CN220064244U - Detection circuit and test equipment of leakage protector - Google Patents
Detection circuit and test equipment of leakage protector Download PDFInfo
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- CN220064244U CN220064244U CN202320604466.7U CN202320604466U CN220064244U CN 220064244 U CN220064244 U CN 220064244U CN 202320604466 U CN202320604466 U CN 202320604466U CN 220064244 U CN220064244 U CN 220064244U
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- 230000001012 protector Effects 0.000 title claims abstract description 123
- 238000012360 testing method Methods 0.000 title claims abstract description 84
- 238000001514 detection method Methods 0.000 title claims abstract description 65
- 238000002955 isolation Methods 0.000 claims abstract description 76
- 239000003990 capacitor Substances 0.000 claims description 41
- 238000001914 filtration Methods 0.000 claims description 20
- 230000005669 field effect Effects 0.000 claims description 5
- 238000005070 sampling Methods 0.000 claims description 4
- 238000012795 verification Methods 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 14
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Abstract
The utility model provides a detection circuit and test equipment of a leakage protector, wherein the circuit comprises: the control end of the first switch unit is used for receiving a control signal, and the first passage of the first switch unit is grounded; the first end of the isolation unit is used for being connected with a first power supply, the second end of the isolation unit is connected with the second path end of the first switch unit, the third end of the isolation unit is used for being connected with a second power supply, and the fourth end of the isolation unit is connected with a test input pin of the leakage protector; the first end of the voltage division unit is used for being connected with a test output pin of the leakage protector, and the second end of the voltage division unit is grounded. The first switch unit is conducted in response to the control signal so as to enable the isolation unit to work, further the conduction between the third end and the fourth end of the isolation unit is controlled, and a test signal with a preset current value is input to the leakage protector through the test input pin so as to test the leakage protector. The utility model aims to realize GFCI test and improve verification accuracy thereof.
Description
Technical Field
The utility model relates to the technical field of circuits, in particular to a detection circuit of a leakage protector and test equipment.
Background
Currently, in an operating circuit of an electronic device, it is necessary to use GFCI (Ground Fault Circuit Interrupter, ground fault current leakage protector) to protect against leakage current when there is leakage current in the circuit. In order to ensure that the GFCI will function properly during circuit operation, it is necessary to test the GFCI for functionality.
In the conventional GFCI testing process, the accuracy is usually checked, however, the current actually injected by the GFCI in the checking process is larger or smaller than the current theoretically required to be injected, which results in failure of the accuracy check of the GFCI. Therefore, how to implement GFCI test and improve verification accuracy thereof becomes a problem to be solved.
Disclosure of Invention
The utility model mainly aims to provide a detection circuit and a test device of a leakage protector, and aims to solve the technical problem that the current actually injected by a GFCI in the verification process is larger or smaller than the current theoretically required to be injected, so that the accuracy verification of the GFCI is failed.
In a first aspect, the present utility model provides a detection circuit of a leakage protector, the detection circuit comprising:
the control end of the first switch unit is used for receiving a control signal, and a first passage of the first switch unit is grounded;
the first end of the isolation unit is used for being connected with a first power supply, the second end of the isolation unit is connected with the second path end of the first switch unit, the third end of the isolation unit is used for being connected with a second power supply, and the fourth end of the isolation unit is connected with a test input pin of the leakage protector;
the first end of the voltage division unit is used for being connected with a test output pin of the leakage protector, and the second end of the voltage division unit is grounded;
the first switch unit is conducted in response to the control signal, so that the isolation unit works, conduction between the third end and the fourth end of the isolation unit is controlled, and a test signal with a preset current value is input to the leakage protector through the test input pin so as to test the leakage protector.
In an embodiment, the first switching unit includes: the control end of the switching tube is used as the control end of the first switching unit, the first end of the switching tube is used as the first passage end of the first switching unit, and the second end of the switching tube is used as the second passage end of the first switching unit; the first end of the first resistor is connected with the control end of the switching tube, and the second end of the first resistor is connected with the first end of the switching tube; and the first capacitor is connected with the first resistor in parallel.
