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Double-edge modulation output voltage control method and device of boost converter

A technology of output voltage control and output voltage, applied in output power conversion devices, DC power input conversion to DC power output, control/regulation systems, etc., can solve low-frequency oscillation, sub-harmonic oscillation, and slow transient response speed and other problems, to achieve the effect of simple control, simplified design, and fast load response speed

Pending Publication Date: 2019-05-21
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The average current control improves the current control accuracy and has strong anti-interference, but the load transient response speed is slower than the peak current control and valley current control; V 2 The control improves the load response speed, but sub-harmonic oscillation or low frequency oscillation still occurs when the duty cycle is greater than 0.5

Method used

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  • Double-edge modulation output voltage control method and device of boost converter
  • Double-edge modulation output voltage control method and device of boost converter
  • Double-edge modulation output voltage control method and device of boost converter

Examples

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Embodiment 1

[0032] figure 1It is shown that a specific embodiment of the present invention is: a boost converter double-edge modulation output voltage control method and its device, including a voltage detection circuit VS, a duty cycle generator DM, a triangle wave generator TG, a comparator COM And the drive circuit DR; the voltage detection circuit VS is used to obtain the output voltage information V of the boost converter o , the duty cycle generator DM is used to generate the duty cycle control signal D n , the triangular wave generator TG is used to generate the triangular carrier signal V tra , the comparator COM is used to generate the duty cycle signal V d , the driving circuit DR is used to generate the driving control signal V p , to control the turn-on and turn-off of the TD switch tube of the boost converter.

[0033] Its working process is, the V o and preset reference voltage value V ref Input to the duty cycle generator, combined with the preset constant value K 1 ...

Embodiment 2

[0044] Such as Figure 9 As shown, this example is basically the same as the first example, except that the converter TD controlled in this example is a quadratic Boost converter.

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PUM

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Abstract

The invention discloses a double-edge modulation output voltage control method and device of a boost converter. The method comprises the following steps: sampling an output voltage at a starting moment of each switching cycle, and inputting the output voltage and a reference voltage value into a duty ratio generator to generate a duty ratio control signal Dn; comparing a triangular carrier signalVtra with the duty ratio control signal to generate a duty ratio signal Vd; and then inputting the duty ratio signal into a driving circuit to generate a switching tube driving signal, adopting one turn-on time and two turn-off times, and controlling the turn-off and the turn-on of a switching tube of the boost converter within each cycle by adopting a control time sequence composed of turn-off, turn-on and turn-off in sequence. The double-edge modulation output voltage control method and device disclosed by the invention can be used for controlling boost switching converters such as Boost converters, secondary Boost converters and the like, and have the beneficial effects that no compensation network is required, the control is simple, the precision is relatively high, stable work can beperformed within the entire duty ratio range, no subharmonic oscillation is generated, and the transient response speed is high.

Description

technical field [0001] The invention relates to the field of power electronic equipment, in particular to a method and device for controlling the double-edge modulation output voltage of a step-up converter. Background technique [0002] With the development of power electronic technology, power electronic devices are more and more widely used in various electrical devices, and users have higher and higher requirements for the stability and transient performance of power electronic devices. As a common switching converter, the boost converter is often used in various power supply circuits. [0003] The control method of the step-up converter is divided into variable frequency control and fixed frequency control. Compared with variable frequency control, the boost converter with fixed frequency control has a fixed operating frequency, easy filter design, high heavy-duty efficiency, and good voltage stabilization accuracy. In fixed frequency control, the most commonly used i...

Claims

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Application Information

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IPC IPC(8): H02M3/156H02M3/157
Inventor 毛桂华周国华
Owner SOUTHWEST JIAOTONG UNIV
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