Why switching power supply with two series capacitor filter, with a can you
Series capacitor has two purposes, one is to increase the capacitance of the voltage, a capacitor may be pressure is not enough. Another one is to short-circuit test, when a capacitor short circuit, the entire circuit will not be short-circuit, will not damage the circuit and power.
If your product does not have this test requirement, and your capacitor's voltage is greater than the maximum input voltage, then you can only use one.
Two series to increase the pressure, improve the reliability of the power supply.
The two capacitors are used in series because the circuit uses a symmetrical dual power supply, and the capacitive + - connecting pin is the common ground of the circuit.
Computer power is such a circuit, you can see there are two 220v470u electrolytic capacitors.
The use of symmetrical power supply is to reduce the use of the circuit voltage, improve circuit safety.
