CN112653090A

CN112653090A - Leakage protection device, electric connection equipment and electrical appliance

Info

Publication number: CN112653090A
Application number: CN201910957936.6A
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: 2019-10-10
Filing date: 2019-10-10
Publication date: 2021-04-13

Abstract

The application discloses earth leakage protection device, electrical connection equipment and electrical apparatus. The earth leakage protection device includes: the leakage detection module is used for detecting a leakage current signal on the trunk line and further outputting a leakage fault signal; the self-checking module is used for periodically generating a simulated leakage current signal, and outputting a self-checking fault signal when the leakage current detection module fails; trip module, it includes: a switch coupled between the input and the output; a first coil for driving a switch to control a power connection between an input and an output; the driving module is used for driving the tripping module to disconnect the power connection under the influence of the electric leakage fault signal and/or the self-checking fault signal; and the tripping detection module is configured to generate a coil fault signal when detecting that the first coil generates an open circuit so as to enable the switch to disconnect the power connection.

Description

Leakage protection device, electric connection equipment and electrical appliance

Technical Field

The present application relates to the electrical field, and in particular, to an earth leakage protection device with a self-checking function, an electrical connection device, and an electrical appliance.

Background

Along with the improvement of people's power consumption safety consciousness, earth leakage protection device's use is more and more extensive, and in order to promote earth leakage protection device's security performance, the technical staff of trade begins to study and increases the automatic check function for earth leakage protection device, reaches when earth leakage protection device earth leakage detection protect function loses, and the output is electroless, improves the security of product. The existing leakage protection device with the self-checking function still has some defects, for example, key parts such as a trip coil and a driving part in the leakage protection device are in a working state for a long time and are easy to damage, and particularly, an enameled wire wound by the trip coil in the leakage protection device is thin and has high working temperature and is easy to damage (for example, open circuit), so that the leakage protection device loses the protection function, and therefore, input and output power connection cannot be disconnected, and electric shock safety hidden dangers exist.

Disclosure of Invention

In view of the above, the present application proposes to add trip coils to ensure that when one trip coil is damaged (e.g., broken), the earth leakage protection device can break the power connection.

One aspect of the present application discloses an earth leakage protection device, including: the leakage detection module is used for detecting a leakage current signal on the trunk line and further outputting a leakage fault signal; the self-checking module is used for periodically generating a simulated leakage current signal, and outputting a self-checking fault signal when the leakage current detection module fails; trip module, it includes: a switch (RESET) coupled between the input and the output; a first coil (SOL1) for driving the switch to control the power connection between the input and the output; the driving module is used for driving the tripping module to disconnect the power connection under the influence of the electric leakage fault signal and/or the self-checking fault signal; a trip detection module configured to generate a coil fault signal to cause the switch to disconnect the power connection when the first coil is detected to produce an open circuit.

In one embodiment, the trip detection module includes: a second coil (SOL 2); a first semiconductor element (Q3) having a first pole coupled to the trunk line, a second pole coupled to the second coil, and a control pole for receiving the coil fault signal, wherein the first semiconductor element (Q3) is responsive to the coil fault signal such that the second coil drives the switch to disconnect the power connection.

In one embodiment, the trip detection module includes: a second semiconductor element (Q2) having a control electrode coupled to the first coil, a first electrode coupled to the control electrode of the first semiconductor element (Q3) to provide the coil fault signal, and a second electrode coupled to ground potential.

In one embodiment, the first pole of the second semiconductor element (Q2) is coupled to the control pole of the first semiconductor element (Q3) via a first diode (D8) and/or a first resistor.

In one embodiment, the driving module further comprises: a third semiconductor element (Q1) having a first pole coupled to the first coil, a second pole coupled to ground, and a control pole for receiving the leakage fault signal and/or the self-test fault signal.

In one embodiment, the trip detection module further comprises: a fourth semiconductor element (Q4) having a first pole coupled to the second coil, a second pole coupled to ground potential, a control pole coupled to the first pole of the second semiconductor element (Q2) to receive the coil fault signal, wherein the first coil is coupled in series with the second coil, and the first semiconductor element (Q3) is coupled in parallel with the first coil.

