继电保护测试仪用高电压功率放大电路的研制

Design of high-voltage power amplifying circuit in protective relay test device

针对继电保护测试仪的电压功率放大采用集成功率放大芯片价格昂贵,且易损坏,提出了一种性价比高、输出功率大的电压功率放大电路设计方案。首先介绍了继电保护测试仪的硬件结构,并详细分析了电压功率放大电路的原理,计算了功率管的管耗,在此基础上对电路进行了仿真分析,最后对实际电路进行了试验,结果表明,电路可输出功率大、线性度好,可以满足测试仪对电压功率放大的技术要求,并且具有很广的应用前景。

Considering voltage power amplifier used in protective relay test device with an integrated power amplifier chip is expensive and easily damaged, this paper proposes a design of voltage power amplifier with cost-effective and high output power. Hardware structure of protective relay test device is introduced and the voltage power amplifier circuit theory is analyzed in detail, then, the power consumption of amplifier tube is calculated. On the basis of above, the simulation analysis of the circuit is made. Finally, the actual circuit is tested, the results show that the circuit is of many advantages, such as high output power and well linearity. In a word, this high-voltage power amplifying circuit meets the technical requirements of the protective relay test device, in addition, has a wide application.