CN221056549U - Insulation resistance measuring device - Google Patents
Insulation resistance measuring device Download PDFInfo
- Publication number
- CN221056549U CN221056549U CN202322645907.0U CN202322645907U CN221056549U CN 221056549 U CN221056549 U CN 221056549U CN 202322645907 U CN202322645907 U CN 202322645907U CN 221056549 U CN221056549 U CN 221056549U
- Authority
- CN
- China
- Prior art keywords
- circuit
- voltage
- sampling
- current
- insulation resistance
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000009413 insulation Methods 0.000 title claims abstract description 48
- 238000005070 sampling Methods 0.000 claims abstract description 92
- 238000005259 measurement Methods 0.000 claims abstract description 72
- 238000006243 chemical reaction Methods 0.000 claims abstract description 41
- 230000009467 reduction Effects 0.000 claims abstract description 35
- 238000012360 testing method Methods 0.000 claims abstract description 26
- 238000012545 processing Methods 0.000 claims abstract description 21
- 239000003990 capacitor Substances 0.000 claims description 9
- 230000003321 amplification Effects 0.000 claims description 7
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 7
- 238000009499 grossing Methods 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- 230000000630 rising effect Effects 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 22
- 238000000034 method Methods 0.000 description 17
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000001965 increasing effect Effects 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 239000012774 insulation material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
Landscapes
- Measurement Of Resistance Or Impedance (AREA)
Abstract
The application belongs to the technical field of insulation resistance, and particularly relates to an insulation resistance measuring device, which comprises a direct-current high-voltage inversion module, a voltage reduction circuit, a conversion circuit, an output circuit, a negative feedback circuit and a control circuit, wherein the voltage reduction circuit, the conversion circuit and the output circuit are sequentially connected, the negative feedback circuit is respectively connected with the output circuit and the voltage reduction circuit, and the control circuit is respectively connected with the negative feedback circuit and the conversion circuit; the voltage sampling measurement module is used for sampling voltages at two ends of the equipment to be measured and outputting a voltage measurement sampling signal; the current sampling measurement module is used for sampling the current flowing through the equipment to be measured and outputting a current measurement sampling signal; and the processing module is used for generating insulation resistance of the equipment to be measured according to the voltage measurement sampling signal and the current measurement sampling signal. The insulation resistance measuring device can rapidly improve the rising speed of direct-current high voltage through the direct-current high-voltage inversion module, reduce the test time and improve the measuring efficiency.
Description
Technical Field
The application relates to the technical field of insulation resistance measurement, in particular to an insulation resistance measurement device.
Background
Insulation resistance measurement is an important parameter for measuring the insulation performance of power electronic devices, and insulation material resistance measurement is a strong inspection item in electrical equipment safety inspection items specified by metering methods in China. Insulation resistance measuring instruments are multifunctional instruments, also known as megohmmeters, used to detect insulation resistance of transformers, motors, cables, and other power electronics or insulation materials. The measuring method of the insulation resistance can be divided into a current-voltage method, a capacitance charging method, a voltage comparison method, a bridge method and the like, and each method has advantages, disadvantages and application ranges when measuring the resistance.
In the related art, the basic principle of measuring insulation resistance by an insulation resistance measuring instrument is that a voltammetric measurement resistance is adopted, specifically, a direct current power supply is applied to equipment to be measured, and according to ohm's law, the insulation resistance value of the equipment to be measured is obtained by applying voltages at two ends of the equipment to be measured and current generated in backflow under the action of high voltage, and the ratio of the voltages to be measured is obtained. In practical measurement, it is difficult to perform rapid measurement, and it is often necessary to measure the insulation resistance value a few seconds after the start of measurement, and it is difficult to meet the requirement of rapid measurement of insulation resistance.
It should be noted that the information disclosed in the above background section is only for enhancing understanding of the background of the present disclosure and thus may include information that does not form the prior art that is already known to those of ordinary skill in the art.
