Leakage protection device
By introducing a leakage current sensor and a function control module into the circuit to control the connection and disconnection of the relay, the problem of unstable response timing in the existing technology is solved, stable control of the leakage current is achieved, and the stability of the system is improved.
Patent Information
- Application Number
- CN202422875197.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-25
- Publication Date
- 2025-10-14
- Estimated Expiration
- 2034-11-25
AI Technical Summary
In the prior art, the leakage judgment and control response timing of the circuit are not fixed, resulting in unstable system operation.
A leakage current sensor, a first relay, a second relay and a function control module are used to control the connection and disconnection of the relay through a control signal or a leakage signal to ensure that the control logic and response timing are fixed.
The stability of leakage current judgment and control is improved, and the reliability and stability of the system are improved.
Smart Images
Figure CN223436910U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the field of circuit detection, in particular to a leakage protection device. BACKGROUND
[0002] In the prior art, the circuit judges whether to leak electricity and controls the leakage through an MCU. The response timing of the MCU is not fixed, and the system is unstable. How to solve the above technical problems is considered by the person skilled in the art. CONTENT OF THE UTILITY MODEL
[0003] The present application provides a leakage protection device to solve the problem of how to improve the stability of the judgment and control of the leakage current.
[0004] The embodiment of the present application provides a leakage protection device, which comprises a leakage current sensor, a first relay, a second relay and a function control module. The leakage current sensor is used for monitoring the leakage current of a fire line and a zero line in real time. The first relay is connected in series with the fire line, and the first relay is used for connecting or disconnecting the fire line. The second relay is connected in series with the zero line, and the second relay is used for connecting or disconnecting the zero line. The function control module is connected with the leakage current sensor, the function control module receives a leakage signal of the leakage current sensor, the function control module comprises a control end and an output end, the control end is used for inputting a control signal, the output end is connected with the first relay and the second relay, and the output end outputs a high level according to the control signal or the leakage signal to control the first relay and the second relay to be connected, or outputs a low level to control the first relay and the second relay to be disconnected.
[0005] Compared with the prior art, the leakage protection device provided by the embodiment can control the first relay and the second relay to be connected or disconnected through the control signal of the function control module, or control the first relay and the second relay to be connected or disconnected through the leakage signal of the function control module, so that the control logic and the response timing are fixed, and the stability of the judgment and control of the leakage current is improved.
[0006] In a possible implementation, the control end comprises a first pin, the first pin is used for inputting a high level or a low level, and when the first pin inputs the low level, the output end outputs the low level to control the first relay and the second relay to be disconnected.
[0007] In a possible implementation, the control end further comprises a second pin, the second pin is used for inputting a high level or a low level, and when the first pin inputs the high level and the second pin inputs the low level, the output end outputs the high level to control the first relay and the second relay to be connected.
[0008] In a possible implementation, the control end further comprises a second pin for inputting a high level or a low level, when the first pin inputs a high level and the second pin inputs a high level, the output end controls the first relay and the second relay to be connected or disconnected according to the leakage current signal.
[0009] In a possible implementation, the control end further comprises a third pin for product self-checking when a line leakage occurs, so that the output end controls the first relay and the second relay to be disconnected.
[0010] In a possible implementation, the leakage protection device further comprises a current transformer arranged in the live line to detect a current value of the live line.
[0011] In a possible implementation, the leakage protection device further comprises a communication module for sending a connection or disconnection state of the first relay and the second relay.
[0012] In a possible implementation, the leakage protection device further comprises a signal lamp for lighting to display a connection state of the first relay and the second relay, or for being turned off to display a disconnection state of the first relay and the second relay. BRIEF DESCRIPTION OF DRAWINGS
[0013] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings in the embodiments will be briefly introduced as follows, and it should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be regarded as a limitation on the scope, and for those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.
[0014] Figure 1 The schematic diagram of the leakage protection device of an embodiment of the present application.
