CN107677876A - The dynamic measurement method and device of a kind of bipolar signal - Google Patents
The dynamic measurement method and device of a kind of bipolar signal Download PDFInfo
- Publication number
- CN107677876A CN107677876A CN201610624817.5A CN201610624817A CN107677876A CN 107677876 A CN107677876 A CN 107677876A CN 201610624817 A CN201610624817 A CN 201610624817A CN 107677876 A CN107677876 A CN 107677876A
- Authority
- CN
- China
- Prior art keywords
- reference point
- signal
- polarity
- measured signal
- circuit
- Prior art date
- Legal status (The legal status 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 status listed.)
- Withdrawn
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/14—Indicating direction of current; Indicating polarity of voltage
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
- G01R31/3842—Arrangements for monitoring battery or accumulator variables, e.g. SoC combining voltage and current measurements
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Arrangements For Transmission Of Measured Signals (AREA)
Abstract
The invention discloses a kind of dynamic measurement method of bipolar signal and device, is related to bipolar signal fields of measurement, and methods described includes：The polarity of measured signal in circuit is detected；If the polarity for detecting measured signal is positive polarity, the first reference point is selected as measuring circuit reference point, and measure to measured signal；If the polarity for detecting measured signal is negative polarity, the second reference point is selected as measuring circuit reference point, and measure to measured signal.The present invention realizes the measurement of bipolar signal, circuit is simple, and fault rate is low, and cost is low by switching reference point.
Description
Technical field
The present invention relates to bipolar signal fields of measurement, the dynamic measurement method and dress of more particularly to a kind of bipolar signal
Put.
Background technology
There are many scenes to need to measure two-way physical quantity, such as bi-directional air amount/flow velocity measurement in real life, store
Battery charging and discharging measurement etc..Physical quantity is two-way in such applications, such as electric current flows into battery during battery charging, puts
Electric current flows out battery when electric, and measure that the sensor of this two-way physical quantity generally exports is bipolarity level, such as is charged
When electric current for just, electric current is negative during electric discharge.
Positive signal measurement is fairly simple, and Signal sampling and processing can only handle positive signal, and minus polarity signal is then
More complicated, one of which method is that minus polarity signal is converted to positive signal, such as increase adder circuit negative pole
Property signal level be lifted to more than zero level, minus polarity signal is become positive signal, then again with conventional measuring method
Measurement.Another method is increase negative voltage so that signal to be measured falls between generating positive and negative voltage.But no matter which kind of side
Method, it is required for increasing operation amplifier circuit, reference source etc., circuit is complicated, and power consumption is big.
The content of the invention
The technical problem that the technical scheme that provides according to embodiments of the present invention solves be how to realize it is a kind of simple bipolar
The dynamic measurement scheme of property signal.
A kind of dynamic measurement method of the bipolar signal provided according to embodiments of the present invention, including：
The polarity of measured signal in circuit is detected；
If the polarity for detecting measured signal is positive polarity, the first reference point is selected as measuring circuit reference point, and
Measure to measured signal；
If the polarity for detecting measured signal is negative polarity, the second reference point is selected as measuring circuit reference point, and
Measure to measured signal.
Preferably, the step of polarity of the measured signal in circuit detects includes：
According to the physical quantity variation of measured signal, the polarity of measured signal is detected.
Preferably, by controlling reference point switching circuit, the first reference point or the second reference point are selected as measuring circuit
Reference point.
Preferably, the reference point switching circuit includes single-pole double-throw switch (SPDT).
Preferably, the measured signal is the current signal of battery, utilizes the current sense connected with the battery
Device is acquired to the current signal of the battery, and by one end of the remote battery terminal negative of the current sensor
As the first reference point, using one end of the close battery terminal negative of the current sensor as the second reference point..
A kind of dynamic measurement device of the bipolar signal provided according to embodiments of the present invention, including：
Check up polarity module, for being detected to the polarity of the measured signal in circuit；
Dynamic measurement module, if the polarity for detecting measured signal is positive polarity, the first reference point is selected as measurement
Circuit reference point, and measure to measured signal, if the polarity for detecting measured signal is negative polarity, select the second reference
Point is used as measuring circuit reference point, and measures to measured signal.
Preferably, the Check up polarity module detects the polarity of measured signal according to the physical quantity variation of measured signal.
Preferably, the dynamic measurement module selects the first reference point or the second ginseng by controlling reference point switching circuit
Examination point is as measuring circuit reference point.
Preferably, the reference point switching circuit includes single-pole double-throw switch (SPDT).
Preferably, the measured signal is the current signal of battery, and the dynamic measurement module utilizes and the electric power storage
The current sensor of pond series connection is acquired to the current signal of the battery, and by the current sensor away from described
One end of battery terminal negative as the first reference point, using one end of the close battery terminal negative of the current sensor as
Second reference point.
Technical scheme provided in an embodiment of the present invention has the advantages that：
The embodiment of the present invention realizes the measurement to bipolar signal parameter by the reference point of dynamic handover measurement circuit,
Some reference point is selected when measuring a direction signal, another reference is switched to when measuring another direction signal
Point, traditional adder lifting incoming signal level is not needed so, on circuit, it is not required that complicated bipolar signal measurement
Circuit, it is only necessary to which simple switching reference point, circuit is simple, and fault rate, power consumption and cost are all than relatively low.
Brief description of the drawings
Fig. 1 is the dynamic measurement method block diagram of bipolar signal provided in an embodiment of the present invention；
Fig. 2 is the dynamic measurement device block diagram of bipolar signal provided in an embodiment of the present invention；
Fig. 3 is the dynamic measurement module structure chart for the bipolar signal that another embodiment of the present invention provides；
Fig. 4 is the dynamic measuring circuit structure chart for the bipolar signal that another embodiment of the present invention provides；
Fig. 5 is the dynamic measuring circuit structure chart for the bipolar signal that another embodiment of the present invention provides.
Embodiment
Below in conjunction with accompanying drawing to a preferred embodiment of the present invention will be described in detail, it will be appreciated that described below is excellent
Select embodiment to be merely to illustrate and explain the present invention, be not intended to limit the present invention.
Fig. 1 is the dynamic measurement method block diagram of bipolar signal provided in an embodiment of the present invention, as shown in figure 1, step bag
Include：
Step S101：The polarity of measured signal in circuit is detected.
Specifically, according to the physical quantity variation of measured signal, the polarity of measured signal is detected.
The measured signal can be voltage, electric current, resistance, frequency etc., and the change of these physical quantitys can be converted to electricity
Signal is pressed, so as to measure the change of measured physical quantity by measuring the amplitude of voltage.For example, using frequency pressure converter, will not
Same frequency is transformed to different voltage；The size of electric current is measured by measuring the both end voltage for the resistance accessed of connecting.
A reference signal is preset, obtained signal will be measured compared with the reference signal, if greater than this
Reference signal, then be judged as a kind of polarity, is otherwise judged as another polarity, and typical circuit is comparator or subtracter.With
Exemplified by polarity of voltage judges, voltage signal to be measured accesses zero-crossing comparator, if voltage to be measured is judged as just believing more than 0V
Number, it is judged as negative signal if voltage is no more than 0V.
Step S102：According to testing result, switch reference point, realize measurement to measured signal.Specifically, if detection
Polarity to measured signal is positive polarity, then selects the first reference point as measuring circuit reference point, and carry out to measured signal
Measurement；If the polarity for detecting measured signal is negative polarity, the second reference point is selected as measuring circuit reference point, and treat
Signal is surveyed to measure.
By controlling reference point switching circuit, the first reference point or the second reference point are selected as measuring circuit reference point.
Wherein, reference point switching circuit can be single-pole double-throw switch (SPDT).
When the current signal to battery measures, current sensor is connected with the battery, so as to detect
The current signal of battery., will using one end of the remote battery terminal negative of the current sensor as the first reference point
One end of the close battery terminal negative of the current sensor is as the second reference point.When battery charges, pass through control
Reference point switching circuit processed, the first reference point is selected as measuring circuit reference point, and carry out the measurement of charging current.Work as electric power storage
During tank discharge, by controlling reference point switching circuit, the second reference point is selected as measuring circuit reference point, and carry out electric discharge electricity
The measurement of stream.
The embodiment of the present invention is chosen the reference point suitable for signal measurement, entered according to the testing result of the polarity of measured signal
Row measurement.For example, according to the testing result of the polarity of measured signal, determine whether the current reference point of circuit is suitable to signal and surveys
Amount, if current reference point is suitable to signal measurement, according to the current reference point, is directly measured to measured signal,
If current reference point is unsuitable for signal measurement, the reference point suitable for signal measurement is switched to, and according to the reference after switching
Point, is measured to measured signal.
When the signal in circuit is bipolar signal, measuring circuit needs to measure the parameter of bipolar signal simultaneously, can
Can parameter include voltage, electric current, resistance, frequency etc., the embodiment of the present invention is realized pair by changing the reference point of measuring circuit
The measurement of bipolar signal parameter.
The mode that the embodiment of the present invention can manually or automatically switch, dynamic change the reference point of measuring circuit, survey
Amount circuit other parts need not change can and realize all measurement functions, with being needed in traditional bipolar signal measuring circuit
Adder is wanted to be compared with negative electricity source circuit, the embodiment of the present invention does not need adder or negative supply to realize that bipolarity is believed
Number measurement, and circuit realiration is simpler.
Fig. 2 is the dynamic measurement device block diagram of bipolar signal provided in an embodiment of the present invention, as shown in Fig. 2 including：Pole
Property detection module 10 and dynamic measurement module 20.
Check up polarity module 10, for being detected to the polarity of the measured signal in circuit.Specifically, Check up polarity
Module 10 detects the polarity of measured signal according to the physical quantity variation of measured signal.
Dynamic measurement module 20, if the polarity for detecting measured signal is positive polarity, the first reference point is selected as survey
Circuit reference point is measured, and is measured to measured signal, if the polarity for detecting measured signal is negative polarity, selects the second ginseng
Examination point measures to measured signal as measuring circuit reference point.Furtherly, dynamic measurement module 20 is joined by controlling
Examination point switching circuit, the first reference point or the second reference point are selected as measuring circuit reference point, wherein, reference point switching circuit
It can be single-pole double-throw switch (SPDT).
When the current signal to battery measures, current sensor is connected with the battery, so as to detect
The current signal of battery.Dynamic measurement module 20 using one end of the remote battery terminal negative of the current sensor as
First reference point, using one end of the close battery terminal negative of the current sensor as the second reference point.Work as battery
During charging, dynamic measurement module 20 selects the first reference point as measuring circuit reference point by controlling reference point switching circuit,
And carry out the measurement of charging current.When battery discharging, dynamic measurement module 20 is selected by controlling reference point switching circuit
Second reference point carries out the measurement of discharge current as measuring circuit reference point.
The Check up polarity module 10 of the embodiment of the present invention can perceive the polarity of measured signal, so that dynamic measurement module
20 is automatic or remind the reference point of user's manual switching measuring circuit according to the polarity of measured signal, so as to according to rational reference
Point, measure the parameter of two kinds of polar signals.Wherein, dynamic measurement module 20 uses reference point switching circuit (i.e. circuit switching dress
Put) switch between two or more reference points, by switching reference point, realize that bipolar signal measures.
The reference point switching circuit of the embodiment of the present invention can be automatically controlled switching reference point by circuit, can also artificial hand
Dynamic switching reference point.
Fig. 3 is the dynamic measurement module structure chart for the bipolar signal that another embodiment of the present invention provides, as shown in figure 3,
Including：Reference point switching circuit, control circuit (realize the function and dynamic measurement module 20 of Fig. 2 Check up polarity module 10
Reference point handoff functionality), and sensor circuit and measuring circuit (the measurement function of realizing dynamic measurement module 20).Wherein,
Sensor circuit is responsible for realizing the conversion of measured signal, various physical quantitys is converted to the electric signal of suitable circuit measuring, such as
Mass air flow sensor, water ga(u)ge, current sensor etc..Measuring circuit realizes the measurement to sensor electric signal, the electricity ginseng of measurement
Number includes voltage, electric current, resistance, frequency etc..When actually measuring bipolar signal, control circuit is used to control reference point to switch
Switching of the circuit between reference point.
Measured signal is converted to electric signal by sensor circuit, (such as is grounded for a fixed circuit reference point
Point), this electric signal is probably positive level when measurand changes, it is also possible to negative level, if changing another conjunction
Suitable circuit reference point, then original negative level can be changed into positive level.That is, the embodiment of the present invention is referred to by changing
The method of point, is changed into positive level signal by the measured signal of the negative level in bipolar signal.
The control circuit of the present embodiment can perceive the polarity of signal to be measured, automatic or remind according to the polarity of measured signal
User's manual switching measuring circuit reference point.That is, control circuit detects measured signal according to the change of measurand
Polarity, a reference point is selected when measured signal is positive level, measured signal selects another reference point when being negative level,
So that the negative level of script becomes positive level, circuitry for signal measurement processing is so convenient to.
The control circuit of the present embodiment realizes the switching of reference point, and switching supports control circuit to automatically switch, also backer
Work manual switching.
Fig. 4 is the dynamic measuring circuit structure chart for the bipolar signal that another embodiment of the present invention provides, as shown in figure 4,
The circuit is the current measurement circuit of battery, including following two measurement demands：
(1) during electricity consumption battery discharge current；
(2) charging current of battery is given in charging process.
Telecommunications accumulator charging/discharging circuit is as shown in figure 4, including battery, be serially connected in the current sense of battery terminal negative
Device, with electric loading, charger, control circuit, the switch functional module such as K1, K2 and K3.
In normal electricity consumption, electric current flows out from battery positive voltage, through switching K1, flowing back into storage with electric loading, sensor etc.
GND, it can be seen that flow to A ends from B ends in the electric current during electricity consumption on current sensor, A ends are with B terminal voltages
It is negative.
In charging process, electric current flows out from charger, flows into battery positive voltage through K2, is passed from battery terminal negative through electric current
Sensor returns to charger, it can be seen that the electric current in charging process on current sensor flows to B ends, A ends and B ends electricity from A ends
Press as just.
In measuring circuit, discharging with charging process, the voltage on current sensor is respectively positive and negative, is occurred
The voltage of two kinds of polarity.
Earth point (reference point) of traditional measuring circuit selection B ends as measuring circuit, A points voltage is high when so charging
In B point voltages, measuring circuit is it is seen that positive voltage, measurement have no problem.Because electric current from B points flows to A points during electric discharge, then A
Point voltage is less than B point voltages, because B points are earth points, then A point voltages are exactly negative value, measuring circuit it is seen that negative voltage,
Measurement encounters difficulties.Utilize the method for the present invention, it is not necessary to increase plus device method circuit, but changed by control circuit dynamic and measured
The earth point (reference point) of circuit, for example with a single-pole double-throw switch (SPDT) K3, control circuit is by controlling hilted broadsword double during charging
Throw switch K3 selects earth point (reference point) of the B points as measuring circuit, and the voltage arrived from the point of view of A is positive voltage, controls during electric discharge
For circuit by controlling the earth point (reference point) that single-pole double-throw switch (SPDT) K3 selects A points to be used as measuring circuit, what is arrived from the point of view of B is also just
Voltage.So, either charging process or discharge process, what measuring circuit was seen is all positive voltage, is easy to measure, and is implemented
Simply.
Fig. 5 is the dynamic measuring circuit structure chart for the bipolar signal that another embodiment of the present invention provides, as shown in figure 5,
Carry out reference point switching using the output of comparator, i.e., using comparator output signal, manually switching switch direction or
Automatically control single-pole double-throw switch (SPDT) switching.
Although the present invention is described in detail above, the invention is not restricted to this, those skilled in the art of the present technique
Various modifications can be carried out according to the principle of the present invention.Therefore, all modifications made according to the principle of the invention, all should be understood to
Fall into protection scope of the present invention.
Claims (10)
- A kind of 1. dynamic measurement method of bipolar signal, it is characterised in that including：The polarity of measured signal in circuit is detected；If the polarity for detecting measured signal is positive polarity, the first reference point is selected as measuring circuit reference point, and treat Signal is surveyed to measure；If the polarity for detecting measured signal is negative polarity, the second reference point is selected as measuring circuit reference point, and treat Signal is surveyed to measure.
- 2. according to the method for claim 1, it is characterised in that the polarity of the measured signal in circuit detects The step of include：According to the physical quantity variation of measured signal, the polarity of measured signal is detected.
- 3. according to the method for claim 1, it is characterised in that by controlling reference point switching circuit, select the first reference Point or the second reference point are as measuring circuit reference point.
- 4. according to the method for claim 3, it is characterised in that the reference point switching circuit includes single-pole double-throw switch (SPDT).
- 5. according to the method described in claim 1-4 any one, it is characterised in that the measured signal is the electric current of battery Signal, the current signal of the battery is acquired using with the current sensor that the battery is connected, and by described in One end of the remote battery terminal negative of current sensor is as the first reference point, by the current sensor described in One end of battery terminal negative is as the second reference point.
- A kind of 6. dynamic measurement device of bipolar signal, it is characterised in that including：Check up polarity module, for being detected to the polarity of the measured signal in circuit；Dynamic measurement module, if the polarity for detecting measured signal is positive polarity, the first reference point is selected as measuring circuit Reference point, and measure to measured signal, if the polarity for detecting measured signal is negative polarity, select the second reference point to make For measuring circuit reference point, and measure to measured signal.
- 7. device according to claim 6, it is characterised in that the Check up polarity module is according to the physical quantity of measured signal Change, detect the polarity of measured signal.
- 8. device according to claim 6, it is characterised in that the dynamic measurement module is by controlling reference point switching electricity Road, the first reference point or the second reference point are selected as measuring circuit reference point.
- 9. device according to claim 8, it is characterised in that the reference point switching circuit includes single-pole double-throw switch (SPDT).
- 10. according to the device described in claim 6-9 any one, it is characterised in that the measured signal is the electricity of battery Signal is flowed, the dynamic measurement module utilizes the current signal with the current sensor that the battery is connected to the battery It is acquired, and using one end of the remote battery terminal negative of the current sensor as the first reference point, by the electricity One end of the close battery terminal negative of flow sensor is as the second reference point.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610624817.5A CN107677876A (en) | 2016-08-02 | 2016-08-02 | The dynamic measurement method and device of a kind of bipolar signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610624817.5A CN107677876A (en) | 2016-08-02 | 2016-08-02 | The dynamic measurement method and device of a kind of bipolar signal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107677876A true CN107677876A (en) | 2018-02-09 |
Family
ID=61133439
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610624817.5A Withdrawn CN107677876A (en) | 2016-08-02 | 2016-08-02 | The dynamic measurement method and device of a kind of bipolar signal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107677876A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109347301A (en) * | 2018-11-06 | 2019-02-15 | 武汉领普科技有限公司 | A kind of self-powered method and apparatus |
| CN114280486A (en) * | 2021-12-30 | 2022-04-05 | 迪卡龙(青岛)电子有限公司 | Negative voltage battery tester and application method thereof |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1284775A (en) * | 1999-08-13 | 2001-02-21 | 杨泰和 | Automatic pole exchanging circuit with current detecting feedback function |
| CN1293351A (en) * | 1999-10-14 | 2001-05-02 | 丹福斯有限公司 | Emitter and receiver circuit suitable for ultrasonic wave flow measuring meter |
| CN1748150A (en) * | 2003-02-12 | 2006-03-15 | 皇家飞利浦电子股份有限公司 | Current monitoring system using bi-directional current sensor |
| CN101029920A (en) * | 2006-09-07 | 2007-09-05 | 长安大学 | System for inspecting operation parameter of central/distributed electric vehicle battery set |
| CN102460198A (en) * | 2009-06-24 | 2012-05-16 | 日本碍子株式会社 | Battery control apparatus and battery control method |
| CN104502679A (en) * | 2014-12-31 | 2015-04-08 | 广东易事特电源股份有限公司 | Bidirectional current detection circuit |
-
2016
- 2016-08-02 CN CN201610624817.5A patent/CN107677876A/en not_active Withdrawn
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1284775A (en) * | 1999-08-13 | 2001-02-21 | 杨泰和 | Automatic pole exchanging circuit with current detecting feedback function |
| CN1293351A (en) * | 1999-10-14 | 2001-05-02 | 丹福斯有限公司 | Emitter and receiver circuit suitable for ultrasonic wave flow measuring meter |
| CN1748150A (en) * | 2003-02-12 | 2006-03-15 | 皇家飞利浦电子股份有限公司 | Current monitoring system using bi-directional current sensor |
| CN101029920A (en) * | 2006-09-07 | 2007-09-05 | 长安大学 | System for inspecting operation parameter of central/distributed electric vehicle battery set |
| CN102460198A (en) * | 2009-06-24 | 2012-05-16 | 日本碍子株式会社 | Battery control apparatus and battery control method |
| CN104502679A (en) * | 2014-12-31 | 2015-04-08 | 广东易事特电源股份有限公司 | Bidirectional current detection circuit |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109347301A (en) * | 2018-11-06 | 2019-02-15 | 武汉领普科技有限公司 | A kind of self-powered method and apparatus |
| CN109347301B (en) * | 2018-11-06 | 2020-07-07 | 武汉领普科技有限公司 | Self-powered method and device |
| CN114280486A (en) * | 2021-12-30 | 2022-04-05 | 迪卡龙(青岛)电子有限公司 | Negative voltage battery tester and application method thereof |
| CN114280486B (en) * | 2021-12-30 | 2024-05-28 | 迪卡龙(青岛)电子有限公司 | Negative voltage battery tester and use method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105978106A (en) | Balanced charging circuit of serial batteries and apparatus thereof | |
| CN101828123A (en) | Method and device for measuring cell voltages in a plurality of series-connected accumulator cells | |
| CN203310920U (en) | Battery insulation detection circuit and battery insulation detection device | |
| CN205263278U (en) | Monomer internal resistance of battery and connecting wire resistance measurement device thereof | |
| CN106597063A (en) | Current detecting circuit and current detecting method | |
| CN103064025A (en) | Battery electric quantity detection method and device using the same | |
| CN108195465A (en) | A kind of detection device and method | |
| CN207571190U (en) | A kind of voltage ripple detection device | |
| CN102749980B (en) | It is the method and system of external USB equipment charge when USB main equipment is standby | |
| CN107677876A (en) | The dynamic measurement method and device of a kind of bipolar signal | |
| CN103138025B (en) | Electric leakage detection circuit and battery system | |
| CN208547706U (en) | A kind of rechargeable battery charging and discharging currents detection circuit and the electric appliance using rechargeable battery | |
| CN105826959A (en) | Charging method, device and mobile terminal | |
| CN207083253U (en) | A kind of adaptive fast response circuit and LED drive circuit | |
| CN201583636U (en) | Power lithium battery capacity detection circuit with multi-channel switching functions | |
| CN109149973A (en) | Constant current output control circuit and its design method | |
| CN204389654U (en) | Based on the battery electric quantity detection system that cell resistance is followed the tracks of | |
| CN207603241U (en) | Discharging device | |
| CN207336641U (en) | A kind of electric car high-voltage isulation detecting system | |
| CN211856709U (en) | Current detection circuit | |
| CN109633426A (en) | Switch detection method | |
| CN111965430B (en) | Impedance measurement method and device capable of realizing power supply of low-voltage lithium battery pack | |
| CN203929854U (en) | Voltage magnitude testing circuit | |
| CN209709702U (en) | A kind of charging control circuit, electronic equipment | |
| CN206431187U (en) | Current detection circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20180209 |