CN210577751U - Relay type earth fault protection device - Google Patents
Relay type earth fault protection device Download PDFInfo
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- CN210577751U CN210577751U CN201921637239.4U CN201921637239U CN210577751U CN 210577751 U CN210577751 U CN 210577751U CN 201921637239 U CN201921637239 U CN 201921637239U CN 210577751 U CN210577751 U CN 210577751U
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Abstract
The utility model discloses a relay formula ground fault protection device, it includes switch module, relay module, electric leakage detection module, self-checking module and drive module. The switch module is coupled between the input end and the output end of the trunk line and controls the electric connection between the input end and the output end; the relay module is coupled to the input end and the switch module and controls the switch action of the switch module; the leakage detection module is coupled to the trunk line and detects whether a leakage fault signal exists at the output end of the trunk line; the self-checking module is coupled to the trunk line and the leakage detection module and periodically generates a self-checking pulse signal simulating a leakage current signal to detect whether the leakage detection module has a fault; the driving module is coupled to the leakage detection module, the self-test module and the relay module, and drives the relay module based on the received leakage fault signal and/or the self-test fault signal related to the leakage detection module. The utility model has the advantages of high safety, simple structure, low cost, high detection sensitivity and the like.
Description
Technical Field
The utility model relates to an electric field especially relates to a relay formula ground fault protection device.
Background
With the increasing popularization of household appliances, people pay more and more attention to the use safety of the household appliances, and the use of the ground fault protection device is more and more extensive, but the currently used ground fault protection device still has certain defects. For example, when a detection circuit component in the ground fault protection device is damaged and loses a protection function, a coil of a relay therein is still in an energized state, so that an input end and a load are still in an electric connection state, and a user cannot judge that the fault protection function of the ground fault protection device is failed, so that potential safety hazards exist in the process of continuously using the load. For another example, the conventional ground fault protection device is implemented by using a plurality of relay coils, so that the conventional ground fault protection device has the disadvantages of large product volume, difficult manufacturing process, high cost and the like.
Therefore, a ground fault protection device which is convenient to install and obvious in economic benefit is needed.
SUMMERY OF THE UTILITY MODEL
To the above problem, the utility model provides a relay formula ground fault protection device, and then promote the product security.
The utility model provides a relay formula ground fault protection device, it includes: the device comprises a switch module, a leakage detection module, a self-checking module, a relay module and a driving module. The switch module is coupled between the input end and the output end of the trunk line and used for controlling the power connection between the input end and the output end; the relay module is coupled to the trunk line and the switch module and used for controlling the switching action of the switch module; the leakage detection module is coupled to the trunk line and used for detecting whether a leakage fault signal exists at the output end of the trunk line; the self-checking module is coupled to the trunk line and the electric leakage detection module and used for periodically generating a self-checking pulse signal simulating an electric leakage fault signal to detect whether the electric leakage detection module has a fault or not; the driving module is coupled to the leakage detection module, the self-test module and the relay module for driving the relay module based on the received leakage fault signal and/or the self-test fault signal related to the leakage detection module. The relay module includes at least: the device comprises a relay, an auxiliary reset component and an auxiliary switch; the relay is used for controlling the switching action of the switch module; the first end of the auxiliary reset component is coupled with the relay, the second end is coupled with the trunk line, and the third end is coupled with the ground, so as to control the switching state of the relay and the switching state of the relay; an auxiliary switch is coupled to the relay for maintaining the relay in normal operation.
In one embodiment, the auxiliary reset component is driven to be conducted while the relay module is powered on, so that the relay controls the switch module and the auxiliary switch to be in a closed state; under the condition that the relay module works normally, the relay controls the switch module to keep a closed state through the auxiliary switch.
In one embodiment, the drive module comprises:
a first driving control unit, a first end of which is coupled to the relay module, a second end of which is coupled to the leakage detection module and/or the self-test module, and a third end of which is coupled to ground, for controlling the relay to open based on the leakage fault signal and/or the self-test fault signal, so as to make the switch module in an open state; and
and the second drive control unit is used for controlling the auxiliary reset component to be disconnected based on the electric leakage fault signal and/or the self-checking fault signal under the condition that the first drive control component does not work so as to enable the switch module to be in a disconnected state.
In one embodiment, the second drive control unit further comprises: a driving control part, a sound generating device or a light emitting device, wherein a first end of the driving control part is coupled to the relay module via the sound generating device or the light emitting device, a second end of the driving control part is coupled to the leakage current detection module and the self-test module, and a third end of the driving control part is coupled to the ground;
in a case where the first drive control part does not operate, the drive control part controls the relay to be turned off based on the electrical leakage fault signal and/or the self-test fault signal to put the switching module in an off state while operating the sound emitting device or the light emitting device.
In one embodiment, the relay-type ground fault protection device further comprises: a fuse module coupled between the input terminal and the relay module for increasing a current through the fuse module and controlling the relay module to stop operating by turning off the fuse module while the first and/or second driving control units control the relay to turn off based on the leakage fault signal and/or the self-test fault signal.
In one embodiment, the second terminal of the auxiliary reset component is further coupled to a differential capacitor, and the differential capacitor is used for driving the relay to operate while the relay module is powered on.
In one embodiment, the relay module further comprises: and the normally open switch component is coupled to the differential capacitor at one end and coupled to the ground at the other end and is used for being triggered to be closed after the switch module is opened.
In one embodiment, the fuse module is a fuse or any other fusible device.
In one embodiment, the auxiliary reset component, the first drive control unit, and the drive control component are one or more of a field effect transistor, a thyristor, a triode, or other switching element.
In one embodiment, the second drive control unit further comprises: the drive control part, the sound production device and the light emitting device are connected in series.
Compared with the prior art, in order to increase ground fault protection device's safety protection performance, the utility model discloses increased the relay module in ground fault protection device for the disclosed relay formula ground fault protection device can in time make the coil outage of relay when its detecting element damages the loss protect function, thereby the electric power between disconnection input and the load is connected, and then realizes the safety protection to the user's person, property.
Drawings
Embodiments are shown and described with reference to the drawings. These drawings are provided to illustrate the basic principles and thus only show the aspects necessary for understanding the basic principles. The figures are not to scale. In the drawings, like reference numerals designate similar features.
Fig. 1 shows a schematic circuit diagram of a ground fault protection device according to the present disclosure.
Detailed Description
In the following detailed description of the preferred embodiments, reference is made to the accompanying drawings which form a part hereof. The accompanying drawings illustrate, by way of example, specific embodiments in which the invention may be practiced. The illustrated embodiments are not intended to be exhaustive of all embodiments according to the invention. It is to be understood that other embodiments may be utilized and structural or logical changes may be made without departing from the scope of the present invention. The following detailed description is, therefore, not to be taken in a limiting sense, and the scope of the present invention is defined by the appended claims.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. For the connection between the units in the drawings, for convenience of description only, it means that at least the units at both ends of the connection are in communication with each other, and is not intended to limit the inability of communication between the units that are not connected.
Embodiments of the present disclosure are primarily concerned with the following technical issues: the traditional ground fault protection device adopts a plurality of groups of coils to realize the effect of ground fault protection, so that the traditional ground fault protection device has the defects of large product volume, difficult manufacturing process, high cost and the like; in addition, if the detection circuit components in the conventional ground fault protection device are damaged or lose the protection function, and the coil is still in the energized state, the user cannot judge that the ground fault protection device has failed.
In order to solve the above problems, disclosed herein is a relay type ground fault protection device including a switch module, a relay module, a leakage detecting module, a self-checking module, and a driving module. Wherein the relay module is coupled to the input terminal, the switching module, and the leakage detection module and the self-checking module via the driving module, and is configured to control a switching action of the switching module based on the received leakage fault signal and/or a self-checking fault signal related to the leakage detection module.
As shown in fig. 1, the relay type ground fault protection device disclosed in the present embodiment includes: switch module SW, electric leakage detection module 1, self-checking module 2, relay module 4, drive module 3 and fusing module 5. The switch module SW is coupled between an input terminal LINE and an output terminal LOAD of the trunk LINE, and is used for controlling power connection between the input terminal LINE and the output terminal LOAD; the relay module 4 is coupled to the trunk line and the switch module SW, and is used for controlling the switching action of the switch module SW; the leakage detection module 1 is coupled to the trunk line and is used for detecting whether a leakage fault signal exists at an output terminal LOAD of the trunk line; the self-checking module 2 is coupled to the trunk line and leakage detection module 1 and is used for periodically generating a self-checking pulse signal simulating a leakage current signal to detect whether the leakage detection module has a fault; the driving module 3 is coupled to the leakage detecting module 1, the self-checking module 2 and the relay module 4, and is used for driving the relay module based on the received leakage fault signal and/or the self-checking fault signal related to the leakage detecting module; the fuse module 5 is coupled between the input terminal LINE and the RELAY module 4, and is configured to increase a current passing through the fuse module 5 while the driving module 3 controls the RELAY to be turned off based on the electrical leakage fault signal and/or the self-test fault signal, and to control the RELAY of the present embodiment to be the ground fault protection device to stop operating by turning off the fuse module 5.
As shown in fig. 1, the relay module 4 includes: a current limiting component, a RELAY RELAY, an auxiliary RESET component Q1, an auxiliary switch S1, and a normally open switch component RESET. The current limiting component is used for providing working current for the relay module 4; the first end of the RELAY RELAY is coupled to the current limiting component and used for controlling the switching action of the switch module SW; the first end of the auxiliary reset component Q1 is coupled with the second end of the RELAY, the second end is coupled with the trunk line, and the third end is coupled with the ground, and is used for controlling the switching state of the RELAY; the auxiliary switch S1 is coupled to the RELAY for keeping the RELAY normally operating.
Specifically, as shown in fig. 1, the current limiting module at least includes: a diode D1, a resistor R4 and a diode D2 connected in series with the diode D1, resistors R6 and R8 and a differential capacitor C8 connected in series with the diode D2, and a resistor R22 connected in series with the resistor R4. The differential capacitor C8 is coupled to the second terminal of the auxiliary reset component Q1, and is used for driving the RELAY to operate while the RELAY module 4 is powered on.
In this embodiment, the normally open switch member RESET in the relay module 4 has one end coupled to the differential capacitor C8 and the other end coupled to ground for being triggered to close after the switch module SW is opened.
At the same time when the RELAY module 4 is powered on, the auxiliary reset part Q1 is turned on to put the RELAY control switch module SW and the auxiliary switch S1 in a closed state.
In the case of normal operation of the RELAY module 4, the auxiliary reset component Q1 is opened, enabling the RELAY to maintain the switch module SW in the closed state via the auxiliary switch S1.
As shown in fig. 1, the drive module 3 includes: a first drive control unit Q3 and a second drive control unit. The first driving control unit Q3 has a first terminal coupled to the RELAY module 4, a second terminal coupled to the leakage detecting module 1 and the self-checking module 2, and a third terminal coupled to ground, and is configured to control the RELAY to open based on the leakage fault signal and/or the self-checking fault signal, so as to enable the switch module SW to be in an open state. The second driving control unit has one end coupled to the relay module 4 and the other end coupled to the leakage current detecting module 1 and the self-checking module 2, and is configured to control the auxiliary reset part Q1 to be turned off based on the leakage current fault signal and/or the self-checking fault signal in case that the first driving control unit Q3 does not operate, so as to enable the switching module SW to be in an off state.
The second drive control unit further includes: a driving control component Q5, a sound generating device (not shown) or a light emitting device LED, a first end of the driving control component Q5 is coupled to the relay module 4 via the sound generating device or the light emitting device LED, a second end of the driving control component Q5 is coupled to the leakage current detecting module 1 and the self-checking module 2, and a third end of the driving control component Q5 is coupled to ground.
In the case where the first driving control unit Q3 does not operate, the driving control part Q5 controls the RELAY to be turned off based on the leakage fault signal and/or the self-test fault signal, so that the switching module SW is in an off state, and the sound emitting device or the light emitting device LED is operated at the same time, to alert a user that the RELAY type ground fault protection device has failed.
As shown in fig. 1, the leakage detecting module 1 includes a leakage detecting loop CT1 passing through the phase line L and the neutral line N, a neutral line detecting loop CT2, and a leakage detecting unit (which includes a leakage detecting chip U1 and its associated coupled electronic components (e.g., a capacitor C2, etc.)) coupled to the leakage detecting loop CT 1. When the current imbalance exists between the phase line L and the neutral line N passing through the leakage detection loop CT1, that is, when a leakage current signal exists, a corresponding voltage signal is generated on the leakage detection loop CT1, and the leakage detection chip U1 controls the first driving control unit Q3 and/or the second driving control unit to be turned on by detecting that the leakage current signal on the leakage detection loop CT1 exceeds a predetermined value, so that the RELAY is turned off, and the switch module SW is turned off.
In the present embodiment, the self-checking module 2 is used to perform periodic function check on the electrical leakage detecting module 1. The self-checking module 1 comprises a power circuit, a period timing circuit and a self-checking pulse signal circuit for simulating a leakage current signal. Referring to fig. 1, the power circuit includes a resistor R10, a voltage regulator ZD 1; the cycle timing circuit comprises a resistor R12 and a timing element (such as a capacitor C11) connected in series for generating intervals of self-test pulse signals; the self-test pulse signal circuit comprises a transistor (silicon controlled transistor Q2), a comparator U2, a diode D7, a capacitor C14, a resistor R18, and electronic elements such as resistors R7 and R16 which are respectively coupled to the transistor Q2. After the ground fault protection device is operated, self-test module 2 periodically applies an analog leakage current signal to leakage current detection loop CT1 that reaches a predetermined constant value.
The working principle of the embodiment is as follows:
first, when the RELAY module 4 is coupled to the trunk line, a current passes through the fuse module 5, the diode D1, the diode D2, the resistor R6, and the resistor R8, and charges the differential capacitor C8 to turn on the auxiliary reset component Q1, so that the phase line L, the RELAY, the auxiliary reset component Q1, and the neutral line N form a current loop, and the RELAY drives the switch module SW and the auxiliary switch S1 to be closed. The auxiliary reset device Q1 is then opened, causing the RELAY release to remain active based on the closed auxiliary switch S1.
Meanwhile, the leakage detection module 1 obtains the operating power through the fuse module 5, the diode D1, the diode D2, and the resistor R6, and the diode D4 of the self-test module 2 is turned on to provide the operating power to the self-test module 2.
When the leakage current signal (i.e., the ground fault signal) is detected by the leakage current detection ring CT1, a corresponding voltage signal is generated on the leakage current detection ring CT1, and the leakage current detection chip U1 triggers the first driving control unit Q3 in the driving module 3 to turn on through the diode D5 and the resistor R14 by detecting that the leakage current signal on the leakage current detection ring CT1 exceeds a preset value, so that the potential of the point a in fig. 1 is pulled down, the RELAY is powered off, and the switch module SW and the auxiliary switch S1 are controlled to be turned off at the same time, thereby protecting personal or property safety.
When the function of the electrical leakage detection module 1 is lost (for example, the electrical leakage detection ring CT1 is short-circuited or the electrical leakage detection chip U1 is damaged), so that the self-checking signal periodically sent by the transistor Q2 in the self-checking module 2 cannot be fed back to the self-checking module 2, the resistor R18 charges the capacitor C14, so that the diode D7 is turned on (that is, a self-checking fault signal is generated), and further triggers the first driving control unit Q3 to be turned on, so that the potential at the point a in fig. 1 is pulled down, the RELAY is powered off, and the switch module SW and the auxiliary switch S1 are controlled to be turned off at the same time, thereby protecting personal or property safety.
In addition, in the case that the first driving control unit Q3 in the driving module 3 is disconnected (e.g., damaged), when the driving module 3 receives a leakage fault signal and/or a self-test fault signal from the self-test module 2, the driving control unit Q5 in the second driving control unit is turned on, so that the phase line L, the fuse module 5, the diode D1, the resistors R4 and R15, the light emitting device LED, the driving control unit Q5, and the neutral line N form a current loop, and the RELAY is powered off, and the switching module SW is controlled to be turned off, thereby protecting personal or property safety; meanwhile, the LED works to remind a user that the ground fault protection device has a fault.
Alternatively, the light emitting device LED may be replaced with a sound producing device to alert the user that the ground fault protection device is malfunctioning.
Optionally, the second driving control part may include a sounding device, a light emitting device LED and a driving control part Q5 at the same time, so as to remind the user of the fault of the ground fault protection device by using an audible effect and a visual effect at the same time.
In this embodiment, the disclosed components of the auxiliary reset component Q1, the first driving control unit Q3, the driving control component Q5, and the like may be semiconductor elements such as MOS transistors, thyristors, and triodes.
The relay type ground fault protection device disclosed herein can control the relay module to act to disconnect the switch module while detecting the ground fault and/or the fault of the leakage detecting module. That is, the utility model discloses can in time detect the potential safety hazard that exists in the electrical apparatus use to take corresponding measure to get rid of above-mentioned potential safety hazard, can remind user fault protection device to have the hidden danger simultaneously, finally improve the security performance of power consumption product.
Thus, while the present invention has been described with reference to specific examples, which are intended to be illustrative only and not to be limiting of the invention, it will be apparent to those of ordinary skill in the art that changes, additions or deletions may be made to the disclosed embodiments without departing from the spirit and scope of the invention.
Claims (10)
1. A relay-type ground fault protection device, comprising:
a switch module coupled between an input and an output of a trunk line for controlling a power connection between the input and the output;
a relay module coupled to the trunk line and the switch module for controlling a switching action of the switch module, the relay module including at least:
a relay for controlling the switching action of the switch module,
an auxiliary reset device having a first terminal coupled to the relay, a second terminal coupled to the trunk line, and a third terminal coupled to ground, for controlling a pull-in state of the relay, an
An auxiliary switch coupled to the relay for maintaining the relay in normal operation; a leakage detection module, coupled to the trunk line, for detecting whether a leakage fault signal exists at an output terminal of the trunk line;
a self-checking module, coupled to the trunk line and the leakage detection module, for periodically generating a self-checking pulse signal simulating a leakage current signal to detect whether the leakage detection module fails; and
a driving module coupled to the electrical leakage detection module, the self-test module and the relay module for driving the relay module based on the received electrical leakage fault signal and/or a self-test fault signal related to the electrical leakage detection module.
2. Relay-type ground fault protection device according to claim 1,
when the relay module is powered on, the auxiliary reset component is driven to be conducted, so that the relay controls the switch module and the auxiliary switch to be in a closed state;
under the condition that the relay module works normally, the relay controls the switch module to keep a closed state through the auxiliary switch.
3. The bang-bang ground fault protection device of claim 1, wherein the drive module comprises:
a first driving control unit, a first end of which is coupled to the relay module, a second end of which is coupled to the leakage detection module and/or the self-test module, and a third end of which is coupled to ground, for controlling the relay to open based on the leakage fault signal and/or the self-test fault signal, so as to make the switch module in an open state; and
and the second drive control unit is used for controlling the auxiliary reset component to be disconnected based on the electric leakage fault signal and/or the self-checking fault signal under the condition that the first drive control component does not work so as to enable the switch module to be in a disconnected state.
4. The bang-bang ground fault protection device of claim 3, wherein the second drive control unit further comprises: a driving control part, a sound generating device or a light emitting device, wherein a first end of the driving control part is coupled to the relay module via the sound generating device or the light emitting device, a second end of the driving control part is coupled to the leakage current detection module and/or the self-test module, and a third end of the driving control part is coupled to the ground;
in a case where the first drive control part does not operate, the drive control part controls the relay to be turned off based on the electrical leakage fault signal and/or the self-test fault signal to put the switching module in an off state while operating the sound emitting device or the light emitting device.
5. The bang-bang ground fault protection device of claim 3, further comprising:
a fuse module coupled between the input terminal and the relay module for increasing a current through the fuse module and controlling the relay module to stop operating by turning off the fuse module while the first and/or second driving control units control the relay to turn off based on the leakage fault signal and/or the self-test fault signal.
6. The bang-bang ground fault protection device of claim 1, wherein the second terminal of the auxiliary reset device is further coupled to a differential capacitor for driving the relay to operate while the relay module is powered on.
7. The bang-bang ground fault protection device of claim 6, wherein the relay module further comprises:
and the normally open switch component is coupled to the differential capacitor at one end and coupled to the ground at the other end and is used for being triggered to be closed after the switch module is opened.
8. The bang-bang ground fault protection device of claim 5, wherein the fuse module is a fuse or any other fusible device.
9. The bang-bang ground fault protection device of claim 4, wherein the auxiliary reset component, the first drive control unit, the drive control component are one or more of a field effect transistor, a thyristor, a triode, or other switching element.
10. The bang-bang ground fault protection device of claim 4, wherein the second drive control unit further comprises: the drive control part, the sound production device and the light emitting device are connected in series.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921637239.4U CN210577751U (en) | 2019-09-27 | 2019-09-27 | Relay type earth fault protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921637239.4U CN210577751U (en) | 2019-09-27 | 2019-09-27 | Relay type earth fault protection device |
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| Publication Number | Publication Date |
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| CN210577751U true CN210577751U (en) | 2020-05-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201921637239.4U Active CN210577751U (en) | 2019-09-27 | 2019-09-27 | Relay type earth fault protection device |
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| CN (1) | CN210577751U (en) |
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- 2019-09-27 CN CN201921637239.4U patent/CN210577751U/en active Active
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