CN216215858U - Take earth leakage detection protection device of excessive pressure function - Google Patents
Take earth leakage detection protection device of excessive pressure function Download PDFInfo
- Publication number
- CN216215858U CN216215858U CN202122519404.XU CN202122519404U CN216215858U CN 216215858 U CN216215858 U CN 216215858U CN 202122519404 U CN202122519404 U CN 202122519404U CN 216215858 U CN216215858 U CN 216215858U
- Authority
- CN
- China
- Prior art keywords
- circuit
- resistor
- leakage detection
- leakage
- diode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
The utility model relates to the technical field of electric control, in particular to a leakage detection protection device with an overvoltage function, which comprises a power supply circuit, a voltage reduction rectification circuit, a leakage detection circuit and a silicon controlled switch circuit which are sequentially connected; the leakage detection circuit is characterized by also comprising a leakage induction circuit, wherein one end of the leakage induction circuit is connected with the voltage reduction rectifying circuit, and the other end of the leakage induction circuit is connected with the leakage detection circuit; an overvoltage detection circuit is also connected between the leakage detection circuit and the silicon controlled switch circuit; the power supply circuit comprises a phase line L and a zero line N which are respectively connected with the voltage reduction rectification circuit; the power supply circuit is provided with a trip coil, the silicon controlled switch circuit is connected with the trip coil, and when the silicon controlled switch circuit is conducted, the trip coil is conducted to the ground to form a loop with the silicon controlled switch circuit. The device has the advantages of simple structure, low cost and high detection efficiency, and can realize overvoltage protection by detecting the range of input voltage.
Description
Technical Field
The utility model relates to the technical field of electric control, in particular to an electric leakage detection protection device with an overvoltage function.
Background
Along with the popularization of electric vehicles, the popularization of corresponding vehicle charging electric devices brings great convenience to vehicles, but in the electricity utilization process, because of the defects of electric equipment or improper use and the like, the phenomenon of electricity leakage of the charging equipment can be caused, and the damage is brought to the property and life safety of people, such as: spark generated by electric leakage of the charging pile can cause fire and explosion, and personal casualties can be caused by electric shock, so that the electric leakage detection of the charging pile is very important. In addition, the thyristor switch involved in the existing earth leakage protection device is easily broken down and damaged under the condition of high voltage, and great maintenance cost is caused. At present, can be used to detect the electric leakage and have overvoltage protection's device, most peripheral circuit is complicated, and original paper and manufacturing cost are also very high, because earth-leakage protector's appearance is all smaller, and the space of reserving is little, also brings certain puzzlement for the overall arrangement of component. Therefore, a design scheme with low cost and simple structure is urgently needed.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the problems of the prior art and provides a leakage detection protection device with an overvoltage function, wherein a leakage signal in a circuit is converted into a voltage signal through a leakage induction circuit and is transmitted to a leakage of the leakage detection circuit, the leakage signal is filtered, amplified and rectified to obtain a direct current voltage which is input to a silicon controlled switch, the conduction between an anode and a cathode of the silicon controlled switch is triggered, an electromagnet is conducted to the ground to form a loop with the silicon controlled switch, and an external mechanism is triggered to be switched off through a tripping coil.
The above purpose is realized by the following technical scheme:
a leakage detection protection device with an overvoltage function comprises a power supply circuit, a voltage reduction rectification circuit, a leakage detection circuit and a silicon controlled switch circuit which are sequentially connected; the leakage detection circuit is characterized by also comprising a leakage induction circuit, wherein one end of the leakage induction circuit is connected with the voltage reduction rectifying circuit, and the other end of the leakage induction circuit is connected with the leakage detection circuit; an overvoltage detection circuit is also connected between the leakage detection circuit and the silicon controlled switch circuit; the power supply circuit comprises a phase line L and a zero line N which are respectively connected with the voltage reduction rectification circuit; the power supply circuit is provided with a trip coil, the silicon controlled switch circuit is connected with the trip coil, and when the silicon controlled switch circuit is conducted, the trip coil is conducted to the ground to form a loop with the silicon controlled switch circuit.
Further, the buck rectifying circuit includes a bridge rectifying circuit including a first diode D1, a second diode D2, a third diode D3, and a fourth diode D4, and a buck circuit including a third resistor R3, a fourth resistor R4, and a fifth resistor R5 connected in series.
Further, an anode of the first diode D1 and a cathode of the second diode D2 are connected as a first end of the bridge rectifier circuit, an anode of the second diode D2 and an anode of the fourth diode D4 are connected as a second end of the bridge rectifier circuit, a cathode of the fourth diode D4 and an anode of the third diode D3 are connected as a third end of the bridge rectifier circuit, and a cathode of the fourth diode D4 and a cathode of the first diode D1 are connected as a fourth end of the bridge rectifier circuit.
Further, the rectifier circuit further comprises a piezoresistor MOV, wherein one side of the piezoresistor MOV is connected with the power circuit, and the other side of the piezoresistor MOV is respectively connected with the first end and the third end of the bridge rectifier circuit.
Furthermore, the leakage detection circuit further comprises a ninth resistor R9, wherein one end of the ninth resistor R9 is connected with the fourth end of the bridge rectifier circuit, and the other end of the ninth resistor R9 is connected with the leakage detection circuit.
Further, the leakage inductance circuit comprises a zero sequence current transformer (ZCT), a first resistor R1, a bidirectional diode D6, a second resistor R2, a first capacitor C1 and a second capacitor C2 which are connected in sequence; the zero sequence current transformer (ZCT) clamps the induced leakage current through the bidirectional diode D6, filters the leakage current through the second capacitor C2, and inputs the leakage current into the leakage detection circuit after the leakage current is converted by the first resistor R1 and the second resistor R2.
Further, the overvoltage detection circuit comprises a sixth resistor R6, a seventh resistor R7, the eighth resistor R8 and a ninth capacitor C9 which are sequentially connected with the leakage detection circuit.
Further, the silicon controlled switch circuit comprises a silicon controlled switch SCR, the cathode of the silicon controlled switch SCR is respectively connected with the voltage reduction rectification circuit and the electric leakage detection circuit, and the anode of the silicon controlled switch SCR is connected with the trip coil.
Further, the leakage detection circuit is a leakage chip G4601.
The test button circuit comprises a test button SW2, one end of the test button SW2 is connected with the leakage inductance circuit through a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14 and a fifteenth resistor R15, and the other end of the test button SW 3578 is connected with the zero line N of the power supply circuit, so that the working state of the circuit can be detected.
Advantageous effects
According to the utility model, the alternating voltage is converted into the direct voltage through the voltage reduction rectification circuit and is transmitted to the leakage detection circuit, and the power supply circuit, the voltage reduction rectification circuit, the leakage detection circuit, the overvoltage detection circuit, the leakage detection circuit and the silicon controlled switch circuit are connected with one another, so that the purpose of accurately detecting leakage is achieved, and the voltage can be comprehensively monitored, controlled and protected. The device has the advantages of simple structure, low cost and high detection efficiency, and can achieve the overvoltage detection function and realize overvoltage leakage protection by adding the overvoltage detection circuit between the leakage detection circuit and the silicon controlled switch circuit.
Drawings
Fig. 1 is a schematic structural diagram of an electric leakage detection protection device with an overvoltage function according to the present invention;
fig. 2 is a circuit diagram of the leakage detection protection device with overvoltage function according to the utility model.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples.
As shown in fig. 1 and 2, an electric leakage detection protection device with an overvoltage function includes a power supply circuit, a step-down rectification circuit, an electric leakage detection circuit, and a thyristor switch circuit, which are connected in sequence; the leakage detection circuit is characterized by also comprising a leakage induction circuit, wherein one end of the leakage induction circuit is connected with the voltage reduction rectifying circuit, and the other end of the leakage induction circuit is connected with the leakage detection circuit; an overvoltage detection circuit is also connected between the leakage detection circuit and the silicon controlled switch circuit; the power supply circuit comprises a phase line L and a zero line N which are respectively connected with the voltage reduction rectification circuit; the power supply circuit is provided with a trip coil, the silicon controlled switch circuit is connected with the trip coil, and when the silicon controlled switch circuit is conducted, the trip coil is conducted to the ground to form a loop with the silicon controlled switch circuit. Specifically, when the voltage in the circuit is too high and exceeds the normal power grid voltage to reach 287V, the overvoltage detection circuit generates a signal, the leakage detection chip generates a signal, and the silicon controlled switch circuit forms a loop to generate protection.
The buck rectifying circuit in this embodiment includes a bridge rectifying circuit including a first diode D1, a second diode D2, a third diode D3, and a fourth diode D4, and a buck circuit including a third resistor R3, a fourth resistor R4, and a fifth resistor R5 connected in series.
Specifically, an anode of the first diode D1 and a cathode of the second diode D2 are connected as a first end of the bridge rectifier circuit, an anode of the second diode D2 and an anode of the fourth diode D4 are connected as a second end of the bridge rectifier circuit, a cathode of the fourth diode D4 and an anode of the third diode D3 are connected as a third end of the bridge rectifier circuit, and a cathode of the fourth diode D4 and a cathode of the first diode D1 are connected as a fourth end of the bridge rectifier circuit.
The voltage reduction circuit further comprises a ninth resistor R9, one end of the ninth resistor R9 is connected with the fourth end of the bridge rectifier circuit, and the other end of the ninth resistor R9 is connected with the leakage detection circuit.
The leakage detecting circuit used in the present apparatus is a leakage chip G4601.
The device is optimized by further comprising a piezoresistor MOV, wherein one side of the piezoresistor MOV is connected with the power circuit, and the other side of the piezoresistor MOV is respectively connected with the first end and the third end of the bridge rectifier circuit. The electric supply is added between a phase line L and a zero line N of the power supply, the resistance MOV is used for protecting the circuit from high-voltage breakdown, and the voltage reduction rectifying circuit provides stable direct-current voltage for a chip in the electric leakage detection circuit.
As an optimization of the leakage inductance circuit, the leakage inductance circuit comprises a zero sequence current transformer (ZCT), a first resistor R1, a bidirectional diode D6, a second resistor R2, a first capacitor C1 and a second capacitor C2 which are connected in sequence; the zero sequence current transformer (ZCT) clamps the induced leakage current through the bidirectional diode D6, filters the leakage current through the second capacitor C2, and inputs the leakage current into the No. 2 and No. 3 pins of a leakage detection chip in the leakage detection circuit after being converted by the first resistor R1 and the second resistor R2. The induced leakage signal is amplified, filtered, amplified and rectified by the leakage detection circuit to obtain a direct current voltage which passes through a pin 9 of the leakage detection chip and is input into the silicon controlled switch circuit.
The silicon controlled switch circuit comprises a silicon controlled switch SCR, the cathode of the silicon controlled switch SCR is respectively connected with the voltage reduction rectifying circuit and the electric leakage detection circuit, and the anode of the silicon controlled switch SCR is connected with the trip coil through a second diode D2.
The overvoltage detection circuit in the device comprises a sixth resistor R6, a seventh resistor R7, an eighth resistor R8 and a ninth capacitor C9 which are sequentially connected with the leakage detection circuit. When overvoltage voltage exists, the 8 th pin of the leakage detection chip is at high level, the leakage detection chip outputs the high level to trigger the conduction between the anode and the cathode of the silicon controlled switch SCR, so that a tripping coil in the voltage reduction rectification circuit is conducted to the ground to form a loop with the silicon controlled switch SCR, and an external mechanism is triggered to open a brake through the tripping coil.
As a further optimization of the device, the device also comprises a test button circuit which comprises a test button SW2, one end of the test button SW2 is connected with the leakage inductance circuit through a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14 and a fifteenth resistor R15, and the other end of the test button SW is connected with the zero line N of the power supply circuit, so as to detect the working state of the circuit.
The above description is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be made by one skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A leakage detection protection device with an overvoltage function is characterized by comprising a power supply circuit, a voltage reduction rectifying circuit, a leakage detection circuit and a silicon controlled switch circuit which are sequentially connected; the leakage detection circuit is characterized by also comprising a leakage induction circuit, wherein one end of the leakage induction circuit is connected with the voltage reduction rectifying circuit, and the other end of the leakage induction circuit is connected with the leakage detection circuit; an overvoltage detection circuit is also connected between the leakage detection circuit and the silicon controlled switch circuit; the power supply circuit comprises a phase line (L) and a zero line (N) which are respectively connected with the voltage reduction rectification circuit; the power supply circuit is provided with a trip coil, the silicon controlled switch circuit is connected with the trip coil, and when the silicon controlled switch circuit is conducted, the trip coil is conducted to the ground to form a loop with the silicon controlled switch circuit.
2. The earth leakage detection protection device with overvoltage function as claimed in claim 1, wherein said buck rectifying circuit comprises a bridge rectifying circuit composed of a first diode (D1), a second diode (D2), a third diode (D3) and a fourth diode (D4), and a buck circuit composed of a third resistor (R3), a fourth resistor (R4) and a fifth resistor (R5) connected in sequence.
3. The earth leakage detection protection device with overvoltage function as claimed in claim 2, wherein the anode of said first diode (D1) and the cathode of said second diode (D2) are connected as the first end of said bridge rectifier circuit, the anode of said second diode (D2) and the anode of said fourth diode (D4) are connected as the second end of said bridge rectifier circuit, the cathode of said fourth diode (D4) and the anode of said third diode (D3) are connected as the third end of said bridge rectifier circuit, the cathode of said fourth diode (D4) and the cathode of said first diode (D1) are connected as the fourth end of said bridge rectifier circuit.