Disclosure of utility model
In view of at least one of the above technical problems, the present application provides an insulation resistance measurement device, which solves the technical problems that in practical application, insulation resistance is difficult to rapidly measure and waiting time is too long.
An embodiment of the present application provides an insulation resistance measurement device, including:
The direct-current high-voltage inversion module comprises a voltage reduction circuit, a conversion circuit, an output circuit, a negative feedback circuit and a control circuit, wherein the voltage reduction circuit, the conversion circuit and the output circuit are sequentially connected, the negative feedback circuit is respectively connected with the output circuit and the voltage reduction circuit, the control circuit is respectively connected with the negative feedback circuit and the conversion circuit, the voltage reduction circuit is used for providing an original signal, the conversion circuit is used for amplifying power of the original signal and outputting a direct-current signal, the output circuit is used for rectifying and smoothing the direct-current signal and outputting a test signal, the test signal is applied to two ends of equipment to be measured, the negative feedback circuit is used for monitoring the test signal and feeding back to the voltage reduction circuit, the voltage reduction circuit regulates and controls the original signal, and the negative feedback circuit is also used for controlling the conversion circuit through the control circuit so as to realize current limiting of the direct-current high-voltage inversion module;
The voltage sampling measurement module is used for sampling voltages at two ends of the equipment to be measured and outputting a voltage measurement sampling signal;
the current sampling measurement module is used for sampling the current flowing through the equipment to be measured and outputting a current measurement sampling signal;
And the processing module is used for generating insulation resistance of the equipment to be measured according to the voltage measurement sampling signal and the current measurement sampling signal.
The application has the following technical effects: the insulation resistance measuring device can rapidly improve the rising speed of direct-current high voltage through the direct-current high-voltage inversion module, so that the test time is shortened, and the measuring efficiency is improved.
In some alternative implementations, the buck circuit includes a buck chip having an output and a feedback input, the output of the buck chip being connected to the transform circuit for outputting the original signal to the transform circuit;
The negative feedback circuit comprises a voltage feedback circuit which is respectively connected with the output circuit and the feedback input end of the voltage reduction chip and is used for collecting test signals and feeding the test signals back to the voltage reduction circuit so that the voltage reduction circuit regulates and controls the original signals;
The buck chip is configured to adjust its duty cycle according to the test signal, so that the original signal remains stable.
In some alternative implementations, the conversion circuit includes a push-pull transformer having a first input, a second input, a third input, and an output, the first input of the push-pull transformer being connected to the output of the buck chip, the output of the push-pull transformer being connected to the output circuit;
The negative feedback circuit further comprises a current feedback circuit, and the current feedback circuit is connected with the output circuit;
The control circuit comprises a control chip and an error amplification module, wherein the control chip is provided with a control end, an input end, a first mediation output end and a second mediation output end, the input end of the control chip is connected with the current feedback circuit, the first mediation output end of the control chip is connected with the second input end, the second mediation output end of the control chip is connected with the third input end, and the control end of the control chip is connected with the error amplification module.
In some alternative implementations, the error amplifying module includes a capacitor C33, a resistor R49, and a reference power source vref_3v, where one end of the capacitor C33 is connected to the control end of the control chip, one end of the resistor R49 is connected to the other end of the capacitor C33, and the other end of the resistor R49 is connected to the reference power source vref_3v.
In some alternative implementations, the output circuit includes a full-wave rectifying circuit coupled to the push-pull transformer and a filter circuit coupled to the current feedback circuit, the filter circuit coupled to the full-wave rectifying circuit and the filter circuit coupled to the voltage feedback circuit.
In some optional implementations, the voltage sampling measurement module includes a voltage sampling circuit, a voltage following circuit, an absolute value amplifying circuit, a rectification processing circuit and a first ADC sampling circuit, where the voltage sampling circuit is connected with one end of the voltage following circuit, the voltage sampling circuit is used for sampling voltages at two ends of the device to be measured, one end of the absolute value amplifying circuit is connected with the other end of the voltage following circuit, one end of the rectification processing circuit is connected with the other end of the absolute value amplifying circuit, one end of the first ADC sampling circuit is connected with the other end of the rectification processing circuit, and the other end of the first ADC sampling circuit is connected with the processing module.
In some alternative implementations, a port protection circuit is also provided between the sampling circuit and the device to be measured.
In some alternative implementations, the other end of the voltage follower circuit is also provided with a hysteresis comparator.
In some alternative implementations, the current sampling measurement module includes a low-pass filter circuit, a gear switching circuit, a conversion circuit, a signal inverter, and a second ADC sampling circuit, where a first end of the low-pass filter circuit is connected to the device to be measured, a first end of the gear switching circuit is connected to a second end of the low-pass filter circuit, a first end of the conversion circuit is connected to a second end of the gear switching circuit, a second end of the conversion circuit is connected to a third end of the gear switching circuit, a first end of the signal inverter is connected to a second end of the conversion circuit, a first end of the second ADC sampling circuit is connected to a second end of the signal inverter, and a second end of the second ADC sampling circuit is connected to the processing module.
The utility model will be further described with reference to the drawings and examples.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following description will briefly explain the embodiments or the drawings needed in the prior art, and it is obvious that the drawings in the following description are only some embodiments of the present application and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a block diagram of an insulation resistance measuring device according to an embodiment of the present application;
Fig. 2 is a first structural diagram of a dc high voltage inverter module according to an embodiment of the present application;
Fig. 3 is a second structural diagram of the dc high voltage inverter module according to the embodiment of the present application;
FIG. 4 is a block diagram of a voltage sampling measurement module according to an embodiment of the present application;
FIG. 5 is a block diagram of a current sampling measurement module according to an embodiment of the present application;
fig. 6 is a circuit diagram of a step-down circuit shown in an embodiment of the present application;
fig. 7 is a circuit diagram of a conversion circuit and an output circuit according to an embodiment of the present application;
FIG. 8 is a circuit diagram of a voltage feedback circuit according to an embodiment of the present application;
FIG. 9 is a circuit diagram of a current feedback circuit, control circuit, shown in an embodiment of the present application;
FIG. 10 is a circuit diagram of a voltage sampling measurement module according to an embodiment of the present application;
FIG. 11 is a circuit diagram of a current sampling measurement module according to an embodiment of the present application;
Detailed Description
In order that the above objects, features and advantages of the application will be readily understood, a more particular description of the application will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. The present application may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the application, whereby the application is not limited to the specific embodiments disclosed below.
In the related art, the basic principle of measuring insulation resistance by an insulation resistance measuring instrument is that a voltammetric measurement resistance is adopted, specifically, a direct current power supply is applied to equipment to be measured, and according to ohm's law, the insulation resistance value of the equipment to be measured is obtained by applying voltages at two ends of the equipment to be measured and current generated in backflow under the action of high voltage, and the ratio of the voltages to be measured is obtained. In practical measurement, it is difficult to perform rapid measurement, and it is often necessary to measure the insulation resistance value a few seconds after the start of measurement, and it is difficult to meet the requirement of rapid measurement of insulation resistance. The insulation resistance measuring device can rapidly improve the rising speed of direct-current high voltage through the direct-current high-voltage inversion module, so that the test time is shortened, and the measuring efficiency is improved.
