Driving method of symmetrical half-bridge LC series resonance sine power conversion circuit

A symmetrical half-bridge and conversion circuit technology, applied in the field of DC conversion, can solve problems such as weak transient response capability and weak soft switching characteristics of transistors, and achieve strong transient response capability, good load supply voltage stability, and voltage stability Good results

Active Publication Date: 2020-12-04
扬州船用电子仪器研究所
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the prior art, the output gain of the half-bridge series resonant conversion circuit is usually affected by the load condition, especially in an open-loop control environment, the transient response capability of the half-bridge series resonant conversion circuit is weak, and the softness of the transistor Weak switching characteristics

Method used

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  • Driving method of symmetrical half-bridge LC series resonance sine power conversion circuit
  • Driving method of symmetrical half-bridge LC series resonance sine power conversion circuit
  • Driving method of symmetrical half-bridge LC series resonance sine power conversion circuit

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Effect test

Embodiment 1

[0040] The following combination Figure 1 to Figure 3 This embodiment will be described.

[0041] Through the driving method of the symmetrical half-bridge LC series resonant sinusoidal power conversion circuit in this embodiment, the symmetrical half-bridge converting circuit generates a high-frequency constant-width chopping voltage, which is connected by a resonant capacitor, a resonant inductor and a high-frequency The resonant tank circuit formed by the primary series connection of the transformer is controlled by the sinusoidal conversion controller, so that the frequency of the resonant tank circuit, the chopping voltage and the secondary synchronous rectification are matched, and in the resonant tank circuit, a circuit with the same phase and frequency as the chopping voltage is formed. The sine wave resonant current realizes the soft switching of two half-bridge transistors and four synchronous rectification transistors, and also maintains the gain constant of the co...

Embodiment 2

[0066] The following combination Figures 4 to 6 The second embodiment will be described.

[0067] The second embodiment shows an implementation of a sinusoidal transformation controller, such as Figure 4 As shown, the sinusoidal conversion control circuit 15 includes a pulse width controller 151, a gate driver 152 and an isolation transformer 153 connected in sequence, and the sinusoidal conversion control circuit 15 also includes: a first drive circuit and a second drive circuit, wherein the first drive The circuit is arranged at the first output end of the sinusoidal transformation control circuit 15, and the second driving circuit is arranged at the second output end of the sinusoidal transformation control circuit 15;

[0068] The output end of the pulse width controller 151 is connected to the input end of the gate driver 152, and the pulse width controller 151 is used to input a control signal to the gate driver 152;

[0069] Specifically, the pulse width controller 15...

Embodiment 3

[0092] The following is attached Figures 7 to 10 The third embodiment will be described.

[0093] This embodiment provides a driving method for a symmetrical half-bridge LC series resonant sinusoidal power conversion circuit, which is suitable for the circuits in the first and second embodiments above. The above-mentioned circuits are driven by the driving method in this embodiment. Methods include:

[0094] Step S1, connecting an LC series resonant circuit in series between the primary end of the high-frequency transformer and the symmetrical half-bridge circuit;

[0095] Step S2, determining the switching frequency of the symmetrical half-bridge sinusoidal power conversion circuit according to the resonant angular frequency of the LC series resonant circuit;

[0096] In step S3, according to the switching frequency, a transistor turn-on instruction is sent to the symmetrical half-bridge sinusoidal power conversion circuit, and the transistor turn-on instruction is used to...

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PUM

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Abstract

The invention discloses a driving method of a symmetrical half-bridge LC series resonance sine power conversion circuit. The driving method comprises the steps: S1, connecting a LC series resonance circuit between the primary end of a high-frequency transformer and a symmetrical half-bridge circuit in series; S2, determining the switching frequency of a symmetrical half-bridge sine power conversion circuit according to the resonance angular frequency of the LC series resonance circuit; and S3, according to the switching frequency, sending a transistor conduction instruction to the symmetricalhalf-bridge sine power conversion circuit, wherein the transistor conduction instruction is used for controlling the conduction or disconnection of a transistor in the symmetrical half-bridge sine power conversion circuit. According to the technical scheme, a symmetrical half-bridge circuit generates a fixed-width chopping voltage, so that a resonant tank circuit, the chopping voltage and the frequency of secondary synchronous rectification are matched, the voltage gain of a conversion circuit is kept constant under different load conditions, and the symmetrical half-bridge series resonance sine power conversion function is achieved.

Description

technical field [0001] The present application relates to the technical field of DC conversion, in particular, to a driving method for a symmetrical half-bridge LC series resonant sinusoidal power conversion circuit. Background technique [0002] With the rapid development of electronic equipment, the power density requirements of DC converters in the field of DC conversion technology are getting higher and higher. In order to reduce the size of passive components such as inductors and capacitors, the operating frequency of DC converters is also getting higher and higher. , in the high-frequency working mode, the soft switching of the converter is particularly important, and the resonant converter is a typical form of the soft switching converter. [0003] As early as the 1960s, the book "Principles of Inverter Circuits" by B.D.Bedford and R.G.Hoft proposed the concept of resonant converters. Resonant converters have been proposed and now have various deformed topologies, wh...

Claims

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Application Information

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IPC IPC(8): H02M3/335
CPCH02M3/33592H02M1/0058Y02B70/10
Inventor 高彧博程立李群谢章贵段崇嵩
Owner 扬州船用电子仪器研究所
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