Multi-level drive circuit for battery pack equalization circuit

Abstract

The multi-level drive circuit of the battery pack equalization circuit, two or more Zener diodes are connected in series between the collectors of a PNP transistor and an NPN transistor to form a voltage divider circuit, and the corresponding PNP and The emitters of the NPN transistors are connected separately; the emitters of the PNP transistors are connected to the power supply terminal, and the emitters of the NPN transistors are grounded; the bases of the transistors in the voltage divider circuit are used as the start signal input terminals, and the electrode terminals of each Zener diode are used as energy storage switches Each MOS tube gate signal control terminal in the circuit. The triode is connected in series with the voltage regulator tube to form a voltage divider circuit. Using the reverse breakdown working characteristics of the voltage regulator tube, the voltage regulator tube can generate a large current to synchronously drive and control the gate of the MOS tube and meet the working performance indicators of the MOS tube, so that the storage The switch circuit can balance the battery when the battery power is unbalanced. The invention has simple and practical structure, low energy consumption, small volume, light weight and low cost, which is beneficial to the miniaturization and integrated design of the battery pack balance control circuit.

Description

technical field [0001] The invention relates to a driving circuit of an automatic equalizing circuit of a series accumulator, in particular to a multi-level driving circuit of an equalizing circuit of a battery group. Background technique [0002] Series battery packs have been widely used as a power source for energy storage in electric vehicles. In battery packs, due to objective factors such as performance differences between individual batteries and their service life cycles, in order to avoid premature overcharging and over-discharging of a single battery Failure to make the function and performance index of the battery pack reach or approach the level of the single battery, it is necessary to implement balanced control between the single cells in the battery pack. [0003] The battery balancing circuit disclosed in US Patent No. 5479083 ( figure 1 shown), in this circuit, the battery pack in series is composed of B1 and B2, which are charged by the charging circuit 12...

AI Technical Summary

Problems solved by technology

[0005] The automatic battery equalization circuit ( image 3 As shown), although it does not need to be synchronized with other equalizers serving batteries in series, nor does it need a closed-loop compensation circuit to obtain a satisfactory equalization effect, but the control signal transmission it uses is also a transformer, which is relatively difficult for the circuit design. High-power transmission transformers are not only large in size and high in cost, but also not conducive to the stability of line work.

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