Referring to fig. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 and 11, fig. 1 is a block diagram of an insulation resistance measuring device according to an embodiment of the present application; fig. 2 is a first structural diagram of a dc high voltage inverter module according to an embodiment of the present application; fig. 3 is a second structural diagram of the dc high voltage inverter module according to the embodiment of the present application; FIG. 4 is a block diagram of a voltage sampling measurement module according to an embodiment of the present application; FIG. 5 is a block diagram of a current sampling measurement module according to an embodiment of the present application; fig. 6 is a circuit diagram of a step-down circuit shown in an embodiment of the present application; fig. 7 is a circuit diagram of a conversion circuit and an output circuit according to an embodiment of the present application; FIG. 8 is a circuit diagram of a voltage feedback circuit according to an embodiment of the present application; FIG. 9 is a circuit diagram of a current feedback circuit, control circuit, shown in an embodiment of the present application; FIG. 10 is a circuit diagram of a voltage sampling measurement module according to an embodiment of the present application; FIG. 11 is a circuit diagram of a current sampling measurement module according to an embodiment of the present application; in a first aspect of an embodiment of the present application, there is provided an insulation resistance measurement apparatus including: the system comprises a direct current high voltage inversion module 100, a voltage sampling measurement module 200, a current sampling measurement module 300 and a processing module.
Referring to fig. 1 to 11, the dc high voltage inverter module 100 is used for rapidly increasing the rising speed of the dc high voltage, so as to reduce the test time and improve the test efficiency. The voltage sampling measurement module 200 is used for obtaining voltages at two ends of the device to be measured. The current sampling measurement module 300 is used to obtain the current flowing through the device to be measured. The processing module is used for calculating an insulation resistance value of the equipment to be measured according to the voltage value obtained by sampling by the voltage sampling measurement module 200 and the current value obtained by sampling by the current sampling measurement module 300.
The specific circuit configuration of the insulation resistance measuring apparatus will be described in detail below.
The direct current high voltage inversion module 100 comprises a voltage reduction circuit 110, a conversion circuit 120, an output circuit 130, a negative feedback circuit 140 and a control circuit 150, wherein the voltage reduction circuit 110, the conversion circuit 120 and the output circuit 130 are sequentially connected, the negative feedback circuit 140 is respectively connected with the output circuit 130 and the voltage reduction circuit 110, the control circuit 150 is respectively connected with the negative feedback circuit 140 and the conversion circuit 120, the voltage reduction circuit 110 is used for providing an original signal, the conversion circuit 120 is used for amplifying power of the original signal and outputting a direct current signal, the output circuit 130 is used for rectifying and smoothing the direct current signal and outputting a test signal, the test signal is applied to two ends of equipment to be measured, the negative feedback circuit 140 is used for monitoring the test signal and feeding back to the voltage reduction circuit 110, the voltage reduction circuit 110 regulates and controls the original signal, and the negative feedback circuit 140 is also used for controlling the conversion circuit 120 through the control circuit 150 so as to realize current limiting of the direct current high voltage inversion module 100;
the voltage sampling measurement module 200 is used for sampling voltages at two ends of the equipment to be measured and outputting a voltage measurement sampling signal;
the current sampling measurement module 300 is used for sampling the current flowing through the equipment to be measured and outputting a current measurement sampling signal;
And the processing module is used for generating insulation resistance of the equipment to be measured according to the voltage measurement sampling signal and the current measurement sampling signal.
Referring to fig. 1 to 11, in some examples, the buck circuit 110 includes a buck chip U13, the buck chip U13 having an output terminal and a feedback input terminal, the output terminal of the buck chip U13 being connected to the transform circuit 120 for outputting an original signal to the transform circuit 120; the negative feedback circuit 140 comprises a voltage feedback circuit 141, and the voltage feedback circuit 141 is respectively connected with the output circuit 130 and the feedback input end of the voltage reduction chip U13, and is used for collecting test signals and feeding back to the voltage reduction circuit 110, so that the voltage reduction circuit 110 regulates and controls original signals; the buck chip U13 is configured to adjust its duty cycle according to the test signal, so that the original signal remains stable.
