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Foldback protection in High Power DC power supply

2020-08-13

For any automatic test system, DC Power Supply is one of the important equipment. In this kind of application, the Power Supply is required to have the characteristics of high stability, high efficiency, high precision and easy to program control.


Generally speaking, the Programmable DC Power Supply in the automatic test system has two output modes: CV and CC. Under certain voltage and current parameters, the power supply will work in CV or CC mode according to the electronic load. When the load changes, the power supply can automatically switch between the two output modes. For example, when the voltage and current set by the power supply are 10V and 10A, and the load is more than 1 Ω, the power supply will maintain the CV output mode of 10V, and the current value is the ratio of voltage and load;when the load is less than 1 Ω, the power supply will maintain the CC output mode of 10A, and the voltage value is the product of current and load; if the load fluctuates around 1 Ω, the power supply will automatically maintain the CV and CC mode Switch.


This automatic switching function of DC power supply has certain flexibility, and can maintain the Power Supply in the same output mode within a certain range of load change; and can still maintain the work within the range of power supply capacity when the load change is beyond the expected range.However, if the load has very high voltage or current sensitive characteristics, or need to ensure that the power supply works in a certain mode, this automatic switching function has limitations. For example, when testing the laser diode, it is necessary to ensure that the power supply works in CC mode, otherwise the tested part will be damaged.


APM technologies High Power DC Power Supply provides a special function foldback protection function. That is, when the power output mode is converted,the power output can be turned off immediately or after a certain delay according to the parameters set by the foldback function. The type of triggering protection can be selected from constant voltage to constant current mode or from CC to CV mode. Foldback function can be set through touch screen of DC power supply, enter foldback function setting interface by clicking protection function menu, select to enable this function, select CC or CV as trigger protection type, and delay time range is 0.001 to 10 seconds.

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APM technologies high power DC power supply can provide ultra-high density programmable power output in unit volume. At the same time, the product adopts high-frequency isolation scheme and PFC active power factor correction technology, which can make this model have extremely high efficiency and power factor performance no matter where it works, so as to reduce energy consumption, reduce interference, purify the environment, and meet the requirements of green energy saving.

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