Leakage protection device
By designing the acquisition module, control module, and discharge module of the leakage current protection device, the problem of continuous triggering caused by the current flow of the trip unit during the L-pole surge current test of RCBO was solved, thereby reducing circuit energy consumption and extending service life.
Patent Information
- Application Number
- CN202423119580.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-17
- Publication Date
- 2025-11-18
- Estimated Expiration
- 2034-12-17
AI Technical Summary
During the surge current test of the L-pole, the current in the trip unit of the single-pole RCBO flows through the N-pole, causing the RCBO to be continuously triggered and reducing its service life.
Design a leakage current protection device, including a data acquisition module, a control module, a discharge module and a tripping module. After the tripping module is tripped by the control module, the current is discharged through the discharge module to avoid repeated triggering.
This effectively prevents the control module from being repeatedly triggered by residual current, reducing circuit energy consumption and extending its service life.
Smart Images
Figure CN223567301U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of leakage protection, and particularly relates to a surge voltage testing device. BACKGROUND
[0002] Single-pole contact residual current breaker with overcurrent protection (RCBO) refers to RCBO with only one pole, which usually controls only the firewire and does not control the zero line. It has the following main functions:
[0003] Leakage protection: When detecting leakage current, single-pole RCBO will quickly cut off the power supply to prevent electric shock caused by current passing through the human body.
[0004] Overload protection: When the current in the circuit exceeds the set value, single-pole RCBO will automatically disconnect the circuit to prevent overheating of the wire and damage to the equipment.
[0005] Short circuit protection: In the event of a short circuit fault, single-pole RCBO can immediately cut off the circuit to reduce the risk of equipment damage and fire.
[0006] When using external equipment to test the surge current and residual current of the L pole, the RCBO circuit will produce a tripping action, and the residual current will exist, causing the leakage protection device in the circuit to continuously trigger. SUMMARY
[0007] Therefore, the utility model provides a leakage protection device to solve the problem of continuous triggering of leakage protection caused by residual current in the circuit.
[0008] The utility model provides a leakage protection device, which comprises a collection module, a control module, a discharge module and a tripping module. The input end of the collection module collects the residual current signal of the power supply to be protected. The output end of the collection module is connected to the input end of the control module. The first output end of the control module is connected to the first end of the discharge module. The second output end of the control module is connected to the second end of the discharge module and the control end of the tripping module. The first end of the control module is connected to the third end of the discharge module and the first end of the tripping module and then grounded. The control module is used to output a trigger signal and a discharge signal when determining that there is residual current in the power supply to be protected based on the output signal of the collection module. The second end of the tripping module is connected to the control end of the power supply to be protected. The tripping module is used to cut off the output of the power supply to be protected based on the trigger signal. The discharge module is used to discharge the residual current based on the discharge signal.
[0009] The utility model provides a leakage protection device, when the residual current exists in the power supply to be protected, the control module controls the tripping module to trip and cut off the circuit of the power supply to be protected, and the current in the tripping module can flow into the collection module again through the power supply to be protected, so that the control module repeatedly triggers the tripping action, therefore, the utility model discloses a control module controls the tripping module to trip, and the residual current in the control circuit is discharged through the discharge module, avoids the control module under the action of the residual current repeatedly triggering, reduces the circuit energy consumption, improves the service life.
[0010] In an alternative embodiment, the collection module is a current transformer.
[0011] In an alternative embodiment, the discharge module comprises a switching unit and a discharge unit, wherein the first end of the discharge unit is connected to the first output end of the control module and the first end of the switching unit, the second end of the discharge unit is connected to the second end of the switching unit and the first end of the control module; the third end of the switching unit is connected to the second output end of the control module; the switching unit is used to turn on based on the discharge signal, so that the discharge unit discharges the residual current.
[0012] In an alternative embodiment, the discharge unit comprises a first capacitor, and the first end and the second end of the first capacitor are respectively connected to the first output end and the first end of the control module.
