CN112345834A - Method and device for measuring capacitance of capacitor - Google Patents
Method and device for measuring capacitance of capacitor Download PDFInfo
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- CN112345834A CN112345834A CN202011191290.4A CN202011191290A CN112345834A CN 112345834 A CN112345834 A CN 112345834A CN 202011191290 A CN202011191290 A CN 202011191290A CN 112345834 A CN112345834 A CN 112345834A
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
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Abstract
The invention discloses a device and a method for measuring capacitance of a capacitor, wherein the device part comprises a first loop for discharging the capacitor to be measured, a second loop for charging a standard capacitor and the capacitor to be measured and recording charging voltage, a third loop for transferring electric quantity of the standard capacitor and the capacitor to be measured and recording voltage after transferring, and a switch combination for switching the whole circuit among a first loop working state, a second loop working state and a third loop working state. Mainly solve among the prior art electric capacity measurement scheme and realize that the complexity is high, with high costs to and maintain troublesome problem, further still solved scheme itself and controlled convenience scheduling problem.
Description
Technical Field
The invention relates to the field of production and maintenance of electronic products, in particular to a device and a method for measuring capacitance of a capacitor.
Background
In the production and maintenance of electronic products, the capacitance measurement link is very important. A good electronic product should have an experimental life of a certain age. Therefore, in the production process, the key point for detecting that the electronic product meets the factory requirements is to detect an internal core circuit, and the capacitor has an irreplaceable function in the electronic product. Similarly, in the maintenance process of the electronic product by the maintenance personnel, the detection of the circuit is the most basic, and sometimes it is necessary to detect whether each component in the circuit is working normally, and the capacitance value of the capacitor is one of the items.
There are two common methods for measuring capacitance. Firstly, utilize multivibrator to produce pulse width and capacitance value direct ratio signal, through measuring output voltage behind the low pass filter and realize, this scheme hardware design is simple but the software realizes relatively complicacy. Secondly, a monostable trigger device is used for generating a gate pulse which is in direct proportion to the capacitance value to control the on-off of a standard counting pulse passing through a counter, namely the capacitance value is directly judged according to the charging and discharging time. The capacitance measuring scheme in the prior art has the problems of high system complexity, high cost and troublesome maintenance.
Disclosure of Invention
The invention provides a device for measuring capacitance of a capacitor, which mainly solves the technical problems that: the problems of high complexity, high cost and troublesome maintenance of the capacitance measurement scheme in the prior art are solved, and the problems of convenience and the like of the scheme per se in operation and control are further solved. The technical scheme is as follows:
the circuit comprises a first loop for discharging a capacitor to be detected, a second loop for charging a standard capacitor and the capacitor to be detected and recording charging voltage, a third loop for transferring electric quantity of the standard capacitor and the capacitor to be detected and recording voltage after transferring, and a switch combination for switching the whole circuit among a first loop working state, a second loop working state and a third loop working state.
When the capacitor to be tested is arranged in the device, the whole circuit sequentially works in a first loop working state, a second loop working state and a third loop working state through the switch combination, and the pins of the capacitor to be tested and the standard capacitor are connected reversely when the third loop works so that the electric quantity is transferred between the standard capacitor and the capacitor to be tested. Recording the charging voltage E in the working process of the second loop, recording the voltage U after the working state of the third loop is finished, and then calculating the capacitance value to be measured by using the following formula according to the standard capacitance value C when the measurement is finished:
the device further comprises a power supply, a voltmeter, a standard capacitor, a capacitor to be tested and a third electronic switch which are connected in parallel with the power supply, a first electronic switch which is connected in series between the power supply and a branch formed by the voltmeter, the standard capacitor, the capacitor to be tested and the third electronic switch, and a second electronic switch which is connected in series between a branch formed by the power supply, the voltmeter and the standard capacitor and a branch formed by the capacitor to be tested and the third electronic switch;
the switching mode of the working state of each loop is as follows:
when the first electronic switch is turned off, the second electronic switch is turned off, and the third electronic switch is turned on, the whole circuit is in a first loop working state, wherein the capacitor to be tested and the third electronic switch form the first loop; when the third electronic switch is switched off and the first electronic switch and the second electronic switch are switched on, the whole circuit is in a second loop working state, and the power supply, the voltmeter, the capacitor to be tested, the standard capacitor, the first electronic switch and the second electronic switch form the second loop; when the first electronic switch and the third electronic switch are disconnected, the two ends of the capacitor to be tested are reversely connected into the whole circuit, and the second electronic switch is closed, so that the whole circuit is in a third loop working state, and the voltmeter, the capacitor to be tested, the standard capacitor and the second electronic switch form the third loop.
