高压侧感应取能电源的研究

Research of Induction Power Supply at High Voltage Side

由于绝缘需要,高压监测设备的电源无法由低压侧直接供给,因此,研究经高压侧取能的供电技术十分必要,而电源供能的稳定性与长期性是对其性能提出的要求。以电流互感器电磁感应取能为基础,引入C8051F021单片机构建电源控制电路,从提高电源自适应能力的角度尝试解决上述问题。该电路的取能部分、过流保护部分及后备电源部分均能由单片机通过对采样点信号进行分析而得到有效控制,可分别解决一次电流宽范围变化下的可靠取能问题,即大电流下的过流保护问题,以及欠电流下的供能问题。这使供电电源能够有效应对不稳定的电流状况,具备长期、稳定供能的性能。模拟试验的测试数据证实该电源设计方案具有一定的可行性与有效性。

Power for high voltage monitoring devices cannot be supplied through secondary side directly because of the requirement of insulation. Hence, technique for obtaining power with stability and sufficient working time through primary side is necessary. On the basis of obtaining energy via electromagnetic induction of current transformer, single chip C8051F021 is adopted to construct a control circuit for improving the adaptability of a power supply, and thus achieving its stability and sufficient working time. The power capture module, over-current protection module and backup power supply module are controlled by the single chip through signal sampling to realize reliable over,current protection and power capture in wide variation of current and in low current. Simulation indicates that this design scheme of power supply is feasible.