Power factor correction circuit and method for improving power factor
A power factor correction and circuit technology, which can be used in output power conversion devices, electrical components, high-efficiency power electronic conversion, etc., and can solve problems such as large losses and large current stress.
Active Publication Date: 2013-02-13
HANGZHOU SILAN MICROELECTRONICS
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Problems solved by technology
If the discontinuous mode control method is adopted, the input power factor of the AC incoming line can be 1 in theory, but the current stress of the discontinuous mode control mode is large, and the main circuit switch works in a hard switching state, resulting in large losses
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[0151] The present invention will be further described below in conjunction with specific embodiments and accompanying drawings, but the protection scope of the present invention should not be limited thereby.
[0152] This embodiment provides a method for improving the power factor of a power factor correction circuit, wherein the power factor correction circuit includes a main circuit, an error amplifier and a drive pulse signal generation circuit, and the error amplifier performs error amplification on the output voltage / current of the main circuit The first signal is generated, and the driving pulse signal generating circuit is used to generate a driving pulse signal to control the on / off of the switching tube in the main circuit. In a traditional power factor correction circuit, the first signal output by the error amplifier is directly input to the driving pulse signal generating circuit to generate the driving pulse signal, but in the method for improving the power facto...
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The invention provides a power factor correction circuit and a method for improving a power factor. The power factor correction circuit comprises a main circuit, an error amplifier, a signal tracking circuit, a summing circuit and a driving pulse signal generating circuit, wherein the error amplifier performs error amplification on output current / voltage of the main circuit and then generates a first signal; the signal tracking circuit is used for generating a second signal the frequency and phase of which are same as those of a sine half-wave signal generated by rectification in the main circuit; the summing circuit is used for summing the first signal and the second signal to generate a third signal; and the driving pulse signal generating circuit generates a driving pulse signal according to the third signal, and the driving pulse signal is used for controlling the on / off of a switch tube in the main circuit. According to the invention, the power factor of the power factor correction circuit can be improved.
Description
technical field [0001] The invention relates to a power factor correction circuit and a method for improving power factor. Background technique [0002] At present, the nonlinear components and energy storage components in most electrical equipment will seriously distort the input AC current waveform, resulting in a very low input power factor at the grid side. In order to meet the harmonic requirements of the international standard IEC61000-3-2, it is necessary Add power factor correction devices (PFC) to these electrical equipment. Traditional active power factor correction circuits generally adopt boost (Boost) topology, buck-boost (Buck-boost) topology or step-down (Buck) topology. Among them, the Boost topology has the characteristics of easy control, simple driving, and switching operation in the entire power frequency cycle, and the power factor of the input current can be close to 1. However, the Boost topology has the disadvantage of high output voltage, and under...
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IPC IPC(8): H02M1/42
CPCY02B70/126Y02B70/10Y02P80/10
Inventor 谢小高叶美盼王栋姚丰吴建兴
Owner HANGZHOU SILAN MICROELECTRONICS