CN103941102A - Capacitance measurement circuit and method of electric double-layer super capacitor - Google Patents

Capacitance measurement circuit and method of electric double-layer super capacitor Download PDF

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Publication number
CN103941102A
CN103941102A CN201410173875.1A CN201410173875A CN103941102A CN 103941102 A CN103941102 A CN 103941102A CN 201410173875 A CN201410173875 A CN 201410173875A CN 103941102 A CN103941102 A CN 103941102A
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China
Prior art keywords
voltage
capacitor
switch
current source
testing capacitor
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CN201410173875.1A
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Chinese (zh)
Inventor
刘泳澎
马彦斌
赵振宇
罗伟
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ZHAOQING BERYL ELECTRONIC CO Ltd
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ZHAOQING BERYL ELECTRONIC CO Ltd
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Publication of CN103941102A publication Critical patent/CN103941102A/en
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Abstract

The invention relates to the technical field of capacitors, in particular to a capacitance measurement circuit and method of an electric double-layer super capacitor. The capacitance measurement circuit of the electric double-layer super capacitor comprises a timer, a first voltage comparator connected with the timer, a second voltage comparator, a constant current source, a constant-current discharge circuit and a switch. The constant current source is connected with the first voltage comparator and the second voltage comparator respectively, one end of the capacitor to be measured is connected to the ground, the other end of the capacitor to be measured is connected with the switch, the A end of the switch is connected with the constant current source and is used for charging the capacitor to be measured, and the B end of the switch is connected with the constant-current discharge circuit and is used for discharging the capacitor to be measured. The circuit is simple in connection, low in cost and wide in application range. The invention further provides the measurement method with the circuit utilized, and the measurement method is concise in step.

