摘要：【中文】本发明涉及一种恒功率输出电源的过压保护电路，包括控制器电路、比较电路以及报警电路；控制器电路设置有用于接收恒功率输出电源的输出电流的第一输入端，用于根据恒功率输出电源的输出电流确定对应的电源过压保护阈值；比较电路的第一输入端用于接收恒功率输出电源的输出电压，比较电路的第二输入端用于连接控制器电路的输出端以接收电源过压保护阈值，比较电路的输出端控制连接报警电路用于在恒功率输出电源的输出电压大于电源过压保护阈值时进行报警。本发明可以使恒功率输出电源的电源过压保护阈值随着输出电流的调整而自动进行调整，有效避免了电源因为电压过大而损坏，提高了恒功率输出电源过压保护的灵活可靠性。 【EN】The invention relates to an overvoltage protection circuit of a constant-power output power supply, which comprises a controller circuit, a comparison circuit and an alarm circuit, wherein the controller circuit is connected with the comparison circuit; the controller circuit is provided with a first input end for receiving the output current of the constant-power output power supply and is used for determining a corresponding power supply overvoltage protection threshold value according to the output current of the constant-power output power supply; the first input end of the comparison circuit is used for receiving the output voltage of the constant-power output power supply, the second input end of the comparison circuit is used for being connected with the output end of the controller circuit so as to receive the power supply overvoltage protection threshold value, and the output end of the comparison circuit is connected with the alarm circuit in a control mode and used for giving an alarm when the output voltage of the constant-power output power supply is larger than the power supply overvoltage protection threshold value. The invention can automatically adjust the power supply overvoltage protection threshold value of the constant power output power supply along with the adjustment of the output current, effectively avoids the damage of the power supply due to overlarge voltage, and improves the flexible reliability of the constant power output power supply overvoltage protection.