Flying capacitor voltage stabilization control method and system of three-level bidirectional buckboost circuit
By obtaining and processing circuit parameters in a three-level bidirectional buckboost circuit, performing PID control, and adjusting the duty cycle of the switch tube, the problem of unsatisfactory voltage stabilization of the flyover capacitor is solved, and effective control of the withstand voltage of the MOS tube is achieved to avoid damage.
CN119727385APending Publication Date: 2025-03-28武汉市蓝电电子股份有限公司
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Patent Information
- Application Number
- CN202411562593.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-05
- Publication Date
- 2025-03-28
AI Technical Summary
Technical Problem
The current three-level bidirectional buckboost circuit has poor cross-capacitor voltage regulation control effect, resulting in the MOS tube voltage withstand voltage exceeding specifications and the risk of damage.
Method used
By obtaining the circuit parameters of the buckboost circuit, performing filtering comparison and PID calculation, obtaining the control voltage, adjusting the duty cycles of the first and second switching tubes, so that the sum of their changes is within the set range, and stable control of the fly capacitance voltage is achieved.
Benefits of technology
Effectively control the voltage of the fly capacitance to stabilize at Vin/2 to avoid damage to the MOS tube. The method is simple and effective, and no additional devices are required.
✦ Generated by Eureka AI based on patent content.
Abstract
The invention discloses a flying capacitor voltage stabilization control method and system for a three-level bidirectional buckboost circuit, and the method comprises the steps: obtaining circuit parameters of the buckboost circuit, carrying out the filtering comparison of the circuit parameters, carrying out the PID operation of the filtered and compared parameters, obtaining a control voltage, controlling the duty ratio of a first switching tube and a second switching tube, which are correspondingly connected, in the buckboost circuit according to the control voltage, and carrying out the voltage stabilization of a flying capacitor in the buckboost circuit. And the sum of the variable quantities of the duty ratios of the first switching tube and the second switching tube is within a set range. According to the buck boost circuit, the buck boost circuit parameters are detected, the duty ratio of the switch tube of the buck boost circuit is controlled in a PID feedback control mode, the voltage of the flying capacitor is controlled to be stabilized at Vin / 2 by adjusting the variable quantity of the duty ratio, and the output voltage is not affected.
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