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How to repair Switching power supply 24V product broken


At present, the types of switching power supplies are widely used in various electronic devices due to their small size, light weight and high efficiency. They are indispensable power supplies in current life.

At present, the types of switching power supplies are widely used in various electronic devices due to their small size, light weight and high efficiency. They are indispensable power supplies in current life. Today we are talking about the Switching power supply 24V product. What does the Switching power supply 24V product do? Is it the same as an ordinary switching power supply? How to repair Switching power supply 24V equipment broken?

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Switching power supply 24V product maintenance:
1. When repairing Switching power supply 24V products, 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;
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 products do not start to vibrate, 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 If it is found that there are scorched parts or broken components on the PCB of the power supply, the components and related circuit components should be checked. 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 it is the failure of the Switching power supply 24V product that 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 resistance to ground of each group of output terminals. When it is normal, there should be a capacitor charging and discharging swing on the needle, and the last indication should be the resistance value of the bleeder resistance of the circuit.
2. The transformer generates heat or emits a "buzz buzz" sound, usually because the switching frequency is wrong;
3. If the output voltage power indicator flashes once and again, it is usually a short circuit on the secondary side.
Generally, switch 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, the power is detected. If you can see that there is a burnout on the surface, it is better to check. The above is the maintenance method of the Switching power supply 24V product.

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