In an embodiment, the first switching unit further comprises: and the first end of the second resistor is connected with the first end of the first resistor, and the second end of the second resistor is used for receiving the control signal.
In an embodiment, the isolation unit further comprises:
the first end of the isolation relay is used for being connected with the first power supply, the second end of the isolation relay is connected with the second path end of the first switch unit, the third end of the isolation relay is used for being connected with the second power supply, and the fourth end of the isolation relay is connected with the test input pin of the leakage protector;
and the first end of the third resistor is connected with the third end of the isolation relay, and the second end of the third resistor is used for being connected with the second power supply.
In an embodiment, the isolation unit further comprises: the first end of the second capacitor is used for being connected with the second power supply, and the second end of the second capacitor is grounded; and the third capacitor is connected with the second capacitor in parallel.
In an embodiment, the detection circuit further comprises: and the positive electrode of the discharge unit is connected with the second path end of the first switch unit, and the negative electrode of the discharge unit is used for being connected with the first power supply.
In an embodiment, the detection circuit further comprises: the first end of the filtering unit is used for being connected with the first power supply, and the second end of the filtering unit is grounded; the filtering unit is used for filtering the input of the first power supply.
In an embodiment, the detection circuit further comprises: the first input end of the comparison unit is connected with a leakage current sampling pin of the leakage protector, the second input end of the comparison unit is used for receiving the preset current value, and the output end of the comparison unit outputs a comparison signal; the comparison signal is used for indicating the effectiveness and the precision of the leakage protector.
In one embodiment, the switching transistor comprises a triode or a field effect transistor.
In a second aspect, an embodiment of the present utility model further provides a test apparatus, where the test apparatus includes the detection circuit of the leakage protector described in the foregoing embodiment.
The utility model provides a detection circuit and test equipment of a leakage protector, wherein the detection circuit is used for checking the precision of the leakage protector.
The leakage protector circuit provided by the utility model can be isolated through the isolation unit after the first switch unit is conducted, so that the current input to the leakage protector through the test input pin cannot leak to other positions, the current input to the leakage protector through the test input pin is ensured to be equal to the current which is required to be injected in theory, and the GFCI test is realized and the verification precision is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a detection circuit of a leakage protector according to a first embodiment of the present utility model;
fig. 2 is a schematic structural diagram of a detection circuit of a leakage protector according to a second embodiment of the present utility model;
FIG. 3 is a schematic diagram of a detection circuit of a leakage protector according to a third embodiment of the present utility model;
fig. 4 is a schematic circuit diagram of a detection circuit of a leakage protector according to an embodiment of the present utility model;
fig. 5 is a schematic circuit diagram of a leakage protector according to a first embodiment of the present utility model;
FIG. 6 is a schematic circuit diagram of a leakage protector according to a second embodiment of the present utility model;
fig. 7 is a schematic structural diagram of a test apparatus according to an embodiment of the present utility model.
The achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Some embodiments of the present utility model are described in detail below with reference to the accompanying drawings. The following embodiments and features of the embodiments may be combined with each other without conflict.
Referring to fig. 1, fig. 1 is a schematic diagram of a detection circuit of a leakage protector according to a first embodiment of the present utility model.
As shown in fig. 1, the earth leakage protector detection circuit 100 is capable of testing the earth leakage protector 30. The detection circuit 100 of the leakage protector includes a first switching unit 10, an isolation unit 20, and a voltage division unit 40.
The control end of the first switch unit 10 is used for receiving a control signal output by the controller, and a first access point of the first switch unit 10 is grounded; the first end of the isolation unit 20 is used for being connected with a first power supply V1, the second end of the isolation unit 20 is connected with the second path end of the first switch unit 10, the third end of the isolation unit 20 is used for being connected with a second power supply V2, and the fourth end of the isolation unit 20 is connected with a Test input pin Test in of the leakage protector 30; the first end of the voltage dividing unit 40 is used for being connected with a Test output pin Test out of the leakage protector 30, and the second end of the voltage dividing unit 40 is grounded.
Further, the first switch unit 10 is turned on in response to the control signal, so that the isolation unit 20 is operated, and the third terminal and the fourth terminal of the isolation unit 20 are controlled to be turned on, and a Test signal with a preset current value is input to the leakage protector 30 through the Test input pin Test in, so as to Test the leakage protector 30.
The preset current value is not limited to this, and may be, for example, 5A, 10A, or the like.
It can be understood that the control signal can control the first switch unit 10 to be turned on, so that the isolation unit 20 works to achieve the isolation effect of the isolation unit 20, thereby ensuring that the current injected into the leakage protector 30 through the Test input pin Test in is a preset current value. The magnitude of the current is only related to the impedance of the second power supply V2 and the detection circuit 100 of the leakage protector, but the leakage current is not a problem, so that the leakage protector 30 can be accurately tested.
In the embodiment of the present utility model, the first switch unit 10 can be turned on in response to a control signal to make the isolation unit 20 work, so as to control the conduction between the third end and the fourth end of the isolation unit 20, and a Test signal with a preset current value is input to the leakage protector 30 through the Test input pin Test in to Test the leakage protector 30.
In this embodiment, after the first switch unit 10 is turned on, the detection circuit 100 of the leakage protector isolates the first switch unit 10 from the leakage protector 30 through the isolation unit 20, so that the leakage current of the first switch unit 10 is prevented from flowing into or affecting the leakage protector, and therefore, the current input to the leakage protector 30 through the Test input pin Test in is ensured to be a fixed current, so that the problem of leakage current of the leakage protector 30 is avoided, and the accuracy of the leakage protector 30 can be checked relatively accurately.
Optionally, referring to fig. 2, fig. 2 is a schematic structural diagram of a detection circuit of a leakage protector according to a second embodiment of the present utility model. As shown in fig. 2, the leakage protector detection circuit 100 also includes a bleed unit 50.
Wherein the positive pole of the bleed unit 50 is connected to the second path end of the first switch unit 10 and the negative pole of the bleed unit 30 is connected to the first power supply V1.
It will be appreciated that the bleed unit 50 is capable of providing a bleed path for the leakage protector detection circuit 100, so that charge stored in the leakage protector detection circuit 100 can be quickly discharged through the bleed path, thereby ensuring that the leakage protector detection circuit 100 can operate normally and improving the stability of the circuit.
Optionally, as shown in fig. 2, the detection circuit 100 of the leakage protector further includes a filtering unit 60. Wherein, the first end of the filtering unit 60 is used for connecting with the first power supply V1, and the second end of the filtering unit 60 is grounded; the filtering unit 60 is configured to perform a filtering process on a first voltage provided by the first power source V1.
It can be appreciated that after the filtering unit 60 performs the filtering process on the first voltage provided by the first power supply V1, the current of the detection circuit 100 of the leakage protector can be more stable, and the interference caused by the noise of the detection circuit 100 of the leakage protector can be effectively reduced.
Optionally, referring to fig. 3, fig. 3 is a schematic structural diagram of a detection circuit of a leakage protector according to a third embodiment of the present utility model. As shown in fig. 3, the detection circuit 100 of the leakage protector further includes a comparison unit 70.
The first input end of the comparing unit 70 is connected to the leakage current sampling pin of the leakage protector 30, the second input end of the comparing unit 70 is used for receiving a preset current value, and the output end of the comparing unit 70 outputs a comparison signal.
It will be appreciated that the comparison signal can be used to indicate the validity as well as the accuracy of the earth leakage protector 30. Specifically, if the comparison unit 70 can output the comparison signal, it is explained that the earth leakage protector 30 is active. Further, the comparison signal value output by the comparison unit 70 may be compared with a standard comparison signal value to obtain an actual deviation value, and whether the actual deviation value is within a preset deviation range may be confirmed. If the actual deviation value is within the preset deviation range, it indicates that the accuracy of the leakage protector 30 meets the requirement, otherwise, the accuracy does not meet the requirement. In addition, a correction amount may be generated according to the actual deviation value to verify the accuracy of the earth leakage protector 30, so that the accuracy of the earth leakage protector 30 is improved.
The present utility model is not limited to the above-described preset deviation range, and may be, for example, 5% or 10%, and the present utility model is described by taking the preset deviation range of 5% as an example. Specifically, when the actual deviation value is within 5%, it is indicated that the accuracy of the earth leakage protector 30 meets the requirement.
In an embodiment of the present utility model, the detection circuit 100 of the leakage protector further includes a comparison unit 70. Wherein the comparing unit 70 can be connected to the leakage protector 30, and output a comparison signal according to the preset current value and the preset current value provided by the isolating unit 20 after receiving the preset current value. Further, determining the validity and accuracy of the earth leakage protector 30 may also be implemented based on the comparison signal, thereby detecting the state of the earth leakage protector 30.
With continued reference to fig. 4, fig. 4 is a schematic circuit diagram of a detection circuit of a leakage protector according to an embodiment of the utility model. As shown in fig. 4, the first switching unit 10 includes a switching tube, a first resistor R1, and a first capacitor C1.
Wherein, the control end of the switching tube is used as the control end of the first switching unit 10, the first end of the switching tube is used as the first path end of the first switching unit 10, and the second end of the switching tube is used as the second path end of the first switching unit 10; the first end of the first resistor R1 is connected with the control end of the switching tube, and the second end of the first resistor R1 is connected with the first end of the switching tube; the first capacitor C1 is connected in parallel with the first resistor R1.
It should be noted that the present utility model is not limited to the type of the switching transistor, and for example, the switching transistor may be a triode or a field effect transistor.
Optionally, the switch tube is a triode or a field effect tube. It can be understood that the triode or the field effect transistor not only has the function of a switch, but also can amplify a weak electric signal into an electric signal with a larger amplitude value, namely, the function of a method signal is realized.
The number of the first resistors R1 is not limited, and for example, the number of the first resistors R1 is 1, 2, or the like. Further, the first resistor R1 may be connected in parallel with the first capacitor C1 to realize the filtering effect.
In the embodiment of the present utility model, the control signal can control the switch tube to be turned on after being filtered by the first resistor R1 and the first capacitor C1, so that the isolation unit 20 works. In addition, the interference of other noises in the detection circuit 100 of the leakage protector can be reduced by the first resistor R1 and the first capacitor C1.
Optionally, as shown in fig. 4, the first switch unit 10 further includes a second resistor R2, a first end of the second resistor R2 is connected to a first end of the first resistor R1, and a second end of the second resistor R2 is configured to receive the control signal.
It can be appreciated that the second resistor R2 can limit the current of the detection circuit 100 of the leakage protector, thereby protecting other devices.
It can be appreciated that the relay can expand the control range of the detection circuit 100 of the earth leakage protector. Specifically, when the control signal received by the relay reaches a certain value, the multi-path circuit can be switched on, off and on according to different forms of the contact group.
Optionally, referring to fig. 4, the isolation unit 20 further includes an isolation relay K1. The first end of the isolation relay K1 is used for being connected with the first power supply V1, the second end of the isolation relay K1 is connected with the second path end of the first switch unit 10, the third end of the isolation relay K1 is used for being connected with the second power supply V2, and the fourth end of the isolation relay K1 is connected with a Test input pin Test in of the leakage protector. The isolation unit 20 further includes a third resistor R3, a first end of the third resistor R3 is connected to a third end of the isolation relay K1, and a second end of the third resistor R3 is connected to the second power source V2.
In addition, the isolation relay K1 is not limited in the present utility model, and for example, the isolation relay K1 may be an optocoupler isolation relay, etc., and the present utility model is described taking the isolation relay K1 as an optocoupler isolation relay as an example.
