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Double-edge constant on-time modulation voltage control method for switching converters

A constant on-time, switching converter technology, applied to electrical components, output power conversion devices, etc., can solve problems such as poor steady-state accuracy, achieve short adjustment time, small transient overshoot, and transient performance Good results

Active Publication Date: 2015-10-14
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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  • Double-edge constant on-time modulation voltage control method for switching converters
  • Double-edge constant on-time modulation voltage control method for switching converters
  • Double-edge constant on-time modulation voltage control method for switching converters

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Embodiment 1

[0039] Technical solution ①:

[0040] figure 2 It is shown that a specific embodiment of the present invention is: a double-edge constant on-time modulation voltage control method for switching converters and its device COT1, and its COT1 device is mainly composed of a voltage detection circuit VS1, an off-time generator OFG1, 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 off-time generator OFG1 is used to generate variable off-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 To generate control pulse signals of constant turn-on, turn-off, and constant turn-on, control the turn-on and turn-off of the switching tube of the switching converter TD through the driving circuit DR1.

[0041] image 3 It is shown that the off-time generator OFG1 in t...

Embodiment 2

[0057] Figure 13 It shows that the converter TD controlled in this example is a single-transistor forward converter, and the control device of the switch tube S adopts COT2. 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.

[0058] 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 switch converter double-edge constant breakover time modulation voltage type control method and a device thereof. According to relation between output voltages and voltage reference value, the switch converter double-edge constant breakover time modulation voltage type control method and the device thereof use a control time series formed by constant breakover, turn-off and constant breakover or a control time series formed by turn-off, constant breakover and turn-off for controlling breakover and turn-off of the switch converter switch tube. The switch converter double-edge constant breakover time modulation voltage type control method and the device thereof can be used for controlling a plurality of switch converters with a topological structure, such as a Buck converter, a Buck2 converter, a Cuk converter, a Zeta converter, a single tube normal shock converter, a double-tube normal shock converter, a push-pull converter, a push-pull normal shock converter, a half-bridge converter and a full-bridge converter. The switch converter double-edge constant breakover time modulation voltage type control method and the device thereof has the advantages of being simple in control, fast in transient response speed, high in voltage stabilization accuracy, and capable of not compensating network.

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, 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 control method...

Claims

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Application Information

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