[0015] Main element symbol explanation:
[0016] 1, leakage protection device; 11, leakage current sensor; 12, first relay; 13, second relay; 14, function control module; 141, control end; 142, output end; 143, first pin; 144, second pin; 145, third pin; 146, power supply end; 15, current transformer; 16, communication module; 17, live line; 18, neutral line; 19, signal lamp. DETAILED DESCRIPTION
[0017] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application.
[0018] Some embodiments of the present application are described in detail. The following embodiments and features in the embodiments can be combined with each other without conflict.
[0019] Embodiments
[0020] Please refer to Figure 1 The present embodiment provides a leakage protection device 1, comprising a leakage current sensor 11, a first relay 12, a second relay 13 and a function control module 14. The leakage current sensor 11 is used to monitor the leakage current of the fire line 17 and the zero line 18 in real time. The first relay 12 is connected in series with the fire line 17, and the first relay 12 is used to connect or disconnect the fire line 17. The second relay 13 is connected in series with the zero line 18, and the second relay 13 is used to connect or disconnect the zero line 18. The function control module 14 is connected with the leakage current sensor 11, the function control module 14 receives the leakage signal of the leakage current sensor 11, the function control module 14 includes a control end 141 and an output end 142, the control end 141 is used to input a control signal, the output end 142 is connected with the first relay 12 and the second relay 13, and the output end 142 outputs a high level according to the control signal or the leakage signal to control the first relay 12 and the second relay 13 to be connected, or outputs a low level to control the first relay 12 and the second relay 13 to be disconnected.
[0021] The leakage protection device 1 provided by the present embodiment controls the first relay 12 and the second relay 13 to be connected or disconnected through the control signal of the function control module 14, or controls the first relay 12 and the second relay 13 to be connected or disconnected through the leakage signal of the function control module 14, so that the control logic and the response time sequence are fixed, and the stability of the judgment and control of the leakage current is improved.
[0022] In the present embodiment, the function control module 14 is composed of logic gates, the control end 141 of the function control module 14 is provided with a plurality of ports, the output end 142 of the function control module 14 is provided with one port, and the signal of the output end 142 is high level or low level. When the output end 142 outputs high level, the first relay 12 and the second relay 13 are connected; when the output end 142 outputs low level, the first relay 12 and the second relay 13 are disconnected.
[0023] In a possible implementation, the control end 141 includes a first pin 143 for inputting a high level or a low level, and when the first pin 143 inputs a low level, the output end 142 outputs a low level to control the first relay 12 and the second relay 13 to be disconnected.
[0024] In the embodiment, the first pin 143 is a SET pin, and when the SET pin inputs a low level, the output end 142 outputs a low level to control the first relay 12 and the second relay 13 to be disconnected.
[0025] In a possible implementation, the control end 141 further includes a second pin 144 for inputting a high level or a low level, and when the first pin 143 inputs a high level and the second pin 144 inputs a low level, the output end 142 outputs a high level, and the first relay 12 and the second relay 13 are connected.
[0026] In the embodiment, the second pin 144 is an ECU pin, and when the SET pin inputs a high level and the SET pin inputs a low level, the output end 142 outputs a high level, and the first relay 12 and the second relay 13 are connected.
[0027] In a possible implementation, the control end 141 further includes a second pin 144 for inputting a high level or a low level, and when the first pin 143 inputs a high level and the second pin 144 inputs a high level, the output end 142 controls the first relay 12 and the second relay 13 to be connected or disconnected according to the leakage signal.
[0028] In the embodiment, when the SET pin inputs a high level and the SET pin inputs a high level, the leakage current sensor 11 takes control of the first relay 12 and the second relay 13. When the leakage current sensor 11 detects leakage, the output end 142 of the function control module 14 outputs a low level, so that the first relay 12 and the second relay 13 are disconnected; when the leakage current sensor 11 does not detect leakage, the output end 142 of the function control module 14 outputs a high level, so that the first relay 12 and the second relay 13 are closed.
[0029] In a possible implementation, the control end 141 further includes a third pin 145 for product self-checking when line leakage occurs, so that the output end 142 controls the first relay 12 and the second relay 13 to be disconnected.
