BOOST PFC convertor starting output voltage anti-overshoot digital control method

A technology of output voltage and digital control, which is applied in the direction of output power conversion devices, electrical components, sustainable manufacturing/processing, etc., can solve the problems of output start-up overshoot, etc., and achieves easy modification, convenient programming, and simple and practical principles Effect

Inactive Publication Date: 2016-02-03
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when the PI voltage ensures the stability of the loop, it is still easy to generate output start-up overshoot

Method used

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  • BOOST PFC convertor starting output voltage anti-overshoot digital control method
  • BOOST PFC convertor starting output voltage anti-overshoot digital control method
  • BOOST PFC convertor starting output voltage anti-overshoot digital control method

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Embodiment Construction

[0024] The present invention will be further described below in conjunction with specific examples.

[0025] With the continuous improvement of digital control theory and implementation methods, and with highly integrated control circuits, precise control accuracy, perfect communication capabilities and comprehensive power management functions, it has become an important application method of power electronics.

[0026] Such as Figure 1 to Figure 3 As shown, V in_L and V in_N is the line voltage of the input AC voltage, V bus is the output DC voltage, L1 is the BOOST PFC inductor, D1 is the BOOST circuit diode, D3 is the anti-inductance start saturation diode, D4, D5, D6, D7 are rectifier diodes, Q1 is the power switch tube, C o is the output filter capacitor, R o is the output load, R s is the inductor current sense resistor, V ref Reference voltage, V o is the output sampling voltage, I L is the sampling value of the inductance, V in Input peak sampling voltage, V ...

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Abstract

The present invention discloses a BOOST PFC convertor starting output voltage anti-overshoot digital control method. Control signals and reference voltage signals of PWM are changed through a DSP controller and a program, and the control of the algorithm is realized in the response interruption mode. At the moment of starting a PFC circuit, main power switch tube PWM signals are turned off so that the switch tube is located at the turn-off phase; and when the output direct voltage is equal to or close to a rectified output voltage, the reference value of the output voltage is equal to the rectified voltage, and the PWM signals are turned on. The reference voltage is changed to gradually increase to a setting value of the output voltage so that a soft-start function is completed. Without adding any hardware circuit elements, the starting output voltage overshoot of a BOOST PFC convertor may be avoided in a simple and effective digital control mode.

Description

technical field [0001] The invention relates to the technical field of digital control for anti-overshoot startup, in particular to a digital control method for realizing anti-overshoot of startup output voltage for a BOOST PFC converter. Background technique [0002] Active Power Factor Correction (APFC, ActivePowerFactorCorrection) technology is widely used in the field of switching power supplies, of which BOOSTPFC circuit is mainly used in high-power applications, and its normal input voltage range is 90V-264VAC. In order to make the BOOST converter work stably and stabilize the output voltage, it is necessary to control the output voltage in a loop. Under normal circumstances, due to the low bandwidth of the voltage loop, the response to the change of the input voltage is slow, so the BOOSTPFC circuit is prone to overshoot of the output voltage during the startup process, especially during the startup process of high-voltage input, which may easily cause switching tubes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/36
CPCY02P80/10
Inventor 冯颖罗康杜娟陈新开苏比哈什·如凯迦
Owner SOUTH CHINA UNIV OF TECH
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