Power source output current direction control and protection device

Abstract

The invention relates to a power source output current direction control and protection device. The output end of a rectification unit is connected with a filtering unit, the output positive end of the filtering unit is connected with a backward flowing prevention diode and an output control switch, the output control switch is connected with a voltage reduction circuit, the cathode of the backward flowing prevention diode is connected with a voltage detection branch, a switch and an inductive load, one end of the voltage detection branch is located at the front end of the inductive load, one end of a sampling branch connected with the rear end of the inductive load, the other end of the voltage detection branch and the other end of the sampling branch are connected to a control circuit unit, the control circuit unit and the switch are connected with the output control switch in a control mode, the other end of the switch is connected with an energy storage capacitor through a current limiting resistor, the output end of the current limiting resistor is connected with a boosting circuit, the boosting circuit and the voltage reduction circuit are both connected with a high-voltage energy storage capacitor, and the control circuit unit, the filtering unit, the boosting circuit, the voltage reduction circuit, the energy storage capacitor and the high-voltage energy capacitor are grounded. The power source output current direction control and protection device absorbs and utilizes the energy flowing backwards from the load, limits the highest voltage of the load, and protects the load.

Description

technical field [0001] The invention relates to a power supply output current direction control and protection device under the condition of inductive load. Background technique [0002] At present, the DC power supply can convert the mains power into a constant or variable DC voltage, and can adjust the output voltage and current values ​​to supply power to the load. In order to maintain the stability of the output voltage, many large-capacity electrolytic capacitors are generally connected in parallel at the output end, and sometimes a long cable or filter inductor is connected to the output end for remote power supply. [0003] In order to prevent the internal output capacitor of the charger from charging the internal output capacitor of the charger to cause excessive voltage and burn out the circuit under the condition of inductive load, the traditional power supply generally adds an output diode or a relay to the output to prevent the current from flowing back. This me...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art, and provide a power supply output current direction control and protection device under the condition of inductive load, which can ensure the safety of the load system when the output current cannot be reversed into the power supply, and at the same time the energy Recyclable without generating excess heat

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