4. A leakage detection protection device with overvoltage function according to claim 3, further comprising a voltage dependent resistor (MOV), wherein one side of said MOV is connected to said power circuit, and the other side is connected to the first terminal and the third terminal of said bridge rectifier circuit.
5. A leakage detection protection device with overvoltage function according to claim 3, further comprising a ninth resistor (R9), wherein one end of the ninth resistor (R9) is connected to the fourth end of the bridge rectifier circuit, and the other end is connected to the leakage detection circuit.
6. The leakage detection protection device with overvoltage function as claimed in claim 1, wherein the leakage induction circuit comprises a zero sequence current transformer (ZCT), a first resistor (R1), a bidirectional diode (D6), a second resistor (R2), a first capacitor (C1) and a second capacitor (C2) which are connected in sequence; the zero sequence current transformer (ZCT) clamps the induced leakage current through the bidirectional diode (D6), filters the leakage current through the second capacitor (C2), and inputs the leakage current into the leakage detection circuit after being converted by the first resistor (R1) and the second resistor (R2).
7. A leakage detection protection device with overvoltage function according to claim 1, characterized in that the overvoltage detection circuit comprises a sixth resistor (R6), a seventh resistor (R7), an eighth resistor (R8) and a ninth capacitor (C9) connected in series with the leakage detection circuit.
8. The leakage detection and protection device with overvoltage function according to claim 1, wherein the thyristor switch circuit comprises a thyristor Switch (SCR), a cathode of the thyristor Switch (SCR) is connected to the step-down rectification circuit and the leakage detection circuit, respectively, and an anode of the thyristor Switch (SCR) is connected to the trip coil.
9. A leakage detection protection device with overvoltage function according to claim 1, characterized in that the leakage detection circuit is a leakage chip G4601.
10. The earth leakage detection protection device with overvoltage function as claimed in claim 1, further comprising a test button circuit, said test button circuit comprising a test button SW2, one end of said test button SW2 is connected to said leakage inductance circuit through a tenth resistor (R10), an eleventh resistor (R11), a twelfth resistor (R12), a thirteenth resistor (R13), a fourteenth resistor (R14), a fifteenth resistor (R15), and the other end is connected to said neutral line (N) of said power circuit, for detecting the operating state of the circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122519404.XU CN216215858U (en) | 2021-10-19 | 2021-10-19 | Take earth leakage detection protection device of excessive pressure function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122519404.XU CN216215858U (en) | 2021-10-19 | 2021-10-19 | Take earth leakage detection protection device of excessive pressure function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216215858U true CN216215858U (en) | 2022-04-05 |
Family
ID=80884666
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122519404.XU Active CN216215858U (en) | 2021-10-19 | 2021-10-19 | Take earth leakage detection protection device of excessive pressure function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216215858U (en) |
-
2021
- 2021-10-19 CN CN202122519404.XU patent/CN216215858U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN202259980U (en) | Plug with ground wire live protection mechanism | |
| CN203722205U (en) | Overvoltage and electric leakage protection circuit | |
| CN102354869B (en) | Electricity leakage protection plug with alarm device | |
| CN102290689B (en) | Earth leakage protection plug | |
| CN216215858U (en) | Take earth leakage detection protection device of excessive pressure function | |
| CN103066456B (en) | Protective plug capable of checking leakage of electricity | |
| CN202524074U (en) | Secondary open circuit protector of current transformer | |
| CN216215857U (en) | Leakage protection device for detecting A-type leakage current | |
| CN219554577U (en) | Leakage detection protection device with time delay function | |
| CN208272611U (en) | A kind of detection and protection apparatus for leakage with delay function | |
| CN206099298U (en) | Power supply monitoring circuit | |
| CN204992530U (en) | Three -phase leakage protection circuit | |
| CN216774266U (en) | Take surge protector isolated plant of excessive pressure function | |
| CN217282191U (en) | Leakage protection device based on half-wave rectification | |
| CN212010886U (en) | Three-phase open-phase protection and leakage circuit breaker | |
| CN216816786U (en) | Special surge protector device for detecting non-sine wave current | |
| CN203326559U (en) | Electric leakage protection plug circuit | |
| CN217590244U (en) | Special surge protector device with time delay function | |
| CN103474955A (en) | Earth leakage protection plug | |
| CN205960628U (en) | Current leakage protection device | |
| CN209786777U (en) | A-type leakage protection circuit with wide voltage range | |
| CN102842889A (en) | Highly sensitive ground wire with voltage protector | |
| CN203352155U (en) | Microcomputer monitoring protecting device for current transformer | |
| CN114243631A (en) | Take surge protector isolated plant of excessive pressure function | |
| CN102324718A (en) | Power leakage protector |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |