CSC策略控制的四开关buck-boost电路具有小电感电流有效值，降低导通损耗，零电压开通等优点，但MPPT应用下传统的CSC控制的四开关buck-boost电路具有输入负阻特性，与光伏的输出阻抗不匹配，容易引起输入电压的震荡，影响电路的稳定性。通过小信号分析，改进后的CSC策略控制下的四开关buck-boost电路的输入阻抗变为正阻，消除输入电压的震荡现象，保证了电路稳定。

The four switches buck-boost circuit controlled by CSC strategy has the advantages of small RMS value of inductor current, reduced conduction loss and ZVS on operation, etc. However, the four switches buck-boost circuit controlled by CSC in MPPT application has the negative input impedance, which affects the stability of input voltage. The improved CSC algorithm eliminates the oscillation of input voltage and ensures the stability of the circuit.

• 输入电压范围: 210Vdc-310Vdc
• 输出电压范围: 210Vdc-310Vdc
• 满载效率: 98.9%@400W
• 四开关buck-boost、CSC控制

• Input voltage Range: 210Vdc-310Vdc
• Output Voltage Range: 210Vdc-310Vdc
• Full Load Efficiency: 98.9%@400W
• Four switches buck-boost, current shaping control

1.实验样机

2.改进CSC策略框图