PM861AK01 3BSE018157R6 | ABB | Input terminal connected to mains power

Description

PM861AK01 3BSE018157R6 | FOXBORO | Input terminal connected to mains power

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As shown in Figure 3, the input terminal of the peripheral circuit is connected to mains power, and the output of PM861AK01 3BSE018157R6 can be equivalent to a DC power supply, connected to L and N of the ACDC switching power supply. C1 needs to be determined based on actual load, input voltage, and required holding time, and there is no clear recommended value. Due to the addition of C1, the startup surge current will increase. R1 can be used to reduce this surge current, and a 3W winding resistor can be selected, with a resistance value roughly between 2 and 7.5 ohms. For D1, a rectifier bridge with a voltage of 1000V and a current of 1.5A or higher can be selected. In addition, the impulse current that the rectifier bridge can withstand (as specified in the specifications) should be greater than the actual impulse current in the circuit.

To verify the correctness of theoretical analysis and calculations, PM861AK01 3BSE018157R6 selected LH25-10B05 from MORNSUN for testing. Under the condition of input voltage of 220Vac and load of 4A, the power-off holding time of LH25-10B05 is 76.8ms, and the waveform is shown in Figure 5; After connecting a 100uF/400V input filtering capacitor to the recommended circuit, the power outage holding time increased to 249ms, and the waveform is shown in Figure 6. The experimental results are consistent with the theoretical calculation results.

This article theoretically analyzes the power outage process of switching power supplies, and derives the calculation formula for the power outage holding time from PM861AK01 3BSE018157R6; According to the formula, a way to increase the power outage holding time through external circuits has been found. The correctness of theoretical calculations has been verified through practical testing. This method is simple to implement and has a significant effect on increasing power outage retention time, with strong engineering guidance significance.

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