How to detect high voltage silicon stack?

A single silicon diode has limited voltage resistance, so many of them are connected in series in a device, which serves as a high-voltage rectifier element. This is called a high-voltage silicon stack, which is equivalent to a single diode in a high-voltage circuit. 

The high-voltage silicon stack is composed of multiple high-voltage rectifier diodes connected in series. When testing, the forward and reverse resistance values ​​can be measured with the R×10K range of the multimeter. For a normal high-voltage silicon stack, its forward resistance value is greater than 200KΩ, and its reverse resistance value is infinite. If a certain resistance value is measured in both the forward and reverse directions, it means that the high-voltage silicon stack has been soft-broken and damaged.

Another method is: the high-voltage silicon stack has a rectification function. After the multimeter range switch is turned to the DC voltage range of 250V or 500V, the high-voltage silicon stack is connected in series and connected to the 220V AC power supply. Due to the rectification effect of the high-voltage silicon stack, the deflection of the multimeter pointer reflects the average current after half-wave rectification. Therefore, the high-voltage silicon stack and the multimeter constitute a half-wave rectification AC voltmeter.

When the high-voltage silicon stack to be tested is connected in the forward connection method, the multimeter reading is above 30V, which is qualified. When connected in the reverse connection method, the multimeter pointer should deflect in the reverse direction. If the multimeter pointer does not move, it may be that the high-voltage silicon stack is short-circuited internally. So that the current cannot pass through the multimeter. But it may also be that the high-voltage silicon stack has broken down. Although the AC voltage can be directly applied to the multimeter during a short circuit, due to the AC frequency of 50HZ, the multimeter pointer does not have time to swing, so the multimeter with the range switch set to the DC voltage position is always at zero.

Therefore, to determine whether the high-voltage silicon stack is short-circuited or open-circuited, just turn the multimeter's range switch to the AC voltage 250V or 500V. If the reading is 220V AC voltage, it proves that the high-voltage silicon stack being tested is short-circuited. If the reading is 0 at this time, it indicates that the high-voltage silicon stack has been short-circuited.

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