CN203881853U - Electric double-layer super capacitor capacitance measurement circuit - Google Patents
Electric double-layer super capacitor capacitance measurement circuit Download PDFInfo
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- CN203881853U CN203881853U CN201420210991.1U CN201420210991U CN203881853U CN 203881853 U CN203881853 U CN 203881853U CN 201420210991 U CN201420210991 U CN 201420210991U CN 203881853 U CN203881853 U CN 203881853U
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- capacitor
- voltage
- constant current
- switch
- electric double
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Abstract
The utility model relates to the technical field of capacitors and more specifically relates to an electric double-layer super capacitor capacitance measurement circuit. The electric double-layer super capacitor capacitance measurement circuit comprises a timer and comprises a first voltage comparator and a second voltage comparator which are connected with the timer. The circuit also comprises a constant current source, a constant current discharge circuit and a switch. The constant current source is respectively connected with the first voltage comparator and the second voltage comparator. One end of a capacitor to be measured is grounded, and 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 electric double-layer super capacitor capacitance measurement circuit has the advantages of simple connection and low cost and can be widely used in a large range. Further, a measurement method applied in the circuit is provided, and the steps of the measurement method are concise.
Description
Technical field
The utility model relates to the technical field of capacitor, more specifically, relates to a kind of electric double layer super capacitor cubic content measurement circuit.
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 utility model 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.
For solving the problems of the technologies described above, the technical solution adopted in the utility model 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 respectively with the first voltage comparator, second voltage comparer connects, testing capacitor one end ground connection, other end connecting valve, the A end of switch connects constant current source for testing capacitor is charged, 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 the utility model 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.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 utility model.
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 preferred implementation of the present utility model, should be understood that, for those skilled in the art, not departing under the prerequisite of the utility model principle, to the technical scheme of utility model, can do the improvement of some applicable actual conditions.Therefore, protection domain of the present utility model is not limited to this, and those of skill in the art are any to be included within the utility model protection domain based on non-material change in technical solutions of the utility model.
Claims (3)
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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420210991.1U CN203881853U (en) | 2014-04-28 | 2014-04-28 | Electric double-layer super capacitor capacitance measurement circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420210991.1U CN203881853U (en) | 2014-04-28 | 2014-04-28 | Electric double-layer super capacitor capacitance measurement circuit |
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| Publication Number | Publication Date |
|---|---|
| CN203881853U true CN203881853U (en) | 2014-10-15 |
Family
ID=51682338
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420210991.1U Expired - Fee Related CN203881853U (en) | 2014-04-28 | 2014-04-28 | Electric double-layer super capacitor capacitance measurement circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203881853U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105158581A (en) * | 2015-09-28 | 2015-12-16 | 国网甘肃省电力公司 | High-capacity capacitor capacity measurement circuit |
| CN109387701A (en) * | 2017-08-02 | 2019-02-26 | 台达电子工业股份有限公司 | Three-phase converter and capacitance estimation method |
-
2014
- 2014-04-28 CN CN201420210991.1U patent/CN203881853U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105158581A (en) * | 2015-09-28 | 2015-12-16 | 国网甘肃省电力公司 | High-capacity capacitor capacity measurement circuit |
| CN105158581B (en) * | 2015-09-28 | 2018-01-16 | 国网甘肃省电力公司 | Large bulk capacitance cubic content measurement circuit |
| CN109387701A (en) * | 2017-08-02 | 2019-02-26 | 台达电子工业股份有限公司 | Three-phase converter and capacitance estimation method |
| CN109387701B (en) * | 2017-08-02 | 2021-03-19 | 台达电子工业股份有限公司 | Three-phase converter device and capacitance estimation method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: ZHAOQING BERYL ELECTRONIC TECHNOLOGY CO., LTD. Free format text: FORMER NAME: ZHAOQING BERYL ELECTRONIC CO., LTD. |
|
| CP01 | Change in the name or title of a patent holder |
Address after: 526020, Zhaoqing District, Guangdong City, Duanzhou province Zhaoqing Avenue South, Duanzhou eight Road West, plant area 2 Patentee after: Zhaoqing Beryl Electronic Technology Co.,Ltd. Address before: 526020, Zhaoqing District, Guangdong City, Duanzhou province Zhaoqing Avenue South, Duanzhou eight Road West, plant area 2 Patentee before: ZHAOQING BERYL ELECTRONIC Co.,Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141015 |