CN209264929U - A kind of voltage detecting circuit and battery capacity prompt system - Google Patents
A kind of voltage detecting circuit and battery capacity prompt system Download PDFInfo
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- CN209264929U CN209264929U CN201821684723.8U CN201821684723U CN209264929U CN 209264929 U CN209264929 U CN 209264929U CN 201821684723 U CN201821684723 U CN 201821684723U CN 209264929 U CN209264929 U CN 209264929U
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Abstract
The utility model provides a kind of voltage detecting circuit and battery capacity prompt system.Voltage detecting circuit includes digital circuit, the first output end output digit signals, second output terminal output frequency control signal；Conversion circuit, input terminal couple the first output end of digital circuit；And comparison circuit, first input end receive the voltage signal for characterizing voltage to be detected, the second input terminal couples the output end of conversion circuit, and output end couples the input terminal of digital circuit.Voltage detecting circuit and battery capacity prompt system in above-described embodiment, two pins that detection has only taken up digital circuit can be realized, and be conducive to the extension of the other functions of digital circuit.The complexity, volume and cost for reducing system simultaneously are conducive to the system integration, and the frequency control signal exported is conducive to realize illumination and capacity prompt multiplexing by an illuminating device, improves the reliability of the more severe portable power tool of working environment.
Description
Technical field
The utility model relates to electronic circuits, and in particular to voltage detecting circuit and battery capacity prompt system.
Background technique
To portable power tool, because that may there is no power supply, or use power supply line to work belt in a few thing occasion
It is inconvenient to come, therefore is had great advantages using battery.However, unexpected not enough of battery capacity can cause to perplex to work,
Therefore, the instruction of battery charge level is also vital in order to charge, prevent to power off suddenly in time.
In a kind of circuit control of portable power tool, in order to reduce research and development cost, facilitate expansion control function, adopt
With digit chip.Fig. 1 shows the battery capacity detection scheme based on digit chip in a kind of correlation technique.In the program
In, digital circuit exports the digital signal of the different reference quantities of multiple instructions, using multiple digital-to-analogues (A/D) converter, by multiple numbers
Word signal is converted into analog references amount, then carries out analog references amount with the voltage signal Vs of indicating battery electric quantity level respectively
Compare, then multiple comparison signals are inputted into digital circuit, carries out the judgement of battery capacity.
In this fashion, digital circuit needs to provide multiple digital reference signals, and receives multiple comparison signals, occupies
More pin.When the required precision of detection improves, the pin of digit chip cannot even meet again.And it occupies excessive
Pin also interfere the expansions of the other functions of digital circuit.In addition, the program additionally uses multiple A/D converters and multiple ratios
Compared with device, the volume and cost of system are considerably increased.
Utility model content
One purpose of the utility model be to propose one or more defects in a kind of elimination correlation technique based on number
The voltage detecting circuit and battery capacity prompt system of word circuit.
The one aspect of the utility model proposes a kind of voltage detecting circuit, comprising:
Digital circuit has the first output end, an input terminal and second output terminal, wherein the first output end output number letter
Number, second output terminal output frequency controls signal；
Conversion circuit has input terminal and output end, the first output end of the input terminal coupling digital circuit of conversion circuit；
And
Comparison circuit has first input end, the second input terminal and output end, and wherein the first input end of comparison circuit connects
Receive the voltage signal for characterizing voltage to be detected, the output end of the second input terminal coupling conversion circuit of comparison circuit, comparison circuit
Output end coupling digital circuit input terminal.
In one embodiment, digital circuit includes micro-control unit (MCU).
In one embodiment, digital signal adjusts duty ratio at times.
In one embodiment, conversion circuit includes differential circuit.
In one embodiment, conversion circuit includes:
Resistance has a first end and a second end, the first output end of the first end coupling digital circuit of resistance；And
Capacitor has a first end and a second end, wherein the second end of the first end coupling resistance of capacitor and comparison circuit
The second end of second input terminal, capacitor couples ground terminal.
In one embodiment, control signal is input to the input terminal of illumination driving circuit.
In one embodiment, voltage to be detected couples the output end of battery in portable power tool.
In one embodiment, digital circuit is located on a microcontroller chip, and conversion circuit and comparison circuit are located at a mould
The outside of mimetic crystal on piece, microcontroller chip and simulated wafer has packaging part, and packaging part holds microcontroller chip and simulated wafer
In being contained in.
The utility model another aspect provides a kind of battery capacity prompt systems, comprising:
Battery；
Voltage detecting circuit described in any embodiment as above, wherein the output end of voltage to be detected coupling battery；And
Illumination driving circuit has input terminal and output end, and wherein the input terminal of illumination driving circuit couples digital circuit
Second output terminal, the output end of illumination driving circuit couples LED light.
In one embodiment, illumination driving circuit includes transistor, and wherein the control terminal of transistor couples digital circuit
Second output terminal, the first end of transistor couples LED light, and the second end of transistor couples ground terminal.
Voltage detecting circuit and battery capacity prompt system in above-described embodiment, detection have only taken up digital circuit
Two pins can be realized, and be conducive to the extension of the other functions of digital circuit.Reduce simultaneously the complexity of system, volume and at
This, is conducive to the system integration, and the frequency control signal exported is conducive to realize illumination and capacity prompt by an illuminating device
Multiplexing, improves the reliability of the more severe portable power tool of working environment.
Detailed description of the invention
Fig. 1 shows the battery capacity detection scheme based on digit chip in a kind of correlation technique；
Fig. 2 shows the voltage detecting circuit schematic diagrames based on digital circuit according to an embodiment of the present invention；
Fig. 3 shows the battery capacity prompt system schematic diagram according to an embodiment of the present invention；
Fig. 4 shows the waveform diagram according to an embodiment of the present invention；
Fig. 5 shows the schematic diagram of the portable power tool according to an embodiment of the present invention.
Identical label represents the same or similar component or composition in different schematic diagrames.
Specific embodiment
For a further understanding of the utility model, the utility model preferred embodiment is retouched below with reference to embodiment
It states, but it is to be understood that these descriptions are only the feature and advantage for further illustrating the utility model, rather than practical to this
The limitation of novel claim.
Just for several typical embodiments, the utility model is not limited to the model of embodiment description for the description of the part
It encloses.Some technical characteristics in same or similar prior art means and embodiment are replaced mutually also in the utility model
In the range of describe and claim.
" electric coupling " in specification includes to be directly connected to, and also comprising being indirectly connected with, such as passes through electrically-conducting medi such as conductor
Connection, wherein the electrically-conducting medi can contain parasitic inductance or parasitic capacitance.It may additionally include and same or similar function can be achieved
The connection of other active devices or passive device can be passed through on the basis of purpose, such as pass through switch, follow circuit circuit or portion
The connection of part.
Fig. 2 shows the voltage detecting circuit schematic diagrames based on digital circuit according to an embodiment of the present invention.Electricity
Pressing detection circuit includes digital circuit 21, conversion circuit 22 and comparison circuit 23, for detecting the voltage water of voltage Vs to be detected
It is flat.Wherein conversion circuit 22 and comparison circuit 23 are analog circuit.Digital circuit 21 has the first output end do1, an input terminal
Din and second output terminal Ctrl, wherein the first output end do1 exports a digital signal.In one embodiment, first is defeated
The digital signal do1 of outlet output provides the reference voltage of different threshold values by adjusting duty ratio.In a specific embodiment
In, digital circuit exports the digital signal of different duty in the first output end do1 at times, for providing different thresholds at times
The reference voltage of value, signal do1 shown in Figure 4, will be described in detail later.
Conversion circuit 22 has input terminal and output end, wherein the of the input terminal coupling digital circuit 21 of conversion circuit 22
One output end do1, the output end of conversion circuit 22 provide conversion voltage Vf.Convert the corresponding number electricity of voltage level of voltage Vf
The reference voltage level that the digital signal do1 that road 21 provides is represented.
In one embodiment, conversion circuit 22 includes filter circuit, for exporting filtering voltage Vf.In one embodiment
In, filter circuit includes differential circuit.In the illustrated embodiment, conversion circuit includes resistance R and capacitor C.Wherein resistance R
It has a first end and a second end, the first output end do1 of the first end coupling digital circuit 21 of resistance R.Capacitor C has first
End and second end, wherein the second input terminal of the second end of the first end coupling resistance R of capacitor C and comparison circuit 23, capacitor C's
Second end couples ground terminal.
Certainly, conversion circuit 22 can also have other structures, for digital signal do1 to be converted into analog signal Vf.
In one embodiment, analog Vf is controlled by the duty ratio of digital signal do1, it is preferable that reference signal Vf direct ratio
In the duty ratio of do1.
Comparison circuit 23 has first input end, the second input terminal and output end, wherein the first input of comparison circuit 23
End receives the voltage signal Vs for characterizing voltage to be detected, the output of the second input terminal coupling conversion circuit 22 of comparison circuit 23
End, the input terminal din of the output end coupling digital circuit 21 of comparison circuit 23.Output of the digital circuit 21 based on comparison circuit 23
Signal din obtains the level of voltage Vs to be detected, and provides control signal in the second output terminal Ctrl of digital circuit 21, wherein
Signal Ctrl is controlled to generate based on the level of voltage Vs to be detected.In one embodiment, the duty ratio of signal Ctrl is being controlled just
Than in voltage Vs to be detected.
In the illustrated embodiment, the first input end of comparison circuit 23 be inverting input terminal, the second of comparison circuit 23
Input terminal is non-inverting input terminal, and when voltage signal Vs is lower than analog Vf, comparator exports high level.Pass through variation
Analog Vf correspond to the output situation of comparison circuit 23 again, digital circuit 21 can get the level of voltage to be detected.
Certainly, in another embodiment, the first input end for the voltage signal Vs that the reception of comparison circuit characterizes voltage to be detected can
The second input terminal for non-inverting input terminal, comparison circuit is inverting input terminal, by accordingly changing the judgement mark in digital circuit
Identical detection can be realized in standard.
In one embodiment, the output end of voltage Vs coupling battery to be detected, characterizes battery dump energy.In a reality
It applies in example, control signal Ctrl is input to the input terminal of illumination driving circuit, and the water of electricity is indicated by control signal Ctrl
It is flat.In one embodiment, control signal Ctrl is frequency control signal, the frequency of control signal Ctrl and voltage water to be detected
Heisei inverse relationship, i.e., voltage to be detected is lower, and the flicker frequency of illuminating device is faster, prompts battery capacity fewer, having given makes
The intuitive capacity prompt of user.
In one embodiment, digital circuit 21 includes micro-control unit (MCU).In some embodiments, digital circuit
It can be CPLD (Complex Programmable Logic Device) chip or ARM (Advanced RISC
Microprocessor) chip or DSP (digital singnal processor) chip or FPGA (Field-
Programmable Gate Array) chip.
Detection mode and detection structure in this way are believed by providing different references by a digital signal at times
Number, and the output state by detecting comparison circuit 23 at times obtains the level of voltage Vs to be detected, has only taken up number
Two pins of circuit 21 can be realized, and be conducive to the extension of the other functions of digital circuit.And turn without additional digital-to-analogue
Chip is changed, without multiple comparison circuits are used, the complexity, volume and cost of system is reduced, is conducive to the system integration, has
Conducive to relatively severe such as moist, the such tool of vibration the reliability of this working environment of portable power tool is improved, fit
In applied among electric tool.
In one embodiment, digital circuit 21 is produced on a microcontroller chip, conversion circuit 22 and comparison circuit 23
Be produced on a simulated wafer, the outside of microcontroller chip and simulated wafer has a packaging part, packaging part by microcontroller chip and
Simulated wafer is accommodated in the inner, and forms multi-die package.In this way, circuit system system can be realized by an encapsulation chip, improve
The integrated level of system, improves the circuit reliability of portable power tool, is suitable for the application of among electric tool.
Fig. 3 shows the battery capacity prompt system schematic diagram according to an embodiment of the present invention.The battery capacity mentions
Show that system includes voltage detecting circuit and illumination driving circuit 34.The battery of voltage detecting circuit detection characterization battery dump energy
31 output voltage Vbat, and control signal Ctrl is provided for driving illuminating device 35 according to the output voltage Vbat of battery 31
The prompt of battery capacity is carried out, wherein voltage to be detected is the output voltage Vbat of battery 31.
Voltage detecting circuit includes digital circuit 21, conversion circuit 22 and comparison circuit 23, and it is corresponding specifically to can refer to Fig. 2
The description as described in voltage detecting circuit at other positions in embodiment and the application, which is not described herein again.
Voltage detecting circuit can also further comprise sample circuit 32, for receiving the output voltage Vbat of battery 31, obtain
Obtain sampled signal Vs.In this way, signal Vs can characterize voltage Vbat to be detected.In one embodiment, sample circuit includes voltage
Divider, digital circuit can export the duty ratio of corresponding digital signal do1 according to the dividing ratios of voltage divider, for standard
Really obtain the voltage level of voltage Vbat to be detected.
Voltage detecting circuit can also further comprise voltage conversion circuit, for by the output voltage Vbat of battery into mistake
Transformation provides the supply voltage for being suitble to driving digital circuit 21.
The signal that digital circuit 21 can be exported according to comparison circuit 23, the digital signal exported in conjunction with digital circuit itself
Do1 judges the level of voltage Vbat to be detected, and further according to the water of the voltage Vbat to be detected of reflection battery dump energy
It puts down to export illumination drive signal Ctrl.In a preferred embodiment, illumination drive signal Ctrl prompts electricity by frequency
The electricity in pond, electricity is lower, and warning light flicker frequency is faster.
Illumination driving circuit 34 has input terminal and output end, wherein the input terminal coupling number electricity of illumination driving circuit 34
The second output terminal Ctrl on road 21, output end coupling light emitting diode (LED) of illumination driving circuit 34 is for driving LED light
35。
Illumination driving circuit 34 includes transistor Q, and wherein the second of the control terminal coupling digital circuit 21 of transistor Q is defeated
The cathode of first end coupling LED light 35 of the outlet for receiving control signal Ctrl, transistor Q, the anode of transistor Q couple electricity
The output end in pond is for receiving supply voltage Vbat.The second end coupling ground terminal of transistor Q or other reference voltage terminals.This
The turn-on and turn-off of sample, LED light 35 are corresponding with the control signal Ctrl that the second output terminal of digital circuit 21 exports.Work as control
When signal Ctrl is high level, transistor Q conducting, LED light is lighted.When controlling signal Ctrl is low level, transistor Q is closed
Disconnected, LED lamp extinguishes.By the frequency of control control signal Ctrl, the flicker frequency of LED light can be accordingly adjusted.
Illumination driving circuit 34 can also further comprise the bleeder circuit as shown in the figure being made of two resistance or other
Circuit provide the control terminal voltage for being suitable for driving transistor Q for converting the amplitude of digital signal Ctrl.Illumination
Driving circuit 34 can also further comprise that other circuits such as protect circuit, because being associated with system with the present application theme less, this
In repeat no more.
In one embodiment, the frequency for controlling signal Ctrl is inversely related with voltage level Vbat or Vs to be detected,
I.e. with the reduction of voltage level Vbat to be detected, LED light flicker frequency increases.When voltage Vbat is higher than first threshold voltage
When, LED holding is always on, and when voltage Vbat is lower than first threshold voltage, LED light starts to flash, as voltage Vbat is further
When falling below second threshold voltage, LED flicker frequency is accelerated, and wherein second threshold voltage is lower than first threshold voltage, the
Normal voltage of one threshold voltage lower than cell voltage Vbat is horizontal.LED flicker frequency can be multi gear, with cell voltage
The reduction of Vbat and accelerate.In this way, LED can be used as illumination and battery capacity indication multiplexing lamp is merely provided for shining when electricity is normal
It is bright；When electricity is lower, for prompting charge level, user is charged in time, it is ensured that work normally.This photograph
Bright and battery capacity indication multiplexing lamp is by an only lamp instead of the additional multiple fingers of a headlamp commonly used in the prior art
Show more lamp schemes of the battery capacity indication lamp of charge level.
Certainly, when voltage Vbat is higher than first threshold voltage, LED light can also keep state of often going out, and be only used for prompting
Charge level.In another embodiment, it when voltage Vbat is higher than first threshold voltage, can be controlled by an external switch
Whether LED is to be always on or often go out, for selecting LED light as illumination and battery capacity indication multiplexing lamp.
Be analog circuit other than digital circuit 21 in battery capacity prompt system, facilitate by the analog circuit with just
Other analog circuits in portable electric tool circuit system are produced on together in a chip, in this way, portable power tool is electric
Road system only includes two chips.In one embodiment, portable power tool circuit system includes a general digital chip
Intend chip with a custom mold.Portable power tool circuit system can also further comprise an illumination and battery capacity indication multiplexing lamp
And other a small amount of function elements, reduce the number of chips of system and electric conductor that needs connect, reduces the complexity of system
Degree, is conducive to the raising of system reliability, and the sealing for being also beneficial to circuit connection point reduces electric leakage probability.Exist for possible application
For humidity, high temperature, the electric tool in vibration environment, the simplification of circuit system has very big meaning.
Fig. 4 shows the waveform diagram according to an embodiment of the present invention.The output of the first output end of digital circuit
Digital signal do1 Ts in each detection cycle exports multiple pulses at times, wherein the corresponding digital signal of each pulse accounts for
Empty ratio successively increases.The digital signal do1 of diagram duty ratio in a detection cycle Ts successively increases, certainly, in others
In embodiment, digital signal do1 duty ratio in a detection cycle Ts can also be reduced successively.In the illustrated embodiment,
In a detection cycle Ts, each pulse is higher than previous pulse.Certainly, in other embodiments, detected at one
, can also be identical with the duty ratio of every two or multiple pulses in cycle T s, but it is higher than the duty ratio of previous group pulse.Digital signal
Do1 can repeat the digital signal waveform in a upper detection cycle, repetitive cycling in next detection cycle.Certainly, digital
Different waveforms can also be presented in signal do1 in multiple detection cycles.
Referring to situation 41, when the duty ratio of digital signal do1 successively increases, conversion voltage Vf is gradually risen, in the time
T1, conversion voltage Vf are higher than voltage Vs to be detected, and the signal din of comparison circuit output is second electrical level by the first level conversion,
Digital circuit receive signal din, according to signal din by the first level conversion be second electrical level time t1, determine that t1 is corresponding
The duty ratio of digital signal do1 so that it is determined that voltage Vs is horizontal, and is exported according to voltage Vs level at the end each detection cycle ts
Corresponding control signal Ctrl.In the illustrated embodiment, control signal Ctrl is at the end each detection cycle ts according to the detection
The testing result in period is adjusted and exports.Certainly, in other embodiments, control signal Ctrl can also detected
Input signal din is adjusted after the time t1 of second electrical level immediately by the first level conversion.In the illustrated embodiment,
Controlling signal Ctrl has first frequency.
Referring to situation 42, when signal Vs to be detected is further decreased, signal din is second electrical level by the first level conversion
The corresponding digital signal do1 duty ratio of time t2 reduce, the frequency for controlling signal Ctrl at this time has second frequency, wherein the
Two frequencies are higher than first frequency.For electric quantity prompt system shown in Fig. 4, when electricity further decreases, the sudden strain of a muscle of LED light
Bright frequency is accelerated, and the level of electricity can be prompted with this.
Referring to situation 43, when signal Vs to be detected is further decreased, signal din is second electrical level by the first level conversion
The corresponding digital signal do1 duty ratio of time t3 also further decrease, control signal Ctrl frequency further increase.In conjunction with
Electric quantity prompt system shown in Fig. 4, when the signal Vs of the characterization electricity detected is lower, LED light flicker frequency is faster, to making
The intuitive charge level prompt of user.
If voltage signal Vs is greater than or equal to the corresponding analog of maximum duty cycle in maximum do1 signal, controllably
System exports the control signal Ctrl of permanent high level, is always on for controlling LED light.In this way, exterior only can by a lamp come
Illumination and battery capacity indication multiplexing are realized simultaneously.
Certainly, in another embodiment, if voltage signal Vs is greater than or equal to maximum duty cycle pair in maximum do1 signal
The analog answered can control the permanent low level control signal Ctrl of output, often go out for controlling LED light.
The pulse width and frequency of signal do1 and Ctrl shown in Fig. 4 are given for example only.In practical applications, it controls
The frequency of signal Ctrl can be far below the frequency of digital signal do1.
In other examples, control signal Ctrl can also prompt the charge level of battery using other modes.
For example, the time of LED light single shutdown is longer, the prompt of Lai Jinhang electricity when electricity is lower.Which can also be in low battery
When electric quantity prompt system occupy few electric energy as far as possible, improve system battery utilization rate.
Fig. 5 shows the schematic diagram of the portable power tool according to an embodiment of the present invention.As shown, portable
50 front end of formula electric power tools includes that an illumination and battery capacity indication are multiplexed lamp 51, for providing operation illumination and instruction battery simultaneously
Charge level.Preferably, electric power tools include that one and only one illumination and battery capacity indication are multiplexed lamp 51, without others
Headlamp or battery capacity indication lamp.The illumination and battery capacity indication multiplexing lamp 31 have flashing function, are used to indicate the level of electricity.?
In one embodiment, the frequency of flashing corresponds to indicating battery electric quantity level, and with the reduction of electricity, the frequency of flashing adds
Fastly.The function of illumination and battery capacity indication is provided simultaneously by a lamp, a piece electric wire of setting is only needed between lamp and circuit module,
Avoid be arranged outside portable power tool in the prior art multiple LED light be respectively used to guidance lighting and charge level to
The defect of more electric wires is set inside portable instrument, and the circuit for improving system is simply spent and reliability, and close convenient for being arranged
Seal structure efficiently avoids the possibility such as electric leakage, is suitable for portable power tool and uses.
The method and its core concept of the above embodiments are only used to help understand the utility model.It should refer to
It out, for those skilled in the art, without departing from the principle of this utility model, can also be to this
Some improvement and modification can also be carried out for utility model, these improvement and modification also fall into the protection scope of the utility model claims
It is interior.
Claims (10)
1. a kind of voltage detecting circuit characterized by comprising
Digital circuit has the first output end, an input terminal and second output terminal, wherein the first output end output digit signals,
Second output terminal output frequency controls signal；
Conversion circuit has input terminal and output end, the first output end of the input terminal coupling digital circuit of conversion circuit；And
Comparison circuit has first input end, the second input terminal and output end, and wherein the first input end of comparison circuit receives table
Levy the voltage signal of voltage to be detected, the output end of the second input terminal coupling conversion circuit of comparison circuit, comparison circuit it is defeated
The input terminal of outlet coupling digital circuit.
2. voltage detecting circuit according to claim 1, which is characterized in that digital circuit includes micro-control unit (MCU).
3. voltage detecting circuit according to claim 1, which is characterized in that digital signal adjusts duty ratio at times.
4. voltage detecting circuit according to claim 1, which is characterized in that conversion circuit includes differential circuit.
5. voltage detecting circuit according to claim 1, which is characterized in that conversion circuit includes:
Resistance has a first end and a second end, the first output end of the first end coupling digital circuit of resistance；And
Capacitor has a first end and a second end, wherein the second of the second end of the first end coupling resistance of capacitor and comparison circuit
The second end of input terminal, capacitor couples ground terminal.
6. voltage detecting circuit according to claim 1, which is characterized in that control signal is input to illumination driving circuit
Input terminal.
7. voltage detecting circuit according to claim 1, which is characterized in that voltage to be detected couples portable power tool
The output end of interior battery.
8. voltage detecting circuit according to claim 1, which is characterized in that digital circuit is located on a microcontroller chip,
Conversion circuit and comparison circuit are located on a simulated wafer, and the outside of microcontroller chip and simulated wafer has packaging part, encapsulation
Microcontroller chip and simulated wafer are accommodated in the inner by part.
9. a kind of battery capacity prompt system characterized by comprising
Battery；
Such as the described in any item voltage detecting circuits of claim 1-8, wherein the output end of voltage to be detected coupling battery；And
Illumination driving circuit has input terminal and output end, wherein the of the input terminal coupling digital circuit of illumination driving circuit
The output end of two output ends, illumination driving circuit couples LED light.
10. battery capacity prompt system according to claim 9, which is characterized in that illumination driving circuit includes transistor,
The wherein second output terminal of the control terminal coupling digital circuit of transistor, the first end of transistor couple LED light, and the of transistor
Two ends couple ground terminal.
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| CN201821684723.8U CN209264929U (en) | 2018-10-17 | 2018-10-17 | A kind of voltage detecting circuit and battery capacity prompt system |
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| CN201821684723.8U CN209264929U (en) | 2018-10-17 | 2018-10-17 | A kind of voltage detecting circuit and battery capacity prompt system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109298339A (en) * | 2018-10-17 | 2019-02-01 | 杭州百隆电子有限公司 | A kind of voltage detecting circuit, battery capacity prompt system and voltage detection method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109298339A (en) * | 2018-10-17 | 2019-02-01 | 杭州百隆电子有限公司 | A kind of voltage detecting circuit, battery capacity prompt system and voltage detection method |
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