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Double-edge pulse frequency modulation (PFM) modulation voltage-type control method of output capacitance low equivalent series resistance (ESR) switch convertor and device thereof

A technology for switching converters and output capacitors, which is applied in the field of control methods and devices for switching converters, can solve problems such as the failure of switching converters to work normally, and achieve short adjustment time, small transient overshoot, and transient performance Good results

Active Publication Date: 2015-07-08
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For switching converters with low ESR on the output capacitor, the PWM modulation voltage control method with sawtooth wave and error amplifier will produce low-frequency oscillation, while the PWM modulation voltage control method with RS flip-flop and the traditional PFM modulation voltage control method will produce low-frequency oscillation. Switching converter not working properly

Method used

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  • Double-edge pulse frequency modulation (PFM) modulation voltage-type control method of output capacitance low equivalent series resistance (ESR) switch convertor and device thereof
  • Double-edge pulse frequency modulation (PFM) modulation voltage-type control method of output capacitance low equivalent series resistance (ESR) switch convertor and device thereof
  • Double-edge pulse frequency modulation (PFM) modulation voltage-type control method of output capacitance low equivalent series resistance (ESR) switch convertor and device thereof

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Embodiment 1

[0027] figure 1 As shown, a specific embodiment of the present invention is: output capacitance low ESR switching converter dual edge PFM modulation voltage type control method and its device DEF, its DEF device is mainly composed of current detection circuit IS, voltage detection circuit VS, adder ADD, voltage controller VCM, time operator TM, control timing generator CP, and drive circuit DR. The voltage detection circuit VS is used to obtain the output voltage information, the current detection circuit IS is used to obtain the current information flowing through the output capacitor without affecting the output voltage ripple, and the voltage controller VCM is used to generate the voltage control signal V c , the time operator TM is used to generate variable time, and the control sequence generator CP generates a control sequence consisting of constant on, off, and constant on or composed of on, constant The control sequence consisting of turn-off and turn-on controls the ...

Embodiment 2

[0039] The present invention adopts the signal flowchart of embodiment two method also as figure 1 As shown, the specific implementation method is: the voltage detection circuit VS is used to obtain the output voltage information, the current detection circuit IS is used to obtain the current information flowing through the output capacitor without affecting the output voltage ripple, and the voltage controller VCM is used for to generate the voltage control signal V c , the time operator TM is used to generate variable time, and the control sequence generator CP generates a control sequence consisting of constant off, on, and constant off or composed of off, constant The control sequence composed of turn-on and turn-off controls the turn-off and turn-on of the switching tube of the switching converter TD via the drive circuit DR.

[0040] Image 6 Signal V when the present invention adopts the second method of embodiment os , voltage control signal V c , on-time, off-time...

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Abstract

The invention discloses a double-edge pulse frequency modulation (PFM) modulation voltage-type control method of an output capacitance low equivalent series resistance (ESR) switch convertor and a device thereof. Currents flowing through an output capacitance are detected under conditions of no affecting output voltage ripple. A current detecting signal ic is obtained. Meanwhile, an output voltage is measured, and an output voltage detecting signal Vo is obtained. The current detecting signal and the output voltage detecting signal are counted up to obtain a signal Vos. Variable time is generated by a voltage control signal Vc and the signal Vos through a time arithmetical device. The variable time is combined presupposed constant time. A control time sequence composed of the constant time and the variable time is further produced through a control time sequence builder. Conduction and turn-off of a switch pipe of switch convertors are controlled by the control time sequence. The double-edge PFM modulation voltage-type control method of the output capacitance low ESR switch convertor and the device thereof can be used for controlling switch convertors with various such as a Buck convertor, a Buck 2 convertor, a Cuk convertor and a Zeta convertor and has the advantages of being low ripple in output voltage and no low frequency oscillation in output voltage, wide in stable range, quick in transient response speed and high in voltage stabilization 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 Patents(China)
IPC IPC(8): H02M1/08
Inventor 周国华杨平沙金许建平
Owner SOUTHWEST JIAOTONG UNIV
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