CN112448364A

CN112448364A - Relay type leakage protection device

Info

Publication number: CN112448364A
Application number: CN201910835401.1A
Authority: CN
Inventors: 李成力; 陈龙; 聂胜云
Original assignee: Suzhou Ele Mfg Co ltd
Current assignee: Suzhou Ele Mfg Co ltd
Priority date: 2019-09-05
Filing date: 2019-09-05
Publication date: 2021-03-05

Abstract

The invention discloses a relay type leakage protection device which comprises a switch module, a relay module, a leakage detection module, a self-checking module and a driving 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 current 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 current detection module, the self-test module and the relay module, and drives the relay module based on the received leakage current signal and/or a fault signal related to the leakage current detection module. The invention has the advantages of high safety, simple structure, low cost, high detection sensitivity and the like.

Description

Relay type leakage protection device

Technical Field

The invention relates to the electrical field, in particular to a relay type leakage protection device.

Background

With the increasing popularization of household appliances, people pay more and more attention to the use safety of the appliances, at present, many household appliances are equipped with an electricity consumption protection device, such as an electric leakage protection plug, but still have the following defect that when a detection component inside the electricity consumption protection device is damaged and loses the protection function, a relay coil therein is still in an electrified state, so that an input end and a load are still in an electric connection state, and then potential safety hazards exist in the continuous use process of the load.

Therefore, there is a need for an earth leakage protection device with safety protection function, which is easy to install and has obvious economic benefit.

Disclosure of Invention

In order to solve the problems, the invention provides a relay type leakage protection device, so that the safety of a product is improved.

The invention provides a relay type leakage protection device which 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 input end and the switch module and is 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 current 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 used for periodically generating a self-checking pulse signal simulating a leakage current signal so as to detect whether the leakage detection module has a fault; the driving module is coupled to the leakage current detection module, the self-test module and the relay module and is used for driving the relay module based on the received leakage current signal and/or a fault signal related to the leakage current detection module. The relay module further includes: a current limiting component, a relay and an auxiliary reset component; the current limiting component is used for providing working current for the relay module; the relay is coupled with the current limiting component and used for controlling the switching action of the switch module; an auxiliary reset component is coupled to the relay for controlling the on-off state of the relay.

In one embodiment, the drive module comprises: and the driving control component is coupled to the auxiliary reset component at one end and coupled to the leakage current detection module and the self-detection module at the other end, and is used for controlling the auxiliary reset component to be switched off based on the leakage current signal and/or the fault signal so as to enable the switch module to be in an off state.

In one embodiment, the flow restriction member includes: a resistance-capacitance voltage reduction circuit and a rectification component; the resistance-capacitance voltage reduction circuit is used for limiting the maximum working current flowing through the relay; one end of the rectifying component is coupled to the resistance-capacitance voltage reduction circuit, and the other end of the rectifying component is coupled to the first end of the relay for providing the rectified working current for the relay.

In one embodiment, the flow restriction member includes: a voltage dropping part and a rectifying part; the voltage reduction component is used for limiting the maximum working current flowing through the relay; and one end of the rectifying component is coupled to the voltage reducing component, and the other end of the rectifying component is coupled to the first end of the relay, so as to provide the rectified working current for the relay.

In one embodiment, the rectification component is a half-wave rectification component or a full-wave rectification component.

In one embodiment, the driving module further comprises: a normally open switch component; the auxiliary reset device is connected with the drive control part in parallel and is used for being triggered to be closed after the drive control part enables the switch module to be opened so as to enable the switch module to be in a closed state by controlling the auxiliary reset part to be conducted.

In one embodiment, the relay module further comprises: and the normally-closed switch component is coupled between the current limiting component and the relay or between the input end and the current limiting component and is used for controlling the switch states of the relay module and the driving module so as to realize repeated power-on reset of the relay type leakage protection device.

