High-power battery charging device capable of preventing reverse current charging and battery reversal

Abstract

The invention relates to a high-power battery charging device capable of preventing reverse current charging and battery reversal. The output end of a rectifying unit is connected with a filter unit; the output positive end of the filter unit is connected with a reverse charging preventing diode; the output negative end of the filter unit is connected with a reverse connection preventing switch and a detection circuit diode; a control circuit unit is connected with the reverse connection preventing switch to control turn-on and turn-off of the reverse connection preventing switch; the negative electrode of the reverse charging preventing diode is connected with a first sampling circuit; the negative electrode of the detection circuit diode and one end of the reverse connection preventing switch are connected with a second sampling circuit; the first sampling circuit and the second sampling circuit are connected with the control circuit unit; and the control circuit unit and the filter unit are grounded. Voltages of positive connection and reverse incorrect connection of a battery are detected by two paths of voltage detection respectively, then three conditions that the battery is not connected, accurately connected and inaccurately connected are identified, and the control circuit unit carries out three operations according to the three conditions, so that various accidents of electric shock of workers, short circuit of the battery and the like are avoided.

Description

technical field [0001] The invention relates to a high-power battery charging device for preventing current reverse feeding and battery reverse connection. Background technique [0002] The high-power charging power supply converts the mains power into a constant or variable DC voltage, and adjusts the output voltage limit and current limit according to the artificial setting or the communication content of the battery management system to charge the battery. [0003] In order to prevent the battery from suddenly charging the internal output capacitor of the charger at the moment when the battery is suddenly connected, the traditional charger usually adds an output diode or a similar device to prevent current backflow. This measure can effectively prevent the problem that the battery is suddenly connected in the forward direction, but because the charger cannot detect the polarity voltage value of the battery, the following problems cannot be avoided: 1) The battery is not c...

AI Technical Summary

Problems solved by technology

This measure can effectively prevent the problem that the battery is suddenly connected in the forward direction, but because the charger cannot detect the polarity voltage value of the battery, the following problems cannot be avoided: 1) The battery is not connected to the charging power source, and the output of the charging power source may be exposed to the outside. Turning on the machine may cause accidents such as electric shock; 2) The charging power supply and the battery have been connected, but the polarity is reversed: the positive pole of the battery is connected to the negative pole of the charger output, and the negative pole of the battery is connected to the positive pole of the charger. It will be short-circuited by the rectifier diode output by the charger, causing an accident

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