Referring to fig. 6 and 7, the model number of the buck chip U13 is PL83251. In operation, the supply voltage VBAT is converted to an adjustable voltage of 0.7 to 11V, i.e., an original signal, by the buck chip U13, and is input to the push-pull transformer of the conversion circuit 120. The original signal is used as an input voltage of a push-pull transformer of the conversion circuit 120, and a fixed-multiplying power boosting is realized to form a direct current signal. And then the full-wave rectifying circuit and the filter circuit in the output circuit 130 are used for obtaining a wide-range adjustable direct-current voltage ranging from 100 to 1100V, namely a test signal. And then the duty ratio is regulated through the buck chip U13, so that the original signal output by the buck chip U13 is stabilized at a proper voltage value, and a stable direct current high-voltage output is finally obtained.
Referring to fig. 1 to 11, in some examples, the conversion circuit 120 includes a push-pull transformer 121, the push-pull transformer 121 has a first input terminal, a second input terminal, a third input terminal, and an output terminal, the first input terminal of the push-pull transformer 121 is connected to the output terminal of the buck chip U13, and the output terminal of the push-pull transformer 121 is connected to the output circuit 130;
the negative feedback circuit 140 further includes a current feedback circuit 142, the current feedback circuit 142 being connected to the output circuit 130;
the control circuit 150 includes a control chip U4 and an error amplifying module 151, where the control chip U4 has a control end, an input end, a first adjustment output end and a second adjustment output end, the input end of the control chip U4 is connected with the current feedback circuit 142, the first adjustment output end of the control chip U4 is connected with the second input end, the second adjustment output end of the control chip U4 is connected with the third input end, and the control end of the control chip U4 is connected with the error amplifying module 151.
Referring to fig. 7, in order to cope with a rapid boosting, and the circuit requires continuous energy output while satisfying a high response speed and a small ripple, a push-pull structure is adopted. In the push-pull transformer 121, the power is increased by the power switching tube Q14 and the power switching tube Q15, so that a large current is realized to drive the push-pull transformer 121 to work.
The push-pull transformer 121 has the following advantages over a general transformer: the magnetic field utilization rate is high; the response speed is high, the energy utilization rate is low, and the energy output is continuous; the transformer and the peripheral driving design are simple; suitable for inverting low voltage to high voltage.
Referring to fig. 7 and 9, in order to implement the overcurrent protection and prevent the overcurrent from being excessive, a current feedback circuit 142 is provided. When the loop current is greater than 2 milliamperes, the loop current is fed back to the control chip U4, and then the error amplification module 151 compares and amplifies errors with the reference source VREF_3V, so that a PWM modulator in the control chip U4 is adjusted, the PWM wave duty ratio is reduced, the control of the push-pull transformer 121 is realized, and the loop current is constant to be milliamperes.
Referring to fig. 1 to 11, in some examples, the error amplifying module 151 includes a capacitor C33, a resistor R49, and a reference power source vref_3v, one end of the capacitor C33 is connected to the control end of the control chip U4, one end of the resistor R49 is connected to the other end of the capacitor C33, and the other end of the resistor R49 is connected to the reference power source vref_3v.
Referring to fig. 1 to 11, in some examples, the output circuit 130 includes a full-wave rectifying circuit 131 and a filter circuit 132, the full-wave rectifying circuit 131 is connected to the push-pull transformer 121, the full-wave rectifying circuit 131 is connected to the current feedback circuit 142, the filter circuit 132 is connected to the full-wave rectifying circuit 131, and the filter circuit 132 is connected to the voltage feedback circuit 141.
Referring to fig. 1 to 11, in some examples, the voltage sampling measurement module 200 includes a voltage sampling circuit 210, a voltage follower circuit 220, an absolute value amplifying circuit 230, a rectification processing circuit 240, and a first ADC sampling circuit, where the voltage sampling circuit 210 is connected to one end of the voltage follower circuit 220, the voltage sampling circuit 210 is used for sampling voltages at two ends of a device to be measured, one end of the absolute value amplifying circuit 230 is connected to the other end of the voltage follower circuit 220, one end of the rectification processing circuit 240 is connected to the other end of the absolute value amplifying circuit 230, one end of the first ADC sampling circuit is connected to the other end of the rectification processing circuit 240, and the other end of the first ADC sampling circuit is connected to the processing module.
