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A power frequency hopping circuit

A switching power supply circuit and power supply technology, applied in the direction of electrical components, output power conversion devices, etc., can solve the problems of bus low-frequency fluctuations, electromagnetic interference frequency band concentration, etc., and achieve the effect of small hardware overhead and simple circuit structure

Active Publication Date: 2020-01-17
SG MICRO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solved technical problems: When switching power supplies with multiple frequencies work on one bus, beat frequency causes large low-frequency fluctuations on the bus and excessive concentration of electromagnetic interference frequency bands

Method used

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  • A power frequency hopping circuit

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Embodiment Construction

[0022] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0023] like figure 1 As shown, the power frequency hopping circuit of the present invention includes: a switch oscillator FF, a timing oscillator FC, a latch L, a counter C and a flip-flop R;

[0024] The timing oscillator FC is connected to the R input terminal of the trigger R, and the trigger R is reset when the output voltage UT of the timing oscillator FC jumps;

[0025] The S input end of the flip-flop R is connected to the counter C, the output end of the flip-flop R is connected to the latch L, the counter C is connected to the latch L, the switching oscillator FF is connected to the latch L,

[0026] The falling edge of the CLK signal of the counter C resets the flip-flop R. At this time, the flip-flop R outputs a control signal to make the latch L latch the state of the counter C and control the switching frequency of the switching oscillator FF to...

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PUM

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Abstract

The invention relates to a power frequency hopping circuit. Including switching oscillator FF, timing oscillator FC, latch L, counter C and flip-flop R; reset flip-flop R when the output voltage UT of the timing oscillator FC jumps, the falling edge of the CLK signal of counter C Re-set the flip-flop R, at this time the flip-flop R outputs the latch L to latch the state of the counter C, and the output of the flip-flop R generates a control signal to control the switching frequency of the switching oscillator FF to control the switching tube in the switching power supply off and on. The switching power supply and timing control of the present invention adopt two oscillators, and use the jitter of the low-speed oscillator and the cycle counter to count the high-speed oscillator to randomly intercept the state of the counter to realize the scheme of frequency hopping.

Description

technical field [0001] The invention relates to the field of switching power supply control, in particular to a power frequency hopping circuit. Background technique [0002] In the prior art, when switching power supplies with multiple frequencies work on one bus, beat frequency phenomenon is likely to occur, causing large low-frequency fluctuations on the bus and excessive concentration of electromagnetic interference frequency bands. Frequency-hopping spread-spectrum technology has been applied in the field of switching power supplies, and an independent triangular wave is used to control a voltage-controlled oscillator to sweep within a certain range or a pseudo-random timing controller to control jumping between several frequency points. [0003] However, the current existing schemes are relatively complicated and need to be realized by using a pseudo-random sequence generator, a special white noise source or a linear frequency sweep circuit. [0004] Beat frequency ph...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/00
CPCH02M1/00H02M1/0003
Inventor 谭磊
Owner SG MICRO