Hipot测试仪系统设计

测试系统具有三个模块：可编程电源模块，信号获取和调理模块和计算机控制系统.

可编程电源模块
It is composed of a programmable power supply with an output of 0V~140V and a high-voltage transformer. Under the control of the single-chip ADCm842, the output voltage of the programmable power supply can be boosted by the transformer to obtain the set output voltage value.

模块设计
由于在实际承受电压测试中可能需要不同的产品可能需要不同的测试电压，因此，必须可调节电压测试系统的输出测试电压必须是可调节的. pWM（脉冲宽度调制）是可调节电压输出的可调节电压输出的主要方法之一，即在{1}}..的重要电源之一。取样控制理论，也就是说，当狭窄的脉冲具有相等的冲动但形状不同的形状被添加到惯性链接中时，效果基本上是相同的. Spwm波形将正弦波替换为相等的振幅脉冲，均等宽度和不平等的宽度.的中点与脉冲的中点相等，并且是平等的脉冲，并且是平等的。区域{.每个脉冲的宽度根据正弦定律.发生变化，有许多方法可以生成Spwm Waves .它们可以通过DEDICATICAT的集成芯片或通用电路组合或单芯片微型计算机来生成单个系统{8}........ {8波，并使用单芯片微型计算机Atmega16L的内部累加器和比较器来调整占空比，以在PC4端口.处输出SPWM波
The programmable voltage source uses a unidirectional 220V industrial frequency AC power to obtain DC voltage through bridge rectification, and after filtering, it provides stable DC power for the inverter circuit. At the same time, the single-phase SPWM wave generated by the single-chip microcomputer passes through the non-gate to generate a SPWM wave with complementary phase to the output of the single-chip microcomputer. These two complementary SPWM waves can generate two phase-complementary gate-level trigger pulse sequences that can be controlled to turn on and off after passing through the monostable circuit and the isolation drive circuit. Finally, the inverter bridge output composed of IGBT can obtain a standard sine wave after low-pass filtering, and the sine电压振幅可调节从0V到140V {.
信号获取和调理模块
包括传感器，信号调节电路和过电流保护循环.测试环的泄漏电流通过传感器.进入信号.在信号获取和调理电路中的信号，并将泄漏电流转换为a/d v converty的泄漏信号{2当测试产品或电路失败{.时被激活