The role of the gauge capacitor in the LED explosion-proof lamp and the basis for its parameter selection

The capacitance of LED explosion-proof lamps and the abbreviation of capacitors are one of the most widely used electronic components in electronic equipment. They are widely used in blocking, coupling, bypassing, filtering, tuning loops, energy conversion, control circuits and so on.

Safety capacitor is a kind of capacitor. It is applied in each switching power supply. Grounding plays a protective role. It is very important to ensure the safe use of the user. It has a very important role in the circuit. It is generally applied after the capacitor fails. The occasion of crisis personal safety. After the capacitor fails, it will not cause the motor, and it will not endanger the safety of the human body. Safety capacitors are usually only used for the overall filtering of the anti-jamming circuit. They are used in the power supply filter to filter the power supply and filter the common mode and differential mode interference respectively.

For safety reasons and EMC considerations, it is recommended to add a safety capacitor at the power inlet. At the input end of the AC power supply, it is generally necessary to add three safety capacitors to offset the EMI conduction interference. They are used in the power supply filter to filter the power supply and filter the common mode and differential mode interference respectively.

The safety parameters of the LED explosion-proof lamp are selected from the following points:

First, the quality of the safety parameters of the LED explosion-proof lamp is generally better. The cleavage removes the fixed frequency harmonics and can be calculated by f=L/2Ï€*C.

Second, draw on the LED explosion-proof lamp with CE certification (power is the same or close), after the disassembly, measure the parameters of the filter inductor and the safety capacitor parameters.

Third, if the LED explosion-proof lamp is required to require CE, you can choose the safety capacitor manufacturer with safety certification to provide parameters, according to the parameters they provide.

4. According to the working frequency of the LED explosion-proof lamp, the electromagnetic interference generated by the common mode and differential mode is suppressed, and the safety capacitance is calculated by the common mode and differential mode suppression inductance parameters.

5. As a safety capacitor in LED explosion-proof lamps, quality assurance is very important. When purchasing safety capacitors, you must have the certification of safety monitoring institutions and the safety certification of various industrial countries. The general products have certification marks.

Sixth, LED explosion-proof lamp in the safety parameters of the capacitor selection of the general capacity of the larger the better; learn from the CE certification of LED explosion-proof lamps (power is the same or close) after the measurement of the filter inductance parameters and safety capacitance parameters; choose to have safety certification The safety capacitor manufacturer provides parameters, and the safety capacitor is calculated according to the operating frequency difference mode of the LED explosion-proof lamp.