CN102879742A - Battery electric quantity detection circuit - Google Patents

Battery electric quantity detection circuit Download PDF

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Publication number
CN102879742A
CN102879742A CN2012103352821A CN201210335282A CN102879742A CN 102879742 A CN102879742 A CN 102879742A CN 2012103352821 A CN2012103352821 A CN 2012103352821A CN 201210335282 A CN201210335282 A CN 201210335282A CN 102879742 A CN102879742 A CN 102879742A
Authority
CN
China
Prior art keywords
diode
microcontroller
battery
detection circuit
resistance
Prior art date
Application number
CN2012103352821A
Other languages
Chinese (zh)
Inventor
卢运娇
祝春来
Original Assignee
卢运娇
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 卢运娇 filed Critical 卢运娇
Priority to CN2012103352821A priority Critical patent/CN102879742A/en
Publication of CN102879742A publication Critical patent/CN102879742A/en

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Abstract

The invention provides a battery electric quantity detection circuit. The battery electric quantity detection circuit comprises a resistor, a diode and a microcontroller. A voltage drop on the diode is converted into a digital signal for operation processing through the microcontroller, so as to obtain a battery voltage, as a result, the battery electric quantity is obtained through a corresponding voltage-electric quantity relation. The battery electric quantity detection circuit has the advantages of simple structure, easiness for manufacture, low cost and low power consumption and the like, and can be connected with circuits of various electronic products required to be powered by batteries by slightly adjusting device types only.

