Improvement of energy recovery circuit in pulsed power system
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摘要: 串联型能量回收电路从电路结构上保证了异常条件下脉冲功率系统中充电电源的安全，但恒流充电电源经回收电感向储能电容充电时会引起回收电路的振荡，不仅会造成充电电源输出过压和回收电感损耗增加，还会导致充电电压一致性明显变差等问题。在分析了回收电路振荡特性的基础上，提出了在回收电感两端并接旁路开关和双路充电输入的电路结构以及相应的充电控制方法，不仅可以抑制回路振荡从而提高充电一致性，还可以消除回收电感和旁路开关的不必要损耗且控制方法也简单通用。对包含有串接型回收电路的600 V/400 A充电系统进行了电路仿真和实验验证，实验结果表明：在600 V重频条件下，回收电路的改进方案可将储能电容电压的充电一致性偏差由10 V降低到2.6 V，对应的相对偏差由1.7%降低到0.5%以内。Abstract: Series type energy recovery circuit guarantees the safety of charging power supply in pulse power system under abnormal conditions relying on circuit structure, but oscillation of recovery circuit will occur when the load capacitor is charged via recovery inductor by constant current charging power supply, which will not only cause the overvoltage of charging power supply and increase the loss of recovery inductance, but also lead to obvious deterioration of voltage consistency. Based on the analysis of the oscillation characteristics of the recovery circuit, the structure of the bypass switch connected with the recovery inductor and the double input for recovery circuit and the corresponding charging control method are proposed. It can not only suppress the oscillation of the circuit to improve the charging voltage consistency, but also significantly reduce the unnecessary loss of the recovery inductor and the bypass switch, besides, the control method is simple and universal. The circuit simulation and the experiment were carried out on a 600 V/400 A charging system with a series type recovery circuit, and the experimental results show that with the improved recovery circuit, the consistency deviation of the load capacitor voltage is reduced to 2.6 V from 10 V, and the relative deviation is reduced to 0.5% from 1.7% under the condition of 600 V pulse repetition.
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图 1 采用不同类型回收电路的脉冲功率系统电路示意图
Figure 1. Schematic diagram of pulse power system circuits with different types of recovery circuit
图 2 串联型回收电路的简化电路和工作波形示意图
Figure 2. Simplified circuit and waveform diagram of series type recovery circuit
图 3 改进方案1的电路结构和工作波形示意图
Figure 3. Schematic diagram of circuit structure and working waveform of improved scheme 1
图 4 改进方案2的电路结构和工作波形示意图
Figure 4. Schematic diagram of circuit structure and working waveform of improved scheme 2
图 5 改进方案3的电路结构和工作波形示意图
Figure 5. Schematic diagram of circuit structure and working waveform of improved scheme 3
图 6 回收电路不同方案下的电路仿真波形
Figure 6. Circuit simulation waveforms under different schemes of recovery circuit
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