This technical scheme is first return circuit, the second return circuit on basis, third return circuit implementation scheme, two pins of the electric capacity that will await measuring are reverse to be connected and are inserted the whole circuit when using switch combination to switch second return circuit and third return circuit operating condition, can be with two pin reverse connections of standard electric capacity access whole circuit equally, but it is usually not very convenient that the whole circuit is arranged the pin that changes standard electric capacity in the shell in and is reversed, the reverse two pins of the electric capacity that awaits measuring of preferred adoption, this scheme need not realize through devices such as extra software and electronic trigger, the succinct reliability of whole scheme, reduce whole complexity, cost effectively reduces, it is convenient to maintain, long service life.
The device comprises a power supply, a voltmeter, a standard capacitor and a linkage single-pole double-throw switch, wherein the voltmeter and the standard capacitor are connected in parallel on the power supply, two ends of a branch formed by the voltmeter and the standard capacitor are further connected with the linkage single-pole double-throw switch, when the linkage single-pole double-throw switch is in a first switch state, the capacitor to be tested is connected with a third electronic switch in parallel and then is connected with the linkage single-pole double-throw switch in series, and when the linkage single-pole double-throw switch is in a second switch state, two ends of the capacitor to be tested are connected with the standard capacitor in parallel.
The working state of each loop is switched in the way of：When the linkage single-pole double-throw switch is in an idle state and the third electronic switch is closed, the whole circuit is in a first loop working state, wherein the capacitor to be tested and the third electronic switch form the first loop; when the third electronic switch is switched off, the linkage single-pole double-throw switch is in a first switch state, and the first electronic switch is switched on, the whole circuit is in a second loop working state, wherein the power supply, the voltmeter, the capacitor to be tested, the standard capacitor and the first electronic switch form the second loop; when the first electronic switch is switched off, the third electronic switch is switched off, and the linkage single-pole double-throw switch is in the second switch state, the whole circuit is in a third loop working state, wherein the voltmeter, the capacitor to be tested and the standard capacitor form the third loop.
The step of manually carrying out reverse access circuit to the capacitance both ends that await measuring has further been removed to this scheme, the state of change over switch combination can, the circumstances such as electric quantity loss that have avoided manual reverse access probably to bring, convenient measurement on the one hand, on the other hand has avoided by manual extra loss of precision that brings with the reverse access of electric capacity.
The device further comprises a power supply, a capacitance meter and a standard capacitor which are connected in parallel with the power supply, wherein two ends of a branch formed by the capacitance meter and the standard capacitor are also connected with a linked switch;
the switching mode of the working state of each loop is as follows:
when the first electronic switch is switched off, the linkage switch is in any state, and the third electronic switch is switched on, the whole circuit is in a first loop working state, wherein the capacitor to be tested and the third electronic switch form the first loop; when the third electronic switch is switched off, the linkage switch is in a first switch state, and the first electronic switch is switched on, the whole circuit is in a second loop working state, wherein the power supply, the capacitance meter, the capacitor to be measured, the standard capacitor and the first electronic switch form the second loop, and at the moment, the capacitance meter records the measured voltage E; when the first electronic switch is switched off, the third electronic switch is switched off, and the linkage switch is in a second switch state, the whole circuit is in a third loop working state, wherein the capacitance meter, the capacitor to be measured and the standard capacitor form the third loop, and at the moment, the capacitance meter records the measured voltage U; when the measurement is finished, according to the standard capacitance value C, the capacitance meter displays the measured capacitance value according to the following formula:
the capacitance value to be measured is further directly displayed by the technical scheme, the steps of manual calculation are reduced, the use by an operator is facilitated, and the whole usability of the device is enhanced.
The device further comprises a power supply and a standard capacitor connected to the power supply in parallel, wherein a first electronic switch is connected between the power supply and the standard capacitor in series, linkage switches are also connected to two ends of the standard capacitor in series, when the linkage switches are in a first switch state, a capacitor to be tested is connected with a third electronic switch in series after being connected in parallel, and when the linkage switches are in a second switch state, two ends of the capacitor to be tested are connected with the standard capacitor in parallel after being reversed; the switch state of the first electronic switch, the second electronic switch and the third electronic switch is controlled by a control chip, the common connection point of the first electronic switch, the linkage switch and the standard capacitor is a voltage sampling point, the voltage sampling point is connected to the control chip and used for voltage sampling, the control chip is further connected with a display screen, and the control chip is further connected with a start key.
The switching mode of the working state of each loop is as follows:
when the control chip outputs a control signal, the first electronic switch is switched off, the linkage switch is in any state, and the third electronic switch is switched on, the whole circuit is in a first loop working state, wherein the capacitor to be tested and the third electronic switch form the first loop; when the control chip outputs a control signal, the third electronic switch is switched off, the linkage switch is in a first switch state, and the first electronic switch is switched on, the whole circuit is in a second loop working state, wherein the power supply, the capacitor to be tested, the standard capacitor and the first electronic switch form the second loop, and at the moment, the voltage value measured by the control chip from the voltage sampling point is E; when the control chip outputs a control signal, the first electronic switch is switched off, the third electronic switch is switched off, and the linkage switch is in a second switch state, the whole circuit is in a third loop working state, wherein the capacitor to be tested and the standard capacitor form the third loop, and at the moment, the voltage value measured by the control chip from the voltage sampling point is U;
the switching mode of each loop is automatic switching, and the automatic switching mode is that after a start key is pressed, the control chip switches the electronic switches and the voltage sampling points according to the switching mode of the working state of each loop, wherein the time of the whole loop in the first loop working state is set as the first working time by the control chip, the time in the second loop working state is set as the second working time by the control chip, the time in the third loop working state is set as the third working time by the control chip, typical values of the first working time, the second working time and the third working time are respectively 10s, 10s and 10s, the control chip marks that the measurement is finished after the first working time, the second working time and the third working time are finished, according to the standard capacitance value C, the control chip outputs the result of the capacitance value to be measured to a display screen for displaying after calculating according to the following formula:
the technical scheme is a fourth implementation scheme, can control the measurement of the capacitor through one key of the starting key, and automatically outputs the result after the measurement is completed, so that the device is easy to use integrally, relatively complicated steps of switching the working circuit are avoided, the misoperation rate is reduced, and the detection efficiency is improved.
Furthermore, the device also comprises a shell used for loading the whole circuit except the part of the capacitor to be tested, and the capacitor to be tested is connected into the circuit through a meter pen or a conductive clamp. The capacitance to be measured is clamped by the meter pen and the conductive clamp to be measured, and the measurement is more convenient and reliable compared with a direct wire access circuit.
Furthermore, the state switching of the electronic switch is performed through a gear switch, when the gear switch is switched to a first gear, the whole circuit is in a first loop working state, when the gear switch is switched to a second gear, the whole circuit is in a second loop working state, and when the gear switch is switched to a third gear, the whole circuit is in a third loop working state. The gear switch control switch combination is adopted to switch the working state of the whole circuit more easily than the single switch combination state, so that the situation of measurement errors caused by misoperation of operators or unfamiliarity is reduced.
The invention also provides a method for measuring the capacitance of the capacitor, which adopts the technical scheme that: the method comprises the steps of S1 discharging a capacitor to be measured, S2 charging a standard capacitor and the capacitor to be measured and recording charging voltage, and S3 transferring electric quantity of the standard capacitor and the capacitor to be measured and recording voltage after transferring, wherein switching among the steps of S1, S2 and S3 is realized by switching the state of a switch combination. The scheme is not required to be realized through devices such as additional software and an electronic trigger, the whole scheme is simple and reliable, the whole complexity is reduced, the cost is effectively reduced, the maintenance is convenient and fast, and the service life is long.
The state change of the range switch is used to control the state of the switch combination to control the switching among the steps S1, S2 and S3. The gear switch control switch combination is adopted to switch the working state of the whole circuit more easily than the single switch combination state, so that the situation of measurement errors caused by misoperation of operators or unfamiliarity is reduced.
And the capacitor to be tested is connected into the circuit by clamping the capacitor pin through the conductive clamp. Aiming at the characteristics of capacitance pin measurement, the conductive clamp is adopted to clamp the capacitance pin to be measured for measurement, so that the measurement process is switched to the connection of the capacitance pin to be measured, different capacitances to be measured are switched, the connection stability and the pin connection area during measurement are kept, and the measurement process is more convenient and reliable.
For equivalent circuit combinations or splits of the solutions described in the description, such as a battery in series instead of a battery, two switches in series instead of one switch, should not be excluded from the scope of protection of the present invention.
Drawings
FIG. 1 is a circuit diagram of an embodiment 1 of an apparatus for measuring capacitance of a capacitor provided by the present invention;
FIG. 2 is a circuit diagram of an embodiment 2 of an apparatus for measuring capacitance of a capacitor provided by the present invention;
FIG. 3 is a circuit diagram of an embodiment 3 of an apparatus for measuring capacitance of a capacitor provided by the present invention;
FIG. 4 is a schematic diagram of a shift control switching circuit of the apparatus for measuring capacitor capacitance provided by the present invention;
FIG. 5 is a circuit diagram of an embodiment 4 of an apparatus for measuring capacitance of a capacitor provided by the present invention;
description of reference numerals:
1. the device comprises a power supply, 2, a first electronic switch, 3, a second electronic switch, 4, a third electronic switch, 5, a capacitor to be tested, 6, a standard capacitor, 7, a voltmeter, 8, a linkage single-pole double-throw switch, 9, a capacitance meter, 10, a linkage switch, 11, a starting key, 12 and a voltage sampling point.
Detailed Description
Three specific embodiments of the present invention will be described in detail below with reference to the drawings, but it should be understood that the scope of the present invention is not limited to the specific embodiments.
Example one
Referring to fig. 1, which is a schematic diagram of an apparatus for measuring capacitance of a capacitor according to the present invention, first, a third electronic switch SW3(4) is pressed to discharge a capacitor Cx (5) to be measured, and then an electronic button switch SW3(4) is released.
Simultaneously, a first electronic switch SW1(2) and a second electronic switch SW2(3) are pressed down to charge a standard capacitor C (6) and a capacitor Cx (5) to be tested, and the number indicated by a voltmeter (7) is marked as E, so that the method comprises the following steps: qc ═ EC, Qcx ═ ECx.
When the first electronic switch SW1(2) and the second electronic switch SW2(3) are released, the two pins A, B of the capacitor Cx (5) to be tested are exchanged, and the second electronic switch SW2(3) is pressed, the indication number of the voltmeter (7) is marked as U, then: Qc-Qcx-UC ═ UCx,
simplifying:
wherein, C is the capacitance value of the standard capacitor, and E, U is the capacitance value measured in the above measurement process, then the capacitance value Cx to be measured can be calculated.
Example two
Referring to fig. 2, which is a circuit diagram of an embodiment 2 of the apparatus for measuring capacitance of a capacitor according to the present invention, first, the third electronic switch SW3(4) is pressed to discharge the capacitor Cx (5) to be measured, and the third electronic switch SW3(4) is released.
Then, the linkage single-pole double-throw switch SW7(8) is turned to the upper end, the first electronic switch SW1(2) is pressed to charge the standard capacitor C (6) and the capacitor Cx (5) to be tested, the indication E of the voltmeter (7) is recorded, and the first electronic switch SW1(2) is loosened. The linked single-pole double-throw switch SW7(8) is turned to the lower end, and the number U of the voltmeter (7) is recorded.
According to the following steps:
EXAMPLE III
Referring to fig. 3, which is a circuit diagram of an embodiment 3 of the method and apparatus for measuring capacitor capacitance according to the present invention, first, the capacitor Cx (5) to be measured is placed into the test hole, and then turned on, the third electronic switch SW3(4) is turned on, the capacitor Cx (5) to be measured is discharged, the discharge is completed, and the third electronic switch SW3(4) is turned off.
And (3) switching on the first electronic switch SW1(2), charging the standard capacitor C (6) and the capacitor Cx (5) to be measured, measuring the voltage E by the capacitance meter (9), and switching off the first electronic switch SW1 (2).
And changing the state of the linked switch SW (10), and recording the voltage measured by the capacitance meter (9) at the moment as U.
According to
Cx is determined and displayed on a capacitance table (9).
The embodiment 1, the embodiment 2 and the embodiment 3 all include a first loop for discharging the capacitor to be measured, a second loop for charging the standard capacitor and the capacitor to be measured and recording the charging voltage, and a third loop for transferring the electric quantity of the standard capacitor and the capacitor to be measured and recording the voltage after transferring, FIG. 4 is a schematic diagram of a shift control switching circuit of the apparatus for measuring capacitor capacitance provided by the present invention, the gear switching of the gear switch is converted into an electric signal, the electric signal is transmitted to the gear control switching module to switch the states of the first electronic switch SW1(2), the second electronic switch SW2(3) and the third electronic switch SW3(4), so that the whole circuit is controlled to be switched among the working states of the first loop, the second loop and the third loop, and the gear control switching module can be realized through a single chip microcomputer, a dsp and a fpga programming or through circuit combination. The capacitor to be tested can be connected into the circuit by clamping the capacitor pins through the conductive clamp, and the clamping device can clamp multiple capacitors by using an electrolytic capacitor clamping device with the patent number of CN201110129880.9 in addition to a conventional wire stripper clamping device. Compared with connection measurement of a wire or a meter pen, the clamping device is stable in connection, the measurement precision reduction caused by poor contact is not easy to occur, and meanwhile, the clamping device is more convenient to connect than the wire when pins are reversed.
Fig. 5 is a circuit diagram of an embodiment 4 of the apparatus for measuring capacitor capacitance according to the present invention, the capacitor Cx (5) to be measured is connected, the start key (11) is pressed, and under the action of software, the control chip switches on the electronic switch SW3(4), so that the circuit is in the first loop state, and discharges the capacitor Cx (5), and the discharge is completed; the control chip switches off the SW3(4), then simultaneously switches on the SW1(2) and the SW (10), so that the circuit is in a second loop state, the standard capacitor C (6) and the capacitor Cx (5) to be measured are charged, and after the charging is finished, the control chip reads and stores a charging voltage value E from a voltage sampling point A0 (12); switching off SW1(2), switching SW 10 to make the circuit in the third loop state, after stabilizing, the control chip reads and stores the voltage value U at A0(12) according to
And after the control chip operates, displaying the value of the capacitor Cx (5) to be measured on a display screen.
The above embodiments are merely illustrative of the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the content of the present invention and implement the present invention, and not to limit the scope of the present invention, and all equivalent changes or modifications made according to the spirit of the present invention or any changes that can be made by those skilled in the art should fall within the scope of the present invention, and should be covered by the present invention.
Claims (10)
1. The device for measuring the capacitance of the capacitor is characterized by comprising a first loop for discharging the capacitance to be measured, a second loop for charging the standard capacitance and the capacitance to be measured and recording charging voltage, a third loop for transferring the electric quantity of the standard capacitance and the capacitance to be measured and recording the voltage after the transfer, and a switch combination for switching the whole circuit among the working state of the first loop, the working state of the second loop and the working state of the third loop.
2. The apparatus for measuring capacitor capacitance of claim 1, further comprising a power supply, and a voltmeter, a standard capacitor, a capacitor to be measured, a third electronic switch connected in parallel to said power supply, further comprising a first electronic switch connected in series between said power supply and a branch formed by said voltmeter, said standard capacitor, said capacitor to be measured, said third electronic switch, and further comprising a second electronic switch connected in series between a branch formed by said power supply, said voltmeter, said standard capacitor and said capacitor to be measured, and a branch formed by said third electronic switch;
the switching mode of the working state of each loop is as follows:
when the first electronic switch is turned off, the second electronic switch is turned off, and the third electronic switch is turned on, the whole circuit is in a first loop working state, wherein the capacitor to be tested and the third electronic switch form the first loop; when the third electronic switch is switched off and the first electronic switch and the second electronic switch are switched on, the whole circuit is in a second loop working state, and the power supply, the voltmeter, the capacitor to be tested, the standard capacitor, the first electronic switch and the second electronic switch form a second loop; when the first electronic switch and the third electronic switch are disconnected, the two ends of the capacitor to be tested are reversely connected into the whole circuit, the second electronic switch is closed, the whole circuit is in a third loop working state, and the voltmeter, the capacitor to be tested, the standard capacitor and the second electronic switch form the third loop.
3. The apparatus for measuring capacitor capacitance according to claim 1, further comprising a power supply, and a voltmeter and a standard capacitor connected in parallel to the power supply, wherein a linkage single-pole double-throw switch is further connected to two ends of a branch formed by the voltmeter and the standard capacitor, when the linkage single-pole double-throw switch is in a first switch state, a capacitor to be measured is connected in parallel with a third electronic switch and then connected in series with the linkage single-pole double-throw switch, and when the linkage single-pole double-throw switch is in a second switch state, two ends of the capacitor to be measured are connected in reverse and in parallel with the standard capacitor;
the switching mode of the working state of each loop is as follows:
when the linkage single-pole double-throw switch is in an idle state and the third electronic switch is closed, the whole circuit is in a first loop working state, wherein the capacitor to be tested and the third electronic switch form the first loop; when the third electronic switch is switched off, the linkage single-pole double-throw switch is in a first switch state, and the first electronic switch is switched on, the whole circuit is in a second loop working state, wherein the power supply, the voltmeter, the capacitor to be tested, the standard capacitor and the first electronic switch form the second loop; when the first electronic switch is switched off, the third electronic switch is switched off, and the linkage single-pole double-throw switch is in the second switch state, the whole circuit is in a third loop working state, wherein the voltmeter, the capacitor to be tested and the standard capacitor form the third loop.
4. The device for measuring the capacitance of the capacitor according to claim 1, further characterized by comprising a power supply, and a capacitance meter and a standard capacitor which are connected in parallel with the power supply, wherein a linked switch is further connected to two ends of a branch formed by the capacitance meter and the standard capacitor, when the linked switch is in a first switch state, the capacitor to be measured is connected in parallel with a third electronic switch and then connected in series with the linked switch, and when the linked switch is in a second switch state, two ends of the capacitor to be measured are connected in parallel with the standard capacitor after being inverted;
the switching mode of the working state of each loop is as follows:
when the first electronic switch is switched off, the linkage switch is in any state, and the third electronic switch is switched on, the whole circuit is in a first loop working state, wherein the capacitor to be tested and the third electronic switch form the first loop; when the third electronic switch is switched off, the linkage switch is in a first switch state, and the first electronic switch is switched on, the whole circuit is in a second loop working state, wherein the power supply, the capacitance meter, the capacitor to be measured, the standard capacitor and the first electronic switch form the second loop, and at the moment, the capacitance meter records the measured voltage E; when the first electronic switch is switched off, the third electronic switch is switched off, and the linkage switch is in a second switch state, the whole circuit is in a third loop working state, wherein the capacitance meter, the capacitor to be measured and the standard capacitor form the third loop, and at the moment, the capacitance meter records the measured voltage U.
When the measurement is finished, according to the standard capacitance value C, the capacitance meter displays the measured capacitance value according to the following formula:
5. the device for measuring capacitor capacitance according to claim 1, further characterized by comprising a power supply and a standard capacitor connected in parallel to the power supply, wherein a first electronic switch is connected in series between the power supply and the standard capacitor, a linked switch is further connected at two ends of the standard capacitor, and when the linked switch is in a first switch state, the capacitor to be measured is connected in parallel with a third electronic switch and then is connected in series with the linked switch; when the linkage switch is in a second switch state, two ends of the capacitor to be detected are connected with the standard capacitor in parallel after being reversed;
the switch states of the first electronic switch, the second electronic switch and the third electronic switch are controlled by a control chip, the common connection point of the first electronic switch, the linkage switch and the standard capacitor is a voltage sampling point, the voltage sampling point is connected to the control chip for voltage sampling, the control chip is further connected with a display screen, and the control chip is further connected with a start key;
the switching mode of the working state of each loop is as follows:
when the control chip outputs a control signal, the first electronic switch is switched off, the linkage switch is in any state, and the third electronic switch is switched on, the whole circuit is in a first loop working state, wherein the capacitor to be tested and the third electronic switch form the first loop; when the control chip outputs a control signal, the third electronic switch is switched off, the linkage switch is in a first switch state, and the first electronic switch is switched on, the whole circuit is in a second loop working state, wherein the power supply, the capacitor to be tested, the standard capacitor and the first electronic switch form the second loop, and at the moment, the voltage value measured by the control chip from the voltage sampling point is E; when the first electronic switch is switched off, the third electronic switch is switched off, and the linkage switch is in a second switch state, the whole circuit is in a third loop working state, wherein the capacitor to be tested and the standard capacitor form the third loop, and at the moment, the voltage value measured by the control chip from the voltage sampling point is U; the switching mode of each loop is automatic switching, the automatic switching mode is that after a start key is pressed, the control chip switches the sampling of each electronic switch and each voltage sampling point according to the switching mode of the working state of each loop, wherein the time of the whole loop in the working state of the first loop is set as first working time by the control chip, the time in the working state of the second loop is set as second working time by the control chip, the time in the working state of the third loop is set as third working time by the control chip, the control chip marks that the measurement is finished after the first working time, the second working time and the third working time are finished, and according to a standard capacitance value C, the control chip outputs a capacitance value result to be measured to a display screen for displaying after being measured and calculated according to the following formula:
6. the capacitor capacitance test device of any one of claims 1-5, further comprising a housing for carrying an integral circuit except the capacitor to be tested, which is connected to the circuit by a stylus or conductive clip.
7. The capacitor capacitance measuring device of any one of claims 1-5, wherein the electronic switch is switched by a shift switch, and when the shift switch is switched to a first shift position, the integrated circuit is in a first loop operating state, and when the shift switch is switched to a second shift position, the integrated circuit is in a second loop operating state, and when the shift switch is switched to a third shift position, the integrated circuit is in a third loop operating state.
8. A method for measuring capacitance of a capacitor is characterized by comprising a step S1 of discharging the capacitor to be measured, a step S2 of charging a standard capacitor and the capacitor to be measured and recording charging voltage, and a step S3 of transferring electric quantity to the standard capacitor and the capacitor to be measured and recording voltage after transferring, wherein switching among the steps S1, S2 and S3 is achieved by switching the state of a switch combination.
9. The method for measuring capacitor capacitance as claimed in claim 8, further characterized in that the automatic switching of step S1, step S2, step S3 is done by one key by activating a key connection control chip, and the result is outputted to a display screen after the result is automatically calculated.
10. The method for measuring the capacitance of a capacitor as claimed in any one of claims 8 or 9, wherein the capacitor pin is clamped into the circuit by a conductive clamp in the circuit to be measured.
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| CN113075459A (en) * | 2021-03-18 | 2021-07-06 | 合肥恒钧检测技术有限公司 | Electrostatic capacity detection device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113075459A (en) * | 2021-03-18 | 2021-07-06 | 合肥恒钧检测技术有限公司 | Electrostatic capacity detection device |
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