CN203368109U - Detection circuit for lithium battery charger - Google Patents
Detection circuit for lithium battery charger Download PDFInfo
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- CN203368109U CN203368109U CN201320503365.7U CN201320503365U CN203368109U CN 203368109 U CN203368109 U CN 203368109U CN 201320503365 U CN201320503365 U CN 201320503365U CN 203368109 U CN203368109 U CN 203368109U
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 112
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 112
- 238000001514 detection method Methods 0.000 title claims abstract description 27
- 230000005669 field effect Effects 0.000 claims description 21
- 239000003990 capacitor Substances 0.000 claims description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
Description
技术领域 technical field
本实用新型涉及一种锂电池充电器检测电路。 The utility model relates to a lithium battery charger detection circuit.
背景技术 Background technique
现有的充电器给由多节锂电池构成的锂电池组进行充电时，其实时检测充电电压和充电电流，以防止过充而损坏锂电池。然而，其只能对锂电池组的总充电电压进行检测，不能采样单节锂电池的电压，锂电池组中的多节锂电池由于本身参数误差会导致多节锂电池的充电电压各不相同，那么，即使锂电池组的总充电电压不过充，但单节锂电池可能会出现过充的情况，而目前的充电器检测电路无法检测单节锂电池是否过充，显然埋下了安全隐患。 When an existing charger charges a lithium battery pack composed of multiple lithium batteries, it detects the charging voltage and charging current in real time to prevent damage to the lithium battery due to overcharging. However, it can only detect the total charging voltage of the lithium battery pack, and cannot sample the voltage of a single lithium battery. The charging voltage of the multi-cell lithium batteries in the lithium battery pack will be different due to their own parameter errors. , then, even if the total charging voltage of the lithium battery pack is not fully charged, a single lithium battery may be overcharged, and the current charger detection circuit cannot detect whether a single lithium battery is overcharged, which obviously buryes a potential safety hazard .
实用新型内容 Utility model content
针对现有技术的不足，本实用新型的目的旨在于提供一种可检测单节锂电池的充电电压的锂电池充电器检测电路。 Aiming at the deficiencies of the prior art, the purpose of this utility model is to provide a lithium battery charger detection circuit capable of detecting the charging voltage of a single lithium battery.
为实现上述目的，本实用新型采用如下技术方案： In order to achieve the above object, the utility model adopts the following technical solutions:
一种锂电池充电器检测电路，其包括锂电池保护芯片、MCU、用于产生充电电压的直流充电电压产生模块； A lithium battery charger detection circuit, which includes a lithium battery protection chip, an MCU, and a DC charging voltage generating module for generating charging voltage;
该直流充电电压产生模块的正充电端和负充电端分别用于连接锂电池组的正极和负极； The positive charging terminal and the negative charging terminal of the DC charging voltage generating module are respectively used to connect the positive pole and the negative pole of the lithium battery pack;
锂电池保护芯片包括与锂电池组中的锂电池数量相同的电压检测端，每一电压检测端用于连接锂电池组中对应的一锂电池的正极，以检测每一锂电池的单节锂电池充电电压，锂电池保护芯片用于将单节锂电池充电电压与预设的单节锂电池过充电压进行比对，在单节锂电池充电电压超过单节锂电池过充电压时，该锂电池保护芯片输出一单节锂电池过充信号至该MCU，该MCU控制该直流充电电压产生模块停止输出充电电压。 The lithium battery protection chip includes the same number of voltage detection terminals as the number of lithium batteries in the lithium battery pack, and each voltage detection terminal is used to connect the positive pole of a corresponding lithium battery in the lithium battery pack to detect the lithium battery of each lithium battery. Battery charging voltage, the lithium battery protection chip is used to compare the charging voltage of a single-cell lithium battery with the preset overcharge voltage of a single-cell lithium battery. When the charging voltage of a single-cell lithium battery exceeds the overcharge voltage of a single-cell lithium battery, the The lithium battery protection chip outputs a single-cell lithium battery overcharge signal to the MCU, and the MCU controls the DC charging voltage generating module to stop outputting the charging voltage.
进一步的，该锂电池保护芯片的每一电压检测端与对应的一锂电池的正极之间连接一电阻。 Further, a resistor is connected between each voltage detection terminal of the lithium battery protection chip and a corresponding positive electrode of a lithium battery.
进一步的，每一锂电池的正极和负极之间连接一电容。 Further, a capacitor is connected between the positive pole and the negative pole of each lithium battery.
