Control circuit capable of increasing power factor and revising load response
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
Smart Images
Figure 1 Figure 2 Figure 3
Abstract
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)|, ...