3500W High Frequency Inverter

HMII series high frequency inverter 3500w 5500w

Protect the Circuit:

Since there are some unstable factors in the power supply circuit, the circuit designed to prevent such unstable factors from affecting the circuit performance is called a protection circuit. For example, there are overcurrent protection, overvoltage protection, overheating protection, no-load protection, short circuit protection, etc.

In the power supply system, the most likely faults are short circuit, overload, grounding and lightning strike. In order to ensure the safe and reliable operation of the power supply system, protection devices must be installed to monitor the working conditions of the power supply system, detect faults in time and cut off the power supply of the faulty equipment to prevent the expansion of accidents. The protection circuit is generally composed of various relays, signal indicating devices and other components.

When selecting power electronic switching devices, a certain margin should be reserved to ensure the safe and reliable use of the devices. At the same time, there must be a protection circuit to prevent the device from being damaged due to failure. The protection circuit mainly includes overcurrent protection, overvoltage protection and overheating protection.

Overcurrent Protection

Overcurrent protection is achieved by placing fast fuses in series in the circuit and is suitable for thyristors and GTOs because of their high inrush current capability. For MOSFETs, GTRs, and IGBTs, due to their low ability to withstand overcurrent, there must be a special overcurrent protection circuit, and the overcurrent protection circuit is required to complete overcurrent detection, signal transmission, and protection actions in a microsecond time. The current is limited within the overload capacity. Currently commonly used methods are: monitoring method, Hall current sensor protection method.

Overvoltage protection

A variety of reasons can cause overvoltages in power electronic circuits, such as switching off of switching devices, switching on and off of power switches, etc. Due to the existence of parasitic inductance in the circuit, the sudden change of current caused by various reasons will generate voltage spikes, resulting in overvoltage. Varistor is the main method to realize overvoltage protection, mainly including varistor and anti-lightning transient voltage suppressor. When the terminal voltage exceeds a certain value, the varistor will decrease sharply, thereby suppressing the transient overvoltage.

Overheating protection

Power electronic switching devices will consume power during operation, such as conduction loss, switching loss, etc. These losses are converted into heat, which will increase the junction temperature of the device, resulting in abnormal operation of the device and even damage to the device. Therefore, when the device is working, the heat generated must be dissipated in time to ensure that the temperature of the device is within a suitable range. This is the main content of heat dissipation design, which is an important part of power electronic circuit design.

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