The invention provides a relay type leakage protection device which comprises a switch module, a relay module, a leakage detection module, a self-checking 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 input end and the switch module and is 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 current 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 used for periodically generating a self-checking pulse signal simulating a leakage current signal so as to detect whether the leakage detection module has a fault; and the driving module is coupled to the leakage current detection module, the self-test module and the relay module and is used for driving the relay module based on the received leakage current signal and/or a fault signal related to the leakage current detection module. The relay module further includes: a current limiting part, a relay, an auxiliary reset part, a fuse and a first driving control part. The current limiting component is used for providing working current for the relay module; the relay is coupled with the current limiting component and used for controlling the switching action of the switch module; the auxiliary reset component is coupled with the relay and used for controlling the on-off state of the relay; the fuse is coupled between the input terminal and the current limiting component; the first drive control component has a first terminal coupled to the fuse, a second terminal coupled to the self-test module, and a third terminal coupled to ground for conducting to increase current through the fuse based on a fault signal received from the self-test module and driving the relay control switch module in an open state by opening the fuse.

In one embodiment, the drive module comprises: and the second drive control component is coupled to the relay module at one end and the leakage detection module at the other end, and is used for controlling the auxiliary reset component to be switched off based on the leakage current signal received from the leakage detection module so as to enable the switch module to be in an off state.

In one embodiment, the flow restriction member includes: resistance-capacitance voltage reduction circuit and rectifying component. The resistance-capacitance voltage reduction circuit is used for limiting the maximum working current flowing through the relay; and one end of the rectifying component is coupled to the resistance-capacitance voltage reduction circuit, and the other end of the rectifying component is coupled to the first end of the relay, so as to provide the rectified working current for the relay.

In one embodiment, the flow restriction member includes: a voltage dropping part and a rectifying part. The voltage reduction component is used for limiting the maximum working current flowing through the relay; and one end of the rectifying component is coupled to the voltage reducing component, and the other end of the rectifying component is coupled to the first end of the relay, so as to provide the rectified working current for the relay.

In one embodiment, the driving module further comprises: and the normally open switch component is connected with the second drive control component in parallel and is used for being triggered to be closed after the second drive control component enables the switch module to be opened, so that the switch module is in a closed state by controlling the auxiliary reset component to be conducted.

Compared with the prior art, in order to increase the safety protection performance of the leakage protection device, the relay module is added in the leakage protection device, so that the disclosed relay type leakage protection device can timely cut off the power of the coil of the relay when the detection element of the relay type leakage protection device is damaged and loses the protection function, thereby disconnecting the power connection between the input end and the load and further realizing the safety protection of the personal and property of a user.

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 first embodiment of a relay-type earth leakage protection device according to the present disclosure;

fig. 2 is a schematic circuit diagram of a second embodiment of the relay-type earth leakage protection device according to the present disclosure;

fig. 3 is a schematic circuit diagram of a third embodiment of the relay-type earth leakage protection device according to the present disclosure;

fig. 4 is a schematic circuit diagram of a fourth embodiment of the relay-type earth leakage protection device according to the present disclosure; and

fig. 5 shows a schematic circuit diagram of a fifth embodiment of the relay-type earth leakage 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, therefore, is 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: when a detection element in the existing leakage protection device is damaged and fails, a relay coil in the existing leakage protection device is still in an electrified state, and an input end and an output end are still in an electric connection state, so that potential safety hazards exist in the use process.

In order to solve the above problems, a relay type leakage protection device disclosed herein includes a switch module, a relay module, a leakage detection module, a self-checking module, and a driving module. The relay module is coupled to the input end, the switch module, the leakage detection module and the driving module, so that the switch module is disconnected when the leakage detection module and the self-detection module detect a leakage current signal and/or a fault signal.

Example 1

As shown in fig. 1, the relay type earth leakage protection device disclosed in this embodiment includes: switch module 1, relay module 3, electric leakage detection module 4, self-checking module 5 and drive module 6. In the present embodiment, the switch module 1 is coupled between an input terminal LINE and an output terminal LOAD of the trunk LINE, and is configured to control a power connection between the input terminal LINE and the output terminal LOAD; the relay module 3 is coupled to the input terminal LINE and the switch module 1, and is used for controlling the switching action of the switch module 1; the leakage detection module 4 is coupled to the trunk line and is configured to detect whether a leakage signal exists at an output LOAD of the trunk line; the self-checking module 5 is coupled to the trunk line and leakage current detecting module 4, and is configured to periodically generate a self-checking pulse signal simulating the leakage current signal to detect whether the leakage current detecting module 4 fails; the driving module 6 is coupled to the leakage current detection module 4, the self-test module 5 and the relay module 3 for driving the relay module 3 based on the received leakage current signal and/or a fault signal related to the leakage current detection module 4.

As shown in fig. 1, the RELAY module 3 includes a current limiting component, a RELAY, and an auxiliary reset component Q3. In the present embodiment, the current limiting component is coupled to the input terminal LINE for providing a stable operating current to the RELAY; the RELAY is coupled with the current limiting component and used for controlling the switching action of the switch module 1; the auxiliary reset component Q3 is coupled to the RELAY for controlling the switching state of the RELAY.

In fig. 1, the current limiting section includes a resistor-capacitor voltage step-down circuit 31 and a rectifying section including a diode D4 and a diode D5, that is, the rectifying section in the present embodiment is a half-wave rectifying section. The rc step-down circuit 31 includes a resistor R6 and a capacitor C4 connected in parallel, wherein the resistor R6 is used for discharging the capacitor C4. In the present embodiment, one end of the resistor-capacitor voltage-reducing circuit 31 is coupled to the input terminal LINE via a resistor R8 for limiting the maximum operating current flowing through the RELAY. Diodes D4 and D5 in the rectifying component are both coupled to the RC step-down circuit 31, the other end of the diode D5 is coupled to the RELAY RELAY to perform the rectifying function, and the other end of the diode D4 is coupled to the ground; the diode D4 is used for reversely charging the capacitor C4; so that the rectifying means is used to supply the rectified operating current to the RELAY.

In the present embodiment, the current limiting component may be provided at any position within the relay circuit forming the relay module 3 to achieve the supply of the operating current to the relay module 3.

In addition, in fig. 1, the drive module 6 includes at least a drive control section and a normally open switch section RESET. Specifically, the driving control unit is composed of at least two transistors (e.g., Q01 and Q1) connected in parallel, and one end of the driving control unit is coupled to the relay module, and the other end is coupled to the leakage current detection module 4 and the self-detection module 5, respectively, for controlling the auxiliary reset unit Q3 to be turned off based on the leakage current signal and/or the fault signal to make the switch module 1 in an off state. The normally open switching element RESET is connected in parallel with the drive control element for being triggered to close after the drive control element has opened the switch module 1, so as to put the switch module 1 in a closed state by controlling the auxiliary RESET element Q3 to be turned on.

As shown in fig. 1, the leakage detecting module 4 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 there is current imbalance between the phase line (L) and the neutral line (N) passing through the leakage detecting loop CT1, that is, there is a leakage current signal, a corresponding voltage signal will be generated on the leakage detecting loop CT1, and the leakage detecting chip U1 controls the driving module 6 to drive the relay module 3 to turn off the switch module 1 by detecting a corresponding voltage change generated on the leakage detecting loop CT 1.

In the present embodiment, the self-checking module 5 is used to perform periodic function check on the electrical leakage detecting module 4. The self-checking module 5 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 resistors R11 and R12, a voltage regulator ZD1, and a capacitor C12; the cycle timing circuit comprises a resistor R16 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 switching tube (silicon controlled transistor Q2), a comparator U2, a diode D6, a capacitor C5, a resistor R22, and electronic elements such as resistors R5 and R19 which are respectively coupled to an emitter, a base and a collector of a triode Q2. After the operation of the leakage detecting device, the self-test module 5 periodically applies an analog leakage current signal reaching a predetermined constant value to the leakage detecting loop CT 1.

The working principle of the embodiment is as follows:

when the RELAY module 3 is coupled to the input terminal LINE, a current triggers the auxiliary reset component Q3 to conduct and maintain through the resistor R8, the capacitor C4, the diode D5, the capacitor C15, the resistor R4 and the resistor R5 in the RELAY module 3, so that the input terminal LINE, the resistor R8, the capacitor C4, the diode D5, the RELAY and the auxiliary reset component Q3 form a current loop, the RELAY generates a magnetic field, the switch module 1 is closed, and the power connection between the input terminal LINE and the output terminal LOAD is realized.

Meanwhile, the diode D3 of the leakage detection module 4 and the diode D2 of the self-checking module 5 are turned on, and the operating power is supplied to the leakage detection module 4 and the self-checking module 5, respectively.

When the leakage detection ring CT1 detects a leakage current signal (i.e., a ground fault signal), a corresponding voltage signal is generated on the leakage detection ring CT1, and the leakage detection chip U1 triggers the transistors Q01 and Q1 in the driving module 6 to be turned on and held through the diode D8 and the resistor R14 in the driving module 6 by detecting a corresponding voltage change generated on the leakage detection ring CT1, so that the internal resistance of the transistors Q01 and Q1 is lower than the resistance of the RELAY, and the potential of the point a in fig. 1 is reduced, so that the RELAY is de-energized, thereby controlling the switch module 1 to be turned off, and protecting personal or property safety.

When the detection function of the leakage detection module 4 is lost (for example, the capacitor C2 is short-circuited or the leakage detection chip U1 is damaged), the transistor Q2 in the self-detection module 5 periodically sends a self-detection signal and cannot feed back the self-detection signal to the self-detection module 5, the resistor R22 charges the capacitor C4, so that the diode D6 is turned on, the transistors Q01 and Q1 in the driving module 6 are further triggered to be turned on and maintained, the internal resistances of the transistors Q01 and Q1 are lower than the resistance of the RELAY, the potential of the point a in fig. 1 is reduced, the RELAY is powered off, the switch module 1 is controlled to be turned off, and personal or property safety is protected.

In addition, after the switch module 1 is opened, the normally open switch component RESET in the control drive module 6 is closed, so that the transistors Q01 and Q1 are short-circuited and the on holding current thereof disappears, and the RELAY control switch module 1 is closed again, thereby realizing the normal operation of the RELAY type leakage protection device.

The relay type leakage protection device disclosed by the embodiment can detect the fault of the ground fault and/or the leakage detection module, and meanwhile, the relay module is controlled by the driving module to act to disconnect the switch module, so that the potential safety hazard existing in the use process of an electric appliance is finally avoided, and the safety performance of the electric product is improved.

Example 2

Fig. 2 discloses another embodiment of the relay type earth leakage protection device, in this embodiment, the relay type earth leakage protection device comprises: switch module 1, relay module 3, electric leakage detection module 4, self-checking module 5 and drive module 6. The structures and functions of the switch module 1, the leakage detecting module 4, the self-checking module 5, and the driving module 6 are the same as those of the corresponding modules in embodiment 1, and are not described herein again.

Further, as shown in fig. 2, the rectifying component BD in the RELAY module 3 is a full-wave rectifying component, and has a first end coupled to the rc voltage-reducing circuit 31, a second end coupled to the RELAY, a third end coupled to the neutral line (N), and a fourth end coupled to the ground. Compared to embodiment 1, the rectifying part BD disclosed in this embodiment can supply double the current to the RELAY.

The working principle of the relay type earth leakage protection device disclosed in embodiment 2 is similar to that of embodiment 1, and is not described herein again.

The relay type leakage protection device disclosed by the embodiment can be suitable for normal operation of a relay by utilizing a full-wave rectification component when the relay needs a large current or when the working current provided by the input end LINE cannot meet the requirement of the relay. The relay type leakage protection device disclosed by the embodiment can timely detect potential safety hazards existing in the use process of an electric appliance, and take corresponding measures to remove the potential safety hazards, so that the safety performance of an electric product is finally improved.

Example 3

Fig. 3 shows another embodiment of the earth leakage protection device of the relay type, in which the earth leakage protection device of the relay type comprises: switch module 1, relay module 3, electric leakage detection module 4, self-checking module 5 and drive module 6. The structures and functions of the switch module 1, the leakage detecting module 4, the self-checking module 5, and the driving module 6 are the same as those of the corresponding modules in embodiment 1, and are not described herein again.

Further, in the present embodiment, the current limiting part of the relay module 3 includes: a voltage dropping section 32 and a rectifying section. The voltage dropping unit 32 is a resistor R8, one end of which is coupled to the input end for limiting the maximum operating current flowing through the RELAY. The rectifying part comprises a diode D5, that is, the rectifying part in the present embodiment is a half-wave rectifying part, a diode D5 in the rectifying part is coupled to the voltage-dropping part 32, and the other end of the diode D5 is coupled to the RELAY; so that the rectifying means is used to supply the rectified operating current to the RELAY.

The working principle of the relay type earth leakage protection device disclosed in embodiment 3 is similar to that of embodiment 1, and is not described herein again.

In this embodiment, the voltage-reducing component 32 is used instead of the rc voltage-reducing circuit 31 in

embodiments

1 and 2. The voltage-reducing member 32 disclosed in embodiment 3 is suitable for use in cases where the operating current of the RELAY is small, the installation space of the RELAY type earth leakage protection device is large, and the manufacturing budget of the RELAY type earth leakage protection device is low, as compared with

embodiments

1 and 2.

Example 4

Fig. 4 shows another embodiment of the earth leakage protection device of the relay type, in which the earth leakage protection device of the relay type comprises: switch module 1, relay module 3, electric leakage detection module 4, self-checking module 5 and drive module 6. The structures and functions of the switch module 1, the leakage detecting module 4, the self-checking module 5, and the driving module 6 are the same as those of the corresponding modules in embodiment 1, and are not described herein again.

In the present embodiment, the relay module 3 includes: the circuit comprises a resistance-capacitance voltage reduction circuit 31, a rectifying component, a normally closed switch component RESET1, a RELAY RELAY and an auxiliary RESET component Q3. In this embodiment, the normally closed switch element RESET1 is coupled between the rectifying element and the RELAY, and in actual use, the normally closed switch element RESET1 may also be coupled between the input terminal and the resistor-capacitor voltage-dropping circuit 31; the normally closed switch member RESET1 is used to control the switching state of the relay module 3.

The operation principle of the relay type earth leakage protection device disclosed in embodiment 4 is similar to that of embodiment 1, except that: when the normally closed switch component RESET1 is in a closed state and the RELAY module 3 is connected to power, current passes through a resistor R8, a capacitor C4, a diode D5, a capacitor C15, a resistor R4 and a resistor R5 in the RELAY module 3 to trigger the auxiliary RESET component Q3 to be conducted and maintained, so that the input terminal LINE, the resistor R8, the capacitor C4, the diode D5, the RELAY and the auxiliary RESET component Q3 form a current loop, the RELAY generates a magnetic field to attract the switch module 1 to be closed, and the power connection between the input terminal LINE and the output terminal LOAD is realized.

When a fault is detected, the electric leakage detection module 4 and/or the self-detection module 5 controls the switch module 1 to disconnect the power connection through the driving module 6 and the relay module 3, and the normally closed switch component RESET1 is disconnected, so that the relay real is de-energized, i.e. the maintaining current of the transistors Q1 and Q01 is disconnected, and the purpose of repeated power-on RESET is achieved.

The normally closed switch element RESET1 disclosed in this embodiment can be selectively provided in embodiments 1-3 to provide another form of RESET operation.

Example 5

Fig. 5 shows another embodiment of the earth leakage protection device of the relay type, in which the earth leakage protection device of the relay type comprises: switch module 1, relay module 3, electric leakage detection module 4, self-checking module 5 and drive module 6. The structures and functions of the switch module 1, the leakage detection module 4, and the self-detection module 5 are the same as those of the corresponding modules in embodiment 1, and are not described herein again.

Further, as shown in fig. 5, the disclosed relay module 3 includes: the fuse P1, the current limiting component, the RELAY, the auxiliary reset component Q3, and the first drive control component Q4, wherein the structures and functions of the current limiting component, the RELAY, and the auxiliary reset component Q3 are similar to those of the corresponding components in embodiment 1, and are not described again here. In the present embodiment, fuse P1 is coupled between the input and the current limiting component. The first driving control component Q4 has a first terminal coupled to the fuse P1, a second terminal coupled to the self-test module 5, and a third terminal coupled to ground, for increasing a current through the fuse P1 based on a fault signal received from the self-test module 5, and driving the RELAY control switch module 1 in an open state by opening the fuse P1.

In the present embodiment, the driving module 6 includes at least a second driving control part (including at least transistors Q1 and Q01 connected in parallel), a normally-on switching part RESET. Wherein, one end of the second driving control component (including at least the transistors Q1 and Q01 connected in parallel) is coupled to the relay module 3, and the other end is coupled to the leakage detection module 4, for controlling the auxiliary reset component Q3 to be turned off based on the leakage current signal received from the leakage detection module 4 to make the switch module 1 in the off state. The normally open switching part RESET is connected in parallel with the second drive control part for being triggered to close after the second drive control part opens the switch module 1, so as to put the switch module 1 in a closed state by controlling the auxiliary RESET part Q3 to be turned on.

The operation principle of the relay type earth leakage protection device disclosed in embodiment 5 is similar to that of embodiment 1, except that:

when the detection function of the leakage detection module 4 is lost (for example, the capacitor C2 is short-circuited or the leakage detection chip U1 is damaged), the self-detection signal periodically sent by the transistor Q2 in the self-detection module 5 cannot be fed back to the self-detection module 5, and then the resistor R22 charges the capacitor C14, the diode D6 is turned on, the transistor Q4 is triggered to be turned on and held, so that the current at the point B in fig. 5 is increased, the fuse P1 is turned off, and the RELAY is powered off and the switch module 1 is turned off to realize fault detection protection.

In the present embodiment, the full-wave rectification component BD disclosed in fig. 2 and/or the voltage reduction component 32 shown in fig. 3 may be used instead of the half-wave rectification component and/or the resistor-capacitor voltage reduction circuit 31 disclosed in the present embodiment.

The transistors (e.g., Q3, Q01, Q1, Q2, Q4, etc.) disclosed in embodiments 1 to 5 may be one or more of MOS transistors, thyristors, triodes, and the like.

The relay type leakage protection device disclosed in embodiments 1 to 5 can detect a leakage fault between an input terminal and an output terminal and an internal fault of the leakage protection device, and can cut off power connection between the input terminal and the output terminal by controlling on/off of a relay in any fault when any fault is detected, thereby ensuring power safety in a process of using electrical equipment by a user.

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

1. A relay-type earth leakage 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 input and the switch module for controlling a switching action of the switch module, the relay module further comprising:

a current limiting component for providing an operating current to the relay module,

a relay coupled to the current limiting member for controlling a switching action of the switching module, an

An auxiliary reset component coupled with the relay and used for controlling the switch state of the relay; a leakage detection module, coupled to the trunk line, for detecting whether a leakage signal exists at an output end of the trunk line;

a self-test module, coupled to the trunk line and the leakage current detection module, for periodically generating a self-test pulse signal simulating the leakage current signal to detect whether the leakage current detection module fails; and

a driving module coupled to the leakage current detection module, the self-test module and the relay module for driving the relay module based on the received leakage current signal and/or a fault signal related to the leakage current detection module.

2. A bang-bang earth leakage protection device as claimed in claim 1, wherein said drive module comprises:

and the driving control component is coupled to the auxiliary reset component at one end and coupled to the leakage current detection module and the self-detection module at the other end, and is used for controlling the auxiliary reset component to be switched off based on the leakage current signal and/or the fault signal so as to enable the switch module to be in an off state.

3. A residual current device according to claim 1, characterized in that said current limiting means comprises:

the resistance-capacitance voltage reduction circuit is used for limiting the maximum working current flowing through the relay; and

and the rectifying component is coupled to the resistance-capacitance voltage reduction circuit at one end and coupled to the first end of the relay at the other end and used for providing the rectified working current for the relay.

4. A residual current device according to claim 1, characterized in that said current limiting means comprises:

a voltage-reducing component for limiting a maximum operating current flowing through the relay; and

and the other end of the rectifying component is coupled to the first end of the relay and is used for providing the rectified working current for the relay.

5. Relay-type earth leakage protection device according to claim 3 or 4, characterized in that the rectifying member is a half-wave rectifying member or a full-wave rectifying member.

6. The bang-bang earth leakage protection device of claim 2, wherein the driving module further comprises:

and the normally open switch component is connected with the driving control component in parallel and is used for being triggered to be closed after the driving control component enables the switch module to be opened, so that the switch module is in a closed state by controlling the auxiliary reset component to be conducted.

7. The bang-bang earth leakage protection device of claim 5, wherein the relay module further comprises:

and the normally-closed switch component is coupled between the current limiting component and the relay or between the input end and the current limiting component and is used for controlling the switch states of the relay module and the driving module so as to realize repeated power-on reset of the relay type leakage protection device.

8. A relay-type earth leakage protection device, comprising:

a relay module coupled to the input and the switch module for controlling the switching action of the switch module;

a leakage detection module, coupled to the trunk line, for detecting whether a leakage signal exists at an output end of the trunk line;

a driving module coupled to the leakage current detection module, the self-test module and the relay module for driving the relay module based on the received leakage current signal and/or a fault signal related to the leakage current detection module;

the relay module further includes:

a relay coupled to the current limiting component for controlling the switching action of the switching module,

an auxiliary reset component coupled with the relay for controlling the switch state of the relay,

a fuse coupled between the input and the current limiting component, an

A first driving control part having a first terminal coupled to the fuse, a second terminal coupled to the self-test module, and a third terminal coupled to ground, for turning on to increase a current through the fuse based on a fault signal received from the self-test module, and controlling the switching module to be in an off state by driving the relay by opening the fuse.

9. A bang-bang earth leakage protection device as claimed in claim 8, wherein said drive module comprises:

the second driving control component is used for controlling the auxiliary reset component to be switched off based on a leakage current signal received from the leakage current detection module so as to enable the switch module to be in an off state.

10. A residual current device according to claim 8, characterized in that said current limiting means comprises:

11. A residual current device according to claim 8, characterized in that said current limiting means comprises:

12. A residual current device according to claim 10 or 11, characterized in that said rectifying member is a half-wave rectifying member or a full-wave rectifying member.

13. The bang-bang earth leakage protection device of claim 9, wherein the driving module further comprises:

and the normally open switch component is connected with the second drive control component in parallel and is used for being triggered to be closed after the second drive control component enables the switch module to be opened, so that the switch module is in a closed state by controlling the auxiliary reset component to be conducted.

14. The bang-bang earth leakage protection device of claim 12, wherein the relay module further comprises: