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Lithium battery quick charging circuit and application thereof

A technology of lithium batteries and battery packs, applied in battery circuit devices, different battery charging, circuit devices, etc., can solve the problems of high cost, cumbersome design of constant voltage and constant current chargers, etc., and achieve the effect of improving cost performance

Pending Publication Date: 2020-06-12
厦门兴卓科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of this, the technical problem to be solved by the present invention is to provide a lithium battery fast charging circuit and its application, which overcomes the technical problems of cumbersome design and high cost of the current secondary-side controlled constant voltage and constant-current charger, and can greatly improve the secondary side. Cost-effectiveness of controlled constant voltage and constant current chargers

Method used

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  • Lithium battery quick charging circuit and application thereof
  • Lithium battery quick charging circuit and application thereof
  • Lithium battery quick charging circuit and application thereof

Examples

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Embodiment 1

[0030] see Figure 2 to Figure 6 As shown, this embodiment provides a lithium battery fast charging circuit, including a C-DC switching power supply module, an indicator light indicating control module, and a constant voltage and constant current feedback control loop.

[0031] like figure 2 and image 3 As shown, the AC-DC switching power supply module has two mains input terminals L, N, and is connected to two battery pack connection terminals V+ and V-; further includes: fuse F1, rectifier bridge BD1, and EC1, EC2, The filtering and EMC circuit composed of L1; BD1 is a fast recovery rectifier bridge, which refers to a rectifier bridge with a reverse recovery time ≤ 50nS. BD1 is a combination of 4 diodes (such as FR, HER series), with Four pins A1, A3, B3 and C4, among them, the A1 pin of BD1 is connected to the mains input terminal L through the fuse F1, the A3 pin is connected to the mains input terminal N, the B3 pin is connected to the primary coil of T1 through L1, a...

Embodiment 2

[0045] This embodiment is an application of the lithium battery fast charging circuit in the first embodiment to an electric tool, which can be used for fast charging of the electric tool. Its typical parameters are 12V2.4A for three strings of 18650 power batteries with a capacity of 2000mA, which can be charged within one hour.

[0046] The advantage of the present invention is that: the lithium battery fast charging circuit of the present invention adopts a chip (such as a KP201 chip or a DP2291 chip) that requires secondary side control and can realize constant voltage and constant current functions to perform secondary side control constant voltage and constant current output, and adopts The chip that can detect the voltage of the secondary rectifier diode (such as the UP7358 chip) realizes the charging indication circuit, so as to form a constant voltage constant current charger with an indicator light. This solution saves the cumbersome design of LM358 and high-power sam...

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Abstract

The invention provides a lithium battery quick charging circuit and an application thereof, and the circuit comprises an AC-DC switching power supply module which is connected with the connection endsV + and V-of a battery pack; a constant-voltage constant-current feedback control loop which comprises a control chip IC1, a photoelectric coupler PH1, a transformer T1 and a three-terminal regulatorU1, wherein T1 is connected between the AC-DC switching power supply module and V + and V-, a Pin3 pin of the IC1 is connected to a primary coil of the T1 through a capacitor C4 to form a constant-current loop, a Pin2 is connected with a primary coil of T1 through a photoelectric triode of PH1, U1 is connected between a secondary coil of T1 and V + through a light emitting diode of PH1, and a constant-voltage loop is formed; and an indicating lamp indication control module which achieves an indication control function through a control chip U2, a current-limiting resistor R21, a detection diode D6, a detection diode D7 and two indicating lamps. According to the invention, the design difficulty is greatly simplified, the cost is reduced, and the cost performance is greatly improved.

Description

【Technical field】 [0001] The invention relates to a lithium battery fast charging circuit. 【Background technique】 [0002] Lithium battery chargers are currently divided into fast charging and slow charging. Whether it is the communication industry such as mobile phones or hand-held electric tools, the demand for fast charging is becoming stronger and stronger. Although the communication industry has international standards such as QC3.0, QC4.0, etc., there is currently no unified protocol standard applied to the fast charging circuit of electric tools, only the corresponding safety standard. So how to make a universal and cost-effective power tool charger is a boon for consumers. [0003] At present, switching power supply chargers in the power tool industry are roughly divided into two types: [0004] The first is a PSR (primary side control) switching power supply charger, which omits the optocoupler and the three-terminal voltage regulator 431, and can achieve constant...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00H02M3/335H02J7/04H02J7/10
CPCH02J7/007H02J7/0047H02M3/33523H02J7/04H02J7/06
Inventor 林建琰林二勇
Owner 厦门兴卓科技有限公司
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