In one embodiment, the gate of the third semiconductor element (Q1) receives the leakage fault signal via a first filter circuit (R10, C11) and is coupled to the gate of the fourth semiconductor element (Q4) via a second filter circuit (R20, C12), and the gate of the fourth semiconductor element (Q4) receives the self-test fault signal and the leakage fault signal via the second filter circuit, wherein the time characteristic of the first filter circuit is greater than the time characteristic of the second filter circuit. With this embodiment, when the third semiconductor element Q1 is damaged or disconnected, the fourth semiconductor element Q4 can be turned on under the control of the leakage fault signal, thereby causing the coils SOL1, SOL2 to drive the switches to be turned off; when Q1 is shorted, coil SOL1 will drive the switch off; when the third semiconductor device Q1 normally operates, the fourth semiconductor device Q4 is controlled by the self-test fault signal because the time characteristic of the first filter circuit is greater than the time characteristic of the second filter circuit.

In one embodiment, the gate of the third semiconductor element (Q1) is coupled to the gate of the fourth semiconductor element (Q4) via a third diode (D4) and/or a third resistor.

In one embodiment, any one of the first to fourth semiconductor elements is selected from the group consisting of: silicon controlled rectifier, bipolar transistor, field effect transistor, photoelectric coupling element and relay.

In one embodiment, the electrical leakage detection module comprises an electrical leakage detection coil (CT1) and a first processor (U1), wherein the first processor (U1) generates the electrical leakage fault signal based on a leakage current signal detected by the electrical leakage detection coil (CT 1); the self-test module includes a second processor (U2) to periodically generate the analog leakage current signal, and the second processor (U2) generates the self-test fault signal when the leakage detection module fails.

In one embodiment, the first processor (U1) and the second processor (U2) are packaged within a single processor.

This application another aspect provides an earth leakage protection device, includes: the leakage detection module is used for detecting a leakage current signal on the trunk line and further outputting a leakage fault signal; the self-checking module is used for periodically generating a simulated leakage current signal, and outputting a self-checking fault signal when the leakage current detection module fails; a switch module (RESET) coupled between the input and the output; a driving control module for driving the switching module to disconnect the power connection between the input terminal and the output terminal under the influence of the leakage fault signal and/or the self-checking fault signal, wherein the driving control module comprises: a first coil (SOL 1); a second coil (SOL2) coupled in series to the first coil, wherein the drive control module is configured to generate a coil fault signal when a fault is detected in one of the first and second coils, and to drive the switching module through the other coil to disconnect the power connection.

In one embodiment, the method further comprises: a first semiconductor element (Q1) coupled in series to the second coil; a second semiconductor element (Q3) coupled in series to the second coil and coupled in parallel with the first coil, wherein a control electrode of the second semiconductor element is to receive the coil fault signal; and a third semiconductor element (Q4) coupled in series to the first coil (SOL1) and in parallel with the second coil (SOL2), wherein the first and third semiconductor elements are controlled by the leakage fault signal and/or the self-test fault signal.

In one embodiment, the method further comprises: a fourth semiconductor element (Q2) having a control electrode coupled to the first coil (SOL1), a first electrode coupled to the control electrode of the second semiconductor element (Q3) to provide the coil fault signal, and a second electrode coupled to ground potential.

In one embodiment, the first pole of the fourth semiconductor element (Q2) is coupled to the control pole of the second semiconductor element (Q3) via a first diode (D8) and/or a resistor.

In one embodiment, the gate of the first semiconductor element (Q1) receives the leakage fault signal and the self-test fault signal via a first filter circuit (R10, C11), and the gate of the third semiconductor element (Q4) receives the leakage fault signal and the self-test fault signal via a second filter circuit (R20, C12), wherein the time characteristic of the first filter circuit is greater than the time characteristic of the second filter circuit.

In another aspect, the present application provides an electrical connection apparatus, including: a housing; an earth leakage protection device as claimed in any preceding claim, accommodated in the housing.

This application another aspect provides an electrical apparatus, includes: a load appliance; an electrical connection device coupled between a trunk line and the load appliance to supply power to the load appliance, wherein the electrical connection device comprises a residual current device as in any one of the preceding.

Through adopting the technical scheme of this application, can be so that when the coil breaks down among the earth leakage protection device, still can the dropout, ensure the power consumption safety.

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. In addition, lines drawn between each block in the architecture diagram indicate electrical or magnetic coupling between the two blocks, and the absence of a line from a block does not indicate a lack of coupling between the two blocks.

Fig. 1 is a schematic diagram of an earth leakage protection device according to an embodiment of the present application;

FIG. 2 is a schematic diagram of a leakage protection device according to a first embodiment of the present application;

FIG. 3 is a schematic diagram of a leakage protection device according to a second embodiment of the present application;

FIG. 4 is a schematic diagram of a leakage protection device according to a third embodiment of the present application;

FIG. 5 is a schematic diagram of an earth leakage protection device according to a fourth embodiment of the present application;

FIG. 6A is a schematic view of an electrical connection apparatus according to an embodiment of the present application;

fig. 6B is an architecture diagram of a consumer according to an embodiment of the present application.

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 present application can be practiced. The illustrated embodiments are not intended to be exhaustive of all embodiments according to the application. 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 application. The following detailed description, therefore, is not to be taken in a limiting sense, and the scope of the present application is defined by the appended claims.

The terminology used in this application is set forth. A transistor may refer to a transistor of any structure, such as a Field Effect Transistor (FET), a bipolar transistor (BJT), or a controllable silicon. When the transistor is a field effect transistor, the control electrode of the transistor refers to a grid electrode of the field effect transistor, the first electrode can be a drain electrode or a source electrode of the field effect transistor, and the corresponding second electrode can be a source electrode or a drain electrode of the field effect transistor; when the transistor is a bipolar transistor, the control electrode of the transistor refers to the base electrode of the bipolar transistor, the first electrode can be the collector electrode or the emitter electrode of the bipolar transistor, and the corresponding second electrode can be the emitter electrode or the collector electrode of the bipolar transistor; when the transistor is a thyristor, the control electrode of the transistor is the control electrode G of the thyristor, the first electrode is an anode, and the second electrode is a cathode. The analog leakage current signal is a periodic signal generated by the self-checking module, and the duration time of the analog leakage current signal is short, so that although the leakage current detecting module can detect the analog leakage current signal, the leakage current protecting device is not required to be disconnected from the power connection; the real leakage current signal is a non-periodic signal generated on the power supply line, the duration time of the real leakage current signal is long, and when the real leakage current signal is generated, the leakage protection device needs to be disconnected from the power connection.

The present application is directed to a leakage protection device with a self-checking function, which can ensure that the leakage protection device can disconnect power when one trip coil is damaged (e.g., broken) by adding the trip coil.

Fig. 1 is a schematic diagram of a leakage protection device according to an embodiment of the present application.

As shown in fig. 1, the earth leakage protection device includes an earth leakage detection module 1, a self-checking module 2, a driving module 3, and a trip module 4. The leakage detection module 1 is coupled to the coupled trunk line, and is configured to detect whether a leakage signal exists on the trunk line. When the leakage current signal is detected, a leakage fault signal is provided to the trip module 3. The self-checking module 2 is coupled to the trunk line and the leakage detection module 1, and is configured to periodically generate an analog leakage current signal to detect whether the leakage detection module 1 fails. When the leakage detection module 1 fails, the self-checking module 2 provides a self-checking fault signal to the trip module 4. The driving module 3 controls the trip module 4 based on the leakage fault signal and/or the self-test fault signal. The trip module 4 is coupled between the input and output of the trunk line and controls the power connection by a signal provided by the drive module 3. The trip detection module 5 is coupled to the trunk line and the trip module 4, and is configured to detect whether the trip module 4 is operating normally. When the trip detection module 5 detects that the first coil in the trip module 4 is out of order, it will generate a coil failure signal, which in turn causes the trip module 4 to disconnect power.

Fig. 2 is a schematic diagram of a leakage protection device according to a first embodiment of the present application.

As shown in fig. 2, the electrical leakage detection module 1 includes detection coils CT1, CT2 coupled to the trunk line, and a processor U1. When the detection coils CT1, CT2 detect the leakage current signal, the processor U1 generates a leakage fault signal. It is understood that the leakage current signal may be an actual leakage current signal, or may be an analog leakage current signal generated by the self-test module 2.

The trip module 4 includes a switch RESET for disconnecting or maintaining a power connection between the input terminal and the output terminal, and a first coil SOL1 for controlling a state of the switch RESET.

The trip detection module 5 includes: a second coil SOL2 and at least one transistor in series with the second coil SOL 2. When the first coil SOL1 is damaged (i.e., broken), the second coil SOL2 operates to break the power connection between the input terminal and the output terminal. In other words, when the first coil SOL1 is inoperable, the second coil SOL2 is still operable. Specifically, the first transistor Q3 is coupled in series with the second coil SOL2 and in parallel with the first coil SOL1, and the second coil SOL2 is coupled in series with the first coil SOL1 and to ground via the second transistor Q4. Therefore, when the first coil SOL1 is damaged, a current can flow through the second coil SOL2 by setting the states of Q3 and Q4, and the switch RESET is turned off.

