Frequency conversion control method and device for llc resonant converter

A resonant converter, frequency conversion control technology, applied in the direction of output power conversion device, control/regulation system, DC power input conversion to DC power output, etc., can solve the problem of large converter size, complex control circuit structure, dynamic response speed, etc. Slow down and other problems, to achieve the effect of good system stability, high load transient response performance, and simplified design

Active Publication Date: 2017-11-14
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The voltage-type PFM control LLC resonant converter includes a voltage-controlled oscillator, and the control loop is composed of a single voltage loop, and the dynamic response speed is slow; the current-type and charge-type PFM control LLC resonant converter samples the primary resonant inductor current and then passes it through the rectifier circuit To convert AC signals into DC signals, the structure of the control circuit is complex, and the volume of the converter is large

Method used

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  • Frequency conversion control method and device for llc resonant converter
  • Frequency conversion control method and device for llc resonant converter
  • Frequency conversion control method and device for llc resonant converter

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Embodiment 1

[0024] figure 1 It is shown that a specific embodiment of the present invention is: LLC resonant converter TD frequency conversion control method and its device, the device is mainly composed of the first voltage detection circuit VS1, the second voltage detection circuit VS2, the error amplifier EA, the controlled integral Comparator IC, comparator CMP, logic circuit LC, first drive circuit DR1 and second drive circuit DR2. The first voltage detection circuit VS1 is used to obtain the output voltage information and obtain the signal V os , the second voltage detection circuit VS2 is used to obtain the input voltage information and obtain the signal V is , the error amplifier EA is used to generate the control voltage V c , the controlled integrator IC is used to generate the signal V after integrating the input voltage and output voltage s , the comparator CMP is used to generate the signal V p , the logic circuit is used to generate the pulse signal CC, VG 1 and VG 2 ,...

Embodiment 2

[0035] Such as Figure 7 As shown, the second embodiment of the present invention is basically the same as the first embodiment, except that the converter TD controlled in this example is a symmetrical half-bridge LLC resonant converter.

[0036] In addition to the switching converters in the above embodiments, the method of the present invention can also be used in LLC circuit topologies such as symmetrical resonant capacitor half-bridge LLC resonant converters.

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Abstract

The invention discloses a frequency conversion control method and device for an LLC resonant converter. The control voltage generated by the reference voltage Vref and the output voltage through the error amplifier is compared with the signal obtained by the input voltage and the output voltage through the controlled integrator, and the control LLC resonant converter switch on and off. Compared with voltage-type, current-type and charge-type PFM controlled LLC resonant converters, the present invention has the advantages of simple control loop, good stability, high reliability, strong anti-interference ability, fast input and load transient response speed, etc., and can be used It is suitable for controlling various LLC resonant converters, such as: asymmetrical half-bridge LLC resonant converter, symmetrical half-bridge LLC resonant converter, symmetrical resonant capacitor half-bridge LLC resonant converter, etc.

Description

technical field [0001] The invention relates to power electronic equipment, in particular to a control method and device for an LLC resonant converter. Background technique [0002] In recent years, high frequency, high efficiency and high power density have become a development trend of switching power supplies. For traditional converters based on pulse width modulation (PWM), the switching devices work in a hard switching state. As the switching frequency increases, the switching loss will increase sharply, reducing the efficiency of the converter, which limits the switching frequency and Further increase in power density. The resonant converter uses a resonant element to make the switching voltage or current cross zero periodically, thereby realizing zero voltage switching (ZVS) or zero current switching (ZCS), which reduces switching losses. The LLC resonant converter has the advantages of both the series resonant converter and the parallel resonant converter. In a wid...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/335
CPCY02B70/10Y02P80/10
Inventor 周国华周述晗刘啸天冷敏瑞
Owner SOUTHWEST JIAOTONG UNIV
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