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Switching converter double pulse frequency modulation V<2> type control method and device thereof

A pulse frequency modulation, switching converter technology, applied in the direction of output power conversion devices, electrical components, etc., can solve the problems affecting the stability of the converter, and achieve good system stability, small transient overshoot, and improved transient performance. The effect of state performance

Active Publication Date: 2015-03-25
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, conventional PWM modulation of V 2 When the duty cycle is greater than 0.5, sub-harmonic oscillation will occur in the control method, which seriously affects the stability of the converter.

Method used

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  • Switching converter double pulse frequency modulation V&lt;2&gt; type control method and device thereof
  • Switching converter double pulse frequency modulation V&lt;2&gt; type control method and device thereof
  • Switching converter double pulse frequency modulation V&lt;2&gt; type control method and device thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] figure 1 Shown, a specific implementation of the present invention is: switching converter dual-edge pulse frequency modulation V 2 Type control method and its device V 2 PFM, its V 2 - The PFM device is mainly composed of a voltage detection circuit VS, a controlled error compensator VEC, a time operation unit TU, a variable frequency sawtooth wave generator SG, a double edge pulse modulator DPM and a driving circuit DR. The voltage detection circuit VS is used to obtain the output voltage value V os , the controlled error compensator VEC is used to generate the control voltage V c , the time operation unit TU is used to generate three periods of time t 1 , t 2 , t 3 , the variable frequency sawtooth wave generator SG is used to generate variable frequency sawtooth wave V saw and the sampling pulse signal CLK, the double-edge pulse modulator DPM is used to generate t 1 , t 2 , t 3 The timing control pulse signal controls the turn-on and turn-off of the switch...

Embodiment 2

[0042] Figure 7 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 V 2 PFM. Figure 8 In Embodiment 2 of the present invention, output voltage, control voltage V c , time t 1 , time t 2 , time t 3 , a schematic diagram of the relationship between the sampling pulse signal CLK and the driving signal.

[0043] The specific working process and principle are: Figure 7 , Figure 8 It shows that the switching tube is turned off at any starting moment of the sampling pulse signal CLK, and at the same time, the voltage detection circuit VS detects the output voltage of the converter TD to obtain the output voltage value V os , and with reference voltage V ref It is sent to the controlled error compensator VEC to generate the control voltage V c . preset a constant off-time T OFF , t 1 , t 3 Same as off time and satisfy t 1 +t 3 =T OFF , then t 2 is the turn-on time...

Embodiment 3

[0046] Such as Figure 9 As shown, this example is basically the same as Embodiment 1, the difference is: the converter TD controlled by this example is Buck 2 converter.

[0047] The inventive method can also be used for double-tube forward converter, Cuk converter, Zeta converter, push-pull converter, push-pull forward converter, half-bridge converter except being applicable to the switching converter in the above embodiment. , full-bridge converter and other circuit topologies.

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Abstract

The invention discloses a switching converter double pulse frequency modulation V<2> type control method and a device thereof. According to the relationship between a control voltage Vc generated by the fact that a reference voltage Vref and an output voltage Vos pass through an error compensator and the output voltage Vos, preset constant-on-time or constant-off-time is combined, three sections of time t1, t2 and t3 are generated, each period sequentially adopts a control timing sequence formed by the t1, the t2 and the t3, and switch-on and switch-off of a switching tube of a switching converter are controlled. The method and the device can be used for controlling 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, a full-bridge converter and other switching converters in various topological structures. The device has the advantages that load transient response speed is high, voltage stabilizing precision is high, and stabilizing performance is good.

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, with the continuous development of power electronic devices and power electronic converter technology, switching power supply technology, as 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, converters using different control...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/08
Inventor 周国华金艳艳何圣仲许建平
Owner SOUTHWEST JIAOTONG UNIV
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