CN204142883U - Electric leakage detection circuit and electric leakage detection tool - Google Patents
Electric leakage detection circuit and electric leakage detection tool Download PDFInfo
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- CN204142883U CN204142883U CN201420662696.XU CN201420662696U CN204142883U CN 204142883 U CN204142883 U CN 204142883U CN 201420662696 U CN201420662696 U CN 201420662696U CN 204142883 U CN204142883 U CN 204142883U
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- 238000001514 detection method Methods 0.000 title claims abstract description 56
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 10
- 238000010586 diagram Methods 0.000 description 6
- 229910052742 iron Inorganic materials 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 239000004831 Hot glue Substances 0.000 description 3
- 239000003292 glue Substances 0.000 description 2
- 239000012943 hotmelt Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005476 soldering Methods 0.000 description 2
- 229920001342 Bakelite® Polymers 0.000 description 1
- 239000004637 bakelite Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
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- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The utility model discloses an electric leakage detection circuit and electric leakage detection frock, include: the test circuit is used for outputting a high-level signal when judging that the leakage voltage of the device to be tested is greater than the reference voltage; the voltage division circuit is used for dividing the high-level signal and inputting the high-level signal to the control switch circuit; the control switch circuit is used for amplifying the input current and controlling the switch circuit to be conducted; the switch circuit is used for controlling the connection between the second end and the grounding end; and a first alarm circuit for issuing an alarm. According to the above, in the technical scheme provided by the utility model, carry out the comparison through test circuit to the leakage voltage of device under test and reference voltage, when leakage voltage is greater than reference voltage, output high level signal to carry out follow-up control to this high level signal, send out the police dispatch newspaper with control first alarm circuit, the suggestion staff this device under test has the condition of electric leakage, so that the staff in time handles this device under test.
Description
Technical Field
The utility model relates to an electric leakage detection technical field, more specifically the theory that says so relates to an electric leakage detection circuit and electric leakage detection frock.
Background
Most of the existing electronic devices include a circuit board. In the integrated manufacturing process of the circuit board and the circuit device, tools such as an electric soldering iron, a hot melt glue gun, a wind screwdriver and an electric screwdriver are often used, but the electric soldering iron, the hot melt glue gun, the wind screwdriver and the electric screwdriver often have electric leakage, so that in the process of the integrated circuit board and the circuit device, the failure of the circuit device due to electric leakage often occurs, and the yield is reduced. Based on the situation, an electric leakage detection tool is needed to frequently carry out electric leakage detection on the tools so as to avoid the situation that circuit devices fail due to electric leakage.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides an electric leakage detection circuit and electric leakage detection frock to whether the condition that detects tools such as electric iron, hot melt adhesive rifle, wind criticize, electric criticize has the electric leakage, avoids appearing because the electric leakage causes the condition that the circuit device became invalid.
In order to achieve the above purpose, the utility model provides a technical scheme as follows:
a leakage detection circuit, comprising:
the device comprises a test circuit, a voltage division circuit, a control switch circuit, a switch circuit and a first alarm circuit; wherein,
the test circuit is used for outputting a high level signal when judging that the leakage voltage of the device to be tested is greater than the reference voltage, the first input end of the test circuit is connected to the reference voltage, the second input end of the test circuit is connected to the device to be tested, and the output end of the test circuit is connected to the input end of the voltage division circuit;
the voltage division circuit is used for dividing the high level signal and inputting the high level signal to the control switch circuit, a first output end of the voltage division circuit is connected to a first end of the control switch circuit, and a second output end of the voltage division circuit is connected to a ground end;
the control switch circuit is used for amplifying input current and controlling the switch circuit to be conducted, a second end of the control switch circuit is connected to a first end of the switch circuit and a first power supply, and a third end of the control switch circuit is connected to the grounding end;
the switch circuit is used for controlling the second end of the switch circuit to be communicated with the grounding end, the second end of the switch circuit is connected to the output end of the first alarm circuit, the third end of the switch circuit is connected to the grounding end, and the input end of the first alarm circuit is connected to the first power supply.
Preferably, the test circuit comprises an operational amplifier and a diode, wherein,
the inverting terminal of the operational amplifier is connected to the reference voltage, the non-inverting terminal of the operational amplifier is connected to the device to be tested, the output terminal of the operational amplifier is connected to the anode of the diode, and the cathode of the diode is connected to the input terminal of the voltage division circuit.
