Rework Power Supply Circuit Board Protection Circuit can also be an effective way to repair medical equipment pcb board repairing;
There is also a part of the circuit block in the power supply circuit board that is mainly used to protect the entire circuit system, called the protection circuit, usually composed of spark gap, varistor and semiconductor.
In order to ensure energy matching, decoupling elements will be added to some circuits in the middle of the multi-level protection circuit. Commonly used protection circuits are:
- In order to prevent the breakdown of the switch tube, the protection circuit specially set is called the spike absorption circuit.
- Overvoltage protection circuit, which is used a lot, can control the voltage in the circuit to be at a normal level through the overvoltage protection circuit, to avoid the rise of the voltage in the line caused by the extension of the switch on time, this protection circuit can not only protect The load in the circuit can also effectively protect the switch tube. In the specific work, the base switch of the switch tube is used to achieve the function of cutting off the switch tube. This cuts off the output of excessive voltage in the switching power supply.
- Undervoltage protection circuit
Overcurrent protection circuit. These two types of protection circuits are also widely used. They are also used to prevent the impact of excessive current in the circuit on the entire circuit. The overall failure rate of the protection circuit is low, but it also needs to be paid attention to and have a certain understanding of it. During the processing of medical instrument circuit board power supply failure, it is usually necessary to disconnect the protection circuit, which helps to better repair the pcb board;
