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How to solve some problems encountered in the use of Switching power supply 24V


When repairing the Switching power supply 24V, first use a multimeter to detect whether each power component has a breakdown or short circuit, such as power rectifier bridge stack, switch tube, high-frequency high-power rectifier tube.

When repairing the Switching power supply 24V, first use a multimeter to detect whether each power component has a breakdown or short circuit, such as power rectifier bridge stack, switch tube, high-frequency high-power rectifier tube;

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Whether the high-power resistor that suppresses the surge current is blown out. Then check whether the resistance of each output voltage port is abnormal. If the above components are damaged, they need to be replaced. , Switching power supply 24V does not start vibration, generally check whether the switching frequency is correct, whether the protection circuit is blocked, the voltage feedback circuit, the current feedback circuit are okay, whether the switching tube is broken, etc.; first check whether the fuse is blown, and then observe the inside of the power supply In case, if you find that there are scorched parts or broken components on the PCB of the power supply, you should focus on the components and related circuit components here. Smell whether there is a scent inside the power supply, and check whether there are burnt components. Use a multimeter to measure the voltage across the high-voltage capacitor. If the 24V switching power supply does not vibrate or the switch tube is open, in most cases, the voltage at both ends of the high-voltage filter capacitor is not discharged. This voltage is more than 300 volts, so be careful. Use a multimeter to measure the forward and reverse resistance at both ends of the AC power cord and the charging of the capacitor. The resistance value should not be too low, otherwise there may be a short circuit inside the power supply. The capacitor should be able to charge and discharge. Disconnect the load and measure the ground resistance of each group of output terminals. When it is normal, the meter needle should have capacitor charging and discharging swings, and the last indication should be the resistance of the bleeder resistance of the circuit.
If the transformer generates heat or makes a "buzz buzz" sound, it is usually because the switching frequency is wrong.
The Switching power supply 24V manufacturer tells you that the output voltage power indicator flashes once and again, usually because there is a short circuit on the secondary side.
Switching power supply 24V manufacturers tell you that general switching tubes, charging resistors, and rectifier diodes are more prone to damage, so generally use a digital multimeter to measure first, and if there is no damage, it is tested when the power is on. If you can see that there is a burn out on the surface, it is better to check. The above are some problems of 24V Switching power supply 24V maintenance. I hope to help you.

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