A power supply is a device used to convert electrical energy into the voltage, current and power required by a circuit, which is usually described by the output voltage and output current of the power supply. A power supply has the ability to act as a load, it can provide the required current and voltage to external circuits. However, in some cases, a power supply may fail to carry a load. In this article, we'll look at the reasons why a power supply can't carry a load and how to fix the problem.

Load capacity of a power supply

In an electrical circuit, a power supply provides electrical energy through wires. External circuits are connected to ports on the output of the power supply; these are often called output ports. Between the power supply and the external circuit, there is a certain amount of resistance that can be thought of as a limiter of the current supplied by the power supply to the external circuit. When a higher voltage is applied to the external circuit, the power supply will not be able to supply the required power unless the output current of the power supply is able to meet the demand of the external circuit.

The load capacity of a power supply is usually measured by its output power. The higher the output power, the more power the power supply will be able to provide to the external circuits. When selecting a power supply, we need to determine the required output power based on the current and voltage required by the external circuit. If the output power of the power supply is not high enough, it will not be able to provide the required power to the external circuits, which may lead to circuit failure or damage.

Reasons why a power supply cannot carry a load

A power supply that cannot bring up a load may be due to the following reasons:

1. Insufficient output power: If the output power of the power supply is not large enough, it will not be able to provide the required power for external circuits. In this case, the power supply may be overloaded or unable to make the circuit work.

2. Power protection: Modern power supplies usually have built-in protection circuits to protect the power supply from failure or damage. If the load on external circuits exceeds the power supply's load capacity, the power supply's protection circuitry may automatically shut down the power supply's output. This is to prevent the power supply from being overloaded or damaged.

3. Incorrect power supply settings: If the power supply is not set up correctly, it may not be able to provide the required power to the load. For example, if the output voltage of the power supply is set too low, it will not be able to meet the demands of external circuits.

4. Poor power supply wiring: Poor connections in the power supply wiring, or damaged or failed filters in the power supply wiring, may cause the power supply to fail to provide the required power to the load.

5. Failure of external circuits: Sometimes the inability of a power supply to provide the required power may be due to the failure or damage of external circuits. For example, a short circuit in an external circuit can overload the power supply and prevent the power supply from providing the required power to the circuit.

Solutions for power supplies that can't carry loads

Here are some ways to solve the problem of a power supply not being able to carry a load:

1. Increase the output power: If the output power of the power supply is not high enough, consider replacing the power supply with a higher power supply or adding parallel power to the output port of the power supply.

2. Check the power protection: If the protection circuit of the power supply is triggered, we need to check whether the power supply is overloaded or the power supply is faulty. We need to make sure that the fault has been recovered, and then restart the power supply.

3. Set the power supply according to the load demand: Set the output voltage and current of the power supply according to the load demand to ensure that the power supply provides the required power for the load.

4. Check the power supply wiring: Check whether the power supply wiring connection is good, whether the filter is damaged or failed, and make sure there is a good circuit connection between the power supply and the load.

5. Troubleshooting external circuitry: It is necessary to check the external circuitry for short circuits, broken circuits, and other faults. After solving the circuit failure, reconnect the power supply so that the power supply provides the required power for the load.