A method for generating phase-shifting pulse width modulation pulses in a digitally controlled switching power supply

A phase-shifting pulse width modulation and numerical control switching technology, applied in the direction of pulse duration/width modulation, etc., can solve the problem of needing large-capacity memory, etc., and achieve the effect of simple circuit structure, rapid control, and convenient control.
CN110972567BActive Publication Date: 2012-07-183RD GENERAL DESIGN DEPT CHINA AEROSPACE SCI & IND CORP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
3RD GENERAL DESIGN DEPT CHINA AEROSPACE SCI & IND CORP
Publication Date
2012-07-18

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Abstract

The invention relates to a digitally controlled switching power supply, and specifically discloses a method for generating phase-shifting pulse width modulation pulses in a digitally controlled switching power supply. Set up two comparators A and B, the negative terminals of the two comparators are respectively connected to the output terminal of a counter, and the counter is set to count circularly. The count value C first counts down from the counting upper limit value C max to 0, and then from 0 Count up to C max; start the counter again, calculate the comparison value X and Y, and send them to the positive terminals of the two comparators A and B respectively synchronously. The invention compares the comparison value generated by the formula with the count value of decrement and increment, controls the high and low levels of the output pulse, solves the problem that a large-capacity memory is needed in the method of generating phase-shifting PWM pulses in the numerical control system, and can generate 0 to 180 ° PWM pulse with adjustable phase shift angle, and the PWM pulse is directly generated by the comparator, the control is fast, the circuit structure is simple, the hardware is less, and the resources of the central processing unit do not need to be occupied.
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Description

technical field

[0001] The invention relates to a digitally controlled switching power supply, in particular to a method for generating phase-shifting pulse width modulation pulses in a digitally controlled switching power supply. Background technique

[0002] The method of phase-shift control is widely used in switching power supplies. Early analog-controlled switching power supplies use dedicated control chips, which can generate phase-shifted pulse width modulation pulses (hereinafter referred to as PWM pulses). With the continuous development of digital technology, many engineers and technicians have introduced numerical control chips into the control field of switching power supplies, but how to generate 0-180° phase-shifted pulse width modulation pulses (PWM pulses) is a key technology that needs to be solved . Wang Cong, Wu Hongjie, and Wei Weihua published an article "All-digital PWM controller for DC / DC full-bridge converter" in "Power Electronics Technology" No. 6...

Claims

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