Frequency converting control method of LLC resonant converter and apparatus thereof

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

Active Publication Date: 2015-10-28
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 converting control method of LLC resonant converter and apparatus thereof
  • Frequency converting control method of LLC resonant converter and apparatus thereof
  • Frequency converting control method of LLC resonant converter and apparatus thereof

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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 , a controlled integrator IC is used to generate the signal V 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 , the signal CC is used to control the reset of the contro...

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 converting control method of an LLC resonant converter and an apparatus thereof. A control voltage generated by an error amplifier based on a reference voltage Vref and an output voltage, an input voltage, and the output voltage are processed by a controlled integrator to obtain signals; and the signals are compared, thereby controlling on / off of a switching tube of the LLC resonant converter. Compared with the voltage type, current type, and charge type PFM-controlled LLC resonant converters, the provided frequency converting control method and apparatus thereof have advantages of simple control loop, high stability and reliability, good anti-interference capability, and fast input and load transient response speed and the like and can be used for controlling various LLC resonant converters like an asymmetric half-bridge LLC resonant converter, a symmetric half-bridge LLC resonant converter, and a symmetric resonant capacitor half-bridge LLC resonant converter and the like.

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 (zero voltage switch, ZVS) or zero current switching (zero current switch, ZCS), which reduces switching loss. The LLC resonant converter has the advantages of both the series resonant converter and t...

Claims

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Application Information

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Patent Type & Authority Applications(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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