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DC-DC conversion circuit and control method for variable-period control frequency disturbance

A DC-DC, variable cycle control technology, applied in output power conversion devices, control/regulation systems, DC power input conversion to DC power output, etc., to ensure excellent characteristics, circuit simplicity, and suppress output ripple voltage problems. Effect

Inactive Publication Date: 2015-03-11
TIANJIN HUIGAO MAGNETICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a ripple voltage consistent with the step frequency of the frequency jitter is introduced at the signal output of the entire circuit

Method used

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  • DC-DC conversion circuit and control method for variable-period control frequency disturbance
  • DC-DC conversion circuit and control method for variable-period control frequency disturbance

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Embodiment Construction

[0012] The embodiments of the present invention will be further described in detail below.

[0013] Such as figure 1 , 2 As shown, the control circuit of DC-DC conversion with variable period control frequency disturbance is connected as the direct current U connected to the control system IN After being blocked by diode D1 and filtered by electrolytic capacitor C1, output DC to the D pole of MOS transistor Q1, the cathode of diode D1, the S pole of MOS transistor Q2 and the positive pole of D2, and the S pole of MOS transistor Q1 is connected to the transformer T2. Pin 1 of the input terminal, the D pole of the MOS transistor Q2 is connected to the input pin 2 of the transformer T2, Q1, D1, Q2, D2 and the transformer T2 form a diagonal half-bridge forward circuit topology, and the PWM1 pin of the control chip IC1 is connected to the transformer The input terminal 1 of T1, the GND of the control chip IC1 is connected to the input terminal 2 of the transformer T1, the output ...

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Abstract

The invention relates to a DC-DC conversion circuit and a control method for variable-period control frequency disturbance. The regulation of a duty ratio of a PWM (Pulse-Width Modulation) output control waveform is carried out through sampling the value of an output voltage differential voltage circuit consisting of an R1 and an R2, and a frequency range is set by the system, so that the frequency of the PWM output control waveform simultaneously varies in the range at a non-fixed period, and the DC-DC conversion control of variable-period control frequency disturbance is formed. The DC-DC conversion circuit and the control method have the technical effects that the control system circuit is simple, the method is simple, excellent electromagnetic compatibility properties are ensured, and meanwhile, an output ripple voltage problem caused by frequency disturbance is also inhibited.

Description

technical field [0001] The invention relates to a DC-DC conversion circuit and a control method thereof for periodically controlling frequency disturbances, in particular to a DC-DC conversion circuit and a control method for variable-period control frequency disturbances. Background technique [0002] Since the development of switching power supply technology, with the further increase of pulse width modulation (PWM) control switching frequency, the problem of electromagnetic interference has been brought, especially in the fundamental frequency and multiplier of switching frequency. There will be relatively large electromagnetic interference. Electromagnetic suppression is mostly performed by adding filter circuits, absorbing circuits, etc., which complicates the circuit structure and debugging process. In recent years, people have further reduced the conduction and radiation interference amplitude at the corresponding frequency point by adjusting the switching frequency o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335H02M1/44H02M1/14
CPCH02M3/335H02M1/14H02M1/44
Inventor 周锎任建香杨浩然郑海华陈鸿涛
Owner TIANJIN HUIGAO MAGNETICS