CN207946505U - The voltameter of electronic equipment and its battery capacity - Google Patents

Abstract

The utility model discloses a kind of electronic equipment and its voltameters of battery capacity.Wherein, the voltameter includes voltameter chip, first resistor, second resistance and the first capacitance, the ends CELL of the voltameter chip connect the anode of battery by first resistor, by second resistance connection+VCC3V3 feeder ears, also by the first capacity earth, the ends GND of voltameter chip are grounded the vdd terminal of voltameter chip；The ends SDA of the voltameter chip connect the main control chip of electronic equipment with the ends SCL；Cell voltage exports voltameter chip after first resistor samples, the main control chip of output electron equipment after analog-to-digital conversion is carried out by voltameter chip, by the main control chip real-time operation of electronic equipment, accurately measure the electricity of electronics, it realizes while accurately metering battery capacity, reduces product cost.

Description

The voltameter of electronic equipment and its battery capacity

Technical field

The utility model is related to electric power detection technical fields, the more particularly to voltameter of electronic equipment and its battery capacity.

Background technology

Currently, the electronic equipments such as smart mobile phone, notebook, tablet computer are required to use lithium battery, and these electronics Equipment all has the function of electric quantity metering, and the remaining capacity of battery is intuitively shown.But existing electronic equipment exists When realizing battery electric quantity metering, need to use dedicated gage probe resistance, by gage probe resistance by cell voltage The calculating that master control IC carries out electricity is conveyed to after being converted.But gage probe resistance is expensive, make electronic equipment at This height leads to do not have competitive advantage in electronic equipment cost.

Utility model content

Place in view of above-mentioned deficiencies of the prior art, the purpose of this utility model is to provide electronic equipment and its battery electricity The voltameter of amount, the electronic component used are few, at low cost.

In order to solve the above technical problems, the utility model takes following technical scheme：

A kind of voltameter for measuring the battery capacity of electronic equipment, including voltameter chip, first resistor, the second electricity Resistance and the first capacitance, the ends CELL of the voltameter chip connect the anode of battery, the VDD of voltameter chip by first resistor By second resistance connection+VCC3V3 feeder ears, also by the first capacity earth, the ends GND of voltameter chip are grounded at end；It is described The ends SDA of voltameter chip connect the main control chip of electronic equipment with the ends SCL；Cell voltage exports electricity after first resistor samples Gauge chip is carried out the main control chip of output electron equipment after analog-to-digital conversion by voltameter chip.

The voltameter of the battery capacity for measuring electronic equipment, further includes 3rd resistor, the voltameter core The ends CELL of piece are grounded also by 3rd resistor.

The voltameter of the battery capacity for measuring electronic equipment, further includes the second capacitance, the voltameter core The ends CELL of piece also pass through the second capacity earth.

Preferably, the voltameter chip uses the integrated chip of model CW2015.

A kind of electronic equipment, including pcb board and display screen are provided with main control chip, the main control chip on the pcb board It is electrically connected with display screen, voltameter as described above is additionally provided on the pcb board, led between the voltameter and main control chip Cross serial ports connection.

Further, the electronic equipment is tablet computer, laptop or smart mobile phone.

Compared to the prior art, the utility model provides the voltameter of electronic equipment and its battery capacity.Wherein, described Voltameter includes voltameter chip, first resistor, second resistance and the first capacitance, and the ends CELL of the voltameter chip pass through One resistance connects the anode of battery, and the vdd terminal of voltameter chip is by second resistance connection+VCC3V3 feeder ears, also by the One capacity earth, the ends the GND ground connection of voltameter chip；The ends SDA of the voltameter chip connect the master of electronic equipment with the ends SCL Control chip；Cell voltage exports voltameter chip after first resistor samples, and is exported after carrying out analog-to-digital conversion by voltameter chip The main control chip of electron equipment is accurately measured the electricity of electronics, is realized by the main control chip real-time operation of electronic equipment While accurately metering battery capacity, product cost is reduced.

Description of the drawings

Fig. 1 is the circuit diagram provided by the utility model for measuring the voltameter of the battery capacity of electronic equipment.

Specific implementation mode

In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and implementation Example, the present invention will be further described in detail.It should be appreciated that specific embodiment described herein is only used to explain The utility model is not used to limit the utility model.

Referring to Fig. 1, the voltameter of the battery capacity provided by the utility model for measuring electronic equipment includes electricity Count chip U1, first resistor R1, second resistance R2 and the first capacitance C1.The first resistor R1 and second resistance R2 is sampling Resistance, current voltages of the first resistor R1 for obtaining battery in real time, the second resistance R2 are pull-up resistor, give voltameter core Piece U1 power supplies.

The ends CELL of the voltameter chip U1 by the anodes of first resistor R1 connection batteries, voltameter chip U1's Vdd terminal passes through the first capacitance C1 by second resistance R2 connection+VCC3V3 feeder ears, also and is grounded, the ends GND of voltameter chip U1 Ground connection；The ends SDA of the voltameter chip U1 connect the main control chip of electronic equipment with the ends SCL；Cell voltage is through first resistor Voltameter chip U1 is exported after R1 samplings, the master control core of output electron equipment after analog-to-digital conversion is carried out by voltameter chip U1 Piece accurately measures the electricity of electronics by the main control chip real-time operation of electronic equipment, realizes in accurately metering battery capacity While, reduce product cost.

Please continue to refer to Fig. 1, the voltameter of the battery capacity provided by the utility model for measuring electronic equipment also wraps The ends CELL for including 3rd resistor R3, the voltameter chip U1 are grounded also by 3rd resistor R3.The 3rd resistor R3 is point Piezoresistance constitutes voltage sampling circuit together with first resistor R1, and voltameter chip U1 is by obtaining the both ends first resistor R1 Voltage to obtain the current voltage of battery, then carries out analog-to-digital conversion inside voltameter chip U1.

Further, the voltameter of the battery capacity provided by the utility model for measuring electronic equipment further includes second The ends CELL of capacitance C2, the voltameter chip U1 also pass through the second capacitance C2 ground connection.The second capacitance C2 is filter capacitor, Ensure that the voltage value that voltameter chip U1 is read is accurate.

Preferably, in the voltameter of the battery capacity provided by the utility model for measuring electronic equipment, the electricity Gauge chip U1 uses the integrated chip of model CW2015.

CW2015 chips possess small package, low cost, can apply simultaneously in system side and battery side without inspection leakage resistance Lithium battery gauge.The CW2015 moment tracks the working condition of lithium battery, calculates the residual capacity (SOC) of battery.CW2015 can The lithium battery, including lithium cobalt, lighium polymer and lithium manganese etc. of compatible different chemical systems.

The periphery circuit design that CW2015 is simplified, it is possible to reduce design time saves PCB surface product, and can be omitted costliness Inspection leakage resistance.There is CW2015 low SOC warning functions, the threshold value of alarm can be arranged by IIC simultaneously.CW2015 can be applied In system side or battery side, CW2015 uses general purpose I 2C buses, it is possible to provide the normal operating mode of (100Khz) and The rapid operation mode of (400kHz).

CW2015 can be applicable to system side and battery side, and maximum SOC estimation errors are 3%, it is possible to provide remaining capacity (SOC) It is estimated with remaining working time (RRT), low SOC alarms/interrupt function is provided.

Certainly, the utility model can also use other electric quantity metering chips, as long as can be real under the premise of low cost Existing electricity.

Based on the voltameter of the above-mentioned battery capacity for measuring electronic equipment, the utility model also provides a kind of electronics Equipment, including pcb board and display screen are provided with main control chip on the pcb board, and the main control chip is electrically connected with display screen, It is additionally provided with voltameter on the pcb board, is connected by serial ports between the voltameter and main control chip.By voltameter chip its The main control chip that the data of processing are sent to electronic equipment carries out final electricity calculating, and control display screen real-time display.

In the present embodiment, the electronic equipment is tablet computer, laptop or smart mobile phone, by for tablet Computer, laptop or smart mobile phone increase voltameter, eliminate expensive sensor, are realizing detection battery electricity in real time While amount, product cost is reduced.

The utility model can be by reality by battery by voltage sample by increasing external voltameter on PCB main board Voltage value samples and is connected to the read-only register inside CW2015 by CELL pins, and using GND pins as a ground Reference measure unit frame constantly updates battery terminal voltage value, then real-time Transmission enters analog-digital converter, converts data to Digital signal be sent to by SCL and SDA serial ports on electronic equipment pcb board EC (EMBEDDED CONTROLLER, it is embedded Controller).Real-time operation finally is carried out to real data and the internal cell basis information contained by EC internal codes, and is carried out After software compensation, accurately precisely voltameter scale concurrently send display for final acquisition one, realizes accurately electric quantity metering, and A few conventional electronic component is used, product cost is reduced.

It is understood that for those of ordinary skills, can with technical solution according to the present utility model and The design of its utility model is subject to equivalent substitution or change, and all these changes or replacement should all belong to appended by the utility model Scope of the claims.

Claims (6)

1. a kind of voltameter for measuring the battery capacity of electronic equipment, which is characterized in that including voltameter chip, the first electricity Resistance, second resistance and the first capacitance, the ends CELL of the voltameter chip connect the anode of battery, voltameter by first resistor The vdd terminal of chip by second resistance connection+VCC3V3 feeder ears, also pass through the first capacity earth, the ends GND of voltameter chip Ground connection；The ends SDA of the voltameter chip connect the main control chip of electronic equipment with the ends SCL；Cell voltage is adopted through first resistor Voltameter chip is exported after sample, and the main control chip of output electron equipment after analog-to-digital conversion is carried out by voltameter chip.

2. the voltameter according to claim 1 for measuring the battery capacity of electronic equipment, which is characterized in that further include The ends CELL of 3rd resistor, the voltameter chip are grounded also by 3rd resistor.

3. the voltameter according to claim 2 for measuring the battery capacity of electronic equipment, which is characterized in that further include The ends CELL of second capacitance, the voltameter chip also pass through the second capacity earth.

4. the voltameter according to claim 1 for measuring the battery capacity of electronic equipment, which is characterized in that the electricity Gauge chip uses the integrated chip of model CW2015.

5. a kind of electronic equipment, including pcb board and display screen, be provided with main control chip on the pcb board, the main control chip with Display screen is electrically connected, which is characterized in that the voltameter as described in claim 1-4 any one is additionally provided on the pcb board, It is connected by serial ports between the voltameter and main control chip.

6. electronic equipment according to claim 5, which is characterized in that the electronic equipment is tablet computer, notebook electricity Brain or smart mobile phone.