Fuse type leakage protection device

Abstract

The present invention discloses a fusible leakage protection device, which includes: a switch module, a leakage detection module, a self-test module and a relay module. The switch module is coupled between the input end and the output end of the trunk line, and is used to control the power connection between the input end and the output end; the leakage detection module is coupled to the trunk line, and is used to detect whether there is a leakage fault signal at the output end of the trunk line; the self-test module is coupled to the trunk line and the leakage detection module, and is used to periodically generate a self-test pulse signal simulating the leakage fault signal to detect whether the leakage detection module fails; the relay module is coupled to the trunk line, the switch module, the leakage detection module and the self-test module, and is used to control the switching action of the switch module based on the received leakage fault signal and / or the self-test fault signal related to the leakage detection module. The disclosed fusible leakage protection device has the advantages of high safety, simple structure, low cost, high detection sensitivity, etc.

Description

Technical Field

[0001] The invention relates to the field of circuits, and in particular to a fuse-type leakage protection device. Background Art

[0002] With the increasing popularity of electrical appliances, people pay more and more attention to the safety of electrical appliances, and the use of leakage protection devices is becoming more and more widespread. At present, many household appliances are equipped with leakage protection devices, such as leakage protection plugs, but there are still some defects. When the detection circuit components (such as integrated circuits, transistors, etc.) inside the leakage protection device are damaged and lose their protection function, the relay coil therein is still in the energized state, so that the input end and the load are still in the power connection state, and there is a safety hazard when the load continues to be used.

[0003] Therefore, there is an urgent need for a leakage protection device that is easy to install, has obvious economic benefits and high safety performance. Summary of the invention

[0004] In view of the above problems, the present invention proposes a fuse-type leakage protection device to improve product safety.

[0005] The present invention proposes a fuse-type leakage protection device, which includes: a switch module, a leakage detection module, a self-test module and a relay module. The switch module is coupled between the input end and the output end of the trunk line, and is used to control the power connection between the input end and the output end; the leakage detection module is coupled to the trunk line, and is used to detect whether there is a leakage fault signal at the output end of the trunk line; the self-test module is coupled to the trunk line and the leakage detection module, and is used to periodically generate a self-test pulse signal simulating a leakage current signal to detect whether the leakage detection module fails; the relay module is coupled to the trunk line, the switch module, the leakage detection module and the self-test module, and is used to control the switching action of the switch module based on the received leakage fault signal and / or the self-test fault signal related to the leakage detection module. The relay module further includes: a first coil, a fuse, a first auxiliary component, and a second auxiliary component; the fuse is coupled to the main line, and is used to disconnect the relay module when the current passing through the fuse is too large; the first coil is coupled to the fuse, and is used to control the state of the switch module; the first auxiliary component is coupled to the first coil, the leakage detection module and / or the self-test module, and is used to control the first coil; the second auxiliary component is connected in series between the fuse and the first auxiliary component, and is at least coupled to the self-test module; when the first auxiliary component works normally, based on the leakage fault signal and / or the self-test fault signal, the first auxiliary component is disconnected to control the first coil to drive the switch module to be in a disconnected state; or when the first auxiliary component is short-circuited, at least based on the self-test fault signal, the second auxiliary component is turned on to increase the current passing through the fuse, and the relay module is driven to disconnect by disconnecting the fuse.

[0006] In one embodiment, the fusible leakage protection device also includes a first driving component, which is at least coupled to the first auxiliary component and the leakage detection module, and is used to drive the first auxiliary component to disconnect based on at least the leakage fault signal, so as to control the first coil to put the switch module in a disconnected state.

[0007] In one embodiment, the first driving component is further coupled to the self-test module, and is used to drive the first auxiliary component to disconnect based on the self-test signal to control the first coil to put the switch module in an open state; and the second auxiliary component is further coupled to the leakage detection module.

[0008] In one embodiment, when the first driving component is open-circuited, when the second auxiliary component receives the leakage fault signal and / or the self-test fault signal, the current passing through the fuse is increased, and the relay module is disconnected by breaking the fuse.

[0009] In one implementation, when the first driving component is short-circuited, the first auxiliary component is disconnected to disconnect the current loop of the first coil and to put the switch module in an off state.

[0010] In one implementation, when the first auxiliary component is open-circuited, the current loop of the first coil is disconnected, so that the switch module is in an off state.

[0011] In one embodiment, in the event that the first auxiliary component is short-circuited, when the second auxiliary component receives the leakage fault signal and / or the self-test fault signal, the second auxiliary component is turned on, increasing the current passing through the fuse, and disconnecting the fuse to disconnect the relay module.

[0012] In one implementation, when the first driving component is turned on, the first auxiliary component is turned off; when the first driving component is turned off, the first auxiliary component is turned on.

[0013] In one embodiment, the relay module further comprises:

[0014] A second coil, coupled to the main line, for controlling the switch module to close;

[0015] A third auxiliary component is coupled to the second coil and is used to activate the second coil.

[0016] In one embodiment, the relay module further comprises:

[0017] a differential capacitor coupled between the third auxiliary component and used for controlling the third auxiliary component;

[0018] The first reset switch component has one end coupled to the differential capacitor and the other end coupled to the ground, and is used to be triggered to close after the switch module is disconnected, so as to discharge the differential capacitor and realize the normal operation of the second coil by controlling the third auxiliary component to be turned on.

[0019] In one embodiment, the self-test module at least includes: a fourth auxiliary component coupled to the first auxiliary component, for driving the first auxiliary component to disconnect based on the received self-test fault signal, so as to control the first coil to disconnect the switch module.

[0020] In one embodiment, the relay module further includes: a fifth auxiliary component, a first end of which is coupled to the first auxiliary component, a second end of which is coupled to the self-test module and a third end of which is coupled to ground, for driving the first auxiliary component to disconnect based on the received self-test fault signal to control the first coil to disconnect the switch module.

[0021] In one embodiment, the relay module further includes: a second reset switch component, one end of which is coupled to the first drive component and the other end is coupled to the ground, and is configured to be triggered to close after the switch module is disconnected, so that the first drive component is cut off, so that the switch module is in a closed state by controlling the first auxiliary component to be turned on.

[0022] Compared with the prior art, in order to increase the safety protection performance of the leakage protection device, the present invention adds a relay module to the leakage protection device, so that when the disclosed fuse-type leakage protection device's detection element is damaged and loses its protection function, the relay coil can be powered off in time, thereby disconnecting the power connection between the input end and the load, thereby achieving safety protection of the user's life and property. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The embodiments are shown and explained with reference to the accompanying drawings. These drawings are used to explain the basic principles, and only the aspects necessary for understanding the basic principles are shown. These drawings are not to scale. In the drawings, the same reference numerals represent similar features.

[0024] Figure 1 A schematic diagram of the circuit structure of one embodiment of the fuse-type leakage protection device disclosed in the present invention is shown;

[0025] Figure 2 A schematic diagram showing the circuit structure of the second embodiment of the fuse type leakage protection device disclosed in the present invention; and

[0026] Figure 3 A circuit structure schematic diagram of the third embodiment of the fuse type leakage protection device disclosed in the present invention is shown. DETAILED DESCRIPTION

[0027] In the following specific description of the preferred embodiments, reference will be made to the attached drawings which constitute a part of the present invention. The attached drawings show by way of example specific embodiments that can implement the present invention. The illustrative embodiments are not intended to be exhaustive of all embodiments according to the present invention. It will be appreciated that other embodiments may be utilized, and structural or logical modifications may also be made without departing from the scope of the present invention. Therefore, the following specific description is not restrictive, and the scope of the present invention is limited by the appended claims.

[0028] The technologies, methods and devices known to those skilled in the art may not be discussed in detail, but where appropriate, the technologies, methods and devices shall be considered as part of the specification. The connection lines between the units in the drawings are only for the convenience of explanation, which means that at least the units at both ends of the connection lines are in communication with each other, and are not intended to limit the inability of unconnected units to communicate with each other.

[0029] The embodiments of the present disclosure mainly focus on the following technical issues: when the detection element in the existing leakage protection device is damaged and fails, the relay coil therein is still energized, and the input and output ends are still in an electrical connection state, thus posing a safety hazard during use.

[0030] In order to solve the above problems, the fuse-type leakage protection device disclosed herein includes a switch module, a relay module, a leakage detection module and a self-test module. The relay module is coupled to the trunk line, the switch module, the leakage detection module and the self-test module, and is used to control the switching action of the switch module based on the received leakage fault signal and / or the self-test fault signal related to the leakage detection module.

[0031] Example 1

[0032] like Figure 1 As shown, the fuse-type leakage protection device disclosed in this embodiment includes: a switch module SW, a leakage detection module 1, a self-test module 2 and a relay module 3. The switch module SW is coupled between the input end LINE and the output end LOAD of the main line, and is used to control the power connection between the input end LINE and the output end LOAD. The leakage detection module 1 is coupled to the main line, and is used to detect whether there is a leakage fault signal at the output end LOAD of the main line. The self-test module 2 is coupled to the main line and the leakage detection module 1, and is used to periodically generate a self-test pulse signal simulating a leakage current signal to detect whether the leakage detection module 1 fails. The relay module 3 is coupled to the main line, the switch module SW, the leakage detection module 1 and the self-test module 2, and is used to control the switching action of the switch module SW based on the received leakage fault signal and / or the self-test fault signal related to the leakage detection module.

[0033] like Figure 1As shown, the relay module 3 includes: a current limiting component, a fuse P1, a first coil RELAY2, a first auxiliary component Q5, a second auxiliary component Q1, a first driving component Q4 and a second reset switch component RESET1. Among them, the fuse P1 is coupled to the main line via a current limiting component (for example, it includes resistors R2, R5, etc.), and the fuse P1 is used to disconnect the relay module 3 when the current passing through it is too large; the first coil RELAY2 is coupled to the current limiting component, which is used to control the state of the switch module SW; the first auxiliary component Q5 is coupled to the first coil RELAY2, the leakage current detection module 1 and / or the self-test module 2, which is used to control the first coil RELAY2; the second auxiliary component Q1 is connected in series between the fuse P1 and the first auxiliary component Q5 and in parallel to the first coil RELAY2, and is coupled to at least the self-test module 2; the first driving component Q4 is coupled to at least the first auxiliary component Q5 and the leakage detection module 1, which is used to drive the first auxiliary component Q5 to disconnect based on at least the leakage fault signal, so as to control the first coil RELAY2 to put the switch module SW in the disconnected state.

[0034] In this embodiment, when the first auxiliary component works normally, the first auxiliary component Q5 is disconnected based on the leakage fault signal and / or the self-test fault signal to control the first coil RELAY2 to drive the switch module SW to be in an off state.

[0035] When the first auxiliary component Q5 is short-circuited, the second auxiliary component Q1 is turned on based on at least the self-test fault signal, increasing the current through the fuse P1 and driving the relay module 3 to disconnect by disconnecting the fuse P1.

[0036] In this embodiment, one end of the second reset switch component RESET1 is coupled to the first drive component Q5 and the other end is coupled to the ground, and is used to be triggered to close after the switch module SW is disconnected, so that the first drive component Q5 is turned off, so that the switch module SW is in a closed state by controlling the first auxiliary component Q5 to be turned on.

[0037] like Figure 1As shown, the leakage detection module 1 includes a leakage detection ring CT1 passing through the phase line (L) and the neutral line (N), a neutral line detection ring CT2, and a leakage detection unit coupled to the leakage detection ring CT1 (which includes a leakage detection chip U1 and related coupled electronic components (e.g., capacitor C2, etc.)). When there is a current imbalance between the phase line (L) and the neutral line (N) passing through the leakage detection ring CT1, that is, when there is a leakage current signal, a corresponding voltage signal will be generated on the leakage detection ring CT1, and the leakage detection chip U1 will control the first driving component Q4 to turn on by detecting that the leakage current signal on the leakage detection ring CT1 exceeds a preset value, thereby disconnecting the first auxiliary component Q5, and further driving the first coil RELAY2 to disconnect the switch module SW.

[0038] In this embodiment, the self-test module 2 is used to perform periodic functional checks on the leakage detection module 1. The self-test module 1 includes a power supply circuit, a periodic timing circuit, and a self-test pulse signal circuit that simulates a leakage fault signal. Figure 1 The power supply circuit includes a resistor R10 and a voltage regulator ZD1; the periodic timing circuit includes a resistor R13 and a timing element (e.g., a capacitor C11) connected in series to generate the interval of the self-test pulse signal; the self-test pulse signal circuit includes a fourth auxiliary component Q2, a comparator U2, a diode D6, a capacitor C14, a resistor R20, and electronic components such as resistors R7 and R17 respectively coupled to the transistor Q2. After the leakage detection device works, the self-test module 2 periodically applies a simulated leakage fault signal reaching a predetermined value to the leakage detection loop CT1.

[0039] Furthermore, in this embodiment, the fourth auxiliary component Q2 in the self-test module 2 is coupled to the first auxiliary component Q5 for driving the first auxiliary component Q5 to be disconnected based on the received self-test fault signal, so as to control the first coil RELAY2 to disconnect the switch module SW.

[0040] The working principle of this embodiment is as follows:

[0041] First, when the relay module 3 is coupled to the main line, the current passes through the diode D1, the resistors R5, R15 and R18 to turn on the first auxiliary component Q5, so that the phase line L, the fuse P1, the first coil RELAY2, the first auxiliary component Q5 and the neutral line N form a current loop, thereby driving the first coil RELAY2 to keep the switch module SW closed.

[0042] At the same time, the leakage detection module 1 obtains the working power through the diode D1 and the resistor R5 of the current limiting component, and the diode D2 of the self-test module 2 is turned on to provide the working power to the self-test module 2 .

[0043] When the leakage detection loop CT1 detects a leakage current signal (i.e., a ground fault signal), a corresponding voltage signal will be generated on the leakage detection loop CT1. The leakage detection chip U1 detects that the leakage current signal on the leakage detection loop CT1 exceeds a preset value, so as to trigger the first drive component Q4 to turn on through the diode D4 and the resistor R16 in the relay module 3. Since the first drive component Q4 is turned on, it pulls down Figure 1 The potential at point B causes the first auxiliary component Q5 to be disconnected, and then the first coil RELAY2 loses power, and then the switch module SW is controlled to be disconnected, thereby protecting the safety of people or property.

[0044] When the function of the leakage detection module 1 is lost (for example, the leakage detection ring CT1 is short-circuited or the leakage detection chip U1 is damaged, etc.), the fourth auxiliary component Q2 in the self-test module 2 periodically sends a self-test signal that cannot be fed back to the self-test module 2. Since the fourth auxiliary component Q2 is turned on, it pulls down Figure 1 The potential at point B causes the first auxiliary component Q5 to be disconnected, and then the first coil RELAY2 loses power, and then the switch module SW is controlled to be disconnected, thereby protecting the safety of people or property.

[0045] After the fuse-type leakage protection device stops working and before it starts working again, the second reset switch component RESET1 is triggered to turn off the first auxiliary component Q5 coupled thereto; this ensures that the first coil RELAY2 can be started normally again to enable the leakage protection device to work normally again.

[0046] In addition, when the first auxiliary component Q5 is short-circuited, when the second auxiliary component Q1 receives the self-test fault signal from the diode D6, the second auxiliary component Q1 is turned on and maintained, while pulling down Figure 1 The potential at point A causes the first coil RELAY2 connected in parallel with the second auxiliary component Q1 to lose power, so that the switch module SW is in a disconnected state; at the same time, as the current at point A increases sharply, the current passing through the fuse P1 increases, thereby disconnecting the fuse P1 and stopping the relay module 3.

[0047] The fuse-type leakage protection device disclosed in this embodiment can control the relay module to disconnect the switch module when detecting the ground fault and / or the fault of the leakage detection module. That is, the present invention can timely detect the potential safety hazards in the use of electrical appliances, thereby improving the safety performance of electrical products.

[0048] Example 2

[0049] Figure 2Another embodiment of a fusible leakage protection device is disclosed. In this embodiment, the fusible leakage protection device includes: a switch module SW, a leakage detection module 1, a self-test module 2 and a relay module 3. The structures and functions of the switch module SW, the leakage detection module 1 and the self-test module 2 are the same as those of the corresponding modules in Embodiment 1, and are not described in detail here.

[0050] In addition, if Figure 2 As shown, the relay module 3 includes: a current limiting component, a fuse P1, a first coil RELAY2, a first auxiliary component Q5, a second auxiliary component Q1, a first drive component Q4, a second reset switch component RESET1 and a fifth auxiliary component Q04. Among them, the structures and functions of the current limiting component, the fuse P1, the first coil RELAY2, the first auxiliary component Q5, the second auxiliary component Q1, the first drive component Q4 and the second reset switch component RESET1 are the same as those of the corresponding modules in Example 1, and are not repeated here.

[0051] In this embodiment, the fifth auxiliary component Q04 has a first end coupled to the first auxiliary component Q5, a second end coupled to the self-test module 2 and a third end coupled to the ground, and is used to drive the first auxiliary component Q5 to disconnect based on the received self-test fault signal to control the first coil RELAY2 to disconnect the switch module SW.

[0052] The working principle of this embodiment is the same as that of the working principle of embodiment 1 and is not described in detail here. The working principle of this embodiment is different from that of embodiment 1 in that:

[0053] When the leakage detection module 1 loses its function (for example, the leakage detection loop CT1 is short-circuited or the leakage detection chip U1 is damaged, etc.), the transistor Q2 in the self-test module 2 periodically sends a self-test signal that cannot be fed back to the self-test module 2, and the resistor R20 will charge the capacitor C14, so that the diode D6 is turned on (that is, a self-test fault signal is generated), which further triggers the fifth auxiliary component Q04 to turn on. Since the fifth auxiliary component Q04 is turned on, it pulls down Figure 2 The potential at point B causes the first auxiliary component Q5 to be disconnected, and then the first coil RELAY2 loses power, thereby controlling the switch module SW to be disconnected, thereby protecting the safety of people or property.

[0054] In addition, when the first auxiliary component Q5 is short-circuited, when the second auxiliary component Q1 receives the self-test fault signal from the diode D6, the second auxiliary component Q1 is turned on and maintained, while pulling down Figure 2The potential at point A causes the first coil RELAY2 connected in parallel with the second auxiliary component Q1 to lose power, so that the switch module SW is in a disconnected state; at the same time, as the current at point A increases sharply, the current passing through the fuse P1 increases, thereby disconnecting the fuse P1 and stopping the relay module 3.

[0055] The fusible leakage protection device disclosed in this embodiment can control the relay module to disconnect the switch module when detecting the ground fault and / or the fault of the leakage detection module. That is, the present invention can timely detect the potential safety hazard in the use of electrical appliances, take corresponding measures for the detected potential safety hazard, and timely disconnect the power connection of the fusible leakage protection device, thereby improving the safety performance of electrical products.

[0056] Example 3

[0057] like Figure 3 As shown, the fuse-type leakage protection device disclosed in this embodiment includes: a switch module SW, a leakage detection module 1, a self-test module 2 and a relay module 3. Among them, the structure and function of the switch module SW, the leakage detection module 1 and the self-test module 2 are the same as the structure and function of the corresponding modules disclosed in Example 1, and are not repeated here.

[0058] like Figure 3 As shown, the relay module 3 includes: a fuse P1, a second coil RELAY1, a third auxiliary component Q3, a current limiting component, a first coil RELAY2, a first auxiliary component Q5 and a first driving component Q4. The second coil RELAY1 is coupled to the input terminal LINE, and is used to control the switch module SW to close; the third auxiliary component Q3 is coupled to the second coil RELAY1, and is used to start the second coil RELAY1; the current limiting component is coupled to the input terminal LINE, and is used to provide working current to the relay module 3; the first coil RELAY2 is coupled to the current limiting component, and is used to control the state of the switch module SW; the first auxiliary component Q5 is coupled to the first coil RELAY2 and the current limiting component, and is used to start the first coil RELAY2; the first driving component Q4 is respectively coupled to the first auxiliary component Q5, the leakage detection module 1 and the self-test module 2, and is used to drive the first auxiliary component Q5 to open based on the leakage fault signal and / or the self-test fault signal, so as to control the first coil RELAY2 to make the switch module SW in the open state.

[0059] Specifically, Figure 3 As shown, the current limiting module at least includes: resistors R2 and R5 connected in series with the diode D1 , resistors R12 and R15 connected in series with the resistor R5 , and R18 connected in series between the resistor R15 and the first auxiliary component Q5 .

[0060] In addition, if Figure 3As shown, the relay module 3 also includes: a second auxiliary component Q1, a differential capacitor C8 and a first reset switch component RESET. The second auxiliary component Q1 is connected in parallel with the first coil RELAY2, and is connected in series between the fuse P1 and the first auxiliary component Q5, and is coupled to the leakage detection module 1 and the self-test module 2. The differential capacitor C8 is coupled between the current limiting component (for example, the resistor R12 in the current limiting component) and the third auxiliary component Q3, and is used to control the third auxiliary component Q3. One end of the first reset switch component RESET is coupled to the differential capacitor C8 and the other end is coupled to the ground, and is used to be triggered to close after the switch module SW is disconnected, so that the differential capacitor C8 is discharged, so as to realize the normal operation of the second coil RELAY1 by controlling the third auxiliary component Q3 to be turned on.

[0061] In this embodiment, based on Figure 3 In the circuit design shown, when the first driving component Q4 is turned on, the first auxiliary component Q5 is turned off; when the first driving component Q4 is turned off, the first auxiliary component Q5 is turned on.

[0062] The working principle of this embodiment is as follows:

[0063] First, when the relay module 3 is coupled to the trunk line, the current passes through the diode D1, the resistor R5, and the resistor R12, and charges the differential capacitor C8 to instantly turn on the third auxiliary component Q3, so that the phase line L, the second coil RELAY1, the third auxiliary component Q3 and the neutral line N form a current loop, and then the second coil RELAY1 drives the switch module SW to close; at the same time, the current supplies power to the first auxiliary component Q5 through the diode D1, the resistor R5, the resistor R15 and the resistor R18, so that the first auxiliary component Q5 is turned on, and then the first coil RELAY2 controls the state of the switch module SW. Subsequently, as the differential capacitor C8 continues to charge, the third auxiliary component Q3 is disconnected, and the second coil RELAY1 stops working.

[0064] At the same time, the leakage detection module 1 obtains the working power through the diode D1 and the resistor R5 of the current limiting component, and the diode D2 of the self-test module 2 is turned on to provide the working power to the self-test module 2 .

[0065] When the leakage detection loop CT1 detects a leakage current signal (i.e., a ground fault signal), a corresponding voltage signal will be generated on the leakage detection loop CT1. The leakage detection chip U1 detects that the leakage current signal on the leakage detection loop CT1 exceeds a preset value, so as to trigger the second auxiliary component Q1 and the first drive component Q4 to turn on through the diode D4 and the resistor R16 in the relay module 3. Since the first drive component Q4 is turned on, it pulls down Figure 3The potential at point B causes the first auxiliary component Q5 to be disconnected, and then the first coil RELAY2 loses power, and then the switch module SW is controlled to be disconnected, thereby protecting the safety of people or property.

[0066] When the function of the leakage detection module 1 is lost (for example, the leakage detection loop CT1 is short-circuited or the leakage detection chip U1 is damaged, etc.), the transistor Q2 in the self-test module 2 periodically sends a self-test signal that cannot be fed back to the self-test module 2, and the resistor R20 will charge the capacitor C14, so that the diode D6 is turned on (that is, a self-test fault signal is generated), which further triggers the second auxiliary component Q1 and the first drive component Q4 to turn on. Since the first drive component Q4 is turned on, it pulls down Figure 3 The potential at point B causes the first auxiliary component Q5 to be disconnected, and then the first coil RELAY2 loses power, thereby controlling the switch module SW to be disconnected, thereby protecting the safety of people or property.

[0067] In addition, while the self-test module 2 periodically sends out a self-test signal, although the second auxiliary component Q1 and the first drive component Q4 are triggered to turn on instantly, since the duration of the self-test signal is very short under normal conditions, the first auxiliary component Q5 is disconnected in a short time that is not enough to cause the first coil RELAY2 to disconnect the switch module SW.

[0068] After the fuse-type leakage protection device stops working and before it starts working again, the reset switch component RESET is triggered to discharge the differential capacitor C8 coupled thereto; this ensures that the second coil RELAY1 can be started normally again, so that the leakage protection device can work normally again.

[0069] In addition, when the first driving component Q4 is open, the first auxiliary component Q5 is turned on, that is, the first coil RELAY2 works normally. At this time, when the second auxiliary component Q1 receives the leakage fault signal and / or the self-test fault signal, the second auxiliary component Q1 is turned on, and then the Figure 3 The potential of point A in the middle is increased, and the first coil RELAY2 connected in parallel with the second auxiliary component Q1 is de-energized, so that the switch module SW is in the disconnected state; at the same time, as the current at point A increases sharply, the current passing through the fuse P1 increases, so that the fuse P1 is disconnected, and then the relay module 3 stops working.

[0070] When the first driving component Q4 is short-circuited, the first auxiliary component Q5 is turned off to disconnect the current loop of the first coil RELAY2, and thus the switch module SW is in an off state.

[0071] Further, when the first auxiliary component Q5 is open-circuited, the current loop of the first coil RELAY2 is disconnected and the second auxiliary component Q1 cannot be turned on, so that the switch module SW is in an off state.

[0072] In the case where the first auxiliary component Q5 is short-circuited, when the second auxiliary component Q1 receives a leakage fault signal and / or a self-test fault signal, the second auxiliary component Q1 is turned on and remains on, while pulling down Figure 3 The potential at point A causes the first coil RELAY2 connected in parallel with the second auxiliary component Q1 to lose power, so that the switch module SW is in a disconnected state; at the same time, as the current at point A increases sharply, the current passing through the fuse P1 increases, thereby disconnecting the fuse P1 and stopping the relay module 3.

[0073] In this embodiment, the disclosed third auxiliary component Q3, the first auxiliary component Q5, the first driving component Q4, the second auxiliary component Q1 and other components may be semiconductor elements such as MOS tubes, thyristors, and triodes.

[0074] The fuse-type leakage protection device disclosed herein can control the relay module to disconnect the switch module when a ground fault and / or a fault in the leakage detection module is detected. That is, the present invention can timely detect potential safety hazards in the use of electrical appliances, and take corresponding measures to eliminate the potential safety hazards, thereby ultimately improving the safety performance of electrical products.

[0075] Therefore, although the present invention is described with reference to specific examples, wherein these specific examples are intended to be illustrative only and not limiting of the present invention, it is obvious to those skilled in the art that the disclosed embodiments may be changed, added or deleted without departing from the spirit and scope of the present invention.

Claims

1. A fuse-type leakage protection device, characterized in that: include: A switch module, coupled between an input end and an output end of the trunk line, for controlling a power connection between the input end and the output end; A leakage detection module, coupled to the trunk line, for detecting whether there is a leakage fault signal at the output end of the trunk line; A self-check module, coupled to the trunk line and the leakage detection module, for periodically generating a self-check pulse signal simulating a leakage current signal to detect whether the leakage detection module fails; as well as A relay module, coupled to the trunk line, the switch module, the leakage detection module and the self-test module, for controlling the switching action of the switch module based on the received leakage fault signal and / or the self-test fault signal related to the leakage detection module, wherein the relay module at least comprises: a fuse coupled to the main line for disconnecting the relay module when a current passing through the fuse is too large; A first coil, coupled to the fuse, for controlling the state of the switch module; A first auxiliary component, coupled to the first coil, the leakage detection module and / or the self-test module, for controlling the first coil; and a second auxiliary component connected in series between the fuse and the first auxiliary component and coupled to at least the self-test module; When the first auxiliary component works normally, based on the leakage fault signal and / or the self-test fault signal, the first auxiliary component is disconnected to control the first coil to drive the switch module to be in an off state; or In the case that the first auxiliary component is short-circuited, based at least on the self-test fault signal, the second auxiliary component is turned on to increase the current passing through the fuse, and the fuse is opened to drive the relay module to disconnect.

2. The fuse-type leakage protection device according to claim 1, characterized in that: The relay module further includes a first driving component, which is coupled to at least the first auxiliary component and the leakage detection module and is used to drive the first auxiliary component to disconnect based on at least the leakage fault signal to control the first coil to put the switch module in an disconnected state.

3. The fuse-type leakage protection device according to claim 2, characterized in that: The first driving component is further coupled to the self-test module, and is used to drive the first auxiliary component to be disconnected based on the self-test fault signal, so as to control the first coil to put the switch module in an off state; and The second auxiliary component is further coupled to the leakage detection module.

4. The fuse-type leakage protection device according to claim 3, characterized in that: In the case where the first driving component is open-circuited, when the second auxiliary component receives the leakage fault signal and / or the self-test fault signal, the current passing through the fuse is increased, and the fuse is disconnected to disconnect the relay module.

5. The fuse-type leakage protection device according to claim 3, characterized in that: In the case where the first driving component is short-circuited, the first auxiliary component is disconnected to disconnect the current loop of the first coil and to put the switch module in an off state.

6. The fuse-type leakage protection device according to claim 3, characterized in that: When the first auxiliary component is open-circuited, the current loop of the first coil is disconnected, so that the switch module is in an off state.

7. The fuse-type leakage protection device according to claim 3, characterized in that: In the case where the first auxiliary component is short-circuited, when the second auxiliary component receives the leakage fault signal and / or the self-test fault signal, the second auxiliary component is turned on, increasing the current passing through the fuse, and disconnecting the fuse to disconnect the relay module.

8. The fuse-type leakage protection device according to claim 3, characterized in that: When the first driving component is turned on, the first auxiliary component is turned off; when the first driving component is turned off, the first auxiliary component is turned on.

9. The fuse-type leakage protection device according to claim 3, characterized in that: The relay module further comprises: A second coil, coupled to the main line, for controlling the switch module to close; A third auxiliary component is coupled to the second coil and is used to activate the second coil.

10. The fuse-type leakage protection device according to claim 9, characterized in that: The relay module further comprises: a differential capacitor coupled between the third auxiliary component and used for controlling the third auxiliary component; The first reset switch component has one end coupled to the differential capacitor and the other end coupled to the ground, and is used to be triggered to close after the switch module is disconnected, so as to discharge the differential capacitor and realize the normal operation of the second coil by controlling the third auxiliary component to be turned on.

11. The fuse-type leakage protection device according to claim 2, characterized in that: The self-check module at least includes: A fourth auxiliary component is coupled to the first auxiliary component and is used to drive the first auxiliary component to be turned off based on the received self-test fault signal, so as to control the first coil to turn off the switch module.

12. The fuse-type leakage protection device according to claim 2, characterized in that: The relay module also includes: A fifth auxiliary component, whose first end is coupled to the first auxiliary component, the second end is coupled to the self-test module and the third end is coupled to the ground, is used to drive the first auxiliary component to disconnect based on the received self-test fault signal to control the first coil to disconnect the switch module.

13. The fuse type leakage protection device according to claim 11 or 12, characterized in that: The relay module also includes: A second reset switch component, one end of which is coupled to the first drive component and the other end of which is coupled to the ground, is used to be triggered to close after the switch module is disconnected, so that the first drive component is turned off, so that the switch module is in a closed state by controlling the first auxiliary component to be turned on.

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