Description

A kind of battery power detection circuit
Technical field
The invention belongs to electronics and power technique fields, relate to a kind of battery power detection circuit.
Background technology
Large-scale electronic device or communication apparatus have very advanced battery electric quantity detection system, but rely in the battery operated portable or hand-held electronic product a lot, and the battery electric quantity measurement function also relatively is short of.In the electronic product course of work, battery electric quantity can reduce gradually along with the working time, there is not the product of battery electric quantity measuring ability can cause the battery over-discharge can, the over-discharge can of battery can cause the inside battery electrochemical structure to change, make battery undermined, even the major accident such as set off an explosion, and battery electric quantity is crossed the low circuit normal operation that also can affect.For fear of the overdischarge phenomenon occurs, a battery power detection circuit can be set in electronic product, the Continuous Tracking battery dump energy, simultaneously dump energy information is shown to the user, reminding user in time charges to battery or changes battery, perhaps automatically cut off the powered battery loop, avoid causing heavy losses.
Summary of the invention
Goal of the invention and beneficial effect: this goal of the invention is given exactly and is made battery-powered portable or hand-held electronic product that a kind of battery power detection circuit is provided.
Evidence: the circuit of this invention only uses several common electronic devices and components just to realize the measurement of battery electric quantity.The advantages such as that this circuit has is simple in structure, be easy to make, with low cost and power consumption is few only just need slightly adjust and can be connected with the circuit of the battery powered electronic product of various needs.
Battery power detection circuit of the present invention by: a resistance R 1, a diode D4 and a microcontroller IC1 form, and its feature comprises:
Resistance R 1: an end of resistance R 1 is connected to supply voltage VCC, and the other end is connected with the positive pole of diode D4, and resistance R 1 provides bias current for diode D4;
Diode D4: the positive pole of diode D4 is connected with resistance R 1, and the negative pole of diode D4 is connected to the IO mouth of microcontroller IC1, and diode D4 provides reference voltage for voltage detecting;
Microcontroller IC1: the power supply lower margin connecting circuit ground GND of microcontroller IC1, the supply pin of microcontroller IC1 is connected to supply voltage VCC, and the analog to digital conversion input pin of microcontroller IC1 (being again the A/D input pin) connects the positive pole of diode D4.Microcontroller IC1 is the voltage drop VD4 on the diode D4, converts the digital signal row operation of going forward side by side to and processes, and draws the supply voltage VCC of battery, thereby judges whether battery is under-voltage.Suppose that the conversion accuracy of A/D is the n position, the pressure drop of diode is VD4, and the result of A/D sampling is x, and then the relation between they and the cell voltage VCC is as follows:
VCC = VD 4 X × 2 n
Calculate powered battery voltage by following formula, the relation according to cell voltage and electric weight draws battery electric quantity again.
Description of drawings
Accompanying drawing 1 is battery power detection circuit schematic diagram provided by the invention;
Accompanying drawing 2 provides an infrared remote controller embodiment schematic diagram that has utilized battery power detection circuit of the present invention to realize the battery undervoltage warning function;
1-1 is the circuit that the reference voltage part is provided to IC1 in the battery power detection circuit;
1-2 is the circuit of microcontroller part in the battery power detection circuit.
Embodiment
According to battery power detection circuit schematic diagram and description of drawings shown in the accompanying drawing 1, and take an infrared remote controller schematic diagram providing shown in the accompanying drawing 2 as embodiment, and implement to realize the present invention by the components and parts technical requirement of described embodiment.
The technical parameter of electronic devices and components
The voltage of electric battery BT1 is 3V;
Capacitor C 1 is selected 100uF/6.3V, and the C2 capacitance size is 0.1uF;
LED1 is infrared transmitting tube, and model is IR204-A, and LED2 selects Φ 3mm red light emitting diodes, and D4 is general-purpose diode, and selecting model is IN4148;
The resistance of resistance R 6 is 10 Ω, and the resistance of R1 is 1K Ω, and the resistance of R7 is 270 Ω, and the resistance of resistance R 11 is 1K Ω;
Q1 is triode, and model is S8050;
IC1 is microcontroller, the SN8F27E62 single-chip microcomputer that this example selects the Taiwan S0NIX to produce, and this model single-chip microcomputer can be worked under 2.0V-5.0V voltage, built-in PWM, the A/D module, and have online programming function (lSP).
K1-K5 is the shift knob of Infrared remote controller, selects common touch-switch.
If the circuit of electronic product itself just is designed with the microcontroller with A/D, so only need in this product circuit, implant the 1-1 part of Fig. 1, just can carry out battery electric quantity measures, if do not use the electronic product with the microcontroller of A/D, need to utilize the present invention to realize the battery electric quantity measurement, so must be in product circuit 1-1,1-2 two parts circuit of connection layout 1, could realize the battery electric quantity measuring ability.Present embodiment is a Infrared remote controller, itself has just used microcontroller, this part circuit of 1-1 that so only need to connect into Fig. 1 can be realized, thus, for different electronic products, only need circuit component model of the present invention is just slightly adjusted and can be connected with the various circuit that need to measure battery electric quantity.
Present embodiment be take by the battery powered infrared remote controller of 3V as example, the model of used electronic devices and components is to select according to the actual conditions of present embodiment, it does not affect applicability of the present invention and ubiquity.If be used in other electronic products, then need the resistance according to actual conditions adjusting resistance R1, suitably select the model of microcontroller IC1 to get final product.

Claims (2)

1. a battery power detection circuit is comprised of a resistance R 1, a diode D4 and a microcontroller IC1, and its feature comprises: an end of resistance R 1 is connected to supply voltage VCC, and the other end is connected with the positive pole of diode D4; The positive pole of diode D4 is connected with resistance R 1, and the negative pole of diode D4 is connected to the IO mouth of microcontroller IC1; The power supply lower margin connecting circuit ground GND of microcontroller IC1, the supply pin of microcontroller IC1 connects supply voltage VCC, and the analog to digital conversion input pin of microcontroller IC1 (being again the A/D input pin) connects the positive pole of diode D4.
2. battery power detection circuit according to claim 1, it is characterized in that: microcontroller IC1 reads the voltage drop VD4 on the diode D4, and converts digital signal to; Suppose that the conversion accuracy of A/D is the n position, the pressure drop of diode is VD4, and the result of A/D sampling is x, and then the relation between they and the cell voltage VCC is as follows:
VCC = VD 4 X × 2 n
CN2012103352821A 2012-09-12 2012-09-12 Battery electric quantity detection circuit CN102879742A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2012103352821A CN102879742A (en) 2012-09-12 2012-09-12 Battery electric quantity detection circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2012103352821A CN102879742A (en) 2012-09-12 2012-09-12 Battery electric quantity detection circuit

