Control circuit capable of increasing power factor and revising load response

A technology for power factor correction and power improvement, which is applied to output power conversion devices, high-efficiency power electronic conversion, and conversion of AC power input to DC power output. The problem of slow ring response is solved, and the circuit structure is simple and reliable, the system cost is reduced, and the effect is easy to implement.
CN101702587BActive Publication Date: 2012-05-23上海硅虹微电子科技有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
上海硅虹微电子科技有限公司
Publication Date
2012-05-23

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Abstract

The invention relates to a control circuit, in particular to a control circuit capable of increasing power factor and revising load response, belonging to the power management field. According to the technical scheme provided by the invention, the control circuit comprises a rectifying circuit connected with the alternating current, a power factor correcting circuit and a feedback control and drive module, wherein the rectifying circuit is used for rectifying the input alternating current and then outputting the alternating current; the power factor correcting circuit is connected with the output end of the rectifying circuit, is used for adjusting the power factor of the output voltage and current of the rectifying circuit, and is connected with a load; and the feedback control and drivemodule is used for receiving the voltage and current output by the rectifying circuit and the feedback voltage of the load, then comparing the voltage and current output by the rectifying circuit with the feedback voltage of the load, controlling transformation, outputting the pulse width modulated signal and controlling the on-off of a switching tube in a power factor correction circuit. The control circuit of the invention can increase the load response of the system and reduce the interference and influence of the harmonic wave to the grid.
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Description

Technical field

[0001] The invention relates to a control circuit, in particular to a control circuit for improving power factor correction load response, and belongs to the field of power management. Background technique

[0002] The function of the power factor correction circuit is to reduce the interference and impact of the harmonics generated by the electrical appliances on the power grid, thereby reducing the useless power consumption on the power grid. The principle of power factor correction is to adjust the input current waveform to make it consistent with the input voltage waveform; if the input voltage waveform is a sine wave alternating current, the input current waveform must also be a sine wave, and the phases of the two must be consistent.

[0003] Such as figure 1 Shown is a feedback control circuit for commonly used power factor correction. Output voltage of rectifier circuit V in Reconstruct the module through sine wave to get the voltage V in |sin(2πF L T)|, ...

Claims

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