CN102385009B - Measuring device for capacitance and method thereof - Google Patents
Measuring device for capacitance and method thereof Download PDFInfo
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- CN102385009B CN102385009B CN201010271977.9A CN201010271977A CN102385009B CN 102385009 B CN102385009 B CN 102385009B CN 201010271977 A CN201010271977 A CN 201010271977A CN 102385009 B CN102385009 B CN 102385009B
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- 238000012360 testing method Methods 0.000 claims description 63
- 238000005259 measurement Methods 0.000 claims description 25
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Abstract
The invention discloses a measuring device for capacitance, which is applied in charging power supplies and capacitors to be measured. The measuring device for capacitance comprises a microcontroller unit, an analog-digital converter, a charging end switch unit, a charging end resistor unit, a discharging end switch unit and a discharging end resistor unit. The microcontroller unit controls the charging end switch unit and the discharging end switch unit to charge and discharge for the capacitor to be measured. The analog-digital converter unit measures the voltage and time changes when the capacitor to be measured is charged and discharged so as to obtain the capacitance value of the capacitance to be measured.
Description
Technical field
The present invention, about a kind of measuring equipment and method thereof, refers in particular to a kind of electric capacitance measurement devices and methods therefor.
Background technology
The electronic component that electric capacity right and wrong are usually shown in; Nearly all electronic product all can use electric capacity; Therefore, Electronics Engineer, when design or correcting electronic circuit, always needs to know the capacitance of the electric capacity using on circuit board, could the work of design or correcting electronic circuit be carried out perfect.A good universal electric meter should have the function of the capacitance that measures electric capacity, and this is indispensable pith.
Yet the technology of the capacitance of current known measurement electric capacity need to expend the longer time conventionally; And but the capacitance that the measures electric capacity shorter technology that expends time in need to use such as somewhat complex design such as a plurality of sign-changing amplifiers, so and do not meet requirement cheaply.Therefore, capacitance and measurement circuit that how can rapid measuring electric capacity be simply uncomplicated, and real is current important topic.
Summary of the invention
Fundamental purpose of the present invention is to provide a kind of electric capacitance measurement device, the capacitance that the circuit structure of its use simply but can rapid measuring electric capacity.
Another fundamental purpose of the present invention is to provide a kind of electric capacitance measurement method, the capacitance that the circuit structure of its use simply but can rapid measuring electric capacity.
For achieving the above object, the invention provides a kind of electric capacitance measurement device, be applied to charge power supply and testing capacitance.This electric capacitance measurement device comprises micro controller unit; Analog-digital converter unit, this analog-digital converter unit is electrically connected to this micro controller unit and this testing capacitance; Charging end switch element, this charging end switch element is electrically connected to this micro controller unit and this charge power supply; Charging end resistance unit, this charging end resistance unit is electrically connected to this charging end switch element; Discharge end switch element, this discharge end switch element is electrically connected to this micro controller unit and this charging end resistance unit; And discharge end resistance unit, this discharge end resistance unit is electrically connected to this discharge end switch element, this charging end resistance unit, this analog-digital converter unit and this testing capacitance.This charging end switch element of this microprogrammed control unit control and this discharge end switch element are to this testing capacitance charging and electric discharge; Voltage and time when this testing capacitance charging of this analog-digital converter unit measuring and electric discharge change, and learn whereby the capacitance of this testing capacitance.
This device also comprises: programmable comparer, and this programmable comparer is electrically connected to described analog-digital converter unit, described discharge end resistance unit, described testing capacitance and described micro controller unit; And change-over switch, this change-over switch is electrically connected to this programmable comparer.
This device also comprises: capacitance terminal resistance unit, and this capacitance terminal resistance unit is electrically connected to described discharge end resistance unit, described programmable comparer and described testing capacitance; And display unit, this display unit is electrically connected to described micro controller unit.
This device also comprises internal storage location, and this internal storage location is electrically connected to described micro controller unit.
Described analog-digital converter unit is quick high resolving power analog-digital converter.
For achieving the above object, the present invention also provides a kind of electric capacitance measurement method, is applied to charge power supply and testing capacitance.This electric capacitance measurement method comprises: micro controller unit is set; Analog-digital converter unit is set, and this analog-digital converter unit is electrically connected to this micro controller unit and this testing capacitance; Charging end switch element is set, and this charging end switch element is electrically connected to this micro controller unit and this charge power supply; Charging end resistance unit is set, and this charging end resistance unit is electrically connected to this charging end switch element; Discharge end switch element is set, and this discharge end switch element is electrically connected to this micro controller unit and this charging end resistance unit; Discharge end resistance unit is set, and this discharge end resistance unit is electrically connected to this discharge end switch element, this charging end resistance unit, this analog-digital converter unit and this testing capacitance; This charging end switch element of this microprogrammed control unit control and this discharge end switch element are to charge to this testing capacitance; And voltage and time variation during the charging of this testing capacitance of this analog-digital converter unit measuring, learn whereby the capacitance of this testing capacitance.
The method also comprises: described in described microprogrammed control unit control, charging end switch element and described discharge end switch element are to discharge to described testing capacitance; And the voltage and time variation in testing capacitance when electric discharge described in described analog-digital converter unit measuring, learn whereby the capacitance of described testing capacitance.
The method also comprises: programmable comparer is set, and this programmable comparer is electrically connected to described analog-digital converter unit, described discharge end resistance unit, described testing capacitance and described micro controller unit; And change-over switch is set, this change-over switch is electrically connected to this programmable comparer.
The method also comprises: capacitance terminal resistance unit is set, and this capacitance terminal resistance unit is electrically connected to described discharge end resistance unit, described programmable comparer and described testing capacitance; And display unit is set, this display unit is electrically connected to described micro controller unit.
The method also comprises: internal storage location is set, and this internal storage location is electrically connected to described micro controller unit.
Compared with prior art, electric capacitance measurement device and method of the present invention, not only circuit structure is simple, and the time of measurement electric capacity is short.
Accompanying drawing explanation
Fig. 1 is electric capacitance measurement device block scheme of the present invention;
Fig. 2 is electric capacitance measurement method flow diagram of the present invention;
Fig. 3 is capacitor charge and discharge circuit figure;
Fig. 4 is another embodiment block scheme of electric capacitance measurement device of the present invention;
Fig. 5 is another embodiment process flow diagram of electric capacitance measurement method of the present invention.
Description of reference numerals
Charge power supply VDD testing capacitance Cx
Electric capacitance measurement device 10 micro controller units 12
Analog-digital converter unit 14 display units 16
Internal storage location 18 charging end switch element SW1
Discharge end switch element SW2 charging end resistance unit Rref
Discharge end resistance unit R1 capacitance terminal resistance unit R2
Step S02～S26 input pickup resistance R
Output capacitor C input voltage vin
Output voltage V out programmable comparer 20
Change-over switch 22 reference voltage Vref
Embodiment
Relevant the technology of the present invention content and detailed description, now coordinate accompanying drawing to be described as follows:
Please refer to Fig. 1, is electric capacitance measurement device block scheme of the present invention.Electric capacitance measurement device 10 of the present invention is for charge power supply VDD and testing capacitance Cx; This electric capacitance measurement device 10 comprises micro controller unit 12, analog-digital converter unit 14, display unit 16, internal storage location 18, charging end switch element SW1, discharge end switch element SW2, charging end resistance unit Rref, discharge end resistance unit R1 and capacitance terminal resistance unit R2.
This micro controller unit 12 is electrically connected to this analog-digital converter unit 14, this display unit 16, this internal storage location 18, this charging end switch element SW1 and this discharge end switch element SW2; This capacitance terminal resistance unit R2 is electrically connected to this analog-digital converter unit 14, this testing capacitance Cx and this discharge end resistance unit R1; This charging end switch element SW1 is more electrically connected to this charge power supply VDD and this charging end resistance unit Rref; This discharge end switch element SW2 is more electrically connected to this charging end resistance unit Rref and this discharge end resistance unit R1; This discharge end resistance unit R1 is more electrically connected to this charging end resistance unit Rref and this testing capacitance Cx.
This micro controller unit 12 controls this charging end switch element SW1 and this discharge end switch element SW2 charges and electric discharge to this testing capacitance Cx; Voltage and time when this analog-digital converter unit 14 measures this testing capacitance Cx charging and electric discharge change, and learn whereby the capacitance (being detailed later) of this testing capacitance Cx.This display unit 16 can be liquid crystal display (LCD); This internal storage location 18 can be electronics and can erase and can plan ROM (read-only memory) (EEPROM); This analog-digital converter unit 14 can be quick high resolving power analog-digital converter.
Another kind of the present invention is reached mode, be this discharge end switch element SW2 earth-free, but this charge power supply VDD has two kinds of power supplys; When charging, this charge power supply VDD exports positive voltage, and when electric discharge, this charge power supply VDD exports negative voltage.
Please refer to Fig. 2, is electric capacitance measurement method flow diagram of the present invention; And please also refer to Fig. 1.Electric capacitance measurement method of the present invention is applied to charge power supply VDD and testing capacitance Cx; This electric capacitance measurement method comprises the following step S02～S26:
Step S02: micro controller unit 12 is set;
Step S04: analog-digital converter unit 14 is set, and this analog-digital converter unit 14 is electrically connected to this micro controller unit 12 and this testing capacitance Cx;
Step S06: charging end switch element SW1 is set, and this charging end switch element SW1 is electrically connected to this micro controller unit 12 and this charge power supply VDD;
Step S08: charging end resistance unit Rref is set, and this charging end resistance unit Rref is electrically connected to this charging end switch element SW1;
Step S10: discharge end switch element SW2 is set, and this discharge end switch element SW2 is electrically connected to this micro controller unit 12 and this charging end resistance unit Rref;
Step S12: discharge end resistance unit R1 is set, and this discharge end resistance unit R1 is electrically connected to this discharge end switch element SW2, this charging end resistance unit Rref, this analog-digital converter unit 14 and this testing capacitance Cx;
Step S14: capacitance terminal resistance unit R2 is set, and this capacitance terminal resistance unit R2 is electrically connected to this discharge end resistance unit R1, this analog-digital converter unit 14 and this testing capacitance Cx;
Step S16: display unit 16 is set, and this display unit 16 is electrically connected to this micro controller unit 12;
Step S18: internal storage location 18 is set, and this internal storage location 18 is electrically connected to this micro controller unit 12;
Step S20: this micro controller unit 12 controls this charging end switch element SW1 and this discharge end switch element SW2 charges to this testing capacitance Cx;
Step S22: voltage and time when this analog-digital converter unit 14 measures this testing capacitance Cx charging change, and learn whereby the capacitance (being detailed later) of this testing capacitance Cx;
Step S24: this micro controller unit 12 controls this charging end switch element SW1 and this discharge end switch element SW2 discharges to this testing capacitance Cx;
Step S26: voltage and time when this analog-digital converter unit 14 measures this testing capacitance Cx electric discharge change, and learn whereby the capacitance (being detailed later) of this testing capacitance Cx.
Please refer to Fig. 3, is capacitor charge and discharge circuit figure.One end of input pickup resistance R is electrically connected to input voltage vin, and the other end of this input pickup resistance R is electrically connected to one end of output voltage V out and output capacitor C; The other end ground connection of this output capacitor C.
For convenience of explaining orally, element numbers will be only listed in following mathematical operation; Wherein, e is for especially drawing constant (Eulerconstant), and ln be take the logarithmic function that e is the truth of a matter.The relational expression of this output voltage V out and this input voltage vin, this input pickup resistance R and this output capacitor C is:
Vout＝Vin(1-e
-t/RC)
As follows through deriving:
Vout/Vin＝1-e
-t/RC
e
-t/RC＝1-(Vout/Vin)
lne
-t/RC＝ln[1-(Vout/Vin)]
-t/RC＝ln[1-(Vout/Vin)]
t＝-RC*ln[1-(Vout/Vin)]
l/C＝-R*ln[1-(Vout/Vin)]/t
C＝-t/{R*ln[1-(Vout/Vin)]}
Please refer again to Fig. 1, therefore:
Cx＝-Tchg/{(Rref+R1)*ln[1-(ΔV/VDD)]}
Wherein Tchg is the duration of charging, and Δ V is charged electrical pressure reduction.Similarly, during electric discharge be:
Tdisc＝-R1*Cx*ln[1-(V2/V1)]
So Cx=-Tdisc/{R1*ln[1-(V2/V1)] }
Wherein, Tdisc is discharge time, and V2 is the rear voltage of electric discharge, and V1 is voltage before discharging.During charging, this charging end switch element SW1 is electrically connected to this charging end resistance unit Rref by this charge power supply VDD, and SW2 is earth-free for this discharge end switch element; During electric discharge, this charging end switch element SW1 opens circuit this charge power supply VDD and this charging end resistance unit Rref incision, this discharge end switch element SW2 ground connection.
Please refer to Fig. 4, is another embodiment block scheme of electric capacitance measurement device of the present invention.Fig. 4 and Fig. 1 something in common repeat no more; How the difference of Fig. 4 and Fig. 1 has been a programmable comparer 20 and change-over switch 22.This programmable comparer 20 is electrically connected to this analog-digital converter unit 14, this capacitance terminal resistance unit R2, this micro controller unit 12 and this change-over switch 22; This change-over switch 22 is more electrically connected between reference voltage Vref and ground connection.
, derive similarly with aforementioned formula:
Cx＝-Tchg/{(Rref+R1)*ln[(VDD-VD)/(VDD-VC)]}
Wherein, VD represents charged voltage, the voltage before VC representative charging.
This change-over switch 22 can be controlled the variation that this programmable comparer 20 is set in different voltage level monitoring capacitance voltages; This micro controller unit 12 of these programmable comparer 20 real-time informings carries out gear shift and precisely cuts rapidly again correct gear; Because duration of charging and discharge time all can be monitored in real time, thereby measurement speed and efficiency can significantly promote, no matter capacitance size all can be measured easily.
Please refer to Fig. 5, is another embodiment process flow diagram of electric capacitance measurement method of the present invention; And please also refer to Fig. 4.Fig. 5 and Fig. 2 something in common repeat no more; The difference of Fig. 5 and Fig. 2 is to have increased between step S12 and step S14 step S13_1 and step S13_2:
Step S13_1: programmable comparer 20 is set, and this programmable comparer 20 is electrically connected to this analog-digital converter unit 14, this discharge end resistance unit R1, this testing capacitance Cx and this micro controller unit 12;
Step S13_2: change-over switch 22 is set, and this change-over switch 22 is electrically connected to this programmable comparer 20.
Not only circuit structure is simple for electric capacitance measurement device 10 of the present invention, and the time of measurement electric capacity is short; For example the capacitance of this testing capacitance Cx is 10000uF, and the resistance of this charging end resistance unit Rref and this discharge end resistance unit R1 and be 6.2K ohm only needs approximately 2 seconds can complete measurement.
Above are only preferred embodiment of the present invention, be not used for limiting scope of the invention process.Be that all equalizations of doing according to the claims in the present invention book change and modify, be the scope of the claims of the present invention and contain.
Claims (7)
1. an electric capacitance measurement device, is applied to charge power supply and testing capacitance, it is characterized in that, this electric capacitance measurement device comprises:
Micro controller unit;
Analog-digital converter unit, this analog-digital converter unit is electrically connected to this micro controller unit and this testing capacitance;
Charging end switch element, this charging end switch element is electrically connected to this micro controller unit and this charge power supply;
Charging end resistance unit, this charging end resistance unit is electrically connected to this charging end switch element;
Discharge end switch element, this discharge end switch element is electrically connected to this micro controller unit and this charging end resistance unit;
Discharge end resistance unit, this discharge end resistance unit is electrically connected to this discharge end switch element, this charging end resistance unit, this analog-digital converter unit and this testing capacitance;
Programmable comparer, this programmable comparer is electrically connected to described analog-digital converter unit, described discharge end resistance unit, described testing capacitance and described micro controller unit; And
Change-over switch, this change-over switch is electrically connected between this programmable comparer, reference voltage and ground connection, this change-over switch is controlled this programmable comparer and is set in different voltage levels to monitor the variation of this testing capacitance voltage, and this change-over switch comprises three resistance
Wherein, this charging end switch element of this microprogrammed control unit control and this discharge end switch element are to this testing capacitance charging and electric discharge; Voltage and time when this testing capacitance charging of this analog-digital converter unit measuring and electric discharge change, and learn whereby the capacitance of this testing capacitance;
Wherein, when this testing capacitance is recharged, this charging end switch element is electrically connected to this charging end resistance unit by this charge power supply, and this discharge end switch element is earth-free; When this testing capacitance is discharged, this charging end switch element opens circuit this charge power supply and this charging end resistance unit incision, this discharge end switch element ground connection.
2. electric capacitance measurement device as claimed in claim 1, is characterized in that, this device also comprises:
Capacitance terminal resistance unit, this capacitance terminal resistance unit is electrically connected to described discharge end resistance unit, described programmable comparer and described testing capacitance; And
Display unit, this display unit is electrically connected to described micro controller unit.
3. electric capacitance measurement device as claimed in claim 2, is characterized in that, this device also comprises internal storage location, and this internal storage location is electrically connected to described micro controller unit.
4. electric capacitance measurement device as claimed in claim 3, is characterized in that, described analog-digital converter unit is quick high resolving power analog-digital converter.
5. an electric capacitance measurement method, is applied to charge power supply and testing capacitance, it is characterized in that, this electric capacitance measurement method comprises:
A: micro controller unit is set;
B: analog-digital converter unit is set, and this analog-digital converter unit is electrically connected to this micro controller unit and this testing capacitance;
C: charging end switch element is set, and this charging end switch element is electrically connected to this micro controller unit and this charge power supply;
D: charging end resistance unit is set, and this charging end resistance unit is electrically connected to this charging end switch element;
E: discharge end switch element is set, and this discharge end switch element is electrically connected to this micro controller unit and this charging end resistance unit;
F: discharge end resistance unit is set, and this discharge end resistance unit is electrically connected to this discharge end switch element, this charging end resistance unit, this analog-digital converter unit and this testing capacitance;
F1: programmable comparer is set, and this programmable comparer is electrically connected to described analog-digital converter unit, described discharge end resistance unit, described testing capacitance and described micro controller unit;
F2: change-over switch is set, and this change-over switch is electrically connected between this programmable comparer, reference voltage and ground connection;
G: this charging end switch element of this microprogrammed control unit control and this discharge end switch element are to this testing capacitance charging;
H: voltage and time during this testing capacitance charging of this analog-digital converter unit measuring change, and learn whereby the capacitance of this testing capacitance;
I: described in described microprogrammed control unit control, charging end switch element and described discharge end switch element discharge to described testing capacitance; And
J: voltage and time when testing capacitance discharges described in described analog-digital converter unit measuring change, and learn whereby the capacitance of described testing capacitance,
Wherein, this change-over switch is controlled this programmable comparer and is set in different voltage levels to monitor the variation of this testing capacitance voltage, and this change-over switch comprises three resistance,
Wherein, when this testing capacitance is recharged, this charging end switch element is electrically connected to this charging end resistance unit by this charge power supply, and this discharge end switch element is earth-free; When this testing capacitance is discharged, this charging end switch element opens circuit this charge power supply and this charging end resistance unit incision, this discharge end switch element ground connection.
6. electric capacitance measurement method as claimed in claim 5, is characterized in that, the method also comprises after step f2:
F3: capacitance terminal resistance unit is set, and this capacitance terminal resistance unit is electrically connected to described discharge end resistance unit, described programmable comparer and described testing capacitance; And
F4: display unit is set, and this display unit is electrically connected to described micro controller unit.
7. electric capacitance measurement method as claimed in claim 6, is characterized in that, the method also comprises after step f4:
F5: internal storage location is set, and this internal storage location is electrically connected to described micro controller unit.
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| CN201010271977.9A CN102385009B (en) | 2010-09-01 | 2010-09-01 | Measuring device for capacitance and method thereof |
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| CN201010271977.9A CN102385009B (en) | 2010-09-01 | 2010-09-01 | Measuring device for capacitance and method thereof |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102636699A (en) * | 2012-03-29 | 2012-08-15 | 广州大学 | Capacitance measuring device |
| CN104251938A (en) * | 2013-06-27 | 2014-12-31 | 深圳市同洲电子股份有限公司 | Capacitor measurement circuit and system |
| CN105911373B (en) * | 2016-04-22 | 2019-01-29 | 上海市计量测试技术研究院 | A kind of method and device measuring supercapacitor static capacity |
| CN106093595A (en) * | 2016-08-29 | 2016-11-09 | 航宇救生装备有限公司 | Bulky capacitor assembly detects device discharge time |
| CN110879314A (en) * | 2019-12-12 | 2020-03-13 | 苏州市运泰利自动化设备有限公司 | Capacitance measuring method, capacitance measuring system, electronic device, and storage medium |
| CN113075459B (en) * | 2021-03-18 | 2023-02-03 | 合肥恒钧检测技术有限公司 | Electrostatic capacity detection device |
| CN115343515B (en) * | 2022-10-17 | 2023-03-07 | 基合半导体（宁波）有限公司 | Analog front end circuit, capacitance measuring circuit, chip and electronic equipment |
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| US6624640B2 (en) * | 2001-02-07 | 2003-09-23 | Fluke Corporation | Capacitance measurement |
| KR100828591B1 (en) * | 2006-12-14 | 2008-05-09 | 인하대학교 산학협력단 | Apparatus and method for measuring characteristic parameter of battery and computer readable medium storing program for measuring characteristic parameter of battery |
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| CN101672876A (en) * | 2008-09-12 | 2010-03-17 | 盛群半导体股份有限公司 | Circuit and method for measuring capacitance |
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| US6624640B2 (en) * | 2001-02-07 | 2003-09-23 | Fluke Corporation | Capacitance measurement |
| KR100828591B1 (en) * | 2006-12-14 | 2008-05-09 | 인하대학교 산학협력단 | Apparatus and method for measuring characteristic parameter of battery and computer readable medium storing program for measuring characteristic parameter of battery |
| CN101435838A (en) * | 2007-11-15 | 2009-05-20 | 鸿富锦精密工业（深圳）有限公司 | Apparatus for measuring capacitance capacity |
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