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Battery charging and discharging circuit

A charging and discharging circuit and battery technology, applied in battery circuit devices, circuit devices, battery load switching and other directions, can solve problems such as voltage changes and achieve the effect of maintaining voltage

Pending Publication Date: 2018-03-30
JOULWATT TECH INC LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of this, the present invention provides a battery charging and discharging circuit, which is used to solve the problem in the prior art that the voltage at both ends of the load changes continuously when the battery is being discharged.

Method used

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  • Battery charging and discharging circuit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The circuit of Embodiment 1 can complete two functions:

[0038] 1. Battery charging: switch tubes M2 and M3 work in high-frequency switching mode. When the load is disconnected, switches S1 and S3 are closed, and S2 is disconnected, the circuit is a boost circuit, the input is the input voltage, and the output is the battery V1 and V2 (battery pack), the input voltage charges the batteries V1 and V2.

[0039] 2. Battery discharge: the switch tubes M2 and M3 work in the high-frequency switching mode. When the switches S1 and S3 are disconnected and S2 is closed, the circuit is a boost circuit. The input is the voltage of the batteries V1 and V2 (battery pack), and the output is The voltage across the load.

[0040] Such as image 3As mentioned above, a partial structural schematic diagram of Embodiment 1 of the battery charging and discharging circuit of the present invention is shown. The battery charge and discharge circuit of the present invention includes a first...

Embodiment 2

[0044] Embodiment 2 can complete the charging and discharging process of the battery under two conditions of disconnecting the load and not disconnecting it, and can ensure the stability of the voltage at both ends of the load during the charging and discharging process of the battery under the above two conditions.

[0045] 1. The load is disconnected during charging

[0046] Battery charging: switch tubes M2 and M3 work in high-frequency switching mode, the first switch tube M1 is turned on, the third switch S3 is closed, and the second switch S2 is turned off, the input voltage passes through the power stage a circuit to charge the battery pack;

[0047] Battery discharge: the switching tubes M2 and M3 work in the high-frequency switching mode. When the first switching tube M1 and the third switch S3 are disconnected and the second switch S2 is closed, the battery pack passes the power stage circuit discharges the load.

[0048] 2. The load is not disconnected during char...

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PUM

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Abstract

The invention discloses a battery charging and discharging circuit which comprises a power level circuit, a first switch and a second switch. A first input end of the power level circuit is connectedwith a high potential end of input voltage, a second input end of the power level circuit is connected with a low potential end of the input voltage, a first output end of the power level circuit is connected with one end of the first switch, the other end of the first switch is connected with a positive electrode of a battery pack, a negative electrode of the battery pack is connected with a second output end of the power level circuit, a load is connected to an output end of the power level circuit, one end of the second switch is connected with the first switch and a common terminal of thebattery pack, and the other end of the second switch is connected with the first input end of the power level circuit. When a battery is charged and discharged, the voltage of two ends of the load iskept.

Description

technical field [0001] The invention relates to the technical field of power electronics, and more specifically, to a battery charging and discharging circuit. Background technique [0002] In practical applications, when a load such as a Bluetooth speaker is in use, it needs to charge the two internal lithium batteries first, and then use the discharge of the internal battery to supply power to the load. In the prior art, the 5V input voltage connected to the USB is generally used to directly charge two lithium batteries, and the lithium battery is directly used to supply power to the load. [0003] Such as figure 1 As shown, the load is a bluetooth speaker as an example, and the switching tubes M1 and M2 work in the high-frequency switching state. Use the USB to introduce an input voltage of 5V, charge the two lithium batteries V1 and V2 through the Boost circuit, and then use the battery pack composed of V1 and V2 to charge the Bluetooth speaker. [0004] However, when...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00
CPCH02J7/0013H02J7/0068H02J2207/20H02J7/00
Inventor 黄必亮周逊伟
Owner JOULWATT TECH INC LTD