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Dual-edge constant-turnoff-time modulating voltage type control method and device for switching converter

A constant off-time, switching converter technology, applied in the direction of output power conversion devices, electrical components, etc., can solve problems such as poor steady-state accuracy, achieve short adjustment time, simple control, enhanced system stability and transient The effect of responsiveness

Active Publication Date: 2013-05-01
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with PWM voltage-type control, the transient performance of switching converters using PFM voltage-type control method is good, but the steady-state accuracy is poor

Method used

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  • Dual-edge constant-turnoff-time modulating voltage type control method and device for switching converter
  • Dual-edge constant-turnoff-time modulating voltage type control method and device for switching converter
  • Dual-edge constant-turnoff-time modulating voltage type control method and device for switching converter

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Embodiment 1

[0035] Technical solution ①:

[0036] figure 2 It is shown that a specific embodiment of the present invention is: a double-edge constant off-time modulation voltage control method and its device CFT1 for a switching converter, and its CFT1 device is mainly composed of a voltage detection circuit VS1, an on-time generator ONG1, a sawtooth It consists of wave generator SG1, pulse modulator PM1 and drive circuit DR1. The voltage detection circuit VS1 is used to obtain output voltage information, the on-time generator OFG1 is used to generate variable on-time, the sawtooth wave generator SG1 is used to generate frequency-variable sawtooth waves and sampling pulse signals, and the pulse modulator PM1 is used The control pulse signals for generating constant turn-off, turn-on, and constant turn-off control the turn-off and turn-on of the switch tube of the switching converter TD via the drive circuit DR1.

[0037] image 3 It is shown that the on-time generator ONG1 in this exa...

Embodiment 2

[0053] Figure 13 It shows that the converter TD controlled in this example is a single-transistor forward converter, and the control device of the switching tube S adopts CFT2. It is also proved by simulation that the single-transistor forward converter of the present invention has stable output voltage, high steady-state precision and good load transient performance.

[0054] The method of the present invention can also be used in Buck 2 Converter, dual-transistor forward converter, Cuk converter, Zeta converter, push-pull converter, push-pull forward converter, half-bridge converter, full-bridge converter and other circuit topologies.

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PUM

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Abstract

The invention discloses a dual-edge constant-turnoff-time modulating voltage type control method and a dual-edge constant-turnoff-time modulating voltage type control device for a switching converter. The turnoff and turn-on of a switching tube of the switching converter are controlled according to a relation between an output voltage and a voltage reference value by adopting a control time sequence consisting of constant turnoff, turn-on and constant turnoff or a control time sequence consisting of turn-on, constant turnoff and turn-on. The method and the device can be used for controlling switching converters of multiple topological structures such as a Buck converter, a Buck2 converter, a Cuk converter, a Zeta converter, a single-tube forward converter, a double-tube forward converter, a push-pull converter, a push-pull forward converter, a half-bridge converter, and a full-bridge converter, and have the advantages of no need of any compensation network, easiness in controlling, high transient response speed and high voltage stabilizing accuracy.

Description

technical field [0001] The invention relates to power electronic equipment, in particular to a control method and device for a switching converter. Background technique [0002] In recent years, power electronic device technology and power electronic converter technology have been developing continuously, and switching power supply technology, which is an important field of power electronics, has become a hot spot in application and research. A switching power supply is mainly composed of two parts: a switching converter and a controller. The switching converter is also called the power main circuit, and mainly has various topologies such as buck, boost, buck-boost, forward, flyback, half-bridge, and full-bridge. The controller is used to monitor the working state of the switching converter, and generate a control pulse signal to control the switching tube, and adjust the energy supplied to the load to stabilize the output. For the same switching converter, different contr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/00H02M1/08
Inventor 周国华金艳艳杨平许建平张斐
Owner SOUTHWEST JIAOTONG UNIV
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