CN220961649U - Universal meter with capacitance loss rate detection function - Google Patents
Universal meter with capacitance loss rate detection function Download PDFInfo
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- CN220961649U CN220961649U CN202322593330.3U CN202322593330U CN220961649U CN 220961649 U CN220961649 U CN 220961649U CN 202322593330 U CN202322593330 U CN 202322593330U CN 220961649 U CN220961649 U CN 220961649U
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- 239000003990 capacitor Substances 0.000 claims abstract description 39
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Abstract
The utility model discloses a universal meter with a capacitance loss rate detection function, which comprises a capacitance detection circuit, wherein the capacitance detection circuit comprises a charge-discharge module, a voltage acquisition module, a capacitance value calculation output module, an oscillography module and a capacitance value loss output module, wherein the capacitance value calculation output module is used for receiving the potential difference acquired by the voltage acquisition module and calculating and outputting capacitance values of a tested capacitor; the screen display module can display the obtained capacitance value and the capacitance loss rate on a screen display system, and an electronic electrician serviceman can judge whether the tested capacitor needs to be replaced by a stand-by horse according to the capacitance loss rate value or can continue to use the tested capacitor for a period of time.
Description
Technical Field
The utility model relates to the field of measuring ammeter, in particular to a multimeter with a capacitance loss rate detection function.
Background
The universal meter is a multifunctional and multi-range measuring instrument, is widely used for manufacturing, overhauling and other works of various electric equipment, can be used for measuring various electrical parameters such as alternating current, direct current, voltage, resistance and the like, can be used for measuring capacitance, and can be used for judging whether a measured piece is scrapped or not through measuring the capacitance.
The universal meter in the prior art is provided with the capacitance detection module, but the universal meter can only detect and display the quality of the capacitance, but the capacitance of some measured pieces close to the invalid or scrapped edge cannot be prompted, an electronic electrician serviceman cannot make a plan treatment in advance according to the displayed quality result of the capacitance, so that some measured pieces close to the invalid or scrapped edge cannot be identified, the measured pieces are likely to be invalid or scrapped in a short time, and the measured pieces need to be measured again, so that the work of the electronic electrician serviceman is burdened.
For example, CN 103926442B discloses a pointer multimeter with a function of measuring a capacitance value, in which an RC low-frequency oscillating circuit is set, and a capacitive reactance method is adopted to make a low-frequency signal pass through a measured capacitor, so that different values are obtained and reflected on a capacitance value scale bar in a meter head, and the pointer multimeter has a simple structure, is convenient to use, and can intuitively display capacitance values. Although the capacitance value can be intuitively displayed in the patent, the loss condition of the capacitance value cannot be intuitively displayed, and an electronic electrician serviceman cannot accurately judge whether the capacitance is at the failure or scrapped edge according to the capacitance value, and needs to judge by means of the cooperation of multiple tools, so that the process is complex and the operation is inconvenient under the condition of limited working environment.
Disclosure of utility model
The technical problem to be solved by the utility model is to provide the universal meter with the capacitance loss rate detection function, which can intuitively and clearly display the capacitance value and the capacitance loss rate of the measured capacitance.
In order to solve the technical problems, the technical scheme of the utility model is as follows: universal meter with loss rate of capacitance detects function, including the universal meter body, be equipped with main control chip, universal meter probe pen and screen display system on the universal meter body, still include:
The capacitance detection circuit is arranged in the main control chip and comprises a charge-discharge module, a voltage acquisition module, a capacitance value calculation output module, an oscillography module and a capacitance value loss output module, wherein the charge-discharge module is used for realizing charge and discharge of a measured capacitor by storing and releasing charges, the voltage acquisition module is used for detecting and acquiring potential differences at two ends of the measured capacitor, the capacitance value calculation output module is used for receiving the potential differences acquired by the voltage acquisition module and calculating and outputting capacitance values of the measured capacitor, the oscillography module is used for detecting voltage and current waveforms of the measured capacitor and transmitting the voltage and current waveforms of the measured capacitor to the capacitance value loss output module, and the capacitance value loss output module is used for calculating the capacitance loss rate of the measured capacitor by combining the voltage waveforms, the current waveforms, the capacitance values, the voltage, the resistance values and the current frequency of the measured capacitor;
The screen display module is arranged in the main control chip and is used for displaying the capacitance value and the capacitance loss rate obtained in the capacitance detection circuit on the screen display system.
As a preferable technical scheme, the oscillography module can detect the voltage and current waveforms of the tested capacitor, calculate the ripple voltage and the ripple current according to the waveforms, obtain the equivalent resistance according to the ratio of the ripple voltage to the ripple current, calculate the equivalent resistance combined with the current frequency and the capacitance value to obtain the loss angle, and calculate the capacitance loss rate by combining the loss angle with the voltage, the resistance value, the current frequency and the capacitance value.
As an preferable technical scheme, the screen display module includes a capacitance value display module and a capacitance loss rate display module, where the capacitance value display module receives the capacitance value in the capacitance detection circuit and displays the capacitance value on the screen display system, and the capacitance loss rate display module receives the capacitance loss rate in the capacitance detection circuit and displays the capacitance loss rate on the screen display system.
As an optimal technical scheme, the screen display system is an LCD display module.
Due to the adoption of the technical scheme, the utility model has the beneficial effects that: the capacitance detection circuit can calculate and output capacitance value and capacitance loss rate, wherein the capacitance loss rate refers to energy loss generated by a capacitor during working, the energy loss can be calculated by the capacitance detection circuit and displayed in the screen display module, the larger the capacitance loss rate is, the more serious the loss of the measured capacitor is, and an electronic electrician serviceman can judge whether the measured capacitor needs to be replaced by a standing horse or not according to the value of the capacitance loss rate by experience, or the measured capacitor can be continuously used for a period of time, so that the use of the electronic electrician serviceman is facilitated.
Drawings
The following drawings are only for purposes of illustration and explanation of the present utility model and are not intended to limit the scope of the utility model.
FIG. 1 is a block diagram of an embodiment of the present utility model;
In the figure: 10-a main control chip; 20-a universal meter probe pen; 30-a screen display system; 40-a capacitance detection circuit; 41-a charge-discharge module; 42-a voltage acquisition module; 43-a capacitance value calculation output module; 44-oscillography module; 45-capacity loss output module; 50-a screen display module; 51-a capacitance value display module; 52-capacitive loss rate display module.
Detailed Description
The utility model is further illustrated in the following, in conjunction with the accompanying drawings and examples. In the following detailed description, certain exemplary embodiments of the present utility model are described by way of illustration only. It is needless to say that the person skilled in the art realizes that the described embodiments may be modified in various different ways without departing from the spirit and scope of the utility model. Accordingly, the drawings and description are to be regarded as illustrative in nature and not as restrictive in scope.
As shown in FIG. 1, the multimeter with the capacitance loss rate detection function comprises a multimeter body, wherein a main control chip 10, a multimeter probe pen 20 and a screen display system 30 are arranged on the multimeter body, the screen display system 30 is an LCD display module, and the multimeter body further comprises a capacitance detection circuit 40 and a screen display module 50. The utility model is improved on the basis of the original universal meter, and the voltage, resistance and current frequency of the measured capacitor on the original universal meter are all measured in the prior art and are not repeated here.
The capacitance detection circuit 40 is disposed in the main control chip 10, and can calculate an output capacitance value and a capacitance loss rate, wherein the capacitance loss rate refers to energy loss generated by the capacitor during operation, and can be calculated by the capacitance detection circuit 40 and displayed in the screen display module 50, and the larger the capacitance loss rate is, the more serious the loss of the measured capacitor is, the more serious the electronic maintenance personnel can determine whether to replace the measured capacitor with a stand horse according to the value of the capacitance loss rate, or the measured capacitor can be continuously used for a period of time.
The screen display module 50 is disposed in the main control chip 10, and is configured to display the capacitance value and the capacitance loss rate obtained in the capacitance detection circuit 40 on the screen display system 30, where the capacitance value and the capacitance loss rate can be directly displayed in digital form, and can be directly observed by an electrician from the screen display system 30. The screen display module 50 includes a capacitance value display module 51 and a capacitance loss rate display module 52, where the capacitance value display module 51 receives the capacitance value in the capacitance detection circuit 40 and displays the capacitance value on the screen display system 30, and the capacitance loss rate display module 52 receives the capacitance loss rate in the capacitance detection circuit 40 and displays the capacitance loss rate on the screen display system 30.
The capacitance detection circuit 40 includes a charge-discharge module 41, a voltage acquisition module 42, a capacitance calculation output module 43, an oscillography module 44 and a capacitance loss output module 45, where the charge-discharge module 41 stores and releases charges to charge and discharge a measured capacitance, the voltage acquisition module 42 is used to detect and acquire a potential difference at two ends of the measured capacitance, the capacitance calculation output module 43 receives the potential difference acquired by the voltage acquisition module 42 and calculates and outputs a capacitance value of the measured capacitance, the oscillography module 44 is used to detect a voltage and a current waveform of the measured capacitance and transmit the voltage and current waveforms to the capacitance loss output module 45, and the capacitance loss output module 45 combines the voltage waveform, the current waveform, the capacitance value, the voltage, the resistance value and the current frequency of the measured capacitance to calculate a capacitance loss rate of the measured capacitance.
The oscillography module 44 can detect the voltage and current waveforms of the measured capacitor, calculate the ripple voltage and ripple current according to the waveforms, obtain the equivalent resistance according to the ratio of the ripple voltage and the ripple current, calculate the loss angle according to the equivalent resistance, the current frequency and the capacitance value, and calculate the capacitance loss rate according to the loss angle, the resistance value, the current frequency and the capacitance value.
