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Dual-rectification bridge type single stage PFC converter

  • US 10,498,226 B2
  • Filed: 04/24/2019
  • Issued: 12/03/2019
  • Est. Priority Date: 04/24/2018
  • Status: Active Grant
First Claim
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1. A dual-rectification bridge type single stage PFC converter circuit, comprising:

  • a first input rectification circuit, a second input rectification circuit, a storage capacitor, a boost converter, a bridge type DC-DC converter, and a feedback control and driving unit, the boost converter comprising a boost capacitor and a boost circuit;

    wherein the first input rectification circuit rectifies an input voltage and charges the storage capacitor by forming a first input rectification loop;

    the second input rectification circuit rectifies the input voltage and charges the boost capacitor by forming a second input rectification loop;

    one node of the storage capacitor, one node of the boost capacitor and an output of the first input rectification circuit are connected together at a same polarity;

    wherein the bridge type DC-DC converter comprises a first bridge arm comprising at least a first switching component and a second switching component;

    wherein the bridge type DC-DC converter has a half or a full bridge topology and contains a main transformer, the main transformer including at least one primary winding and at least one secondary winding, the primary winding being driven at least by the first bridge arm, the secondary winding delivering power to an output load through a rectification and filter circuit;

    or the bridge type DC-DC converter is a BUCK topology and contains a main inductor, the main inductor being driven at least by the first bridge arm and delivering power energy to an output load through a rectification and filter circuit;

    wherein the boost circuit comprises a first boost inductor, as well as the first and second switching components of the bridge type DC-DC converter;

    wherein during conduction of the first switching component and cut-off of the second switching component, the first boost inductor, the boost capacitor and the first switching component form a first boost loop that charges the first boost inductor by the boost capacitor;

    during conduction of the second switching component and cut-off of the first switching component, the first boost inductor, the boost capacitor, the second switching component and the storage capacitor form a second boost loop that charges the storage capacitor through a superimposed voltage of an induced voltage on the first boost inductor and a voltage on the boost capacitor;

    wherein during conduction of the first switching component and cut-off of the second switching component, the storage capacitor, the primary winding of the main transformer or the main inductor, and the first switching component form a first DC-DC loop;

    during conduction of the second switching component and cut-off of the first switching component, the primary winding of the main transformer or the main inductor, and the second switching component form a second DC-DC loop;

    wherein the feedback control and driving unit senses and feedbacks an output of the bridge type DC-DC converter, generates a chopping signal to control the first and second switching components'"'"' conduction and cut-off by comparing with a setting value and according to an automatic control theory, so as to control an output voltage, or current, or power of the bridge type DC-DC converter.

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