High frequency push-pull converter with input power factor correction
First Claim
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1. A single stage boost converter and high-frequency DC/AC power inverter apparatus comprising:
- a pair of input terminals for connection to a source of AC voltage,rectifier means having an input coupled to said pair of input terminals and an output,a transformer having first and second primary windings and a secondary winding,inductor means coupling said first and second transformer primary windings to said output of the rectifier means,a pair of first and second switching transistors coupled to said first and second transformer primary windings to control current flow therein,a storage capacitor coupled to said first and second transformer primary windings and to the output of the rectifier means,a pair of output terminals for connection to a load,an LC resonant circuit coupling said transformer secondary winding to said pair of output terminals, anda single control circuit responsive to an output voltage at said output terminals and, via a circuit path independent of a load circuit coupled to said output terminals, to a voltage developed across the storage capacitor, thereby to supply complementary switching control signals to respective control electrodes of said first and second switching transistors.
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Abstract
A single stage high frequency push-pull converter with input power factor correction. The boost converter for input power factor correction and the high-frequency push-pull DC/AC inverter are combined into a single stage converter thereby reducing the number of circuit components while at the same time reducing the voltage stress on the high frequency switching transistors of the converter.
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Citations
20 Claims
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1. A single stage boost converter and high-frequency DC/AC power inverter apparatus comprising:
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a pair of input terminals for connection to a source of AC voltage, rectifier means having an input coupled to said pair of input terminals and an output, a transformer having first and second primary windings and a secondary winding, inductor means coupling said first and second transformer primary windings to said output of the rectifier means, a pair of first and second switching transistors coupled to said first and second transformer primary windings to control current flow therein, a storage capacitor coupled to said first and second transformer primary windings and to the output of the rectifier means, a pair of output terminals for connection to a load, an LC resonant circuit coupling said transformer secondary winding to said pair of output terminals, and a single control circuit responsive to an output voltage at said output terminals and, via a circuit path independent of a load circuit coupled to said output terminals, to a voltage developed across the storage capacitor, thereby to supply complementary switching control signals to respective control electrodes of said first and second switching transistors. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A high frequency push-pull converter power supply comprising:
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an input terminal for connection to a source of supply voltage, an output terminal for connection to a load circuit, a transformer having first and second primary windings and a secondary winding coupled to said output terminal, an energy storage capacitor, inductor means coupling said input terminal via at least one of said first and second primary windings of the transformer to said energy storage capacitor, first and second switching transistors coupled to said first and second transformer primary windings so as to control current flow therein in a push-pull mode of operation, and a control circuit having input means coupled to said load circuit and to said storage capacitor such that the control circuit is responsive to a voltage determined by the load circuit and to a voltage developed across the storage capacitor thereby to supply complementary switching control signals to respective control electrodes of said first and second switching transistors. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification