CN110726956A - Electric leakage detection circuit and device - Google Patents
Electric leakage detection circuit and device Download PDFInfo
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- CN110726956A CN110726956A CN201911085270.6A CN201911085270A CN110726956A CN 110726956 A CN110726956 A CN 110726956A CN 201911085270 A CN201911085270 A CN 201911085270A CN 110726956 A CN110726956 A CN 110726956A
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Abstract
The application relates to a leakage detection circuit and device, in being applied to AC power supply system, the leakage detection circuit includes: the power supply comprises a first power supply input end, a second power supply input end, a first power supply output end, a second power supply output end, a first voltage division module, a second voltage division module, a third voltage division module, a first photoelectric coupler, a second photoelectric coupler, a first switching transistor, a second switching transistor, a first resistor, a second resistor, a third resistor, a fourth resistor, a first diode and a second diode; when the electric leakage condition exists between the first power output end and the electric equipment side, the output end of the first photoelectric coupler outputs a square wave signal; when the electric leakage condition exists between the second power output end and the electric equipment side, the output end of the second photoelectric coupler outputs a square wave signal. Therefore, the problem that the current between the electric equipment and the N line of the connecting cable cannot be measured is solved, and the safety of the electric equipment is further guaranteed.
Description
Technical Field
The application relates to the technical field of electric leakage detection, in particular to an electric leakage detection circuit and device.
Background
With the development of modernization, various electric equipment such as household appliances and electric tools are continuously updated, and full-automatic intelligent centralized control systems are more and more, so that the harm caused by potential safety hazards such as electric leakage is more and more serious, and whether the electric equipment has an invisible electric leakage fault or not is more and more important to detect.
In the related art, generally, since the neutral line of the neutral line on the output side of the power transformer is connected to the ground, and the cable or the electric equipment is also mounted on the base with the ground, the potential difference between the cable line connected to the N line (zero) of the electric equipment and the neutral line of the electric equipment is small, and it is impossible to measure whether or not there is a leakage between the electric equipment and the N line of the connection cable line.
Disclosure of Invention
In view of the above, the present application is directed to overcoming the above-mentioned deficiencies of the related art and providing a leakage detecting circuit and device.
In order to achieve the purpose, the following technical scheme is adopted in the application:
a first aspect of the present application provides a leakage detection circuit, which is applied to an ac power supply system and used for performing leakage detection, the leakage detection circuit includes:
the first power supply input end and the second power supply input end are respectively used for being connected to the alternating current power supply side;
the first power supply output end and the second power supply output end are respectively used for being connected to the electric equipment side;
the voltage divider comprises a first voltage dividing module, a second voltage dividing module, a third voltage dividing module, a first photoelectric coupler, a second photoelectric coupler, a first switching transistor, a second switching transistor, a first resistor, a second resistor, a third resistor, a fourth resistor, a first diode and a second diode;
the base electrode of the first switching transistor is respectively connected with the second power supply output end and the first end of the second resistor through the first resistor; an emitter of the first switching transistor is respectively connected with a cathode of the first diode, and is connected with a second end of the second resistor and the second power input end through the first voltage division module; the collector of the first switching transistor is connected with the second input end of the second photoelectric coupler; the anode of the first diode is connected with the first input end of the first photoelectric coupler; the base electrode of the second switching transistor is respectively connected with the first end of the fourth resistor and the first power supply output end through the third resistor; an emitter of the second switching transistor is respectively connected with an anode of the second diode and connected with a second end of the fourth resistor and the first power supply input end through the second voltage division module; the negative electrode of the second diode is connected with the first input end of the second photoelectric coupler; the collector of the second switching transistor is connected with the second input end of the first photoelectric coupler; the first end of the fourth resistor is connected with the second end of the second resistor through the third voltage division module;
when the leakage condition exists between the first power output end and the electric equipment side, the negative half cycle of the leakage current passes through the third resistor to reach the base electrode of the second switch transistor, the second switch transistor is conducted, and the output end of the first photoelectric coupler outputs a square wave signal; when leakage exists between the second power output end and the electric equipment side, the positive half cycle of leakage current passes through the first resistor to reach the base of the first switch transistor, the first switch transistor is conducted, and the output end of the second photoelectric coupler outputs a square wave signal.
Optionally, the first voltage division module includes a first bidirectional transient diode or two second zener diodes connected in series; and the cathodes of the two first voltage stabilizing diodes connected in series are connected with each other.
Optionally, the second voltage division module includes a second bi-directional transient diode or two second zener diodes connected in series; and the cathodes of the two second voltage stabilizing diodes connected in series are connected with each other.
Optionally, the third voltage division module includes a third bidirectional transient diode or two third zener diodes connected in series; and the cathodes of the two third voltage stabilizing diodes connected in series are connected with each other.
Optionally, the third voltage division module further includes two third diodes and a fourth diode connected in parallel; and the anode of the third diode is connected with the cathode of the fourth diode, and the two parallel third diodes and the two parallel fourth diodes are connected in series with the third bidirectional transient diode or the two series third voltage-stabilizing diodes.
Optionally, the third voltage dividing module further includes a fifth resistor, and the fifth resistor is connected in series with the third bidirectional transient diode or the two third zener diodes connected in series.
Optionally, the capacitor further comprises a first capacitor and a second capacitor; a first end of the first capacitor is connected with the base electrode of the first switch transistor, and a second end of the first capacitor is connected with the emitter electrode of the first switch transistor; a first terminal of the second capacitor is connected to the base of the second switching transistor, and a second terminal is connected to the emitter of the second switching transistor.
Optionally, the device further comprises a sixth resistor; a first end of the sixth resistor is connected to the base of the first switching transistor, and a second end of the sixth resistor is connected to the emitter of the first switching transistor.
Optionally, the device further comprises a seventh resistor; a first end of the seventh resistor is connected to the base of the second switching transistor, and a second end of the seventh resistor is connected to the emitter of the second switching transistor.
A second aspect of the present application provides a leakage detection device comprising a leakage detection circuit as described in the first aspect of the present application.
The technical scheme provided by the application can comprise the following beneficial effects:
according to the scheme of the application, the input voltage of the alternating current power supply side is divided into three parts by utilizing a first voltage division module, a second voltage division module and a third voltage division module in the electric leakage detection circuit and used as the measurement voltage of electric leakage detection, when the electric leakage condition exists between the output end of the first power supply and the electric equipment side, the negative half cycle of the electric leakage current passes through a third resistor to the base electrode of a second switching transistor, the second switching transistor is conducted, and the output end of a first photoelectric coupler outputs a square wave signal; when the leakage condition exists between the output end of the second power supply and the electric equipment side, the positive half cycle of the leakage current passes through the first resistor to reach the base electrode of the first switching transistor, the first switching transistor is conducted, and the output end of the second photoelectric coupler outputs a square wave signal. Therefore, the voltage obtained after the input alternating current power supply is divided is used as the measurement voltage, the current condition is actively detected through the leakage detection circuit, the problem that the current between the electric equipment and the N line of the connecting cable cannot be measured is solved, and the safety of the electric equipment is further guaranteed.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings 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 some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a circuit diagram of a leakage detection circuit according to an embodiment of the present application.
Fig. 2 is a circuit diagram of another leakage detection circuit according to an embodiment of the present application.
Fig. 3 is an equivalent circuit diagram of the leakage detecting circuit in fig. 2 according to an embodiment of the present application.
Fig. 4 is another equivalent circuit diagram of the leakage detecting circuit in fig. 2 according to an embodiment of the present application.
Fig. 5 is another equivalent circuit diagram of the leakage detecting circuit in fig. 2 according to an embodiment of the present application.
Fig. 6 is another equivalent circuit diagram of the leakage detecting circuit in fig. 2 according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail below. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without making any creative effort, shall fall within the protection scope of the present application.
Examples
Referring to fig. 1, fig. 1 is a circuit diagram of a leakage detection circuit according to an embodiment of the present application.
As shown in fig. 1, the present embodiment provides a leakage detection circuit applied in an ac power supply system for performing leakage detection, including:
the first power supply input end A and the second power supply input end B are respectively used for being connected to an alternating current power supply side;
the first power supply output end C and the second power supply output end D are respectively used for being connected to the electric equipment side;
the voltage divider comprises a first voltage dividing module 1, a second voltage dividing module 2, a third voltage dividing module 3, a first photoelectric coupler U1, a second photoelectric coupler U2, a first switching transistor Q1, a second switching transistor Q2, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a first diode D1 and a second diode D2;
the base of the first switching transistor Q1 is connected to the second power output terminal D and the first end of the second resistor R2 through the first resistor R1; the emitter of the first switching transistor Q1 is connected to the cathode of the first diode D1, the second end of the second resistor R2 through the first voltage dividing module 1, and the second power input terminal B, respectively; the collector of the first switching transistor Q1 is connected with the second input end of the second photocoupler U2; the anode of the first diode D1 is connected with the first input end of the first photoelectric coupler U1; the base of the second switching transistor Q2 is connected to the first end of the fourth resistor R4 and the first power output terminal C through the third resistor R3; the emitters of the second switching transistor Q2 are respectively connected to the anode of the second diode D2, and the second terminal of the fourth resistor R4 and the first power input terminal a through the second voltage dividing module 2; the negative electrode of the second diode D2 is connected with the first input end of the second photoelectric coupler U2; the collector of the second switching transistor Q2 is connected with the second input end of the first photocoupler U1; a first end of the fourth resistor R4 is connected to a second end of the second resistor R2 through the third voltage dividing module 3;
when the leakage condition exists between the first power output end C and the electric equipment side, the negative half cycle of the leakage current passes through the third resistor R3 to reach the base electrode of the second switch transistor Q2, the second switch transistor Q2 is conducted, and the output end of the first photoelectric coupler U1 outputs a square wave signal; when the leakage condition exists between the second power output end D and the electric equipment side, the positive half cycle of the leakage current passes through the first resistor R1 to reach the base electrode of the first switch transistor Q1, the first switch transistor Q1 is conducted, and the output end of the second photoelectric coupler U2 outputs a square wave signal.
According to the scheme of the application, the input voltage of the alternating current power supply side is divided into three parts by utilizing a first voltage division module, a second voltage division module and a third voltage division module in the electric leakage detection circuit and used as the measurement voltage of electric leakage detection, when the electric leakage condition exists between the output end of the first power supply and the electric equipment side, the negative half cycle of the electric leakage current passes through a third resistor to the base electrode of a second switching transistor, the second switching transistor is conducted, and the output end of a first photoelectric coupler outputs a square wave signal; when the leakage condition exists between the output end of the second power supply and the electric equipment side, the positive half cycle of the leakage current passes through the first resistor to reach the base electrode of the first switching transistor, the first switching transistor is conducted, and the output end of the second photoelectric coupler outputs a square wave signal. Therefore, the voltage obtained after the input alternating current power supply is divided is used as the measurement voltage, the current condition is actively detected through the leakage detection circuit, the problem that the current between the electric equipment and the N line of the connecting cable cannot be measured is solved, and the safety of the electric equipment is further guaranteed.
The first switching transistor may include, but is not limited to, an NPN transistor.
The second switching transistor may include, but is not limited to, a PNP transistor.
When the first switching transistor uses an NPN type triode and the second switching transistor uses a PNP type triode, the first switching transistor and the second switching transistor are high-voltage paired transistors with complementary polarities.
In some embodiments, the first voltage division module comprises a first bi-directional transient diode or two first zener diodes connected in series; wherein the cathodes of the two first zener diodes connected in series are connected to each other. The first voltage division module is mainly used for reducing the voltage of the second power supply input end.
In some embodiments, the second voltage division module comprises a second bi-directional transient diode or two second zener diodes connected in series; and the cathodes of the two second voltage stabilizing diodes connected in series are connected with each other. The second voltage division module is mainly used for reducing the voltage of the first power supply input end.
In some embodiments, the third voltage division module comprises a third bi-directional transient diode or two third zener diodes connected in series; and the cathodes of the two third voltage stabilizing diodes connected in series are connected with each other. The third voltage division module plays a role of limiting and clamping in the leakage detection circuit.
In some embodiments, as shown in fig. 1, the third voltage dividing module 3 further includes two parallel-connected third diodes D3 and fourth diodes D4; wherein the anode of the third diode D3 is connected to the cathode of the fourth diode D4, and the two parallel third and fourth diodes D3 and D4 are connected in series with a third bi-directional transient diode or two series third zener diodes D9 and D10.
In a specific implementation, the third diode comprises a light emitting diode. The two parallel third diodes and the fourth diode play the role of amplitude limiting and are used for power supply indication.
In some embodiments, as shown in fig. 1, the third voltage dividing module further includes a fifth resistor R5, and the fifth resistor R5 is connected in series with a third bi-directional transient diode or two third zener diodes D9 and D10 connected in series.
In practical application, as shown in fig. 1, each of the first voltage division module 1, the second voltage division module 2, and the third voltage division module 3 employs two voltage stabilizing diodes D5 and D6, D7 and D8, and D9 and D10 connected in series, wherein an anode of a first voltage stabilizing diode D5 in the first voltage division module 1 is connected to a second end of the second resistor R2, a cathode of the first voltage stabilizing diode D6 is connected to a cathode of the first voltage stabilizing diode D3624, and a cathode of the first voltage stabilizing diode D6 is connected to an emitter of the first switching transistor Q1; the anode of a second zener diode D7 in the second voltage division module 2 is connected to the second end of the fourth resistor R4, the cathode of the second zener diode D7 is connected to the cathode of the second zener diode D8, and the anode of the second zener diode D8 is connected to the emitter of the second switching transistor Q2; the anode of the third zener diode D9 in the third voltage division module 3 is connected to the first end of the fourth resistor R4, the cathode is connected to the cathode of the third zener diode D10, the anode of the third zener diode D10 is connected to the cathode of the third diode D3 and the anode of the fourth diode D4, respectively, the anode of the third diode D3 is connected to the cathode of the fourth diode D4, and is connected to the second end of the second resistor R2 through the fifth resistor R5.
Referring to fig. 2, fig. 2 is a circuit diagram of another leakage detection circuit provided in an embodiment of the present application.
In some embodiments, as shown in fig. 2, the leakage detection circuit further includes a first capacitor C1 and a second capacitor C2; a first end of the first capacitor C1 is connected with the base of the first switch transistor Q1, and a second end is connected with the emitter of the first switch transistor Q1; a first terminal of the second capacitor C2 is connected to the base of the second switching transistor Q2, and a second terminal is connected to the emitter of the second switching transistor Q2. The first capacitor and the second capacitor are used for detecting the received clutter and high frequency interference signals.
In some embodiments, as shown in fig. 2, the leakage detection circuit further includes a sixth resistor R6; the sixth resistor R6 has a first terminal connected to the base of the first switching transistor Q1 and a second terminal connected to the emitter of the first switching transistor Q1. In a specific implementation, the sixth resistor is used as a bias resistor of the first switching transistor to perform leakage sensitivity adjustment.
In some embodiments, as shown in fig. 2, the leakage detection circuit further includes a seventh resistor R7; the seventh resistor R7 has a first terminal connected to the base of the second switching transistor Q2 and a second terminal connected to the emitter of the second switching transistor Q2. In a specific implementation, the seventh resistor is used as a bias resistor of the second switching transistor to perform leakage sensitivity adjustment.
As shown in fig. 2, the leakage detecting circuit further includes an eighth resistor R8 and a ninth resistor R9, wherein an emitter of the first switching transistor Q1 is connected to a cathode of the first diode D1 through the eighth resistor R8, and an emitter of the second switching transistor Q2 is connected to an anode of the second diode D2 through the ninth resistor R9. Preferably, the first switching transistor may be, but is not limited to, an NPN transistor MMBTA 42; the second switching transistor may be, but is not limited to, a PNP-type transistor MMBTA 92; the first and second photo-couplers may be, but are not limited to, PC817 photo-couplers; the resistances of the first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4 and the fifth resistor R5 may be but not limited to 2M Ω, the resistances of the sixth resistor R6 and the seventh resistor R7 may be but not limited to 15K Ω, the resistances of the eighth resistor R8 and the ninth resistor R9 may be but not limited to 130K Ω, the capacitances of the first capacitor C1 and the second capacitor C2 are both 100NF, the third diode D3 is a light emitting diode, and other diodes may be M7.
In practical application, the first power input end a may be connected to a switch or a relay of an L-line (live wire), and when the switch is not connected to a circuit or the relay is in a normally open state, as shown in fig. 1, if there is a leakage condition from the first power output end C to the electric equipment side, a negative half cycle of the leakage current passes through the third resistor R3 to the base of the second switching transistor Q2, the second switching transistor Q2 is turned on, and the output end F of the first photocoupler U1 outputs a square wave signal; if the second power output end D has the electric leakage condition to the electric equipment side, the positive half cycle of the leakage current passes through the first resistor R1 to reach the base electrode of the first switch transistor Q1, the first switch transistor Q1 is conducted, and the output end E of the second photoelectric coupler U2 outputs a square wave signal; if the L line is not connected with the electric equipment side, the output end F of the first photoelectric coupler U1 and the output end E of the second photoelectric coupler U2 do not output any output; if the L line is normally connected with the electric equipment side, the output end F of the first photoelectric coupler U1 and the output end E of the second photoelectric coupler U2 output the same square wave signal, the electric equipment is normal, and no electric leakage condition exists.
Referring to fig. 3, fig. 3 is an equivalent circuit diagram of the leakage detecting circuit in fig. 2 according to an embodiment of the present disclosure.
Referring to fig. 4, fig. 4 is another equivalent circuit diagram of the leakage detecting circuit in fig. 2 according to an embodiment of the present disclosure.
Referring to fig. 5, fig. 5 is another equivalent circuit diagram of the leakage detecting circuit in fig. 2 according to an embodiment of the present disclosure.
Referring to fig. 6, fig. 6 is another equivalent circuit diagram of the leakage detecting circuit in fig. 2 according to an embodiment of the present disclosure.
Taking 220V ac as an example, when the electric equipment does not start operating, the electric equipment can be detected to have electric leakage.
Under the condition that the first power input end is connected with a live wire and the second power input end is connected with a zero wire, when the output live wire of the first power output end is in contact with the ground, as shown in fig. 3, the second switching transistor Q2 is conducted, a loop is formed through an element between the first power input end a and the second power input end B, and the output end F of the first photoelectric coupler U1 outputs a square wave signal; when the output zero line of the second power output end is in contact with the ground, as shown in fig. 4, the leakage current passes through the third voltage division module 3 and the third resistor R3 to reach the base of the second switching transistor Q2, the second switching transistor Q2 is turned on, a loop is formed through an element between the first power input end a and the second power input end B, and the output end F of the first photocoupler U1 outputs a square wave signal.
Under the condition that the first power input end is connected with a zero line and the second power input end is connected with a live line, when the output live line of the second power output end is in contact with the ground, as shown in fig. 5, leakage current flows to the base electrode of the first switching transistor Q1 through the first resistor R1, the first switching transistor Q1 is conducted, a loop is formed through an element between the second power input end B and the first power input end A, and the output end E of the second photoelectric coupler U2 outputs a square wave signal; when the output zero line of the first power output end is in contact with the ground, as shown in fig. 6, the leakage current passes through the third voltage division module 3 and the first resistor R1 to reach the base of the first switching transistor Q1, the first switching transistor Q1 is turned on, a loop is formed through an element between the second power input end B and the first power input end a, and the output end E of the second photocoupler U2 outputs a square wave signal.
Another embodiment of the present application provides a leakage detecting device, including the leakage detecting circuit according to any of the above embodiments of the present application.
It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar parts in other embodiments may be referred to for the content which is not described in detail in some embodiments.
It should be noted that, in the description of the present application, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Further, in the description of the present application, the meaning of "a plurality" means at least two unless otherwise specified.
In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," 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 application. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.
Claims (10)
1. An electric leakage detection circuit, characterized in that, be applied to in the alternating current power supply system for carry out electric leakage detection, electric leakage detection circuit includes:
the first power supply input end and the second power supply input end are respectively used for being connected to the alternating current power supply side;
the first power supply output end and the second power supply output end are respectively used for being connected to the electric equipment side;
the voltage divider comprises a first voltage dividing module, a second voltage dividing module, a third voltage dividing module, a first photoelectric coupler, a second photoelectric coupler, a first switching transistor, a second switching transistor, a first resistor, a second resistor, a third resistor, a fourth resistor, a first diode and a second diode;
the base electrode of the first switching transistor is respectively connected with the second power supply output end and the first end of the second resistor through the first resistor; an emitter of the first switching transistor is respectively connected with a cathode of the first diode, and is connected with a second end of the second resistor and the second power input end through the first voltage division module; the collector of the first switching transistor is connected with the second input end of the second photoelectric coupler; the anode of the first diode is connected with the first input end of the first photoelectric coupler; the base electrode of the second switching transistor is respectively connected with the first end of the fourth resistor and the first power supply output end through the third resistor; an emitter of the second switching transistor is respectively connected with an anode of the second diode and connected with a second end of the fourth resistor and the first power supply input end through the second voltage division module; the negative electrode of the second diode is connected with the first input end of the second photoelectric coupler; the collector of the second switching transistor is connected with the second input end of the first photoelectric coupler; the first end of the fourth resistor is connected with the second end of the second resistor through the third voltage division module;
when the leakage condition exists between the first power output end and the electric equipment side, the negative half cycle of the leakage current passes through the third resistor to reach the base electrode of the second switch transistor, the second switch transistor is conducted, and the output end of the first photoelectric coupler outputs a square wave signal; when leakage exists between the second power output end and the electric equipment side, the positive half cycle of leakage current passes through the first resistor to reach the base of the first switch transistor, the first switch transistor is conducted, and the output end of the second photoelectric coupler outputs a square wave signal.
2. The electrical leakage detection circuit of claim 1, wherein the first voltage division module comprises a first bi-directional transient diode or two first zener diodes connected in series; and the cathodes of the two first voltage stabilizing diodes connected in series are connected with each other.
3. The electrical leakage detection circuit of claim 1, wherein the second voltage division module comprises a second bi-directional transient diode or two second zener diodes connected in series; and the cathodes of the two second voltage stabilizing diodes connected in series are connected with each other.
4. The electrical leakage detection circuit of claim 1, wherein the third voltage division module comprises a third bi-directional transient diode or two third zener diodes connected in series; and the cathodes of the two third voltage stabilizing diodes connected in series are connected with each other.
5. The electrical leakage detection circuit of claim 4, wherein the third voltage division module further comprises two third and fourth diodes connected in parallel; and the anodes of the third diodes are connected with the cathodes of the fourth diodes, and the two parallel third diodes and the two parallel fourth diodes are connected with the third bidirectional transient diode or the two series third voltage stabilizing diodes in series.
6. The leakage detection circuit of claim 5, wherein the third voltage divider module further comprises a fifth resistor connected in series with the third bi-directional transient diode or the two serially connected third zener diodes.
7. The electrical leakage detection circuit of claim 1, further comprising a first capacitor and a second capacitor; a first end of the first capacitor is connected with the base electrode of the first switch transistor, and a second end of the first capacitor is connected with the emitter electrode of the first switch transistor; a first terminal of the second capacitor is connected to the base of the second switching transistor, and a second terminal is connected to the emitter of the second switching transistor.
8. The electrical leakage detection circuit according to claim 1, further comprising a sixth resistor; a first end of the sixth resistor is connected to the base of the first switching transistor, and a second end of the sixth resistor is connected to the emitter of the first switching transistor.
9. The electrical leakage detection circuit according to claim 1, further comprising a seventh resistor; a first end of the seventh resistor is connected to the base of the second switching transistor, and a second end of the seventh resistor is connected to the emitter of the second switching transistor.
10. An electrical leakage detection device comprising the electrical leakage detection circuit according to any one of claims 1 to 9.
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| CN112763938A (en) * | 2020-12-24 | 2021-05-07 | 唐新颖 | Residual leakage detection method based on fluxgate |
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| CN112763938A (en) * | 2020-12-24 | 2021-05-07 | 唐新颖 | Residual leakage detection method based on fluxgate |
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| CN110726956B (en) | 2024-07-12 |
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