CN209570677U - A kind of electric quantity detecting circuit - Google Patents
A kind of electric quantity detecting circuit Download PDFInfo
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- CN209570677U CN209570677U CN201821846810.9U CN201821846810U CN209570677U CN 209570677 U CN209570677 U CN 209570677U CN 201821846810 U CN201821846810 U CN 201821846810U CN 209570677 U CN209570677 U CN 209570677U
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Abstract
The utility model provides a kind of electric quantity detecting circuit, including buck converter and voltage detector, the voltage input end of buck converter connects battery, one end of enable end connection first resistor and second resistance, the other end of first resistor connects voltage input end, is grounded after voltage input end connection first capacitor；The end of convert of buck converter connects the first inductance and is followed by voltage output end, voltage output end is grounded after connecting the second capacitor, one end of feedback end connection 3rd resistor and the 4th resistance, the other end of 3rd resistor connects voltage output end, the feedback end of buck converter is also connected with the drain electrode that the 5th resistance is followed by metal-oxide-semiconductor, the source electrode of metal-oxide-semiconductor is grounded, the detection input of the grid connection voltage detector of metal-oxide-semiconductor, the ground terminal of voltage detector is grounded, the voltage input end of the detection output connection buck converter of voltage detector.The utility model realizes the technical effect for detecting high and low two grades of electricity, simplifies electric power detection process, improves electric power detection accuracy.
Description
Technical field
The utility model relates to battery capacity detection technique field more particularly to a kind of electric quantity detecting circuits.
Background technique
Electricity display screen is typically provided on microphone, for showing the electricity height of battery in microphone.Electricity display screen
It is connect with electric quantity detecting circuit, existing electric quantity detecting circuit is set as detecting high, medium and low three gear electricity and show on a display screen
Show, usually battery power voltage be 2.5V~4.2V in the case where, electric quantity detecting circuit output detection voltage be 1.5V,
1.3V, 1.1V, since the display of middle gear 1.3V is usually inaccurate, it may appear that practical although display screen shows 1.3V electricity
Electricity has been lowered to relatively low value, therefore, there are detection process cumbersome, the testing result accuracy of existing electric quantity detecting circuit
Not high deficiency.
Utility model content
The utility model provides a kind of electric quantity detecting circuit in view of the above shortcomings of the prior art, solves optimization electricity
Detection circuit improves the technical issues of electric power detection accuracy.
The utility model in order to solve the above problem used by technical solution are as follows:
The utility model provides a kind of electric quantity detecting circuit, connect with battery, including buck converter and voltage detector,
The voltage input end of buck converter connects the battery, the enable end connection first resistor of buck converter and second resistance
One end, the other end of first resistor connect the voltage input end, and the other end ground connection of second resistance, the voltage input end is also
It is grounded after connection first capacitor；The end of convert of buck converter connects the first inductance and is followed by voltage output end, and voltage output end connects
Be grounded after connecing the second capacitor, one end of the feedback end of buck converter connection 3rd resistor and the 4th resistance, 3rd resistor it is another
One end connects the voltage output end, the other end ground connection of the 4th resistance, and the feedback end of buck converter is also connected with the 5th
Resistance is followed by the drain electrode of metal-oxide-semiconductor, the source electrode ground connection of metal-oxide-semiconductor, the detection input of the grid connection voltage detector of metal-oxide-semiconductor, electricity
The ground terminal ground connection of detector is pressed, the detection output of voltage detector connects the voltage input end of the buck converter.
Further, the metal-oxide-semiconductor is N-MOS pipe.
Further, the battery exports 2.5~4.2V voltage.
Further, the buck converter is depressured conversion chip using the DC/DC of ME3104 model.
Further, the voltage detector uses the voltage checking chip of ME2803 model.
The utility model has the beneficial effects that:
Electric quantity detecting circuit provided by the utility model is by setting buck converter and voltage detector and is connected
It connects in foregoing circuit structure, realizes the technical effect for only detecting high and low two grades of electricity, be greater than 3.3V in battery power voltage
When, the high electric power detection voltage of 1.5V is exported, when battery power voltage is less than or equal to 3.3V, exports the low battery inspection of 1.1V
It surveys voltage and improves electric power detection accuracy to simplify electric power detection process.
