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Closed-loop control system for LLC half-bridge resonance converter and system-control method

A resonant converter and control system technology, applied in the control/regulation system, the irreversible DC power input is converted into AC power output, the AC power input is converted into DC power output, etc., which can solve the problem of unstable output voltage, resonance tank The problems of large circuit current and high cost of control circuit can achieve the effect of strong adaptability and robustness, less model dependence, and improved work efficiency.

Inactive Publication Date: 2017-02-22
福建省诺希科技园发展有限公司 +1
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  • Abstract
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  • Application Information

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Problems solved by technology

[0005] However, there are many problems in the switching converters in the market today, mainly in: the design of resonance parameters in the resonant tank is complicated, the leakage inductance of the transformer needs to be properly handled, the current in the resonant tank is large and the loss is serious when the conventional frequency conversion PFM control is no-load , short-circuit protection, etc. are difficult to solve, the dynamic response of the converter is slow, the cost of the control circuit is high, the output efficiency is low, the output voltage is unstable, etc.

Method used

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  • Closed-loop control system for LLC half-bridge resonance converter and system-control method
  • Closed-loop control system for LLC half-bridge resonance converter and system-control method
  • Closed-loop control system for LLC half-bridge resonance converter and system-control method

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Embodiment Construction

[0036] The technical solution of the present invention will be specifically described below in conjunction with the accompanying drawings.

[0037] A closed-loop control system of a half-bridge LLC resonant converter of the present invention, such as figure 1 As shown, it includes main circuit input power supply (DC power supply) 11, switch module 12, resonant network module 13, transformer 14, rectification filter circuit module 15, load 16, voltage divider module 21, PID control system 31, VCO 32, drive circuit module 22 , a reference voltage module 41 , and an inverter 42 .

[0038] Further, in this embodiment, as Figure 2~3 As shown, the main circuit input power supply 11 is a DC power supply, which is converted into a square wave by the switch module 12 as the input of the resonant circuit; the switch module 12 is composed of two complementary conduction switch tubes, forming a half-bridge structure ; The resonant network module 13 is made up of a resonant inductance a...

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Abstract

The invention relates to a closed-loop control system for a LLC half-bridge resonance converter and a system-control method thereof. The closed-loop control system comprises an input power of a main circuit, a switch module, a resonant network module, a transformer, a rectification circuit block, a filter circuit module, a load, a control system of PID, and a voltage controlled oscillator (VCO). The closed-loop control method comprises the steps of: starting the control system of PID by an unstable output voltage signal, adjusting the output voltage, and stabilizing the output voltage. According to the closed-loop control system and the system-control method, the output voltage is adjusted by changing the operating frequency of the LLC half-bridge resonance and the closed-loop controls are associated, therefore the voltage of the LLC half-bridge resonance is steady to increase working efficiency when a switching tube works in a reasonably frequency range.

Description

technical field [0001] The invention relates to the technical field of control of a half-bridge LLC resonant converter, in particular to a closed-loop control system and a control method of a half-bridge LLC resonant converter. Background technique [0002] The 21st century is an era of informatization. The rapid development of informatization makes people more and more dependent on electronic equipment and products, and these electronic equipment and products are inseparable from power supplies. Compared with linear power supplies, switching power supplies have advantages in terms of efficiency, volume, and weight. Especially, high-frequency switching power supplies are becoming lighter, smaller, more efficient, and more reliable, which makes high-frequency switching power supplies the most widely used. Wide range of power supplies. From the perspective of the composition of the switching power supply, it is mainly composed of two parts: power stage and control stage. The...

Claims

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Application Information

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IPC IPC(8): H02M3/335H02M7/48
CPCH02M3/33523H02M7/48H02M7/4818Y02B70/10
Inventor 金涛沈学宇刘对刘思议
Owner 福建省诺希科技园发展有限公司
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