The equivalent resistance is a resistance value equivalent to the loss heat generated by the magnetic field, the electric leakage and the like in the working state of the capacitor, and equivalent resistance esr=ripple voltage/ripple current.
Loss tangent Tan delta=esr/Xc, wherein Xc is capacitance reactance of the capacitor, xc=1/ωc, ω=2pi f, f is current frequency of the capacitor to be measured, and C is capacitance value of the capacitor to be measured;
Capacitance loss rate p=v·ic·cos δ, where Ic is the loss current of the measured capacitance and V is the voltage of the measured capacitance;
And the loss current ic=v/Z, where Z is the total reactance, and the total reactance z= (rζ2+xc ζ2)/(1/2) = (rζ2+1/(ωζ2·cζ2))/(1/2), where R is the resistance value of the measured capacitance;
As can be seen from the above formula, the capacitance loss rate is related to the voltage, the resistance value, the current frequency, the capacitance value, the ripple voltage and the ripple current of the measured capacitor, wherein the voltage, the resistance value, the current frequency and the capacitance value of the measured capacitor can be directly measured by the multimeter, and the ripple voltage and the ripple current are obtained by the voltage waveform and the current waveform detected by the oscillography module 44, so that the capacitance loss rate can be calculated by applying the oscillography principle of the oscillography module 44 to the multimeter.
When the device is used, the measured capacitor is measured by adopting the universal meter, the voltage, the resistance value, the current frequency and the capacitance value are respectively collected and recorded, then the ripple voltage and the ripple current are combined to calculate the capacitance loss rate, and finally the capacitance loss rate is displayed through a screen. The capacitance loss rate and the capacitance value are visually displayed by the screen display system 30, and an electronic electrician can combine the two data provided by the electronic electrician and judge whether the electronic electrician is at the invalid or scrapped edge or not according to experience, and whether the tested capacitor needs to be replaced by a stand-alone horse or can be used for a period of time.
The foregoing has shown and described the basic principles, main features and advantages of the present utility model. It will be understood by those skilled in the art that the present utility model is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present utility model, and various changes and modifications may be made without departing from the spirit and scope of the utility model, which is defined in the appended claims. The scope of the utility model is defined by the appended claims and equivalents thereof.
Claims (4)
1. Universal meter with loss rate of capacitance detects function, including the universal meter body, be equipped with main control chip, universal meter probe pen and screen display system on the universal meter body, its characterized in that still includes:
The capacitance detection circuit is arranged in the main control chip and comprises a charge-discharge module, a voltage acquisition module, a capacitance value calculation output module, an oscillography module and a capacitance value loss output module, wherein the charge-discharge module is used for realizing charge and discharge of a measured capacitor by storing and releasing charges, the voltage acquisition module is used for detecting and acquiring potential differences at two ends of the measured capacitor, the capacitance value calculation output module is used for receiving the potential differences acquired by the voltage acquisition module and calculating and outputting capacitance values of the measured capacitor, the oscillography module is used for detecting voltage and current waveforms of the measured capacitor and transmitting the voltage and current waveforms of the measured capacitor to the capacitance value loss output module, and the capacitance value loss output module is used for calculating the capacitance loss rate of the measured capacitor by combining the voltage waveforms, the current waveforms, the capacitance values, the voltage, the resistance values and the current frequency of the measured capacitor;
The screen display module is arranged in the main control chip and is used for displaying the capacitance value and the capacitance loss rate obtained in the capacitance detection circuit on the screen display system.
2. The multimeter with capacitive loss rate detection function of claim 1 wherein: the oscillography module can detect the voltage and current waveforms of the tested capacitor, calculate ripple voltage and ripple current according to the waveforms, obtain equivalent resistance according to the ratio of the ripple voltage to the ripple current, calculate the equivalent resistance in combination with current frequency and capacitance value to obtain a loss angle, and calculate the loss rate of the capacitor in combination with the voltage, resistance value, current frequency and capacitance value.
3. The multimeter with capacitive loss rate detection function of claim 1 wherein: the screen display module comprises a capacitance value display module and a capacitance loss rate display module, wherein the capacitance value display module receives the capacitance value in the capacitance detection circuit and displays the capacitance value on the screen display system, and the capacitance loss rate display module receives the capacitance loss rate in the capacitance detection circuit and displays the capacitance loss rate on the screen display system.
4. The multimeter with capacitive loss rate detection function of claim 1 wherein: the screen display system is an LCD display module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322593330.3U CN220961649U (en) | 2023-09-22 | 2023-09-22 | Universal meter with capacitance loss rate detection function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322593330.3U CN220961649U (en) | 2023-09-22 | 2023-09-22 | Universal meter with capacitance loss rate detection function |
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| Publication Number | Publication Date |
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| CN220961649U true CN220961649U (en) | 2024-05-14 |
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| CN202322593330.3U Active CN220961649U (en) | 2023-09-22 | 2023-09-22 | Universal meter with capacitance loss rate detection function |
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- 2023-09-22 CN CN202322593330.3U patent/CN220961649U/en active Active
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