Ripple reduction circuit based on input feedforward and loop control and coating power supply

Abstract

The invention relates to a ripple reduction circuit based on input feedforward and loop control. The circuit comprises a rectifier, a voltage loop control circuit, a filtering phase-shifting amplitude limiting circuit and a booster circuit, the output end of the rectifier is connected with the input end of the filtering phase-shifting amplitude limiting circuit; a first coupling voltage output by the voltage loop control circuit is coupled with a second coupling voltage output by the filtering phase-shifting amplitude limiting circuit to obtain a coupling voltage signal; processing the coupling voltage signal through a current loop controller to obtain a dynamic voltage signal; the filtering phase-shifting amplitude limiting circuit comprises a differential extraction circuit, a filtering phase-shifting circuit, an amplitude limiting circuit and a filtering phase-shifting coupling circuit; the voltage loop control circuit comprises a voltage loop controller and a voltage loop coupling circuit; and the output end of the current loop controller is connected with the pulse width modulation signal generator. According to the scheme, low-frequency ripples can be restrained, the system can achieve ultra-high-speed response, the high-performance requirement is met, and the situation that rear-end electric equipment is damaged is avoided.

Description

technical field [0001] The present application relates to the field of power supply technology, in particular to a ripple reduction circuit and a coating power supply based on input feedforward and loop control. Background technique [0002] The control strategy of conventional semiconductor coating power supply and photovoltaic coating power supply is generally AC rectification to DC+isolated voltage-regulated pulse output, or use PFC circuit + isolated voltage-regulated pulse output, resulting in the output of external alternating current with 100Hz or 300Hz after being rectified by the rectifier The DC voltage with low-frequency ripples reduces the efficiency of the power supply, and it is easy to generate harmonics on the back-end electrical equipment, resulting in damage to the back-end electrical equipment. [0003] In the prior art, in the patent with publication number CN108512451B (Digital control device for low-frequency ripple suppression of flyback micro-inverter...

AI Technical Summary

Problems solved by technology

[0005] Need to add a digital chip, and 3.3V power supply line, etc., the cost is very high

Moreover, the real-time performance of digital control is very poor, and it can suppress low frequencies, but the power supply loop bandwidth is much lower than the loop bandwidth designed with analog chips, and the fast input or output dynamic response is not timely

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