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Active battery equalization circuit utilizing relevance of flyback transformer clamped by battery and control method thereof

A flyback transformer and battery equalization technology, which is applied in charge equalization circuits, battery circuit devices, circuit devices, etc., can solve problems such as battery power imbalance, reduce sampling points, increase capacity and utilization, and simplify system power Effect

Pending Publication Date: 2020-01-31
上海多木实业有限公司
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide an active battery equalization circuit and its control method that utilizes the correlation of each winding of the flyback transformer being clamped by the battery voltage, and solves the problem of battery pack charging and discharging in the prior art. The problem of power imbalance

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  • Active battery equalization circuit utilizing relevance of flyback transformer clamped by battery and control method thereof

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specific Embodiment

[0032] Specific examples, such as figure 1 Shown:

[0033] An active battery balancing circuit utilizing the correlation of flyback transformers, including a control unit, a drive unit, and a rechargeable battery pack; the specific circuit configuration is: the control unit includes a control single-chip microcomputer and a drive circuit connected to it, a voltage sampling circuit, and a current sampling circuit 1. Power supply circuit; the drive unit includes four sets of flyback circuit branches composed of drive MOS tubes MA, MB, MC, MD and flyback transformers TA, TB, TC, TD. A, B, C, D charging, battery pack A is composed of batteries A1 and A2 in series, similarly battery packs B, C, and D are composed of B1, B2, C1, C2, D1, D2 respectively; the current sampling circuit includes sampling resistors RA, RB, RC, RD. The following takes the flyback circuit branch corresponding to the battery pack A as an example to introduce the topology of the circuit in detail. The outpu...

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Abstract

The invention discloses an active battery equalization circuit utilizing relevance of a flyback transformer clamped by a battery. The circuit comprises a control unit, a driving unit and a rechargeable battery pack. The method comprises steps of testing a total voltage before equalizing charging of the battery, and calculating an average voltage of all battery packs; testing a voltage of each battery pack in the circuit, calculating voltage difference between the voltage of all the battery packs and the average voltage, and selecting the battery to charge according to the relationship betweenthe voltage difference and a preset threshold. The circuit and the method are advantaged in that large-current equalization can be carried out on the batteries at any time, so all single batteries inthe battery pack both can be charged to the highest voltage and discharged to the lowest voltage, the capacity and the utilization rate of the battery pack are fully improved, and simplicity and highefficiency of the system are kept. By utilizing conciseness of the single-ended flyback transformer and relevance of the winding voltage of the same transformer, the number of transformers is reduced,sampling points are reduced, and equalization and speediness are achieved.

Description

technical field [0001] The invention belongs to the field of battery charging circuits, and in particular relates to an active battery balancing circuit and a control method thereof utilizing the correlation of a flyback transformer. Background technique [0002] At present, in the application of battery-powered equipment, the actual work requires the series connection of multiple batteries, and the capacity of these batteries will always vary. If the single-cell protection is not performed during charging or use, the battery will be overcharged or over-discharged. , which will affect the battery life, and the protection will make the battery pack capacity not fully utilized. [0003] The current battery equalization technology is divided into two types: active and passive. Generally, passive energy equalization is used to discharge the energy consumption of the overcharged battery after the battery is fully charged. The system is complex, and it is rare to perform equaliza...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00
CPCH02J7/0014H02J7/0019
Inventor 张建民赵克勇
Owner 上海多木实业有限公司
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