[0030] In the embodiment, the third pin 145 is a TEST pin, and the SET pin is used to simulate that leakage current occurs when charging, and the leakage current sensor 11 takes over the control of the first relay 12 and the second relay 13, and the leakage current sensor 11 detects leakage, and the output end 142 of the function control module 14 outputs low level, so that the first relay 12 and the second relay 13 are disconnected.
[0031] The function control module 14 further comprises a power supply end 146, which is used to input 12V high level or 5V low level, and the power supply end 146 is connected with the first relay 12 and the second relay 13 respectively, so as to supply power to the first relay 12 and the second relay 13.
[0032] In a possible implementation, the leakage protection device 1 further comprises a current transformer 15, which is arranged on the live wire 17 to detect the current value of the live wire 17.
[0033] In the embodiment, the current transformer 15 is used to detect whether the live wire 17 is in the disconnected state, and if the live wire 17 has current passing through, the current value at this time is output, and if the output current value is zero, it indicates that the circuit at this time is in the disconnected state.
[0034] In a possible implementation, the leakage protection device 1 further comprises a communication module 16, which is used to send the connected or disconnected state of the first relay 12 and the second relay 13.
[0035] In the embodiment, the communication module 16 sends the working state of the leakage protection device 1 in real time, so as to facilitate remote control and monitoring.
[0036] In a possible implementation, the leakage protection device 1 further comprises a signal lamp 19, which is used to light up to show the connected state of the first relay 12 and the second relay 13, or to be turned off to show the disconnected state of the first relay 12 and the second relay 13.
[0037] In the embodiment, the signal lamp 19 is used to visually observe the connected or disconnected state of the first relay 12 and the second relay 13.
[0038] The above embodiments are only used to illustrate the technical solutions of the present application and not to limit the present application. Although the present application has been described in detail with reference to the above preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present application.
Claims
1. A leakage protection device, characterized in that: include: Leakage current sensor, used to monitor the leakage current of the live wire and the neutral wire in real time; a first relay connected in series with the live wire, the first relay being used to connect or disconnect the live wire; a second relay connected in series with the neutral line, the second relay being used to connect or disconnect the neutral line; A function control module is connected to the leakage current sensor, the function control module receives the leakage signal of the leakage current sensor, the function control module includes a control end and an output end, the control end is used to input the control signal, the output end is connected to the first relay and the second relay, and the output end outputs a high level to control the first relay and the second relay to be connected, or outputs a low level to control the first relay and the second relay to be disconnected according to the control signal or the leakage signal.
2. The leakage protection device according to claim 1, characterized in that: The control end includes a first pin, the first pin is used to input a high level or a low level, and when the first pin inputs a low level, the output end outputs a low level to control the first relay and the second relay to be disconnected.
3. The leakage protection device according to claim 2, characterized in that: The control end further includes a second pin, which is used to input a high level or a low level. When the first pin inputs a high level and the second pin inputs a low level, the output end outputs a high level to control the first relay and the second relay to be connected.
4. The leakage protection device according to claim 2, characterized in that: The control end further includes a second pin, which is used to input a high level or a low level. When the first pin inputs a high level and the second pin inputs a high level, the output end controls the first relay and the second relay to be connected or disconnected according to the leakage signal.
5. The leakage protection device according to claim 1, characterized in that: The control end further includes a third pin, and the third pin is used for product self-test when the circuit leaks electricity, so that the output end controls the first relay and the second relay to be disconnected.
6. The leakage protection device according to claim 1, characterized in that: The leakage protection device further includes a current transformer, which is provided on the live wire to detect the current value of the live wire.
7. The leakage protection device according to claim 1, characterized in that: The leakage protection device further includes a communication module, and the communication module is used to send the connection or disconnection status of the first relay and the second relay.
8. The leakage protection device according to claim 7, characterized in that: The leakage protection device further includes a signal light, which is configured to light up to indicate a connected state between the first relay and the second relay, or to go out to indicate a disconnected state between the first relay and the second relay.