereof. Switches are coupled to switch a transformer and generate a switching signal at a secondary side of the transformer. A switching circuit is coupled to an output of the regul... | 09/21/2010 |
| 7796407 | Method and apparatus of providing synchronous regulation for offline power converter A synchronous regulation circuit is provided to improve the efficiency for an offline power converter. A secondary-side switching circuit is coupled to the output of the power converter to generate a synchronous signal and a pulse signal in response to an oscillatio... | 09/14/2010 |
| 7796408 | Half-bridge LLC resonant converter with self-driven synchronous rectifiers The present invention discloses a half-bridge LLC resonant converter with self-driven synchronous rectifiers, which utilizes a primary IC controller and a gate driver to drive the secondary synchronous rectifiers. In correspondence with the gate drive output voltage... | 09/14/2010 |
| 7787264 | Apparatus to provide synchronous rectifying circuit for flyback power converters A synchronous rectifying circuit is provided for flyback power converter. A pulse generator is utilized to generate a pulse signal in response to a leading edge and a trailing edge of a switching signal. The switching signal is used for switching the transformer of ... | 08/31/2010 |
| 7768801 | Current resonant DC-DC converter of multi-output type A current resonant DC-DC converter of multi-output type is provided which comprises an output-regulatory MOS-FET 40 connected between a secondary winding 5c of a transformer 5 and a smoothing capacitor 16 in a second rectifying smo... | 08/03/2010 |
| 7764516 | Method and apparatus of providing synchronous regulation circuit for offline power converter A synchronous regulation circuit is provided. A secondary-side switching circuit is coupled to the output of the power converter to generate a synchronous signal and a pulse signal in response to an oscillation signal and a feedback signal. An isolation device trans... | 07/27/2010 |
| 7701733 | Method and apparatus to provide synchronous rectifying circuit for offline power converters A synchronous rectifying circuit is provided for power converter. A pulse signal generator is utilized to generate a pulse signal in response to the leading edge and the trailing edge of a switching signal. The switching signal is used for switching the transformer ... | 04/20/2010 |
| 7660136 | Method and apparatus for synchronous rectifying of soft switching power converters An apparatus for synchronous rectifying of a soft switching power converter is provided. An integrated synchronous rectifier includes a power transistor coupled between a transformer and the output of the soft switching power converter, and a controller receiving a ... | 02/09/2010 |
| 7630217 | Synchronous rectification forward converter A rectification switch control switch element (Q7) is provided between a gate and a source of a rectification switch element (Q2). The rectification switch control switch element (Q7) is turned ON in response to a signal on a secondary side of a... | 12/08/2009 |
| 7616457 | Synchronous regulation circuit A primary-side switching circuit generates switching signals for switching a transformer. A secondary-side switching circuit is coupled to an output of the power converter to generate pulse signals in response to the switching signals and an output voltage of the po... | 11/10/2009 |
| 7589982 | Synchronous rectifier forward converter with reverse current suppressor Disclosed is a synchronous forward converter having a reverse current suppressor connected to the gate of a freewheel switch. The reverse current suppressor is configured to receive a control input signal generated by an internal circuitry of a power supply system w... | 09/15/2009 |
| 7564702 | High efficiency power converter A power converter nearly losslessly delivers energy and recovers energy from capacitors associated with controlled rectifiers in a secondary winding circuit, each controlled rectifier having a parallel uncontrolled rectifier. First and second primary switches in ser... | 07/21/2009 |
| 7558082 | Method and apparatus for controlling a synchronous rectifier The present invention is directed to a switch mode power converter for supplying an output power to a load, which includes a switching device having a switching input, a switching output, and a control input for enabling or disabling the switching device from conduc... | 07/07/2009 |
| 7558083 | High efficiency power converter A power converter nearly losslessly delivers energy and recovers energy from capacitors associated with controlled rectifiers in a secondary winding circuit, each controlled rectifier having a parallel uncontrolled rectifier. First and second primary switches in ser... | 07/07/2009 |
| 7551459 | Zero voltage switching coupled inductor boost power converters The subject invention reveals a new coupled inductor boost converter which achieves zero voltage turn on switching for all four circuit switches. The coupled inductor of the circuit is fully clamped and thereby achieves excellent noise performance with neither snubb... | 06/23/2009 |
| 7542309 | Voltage stabilizer circuit of forward converter A voltage stabilizer circuit of forward converter is disclosed to include a transformer, a first switch, a rectifier, an error amplifier, a control circuit, and a driving circuit. The control circuit outputs a regulation signal that controls turn-on time of the firs... | 06/02/2009 |
| 7542310 | Synchronous rectification control circuit The present invention discloses a synchronous rectification control circuit, comprising at least one switch unit, a pulse width control unit, a transformer, a first rectification unit, a second rectification unit, a plurality of driving units, a logic operation unit... | 06/02/2009 |
| 7525822 | DC converter including a tertiary winding for driving synchronous rectifiers A DC converter has a transformer with loosely coupled primary and secondary windings, a main switch connected in series with the primary winding of the transformer, and a series circuit connected to ends of one of the primary winding and main switch. The series circ... | 04/28/2009 |
| 7499294 | Self-excitation synchronous rectification driver The present invention discloses a self-excitation synchronous rectification driver, which comprises a self-excitation coil, a self-excitation driver, a synchronous-signal source, a pulse transformer, a positive/negative edge detector, and a latch unit. The synchrono... | 03/03/2009 |
| 7495934 | Adaptive synchronous rectification control circuit and method thereof The adaptive synchronous rectification control circuit and its controlling method for a power converter are provided. The proposed control circuit having a transformer with a primary and a secondary sides, a switch coupled to the primary side and a synchronous recti... | 02/24/2009 |
| 7480158 | Synchronous rectifying forward converter A first drive control signal regenerating circuit outputs an ON timing drive signal at turn-ON of a main switch element, and a second drive control signal regenerating circuit generates an OFF timing drive signal at turn-OFF of the main switch element. A rectifying ... | 01/20/2009 |
| 7474543 | Isolated DC-DC converter A secondary-side rectifying and smoothing circuit rectifies and smoothes an output voltage from a secondary coil of a transformer and outputs a rectified and smoothed voltage to the outside. A tertiary-side rectifying and smoothing circuit rectifies and smoothes an ... | 01/06/2009 |
| 7457137 | Output sensor circuit for power supply regulation with main and switched outputs A sense circuit is provided connected to a control loop of a circuit having an output. The sense circuit receives a signal derived from the output of the circuit and provides a controlling signal to the control loop. In one embodiment, the sense circuit is connected... | 11/25/2008 |
| 7423889 | Forward converter with synchronous rectification A commutation switch turning-on control switching element is controlled with a voltage generated at a fourth coil (auxiliary coil) of a main transformer and controls application of a control voltage to a control terminal of a commutation switching element. A commuta... | 09/09/2008 |