Referring to fig. 1-11, in some examples, a port protection circuit 250 is also provided between the sampling circuit and the device to be measured. The port protection circuit 250 is used for surge protection of subsequent circuits.
Referring to fig. 1-11, in some examples, the other end of the voltage follower circuit 220 is also provided with a hysteresis comparator 260. The hysteresis comparator 260 is used for determining the direction of the ac/dc voltage.
Referring to fig. 1 to 11, in some examples, the current sampling measurement module 300 includes a low-pass filter circuit 310, a gear switching circuit 320, a conversion circuit 330, a signal inverter 340, and a second ADC sampling circuit, where a first end of the low-pass filter circuit 310 is connected to a device to be measured, a first end of the gear switching circuit 320 is connected to a second end of the low-pass filter circuit 310, a first end of the conversion circuit 330 is connected to a second end of the gear switching circuit 320, a second end of the conversion circuit 330 is connected to a third end of the gear switching circuit 320, a first end of the signal inverter 340 is connected to a second end of the conversion circuit 330, and a first end of the second ADC sampling circuit is connected to a second end of the signal inverter 340.
The insulation resistance measuring device of the embodiment of the application implements an insulation resistance measuring method, wherein the method comprises the following steps:
The step-down circuit 110 provides an original signal;
The conversion circuit 120 performs power amplification on the original signal and outputs a direct current signal;
The output circuit 130 rectifies and smooth filters the direct current signal and outputs a test signal for application to both ends of the device to be measured;
The negative feedback circuit 140 monitors the test signal and feeds back the test signal to the step-down circuit 110, so that the step-down circuit 110 regulates and controls the original signal;
The negative feedback circuit 140 also controls the conversion circuit 120 through the control circuit 150 to realize current limiting of the direct current high voltage inversion module 100;
The voltage sampling measurement module 200 samples voltages at two ends of the equipment to be measured and outputs a voltage measurement sampling signal;
the current sampling measurement module 300 samples a current flowing through the device to be measured and outputs a current measurement sampling signal;
the processing module generates insulation resistance of the equipment to be measured according to the voltage measurement sampling signal and the current measurement sampling signal.
It should be understood that, in various embodiments of the present application, it should be understood that the sequence numbers of the steps in the foregoing embodiments do not mean the order of execution, and the execution order of the processes should be determined by the functions and internal logic of the processes, and should not constitute any limitation on the implementation process of the embodiments of the present application. In addition, in some possible implementations, each step in the foregoing embodiments may be selectively performed according to practical situations, and may be partially performed or may be performed entirely, which is not limited herein. All or part of any features of any embodiment of the application may be freely combined without contradiction. The combined technical scheme is also within the scope of the application.
It should also be understood that, in the embodiment of the present application, the term "and/or" is merely an association relationship describing the association object, indicating that three relationships may exist. For example, a and/or B may represent: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.
Those of ordinary skill in the art will appreciate that the elements and algorithm steps described in connection with the embodiments disclosed herein may be embodied in electronic hardware, in computer software, or in a combination of the two, and that the elements and steps of the examples have been generally described in terms of function in the foregoing description to clearly illustrate the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
It will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, and are not repeated herein.
In the several embodiments provided by the present application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of elements is merely a logical functional division, and there may be additional divisions of actual implementation, e.g., multiple elements or components may be combined or integrated into another system, or some features may be omitted, or not performed. In addition, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices, or elements, or may be an electrical, mechanical, or other form of connection.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed over a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the embodiment of the present application.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above description is only of the preferred embodiment of the present application, and is not intended to limit the present application in any way. Any person skilled in the art can make many possible variations and modifications to the technical solution of the present application or modifications to equivalent embodiments using the methods and technical contents disclosed above, without departing from the scope of the technical solution of the present application. Therefore, all equivalent changes according to the shape, structure and principle of the present application are covered in the protection scope of the present application.
