Power factor correction circuit within broad voltage range

Abstract

A power factor correcting circuit within wide voltage range is composed of a boost up circuit consisting of boost inductor, diode, energy-accumulating capacitor and FET, a control circuit comprising power factor corrector chip and its peripheral elements, and an additional non-linear conpensating circuit for providing the compensation voltage to said control circuit and composed of two voltage-dividing resistors, filter capacitor, voltage-stabilizing diode and a transistor. Its advantage is basically no cross-zero distortion of input current.

Description

technical field [0001] The invention relates to a power factor correction circuit in power electronics, in particular to a power factor correction circuit within a wide voltage range. Background technique [0002] In the prior art, for low-power applications such as electronic ballasts, the power factor correction generally adopts critical conduction mode technology, such as figure 1 shown. The circuit mainly includes two parts: Boost Boost circuit and control circuit. The boost circuit is composed of the primary coil of the boost inductor T1, the freewheeling diode D2, the field effect transistor M1 and the energy storage capacitor C4; the control circuit is mainly composed of a power factor correction integrated chip working in the critical conduction mode peak current detection state PFC IC and its peripheral components. [0003] refer to figure 1 As shown, the signal of the input pin 3 of the internal multiplier of the power factor correction integrated chip PFC IC i...

AI Technical Summary

Problems solved by technology

[0037] In general, the ideal operating frequency of the power factor correction integrated chip PFC IC is designed at 25KHz ~ 50KHz, when the operating frequency is too high, it will cause distortion of the input current at zero crossing

[0038] Because of the above reasons, the power factor correction circuit in the prior art appears such as Figure 4a , 4b 、Phenomenon 4c, that is, the zero-crossing distortion of the input current will increase with the increase of the power supply voltage

Images