by: Malik, Randhir S.; Hemena, William;

Resonant converter circuit

A power converter circuit is disclosed. The power converter circuit comprises an oscillator for receiving an input wherein the oscillator operates with a fixed frequency and a resonant circuit coupled to the oscillator, wherein the resonant circuit is adjusted to minimize switching losses. Through the use the power converter circuit in accordance with the present invention, high switching losses are avoided thereby resulting in an increase in the overall efficiency of the power converter circuit.






What is claimed is:

1. A resonant converter circuit comprising:

an oscillator for receiving an input wherein the oscillator operates with a fixed frequency;

a resonant circuit coupled to the oscillator, the resonant circuit comprising a transformer, at least two capacitors in series coupled to a secondary winding of the transformer, and a switch coupled to one of the at least two capacitors; and

a pulse width modulator coupled to the resonant circuit, wherein the pulse width modulator is utilized to vary a capacitance of the resonant circuit.

2. The resonant converter circuit of claim 1 wherein the circuit further comprises:

an error amplifier coupled to the pulse width modulator for receiving an output.

3. The resonant converter circuit of claim 1 wherein the pulse width modulator turns the switch on and off at a variable rate.

4. The resonant converter circuit of claim 3 wherein the oscillator comprises a square wave oscillator.

5. The circuit of claim 4 wherein the square wave oscillator is coupled to two switches wherein the switches operate in a zero voltage switch mode.

6. A resonant converter circuit comprising:

a square wave oscillator for receiving an input wherein the oscillator operates with a fixed frequency;

a resonant circuit coupled to the square wave oscillator, the resonant circuit comprising:

a transformer;

at least two capacitors in series coupled to a secondary winding of the transformer; and

a switch coupled to one of the at least two capacitors; and

a pulse width modulator coupled to the switch wherein the pulse width modulator is utilized to vary a capacitance of the resonant circuit.

7. The resonant converter circuit of claim 6 further comprising an error amplifier coupled to the pulse width modulator for receiving an output.

8. The resonant converter circuit of claim 7 wherein the square wave oscillator is coupled to two switches wherein the switches operate in a zero voltage switch mode.

9. A power converter circuit comprising:

a square wave oscillator for receiving an input wherein the oscillator operates with a fixed frequency;

two switches coupled to the square wave oscillator wherein the two switches operate in a zero voltage switch mode;

a resonant circuit coupled to the square wave oscillator, the resonant circuit comprising:

an inductor;

a transformer coupled to the inductor;

at least two capacitors in series coupled to a secondary winding of the transformer; and

a switch coupled to one of the at least two capacitors;

a pulse width modulator coupled to the resonant circuit via the switch wherein the pulse width modulator is utilized to vary a capacitance of the resonant circuit; and

an error amplifier coupled to the pulse width modulator for receiving an output.


logo
Clip

Electrical circuit tester

Desulfurizing fossil fuels

Compact electric asymmetry brake

Suspension mechanism for tracked vehicles

Automotive air conditioner

Energy efficient domestic refrigeration system

Ergonomic arm support

Surveillance system and method

Foreign matter detecting device

Paraffin ammoxidation process

Photoreactive suturing of biological materials

Radiating device for hyperthermia

1,3,4-Thiadiazines

Bearing play adjusting assembly

Memory protection circuit

Ophthalmic device for dispensing eyedrops

Cord adjusters

Thermosetting powdery coating composition

Method of making field emitters

Composite frame member

Positioning controller

Vibration isolation system

Article comprising microcavity light sources

Backwashing-type filtering apparatus

Electrophotographic x-ray device

High voltage cut-off semiconductor device

Composite membranes for fluid separations

Golf course

Thermally-induced hydrolysis of acetal

Distributed crossbar switch architecture

Flexible textile spindle assembly

Tapered electrode for stacked capacitors

Cooling device

Model house

Micropower differential sensor measurement

Hammer drills for making boreholes

Damper

Singulator for document feeder

Phase shift demodulator

Electrophotographic image forming apparatus

Withstand-voltage tire

Yarn texturing nozzle

Endoscopic microsurgical instruments

Process for preparing polyolefins

Tipping rack for bottle

Circuit interlock arrangement

Sewing machine

Statistical weighing

Cuvette rail

Power amplifier apparatus

Swine feeding apparatus

Diet control device and method

Modified asphalt hydraulic sealer

Bis(alkyleneoxybenzophenone) ultraviolet light absorbers

Catalyst combustion device

Window lifting and lowering apparatus

Image recording apparatus

Stump cutter

Shielded cable cutting device

Bearing system with water exclusion

Power source device

Memory access optimizing method

Power-off brake with manual release

Automobile window shield and covering

Unit trigger actuator

Wrap-back test system and method

Compound machining apparatus

Tubular grafts from purified submucosa

Flexible pipe joint system

Acoustic hit indicator

Tricyclic 5-HT.sub.3 receptor antagonists

Spa cover lift

Handle bag of plastic film

Internal combustion engine

Signal reproducing circuit

High-pressure discharge lamp

Polymerization of olefin

Power muscle stimulator

Device for use in diagnosis

Lifting mechanism

Iodine adsorbent

In-situ control system for atomization

Locking hole punch

Air-fuel ratio controller

Amino acid sequence pattern matching

Droppable airborne buoy

Headlamp with displacement gauge

Drill pipe tong retaining apparatus