Claims (9)
1. An insulation resistance measuring apparatus, comprising:
The direct-current high-voltage inversion module comprises a voltage reduction circuit, a conversion circuit, an output circuit, a negative feedback circuit and a control circuit, wherein the voltage reduction circuit, the conversion circuit and the output circuit are sequentially connected, the negative feedback circuit is respectively connected with the output circuit and the voltage reduction circuit, the control circuit is respectively connected with the negative feedback circuit and the conversion circuit, the voltage reduction circuit is used for providing an original signal, the conversion circuit is used for amplifying power of the original signal and outputting a direct-current signal, the output circuit is used for rectifying and smoothing the direct-current signal and outputting a test signal, the test signal is applied to two ends of equipment to be measured, the negative feedback circuit is used for monitoring the test signal and feeding back to the voltage reduction circuit so that the voltage reduction circuit regulates and controls the original signal, and the negative feedback circuit is also used for controlling the conversion circuit through the control circuit so as to realize current limiting of the direct-current high-voltage inversion module;
The voltage sampling measurement module is used for sampling voltages at two ends of the equipment to be measured and outputting a voltage measurement sampling signal;
the current sampling measurement module is used for sampling the current flowing through the equipment to be measured and outputting a current measurement sampling signal;
The processing module is used for generating insulation resistance of the equipment to be measured according to the voltage measurement sampling signal and the current measurement sampling signal;
The voltage reduction circuit comprises a voltage reduction chip, the voltage reduction chip is provided with an output end and a feedback input end, the output end of the voltage reduction chip is connected with the conversion circuit and used for outputting an original signal to the conversion circuit, and the model of the voltage reduction chip is PL83251.
2. The insulation resistance measuring device according to claim 1, wherein the negative feedback circuit comprises a voltage feedback circuit, the voltage feedback circuit is respectively connected with the output circuit and the feedback input end of the voltage reduction chip, and is used for collecting test signals and feeding the test signals back to the voltage reduction circuit so that the voltage reduction circuit regulates and controls original signals;
The buck chip is configured to adjust its duty cycle according to the test signal to keep the original signal stable.
3. The insulation resistance measurement device according to claim 2, wherein the conversion circuit includes a push-pull transformer having a first input terminal, a second input terminal, a third input terminal, and an output terminal, the first input terminal of the push-pull transformer being connected to the output terminal of the step-down chip, the output terminal of the push-pull transformer being connected to the output circuit;
the negative feedback circuit further comprises a current feedback circuit, and the current feedback circuit is connected with the output circuit;
the control circuit comprises a control chip and an error amplification module, wherein the control chip is provided with a control end, an input end, a first mediation output end and a second mediation output end, the input end of the control chip is connected with the current feedback circuit, the first mediation output end of the control chip is connected with the second input end, the second mediation output end of the control chip is connected with the third input end, and the control end of the control chip is connected with the error amplification module.
4. The insulation resistance measurement device according to claim 3, wherein the error amplification module comprises a capacitor C33, a resistor R49 and a reference power source vref_3v, one end of the capacitor C33 is connected to the control terminal of the control chip, one end of the resistor R49 is connected to the other end of the capacitor C33, and the other end of the resistor R49 is connected to the reference power source vref_3v.
5. The insulation resistance measuring apparatus according to claim 3, wherein the output circuit includes a full-wave rectifying circuit connected to the push-pull transformer, and a filter circuit connected to the full-wave rectifying circuit, the full-wave rectifying circuit being connected to the current feedback circuit, the filter circuit being connected to the voltage feedback circuit.
6. The insulation resistance measurement device according to claim 3, wherein the voltage sampling measurement module comprises a voltage sampling circuit, a voltage following circuit, an absolute value amplifying circuit, a rectification processing circuit and a first ADC sampling circuit, the voltage sampling circuit is connected with one end of the voltage following circuit, the voltage sampling circuit is used for sampling voltages at two ends of the equipment to be measured, one end of the absolute value amplifying circuit is connected with the other end of the voltage following circuit, one end of the rectification processing circuit is connected with the other end of the absolute value amplifying circuit, one end of the first ADC sampling circuit is connected with the other end of the rectification processing circuit, and the other end of the first ADC sampling circuit is connected with the processing module.
7. The insulation resistance measurement device according to claim 6, wherein a port protection circuit is further provided between the sampling circuit and the device to be measured.
8. The insulation resistance measuring device according to claim 7, wherein the other end of the voltage follower circuit is further provided with a hysteresis comparator.
9. The insulation resistance measurement device according to claim 3, wherein the current sampling measurement module comprises a low-pass filter circuit, a gear switching circuit, a conversion circuit, a signal inverter and a second ADC sampling circuit, the first end of the low-pass filter circuit is connected to the device to be measured, the first end of the gear switching circuit is connected to the second end of the low-pass filter circuit, the first end of the conversion circuit is connected to the second end of the gear switching circuit, the second end of the conversion circuit is connected to the third end of the gear switching circuit, the first end of the signal inverter is connected to the second end of the conversion circuit, the first end of the second ADC sampling circuit is connected to the second end of the signal inverter, and the second end of the second ADC sampling circuit is connected to the processing module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322645907.0U CN221056549U (en) | 2023-09-27 | 2023-09-27 | Insulation resistance measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322645907.0U CN221056549U (en) | 2023-09-27 | 2023-09-27 | Insulation resistance measuring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN221056549U true CN221056549U (en) | 2024-05-31 |
Family
ID=91206021
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322645907.0U Active CN221056549U (en) | 2023-09-27 | 2023-09-27 | Insulation resistance measuring device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN221056549U (en) |
-
2023
- 2023-09-27 CN CN202322645907.0U patent/CN221056549U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| DE102015106195A1 (en) | Improved power factor correction | |
| CN204832381U (en) | Energy repayment formula is charged intellectual detection system and is overhauld a system | |
| DE102015113705A1 (en) | Mixed-mode power factor correction | |
| DE102013111386A1 (en) | Active Power Factor Corrector Circuit | |
| DE112020004571T5 (en) | WIRELESS POWER TRANSMISSION BASED ON TRANSMITTER COIL VOLTAGE MEASUREMENT | |
| CN109768693B (en) | Current sharing control method, device and system and computer readable storage medium | |
| CN109951925A (en) | Adjustable resistance and its current ripples of application eliminate circuit and line voltage compensation circuit | |
| US7352161B2 (en) | Burst-mode switching voltage regulator with ESR compensation | |
| US20170141684A1 (en) | Method and System for DC-DC Voltage Converters | |
| CN107168437B (en) | A kind of bipolar current source | |
| CN107037255B (en) | Voltage ripple detection circuit | |
| US7759964B2 (en) | Apparatus, system, and method determining voltage, current, and power in a switching regulator | |
| CN221056549U (en) | Insulation resistance measuring device | |
| CN211377899U (en) | PD power supply circuit and PD power supply unit based on PPS standard | |
| CN116582005B (en) | Electric energy conversion circuit, electric energy conversion method and electric energy conversion equipment | |
| CN211123004U (en) | Quick detection device of high-low voltage cabinet | |
| CN208723805U (en) | A kind of powersupply system | |
| CN220935031U (en) | DC high-voltage inverter | |
| CN117250403A (en) | Insulation resistance measuring device and method | |
| CN114846338A (en) | Voltage conversion circuit, voltage converter and electronic equipment | |
| CN103647447A (en) | Power supply device of communication module of electric energy meter | |
| CN215268079U (en) | Switching power supply parallel power supply system | |
| CN216351137U (en) | Power signal acquisition circuit | |
| CN104660027B (en) | Total harmonic distortion control circuit and method of current | |
| CN117277749A (en) | DC high-voltage inverter and inversion method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |