What are the common faults of dc to dc step up converter?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. The power module 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. Although the power module is highly reliable, it may sometimes malfunction. Below we summarize several common faults of DC/DC power modules.
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 parameters of the diode should be properly selected during design to prevent changes in the regulation point due to different temperatures. Some modules come with overvoltage protection. Generally speaking, the module below 25W has no overvoltage protection function, and the internal design of the module above 25W has an overvoltage protection circuit. Overvoltage protection points are 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 end. 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 overcurrent of the module, which may cause the chip to overheat or even be damaged.