Detailed description of the invention
Fig. 1 is the electrical block diagram of the utility model electric quantity detecting circuit.
Specific embodiment
The embodiments of the present invention is specifically illustrated with reference to the accompanying drawing, and attached drawing is only for reference and illustrates use, not structure
The limitation of pairs of the utility model patent protection scope.
As shown in Figure 1, being connect the present embodiment provides a kind of electric quantity detecting circuit with battery BAT, including buck converter U1
With voltage detector U2, voltage input end Vin connection the battery BAT's, buck converter U1 of buck converter U1 is enabled
One end of EN connection first resistor R1 and second resistance R2 are held, the other end of first resistor R1 connects the voltage input end Vin,
The other end of second resistance R2 is grounded, and the voltage input end Vin is grounded after being also connected with first capacitor C1；Buck converter U1's
End of convert SW the first inductance of connection L1 is followed by voltage output end OUT, is grounded after voltage output end OUT the second capacitor of connection C2, drop
The other end of one end of feedback end FB the connection 3rd resistor R3 and the 4th resistance R4 of pressure converter U1,3rd resistor R3 connects institute
Voltage output end OUT, the other end ground connection of the 4th resistance R4 are stated, the feedback end FB of buck converter U1 is also connected with the 5th electricity
Resistance R5 is followed by the drain electrode of metal-oxide-semiconductor Q1, the source electrode ground connection of MOS pipe Q1, the detection of the grid connection voltage detector U2 of metal-oxide-semiconductor Q1
Input terminal V2in, the ground terminal ground connection of voltage detector, the detection output V2out connection of the voltage detector decompression conversion
The voltage input end of device.
In the present embodiment, the metal-oxide-semiconductor Q1 is N-MOS pipe.
In the present embodiment, the battery BAT exports 2.5~4.2V voltage.
In the present embodiment, the buck converter U1 is depressured conversion chip using the DC/DC of ME3104 model.
ME3104 is a small package, has strong load capacity, high-frequency synchronous step-down DC-DC converter, supports Li+/Li
Polymer battery, multiple alkalinity/nickel-metal hydride batteries, USB and other types power supply application.ME3104 uses the control of constant frequency current type PWM
Molding formula makes it have preferable stability and transient response, and Operating quiescent current is extremely low.
In the present embodiment, the voltage detector U2 uses the voltage checking chip of ME2803 model.
ME2803 series is a high-precision low-power consumption voltage detector, is manufactured using CMOS technology technology, and voltage is detected
Accuracy is high, and temperature drift is small.
The course of work of the utility model electric quantity detecting circuit are as follows:
Battery BAT export 2.5~4.2V voltage to buck converter U1 voltage input end Vin, buck converter U1's
The drain electrode of feedback end FB connection NMOS tube Q1, the detection input V2in of the grid connection voltage detector U2 of NMOS tube Q1, electricity
The detection output V2out of detector U2 is pressed to connect again with battery BAT, voltage detector U2 is also reset chip, passes through NMOS
Manage the voltage of input voltage detector U2 processed；The DC high voltage of input is converted to DC low-voltage by buck converter U1
It is exported through the first inductance L1 from voltage output end OUT after end of convert SW output.The calculating of electric quantity detecting circuit output voltage is public
Formula is as follows:
BAT=2.5~4.2V；R1=150K, R2=180K, R3=150K, R4=180K, R5=220K, decompression conversion
Device U1 is 0.6 as the step-down coefficient of DC-DC reduction voltage circuit；
In BAT > 3.3V, OUT ≈ 1.5V；Output voltage OUT calculation formula 1 is as follows:
OUT=0.6 × [1+R1/ (R2-R3) (R2+R3)] ≈ 0.6 × (1+1.51) ≈ 1.51V；
In BAT≤3.3V, OUT ≈ 1.1V；Output voltage OUT calculation formula 2 is as follows:
OUT=0.6 × (1+R1/R2)=0.6 × (1+150K/180K) ≈ 0.6 × (1+0.83) ≈ 1.1V.
As shown in Figure 1, in electric quantity detecting circuit provided in this embodiment, the parallel connection of the 4th resistance R4 and the 5th resistance R5
Resistance is 99K, and in NMOS tube Q1 conducting, output voltage is that the result that calculation formula 1 calculates is about 1.51V；In NMOS tube Q1
When disconnection, output voltage is that the result that calculation formula 2 calculates is about 1.1V.
In the present embodiment, first resistor R1 and second resistance R2 plays the role of Cross prevention in circuit, and principle is such as
Under: the enable end EN of buck converter U1 is worked normally when being higher than 1.5V, and the over-discharge voltage of battery BAT is 2.7V, works as battery
When voltage is to 2.8V, first resistor R1 and second resistance R2 is divided so that the voltage of enabled foot is lower than 1.5V, to play
The effect of Cross prevention.
To sum up, electric quantity detecting circuit provided in this embodiment realizes the technical effect for only detecting high and low two grades of electricity, In
When battery power voltage is greater than 3.3V, the high electric power detection voltage of 1.5V is exported, is less than or equal to 3.3V in battery power voltage
When, the low battery detection voltage for exporting 1.1V improves electric power detection accuracy to simplify electric power detection process.
Above-described embodiment is the preferable embodiment of the utility model, but the embodiments of the present invention is not by above-mentioned
The limitation of embodiment, it is made under other any spiritual essence and principles without departing from the utility model to change, modify, replacing
In generation, simplifies combination, should be equivalent substitute mode, is included within the protection scope of the utility model.
Claims (5)
1. a kind of electric quantity detecting circuit, connect with battery, it is characterised in that: including buck converter and voltage detector, decompression
The voltage input end of converter connects the battery, and the enable end of buck converter connects the one of first resistor and second resistance
End, the other end of first resistor connect the voltage input end, the other end ground connection of second resistance, the voltage input end connection
It is grounded after first capacitor；The end of convert of buck converter connects the first inductance and is followed by voltage output end, voltage output end connection the
It is grounded after two capacitors, one end of feedback end the connection 3rd resistor and the 4th resistance of buck converter, the other end of 3rd resistor
The voltage output end, the other end ground connection of the 4th resistance are connected, the feedback end of buck converter is also connected with the 5th resistance
It is followed by the drain electrode of metal-oxide-semiconductor, the source electrode ground connection of metal-oxide-semiconductor, the detection input of the grid connection voltage detector of metal-oxide-semiconductor, voltage inspection
The ground terminal ground connection of device is surveyed, the detection output of voltage detector connects the voltage input end of the buck converter.
2. electric quantity detecting circuit according to claim 1, it is characterised in that:
The metal-oxide-semiconductor is N-MOS pipe.
3. electric quantity detecting circuit according to claim 1, it is characterised in that:
The battery exports 2.5~4.2V voltage.
4. electric quantity detecting circuit according to claim 1, it is characterised in that:
The buck converter is depressured conversion chip using the DC/DC of ME3104 model.
5. electric quantity detecting circuit according to claim 1, it is characterised in that:
The voltage detector uses the voltage checking chip of ME2803 model.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821846810.9U CN209570677U (en) | 2018-11-10 | 2018-11-10 | A kind of electric quantity detecting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821846810.9U CN209570677U (en) | 2018-11-10 | 2018-11-10 | A kind of electric quantity detecting circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209570677U true CN209570677U (en) | 2019-11-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821846810.9U Expired - Fee Related CN209570677U (en) | 2018-11-10 | 2018-11-10 | A kind of electric quantity detecting circuit |
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| Country | Link |
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| CN (1) | CN209570677U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110658468A (en) * | 2019-09-17 | 2020-01-07 | 安徽容知日新科技股份有限公司 | Battery state detection device |
-
2018
- 2018-11-10 CN CN201821846810.9U patent/CN209570677U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110658468A (en) * | 2019-09-17 | 2020-01-07 | 安徽容知日新科技股份有限公司 | Battery state detection device |
| CN110658468B (en) * | 2019-09-17 | 2021-12-07 | 安徽容知日新科技股份有限公司 | Battery state detection device |
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20191101 Termination date: 20211110 |
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| CF01 | Termination of patent right due to non-payment of annual fee |