In an industrial control device, if a set of thyristor trigger circuits is faulty, it is difficult to accurately determine which part of the device or which group of thyristors has a problem. It is convenient to use the detection circuit as shown in the figure, simple and practical, and can automatically indicate.
When the thyristor trigger pulse is normal, VT1 is turned on, and the charging voltage on C is periodically discharged, so that the 555 pin 2 is always at a low level (<1/3VDD), the 555 is set, and the LED2 (green) light is on; When the silicon-controlled trigger pulse disappears or leaks more, VT1 turns off or turns on less than the original. The charging voltage on C is higher than 2/3VDD, 555 resets, 3 feet are low, LED2 is off, LED1 (red) is on. , indicating a fault.
August 12, 2024
The full name thyratron, commonly known as thyristor, is a bistable power electronic device that contains 3 or more PN junctions that can switch from off-state to on-state or from on-state to...
When the thyristor damage need to check the analysis of the reasons, the core can be removed from the cooling jacket, open the core box and then remove the chip, observe the signs of damage to...
A special sealing device is made by the method of disposing the dust in the radiator. This kind of device only leaves the fan through hole. Go to the construction site and construction site to...
In order to prevent damage to the thyristor caused by the failure of the AC circuit inversion of the thyristor, the traditional method is to use a fast fuse for overcurrent protection. The advantage...
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August 12, 2024
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