Matches 101 - 150 out of 337 < 1 2 3 4 5 6 7 >
Match Document Document Title
6166924 Device and method of supplying energy from an ac source in an ac to dc converter  
In an arrangement for supplying energy from an a.c. voltage source that includes a rectifier bridge (D1) and a converter (TR1, D5, C4), an inductor means (L1) is connected between a first output...
6163467 Switching power supply for generating DC voltage by synchronous rectification  
A switching power supply of a synchronous rectification type is provided. A transformer has at least a primary winding and a secondary winding. A main switching element switches input DC current...
6151225 Switching mode power supply  
A switching mode power supply including a transformer, a power transistor, rectifiers, filters, a feedback portion, a power transistor controlling portion, and a synchronous signal controlling...
6147882 Single-stage input current shaping technique with voltage-doubler rectifier front-end  
A single-stage input-current-shaping (S 2 ICS) converter of the present invention integrates a voltage-doubler-rectifier front-end with a DC/DC output stage. Two families of voltage-doubler S 2 ...
6121768 D.C.-D.C.-type bidirectional voltage converters and current sensor  
A bidirectional current sensor including a transformer having a primary winding arranged in a circuit likely to be run through by a current to be measured, a secondary winding, an impedance for...
6108217 Backup power circuit  
A backup power circuit provides reserve power to a terminal device in the event of loss of power from the main power source. In the terminal device, the main power source is connected to a power...
6088242 Switched-mode power supply having a reduced harmonic load on the mains  
A switched mode power supplier having an improved power factor, that is to say a reduced harmonic load on the mains comprising a switch mode power supply with a reduced harmonic load on mains,...
6088247 Voltage clamp  
A voltage clamp for a single-ended flyback converter provides partial leakage energy recovery and noise suppression. The voltage clamp is an improved version of a conventional RCD clamp. The...
6072291 Frequency converter for an electromotor  
The invention concerns a frequency converter for an electromotor with an intermediary circuit, in which a braking circuit with a switch and a load is arranged. With such a frequency converter, it...
6069800 Line harmonic correcting flyback power converter  
Effective harmonic correction without frequency, power or voltage limitations is achieved in a single-stage DC-to-DC converter by disconnecting the bulk capacitor of a typical single-stage...
6069799 Self-synchronized drive circuit for a synchronous rectifier in a clamped-mode power converter  
A power converter having an input and output and a method of operating the power converter. In one embodiment, the power converter includes a power transformer having primary and secondary windings...
6052290 Switch-mode supply with power factor correction  
A circuit for providing a rectified voltage to a flyback switch-mode supply circuit comprises a rectifying bridge having output terminals; a primary winding of the switch-mode supply having an...
6049471 Controller for pulse width modulation circuit using AC sine wave from DC input signal  
A pulse width modulation (PWM) controller suitable for use with a variety of open loop topology power supply circuits including ring generator circuits. The controller and the circuit realized...
6038145 Controller for a power switch and method of operation thereof  
A controller for a power switch having an isolated control terminal and coupled to a secondary winding of a drive transformer and a method of preventing spurious turn-on of the power switch. The...
6021051 Power converter with crowbar circuit and control for very fast output voltage turn-off  
A forward converter, having a single switching device, is coupled through an isolation transformer to a crowbar circuit and an output capacitor for controlling the isolated output voltage turn-off....
6018469 Low cost high efficiency power converter  
A switch mode power converter achieving high efficiency through zero voltage switching (ZVS) by using an auxiliary switch, a capacitor, an auxiliary winding and an inductor. The technique can be...
6014321 Electronic switched-mode power supply and its use  
The invention is directed to an electronic switched-mode power supply for supplying power to an electrical energy-absorbing device from an AC or DC voltage source of different voltage levels, with...
6011360 High efficiency dimmable cold cathode fluorescent lamp ballast  
A ballast including an inverter and a circuit having a resonant frequency coupled to the output of the inverter. In one embodiment of the invention, the only discrete type of element substantially...
6011703 Self-synchronized gate drive for power converter employing self-driven synchronous rectifier and method of operation thereof  
For use with a synchronous rectifier of a power converter, a self-synchronizing drive circuit and a method of driving the synchronous rectifier. In one embodiment, the circuit includes: (1) a drive...
6005780 Single-stage AC/DC conversion with PFC-tapped transformers  
Improved AC/DC conversion in power supplies having an isolation transformer located between rectified-AC input and DC output leads. The transformer is given a primary winding having one or more...
6002598 Switched-mode power supply having an improved start-up circuit  
A switched-mode power supply includes a transformer (TR) provided with a primary winding (P) having a first primary terminal (1), coupled to receive a voltage (U) with respect to a ground terminal...
5991170 Equipment and method for transmitting electric power  
In an electric power transmission device which transmits electric power between a primary coil and a secondary coil, a resonant frequency of the secondary coil side is arranged to become higher...
5982638 Single stage power converter with regenerative snubber and power factor correction  
A single stage DC-DC power converter uses a combined power factor control and snubber circuit. The combined circuit uses a small inductor connected at one end to the positive rail of the DC power...
5977754 Offset resonance zero volt switching boost converter  
A boost converter circuit which includes elements capable of generating a zero volt switching (ZVS) signal across the power switch. The ZVS generating elements include a switched shunt inductance...
5973938 Switched-mode power supply  
A switched-mode power supply comprises a transformer (2) having a primary winding (4) connected to a first pair of direct voltage terminals (8, 10) via a switching transistor (6) and having a...
5963438 Bi-directional magnetic isolator  
A bi-directional, magnetic isolator which can pass an isolated housekeeping supply voltage from an input side to an output side and can also transfer an isolated error signal from the output side...
5930124 Switching power supply  
A switching power supply is provided in which the efficiency is improved and the regulation and cross-regulation of an output voltage is also improved. Terminals (A) and (B) of a primary winding N1...
5930123 Reset circuit for current transformer having a short reset interval  
A current transformer reset circuit, which uses two separately controlled operational parts to reset a current transformer. The first operational part is a current source used to generate a reset...
5917714 Switching power supply with input voltage reduction detection  
A switching power supply which takes out an output current from a secondary winding when a switching circuit for switching a current flowing through a primary winding is turned off and supplies a...
5907479 Integrated filter forward converters  
A family of integrated filter forward converters includes a filter inductor is magnetically included in the transformer assembly. A basic circuit includes a DC voltage source, two cross-coupled...
5896278 Non-contact electric power transmission apparatus  
A non-contact electric power transmission apparatus including a power supply unit and a load unit. The power supply unit has a first oscillation circuit, a signal secondary winding, a filter...
5892671 Control circuit for a switching transistor using a tapped coil with oppositely wound coil parts  
A line deflection circuit for a television receiver or a switched-mode power supply operate with a switching transistor that is connected in series with the primary winding of a transformer and is...
5886880 Power circuit for transferring energy by alternately switching winding circuits of a transformer at high speed  
In a power supply unit, AC energy is converted to DC energy and stored into a first capacitor to which a first winding of a transformer is connected. An anti-parallel circuit of a first transistor...
5872704 Low voltage supply cutoff circuit for an electronic appliance  
A low voltage supply cutoff process and circuit for terminating supply of electric power less than a required minimum voltage to a monitor or a computer system in order to prevent malfunction of...
RE36098 Optimal resetting of the transformer's core in single-ended forward converters  
The transformer's core in single ended forward converters is reset by a "magnetizing current mirror" consisting of a capacitor in series with an auxiliary switch which, during the OFF period of the...
5856916 Assembly set including a static converter with controlled switch and control circuit  
A power supply assembly is disclosed which includes a resonant static converter of the Zero Voltage Switching type having a mono-switch at the primary and a rectifier circuit at the secondary; it...
5844793 High-voltage transformer for a televison receiver including separated partial windings tuned to different harmonics  
A high-voltage transformer for a television receiver is known to be tuned to a specific harmonic of the frequency of the flyback oscillation in order to reduce the internal resistance of the...
5844786 DC-DC converter circuit and inductive load driver using it  
An inductive load drive device comprising a DC--DC converter circuit which has a coil (L) and switch (Sw) in series with a power source (E) and a capacitor (C) provided in parallel with the switch...
5828557 Flyback transformer  
A flyback transformer which comprises: a primary-side coil; a secondary-side high-voltage coil divided into a predetermined number of coil pieces; high-voltage rectifier diodes connected, in the...
5828558 PWN controller use with open loop flyback type DC to AC converter  
A controller and ring generator circuit realized therefrom utilizing an open loop flyback topology to achieve a desired output voltage waveform. A characteristic feature of the controller is that...
5812382 Electrical device with a transformer whose primary is supplied under the control of a chopper  
An electrical device for use with a transformer whose primary 2 is supplied under the control of a transistor acting as a high frequency chopper, and from which the secondary delivers a low voltage...
5808879 Half-bridge zero-voltage-switched PWM flyback DC/DC converter  
A DC-DC ZVS PWM converter circuit which utilizes the leakage inductance of an output transformer and a three-step operation cycle so as to reduce the voltage stress on the converter power switching...
5805432 Resonant DC-DC converter capable of controlling by pulse width modulation  
In a resonant DC-DC converter for converting a d.c. input voltage into a d.c. output voltage, a main switching element (3) switches the d.c. input voltage under control of switching pulses to...
5790390 Power supply with reduced EMI  
A power supply system includes an a-c. power source and an off-line power supply for storing energy from the a-c. power source during first selected time intervals and converting at least a portion...
5790389 Consolidated soft-switching AC/DC converters  
A family of consolidated soft-switching AC/DC PFC converters, for power supplies and related uses. Any of several effective circuitry designs is interposed from an intermediate node on a rectified...
5784266 Single magnetic low loss high frequency converter  
An improved magnetically integrated power converter which are provided specifically for use with power supplies with high density requirements. The converters comprise an integrated magnetic device...
5771160 Multi-output switching regulator having controlled timing of boost convertor, inverter and flyback type outputs  
A multi-output switching regulator includes a rectifier circuit portion for converting an alternating current into a direct current, a boost converter portion for boost-converting the direct...
5745351 DC-to-DC bidirectional voltage converters and current sensor  
A bidirectional voltage converter comprises an inductive element, a primary circuit having a first chopping switch and a first diode, and at least a secondary circuit having a second chopping...
5734564 High-efficiency switching power converter  
For use with a power supply having a controllable switch that switches in response to a drive signal received from a drive signal generator, a circuit for, and method of, modifying the drive signal...
5724236 Power converter transformer having an auxilliary winding and electrostatic shield to suppress noise  
A reduced noise power converter is provided with a transformer having primary, secondary, and auxiliary windings (22, 24, and 46). An electrostatic shield (26) having a shield termination (32) is...
Matches 101 - 150 out of 337 < 1 2 3 4 5 6 7 >