进一步的，直流充电电压产生模块包括整流器、变压器、二极管、第一电阻和第一场效应；交流电源依次通过整流器和变压器连接二极管的阳极，二极管的阴极连接第一场效应管的源极，第一场效应管的漏极连接正充电端，第一场效应管的栅极连接MCU的控制端，第一电阻的一端连接负充电端，第一电阻的另一端接地。 Further, the DC charging voltage generating module includes a rectifier, a transformer, a diode, a first resistor, and a first field effect; the AC power supply is connected to the anode of the diode through the rectifier and the transformer in sequence, and the cathode of the diode is connected to the source of the first field effect transistor. The drain of the FET is connected to the positive charging terminal, the gate of the first FET is connected to the control terminal of the MCU, one end of the first resistor is connected to the negative charging terminal, and the other end of the first resistor is grounded.
进一步的，锂电池充电器检测电路还包括电源IC、场效应管、第二电阻至第五电阻；直流充电电压产生模块的正充电端通过第二电阻和第三电阻接地，MCU的电压反馈端通过第五电阻连接于第二电阻和第三电阻之间的节点，MCU的电流反馈端通过第四电阻连接负充电端，MCU的反馈信号输出端连接电源IC 的反馈信号输入端，电源IC 的控制端连接第二场效应管的栅极，第二场效应管的源极通过第五电阻接地，第二场效应管的漏极连接变压器的一次侧。 Further, the lithium battery charger detection circuit also includes a power supply IC, a field effect transistor, and a second resistor to a fifth resistor; the positive charging terminal of the DC charging voltage generation module is grounded through the second resistor and the third resistor, and the voltage feedback terminal of the MCU The fifth resistor is connected to the node between the second resistor and the third resistor, the current feedback terminal of the MCU is connected to the negative charging terminal through the fourth resistor, the feedback signal output terminal of the MCU is connected to the feedback signal input terminal of the power supply IC, and the power supply IC’s The control end is connected to the gate of the second field effect transistor, the source of the second field effect transistor is grounded through the fifth resistor, and the drain of the second field effect transistor is connected to the primary side of the transformer.
本实用新型的有益效果如下： The beneficial effects of the utility model are as follows:
上述实用新型可避免任一节锂电池过充，从而使得锂电池组的使用寿命更长，充电更安全。 The above-mentioned utility model can prevent any lithium battery from being overcharged, so that the service life of the lithium battery pack is longer and the charging is safer.
附图说明 Description of drawings
图1为本实用新型锂电池充电器检测电路的较佳实施方式的电路图。 Fig. 1 is a circuit diagram of a preferred embodiment of the utility model lithium battery charger detection circuit.
具体实施方式 Detailed ways
下面将结合附图以及具体实施方式，对本实用新型做进一步描述： Below in conjunction with accompanying drawing and specific embodiment, the utility model is further described:
请参见图1，本实用新型涉及一种锂电池充电器检测电路，其较佳实施方式包括锂电池保护芯片U1、电阻R1至电阻R12、场效应管Q1、场效应管Q2、整流器Z、变压器T、二极管D1、电源IC10和MCU 20。
Please refer to Fig. 1, the utility model relates to a detection circuit of a lithium battery charger, and its preferred embodiment includes a lithium battery protection chip U1, resistors R1 to R12, field effect transistor Q1, field effect transistor Q2, rectifier Z, transformer T, diode D1, power supply IC10 and
交流电源AC依次通过整流器Z和变压器T连接二极管D1的阳极，二极管D1的阴极连接场效应管Q1的源极，场效应管Q1的漏极连接正充电端，场效应管Q1的栅极连接MCU 20的控制端，电阻R11的一端连接负充电端，电阻R11的另一端接地，正充电端还通过电阻R7和电阻R8接地，MCU 20的电压反馈端通过电阻R10连接于电阻R7和电阻R8之间的节点，MCU 20的电流反馈端通过电阻R9连接负充电端，MCU 20的反馈信号输出端连接电源IC 10的反馈信号输入端，电源IC 10的控制端连接场效应管Q2的栅极，场效应管Q2 的源极通过电阻12接地，场效应管Q2的漏极连接变压器T的一次侧。
The AC power supply connects the anode of the diode D1 through the rectifier Z and the transformer T in turn, the cathode of the diode D1 connects to the source of the field effect transistor Q1, the drain of the field effect transistor Q1 connects to the positive charging terminal, and the gate of the field effect transistor Q1 connects to the
锂电池B1至锂电池B5串联组成一锂电池组，该锂电池组连接于正充电端和负充电端之间，以进行充电。锂电池保护芯片U1的正电源端VDD通过电阻R1连接正供电端，锂电池保护芯片U1的第一电压检测端VC1至第五电压检测端VC5分别通过电阻R2至电阻R6分别连接锂电池B1至锂电池B5的正极，电容C1至电容C5分别连接于锂电池B1至锂电池B5的正极和负极之间，该锂电池保护芯片U1的负电源端VSS连接负供电端，该锂电池保护芯片U1的信号输出端连接MCU 20的反馈输入端。
The lithium battery B1 to the lithium battery B5 are connected in series to form a lithium battery pack, and the lithium battery pack is connected between the positive charging terminal and the negative charging terminal for charging. The positive power supply terminal VDD of the lithium battery protection chip U1 is connected to the positive power supply terminal through the resistor R1, and the first voltage detection terminal VC1 to the fifth voltage detection terminal VC5 of the lithium battery protection chip U1 are connected to the lithium battery B1 to the lithium battery through the resistors R2 to R6 respectively. The positive pole of the lithium battery B5, the capacitors C1 to C5 are respectively connected between the positive poles and the negative poles of the lithium battery B1 to the lithium battery B5, the negative power supply terminal VSS of the lithium battery protection chip U1 is connected to the negative power supply terminal, and the lithium battery protection chip U1 The signal output end of the signal is connected to the feedback input end of
充电器对锂电池组进行充电时，该MCU 20实时检测锂电池组的充电电压和充电电流，以判断锂电池组是否过充。同时，该锂电池保护芯片U1实时检测锂电池B1至锂电池B5的单节锂电池充电电压，并将单节锂电池充电电压与预设的单节锂电池过充电压进行比对，在单节锂电池充电电压超过单节锂电池过充电压时，该锂电池保护芯片U1即输出一单节锂电池过充信号如高电平信号至该MCU 20，该MCU 20根据该单节锂电池过充信号控制场效应管Q1截止，从而停止给锂电池组充电。如此，即可避免任一节锂电池过充，从而使得锂电池组的使用寿命更长，充电更安全。
When the charger is charging the lithium battery pack, the
本实施例中，该整流器Z、变压器T、二极管D1、电阻R11和场效应Q1构成一直流充电电压产生模块，用于产生充电电压。 In this embodiment, the rectifier Z, the transformer T, the diode D1, the resistor R11 and the field effect Q1 form a DC charging voltage generation module for generating a charging voltage.
对于本领域的技术人员来说，可根据以上描述的技术方案以及构思，做出其它各种相应的改变以及变形，而所有的这些改变以及变形都应该属于本实用新型权利要求的保护范围之内。 For those skilled in the art, various other corresponding changes and modifications can be made according to the technical solutions and ideas described above, and all these changes and modifications should fall within the protection scope of the claims of the present invention .
Claims (5)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201320503365.7U CN203368109U (en) | 2013-08-16 | 2013-08-16 | Detection circuit for lithium battery charger |
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| CN201320503365.7U CN203368109U (en) | 2013-08-16 | 2013-08-16 | Detection circuit for lithium battery charger |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106208221A (en) * | 2016-08-10 | 2016-12-07 | 合肥国盛电池科技有限公司 | Lithium battery group protection mechanism |
| CN115733223A (en) * | 2022-11-28 | 2023-03-03 | 东莞华贝电子科技有限公司 | Battery module, mobile terminal and charging method |
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2013
- 2013-08-16 CN CN201320503365.7U patent/CN203368109U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106208221A (en) * | 2016-08-10 | 2016-12-07 | 合肥国盛电池科技有限公司 | Lithium battery group protection mechanism |
| CN115733223A (en) * | 2022-11-28 | 2023-03-03 | 东莞华贝电子科技有限公司 | Battery module, mobile terminal and charging method |
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Effective date of registration: 20160826 Address after: 425000 Industrial Road, Hexi Industrial Zone, Lingling Industrial Zone, Lingling District, Yongzhou, Hunan Patentee after: Hunan tech-power Technology Co., Ltd. Address before: 518100 Guangdong city of Shenzhen province Baoan District Fuyong street community baishixia Longwangmiao Industrial Zone sixteenth, nineteenth Patentee before: Songshun Electronic (Shenzhen) Co., Ltd. |
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Granted publication date: 20131225 Termination date: 20180816 |