Preferably, the voltage dividing circuit includes a first resistor and a second resistor, wherein,
the first end of the first resistor is connected to the output end of the test circuit, the second end of the first resistor is connected to the first end of the second resistor and the first end of the control switch circuit, and the second end of the second resistor is connected to the ground end.
Preferably, the control switch circuit includes a first transistor and a third resistor, wherein,
the base electrode of the first triode is connected to the first output end of the voltage division circuit, the collector electrode of the first triode is connected to the first end of the third resistor, the emitter electrode of the first triode is connected to the ground terminal, and the second end of the third resistor is connected to the first end of the switch circuit and the first power supply.
Preferably, the switching circuit includes a second transistor and a fourth resistor, wherein,
the first end of the fourth resistor is connected to the second end of the control switch circuit and the first power supply, the second end of the fourth resistor is connected to the base electrode of the second triode, the collector electrode of the second triode is connected to the output end of the first alarm circuit, and the emitter electrode of the second triode is connected to the grounding end.
Preferably, the first alarm circuit comprises a light emitting diode and a fifth resistor, wherein,
the anode of the light emitting diode is connected to the first power supply, the cathode of the light emitting diode is connected to the first end of the fifth resistor, and the second end of the fifth resistor is connected to the second end of the switch circuit.
Preferably, the leakage detection circuit further includes: a second alarm circuit, wherein,
the input end of the second alarm circuit is connected to a second power supply, and the output end of the second alarm circuit is connected to the second end of the switch circuit.
Preferably, the second alarm circuit includes: an alarm, wherein,
the input end of the alarm is connected to the second power supply, and the output end of the alarm is connected to the second end of the switch circuit.
Preferably, the alarm is an audible alarm.
An electric leakage detection tool comprises the electric leakage detection circuit.
Compared with the prior art, the utility model provides a technical scheme has following advantage at least:
the utility model provides an electric leakage detection circuitry and electric leakage detection frock, include: the device comprises a test circuit, a voltage division circuit, a control switch circuit, a switch circuit and a first alarm circuit; the test circuit is used for outputting a high level signal when judging that the leakage voltage of the device to be tested is greater than the reference voltage, the first input end of the test circuit is connected to the reference voltage, the second input end of the test circuit is connected to the device to be tested, and the output end of the test circuit is connected to the input end of the voltage division circuit; the voltage division circuit is used for dividing the high level signal and inputting the high level signal to the control switch circuit, a first output end of the voltage division circuit is connected to a first end of the control switch circuit, and a second output end of the voltage division circuit is connected to a ground end; the control switch circuit is used for amplifying input current and controlling the switch circuit to be conducted, a second end of the control switch circuit is connected to a first end of the switch circuit and a first power supply, and a third end of the control switch circuit is connected to the grounding end; the switch circuit is used for controlling the second end of the switch circuit to be communicated with the grounding end, the second end of the switch circuit is connected to the output end of the first alarm circuit, the third end of the switch circuit is connected to the grounding end, and the input end of the first alarm circuit is connected to the first power supply.
According to the above, in the technical scheme provided by the utility model, carry out the comparison through test circuit to the leakage voltage of device under test and reference voltage, when leakage voltage is greater than reference voltage, output high level signal to carry out follow-up control to this high level signal, send out the police dispatch newspaper with control first alarm circuit, the suggestion staff this device under test has the condition of electric leakage, so that the staff in time handles this device under test.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a leakage detection circuit according to an embodiment of the present disclosure;
fig. 2 is a structural diagram of another leakage detection circuit according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of another leakage detection circuit according to an embodiment of the present disclosure.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
As described in the background art, in the integrated manufacturing process of the circuit board and the circuit device, tools such as an electric iron, a hot melt adhesive gun, a pneumatic screwdriver, an electric screwdriver and the like are often used, but the electric leakage of the tools such as the electric iron, the hot melt adhesive gun, the pneumatic screwdriver, the electric screwdriver and the like often occurs, so that in the process of the integrated circuit board and the circuit device, the failure of the circuit device due to the electric leakage often occurs, and the yield is reduced. Based on the situation, an electric leakage detection tool is needed to frequently carry out electric leakage detection on the tools so as to avoid the situation that circuit devices fail due to electric leakage.
Accordingly, the embodiment of the present application provides a leakage detection circuit, which is described in detail with reference to fig. 1 to 3.
Referring to fig. 1, a schematic structural diagram of a leakage detection circuit provided in an embodiment of the present application is shown, where the leakage detection circuit provided in the embodiment of the present application includes:
the device comprises a test circuit 1, a voltage division circuit 2, a control switch circuit 3, a switch circuit 4 and a first alarm circuit 5; wherein,
the test circuit 1 is used for outputting a high level signal when judging that the leakage voltage of the device to be tested is greater than the reference voltage, the first input end of the test circuit 1 is connected to the reference voltage V1, the second input end of the test circuit 1 is connected to the device to be tested, and the output end of the test circuit is connected to the input end of the voltage division circuit;
the voltage division circuit 2 is used for dividing a high level signal and inputting the high level signal to the control switch circuit 3, a first output end of the voltage division circuit 2 is connected to a first end of the control switch circuit 3, and a second output end of the voltage division circuit 2 is connected to a ground end;
the control switch circuit 3 is used for amplifying the input current and controlling the switch circuit 4 to be conducted, the second end of the control switch circuit 3 is connected to the first end of the switch circuit 4 and the first power supply V2, and the third end of the control switch circuit 3 is connected to the ground end;
the switch circuit 4 is used for controlling the second end to be communicated with the ground end, the second end of the switch circuit 4 is connected to the output end of the first alarm circuit 5, the third end of the switch circuit 4 is connected to the ground end, and the input end of the first alarm circuit 5 is connected to the first power supply V2.
According to the above, the leakage voltage of the device to be tested is compared with the reference voltage through the test circuit, when the leakage voltage is greater than the reference voltage, a high level signal is output, and the high level signal is subsequently controlled to control the first alarm circuit to give an alarm to prompt a worker that the device to be tested has the leakage condition, so that the worker can timely process the device to be tested.
Specifically, for describing the leakage detection circuit provided in the embodiment of the present application in detail, reference is made to fig. 2, which is a schematic structural diagram of another leakage detection circuit provided in the embodiment of the present application, wherein,
the test circuit 1 provided by the embodiment of the present application includes an operational amplifier U and a diode D1, wherein,
the inverting terminal of the operational amplifier U is connected to the reference voltage V1, the non-inverting terminal of the operational amplifier U is connected to the device under test, the output terminal of the operational amplifier U is connected to the anode of the diode D1, and the cathode of the diode D1 is connected to the input terminal of the voltage divider circuit 2. Optionally, the operational amplifier U may be replaced by an LM358P chip, in which a first pin of the LM358P chip is connected to an anode of a diode, a second pin is connected to a reference voltage, a third pin is connected to a device under test, a fourth pin is connected to a ground terminal, and an eighth pin is connected to a power supply.
The voltage divider circuit 2 provided by the embodiment of the present application includes a first resistor R1 and a second resistor R2, wherein,
the first terminal of the first resistor R1 is connected to the output terminal of the test circuit 1, the second terminal of the first resistor R1 is connected to the first terminal of the second resistor R2 and the first terminal of the control switch circuit 3, and the second terminal of the second resistor R2 is connected to the ground terminal.
The control switch circuit 3 provided by the embodiment of the present application includes a first transistor Q1 and a third resistor R3, wherein,
a base of the first transistor Q1 is connected to the first output terminal of the voltage divider circuit 2, a collector of the first transistor Q1 is connected to a first terminal of the third resistor R3, an emitter of the first transistor Q1 is connected to a ground terminal, and a second terminal of the third resistor R3 is connected to a first terminal of the switch circuit 4 and the first power supply.
The switching circuit 4 provided by the embodiment of the present application includes a second transistor Q2 and a fourth resistor R4, wherein,
a first end of the fourth resistor R4 is connected to the second end of the control switch circuit 3 and the first power supply V2, a second end of the fourth resistor R4 is connected to a base of the second triode Q2, a collector of the second triode Q2 is connected to the output end of the first alarm circuit 5, and an emitter of the second triode Q2 is connected to the ground end.
And, the first alarm circuit 5 provided by the embodiment of the present application includes a light emitting diode D2 and a fifth resistor R5, wherein,
an anode of the light emitting diode D2 is connected to the first power source V2, a cathode of the light emitting diode D2 is connected to a first terminal of the fifth resistor R5, and a second terminal of the fifth resistor R5 is connected to a second terminal of the switch circuit 4.
In addition, in order to adapt to different devices to be tested, the reference voltage provided in the embodiments of the present application is preferably an adjustable reference voltage, that is, the magnitude of the reference voltage can be adjusted by connecting the input power supply with the variable resistor.
As can be seen from the leakage detection circuit corresponding to fig. 2, the test circuit compares the leakage voltage of the device to be tested input to the operational amplifier with the reference voltage, when the leakage voltage is greater than the reference voltage, the operational amplifier outputs a high level signal, and the high level signal passes through the diode and is input to the voltage divider circuit; the voltage division circuit divides the high level signal and inputs a certain current to the control switch circuit; a first triode of the control switch circuit amplifies the input current and inputs the current to the switch circuit; the second triode of the switch circuit works in a saturation region through the control of amplified current, so that the collector electrode and the emitter electrode of the second triode are conducted, a current loop is formed among the first power supply, the first alarm circuit, the second triode and the grounding end, the first alarm circuit is electrified to send out an alarm (namely, the light emitting diode emits light), and a worker can conveniently process the device to be tested of electric leakage.
Further, based on the leakage detection circuit corresponding to fig. 1, in order to enhance the alarm function of the leakage detection circuit, the leakage detection circuit provided in the embodiment of the present application may be further optimized. Referring to fig. 3, a schematic structural diagram of another leakage detection circuit provided in the embodiment of the present application is shown, where the leakage detection circuit further includes: a second alarm circuit 6, wherein,
the input end of the second alarm circuit 6 is connected to the second power supply V3, and the output end of the second alarm circuit 6 is connected to the second end of the switch circuit 4. Preferably, the second alarm circuit includes: and the input end of the alarm is connected to the second power supply, and the output end of the alarm is connected to the second end of the switch circuit. Furthermore, the alarm is an audible alarm.
The electric leakage detection circuit corresponding to the electric leakage detection circuit shown in fig. 3 can give an alarm through various alarms, so that the alarm capacity of the electric leakage detection circuit is improved, workers can be prompted more clearly and visually, and the omission caused by negligence of the workers is avoided.
Correspondingly, this application embodiment still provides an electric leakage detection frock, and wherein, electric leakage detection frock includes the electric leakage detection circuit that any one above-mentioned embodiment provided.
Optionally, the leakage detection circuit is integrated on a printed circuit board, and then the printed circuit board is encapsulated by an insulating housing. According to practical application, if the alarm circuit comprises a light-emitting diode, a sound alarm and other devices, the installation area can be correspondingly arranged on the insulating shell so as to observe the alarm device.
In addition, for the insulating housing in the electric leakage detection tool provided in the embodiment of the present application, the material thereof is not particularly limited, and may be bakelite or other materials.
The electric leakage detection circuit and electric leakage detection frock that this application embodiment provided include: the device comprises a test circuit, a voltage division circuit, a control switch circuit, a switch circuit and a first alarm circuit; the test circuit is used for outputting a high level signal when judging that the leakage voltage of the device to be tested is greater than the reference voltage, the first input end of the test circuit is connected to the reference voltage, the second input end of the test circuit is connected to the device to be tested, and the output end of the test circuit is connected to the input end of the voltage division circuit; the voltage division circuit is used for dividing the high level signal and inputting the high level signal to the control switch circuit, a first output end of the voltage division circuit is connected to a first end of the control switch circuit, and a second output end of the voltage division circuit is connected to a ground end; the control switch circuit is used for amplifying input current and controlling the switch circuit to be conducted, a second end of the control switch circuit is connected to a first end of the switch circuit and a first power supply, and a third end of the control switch circuit is connected to the grounding end; the switch circuit is used for controlling the second end of the switch circuit to be communicated with the grounding end, the second end of the switch circuit is connected to the output end of the first alarm circuit, the third end of the switch circuit is connected to the grounding end, and the input end of the first alarm circuit is connected to the first power supply.
As can be seen from the above, in the technical solution provided in the embodiment of the present application, the leakage voltage of the device under test is compared with the reference voltage through the test circuit, and when the leakage voltage is greater than the reference voltage, a high level signal is output and is subsequently controlled to control the first alarm circuit to send an alarm to prompt a worker that the device under test has a leakage condition, so that the worker can timely process the device under test.
Claims (10)
1. An electrical leakage detection circuit, comprising:
the device comprises a test circuit, a voltage division circuit, a control switch circuit, a switch circuit and a first alarm circuit; wherein,
the test circuit is used for outputting a high level signal when judging that the leakage voltage of the device to be tested is greater than the reference voltage, the first input end of the test circuit is connected to the reference voltage, the second input end of the test circuit is connected to the device to be tested, and the output end of the test circuit is connected to the input end of the voltage division circuit;
the voltage division circuit is used for dividing the high level signal and inputting the high level signal to the control switch circuit, a first output end of the voltage division circuit is connected to a first end of the control switch circuit, and a second output end of the voltage division circuit is connected to a ground end;
the control switch circuit is used for amplifying input current and controlling the switch circuit to be conducted, a second end of the control switch circuit is connected to a first end of the switch circuit and a first power supply, and a third end of the control switch circuit is connected to the grounding end;
the switch circuit is used for controlling the second end of the switch circuit to be communicated with the grounding end, the second end of the switch circuit is connected to the output end of the first alarm circuit, the third end of the switch circuit is connected to the grounding end, and the input end of the first alarm circuit is connected to the first power supply.
2. The electrical leakage detection circuit of claim 1, wherein the test circuit comprises an operational amplifier and a diode, wherein,
the inverting terminal of the operational amplifier is connected to the reference voltage, the non-inverting terminal of the operational amplifier is connected to the device to be tested, the output terminal of the operational amplifier is connected to the anode of the diode, and the cathode of the diode is connected to the input terminal of the voltage division circuit.
3. The electrical leakage detection circuit of claim 1, wherein the voltage divider circuit comprises a first resistor and a second resistor, wherein,
the first end of the first resistor is connected to the output end of the test circuit, the second end of the first resistor is connected to the first end of the second resistor and the first end of the control switch circuit, and the second end of the second resistor is connected to the ground end.
4. The electrical leakage detection circuit of claim 1, wherein the control switch circuit comprises a first transistor and a third resistor, wherein,
the base electrode of the first triode is connected to the first output end of the voltage division circuit, the collector electrode of the first triode is connected to the first end of the third resistor, the emitter electrode of the first triode is connected to the ground terminal, and the second end of the third resistor is connected to the first end of the switch circuit and the first power supply.
5. The electrical leakage detection circuit of claim 1, wherein the switching circuit comprises a second transistor and a fourth resistor, wherein,
the first end of the fourth resistor is connected to the second end of the control switch circuit and the first power supply, the second end of the fourth resistor is connected to the base electrode of the second triode, the collector electrode of the second triode is connected to the output end of the first alarm circuit, and the emitter electrode of the second triode is connected to the grounding end.
6. The electrical leakage detection circuit of claim 1, wherein the first alarm circuit comprises a light emitting diode and a fifth resistor, wherein,
the anode of the light emitting diode is connected to the first power supply, the cathode of the light emitting diode is connected to the first end of the fifth resistor, and the second end of the fifth resistor is connected to the second end of the switch circuit.
7. The electrical leakage detection circuit according to claim 1, further comprising: a second alarm circuit, wherein,
the input end of the second alarm circuit is connected to a second power supply, and the output end of the second alarm circuit is connected to the second end of the switch circuit.
8. The electrical leakage detection circuit of claim 7, wherein the second alarm circuit comprises: an alarm, wherein,
the input end of the alarm is connected to the second power supply, and the output end of the alarm is connected to the second end of the switch circuit.
9. The electrical leakage detection circuit of claim 8, wherein the alarm is an audible alarm.
10. An electric leakage detection tool, characterized by comprising the electric leakage detection circuit of any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420662696.XU CN204142883U (en) | 2014-11-07 | 2014-11-07 | Electric leakage detection circuit and electric leakage detection tool |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420662696.XU CN204142883U (en) | 2014-11-07 | 2014-11-07 | Electric leakage detection circuit and electric leakage detection tool |
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| CN204142883U true CN204142883U (en) | 2015-02-04 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105093134A (en) * | 2015-09-07 | 2015-11-25 | 湖北三江航天万峰科技发展有限公司 | Multi-path multiplexing type power supply leakage detection automatic control device |
| CN109959834A (en) * | 2017-12-14 | 2019-07-02 | 中国石油天然气股份有限公司 | Electric leakage detection device |
| CN113376517A (en) * | 2021-07-14 | 2021-09-10 | 广州创锐车用电器有限公司 | Leakage detection circuit of handle switch and handle switch |
-
2014
- 2014-11-07 CN CN201420662696.XU patent/CN204142883U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105093134A (en) * | 2015-09-07 | 2015-11-25 | 湖北三江航天万峰科技发展有限公司 | Multi-path multiplexing type power supply leakage detection automatic control device |
| CN105093134B (en) * | 2015-09-07 | 2018-01-05 | 湖北三江航天万峰科技发展有限公司 | A kind of power supply leak detection automaton of multichannel multiplexing |
| CN109959834A (en) * | 2017-12-14 | 2019-07-02 | 中国石油天然气股份有限公司 | Electric leakage detection device |
| CN113376517A (en) * | 2021-07-14 | 2021-09-10 | 广州创锐车用电器有限公司 | Leakage detection circuit of handle switch and handle switch |
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