DSMB-01C 有两个独立的控制器分支 用于处理和诊断信号

DSMB-01C 有两个独立的控制器分支 用于处理和诊断信号

尽管电源模块的可靠性比较高，但也可能发生故障，在dc/dc模块中，一般可能发生的故障有以下几种：
1、模块在使用过程中输出电压降低；
2、模块停止工作；
3、模块输出电压过高；
4、模块输入短路；
5、模块输出电流过大。
前两种dc/dc故障一般不会带来很大危险，可以故障诊断电路检测并报警。
第三种失效方式比较危险，它可以烧毁应用电路，一般通过过压保护电路来实现过压保护，另外也可以在输出端加稳压二极管来实现。设计时要合理选择二极管的参 数，防止由于温度不同造成稳压点的变化。有些模块本身自带过压保护。一般来讲，25w以下模块无过压保护功能，25w以上模块内部设计有过压保护电路。过 压保护点一般设计为135]－－145]额定电压。详细设计时要确认模块是否具有这些功能，以免重复设计。
第四种会导致输入过流，严重时烧坏印制板，一般可以通过在输入端选择合适的保险管进行保护。保险管在布线时一般要布置在靠近电源模块的输入端，这样设计的目的是降低输入线的引线电感，避免保险管熔断时，引线电感引起输入端的过压。
第五种dc/dc故 障可以通过选择带有过流保护的电源模块，一般的电源模块都有过流保护功能，这种模块在其内部可以通过检测变化器原边或副边电流来实现，但要损失一定的效 率。在进行电压模块选择时，不是功率额定越大越好。如果降额过大，则用户板辅助短路时，由于传输压降的存在，输出电流不足以实现模块过流，有可能引起芯片 过热甚至损坏。
 

DSMB-01C 有两个独立的控制器分支 用于处理和诊断信号

Although the reliability of the power module is relatively high, it may also fail. In the dc/dc module, the following types of faults may occur:
1. The output voltage of the module is reduced during use;
2, the module stops working;
3, module output voltage is too high;
4, module input short circuit;
5, the module output current is too large.
The first two types of dc/dc faults generally do not bring great danger, and the fault diagnosis circuit can detect and alarm.
The third failure mode is more dangerous, it can burn the application circuit, generally through the overvoltage protection circuit to achieve overvoltage protection, but also can add a voltage regulator diode at the output end to achieve. In the design, the parameters of the diode should be reasonably selected to prevent the change of the voltage regulator point due to different temperatures. Some modules have their own overvoltage protection. Generally speaking, the module below 25w has no overvoltage protection function, and the module above 25w has an overvoltage protection circuit. The overvoltage protection point is generally designed for 135]- 145] rated voltage. In the detailed design, it is necessary to confirm whether the module has these functions to avoid repeated design.
The fourth will lead to input overcurrent, serious burning of the printed board, generally can be protected by selecting the appropriate safety tube at the input end. When wiring the fuse, it is generally arranged near the input end of the power module. The purpose of this design is to reduce the lead inductance of the input line and avoid the lead inductance causing overvoltage at the input end when the fuse is blown.
The fifth kind of dc/dc fault can be selected by the power module with overcurrent protection, the general power module has the overcurrent protection function, this module can be achieved by detecting the primary or secondary side current of the transformer in its interior, but to lose a certain efficiency. When making voltage module selection, it is not the larger the power rating, the better. If the derating is too large, the output current is insufficient to overcurrent the module due to the transmission voltage drop, which may cause overheating or even damage to the chip.