Power-factor correction constant current controller and control method

A power factor correction and flow controller technology, applied in the direction of DC power input conversion to DC power output, AC power input conversion to DC power output, control/regulation system, etc., can solve the problem that the bipolar drive structure is difficult to adapt to the requirements, etc. , to achieve the effect of improving system reliability, long life and reducing system cost
CN103296904AActive Publication Date: 2013-09-11SHANGHAI BRIGHT POWER SEMICONDUCTOR CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHANGHAI BRIGHT POWER SEMICONDUCTOR CO LTD
Publication Date
2013-09-11

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Abstract

The invention relates to a PFC constant current controller and a control method of the PFC constant current controller. Unlike the traditional mode of additionally adding a PFC circuit besides a PWM controller, the PFC constant current controller integrates a single-stage PFC circuit and the PWM controller. The PFC constant current controller comprises a peak value sampling device, a feedback signal detector, a sigma delta modulator, a digital signal processor, a digital to analog converter, a comparator, a PWM generator and a power switch driver. The PFC constant current controller can obtain sampled signals of current output by a flyback switching power supply system, and the sampled signals serve as feedback signals to generate a constant-current control signal to be used for controlling averagely-output current. Therefore, the averagely-output currents are limited within a preset reference value, and accordingly the target of constant-current control is achieved.
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Description

technical field

[0001] The invention relates to a switching power supply system, in particular to a power factor correction constant current controller and a control method in the switching power supply system. Background technique

[0002] At present, in an AC-DC conversion (AC-DC) system, a flyback power conversion system is the most widely used switching power supply topology. The system converts high-voltage AC input into DC output through PWM control technology, and realizes electrical isolation between input and output through a transformer. figure 1 It is a traditional flyback AC-DC switching power supply power conversion system 100, which is composed of an input rectifier (input rectifier) ​​110, a power converter 120, a feedback network 130 and a pulse width modulation (PWM) controller 140. Such as figure 1 As shown, the input AC voltage Vac is firstly converted into an approximate DC voltage Vin by the input full-bridge rectification and filter capacitor C1 to pr...

Claims

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