Publications (1)

Publication Number Publication Date
CN102879742A true CN102879742A (en) 2013-01-16

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN2012103352821A CN102879742A (en) 2012-09-12 2012-09-12 Battery electric quantity detection circuit

Country Status (1)

Country Link
CN (1) CN102879742A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104111426A (en) * 2013-07-05 2014-10-22 广东美的制冷设备有限公司 Remote controller electric quantity detection method and device
WO2015085469A1 (en) * 2013-12-09 2015-06-18 吉瑞高新科技股份有限公司 System and method for detecting power supply voltage and power supply system
CN108957324A (en) * 2017-05-18 2018-12-07 佛山市顺德区美的电热电器制造有限公司 The detection device and method of electric cooking pot and wherein battery capacity

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2427815Y (en) * 2000-03-17 2001-04-25 哈尔滨工业大学 Apparatus for testing electric capacit in batter
JP2001186688A (en) * 1999-12-22 2001-07-06 Matsushita Electric Works Ltd Connection detection circuit of backup current, and backup power supply device therewith
CN2662518Y (en) * 2003-11-13 2004-12-08 福州高奇晶圆电子科技有限公司 Fast charger for nickel-hydrogen cell
CN1882843A (en) * 2003-12-04 2006-12-20 保诚电子工程有限公司 Battery cell voltage and impedance measuring circuit
CN101345425A (en) * 2007-07-11 2009-01-14 天津市中天峰电器有限公司 Intelligentized battery charge control circuit
WO2012050100A1 (en) * 2010-10-14 2012-04-19 矢崎総業株式会社 Voltage measurement device for plurality of assembled batteries
CN202393821U (en) * 2012-01-03 2012-08-22 丁希庆 Low voltage alarm device for battery pack
CN202994997U (en) * 2012-09-12 2013-06-12 卢运娇 Battery electric quantity detection circuit

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001186688A (en) * 1999-12-22 2001-07-06 Matsushita Electric Works Ltd Connection detection circuit of backup current, and backup power supply device therewith
CN2427815Y (en) * 2000-03-17 2001-04-25 哈尔滨工业大学 Apparatus for testing electric capacit in batter
CN2662518Y (en) * 2003-11-13 2004-12-08 福州高奇晶圆电子科技有限公司 Fast charger for nickel-hydrogen cell
CN1882843A (en) * 2003-12-04 2006-12-20 保诚电子工程有限公司 Battery cell voltage and impedance measuring circuit
CN101345425A (en) * 2007-07-11 2009-01-14 天津市中天峰电器有限公司 Intelligentized battery charge control circuit
WO2012050100A1 (en) * 2010-10-14 2012-04-19 矢崎総業株式会社 Voltage measurement device for plurality of assembled batteries
CN202393821U (en) * 2012-01-03 2012-08-22 丁希庆 Low voltage alarm device for battery pack
CN202994997U (en) * 2012-09-12 2013-06-12 卢运娇 Battery electric quantity detection circuit

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104111426A (en) * 2013-07-05 2014-10-22 广东美的制冷设备有限公司 Remote controller electric quantity detection method and device
CN104111426B (en) * 2013-07-05 2017-10-27 广东美的制冷设备有限公司 A kind of remote control detection method of quantity of electricity and device
WO2015085469A1 (en) * 2013-12-09 2015-06-18 吉瑞高新科技股份有限公司 System and method for detecting power supply voltage and power supply system
CN108957324A (en) * 2017-05-18 2018-12-07 佛山市顺德区美的电热电器制造有限公司 The detection device and method of electric cooking pot and wherein battery capacity

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Application publication date: 20130116

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