WO2014205974A1 - Charging protection circuit for lithium battery - Google Patents

Charging protection circuit for lithium battery Download PDF

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Publication number
WO2014205974A1
WO2014205974A1 PCT/CN2013/086524 CN2013086524W WO2014205974A1 WO 2014205974 A1 WO2014205974 A1 WO 2014205974A1 CN 2013086524 W CN2013086524 W CN 2013086524W WO 2014205974 A1 WO2014205974 A1 WO 2014205974A1
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Prior art keywords
resistor
circuit
charger
diode
battery
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PCT/CN2013/086524
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French (fr)
Chinese (zh)
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杨宇帮
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惠州市蓝微电子有限公司
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Publication of WO2014205974A1 publication Critical patent/WO2014205974A1/en

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/18—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for batteries; for accumulators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H11/00—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result
    • H02H11/002—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result in case of inverted polarity or connection; with switching for obtaining correct connection
    • H02H11/003—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result in case of inverted polarity or connection; with switching for obtaining correct connection using a field effect transistor as protecting element in one of the supply lines
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/0034—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using reverse polarity correcting or protecting circuits

Definitions

  • the invention relates to the field of battery detection and protection, and in particular to a lithium battery charging protection circuit.
  • lithium-energy storage batteries are the new environmentally-friendly energy sources promoted worldwide, and are no longer limited to mobile phones, MP3, MP4.
  • the application of power sources for small and medium-sized mobile devices such as digital cameras and notebooks is gradually replacing lead-acid batteries and becoming a power source for power tools, electric motorcycles, and electric bicycles.
  • the country is also promoting lithium batteries to communication base stations, using high-power lithium batteries as energy storage power sources for communication base stations.
  • many households install rooftop photovoltaic systems or small wind turbine systems for homes, so home energy storage systems are one of the most indispensable devices.
  • Drawing 1 and Figure 2 are schematic diagrams of the correct installation and incorrect installation of the lithium battery.
  • the present invention provides a lithium battery charging protection circuit, which solves the problem of battery damage caused by a battery charging operation error, improves work efficiency, saves resources, and is beneficial to environmental protection.
  • a lithium battery charging protection circuit comprising a negative electrode connected to a rechargeable battery B- a switching circuit connected to the negative terminal P- of the charger and a charging signal detecting circuit connected to the switching circuit for controlling the switching circuit to be turned on and off, wherein the charging signal detecting circuit comprises a serial connection in the negative terminal of the charger P- Diode D1, Zener ZD1, Resistor R1, Resistor R2 between the negative B- of the rechargeable battery; the cathode D1 is connected to the negative terminal of the charger P- , diode D1 The negative pole is connected to the Zener diode ZD1 voltage regulator terminal, and the other end of the Zener diode ZD1 is connected with the resistor R1 and the resistor R2. The connection point of the resistor R1 and the resistor R2 is used as the output terminal of the signal detection circuit. Connect the switch circuit control terminal.
  • the switch circuit includes a MOS transistor Q1 and a MOS transistor Q2, and the MOS transistor Q1
  • the drain is connected to the negative terminal P- of the charger, the source thereof is connected to the negative terminal B- of the battery, the gate thereof is connected to the power input terminal IN, and a resistor R3 is arranged between the gate and the input terminal of the circuit;
  • the drain of the MOS transistor Q2 is connected to the gate of the MOS transistor Q1, the source thereof is connected to the negative terminal B- of the rechargeable battery, and the gate thereof is connected to the output terminal OUT of the signal detecting circuit.
  • the invention has the following beneficial effects: the invention provides an identification circuit for distinguishing whether the connection between the charger and the battery is correctly connected, and controls the normal charging of the battery, thereby avoiding battery quality damage caused by circuit connection error and prolonging the service life of the battery. Improve work efficiency, environmental protection and energy saving.
  • Figure 1 is a schematic diagram of the circuit for the correct connection of the lithium battery charging protection circuit.
  • FIG. 2 is a schematic diagram of the circuit in which the lithium battery charging protection circuit is incorrectly connected.
  • FIG. 3 is a circuit diagram showing a specific implementation of a lithium battery charging protection circuit according to an embodiment of the present invention.
  • FIG. 4 is a circuit diagram showing a specific implementation of a lithium battery charging protection circuit according to an embodiment of the present invention.
  • Embodiment 1 As shown in Figure 3.
  • the lithium battery charging protection circuit disclosed in this embodiment includes a negative electrode connected to the rechargeable battery B- and a negative terminal of the charger a switching circuit between P- and a charging signal detecting circuit connected to the switching circuit for controlling the switching circuit to be turned on and off, the charging signal detecting circuit comprising a series connection in the negative terminal of the charger P- and the negative electrode of the rechargeable battery B- Between the diode D1, the Zener ZD1, the resistor R1, the resistor R2; the diode D1 is connected to the negative terminal of the charger P-, the diode D1 is connected to the regulator ZD1 The voltage regulator terminal, the Zener diode ZD1 is connected to the resistor R1 and the resistor R2 in turn, and the connection point of the resistor R1 and the resistor R2 is used as the output terminal of the signal detection circuit. Connect the switch circuit control terminal.
  • the conduction voltage of the Zener diode ZD1 is greater than the voltage of the lithium battery, and when the charger is properly connected, the negative terminal of the charger P- The voltage is negative or less than the lithium battery voltage, diode D1 or Zener ZD1 cannot be turned on, and output OUT is low.
  • the charger negative terminal P- The voltage is greater than the voltage of the lithium battery, the diode D1 and the Zener diode ZD1 are turned on, and the output terminal OUT is high. Therefore, the output terminal OUT is detected by the switching circuit The high level and low level can determine whether the charger is connected incorrectly.
  • Embodiment 2 as shown in Figure 4 Shown.
  • the lithium battery charging protection circuit disclosed in this embodiment is an improvement on the basis of the first embodiment.
  • the embodiment includes including connecting to the negative pole of the rechargeable battery B- and the negative terminal of the charger P- a switching circuit and a charging signal detecting circuit connected to the switching circuit for controlling the switching circuit to be turned on and off, wherein the charging signal detecting circuit comprises a series connection in the charger negative terminal P- and the rechargeable battery negative B-
  • the diode D1 is connected to the negative terminal of the charger P-
  • the diode D1 is connected to the regulator ZD1
  • the voltage regulator terminal, the Zener diode ZD1 is connected to the resistor R1 and the resistor R2 in turn, and the connection point of the resistor R1 and the resistor R2 is used as the output terminal of the signal detection circuit.
  • the switch circuit includes a MOS transistor Q1 and a MOS transistor Q2, and a drain of the MOS transistor Q1 is connected to a charger negative terminal P-
  • the source is connected to the battery negative terminal B-, the gate is connected to the power input terminal IN, and the resistor R3 is arranged between the gate and the circuit input terminal IN; the drain of the MOS transistor Q2 and the MOS transistor
  • the gate of Q1 is connected, the source of which is connected to the negative terminal B- of the rechargeable battery, and the gate thereof is connected to the output terminal OUT of the signal detecting circuit.
  • the solution disclosed in this embodiment can be used when the charger is incorrectly connected, and the circuit of the lithium battery and the charger is in a closed state to prevent damage of the lithium battery or the charger.
  • the output end OUT is low
  • NMOS transistor Q2 is off
  • the gate voltage of NMOS transistor Q1 is pulled high by the IN terminal
  • NMOS transistor Q1 Open
  • the circuit between the charger and the battery is fully turned on; when the charger is connected incorrectly, the output OUT is high, the NMOS transistor Q2 is turned on, and the gate voltage of the NMOS transistor Q1 is Q2.
  • Pulled low NMOS transistor Q1 turns off, and the loop between the charger and the battery is disconnected.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Secondary Cells (AREA)

Abstract

A charging protection circuit for a lithium battery, comprising a switching circuit and a charging signal detection circuit, which is used for controlling the on and off of the switching circuit, wherein the switching circuit comprises a MOS tube Q1 and a MOS tube Q2; the charging signal detection circuit comprises a diode D1, a voltage regulator tube ZD1, a resistor R1 and a resistor R2 which are connected in series between a negative terminal (P-)of a charger and a negative electrode (B-) of a rechargeable battery successively; a positive electrode of the diode D1 is connected to the negative terminal (P-) of the charger; and a negative electrode of the diode D1 is connected to the voltage regulation end of the voltage regulator tube ZD1; the other end of the voltage regulator tube ZD1 is connected to the resistor R1 and the resistor R2 successively; and as an output end (OUT) of the charging signal detection circuit, a connection point of the resistor R1 and the resistor R2 is connected to a control end of the switching circuit. The protection circuit can distinguish whether the charger is correctly connected to a battery or not, thereby avoiding damage to battery quality caused by the incorrect connection of a circuit, prolonging the service life of the battery, improving the working efficiency, protecting the environment and saving energy.

Description

一种锂电池充电保护电路 Lithium battery charging protection circuit 技术领域  Technical field
本发明涉及电池检测保护领域，尤其涉及一种锂电池充电保护电路。  The invention relates to the field of battery detection and protection, and in particular to a lithium battery charging protection circuit.
背景技术  Background technique
随着环保概念的逐渐推广，锂储能电池做为全世界重点推广的新型环保能源，不再局限于手机、 MP3 、 MP4 、数码相机、笔记本等中小型移动设备动力电源的应用，正逐步取代铅酸电池，成为电动工具、电动摩托车、电动自行车等工具的电源。国家也正将锂电池推广至通信基站，采用大功率锂电池作为通信基站的储能电源。同时，伴随新能源走向民用市场，很多家庭安装屋顶光伏发电系统或家用小型风力发电机系统，因此家庭储能系统就成为其比不可少的设备之一。由于基站维护人员以及家庭用户大多对锂电池控制系统概念比较模糊，对本领域的技术不了解，因此在安装使用过程中会出现各种误操作。为了防止控制系统在安装时出现损坏，控制系统必须具备防止错误连接的措施。附图 1 以及附图 2 为锂电池正确安装以及错误安装电路示意图。  With the gradual promotion of the concept of environmental protection, lithium-energy storage batteries are the new environmentally-friendly energy sources promoted worldwide, and are no longer limited to mobile phones, MP3, MP4. The application of power sources for small and medium-sized mobile devices such as digital cameras and notebooks is gradually replacing lead-acid batteries and becoming a power source for power tools, electric motorcycles, and electric bicycles. The country is also promoting lithium batteries to communication base stations, using high-power lithium batteries as energy storage power sources for communication base stations. At the same time, with new energy going to the civilian market, many households install rooftop photovoltaic systems or small wind turbine systems for homes, so home energy storage systems are one of the most indispensable devices. Since the base station maintenance personnel and home users mostly have a vague concept of the lithium battery control system and do not understand the technology in the field, various misoperations may occur during installation and use. In order to prevent damage to the control system during installation, the control system must have measures to prevent incorrect connections. Drawing 1 and Figure 2 are schematic diagrams of the correct installation and incorrect installation of the lithium battery.
发明内容  Summary of the invention
本发明为了解决上述技术问题提供了一种锂电池充电保护电路，该锂电池充电保护电路解决了电池充电操作失误带来的电池损害问题，提高了工作效率，节约资源，有益于环保。 In order to solve the above technical problem, the present invention provides a lithium battery charging protection circuit, which solves the problem of battery damage caused by a battery charging operation error, improves work efficiency, saves resources, and is beneficial to environmental protection.
本发明所要解决的技术问题通过以下技术方案予以实现：一种锂电池充电保护电路，包括连接于充电电池负极 B- 与充电器负极端子 P- 之间的开关电路及与开关电路连接用于控制该开关电路通断的充电信号检测电路，所述充电信号检测电路包括依次串联在充电器负极端子 P- 与充电电池负极 B- 之间的二极管 D1 、稳压管 ZD1 、电阻 R1 、电阻 R2 ；所述二极管 D1 正极连接充电器负极端子 P- ，二极管 D1 负极连接稳压管 ZD1 稳压端，稳压管 ZD1 另一端依次连接电阻 R1 、电阻 R2 ，电阻 R1 、电阻 R2 的连接点作为信号检测电路的输出端 OUT 连接开关电路控制端。The technical problem to be solved by the present invention is achieved by the following technical solution: a lithium battery charging protection circuit, comprising a negative electrode connected to a rechargeable battery B- a switching circuit connected to the negative terminal P- of the charger and a charging signal detecting circuit connected to the switching circuit for controlling the switching circuit to be turned on and off, wherein the charging signal detecting circuit comprises a serial connection in the negative terminal of the charger P- Diode D1, Zener ZD1, Resistor R1, Resistor R2 between the negative B- of the rechargeable battery; the cathode D1 is connected to the negative terminal of the charger P- , diode D1 The negative pole is connected to the Zener diode ZD1 voltage regulator terminal, and the other end of the Zener diode ZD1 is connected with the resistor R1 and the resistor R2. The connection point of the resistor R1 and the resistor R2 is used as the output terminal of the signal detection circuit. Connect the switch circuit control terminal.
优选的，所述开关电路包括 MOS 管 Q1 、 MOS 管 Q2 ，所述 MOS 管 Q1 的漏极连接充电器负极端子 P- ，其源极连接于电池负极端子 B- ，其栅极连接电源输入端 IN ，在栅极与电路输入端 IN 之间设有电阻 R3 ； 所述 MOS 管 Q2 的漏极与 MOS 管 Q1 的栅极连接，其源极接于充电电池负极端子 B- ，其栅极连接于信号检测电路的输出端 OUT 。Preferably, the switch circuit includes a MOS transistor Q1 and a MOS transistor Q2, and the MOS transistor Q1 The drain is connected to the negative terminal P- of the charger, the source thereof is connected to the negative terminal B- of the battery, the gate thereof is connected to the power input terminal IN, and a resistor R3 is arranged between the gate and the input terminal of the circuit; The drain of the MOS transistor Q2 is connected to the gate of the MOS transistor Q1, the source thereof is connected to the negative terminal B- of the rechargeable battery, and the gate thereof is connected to the output terminal OUT of the signal detecting circuit.
本发明具有以下有益效果：本发明设置了一种辨别充电器与电池连接是否正确连接的识别电路，控制电池正常充电，这样避免了电路连接错误带来的电池质量损坏，延长了电池的使用寿命，提高了工作效率，环保节能。The invention has the following beneficial effects: the invention provides an identification circuit for distinguishing whether the connection between the charger and the battery is correctly connected, and controls the normal charging of the battery, thereby avoiding battery quality damage caused by circuit connection error and prolonging the service life of the battery. Improve work efficiency, environmental protection and energy saving.
附图说明 DRAWINGS
图 1 为锂电池充电保护电路正确连接的电路原理图。 Figure 1 is a schematic diagram of the circuit for the correct connection of the lithium battery charging protection circuit.
图 2 为锂电池充电保护电路错误连接的电路原理图。 Figure 2 is a schematic diagram of the circuit in which the lithium battery charging protection circuit is incorrectly connected.
图 3 为本发明实施例一锂电池充电保护电路具体实施电路图。FIG. 3 is a circuit diagram showing a specific implementation of a lithium battery charging protection circuit according to an embodiment of the present invention.
图 4 为本发明实施例二锂电池充电保护电路具体实施电路图。 4 is a circuit diagram showing a specific implementation of a lithium battery charging protection circuit according to an embodiment of the present invention.
具体实施方式 detailed description
为了让本领域的技术人员更好地理解本发明的技术方案，下面结合附图对本发明作进一步阐述。 In order to enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described below in conjunction with the accompanying drawings.
实施例一：如附图 3 所示。本实施例揭示的锂电池充电保护电路包括连接于充电电池负极 B- 与充电器负极端子 P- 之间的开关电路及与开关电路连接用于控制该开关电路通断的充电信号检测电路，所述充电信号检测电路包括依次串联在充电器负极端子 P- 与充电电池负极 B- 之间的二极管 D1 、稳压管 ZD1 、电阻 R1 、电阻 R2 ；所述二极管 D1 正极连接充电器负极端子 P- ，二极管 D1 负极连接稳压管 ZD1 稳压端，稳压管 ZD1 另一端依次连接电阻 R1 、电阻 R2 ，电阻 R1 、电阻 R2 的连接点作为信号检测电路的输出端 OUT 连接开关电路控制端。Embodiment 1: As shown in Figure 3. The lithium battery charging protection circuit disclosed in this embodiment includes a negative electrode connected to the rechargeable battery B- and a negative terminal of the charger a switching circuit between P- and a charging signal detecting circuit connected to the switching circuit for controlling the switching circuit to be turned on and off, the charging signal detecting circuit comprising a series connection in the negative terminal of the charger P- and the negative electrode of the rechargeable battery B- Between the diode D1, the Zener ZD1, the resistor R1, the resistor R2; the diode D1 is connected to the negative terminal of the charger P-, the diode D1 is connected to the regulator ZD1 The voltage regulator terminal, the Zener diode ZD1 is connected to the resistor R1 and the resistor R2 in turn, and the connection point of the resistor R1 and the resistor R2 is used as the output terminal of the signal detection circuit. Connect the switch circuit control terminal.
其中，稳压管 ZD1 的导通电压大于锂电池电压，当充电器正确连接时，充电器负极端子 P- 电压为负压或小于锂电池电压，二极管 D1 或稳压管 ZD1 不能导通，输出端 OUT 为低电平。当充电器错误连接时，充电器负极端子 P- 电压大于锂电池电压，二极管 D1 及稳压管 ZD1 导通，输出端 OUT 为高电平。因此，通过开关电路检测输出端 OUT 的高低电平可判断出充电器是否连接错误。Wherein, the conduction voltage of the Zener diode ZD1 is greater than the voltage of the lithium battery, and when the charger is properly connected, the negative terminal of the charger P- The voltage is negative or less than the lithium battery voltage, diode D1 or Zener ZD1 cannot be turned on, and output OUT is low. When the charger is incorrectly connected, the charger negative terminal P- The voltage is greater than the voltage of the lithium battery, the diode D1 and the Zener diode ZD1 are turned on, and the output terminal OUT is high. Therefore, the output terminal OUT is detected by the switching circuit The high level and low level can determine whether the charger is connected incorrectly.
实施例二：如附图 4 所示。本实施例揭示的锂电池充电保护电路是在实施例一基础上的改进。具体地说，本实施例包括包括连接于充电电池负极 B- 与充电器负极端子 P- 之间的开关电路及与开关电路连接用于控制该开关电路通断的充电信号检测电路，所述充电信号检测电路包括依次串联在充电器负极端子 P- 与充电电池负极 B- 之间的二极管 D1 、稳压管 ZD1 、电阻 R1 、电阻 R2 ；所述二极管 D1 正极连接充电器负极端子 P- ，二极管 D1 负极连接稳压管 ZD1 稳压端，稳压管 ZD1 另一端依次连接电阻 R1 、电阻 R2 ，电阻 R1 、电阻 R2 的连接点作为信号检测电路的输出端 OUT 连接开关电路控制端；所述开关电路包括 MOS 管 Q1 、 MOS 管 Q2 ，所述 MOS 管 Q1 的漏极连接充电器负极端子 P- ，其源极连接于电池负极端子 B- ，其栅极连接电源输入端 IN ，在栅极与电路输入端 IN 之间设有电阻 R3 ；所述 MOS 管 Q2 的漏极与 MOS 管 Q1 的栅极连接，其源极接于充电电池负极端子 B- ，其栅极连接于信号检测电路的输出端 OUT 。Embodiment 2: as shown in Figure 4 Shown. The lithium battery charging protection circuit disclosed in this embodiment is an improvement on the basis of the first embodiment. Specifically, the embodiment includes including connecting to the negative pole of the rechargeable battery B- and the negative terminal of the charger P- a switching circuit and a charging signal detecting circuit connected to the switching circuit for controlling the switching circuit to be turned on and off, wherein the charging signal detecting circuit comprises a series connection in the charger negative terminal P- and the rechargeable battery negative B- Between the diode D1, the Zener ZD1, the resistor R1, the resistor R2; the diode D1 is connected to the negative terminal of the charger P-, the diode D1 is connected to the regulator ZD1 The voltage regulator terminal, the Zener diode ZD1 is connected to the resistor R1 and the resistor R2 in turn, and the connection point of the resistor R1 and the resistor R2 is used as the output terminal of the signal detection circuit. Connecting the switch circuit control terminal; the switch circuit includes a MOS transistor Q1 and a MOS transistor Q2, and a drain of the MOS transistor Q1 is connected to a charger negative terminal P- The source is connected to the battery negative terminal B-, the gate is connected to the power input terminal IN, and the resistor R3 is arranged between the gate and the circuit input terminal IN; the drain of the MOS transistor Q2 and the MOS transistor The gate of Q1 is connected, the source of which is connected to the negative terminal B- of the rechargeable battery, and the gate thereof is connected to the output terminal OUT of the signal detecting circuit.
本实施例揭示的方案可当充电器错误连接时，锂电池与充电器的回路处于关闭状态，防止锂电池或充电器出现损坏。结合实施例一中锂电池充电保护电路工作原理，具体而言，当充电器正确连接时，输出端 OUT 为低电平， NMOS 管 Q2 关闭， NMOS 管 Q1 的控制极电压被 IN 端子拉高， NMOS 管 Q1 打开，充电器与电池之间的回路完全导通；当充电器错误连接时，输出端 OUT 为高电平， NMOS 管 Q2 导通， NMOS 管 Q1 的控制极电压被 Q2 拉低， NMOS 管 Q1 关闭，充电器与电池之间的回路断开。 The solution disclosed in this embodiment can be used when the charger is incorrectly connected, and the circuit of the lithium battery and the charger is in a closed state to prevent damage of the lithium battery or the charger. In combination with the working principle of the lithium battery charging protection circuit in the first embodiment, specifically, when the charger is properly connected, the output end OUT is low, NMOS transistor Q2 is off, and the gate voltage of NMOS transistor Q1 is pulled high by the IN terminal, NMOS transistor Q1 Open, the circuit between the charger and the battery is fully turned on; when the charger is connected incorrectly, the output OUT is high, the NMOS transistor Q2 is turned on, and the gate voltage of the NMOS transistor Q1 is Q2. Pulled low, NMOS transistor Q1 turns off, and the loop between the charger and the battery is disconnected.
从上述两实施例可看出，虽然具体电路较简洁，但是避免了电路连接错误带来的电池质量损坏，延长了电池的使用寿命，提高了工作效率，环保节能，实用性强，成本低，具有实质性特点和显著进步。 It can be seen from the above two embodiments that although the specific circuit is relatively simple, the battery quality damage caused by the circuit connection error is avoided, the service life of the battery is prolonged, the work efficiency is improved, the environment is energy-saving, the utility is strong, and the cost is low. Has substantial characteristics and significant progress.
以上为本发明较佳的实现方式，需要说明的是，在不背离本发明精神及其实质的情况下，如开关电路的其他具体形式等，熟悉本领域的技术人员当可根据本发明作出各种相应的改变和变形都应属于本发明所附的权利要求的保护范围。 The above is a preferred implementation of the present invention. It should be noted that those skilled in the art can make various according to the present invention without departing from the spirit and essence of the present invention, such as other specific forms of the switch circuit. Corresponding changes and modifications are intended to be included within the scope of the appended claims.

Claims (2)

  1. 一种锂电池充电保护电路，包括连接于充电电池负极B-与充电器负极端子P-之间的开关电路及与开关电路连接用于控制该开关电路通断的充电信号检测电路，其特征在于：所述充电信号检测电路包括依次串联在充电器负极端子P-与充电电池负极B-之间的二极管D1、稳压管ZD1、电阻R1、电阻R2；所述二极管D1正极连接充电器负极端子P-，二极管D1负极连接稳压管ZD1稳压端，稳压管ZD1另一端依次连接电阻R1、电阻R2，电阻R1、电阻R2的连接点作为信号检测电路的输出端OUT连接开关电路控制端。A lithium battery charging protection circuit includes a switching circuit connected between a negative electrode B- of a rechargeable battery and a negative terminal P- of the charger, and a charging signal detecting circuit connected to the switching circuit for controlling the switching circuit to be turned on and off, wherein the charging signal detecting circuit is characterized in that The charging signal detecting circuit includes a diode D1, a Zener diode ZD1, a resistor R1, and a resistor R2 connected in series between the charger negative terminal P- and the rechargeable battery negative terminal B-; the diode D1 positive electrode is connected to the charger negative terminal. P-, the negative pole of the diode D1 is connected to the voltage regulator ZD1 voltage regulator terminal, the other end of the Zener diode ZD1 is connected with the resistor R1 and the resistor R2 in turn, and the connection point of the resistor R1 and the resistor R2 is connected as the output terminal OUT of the signal detection circuit to the control terminal of the switch circuit. .
  2. 根据权利要求1所述的锂电池充电保护电路，其特征在于：所述开关电路包括MOS管Q1、MOS管Q2，所述MOS管Q1的漏极连接充电器负极端子P-，其源极连接于电池负极端子B-，其栅极连接电源输入端IN，在栅极与电路输入端IN之间设有电阻R3； 所述MOS管Q2的漏极与MOS管Q1的栅极连接，其源极接于充电电池负极端子B-，其栅极连接于信号检测电路的输出端OUT。The lithium battery charging protection circuit according to claim 1, wherein the switching circuit comprises a MOS transistor Q1 and a MOS transistor Q2, and a drain of the MOS transistor Q1 is connected to a charger negative terminal P-, and a source connection thereof The battery negative terminal B-, the gate is connected to the power input terminal IN, and a resistor R3 is arranged between the gate and the circuit input terminal IN; The drain of the MOS transistor Q2 is connected to the gate of the MOS transistor Q1, the source thereof is connected to the negative terminal B- of the rechargeable battery, and the gate thereof is connected to the output terminal OUT of the signal detecting circuit.
PCT/CN2013/086524 2013-06-28 2013-11-05 Charging protection circuit for lithium battery WO2014205974A1 (en)

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