The purchase of DC conversion power supply should be cautious(2)

1. Flame retardant properties can not be ignored

input protection circuit
General module power products have built-in filters, which can meet the requirements of general power supply applications. If a more demanding power system is required, an input filter network should be added. An LC or π-type network can be used, but care should be taken to choose a smaller inductance and larger capacitance as much as possible.
In order to prevent the transient high voltage of the input power supply from damaging the power supply of the module, it is recommended that the user connect a transient absorption diode at the input end and use it with a fuse to ensure that the module is within a safe input voltage range. In order to reduce common-mode noise, Y (Cy) capacitors can be added, and a few nf high-frequency capacitors are generally selected. R is a fuse, D1 is a protection diode, and D2 is a transient absorption diode (P6KE series).

Mechanical equipment will generate a lot of heat energy during use, especially in the current market competition is intensifying, in order to improve their market competitiveness, many companies continue to strengthen production, 24-hour production has become the norm, if the flame retardant power module Insufficient performance, long-term work may cause the spontaneous combustion of the power module, which may bring huge losses to the enterprise. Therefore, the flame retardant performance must not be ignored when purchasing a DC conversion power supply otherwise it is very likely that the gain will outweigh the gain.

2. Insulation needs to be considered

The advent of the era of intelligence has led to more and more electrical equipment. In order to protect the reputation of the company and ensure the safety of consumers, the insulation problem must be considered when purchasing power modules. If the insulation of the power module is insufficient, it will be used for a long time. There may be leakage of electricity. Once a consumer is injured, it will have a serious impact on the brand image of the company, and it may even make a company slump and disappear from the market completely.