CN111812553A - Detection circuit of alternating current input line and socket with detection circuit - Google Patents
Detection circuit of alternating current input line and socket with detection circuit Download PDFInfo
- Publication number
- CN111812553A CN111812553A CN202010655195.9A CN202010655195A CN111812553A CN 111812553 A CN111812553 A CN 111812553A CN 202010655195 A CN202010655195 A CN 202010655195A CN 111812553 A CN111812553 A CN 111812553A
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- China
- Prior art keywords
- resistor
- diode
- detection circuit
- input line
- switching tube
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/66—Testing of connections, e.g. of plugs or non-disconnectable joints
- G01R31/67—Testing the correctness of wire connections in electric apparatus or circuits
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/66—Testing of connections, e.g. of plugs or non-disconnectable joints
- G01R31/68—Testing of releasable connections, e.g. of terminals mounted on a printed circuit board
- G01R31/69—Testing of releasable connections, e.g. of terminals mounted on a printed circuit board of terminals at the end of a cable or a wire harness; of plugs; of sockets, e.g. wall sockets or power sockets in appliances
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
- H01R13/66—Structural association with built-in electrical component
- H01R13/665—Structural association with built-in electrical component with built-in electronic circuit
Abstract
The invention discloses a detection circuit of an alternating current input line and a socket with the detection circuit, wherein the anode of a first diode D1 of the detection circuit of the alternating current input line is connected with a live wire terminal, the output end of a first diode D1 is connected with one end of a first resistor R1, the other end of the first resistor R1 is connected with one end of a fourth resistor R4, the other end of the fourth resistor R4 is connected with the anode of a second diode D2, and the cathode of the second diode D2 is connected with a zero wire terminal; an anode of the third diode D3 is connected between the connection line of the first resistor R1 and the fourth resistor R4, and a cathode of the third diode D3 is connected to a ground terminal; the control end of the switching tube Q1 is connected between the connection lines of the first resistor R1 and the fourth resistor R4, the input end of the switching tube Q1 is connected with the signal output end, and the output end of the switching tube Q1 is connected between the connection of the fourth resistor R4 and the anode of the second diode D2. By applying the method and the device, the conditions of ground wire abnormity and reverse connection of the zero line and the live wire can be effectively detected.
Description
Technical Field
The invention relates to the technical field of power supply wiring, in particular to a detection circuit of an alternating current input line and a socket with the detection circuit.
Background
In the prior art, most of switch sockets are mechanically switched on and off, and whether the ground wire is well contacted or not and whether the live wire and the zero line are reversely connected or not cannot be detected. As equipment with a ground wire (three plugs) is generally grounded on a machine shell or grounded through a Y capacitor, once the ground wire is poor, the EMI performance is slightly poor, other electrical equipment can be seriously damaged, particularly sensitive devices of a tested circuit are easily burnt during production test, and more serious personnel are electrically shocked, so that the life safety is threatened. If the ground wire and the live wire are reversely connected, the switch normally only cuts off the zero wire, the live wire is still connected, some equipment can generate leakage tripping, some short circuits are ignited, and the equipment has no early warning, so that electric shock accidents or other disasters can be easily caused. Currently, switches or sockets lack the relevant detection and protection.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a detection circuit of an alternating current input line, which can effectively detect the conditions of ground wire abnormality and reverse connection of a live wire and a zero line.
The invention also provides a socket with the detection circuit of the alternating current input line.
According to the detection circuit of the alternating current input line of the embodiment of the first aspect of the invention, a live wire terminal, a neutral wire terminal, a ground wire terminal, a signal output terminal, a first diode D1, a first resistor R1, a fourth resistor R4, a second diode D2, a third diode D3 and a switch tube Q1, wherein the anode of the first diode D1 is connected with the live wire terminal, the output terminal of the first diode D1 is connected with one end of the first resistor R1, the other end of the first resistor R1 is connected with one end of the fourth resistor R4, the other end of the fourth resistor R4 is connected with the anode of the second diode D2, and the cathode of the second diode D2 is connected with the neutral wire terminal; an anode of the third diode D3 is connected between the connection of the first resistor R1 and the fourth resistor R4, and a cathode of the third diode D3 is connected to the ground terminal; the control end of the switch tube Q1 is connected between the connection lines of the first resistor R1 and the fourth resistor R4, the input end of the switch tube Q1 is connected with the signal output end, and the output end of the switch tube Q1 is connected between the connection of the fourth resistor R4 and the anode of the second diode D2.
The detection circuit of the alternating current input line according to the embodiment of the invention has at least the following beneficial effects: when the circuit is normally turned on, a tiny current flows from the live wire terminal to the first diode D1, the first resistor R1 and the third diode D3, due to the voltage clamping effect of the third diode D3, the voltage between the fourth resistor R4 and the second diode D2 is equal to the clamping voltage of the third diode D3 and is less than 1V, and the clamping voltage of the second diode D2 is the same as the clamping voltage of the third diode D3, so that the voltage is hardly obtained by the fourth resistor R4, and at this time, the switch Q1 is in an off state, and the signal output end has no signal change, so that no signal output reflecting an abnormal condition exists. When the ground wire is abnormal, that is, the impedance of the branch where the ground wire terminal and the third diode D3 are located is increased or opened, the third diode D3 loses the function of voltage clamping, the voltage of the node between the first resistor R1 and the fourth resistor R4 is increased, the voltage obtained by the fourth resistor R4 is higher than the conduction voltage of the switching tube Q1 (usually 1 to 3V), and at the moment, the switching tube Q1 is turned on, so that the signal at the signal output end is changed, and a signal with circuit abnormality is output. When the live wire and the zero wire are connected reversely, namely the external live wire is connected to the zero wire terminal, the zero wire is connected to the live wire terminal, at the moment, because the zero wire terminal and the ground wire terminal are almost equipotential, the third diode D3 is not conducted, no current passes through, the current flows from the zero wire terminal to the first diode D1, the first resistor R1, the fourth resistor R4 and the second diode D2, the fourth resistor R4 obtains enough bias voltage to enable the switching tube Q1 to be switched on, the signal of the signal output end changes, and therefore the abnormal signal of the circuit is output. Therefore, the situation that the ground wire is abnormal and the live wire and the zero wire are reversely connected can be effectively detected through the circuit.
According to some embodiments of the present invention, the apparatus further comprises a capacitor C1, one end of the capacitor C1 is connected to the control terminal of the switching tube Q1, and the other end of the capacitor C1 is connected to the output terminal of the switching tube Q1.
According to some embodiments of the present invention, a third resistor R3 is further connected in series between the first resistor R1 and the fourth resistor R4, an anode of the third diode D3 is connected between a connection line of the third resistor R3 and the fourth resistor R4, and a control terminal of the switching tube Q1 is connected between a connection line of the third resistor R3 and the fourth resistor R4.
According to some embodiments of the invention, a second resistor R2 is also connected in series between the first resistor R1 and the third resistor R3.
According to some embodiments of the present invention, the switching transistor Q1 is a MOS transistor.
According to some embodiments of the present invention, the switching transistor Q1 is an N-type MOS transistor.
According to some embodiments of the invention, the switching tube Q1 is a triode.
According to some embodiments of the invention, the switching transistor Q1 is an N-type transistor.
A receptacle according to an embodiment of the second aspect of the invention includes the detection circuit for the ac input line described above.
The socket according to the embodiment of the invention has at least the following beneficial effects: when the circuit is normally turned on, a tiny current flows from the live wire terminal to the first diode D1, the first resistor R1 and the third diode D3, due to the voltage clamping effect of the third diode D3, the voltage between the fourth resistor R4 and the second diode D2 is equal to the clamping voltage of the third diode D3 and is less than 1V, and the clamping voltage of the second diode D2 is the same as the clamping voltage of the third diode D3, so that the voltage is hardly obtained by the fourth resistor R4, and at this time, the switch Q1 is in an off state, and the signal output end has no signal change, so that no signal output reflecting an abnormal condition exists. When the ground wire is abnormal, that is, the impedance of the branch where the ground wire terminal and the third diode D3 are located is increased or opened, the third diode D3 loses the function of voltage clamping, the voltage of the node between the first resistor R1 and the fourth resistor R4 is increased, the voltage obtained by the fourth resistor R4 is higher than the conduction voltage of the switching tube Q1 (usually 1 to 3V), and at the moment, the switching tube Q1 is turned on, so that the signal at the signal output end is changed, and a signal with circuit abnormality is output. When the live wire and the zero wire are connected reversely, namely the external live wire is connected to the zero wire terminal, the zero wire is connected to the live wire terminal, at the moment, because the zero wire terminal and the ground wire terminal are almost equipotential, the third diode D3 is not conducted, no current passes through, the current flows from the zero wire terminal to the first diode D1, the first resistor R1, the fourth resistor R4 and the second diode D2, the fourth resistor R4 obtains enough bias voltage to enable the switching tube Q1 to be switched on, the signal of the signal output end changes, and therefore the abnormal signal of the circuit is output. Therefore, the situation that the ground wire is abnormal and the live wire and the zero wire are reversely connected can be effectively detected through the circuit.
According to some embodiments of the invention, further comprising a housing, the detection circuitry of the ac input line being disposed within the housing.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a circuit diagram of a detection circuit of an AC input line according to a first embodiment of the present invention;
FIG. 2 is a circuit diagram of the detection circuit of the AC input line of FIG. 1 when the line and neutral connections are reversed;
fig. 3 is a circuit diagram of a detection circuit of an ac input line according to a second embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, the meaning of a plurality of means is one or more, the meaning of a plurality of means is two or more, and larger, smaller, larger, etc. are understood as excluding the number, and larger, smaller, inner, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.
Referring to fig. 1, an embodiment of the first aspect of the present invention provides a detection circuit of an ac input line, including a live terminal, a neutral terminal, a ground terminal, a signal output terminal, a first diode D1, a first resistor R1, a fourth resistor R4, a second diode D2, a third diode D3, and a switching tube Q1, wherein an anode of the first diode D1 is connected to the live terminal, an output terminal of the first diode D1 is connected to one end of the first resistor R1, the other end of the first resistor R1 is connected to one end of the fourth resistor R4, the other end of the fourth resistor R4 is connected to an anode of the second diode D2, and a cathode of the second diode D2 is connected to the neutral terminal; an anode of the third diode D3 is connected between the connection of the first resistor R1 and the fourth resistor R4, and a cathode of the third diode D3 is connected to the ground terminal; the control end of the switch tube Q1 is connected between the connection lines of the first resistor R1 and the fourth resistor R4, the input end of the switch tube Q1 is connected with the signal output end, and the output end of the switch tube Q1 is connected between the connection of the fourth resistor R4 and the anode of the second diode D2.
When the circuit is normally turned on, a tiny current flows from the live wire terminal to the first diode D1, the first resistor R1 and the third diode D3, due to the voltage clamping effect of the third diode D3, the voltage between the fourth resistor R4 and the second diode D2 is equal to the clamping voltage of the third diode D3 and is less than 1V, and the clamping voltage of the second diode D2 is the same as the clamping voltage of the third diode D3, so that the voltage is hardly obtained by the fourth resistor R4, and at this time, the switch Q1 is in an off state, and the signal output end has no signal change, so that no signal output reflecting an abnormal condition exists.
When the ground line is abnormal, that is, the impedance of the branch where the ground line terminal and the third diode D3 are located is increased or opened, the third diode D3 loses the function of voltage clamping, the voltage of the node between the first resistor R1 and the fourth resistor R4 is increased, and usually, the fourth resistor R4 is set to obtain a divided voltage greater than 3V when the ground line is abnormal, so as to ensure that the voltage at the control terminal of the switching tube Q1 is enough to turn on the switching tube Q1. At this time, the voltage obtained by the fourth resistor R4 is higher than the on voltage of the switching tube Q1 (usually 1 to 3V), and when the switching tube Q1 is on, the signal at the signal output end changes, so as to output a signal with circuit abnormality.
Referring to fig. 2, when the live wire and the neutral wire are connected in reverse, that is, the external live wire is connected to the neutral wire terminal, and the neutral wire is connected to the live wire terminal, at this time, since the neutral wire terminal and the ground wire terminal are almost equal in potential, the third diode D3 is not turned on, no current passes, current flows from the neutral wire terminal to the first diode D1, the first resistor R1, the fourth resistor R4 and the second diode D2, the fourth resistor R4 obtains sufficient bias voltage to turn on the switching tube Q1, and a signal at the signal output end changes, so that an abnormal signal of the circuit is output. Therefore, the situation that the ground wire is abnormal and the live wire and the zero wire are reversely connected can be effectively detected through the circuit.
In some embodiments of the present invention, the present invention further includes a capacitor C1, one end of the capacitor C1 is connected to the control terminal of the switching transistor Q1, and the other end of the capacitor C1 is connected to the output terminal of the switching transistor Q1. The capacitor C1 performs the function of a voltage level wave.
Referring to fig. 3, in some embodiments of the present invention, a third resistor R3 is further connected in series between the first resistor R1 and the fourth resistor R4, an anode of the third diode D3 is connected between a connection line of the third resistor R3 and the fourth resistor R4, and a control end of the switching tube Q1 is connected between a connection line of the third resistor R3 and the fourth resistor R4. A second resistor R2 is also connected in series between the first resistor R1 and the third resistor R3. The second resistor R2 and the third resistor R3 are connected in series between the first resistor R1 and the fourth resistor R4, whereby the withstand voltage of the resistors can be improved.
In some embodiments of the present invention, the switching transistor Q1 is a MOS transistor. The switching tube Q1 is an N-type MOS tube. Or, the switching tube Q1 is a triode. The switching tube Q1 is an N-type triode.
A second aspect of an embodiment of the present invention provides a socket including the detection circuit of the ac input line described above. Still include the casing, the detection circuitry of alternating current input line sets up in the casing.
Since the socket has the detection circuit of the ac input line, when the circuit is normally turned on, a small current flows from the live terminal to the first diode D1, the first resistor R1 and the third diode D3, and the voltage between the fourth resistor R4 and the second diode D2 is equal to the clamping voltage of the third diode D3 and less than 1V due to the voltage clamping action of the third diode D3, and the clamping voltage of the second diode D2 is the same as the clamping voltage of the third diode D3, so that the voltage is hardly obtained by the fourth resistor R4, and at this time, the switching tube Q1 is in an off state, and there is no signal change at the signal output terminal, so there is no signal output in response to an abnormal condition. When the ground wire is abnormal, that is, the impedance of the branch where the ground wire terminal and the third diode D3 are located is increased or opened, the third diode D3 loses the function of voltage clamping, the voltage of the node between the first resistor R1 and the fourth resistor R4 is increased, the voltage obtained by the fourth resistor R4 is higher than the conduction voltage of the switching tube Q1 (usually 1 to 3V), and at the moment, the switching tube Q1 is turned on, so that the signal at the signal output end is changed, and a signal with circuit abnormality is output. When the live wire and the zero wire are connected reversely, namely the external live wire is connected to the zero wire terminal, the zero wire is connected to the live wire terminal, at the moment, because the zero wire terminal and the ground wire terminal are almost equipotential, the third diode D3 is not conducted, no current passes through, the current flows from the zero wire terminal to the first diode D1, the first resistor R1, the fourth resistor R4 and the second diode D2, the fourth resistor R4 obtains enough bias voltage to enable the switching tube Q1 to be switched on, the signal of the signal output end changes, and therefore the abnormal signal of the circuit is output. Therefore, the situation that the ground wire is abnormal and the live wire and the zero wire are reversely connected can be effectively detected through the circuit.
In some specific embodiments, the socket may further include a control chip, a relay switch, an auxiliary power supply, and the like, where the signal output terminal is connected to the control chip, and when the control chip receives a signal indicating that the circuit is abnormal, the control chip sends a corresponding instruction to control the relay switch and the auxiliary power supply to be turned off, so as to cut off the fault input power supply and ensure the power utilization safety of the user. The detection circuits for the ground line fault and the ac input lines of the live and neutral lines, which are mainly proposed here, are not described in detail with respect to the control chip, the relay switch, the auxiliary power supply, etc.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.
Claims (10)
1. A circuit for detecting an ac input line, comprising: the switch comprises a live wire terminal, a zero wire terminal, a ground wire terminal, a signal output end, a first diode D1, a first resistor R1, a fourth resistor R4, a second diode D2, a third diode D3 and a switch tube Q1, wherein the anode of the first diode D1 is connected with the live wire terminal, the output end of the first diode D1 is connected with one end of the first resistor R1, the other end of the first resistor R1 is connected with one end of the fourth resistor R4, the other end of the fourth resistor R4 is connected with the anode of the second diode D2, and the cathode of the second diode D2 is connected with the zero wire terminal; an anode of the third diode D3 is connected between the connection of the first resistor R1 and the fourth resistor R4, and a cathode of the third diode D3 is connected to the ground terminal; the control end of the switch tube Q1 is connected between the connection lines of the first resistor R1 and the fourth resistor R4, the input end of the switch tube Q1 is connected with the signal output end, and the output end of the switch tube Q1 is connected between the connection of the fourth resistor R4 and the anode of the second diode D2.
2. A detection circuit for an ac input line as claimed in claim 1, wherein: the capacitor C1 is further included, one end of the capacitor C1 is connected with the control end of the switching tube Q1, and the other end of the capacitor C1 is connected with the output end of the switching tube Q1.
3. A detection circuit for an ac input line as claimed in claim 1, wherein: a third resistor R3 is also connected in series between the first resistor R1 and the fourth resistor R4, the anode of the third diode D3 is connected between the connecting line of the third resistor R3 and the fourth resistor R4, and the control end of the switching tube Q1 is connected between the connecting line of the third resistor R3 and the fourth resistor R4.
4. A detection circuit for an ac input line as claimed in claim 3, wherein: a second resistor R2 is also connected in series between the first resistor R1 and the third resistor R3.
5. A detection circuit for an ac input line as claimed in claim 1, wherein: the switching tube Q1 is a MOS tube.
6. A detection circuit for an AC input line as claimed in claim 5, wherein: the switching tube Q1 is an N-type MOS tube.
7. A detection circuit for an ac input line as claimed in claim 1, wherein: the switching tube Q1 is a triode.
8. A detection circuit for an AC input line as claimed in claim 7, wherein: the switching tube Q1 is an N-type triode.
9. A socket, characterized in that: a sensing circuit comprising an ac input line as claimed in any one of claims 1 to 8.
10. The receptacle of claim 9, wherein: still include the casing, the detection circuitry of alternating current input line sets up in the casing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010655195.9A CN111812553A (en) | 2020-07-09 | 2020-07-09 | Detection circuit of alternating current input line and socket with detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010655195.9A CN111812553A (en) | 2020-07-09 | 2020-07-09 | Detection circuit of alternating current input line and socket with detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111812553A true CN111812553A (en) | 2020-10-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010655195.9A Pending CN111812553A (en) | 2020-07-09 | 2020-07-09 | Detection circuit of alternating current input line and socket with detection circuit |
Country Status (1)
| Country | Link |
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| CN (1) | CN111812553A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114596762A (en) * | 2022-03-03 | 2022-06-07 | 华北电力大学 | Power electronic teaching experiment table wiring error checking equipment and method |
-
2020
- 2020-07-09 CN CN202010655195.9A patent/CN111812553A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114596762A (en) * | 2022-03-03 | 2022-06-07 | 华北电力大学 | Power electronic teaching experiment table wiring error checking equipment and method |
| CN114596762B (en) * | 2022-03-03 | 2023-10-24 | 华北电力大学 | Power electronic teaching experiment table wiring error checking equipment and method |
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