It can be appreciated that the third resistor R3 can limit the current of the detection circuit 100 of the leakage protector, thereby protecting other devices. Optionally, as shown in fig. 4, the isolation unit 20 further includes a second capacitor C2 and a third capacitor C3. The first end of the second capacitor C2 is used for being connected with the second power supply V2, and the second end of the second capacitor C2 is grounded; the third capacitor C3 is connected in parallel with the second capacitor C2.
It can be appreciated that the second capacitor C2 and the third capacitor C3 have a filtering effect, so that interference of other noises in the detection circuit 100 of the leakage protector can be reduced through the second capacitor C2 and the third capacitor C3.
In the above embodiment, the second voltage provided by the second power supply V2 can be filtered by the second capacitor C2 and the third capacitor C3 and the current is limited by the third resistor R3, and after the relay is turned on, a Test signal with a preset current value is input to the leakage protector 30 through the Test input pin Test in, so as to Test the leakage protector 30.
In one embodiment, the second voltage provided by the second power supply V2 is 5V.
Optionally, as shown in fig. 4, the filtering unit 60 includes a fourth capacitor C4, a first end of the fourth capacitor C4 is used for being connected to the first power source V1, and a second end of the fourth capacitor C4 is grounded; the fourth capacitor C4 is configured to perform a filtering process on the first voltage provided by the first power source V1.
Alternatively, as shown in fig. 4, the drain unit 50 may be a diode, the anode a of which is connected to the second path terminal of the first switching unit 10, and the cathode K of which is connected to the first power source V1.
It can be appreciated that the diode can provide a bleed path for the detection circuit 100 of the leakage protector, so that charges stored in the detection circuit 100 of the leakage protector can be quickly discharged through the bleed path, so as to ensure that the detection circuit 100 of the leakage protector can work normally, and improve the stability of the circuit.
Alternatively, as shown in fig. 4, the voltage dividing unit 40 includes a fourth resistor R4. The first end of the fourth resistor R4 is connected to the Test output pin Test out of the leakage protector 30, and the second end of the fourth resistor R4 is grounded.
Note that, the number of the fourth resistors R4 may be 1, 2, or the like, and when the number of the fourth resistors R4 is plural, the plural fourth resistors R4 may be connected in parallel or in series, which is not limited in the present utility model. It can be appreciated that other devices in the detection circuit 100 of the leakage protector can be effectively protected by the voltage division effect of the fourth resistor R4.
Alternatively, as shown in fig. 4, the comparison unit 70 includes a comparator. Wherein, positive pole input terminal + of comparator connects leakage current sampling pin of leakage protector 30, and negative pole input terminal-of comparator connects preset current value, and the output of comparator outputs the comparison signal. Further, the comparison signal is used to indicate the validity and accuracy of the earth leakage protector 30.
It should be noted that the present utility model is not limited to the type of the comparator, and may include a voltage comparator, a hysteresis comparator, and the like, for example.
In an embodiment of the present utility model, the comparison unit 70 includes a comparator. The comparator can be connected with the leakage protector 30 and a preset current value respectively to output a comparison signal. Further, determining the validity and accuracy of the earth leakage protector 30 may also be implemented based on the comparison signal, thereby detecting the state of the earth leakage protector 30.
With continued reference to fig. 5, fig. 5 is a schematic circuit diagram of a leakage protector according to a first embodiment of the present utility model. As shown in fig. 5, the leakage protector 30 can input a preset current value through the Test input pin Test in and output the preset current value through the Test output pin Test out, so as to Test the leakage protector 30.
Optionally, referring to fig. 6, fig. 6 is a schematic circuit diagram of a leakage protector according to a second embodiment of the present utility model. As shown in fig. 6, the detection circuit 100 of the leakage protector further includes a fifth capacitor C5 and a sixth capacitor C6 connected in parallel. One end of the sixth capacitor C6 and one end of the fifth capacitor C5 are connected to the third power supply V3, and the other end of the sixth capacitor C6 and the other end of the fifth capacitor C5 are grounded.
In one embodiment, the third power supply V3 is used to provide a voltage of 5V.