A control electrode of the transistor Q2 is coupled to the first coil SOL1, a first electrode is coupled to the control electrodes of the transistors Q3, Q4, and a second electrode is coupled to ground. Specifically, a first pole of the transistor Q2 is coupled to the gate of the transistor Q3 via a diode D8 and to the gate of the transistor Q4 via a diode D7. It is understood that the first pole of the transistor Q2 may be coupled to the gate of the transistor Q3 via the diode D8 and/or resistor, and to the gate of the transistor Q4 via the diode D7 and/or resistor. When the switch K1 is closed, the gate of the transistor Q2 is coupled to the power source via the resistor R9 and the coil SOL1, so that the potential of the node a is at a low potential, and the transistors Q3 and Q4 are both in an off state.

Self-test module 2 includes processor U2 and transistor Q7 to periodically generate an analog leakage current signal. Specifically, when the power supply is powered, the capacitor C10 is charged in the self-checking module 2 through the resistor R16, and when the potential is charged to be higher than a preset value, the processor U2 outputs a high potential to turn on the transistor Q5. In another embodiment, the processor U2 may also collect the voltage on the capacitor C10 and the resistor R14, and encode the collected voltage to generate an output signal for controlling the transistor Q5. After the transistor Q5 is turned on, the detection coil CT1 detects the analog leakage current signal, so that the processor U1 outputs a leakage fault signal.

The leakage fault signal is coupled to transistor Q7 in self-test module 2 and transistor Q1 in driver module 3, respectively. The speed of the rising of the gate potential of the transistor Q1 can be made slower than that of the transistor Q7 by the sub-circuits (e.g., the resistor R10, the capacitor C11). When the transistor Q7 is turned on (the transistor Q1 is not turned on), the transistor Q7 will continue to discharge the capacitor C10, so that the processor U2 outputs a low level to turn off the transistor Q5, thereby stopping the supply of the analog leakage current signal to the leakage current fault detection unit 1. When the resistor 16 in the self-test circuit 2 starts to charge the capacitor C10 again, the next cycle of self-test is started. When the output signal of the processor U2 fails to be inverted due to a failure of an element affecting the self-test process, the processor U2 continuously outputs a high voltage (i.e., a self-test failure signal) to charge the capacitor C11 through the diode D5, thereby controlling the transistor Q1. It will be appreciated that the sub-circuits described above may include not only resistors, capacitors, but also other active or passive components.

In one embodiment, the processor U1 and the processor U2 may be packaged in a single processor, thereby simplifying circuit configuration, reducing power consumption and reducing size of the product.

The operation of the earth leakage protection device of fig. 2 is described below.

After the switch RESET is pressed down, the power supply is switched on, and the product works normally.

When the leakage detection module 1 outputs a leakage fault signal (corresponding to a real leakage current signal) through the diode D4 or the self-detection module outputs a self-detection fault signal through the D5, the transistor Q1 is conducted to form an L-K1-D1-SOL1-Q1-N current loop, the coil SOL1 generates a magnetic field to drive the switch RESET to trip, and the input and output power connection is disconnected, so that the safety is ensured.

When no real leakage current signal or self-test fault signal exists, if the coil SOL1 is in an open circuit, the control electrode of the transistor Q2 is powered off, the transistor Q2 is turned off, the potential of the node A is increased (namely, a coil fault signal is generated), the transistors Q3 and Q4 are turned on through the diodes D8 and D7 to form an L-K1-D1-Q3-SOL2-Q4-N current loop, and the coil SOL2 generates a magnetic field to enable the switch RESET to be tripped, so that the power connection between the input end and the output end is disconnected. At this time, if the switch RESET is repeatedly depressed, the earth leakage protection device will trip repeatedly, and the output terminal cannot output power.

Fig. 3 is a schematic circuit diagram of a leakage protection device according to a second embodiment of the present invention.

In the leakage protection device of fig. 3, the gate of the transistor Q4 is coupled to the gate of the transistor Q1.

The operation of the earth leakage protection device in fig. 3 is explained below.

When a real leakage current signal exists, the leakage detection module 1 outputs a leakage fault signal, and the time characteristics of the filter circuit (R10 and C11) coupled to the control electrode of the transistor Q1 and the filter circuit (R20 and C12) coupled to the control electrode of the transistor Q4 are set, so that under the influence of the leakage fault signal, the transistor Q1 is turned on before Q4, a current loop L-K1-D1-SOL1-Q1-N is formed, a coil SOL1 generates a magnetic field, a drive switch RESET is tripped, and the power connection between the input end and the output end is broken.

When the periodic self-test process cannot be completed (for example, the leakage detection function is lost), the processor U2 in the self-test module 2 continuously outputs a high potential, and outputs a self-test fault signal through the diode D5, so that the transistor Q4 is turned on to form a current loop L-K1-D1-SOL1-SOL2-Q4-N, so that the coils SOL1 and SOL2 generate a magnetic field to drive the switch RESET to trip, and the power connection between the input end and the output end is broken.

When the coil SOL1 is turned off, the gate of the transistor Q2 is turned off (in an off state), the potential of the node a rises, and the transistors Q3 and Q4 are turned on through the diodes D8 and D7, thereby forming a current loop L-K1-D1-Q3-SOL 2-Q4-N. Coil SOL2 generates a magnetic field that drives switch RESET trip, breaking the electrical connection between the input and output.

When the transistor Q1 generates a fault (such as an open circuit), if the leakage detection module 1 outputs a leakage fault signal, the C12 is charged through D4 and R20, so that the transistor Q4 is turned on, a current loop L-K1-D1-SOL1-SOL2-Q4-N is formed, and the coils SOL1 and SOL2 generate a magnetic field to drive the switch RESET to trip, so as to break the power connection between the input end and the output end.

When the transistor Q1 is short-circuited, a current loop L-K1-D1-SOL1-N is formed, the coil SOL1 generates a magnetic field, the drive switch RESET is tripped, and the power connection between the input end and the output end is disconnected.

In this embodiment, coil SOL1 and/or SOL2 can drive switch RESET to trip whether transistor Q1 is open or short. When the transistor Q1 operates normally, the transistor Q4 is controlled by the self-test fault signal in this case because the filter circuit (R10, C11) is larger than the time characteristic of the filter circuit (R20, C12).

Fig. 4 is a schematic circuit diagram of a leakage protection device according to a third embodiment of the present invention.

As shown in fig. 4, one end of the second coil SOL2 is coupled to a power supply terminal, and the transistor Q3 is connected in series with the second coil SOL 2. A transistor Q2 has a control electrode coupled to the first coil SOL1, a first electrode coupled to a power supply terminal and to transistor Q3, and a second electrode coupled to ground. It is appreciated that the transistor Q2 may be coupled to the transistor Q3 through a diode D8 and/or a resistor.

The operation of the earth leakage protection device in fig. 4 is explained below.

And pressing the RESET, switching on a power supply and enabling the product to work normally.

When the leakage detection module 1 outputs a leakage fault signal (corresponding to a real leakage current signal) through the diode D4 or the self-detection module outputs a self-detection fault signal through the diode D5, the transistor Q1 is turned on to form a current loop L-K1-D1-SOL1-Q1-N, the coil SOL1 generates a magnetic field to drive the switch RESET to trip, and the power connection between the input end and the output end is broken.

When the coil SOL1 is disconnected, the control electrode of the transistor Q2 is disconnected (cut off), the potential of the node A is increased, the transistor Q3 is turned on through the diode D8, an L-K1-D1-Q3-SOL2-N current loop is formed, the coil SOL2 generates a magnetic field, the drive switch RESET is tripped, and the power connection between the input end and the output end is disconnected.

Fig. 5 is a schematic circuit diagram of a leakage protection device according to a fourth embodiment of the present invention.

Coil SOL1 and coil SOL2 may control switch module 4 separately or together, as shown. A transistor Q3 is connected in parallel with the coil SOL1, and a transistor Q4 is connected in parallel with the coils SOL2 and Q1. Therefore, when SOL1 breaks, transistor Q3 is made conductive, and the switch RESET can also be tripped by coil SOL 2.

The operation of the earth leakage protection device of fig. 5 is described below.

When the leakage detection module 1 outputs a leakage fault signal (corresponding to a real leakage current signal) through the diode D4 or the self-detection module outputs a self-detection fault signal through the diode D5, the transistor Q1 can be turned on earlier than the transistor Q4 by setting the filter circuits (R10 and C11) and (R20 and C12), so as to form a L-K1-D1-SOL1-SOL2-Q1-N current loop, and the coils SOL1 and SOL2 generate a magnetic field to drive the switch RESET to trip and break the electrical connection between the input end and the output end.

When the coil SOL1 is turned off, the gate of the transistor Q2 is turned off, the potential at point a rises, and the diode D8 turns on the transistor Q3. If a leakage fault signal and/or a self-checking fault signal occur, a current loop L-K1-D1-Q3-SOL2-Q1-N is formed, a coil SOL2 generates a magnetic field, a switch RESET is driven to trip, and the electric connection between the input end and the output end is disconnected.

When the coil SOL2 is disconnected, if a leakage fault signal and/or a self-test fault signal occur, a high potential is continuously supplied to the control electrodes of the transistors Q1 and Q4, a current loop L-K1-D1-SOL1-Q4-N is formed because the SOL2 is disconnected, the coil SOL1 generates a magnetic field, a drive switch RESET is tripped, and the power connection between the input end and the output end is disconnected.

Similarly, when the transistor Q1 is open, if a leakage fault signal and/or a self-test fault signal occur, a current loop L-K1-D1-SOL1-Q4-N is formed, and the coil SOL1 generates a magnetic field to drive the switch RESET to trip, so that the power connection between the input and the output is disconnected.

When the transistor Q1 is short-circuited, a current loop L-K1-D1-SOL1-SOL2-N is formed, and coils SOL1 and SOL2 generate magnetic fields to trip a drive switch RESET and disconnect the power connection between the input and the output.

Although the above description has been given by taking a transistor as an example, it is understood that the transistor may be other types of semiconductor devices, such as a thyristor, a triode, a MOS transistor, a photo-coupler, a relay, and other controllable switching devices.

Fig. 6A and 6B are architecture diagrams of an electrical connection device and a consumer, respectively, according to an embodiment of the present application.

As shown, the electrical connection device 61 includes: a case 611 and an earth leakage protection device (not shown) accommodated therein, wherein the case is formed with a through hole to pass a first button corresponding to the switch RESET and a second button corresponding to the TEST switch TEST. The consumer 62 includes a load appliance 621 and an electrical connection device 61 coupled between the trunk line and the load appliance to provide power to the load appliance.

Thus, while the present application has been described with reference to specific examples, which are intended to be illustrative only and not to be limiting of the application, 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 application.

Claims

1. An earth leakage protection device, comprising:

the leakage detection module is used for detecting a leakage current signal on the trunk line and further outputting a leakage fault signal;

the self-checking module is used for periodically generating a simulated leakage current signal, and outputting a self-checking fault signal when the leakage current detection module fails;

trip module, it includes:

a switch (RESET) coupled between the input and the output;

a first coil (SOL1) for driving the switch to control the power connection between the input and the output;

the driving module is used for driving the tripping module to disconnect the power connection under the influence of the electric leakage fault signal and/or the self-checking fault signal;

a trip detection module configured to generate a coil fault signal to cause the switch to disconnect the power connection when the first coil is detected to produce an open circuit.

2. The earth leakage protection device of claim 1 wherein said trip detection module comprises:

a second coil (SOL 2);

a first semiconductor element (Q3) having a first pole coupled to the trunk line, a second pole coupled to the second coil, and a control pole for receiving the coil fault signal, wherein the first semiconductor element (Q3) is responsive to the coil fault signal such that the second coil drives the switch to disconnect the power connection.

3. The earth leakage protection device of claim 2 wherein said trip detection module comprises:

a second semiconductor element (Q2) having a control electrode coupled to the first coil, a first electrode coupled to the control electrode of the first semiconductor element (Q3) to provide the coil fault signal, and a second electrode coupled to ground potential.

4. A leakage protection device according to claim 3, characterized in that the first pole of the second semiconductor element (Q2) is coupled to the control pole of the first semiconductor element (Q3) via a first diode (D8) and/or a first resistor.

5. A residual current device as claimed in claim 3, characterized in that said driving module further comprises:

a third semiconductor element (Q1) having a first pole coupled to the first coil, a second pole coupled to ground, and a control pole for receiving the leakage fault signal and/or the self-test fault signal.

6. The residual current device as claimed in claim 5, wherein said trip detection module further comprises:

a fourth semiconductor element (Q4) having a first pole coupled to the second coil, a second pole coupled to ground potential, a control pole coupled to the first pole of the second semiconductor element (Q2) to receive the coil fault signal,

wherein the first coil is coupled in series with the second coil, and the first semiconductor element (Q3) is coupled in parallel with the first coil.

7. A residual current protection device as claimed in claim 6,

a gate of the third semiconductor element (Q1) receives the leakage fault signal via a first filter circuit (R10, C11) and is coupled to a gate of the fourth semiconductor element (Q4) via a second filter circuit (R20, C12),

the gate of the fourth semiconductor element (Q4) further receives the self-test fault signal and the leakage fault signal via the second filter circuit, wherein a temporal characteristic of the first filter circuit is greater than a temporal characteristic of the second filter circuit.

8. A residual current protection device as claimed in claim 5,

the gate of the third semiconductor element (Q1) is coupled to the gate of the fourth semiconductor element (Q4) via a third diode (D4) and/or a third resistor.

9. A residual current device as claimed in claim 6, characterized in that any one of said first to fourth semiconductor elements is selected from the group consisting of:

silicon controlled rectifier, bipolar transistor, field effect transistor, photoelectric coupling element and relay.

10. A residual current protection device as claimed in claim 1,

the electric leakage detection module comprises an electric leakage detection coil (CT1) and a first processor (U1), wherein the first processor (U1) generates the electric leakage fault signal based on a leakage current signal detected by the electric leakage detection coil (CT 1);

the self-test module includes a second processor (U2) to periodically generate the analog leakage current signal, and the second processor (U2) generates the self-test fault signal when the leakage detection module fails.

11. A residual current device as claimed in claim 10,

the first processor (U1) and the second processor (U2) are packaged in a single processor.

12. An earth leakage protection device, comprising:

a switch module (RESET) coupled between the input and the output;

a driving control module for driving the switching module to disconnect the power connection between the input terminal and the output terminal under the influence of the leakage fault signal and/or the self-checking fault signal, wherein the driving control module comprises:

a first coil (SOL 1);

a second coil (SOL2) coupled in series to the first coil,

wherein the drive control module is configured to generate a coil failure signal when detecting that one of the first and second coils is failed, so that the other coil drives the switching module to disconnect the power connection.

13. A residual current device as claimed in claim 12, characterized in that it further comprises:

a first semiconductor element (Q1) coupled in series to the second coil;

a second semiconductor element (Q3) coupled in series to the second coil and coupled in parallel with the first coil, wherein a control electrode of the second semiconductor element is to receive the coil fault signal; and

a third semiconductor element (Q4) coupled in series to the first coil (SOL1) and in parallel with the second coil (SOL2),

wherein the first semiconductor element and the third semiconductor element are controlled by the leakage fault signal and/or the self-test fault signal.

14. A residual current device as claimed in claim 13, characterized in that it further comprises:

a fourth semiconductor element (Q2) having a control electrode coupled to the first coil (SOL1), a first electrode coupled to the control electrode of the second semiconductor element (Q3) to provide the coil fault signal, and a second electrode coupled to ground potential.

15. A residual current device as claimed in claim 14,

a first pole of the fourth semiconductor element (Q2) is coupled to a control pole of the second semiconductor element (Q3) through a first diode (D8) and/or a resistor.

16. A residual current device as claimed in claim 13,

the gate of the first semiconductor element (Q1) receives the leakage fault signal and the self-test fault signal via a first filter circuit (R10, C11),

a control electrode of the third semiconductor element (Q4) receives the leakage fault signal and the self-test fault signal via a second filter circuit (R20, C12),

wherein a temporal characteristic of the first filter circuit is greater than a temporal characteristic of the second filter circuit.

17. A residual current device with self-test function as claimed in claim 12,

18. A residual current device as claimed in claim 17, characterized in that said first processor (U1) and said second processor (U2) are packaged in the same processor.

19. A residual current device as claimed in claim 14, characterized in that any one of said first to fourth semiconductor elements is selected from the group consisting of:

20. An electrical connection apparatus, comprising:

a housing;

the earth leakage protection device of any one of claims 1-19, housed in the housing.

21. An electrical consumer, comprising:

a load appliance;

an electrical connection device coupled between a trunk line and the load appliance to supply power to the load appliance, wherein the electrical connection device comprises a residual current device as claimed in any one of claims 1 to 19.