Circuit and method for voltage equalization in large batteries

摘要

A battery equalization circuit is provided, comprising: a positive battery node connected to a positive terminal of a monitored battery cell contained in a battery circuit that includes a plurality of other battery cells connected in series with the monitored battery cell; a negative battery node connected to a negative terminal of the monitored battery cell; a secondary transformer coil configured to receive a square wave, the secondary transformer coil having an upper transformer node and a lower transformer node; an upper switch connected between the positive battery node and the upper transformer node; a lower switch connected between the negative battery node and the lower transformer control node; and a control circuit configured to control operation of the upper and lower switches based on a measured cell voltage between the positive battery node and the negative battery node, and a total battery voltage of the battery circuit.

主权项

1. A battery equalization circuit, comprising:
a first positive battery node configured to connect to a positive terminal of a first battery cell contained in a battery circuit that includes a plurality of other battery cells connected in series with the first monitored battery cell; a first negative battery node configured to connect to a negative terminal of the first battery cell; a first transformer coil configured to receive an output voltage of an AC generator, the first transformer coil having a first upper transformer node and a first lower transformer node; a first upper switch connected between the first positive battery node and the first upper transformer node; a first lower switch connected between the first negative battery node and the first lower transformer control node; a control circuit configured to control the operation of the first upper switch and the first lower switch based on a first measured cell voltage between the first positive battery node and the first negative battery node, and a total battery voltage of the battery circuit; a second positive battery node configured to connect to a positive node of a second battery cell selected from the plurality of other battery cells connected in series with the first battery cell; a second negative battery node configured to connect to a negative node of the second battery cell; a second transformer coil configured to receive the output voltage of the AC generator, the second transformer coil having a second upper transformer node and a second lower transformer node; a second upper switch connected between the second negative battery node and the second upper transformer node; and a second lower switch connected between the second positive battery node and the second lower transformer node, wherein the control circuit is further configured to control the operation of the second upper switch and the second lower switch based on a second measured cell voltage between the second positive battery node and the second negative battery node, and the total battery voltage of the battery circuit.