It can be appreciated that the sixth capacitor C6 and the fifth capacitor C5 have filtering effects, so that interference of other noises in the detection circuit 100 of the leakage protector can be reduced through the sixth capacitor C6 and the fifth capacitor C5.
The detection circuit 100 of the leakage protector of the above embodiment can be used to verify the accuracy of the leakage protector 30. The detection circuit 100 of the leakage protector comprises a first switch unit 10, an isolation unit 20 and a voltage division unit 40, wherein a control end of the first switch unit 10 is used for receiving a control signal, and a first path of the first switch unit 10 is grounded. The first end of the isolation unit 20 is used for being connected with the first power supply V1, the second end of the isolation unit 20 is connected with the second path end of the first switch unit 10, the third end of the isolation unit 20 is used for being connected with the second power supply V2, and the fourth end of the isolation unit 20 is connected with the Test input pin Test in of the leakage protector 30. The first end of the voltage division unit 40 is used for being connected with a Test output pin Test out of the leakage protector 30, the second end of the voltage division unit 40 is grounded, further, the first switch unit 10 is turned on in response to a control signal, so that the isolation unit 20 works, and further, conduction between the third end and the fourth end of the isolation unit 20 is controlled, a Test signal with a preset current value is input to the leakage protector 30 through the Test input pin Test in, and the leakage protector 30 is tested. The detection circuit 100 of the leakage protector provided by the utility model can continue to isolate through the isolation unit 20 after the first switch unit 10 is conducted, so that the current input to the leakage protector 30 through the Test input pin Test in is ensured to be a fixed current, the problem of leakage current of the leakage protector 30 is avoided, and the accuracy of the leakage protector 30 can be accurately checked.
Referring to fig. 7, fig. 7 is a schematic structural diagram of a test apparatus according to an embodiment of the utility model.
As shown in fig. 7, the test apparatus 200 includes a detection circuit 100 of a leakage protector, and the detection circuit 100 of the leakage protector is used for testing the leakage protector.
The detection circuit 100 of the leakage protector includes the first switch unit 10, the isolation unit 20, and the voltage division unit 40 described in the above embodiments.
The control end of the first switch unit 10 is used for receiving a control signal output by the controller, and a first access point of the first switch unit 10 is grounded; the first end of the isolation unit 20 is used for being connected with a first power supply 21, the second end of the isolation unit 20 is connected with the second path end of the first switch unit 10, the third end of the isolation unit 20 is used for being connected with a second power supply 22, and the fourth end of the isolation unit 20 is connected with a Test input pin Test in of the leakage protector 30; the first end of the voltage dividing unit 40 is used for being connected with a Test output pin Test out of the leakage protector 30, and the second end of the voltage dividing unit 40 is grounded.
Further, the first switch unit 10 is turned on in response to the control signal, so that the isolation unit 20 is operated, and the third terminal and the fourth terminal of the isolation unit 20 are controlled to be turned on, and a Test signal with a preset current value is input to the leakage protector 30 through the Test input pin Test in, so as to Test the leakage protector 30.
In the description of the present utility model, it should be noted that the terms "mounted," "connected," and "coupled" are to be construed broadly, as well as, for example, fixedly coupled, detachably coupled, or integrally coupled, unless otherwise specifically indicated and defined. Either mechanically or electrically. Can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
The above disclosure provides many different embodiments, or examples, for implementing different structures of the utility model. The foregoing description of specific example components and arrangements has been presented to simplify the present disclosure. They are, of course, merely examples and are not intended to limit the utility model. Furthermore, the present utility model may repeat reference numerals and/or letters in the various examples, which are for the purpose of brevity and clarity, and which do not themselves indicate the relationship between the various embodiments and/or arrangements discussed. In addition, the present utility model provides examples of various specific processes and materials, but one of ordinary skill in the art will recognize the application of other processes and/or the use of other materials.
In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above embodiments are only preferred embodiments of the present utility model, and the scope of the present utility model is not limited thereto, but any insubstantial changes and substitutions made by those skilled in the art on the basis of the present utility model are intended to be within the scope of the present utility model as claimed.
Claims (10)
1. A detection circuit of a leakage protector, the detection circuit comprising:
the control end of the first switch unit is used for receiving a control signal, and a first passage of the first switch unit is grounded;
the first end of the isolation unit is used for being connected with a first power supply, the second end of the isolation unit is connected with the second path end of the first switch unit, the third end of the isolation unit is used for being connected with a second power supply, and the fourth end of the isolation unit is connected with a test input pin of the leakage protector;
the first end of the voltage division unit is used for being connected with a test output pin of the leakage protector, and the second end of the voltage division unit is grounded;
the first switch unit is conducted in response to the control signal, so that the isolation unit works, conduction between the third end and the fourth end of the isolation unit is controlled, and a test signal with a preset current value is input to the leakage protector through the test input pin so as to test the leakage protector.
2. The detection circuit of claim 1, wherein the first switching unit comprises:
the control end of the switching tube is used as the control end of the first switching unit, the first end of the switching tube is used as the first passage end of the first switching unit, and the second end of the switching tube is used as the second passage end of the first switching unit;
the first end of the first resistor is connected with the control end of the switching tube, and the second end of the first resistor is connected with the first end of the switching tube;
and the first capacitor is connected with the first resistor in parallel.
3. The detection circuit of claim 2, wherein the first switching unit further comprises:
and the first end of the second resistor is connected with the first end of the first resistor, and the second end of the second resistor is used for receiving the control signal.
4. The detection circuit of claim 1, wherein the isolation unit comprises:
the first end of the isolation relay is used for being connected with the first power supply, the second end of the isolation relay is connected with the second path end of the first switch unit, the third end of the isolation relay is used for being connected with the second power supply, and the fourth end of the isolation relay is connected with the test input pin of the leakage protector;
and the first end of the third resistor is connected with the third end of the isolation relay, and the second end of the third resistor is used for being connected with the second power supply.
5. The detection circuit of claim 4, wherein the isolation unit further comprises:
the first end of the second capacitor is used for being connected with the second power supply, and the second end of the second capacitor is grounded;
and the third capacitor is connected with the second capacitor in parallel.
6. The detection circuit of claim 1, wherein the detection circuit further comprises:
and the positive electrode of the discharge unit is connected with the second path end of the first switch unit, and the negative electrode of the discharge unit is used for being connected with the first power supply.
7. The detection circuit of claim 1, wherein the detection circuit further comprises:
the first end of the filtering unit is used for being connected with the first power supply, and the second end of the filtering unit is grounded; the filtering unit is used for filtering the input of the first power supply.
8. The detection circuit of claim 1, wherein the detection circuit further comprises:
the first input end of the comparison unit is connected with a leakage current sampling pin of the leakage protector, the second input end of the comparison unit is used for receiving the preset current value, and the output end of the comparison unit outputs a comparison signal; the comparison signal is used for indicating the effectiveness and the precision of the leakage protector.
9. The detection circuit of claim 2, wherein the switching tube comprises a triode or a field effect tube.
10. A test apparatus comprising a detection circuit of a leakage protector according to any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320604466.7U CN220064244U (en) | 2023-03-23 | 2023-03-23 | Detection circuit and test equipment of leakage protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320604466.7U CN220064244U (en) | 2023-03-23 | 2023-03-23 | Detection circuit and test equipment of leakage protector |
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Address after: 518000 Factory Building 401, Runheng Industrial Plant 1, Fuyuan Road, Zhancheng Community, Fuhai Street, Bao'an District, Shenzhen City, Guangdong Province Patentee after: Shenzhen Zhenghao Innovation Technology Co.,Ltd. Country or region after: China Address before: 518000, 1st Floor, Building E, Jiehe Industrial City, Shuitian Community, Shiyan Street, Bao'an District, Shenzhen City, Guangdong Province Patentee before: Shenzhen Zhenghao Innovation Technology Co.,Ltd. Country or region before: China |