Programmable DC power supplies are generally equipped with OVP overvoltage protection, OCP overcurrent protection, OTP overtemperature protection for AC-DC power supplies, and OPP overpower protection for programmable DC power supplies. In this article, we will describe these AC and DC power protection features in detail.

 

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Overvoltage protection function, OVP for short: When the voltage of the protected line exceeds the preset maximum value, it is a protection method to disconnect the power supply or reduce the voltage of the controlled device.

When the output voltage exceeds the OVP set value, the output will be blocked. Such control circuits are designed to prevent the load from burning out and breaking when the voltage rises. The working mode will be divided into input switch trip type and terminal output type according to the model and model. OVP works, in addition to power failure, external voltage or external control when the overvoltage input, etc.

Overcurrent protection function, OCP for short: Overcurrent protection is a protection mode that makes the protection device operate when the current exceeds the predetermined maximum value. When the current flowing through the protected element exceeds a preset value, the protection device is activated, and the time limit is used to ensure the selectivity of the action, so that the circuit breaker trips or gives an alarm signal.

For OCP-equipped devices, the output current is limited when the current reaches the OCP setting value. (Depending on the model, it is divided into input switch trip types and terminal output types like OVPs.) OCPs operate due to failures of the power supply itself and the overcurrent input during external control.

Overtemperature protection, or OTP, is similar to OHP (overheat protection). This function sets the upper limit in the temperature output. When the internal temperature of the power supply rises abnormally, the power supply will automatically generate protection. If the power supply fails, the operation will stop, so as to protect the machine from overheating and burning the machine components.

Overpower protection function, OPP for short, when the load in the power supply overvoltage, or after the load occurs a short circuit overcurrent and other over-power fault, the overload protection circuit in the circuit through the feedback circuit to cut off the main power supply, protect the circuit and load. The fault does not extend.