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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。
Because of the need of insulation, the power supply of high-voltage monitoring equipment can not be directly supplied by the low-voltage side. Therefore, it is necessary to study the power supply technology of high-voltage side, and the stability and long-term power supply requirements of its performance. Taking the induction of electromagnetic induction of current transformer as the foundation, the C8051F021 microcontroller is introduced to construct the power control circuit, and the above problems are attempted from the perspective of improving the power adaptability. The circuit can take part, the overcurrent protection part and the backup power part can be controlled by the single-chip microcomputer through the sampling point signal to be effectively controlled, respectively, to solve a wide range of current changes in a reliable access to energy problems, that is, under high current Over-current protection, as well as under-current power supply problems. This allows the power supply to effectively deal with unstable current conditions, with long-term, stable power performance. The test data of the simulation test proves that the power supply design scheme has certain feasibility and effectiveness.