[0013] In an alternative embodiment, the switching unit comprises a controllable switch, a first resistor and a second capacitor, wherein the first end of the controllable switch is connected to the first output end of the control module, the second end of the controllable switch is connected to the first end of the control module and the first end of the second capacitor, the control end of the controllable switch is connected to the first end of the first resistor and the second end of the second capacitor; the second end of the first resistor is connected to the second output end of the control module.
[0014] In an alternative embodiment, the controllable switch is an insulated gate field effect transistor or a triode.
[0015] In an alternative embodiment, the tripping module comprises a filtering unit and a tripping unit, wherein the first end of the filtering unit is connected to the second output end of the control module, the second end of the filtering unit is connected to the first end of the control module and the first end of the tripping unit, the third end of the filtering unit is connected to the control end of the tripping unit; the second end of the tripping unit is connected to the control end of the power supply to be protected, and the tripping unit is used to cut off the output of the power supply to be protected based on the trigger signal.
[0016] In an alternative embodiment, the filtering unit comprises a second resistor and a third capacitor, wherein the first end of the second resistor is connected to the second output end of the control module, the second end of the second resistor is connected to the first end of the third capacitor and the control end of the tripping unit; the second end of the third capacitor is connected to the first end of the control module.
[0017] In an alternative embodiment, the tripping unit comprises a tripper and a trigger switch, wherein the control end of the trigger switch is connected with the third end of the filter unit, the first end of the trigger switch is connected with the first end of the control module, the second end of the trigger switch is connected with the first end of the tripper, and the second end of the tripper is connected with the control end of the power supply to be protected. BRIEF DESCRIPTION OF DRAWINGS
[0018] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or the prior art description. Obviously, the drawings described below are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.
[0019] Figure 1 is a component diagram of the leakage protection device according to the embodiment of the present application;
[0020] Figure 2 is a specific circuit structure diagram of the leakage protection device according to the embodiment of the present application;
[0021] Figure 3 is another specific circuit structure diagram of the switch unit according to the embodiment of the present application;
[0022] Figure 4 is another specific circuit structure diagram of the switch unit according to the embodiment of the present application. DETAILED DESCRIPTION
[0023] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.
[0024] In the description of the utility model, it needs to explain, the term "center", "upper", "lower", "left", "right", "vertical", "horizontal", "internal", "external" and so on indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawing, only for the convenience of describing the utility model and simplifying the description, and not indicate or imply that the device or element indicated must have a particular orientation, a particular orientation and operation, therefore, it cannot be understood as a limitation on the utility model. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.
[0025] In the description of the utility model, it needs to explain, the term "center", "upper", "lower", "left", "right", "vertical", "horizontal", "internal", "external" and so on indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawing, only for the convenience of describing the utility model and simplifying the description, and not indicate or imply that the device or element indicated must have a particular orientation, a particular orientation and operation, therefore, it cannot be understood as a limitation on the utility model. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.
[0026] In addition, the technical features involved in the different embodiments of the utility model described below can be combined with each other as long as there is no conflict.
[0027] In the related art, during the L pole surge current test of the RCBO of the single pole contact, when abnormal tripping occurs, the L pole is disconnected, the single pole current in the tripping device will flow through the N pole, and be collected as residual current by the mutual inductor, resulting in continuous triggering of the RCBO, reducing the service life.
[0028] Therefore, the embodiment provides an electric leakage protection device, as shown in the figure, comprising: an acquisition module 1, a control module 2, a discharge module 3 and a tripping module 4, wherein the power supply to be protected can include the live wire L and the neutral wire N of the main circuit. Figure 1
[0029] Figure 1 In the description of the utility model, it needs to explain, the term "center", "upper", "lower", "left", "right", "vertical", "horizontal", "internal", "external" and so on indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawing, only for the convenience of describing the utility model and simplifying the description, and not indicate or imply that the device or element indicated must have a particular orientation, a particular orientation and operation, therefore, it cannot be understood as a limitation on the utility model. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.
[0030] Specifically, Figure 1 In the specific implementation, the collection module 1 is configured to acquire the residual current in the live wire L and the neutral wire N of the power supply to be protected during the surge current test and deliver the residual current to the control module 2; the control module 2 is configured to output a trigger signal and a discharge signal when the residual current in the power supply to be protected is determined based on the output residual current signal of the collection module 1, so that the trip module 4 cuts off the output of the power supply to be protected based on the trigger signal, and after the output of the power supply to be protected is cut off, the residual current in the discharge circuit is discharged by the discharge module 3 based on the discharge signal, so as to prevent the residual current from flowing back to the input end of the collection module 1 through the N pole of the protected device and causing the control module 2 to be triggered mistakenly.
[0031] The leakage protection device provided by the embodiment can prevent the control module from being triggered repeatedly under the action of the residual current, reduce the energy consumption of the circuit, and prolong the service life.
[0032] Optionally, Figure 1 In the specific implementation, the collection module 1 is a current transformer.
[0033] In some optional implementations, the embodiment is applied to leakage protection of L-pole surge current test of a single-pole contact RCBO, and only the live wire L is cut off when leakage occurs, and the neutral wire N is not cut off. Figure 2 As shown in the figure, the discharge module 3 comprises a switching unit 31 and a discharge unit 32, wherein the first end of the discharge unit 32 is connected with the first output end of the control module 2 and the first end of the switching unit 31, the second end of the discharge unit 32 is connected with the second end of the switching unit 31 and the first end of the control module 2, and the third end of the switching unit 31 is connected with the second output end of the control module 2; the switching unit 31 is configured to be turned on based on the discharge signal, so that the discharge unit 32 discharges the residual current.
[0034] Specifically, Figure 3 In the specific implementation, the discharge unit 32 comprises a first capacitor C3, and the first end and the second end of the first capacitor C3 are connected with the first output end and the first end of the control module 2, respectively; the switching unit 31 comprises a controllable switch Q2, a first resistor R4 and a second capacitor C4, wherein the first end of the controllable switch Q2 is connected with the first output end of the control module 2, the second end of the controllable switch Q2 is connected with the first end of the control module 2 and the first end of the second capacitor C4, the control end of the controllable switch Q2 is connected with the first end of the first resistor R4 and the second end of the second capacitor C4, and the second end of the first resistor R4 is connected with the second output end of the control module 2.
[0035] Optionally, the controllable switch Q2 can be Figure 2 The insulated gate field effect transistor shown in the figure can also be Figure 3 and Figure 4 The triode shown in the figure, Figure 4 The base of the triode in the figure is also connected with the resistor R5 for current limiting.
[0036] In some optional embodiments, as shown in the figure, Figure 2 The triode shown in the figure,
[0037] Specifically, Figure 4 The filter unit 41 includes a second resistor R3 and a third capacitor C5, wherein the first end of the second resistor R3 is connected with the second output end of the control module 2, the second end of the second resistor R3 is connected with the first end of the third capacitor C5 and the control end of the tripping unit 42; the second end of the third capacitor C5 is connected with the first end of the control module 2. The tripping unit 42 includes a tripping device K1 and a trigger switch Q1, wherein the control end of the trigger switch Q1 is connected with the third end of the filter unit 41, the first end of the trigger switch Q1 is connected with the first end of the control module 2, and the second end of the trigger switch Q1 is connected with the first end of the tripping device K1; the second end of the tripping device K1 is connected with the control end of the protected power supply (i.e. the control end of the switch K on the live line L).
[0038] Specifically, Figure 4 In the specific embodiment, when the control module 1 identifies that there is a residual current in the live line L and the neutral line N through the current transformer, the OS pin of the control module 1 outputs a trigger signal, the trigger signal is input to the control end of the trigger switch Q1 through the R3 to make the Q1 conductive, so that the tripping current generated by the tripping device K1 coil makes the switch K on the live line L open, cutting off the live line in the protected power supply. In order to avoid the current in the tripping device K1 flowing back to the neutral line N through other external devices and flowing into the current transformer, the DLY pin of the control module 2 also outputs a discharge signal, which is input to the control end of the controllable switch Q2 through the first resistor R4 and the second capacitor C4 to make the controllable switch Q2 conductive, and the residual current in the circuit is discharged to the ground through the first capacitor C3, avoiding the control module 2 from triggering the leakage protection due to the residual current.
[0039] Although the embodiments of the present application are described in conjunction with the drawings, various modifications and changes can be made by those skilled in the art without departing from the spirit and scope of the present application, and such modifications and changes fall within the scope of the appended claims.
Claims
1. An electric leakage protection device, characterized by, The leakage protection device comprises a collection module, a control module, a leakage module and a tripping module, wherein: the input end of the collection module collects a residual current signal of a power supply to be protected, and the output end of the collection module is connected with the input end of the control module; the first output end of the control module is connected with the first end of the leakage module, the second output end of the control module is connected with the second end of the leakage module and the control end of the tripping module, and the first end of the control module is connected with the third end of the leakage module and the first end of the tripping module and then grounded, the control module is used for outputting a trigger signal and a leakage signal when determining that there is a residual current in the power supply to be protected based on the output signal of the collection module; the second end of the tripping module is connected with the control end of the power supply to be protected, and the tripping module is used for cutting off the output of the power supply to be protected based on the trigger signal; the leakage module is used for leaking the residual current based on the leakage signal.
2. The leakage protection device according to claim 1, wherein: the collection module is a current transformer. The leakage module comprises a switch unit and a leakage unit, wherein:
3. The ground fault protection device of claim 1, wherein, the first end of the leakage unit is connected with the first output end of the control module and the first end of the switch unit, and the second end of the leakage unit is connected with the second end of the switch unit and the first end of the control module; the third end of the switch unit is connected with the second output end of the control module; the switch unit is used for turning on based on the leakage signal, so that the leakage unit leaks the residual current. The leakage unit comprises a first capacitor, 4. The ground fault protection device of claim 3, wherein, the first end and the second end of the first capacitor are respectively connected with the first output end and the first end of the control module. The switch unit comprises a controllable switch, a first resistor and a second capacitor, wherein:
5. The ground fault protection device of claim 3, wherein, the first end of the controllable switch is connected with the first output end of the control module, the second end of the controllable switch is connected with the first end of the control module and the first end of the second capacitor, and the control end of the controllable switch is connected with the first end of the first resistor and the second end of the second capacitor; the second end of the first resistor is connected with the second output end of the control module.
6. The leakage protection device according to claim 5, wherein: the controllable switch is an insulated gate field effect transistor or a triode. The tripping module comprises a filter unit and a tripping unit, wherein:
7. The ground fault protection device of claim 1, wherein, the first end of the filter unit is connected with the second output end of the control module, the second end of the filter unit is connected with the first end of the control module and the first end of the tripping unit, and the third end of the filter unit is connected with the control end of the tripping unit; the second end of the tripping unit is connected with the control end of the power supply to be protected, and the tripping unit is used for cutting off the output of the power supply to be protected based on the trigger signal. The filter unit comprises a second resistor and a third capacitor, wherein:
8. The ground fault protection device of claim 7, wherein, the first end of the second resistor is connected with the second output end of the control module, and the second end of the second resistor is connected with the first end of the third capacitor and the control end of the tripping unit. The second end of the third capacitor is connected with the first end of the control module.
9. The ground fault protection device of claim 7, wherein, The tripping unit comprises a tripper and a trigger switch, wherein, The control end of the trigger switch is connected with the third end of the filter unit, the first end of the trigger switch is connected with the first end of the control module, and the second end of the trigger switch is connected with the first end of the tripper. The second end of the tripper is connected with the control end of the power supply to be protected.