Different vendors currently offer a variety of different power modules in the market, and the input voltage, output power, function and topology of different products are different. It features power for application-specific integrated circuits (ASICs), digital signal processors (DSPs), microprocessors, memories, field-programmable gate arrays (FPGAs), and other digital or analog loads. The reliability of the power module is relatively high, but it may also be faulty. In the DC-DC power module, the following faults may occur:
1. The output voltage of the module is reduced during use;
2, the module stops working;
3. The module output voltage is too high;
4. Module input short circuit;
5. The module output current is too large.
The first two DC/DC faults generally do not pose a great danger and can be detected and alarmed by the fault diagnosis circuit.
The third type of failure is more dangerous. It can burn the application circuit. Generally, the overvoltage protection circuit is used to implement overvoltage protection. In addition, a Zener diode can be added at the output. The design of the diode parameters should be properly selected to prevent changes in the regulation point due to temperature differences. Some modules come with overvoltage protection. Generally speaking, modules below 25W have no overvoltage protection function, and over 25W modules are designed with overvoltage protection circuit. The overvoltage protection point is typically designed to be rated from 135% to 145%. When designing in detail, verify that the module has these features to avoid repetitive design.
The fourth type will cause the input to over-current, and if it is bad, the printed board will be burned. Generally, it can be protected by selecting the appropriate fuse at the input. The fuse is generally placed close to the input end of the power module during wiring. The purpose of the design is to reduce the lead inductance of the input line, and to avoid overvoltage of the input end when the fuse is blown.
The fifth DC/DC power module failure can be selected by selecting a power module with overcurrent protection. The general power module has overcurrent protection function. This module can detect the primary or secondary current of the variator. Realize, but lose some efficiency. When making a voltage module selection, the greater the power rating, the better. If the derating is too large, when the user board assists the short circuit, due to the existence of the transmission voltage drop, the output current is insufficient to achieve over-current of the module, which may cause the chip to overheat or even be damaged.
The power module has several advantages:
â— Each module can be rigorously tested to ensure its high reliability, including power-on testing to eliminate substandard products. In contrast, an integrated solution is harder to test because the entire power system is tied to other functional systems on the circuit.
â— Different suppliers can design modules of the same size according to existing technical standards, providing engineers with different options for designing power supplies.
â— Each module is designed and tested in accordance with standard performance requirements to help reduce the risk of adopting new technologies.
â— If an integrated solution is used, once the power supply system has problems, the entire motherboard needs to be replaced. If the modular design is used, the problem module can be replaced, which can save cost and development time.
Because of the many advantages of modular structure, power modules are widely used in switching equipment, access equipment, mobile communications, microwave communications, optical communications, routers and other communications fields, automotive electronics, aerospace and so on.
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Henan Yongrong Power Technology Co., Ltd , https://www.hnyongrongglobal.com