Power converting apparatus and converting method thereof
AssigneeLite-On Technology Corporation
InventorJun-Yu Lai
Life of this patent
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Abstract
A power converting apparatus and a converting method thereof are provided. A power converting apparatus includes a transformer circuit and a bridge switching circuit coupled to an input side circuit of the transformer circuit. A switching frequency control circuit generates a compensation frequency according to an input voltage of the bridge switching circuit and adjusts a switching frequency of the bridge switching circuit based on the compensation frequency.
Claims16
A power converting apparatus, comprising:
- a first bridge switching circuit having an input terminal receiving an input voltage;
- a transformer circuit comprising an input side circuit and an output side circuit, wherein the input side circuit is coupled to the first bridge switching circuit;
- a switching frequency control circuit generating a compensation frequency according to the input voltage and adjusting a switching frequency of the first bridge switching circuit according to the compensation frequency;
- and
- a power factor correction circuit coupled to the first bridge switching circuit and the switching frequency control circuit and providing a direct current (DC) voltage to serve as the input voltage according to an input alternating current (AC) signal,
- wherein the switching frequency control circuit performs bandpass filtering on the DC voltage according to a frequency of the input AC signal to generate a ripple signal with a ripple frequency, and the switching frequency control circuit generates the compensation frequency according to the ripple signal and a relationship between a voltage gain of the power converting apparatus and a control frequency.
A converting method of a power converting apparatus, wherein the power converting apparatus comprises a first bridge switching circuit and a transformer circuit, wherein an input terminal of the first bridge switching circuit receives an input voltage, the transformer circuit comprises an input side circuit and an output side circuit, the input side circuit is coupled to the first bridge switching circuit, and the converting method of the power converting apparatus comprising:
- generating a compensation frequency according to the input voltage;
- adjusting a switching frequency of the first bridge switching circuit according to the compensation frequency;
- providing a power factor correction circuit to provide a direct current (DC) voltage to serve as the input voltage according to an input alternating current (AC) signal;
- performing bandpass filtering on the DC voltage according to a frequency of the input AC signal to generate a ripple signal with a ripple frequency;
- and
- generating the compensation frequency according to the ripple signal and a relationship between a voltage gain of the power converting apparatus and a control frequency.
Dependencies are inferred from the claim text.