Description

A kind of electric double layer super capacitor cubic content measurement circuit and measuring method thereof
Technical field
The present invention relates to the technical field of capacitor, more specifically, relate to a kind of electric double layer super capacitor cubic content measurement circuit and measuring method thereof.
Background technology
Electric capacity is called in the common letter of capacitor, by letter C, represents.Definition 1: capacitor as its name suggests, is " filling electric container ", is a kind of device that holds electric charge.English name: capacitor.Electric capacity is one of a large amount of electronic components that use in electronic equipment, is widely used in handing over every straight-through in circuit, coupling, bypass, filtering, resonant tank, energy conversion, the aspects such as control.Definition 2: capacitor, any two insulated from each other and be separated by and between very near conductor (comprising wire), all form a capacitor.
But the circuit structure of existing measurement condenser capacity is complicated, its cost is higher, inconvenient widespread use.
Summary of the invention
The present invention is at least one defect overcoming described in above-mentioned prior art, and a kind of electric double layer super capacitor cubic content measurement circuit is provided, and its circuit connects simple, and cost is lower, widespread use on a large scale.Further, provide the measuring method of this circuit of application, its measuring method step is succinct.
For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of electric double layer super capacitor cubic content measurement circuit, wherein, comprise timer, the first voltage comparator being connected with timer, second voltage comparer, also comprise constant current source, constant-current discharge circuit, switch, constant current source is connected with the first voltage comparator, second voltage comparer respectively, testing capacitor one end ground connection, other end connecting valve, the A end connection constant current source of switch is for testing capacitor is charged, and the B end of switch connects constant-current discharge circuit and is used for capacitor discharge to be measured.
In this programme, the electric current syndeton of metering circuit is simple, and timer can accurate measurement time, and the threshold voltage of the first described voltage comparator is 0.9-1.0V.The threshold voltage of described second voltage comparer is the 92%-97% of testing capacitor rated insulation voltage value.Above-mentioned threshold voltage is set according to testing capacitor.
In this programme, constant-current charge method, the definition of root jade pendant capacitor, the electric weight Q of the capacity C of capacitor and its storage, and its current potential U, have into lower relation:
C=Q/U
Under normal conditions, capacitor is linear time invariant element, therefore to time diffusion:
C=dQ/dt/dU/dt
According to the definition of electric current: I=dQ/dt, above formula becomes:
C=I/?du/dt
=I/[(U 2-U 1)/(t 2?–t 1)
Ideal capacitor is carried out to constant current and fill (putting) electricity, voltage and time on it are linear, as long as measure U1, U2, T1, T2 just can obtain the capacity C of testing capacitor, to double layer capacitor, leakage current is almost equal to zero, though there is internal resistance, but without impact, because calculate what use, be all changing value on test.Before survey formula, testing capacitor is fully discharged until its both end voltage is zero, recharge, with oscillograph recording charge switch, connect, until the voltage on testing capacitor is to threshold voltage, then the overall process of cut-off switch.
Measuring method according to described electric double layer super capacitor cubic content measurement circuit, wherein, comprises the following steps,
S1. by testing capacitor electric discharge, the voltage that makes testing capacitor two ends is 0;
S2. the charging current of setting constant current source is I, then the threshold voltage of setting respectively the first voltage comparator, second voltage comparer is V1, V2;
S3. by timer zero clearing;
S4. switch is closed, and the A end of switch connects constant current source, starts charging;
S5. when the voltage of testing capacitor reaches respectively threshold voltage V1, the V2 of the first voltage comparator and second voltage comparer, the corresponding time T 1 of timer record, T2;
S6. obtain data I, V1, V2, T1, the T2 of measuring process record, can be calculated testing capacitor capacity and be C=I* (T2-T1)/(V2-V1).
After described step S5, change testing capacitor, be loaded on another testing capacitor, then repeat step S3-step S5.After described step S5, measure completely, after deenergization, carry out again step S6.The output steady current of described constant current source is 0.01400 ± 0.00001A.
Compared with prior art, beneficial effect is: the A end connection constant current source of switch of the present invention is for testing capacitor is charged, and the B end of switch connects constant-current discharge circuit and is used for capacitor discharge to be measured.Its circuit connects simple, and cost is lower, widespread use on a large scale.Further, provide the measuring method of this circuit of application, its measuring method step is succinct.
Accompanying drawing explanation
Fig. 1 is circuit connection diagram of the present invention.
Embodiment
Accompanying drawing, only for exemplary illustration, can not be interpreted as the restriction to this patent; For better explanation the present embodiment, some parts of accompanying drawing have omission, zoom in or out, and do not represent the size of actual product; To those skilled in the art, in accompanying drawing some known configurations and explanation thereof may to omit be understandable.
As shown in Figure 1, a kind of electric double layer super capacitor cubic content measurement circuit, wherein, comprise timer 1, the first voltage comparator 2, the second voltage comparer 3 that are connected with timer 1, also comprise constant current source 4, constant-current discharge circuit 5, switch 6, constant current source 4 is connected with the first voltage comparator 2, second voltage comparer 3 respectively, testing capacitor 7 one end ground connection, other end connecting valve 6, the A of switch 6 holds and connects constant current source 4 for testing capacitor 7 is charged, and the B end of switch 6 connects constant-current discharge circuit 5 for testing capacitor 7 is discharged.
In the present embodiment, the electric current syndeton of metering circuit is simple, and timer can 1 accurate measurement time, and the threshold voltage of the first described voltage comparator 2 is 0.9-1.0V.The threshold voltage of described second voltage comparer 3 is the 92%-97% of testing capacitor 7 rated insulation voltage values.Above-mentioned threshold voltage is set according to testing capacitor 7.
Measuring method according to described electric double layer super capacitor cubic content measurement circuit, wherein, comprises the following steps,
S1. by testing capacitor 7 electric discharges, the voltage that makes testing capacitor 7 two ends is 0;
S2. the charging current of setting constant current source 4 is I, then the threshold voltage of setting respectively the first voltage comparator 2, second voltage comparer 3 is V1, V2;
S3. by timer 1 zero clearing;
S4. switch 6 closures, the A end of switch 6 connects constant current source 4, starts charging;
S5. when the voltage of testing capacitor 7 reaches respectively threshold voltage V1, the V2 of the first voltage comparator 2 and second voltage comparer 3, timer 1 records corresponding time T 1, T2;
S6. obtain data I, V1, V2, T1, the T2 of measuring process record, can be calculated testing capacitor 7 capacity and be C=I* (T2-T1)/(V2-V1).
After described step S5, change testing capacitor 7, be loaded on another testing capacitor 7, then repeat step S3-step S5.After described step S5, measure completely, after deenergization, carry out again step S6.The output steady current of described constant current source is 0.01400 ± 0.00001A.
Concrete, to A sample, its charging process voltage is as follows over time:
The output steady current of constant current source 4 is 0.01400 ± 0.00001A.
Test for the first time: Δ U=2.74V, Δ t=60.00s
C=I/[(U 2-U 1)/(t 2?–t 1)=I/ΔU/Δt=IXΔt/ΔU
=14.00X10 -3X60.00/2.74
=306.57?X10 -3(F)
Test for the second time: Δ t=62.00s, Δ U=2.82V
C=I/[(U 2-U 1)/(t 2?–t 1)=I/ΔU/Δt=IXΔt/ΔU
=14.00X10 -3X62.00/2.82
=307.80?X10 -3?(F)
Test for the third time: Δ t=67.20s, Δ U=2.94V
C=I/[(U 2-U 1)/(t 2?–t 1)=I/ΔU/Δt=IXΔt/ΔU
=14.00X10 -3X67.20/2.94
=320.00?X10 -3?(F)
C mean value: (320.00+307.80+306.57)=311.46 X10 -3(F)
A sample capacity: 320.00 ± 7.42X10 -3(F)
To B sample, its charging process voltage is as follows over time:
Test for the first time: Δ t=68.40s, Δ U=2.82V
C=I/[(U 2-U 1)/(t 2?–t 1)=I/ΔU/Δt=IXΔt/ΔU
=14.00X10 -3X68.40/2.82
=339.57?X10 -3?(F)
Test for the second time: Δ U=2.80V, Δ t=64.40s
C=I/[(U 2-U 1)/(t 2?–t 1)=I/ΔU/Δt=IXΔt/ΔU
=14.00X10 -3X64.40/2.80
=322.00?X10 -3?(F)
Test for the third time: Δ U=3.04V, Δ t=69.00s
C==I/[(U 2-U 1)/(t 2?–t 1)=I/ΔU/Δt=IXΔt/ΔU
=14.00X10 -3X69.00/3.04
=317.76?X10 -3?(F)
C mean value: (317.76+322.00+339.57) X10 -3=326.44X10 -3(F)
B sample capacity: (326.44 ± 11.56) X10 -3(F)
To C sample, its charging process voltage is as follows over time:
Test for the first time: Δ t=68.40s, Δ U=3.10V
C=I/[(U 2-U 1)/(t 2?–t 1)=I/ΔU/Δt=IXΔt/ΔU
=14.00X10 -3X68.40/3.10
=308.90?X10 -3?(F)
Test for the second time: Δ U=3.08V, Δ t=66.00s
C=I/[(U 2-U 1)/(t 2?–t 1)=I/ΔU/Δt=IXΔt/ΔU
=14.00X10 -3X66.00/3.08
=300.00?X10 -3?(F)
Test for the third time: Δ t=61.80s, Δ U=2.94V
C==I/[(U 2-U 1)/(t 2?–t 1)=I/ΔU/Δt=IXΔt/ΔU
=14.00X10 -3X61.80/2.94
=294.29?X10 -3?(F)
C mean value: (294.29+300.00+308.90)=301.11 X10 -3(F)
C sample capacity: (301.11 ± 6.01) X10 -3(F)
To D sample, its charging process voltage is as follows over time:
Test for the first time: Δ t=63.20s, Δ U=2.64V
C=I/[(U 2-U 1)/(t 2?–t 1)=I/ΔU/Δt=IXΔt/ΔU
=14.00X10 -3X63.20/2.64
=335.15?X10 -3?(F)
Test for the second time: Δ U=2.58V, Δ t=61.20s
C=I/[(U 2-U 1)/(t 2?–t 1)=I/ΔU/Δt=IXΔt/ΔU
=14.00X10 -3X61.20/2.58
=332.15?X10 -3?(F)
Test for the third time: Δ U=2.86V, Δ t=68.60s
C=I/[(U 2-U 1)/(t 2?–t 1)=I/ΔU/Δt=IXΔt/ΔU
=14.00X10 -3X68.60/2.86
=335.80?X10 -3?(F)
C mean value: (335.80+332.15+335.15)=334.37 X10 -3(F)
D sample capacity: (334.37 ± 3.79) X10 -3(F)
To E sample, its charging process voltage is as follows over time:
Test for the first time: Δ t=61.60s, Δ U=2.86V
C=I/[(U 2-U 1)/(t 2?–t 1)=I/ΔU/Δt=IXΔt/ΔU
=14.00X10 -3X61.60/2.86
=301.54?X10 -3?(F)
Test for the second time: Δ U=2.90V, Δ t=62.00s
C=I/[(U 2-U 1)/(t 2?–t 1)=I/ΔU/Δt=IXΔt/ΔU
=14.00X10 -3X62.00/2.90
=299.31?X10 -3?(F)
Test for the third time: Δ U=2.96V, Δ t=63.20s
C=I/[(U 2-U 1)/(t 2?–t 1)=I/ΔU/Δt=IXΔt/ΔU
=14.00X10 -3X63.20/2.96
=298.92?X10 -3?(F)
C mean value: (298.92+299.31+301.54)=299.92 X10 -3(F)
E sample capacity: (299.92 ± 1.35) X10 -3(F)
To F sample
This sample cannot charge by the electric current of 14mA, therefore not test.
The corresponding same or analogous parts of same or analogous label; In accompanying drawing, describe position relationship only for exemplary illustration, can not be interpreted as the restriction to this patent.
The above is only the preferred embodiment of the present invention, it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention, can do the improvement of some applicable actual conditions to the technical scheme of invention.Therefore, protection scope of the present invention is not limited to this, and those of skill in the art are any to be included within protection domain of the present invention based on non-material change in technical solution of the present invention.

Claims (7)

1. an electric double layer super capacitor cubic content measurement circuit, it is characterized in that, comprise timer (1), the first voltage comparator (2) being connected with timer (1), second voltage comparer (3), also comprise constant current source (4), constant-current discharge circuit (5), switch (6), constant current source (4) respectively with the first voltage comparator (2), second voltage comparer (3) connects, testing capacitor (7) one end ground connection, other end connecting valve (6), the A end of switch (6) connects constant current source (4) for testing capacitor (7) is charged, the B end of switch (6) connects constant-current discharge circuit (5) for testing capacitor (7) is discharged.
2. a kind of electric double layer super capacitor cubic content measurement circuit according to claim 1, is characterized in that: the threshold voltage of described the first voltage comparator (2) is 0.9-1.0V.
3. a kind of electric double layer super capacitor cubic content measurement circuit according to claim 2, is characterized in that: the threshold voltage of described second voltage comparer (3) is the 92%-97% of testing capacitor (7) rated insulation voltage value.
4. the measuring method of electric double layer super capacitor cubic content measurement circuit according to claim 3, is characterized in that, comprise the following steps,
S1. by testing capacitor (7) electric discharge, making the voltage at testing capacitor (7) two ends is 0;
S2. the charging current of setting constant current source (4) is I, then the threshold voltage of setting respectively the first voltage comparator (2), second voltage comparer (3) is V1, V2;
S3. by timer (1) zero clearing;
S4. switch (6) closure, the A end of switch (6) connects constant current source (4), starts charging;
S5. when the voltage of testing capacitor (7) reaches respectively threshold voltage V1, the V2 of the first voltage comparator (2) and second voltage comparer (3), timer (1) records corresponding time T 1, T2;
S6. obtain data I, V1, V2, T1, the T2 of measuring process record, can be calculated testing capacitor (7) capacity and be C=I* (T2-T1)/(V2-V1).
5. measuring method according to claim 4, is characterized in that: after described step S5, change testing capacitor (7), be loaded on another testing capacitor (7), then repeat step S3-step S5.
6. measuring method according to claim 4, is characterized in that: after described step S5, measure completely, carry out step S6 after deenergization again.
7. measuring method according to claim 4, is characterized in that: the output steady current of described constant current source (4) is 0.01400 ± 0.00001A.
CN201410173875.1A 2014-04-28 2014-04-28 Capacitance measurement circuit and method of electric double-layer super capacitor Pending CN103941102A (en)

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Application Number Priority Date Filing Date Title
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109856461A (en) * 2019-01-22 2019-06-07 湖北三江航天红林探控有限公司 A kind of capacitance test circuit

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1651924A (en) * 2001-02-07 2005-08-10 弗兰克公司 Capacitor capacitance measurement apparatus
CN101082644A (en) * 2007-01-30 2007-12-05 王悦 Method for mirror-image constant flow source measuring capacitance
CN201527734U (en) * 2009-11-16 2010-07-14 杨景芝 Multifunctional device for demonstrating charge-discharge regulation of capacitor
CN102072989A (en) * 2010-11-03 2011-05-25 北京普源精电科技有限公司 Measurement device with function of measuring capacitance
CN202453426U (en) * 2011-12-05 2012-09-26 广州周立功单片机科技有限公司 Capacitance measuring device based on constant-current charge and discharge method of biased capacitor
CN103180744A (en) * 2012-10-17 2013-06-26 华为技术有限公司 Method, apparatus and circuit for detecting super capacitor
CN103176053A (en) * 2011-12-23 2013-06-26 鸿富锦精密工业(深圳)有限公司 Measuring circuit for capacity and parasitic resistance of capacitor

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1651924A (en) * 2001-02-07 2005-08-10 弗兰克公司 Capacitor capacitance measurement apparatus
CN101082644A (en) * 2007-01-30 2007-12-05 王悦 Method for mirror-image constant flow source measuring capacitance
CN201527734U (en) * 2009-11-16 2010-07-14 杨景芝 Multifunctional device for demonstrating charge-discharge regulation of capacitor
CN102072989A (en) * 2010-11-03 2011-05-25 北京普源精电科技有限公司 Measurement device with function of measuring capacitance
CN202453426U (en) * 2011-12-05 2012-09-26 广州周立功单片机科技有限公司 Capacitance measuring device based on constant-current charge and discharge method of biased capacitor
CN103176053A (en) * 2011-12-23 2013-06-26 鸿富锦精密工业(深圳)有限公司 Measuring circuit for capacity and parasitic resistance of capacitor
CN103180744A (en) * 2012-10-17 2013-06-26 华为技术有限公司 Method, apparatus and circuit for detecting super capacitor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109856461A (en) * 2019-01-22 2019-06-07 湖北三江航天红林探控有限公司 A kind of capacitance test circuit

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