Safety leakage protection device

Abstract

The present invention discloses a safety leakage protection device, which includes: a switch module, a first drive control module, a second drive control module, a leakage detection module and an isolation coupling module. The switch module is coupled between the input end and the output end of the main line, and is used to control the power connection between the input end and the output end; the first drive control module is coupled to the input end, and is used to close the switch module; the second drive control module is coupled to the output end, and is used to disconnect the switch module; the leakage detection module is coupled to the main line and the second drive control module respectively, and is used to detect whether there is a leakage fault at the output end of the main line; the isolation coupling module is coupled between the first drive control module and the second drive control module, and is used to disconnect the first drive control module after the switch module is closed. The disclosed safety leakage protection device can reduce energy consumption and improve the safety performance of the leakage protection device.

Description

Technical Field

[0001] The invention relates to the electrical field, and in particular to a safety type leakage protection device. Background Art

[0002] As the use of leakage protection devices becomes more and more widespread, people pay more and more attention to the safety of use, working energy consumption, service life, etc. of leakage protection devices. The existing leakage protection devices have high energy consumption and high temperature rise of the coil and the product because the coil is continuously energized during operation. If there is interference or failure in the power grid, the coil may be burned, thereby reducing the safety of the leakage protection device, making the existing leakage protection device have serious safety hazards. Summary of the invention

[0003] The purpose of the present invention is to solve at least one aspect of the above-mentioned problems and defects in the prior art.

[0004] In view of the above problems, the present disclosure proposes a safety leakage protection device, which includes:

[0005] 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;

[0006] A first driving control module, coupled to the input terminal, for closing the switch module;

[0007] A second driving control module, coupled to the output terminal, for disconnecting the switch module;

[0008] a leakage detection module, which is coupled to the trunk line and the second drive control module respectively, and is used to detect whether there is a leakage fault at the output end of the trunk line; and

[0009] An isolation coupling module is coupled between the first drive control module and the second drive control module, and is used to disconnect the first drive control module after the switch module is closed.

[0010] In one embodiment, the second drive control module at least includes

[0011] a first diode coupled to the output terminal;

[0012] a second diode coupled to the output terminal;

[0013] a second coil, a first end of which is coupled to the first diode;

[0014] a first transistor coupled to the second end of the second coil and the ground, respectively; and

[0015] An undervoltage protection unit is coupled to the first diode, the second diode and the first transistor respectively, and is used to control the second drive control module to disconnect the switch module when the switch module is closed and the load terminal voltage is lower than a first preset value.

[0016] In one implementation, the undervoltage protection unit at least includes:

[0017] a current limiting resistor coupled to the first diode, the first end of the second coil and the energy storage component;

[0018] A discharge diode connected in parallel with the current limiting resistor;

[0019] a driving resistor coupled between the second end of the second coil and the first transistor;

[0020] a first voltage dividing resistor coupled to the second diode;

[0021] A second voltage-dividing resistor coupled between the first voltage-dividing resistor and ground; and

[0022] The second transistor is coupled to the first voltage-dividing resistor, the second voltage-dividing resistor, the first transistor and the ground respectively.

[0023] In one embodiment, when the switch module is closed, when the load terminal voltage is lower than the first preset value, the voltage of the second voltage-dividing resistor causes the second transistor to be cut off and simultaneously triggers the first transistor to be turned on, so that the second coil is energized and the switch module is controlled to be disconnected.

[0024] In one embodiment, the first drive control module at least includes:

[0025] a third diode coupled to the input terminal;

[0026] a third voltage-dividing resistor coupled to the third diode;

[0027] a fourth voltage-dividing resistor, coupled between the third voltage-dividing resistor and ground;

[0028] a third transistor, which is respectively coupled to the third voltage-dividing resistor, the fourth voltage-dividing resistor and ground; and

[0029] The first coil is coupled between the input terminal and the third transistor.

[0030] In one embodiment, when the first drive control module is coupled to the input end and the power supply voltage of the input end reaches a second preset value, the voltage of the fourth voltage-dividing resistor triggers the third transistor to turn on, so that the first coil is energized and the switch module is controlled to close.

[0031] In one implementation, the isolation coupling module at least includes:

[0032] an isolation coupling processing unit, a primary portion of which is coupled to the output terminal;

[0033] A fourth transistor is coupled to the first driving control module and a secondary part of the isolation coupling processing unit respectively.

[0034] In one implementation, when the first drive control module controls the switch module to close and the load-end power supply is turned on, the fourth transistor of the isolation coupling module is turned on to control the first drive control module to stop working.

[0035] In one implementation, when the leakage detection module detects the leakage fault, it sends a leakage fault signal related to the leakage fault to the second drive control module to trigger the first transistor to turn on, so that the second coil is energized and the switch module is controlled to be disconnected.

[0036] In one embodiment, the safety leakage protection device further includes:

[0037] A reset module is coupled to the first drive control module and the isolation coupling module respectively, and is used to control the fourth transistor to be cut off so as to reset the first drive control module and the isolation coupling module when the first drive control module stops working.

[0038] In one embodiment, the transistor is any switch element among thyristor, triode and MOS tube.

[0039] In one implementation, the isolation coupling processing unit is any isolation coupling device among photoelectric coupler, relay, and transformer.

[0040] On the other hand, the present disclosure also proposes a safety leakage protection device, which includes:

[0041] 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;

[0042] A first driving control module, coupled to the input terminal, for closing the switch module;

[0043] A second driving control module, coupled to the output terminal, for disconnecting the switch module;

[0044] A leakage detection module, which is coupled to the trunk line and the second drive control module respectively, and is used to detect whether there is a leakage fault at the output end of the trunk line;

[0045] an isolation coupling module, coupled between the first drive control module and the second drive control module, and configured to disconnect the first drive control module after the switch module is closed; and

[0046] The steady-current driving module is coupled to the first driving control module and is used to provide a stable trigger current for the first driving control module.

[0047] In one embodiment, the second drive control module at least includes:

[0048] a first diode coupled to the output terminal;

[0049] a second diode coupled to the output terminal;

[0050] a second coil, a first end of which is coupled to the first diode;

[0051] a first transistor coupled to the second end of the second coil and the ground, respectively; and

[0052] An undervoltage protection unit is coupled to the first diode, the second diode and the first transistor respectively, and is used to control the second drive control module to disconnect the switch module when the switch module is closed and the load terminal voltage is lower than a first preset value.

[0053] In one implementation, the undervoltage protection unit at least includes:

[0054] a current limiting resistor, which is respectively coupled to the first diode, the first end of the second coil and the energy storage component;

[0055] A discharge diode connected in parallel with the current limiting resistor;

[0056] a driving resistor coupled between the second end of the second coil and the first transistor;

[0057] a first voltage dividing resistor coupled to the second diode;

[0058] A second voltage-dividing resistor coupled between the first voltage-dividing resistor and ground; and

[0059] The second transistor is coupled to the first voltage-dividing resistor, the second voltage-dividing resistor, the first transistor and the ground respectively.

[0060] In one embodiment, when the switch module is closed, when the load terminal voltage is lower than the first preset value, the voltage of the second voltage-dividing resistor causes the second transistor to be cut off and simultaneously triggers the first transistor to be turned on, so that the second coil is energized and the switch module is controlled to be disconnected.

[0061] In one embodiment, the first drive control module at least includes:

[0062] a third diode coupled to the input terminal;

[0063] a third voltage-dividing resistor coupled to the third diode;

[0064] a fourth voltage-dividing resistor, coupled between the third voltage-dividing resistor and ground;

[0065] A third transistor coupled between the third voltage-dividing resistor and the fourth voltage-dividing resistor via the current-stabilizing driving module; and

[0066] The first coil is coupled between the input terminal and the third transistor.

[0067] In one embodiment, the steady current driving module at least includes:

[0068] a third resistor coupled to the third diode;

[0069] a fifth transistor, coupled to the third resistor, the third voltage-dividing resistor, and the fourth voltage-dividing resistor respectively; and

[0070] The first capacitor is coupled between the third resistor and ground.

[0071] In one embodiment, when the first drive control module is coupled to the input end and the power supply voltage of the input end reaches a second preset value, the voltage of the fourth voltage-dividing resistor triggers the fifth transistor to turn on, so as to provide a stable trigger current to the third transistor, thereby energizing the first coil and controlling the switch module to close.

[0072] In one implementation, the isolation coupling module at least includes:

[0073] an isolation coupling processing unit, a primary portion of which is coupled to the output terminal;

[0074] A fourth transistor is coupled to the first driving control module and a secondary part of the isolation coupling processing unit respectively.

[0075] In one implementation, when the first drive control module controls the switch module to close and the load-end power supply is turned on, the fourth transistor of the isolation coupling module is turned on to control the first drive control module to stop working.

[0076] In one implementation, when the leakage detection module detects the leakage fault, it sends a leakage fault signal related to the leakage fault to the second drive control module to trigger the first transistor to turn on, so that the second coil is energized and the switch module is controlled to be disconnected.

[0077] In one embodiment, the safety leakage protection device further includes:

[0078] A reset module is respectively coupled to the first drive control module, the steady-current drive module and the isolation coupling module, and is used to control the fifth transistor and the fourth transistor to be cut off when the first drive control module stops working, so as to reset the first drive control module, the steady-current drive module and the isolation coupling module.

[0079] In one embodiment, the transistor is any switch element among thyristor, triode and MOS tube.

[0080] In one implementation, the isolation coupling processing unit is any isolation coupling device among photoelectric coupler, relay, and transformer.

[0081] The safety leakage protection device disclosed in the present invention can realize leakage protection of the electrical equipment to be protected by utilizing the division of labor and cooperation of multiple coils in its structure, without making these coils in a long-term energized state during operation, and at the same time ensure that when the power supply voltage is lower than the set value (that is, undervoltage state), the power connection between the input end and the output end is disconnected. Therefore, compared with the prior art, the disclosed safety leakage protection device has the advantages of low energy consumption and long coil life, and can also improve the safety of the leakage protection device and improve the user's satisfaction. BRIEF DESCRIPTION OF THE DRAWINGS

[0082] The features, advantages and other aspects of the embodiments of the present disclosure will become more apparent with reference to the following detailed description in conjunction with the accompanying drawings, in which several embodiments of the present disclosure are shown in an exemplary and non-limiting manner. In the accompanying drawings:

[0083] Figure 1 A schematic diagram showing the circuit structure of a first embodiment of a safety leakage protection device according to the present invention; and

[0084] Figure 2 A circuit structure diagram of a second embodiment of a safety leakage protection device according to the present invention is shown. DETAILED DESCRIPTION

[0085] 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.

[0086] 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.

[0087] The embodiments of the present disclosure mainly focus on the following technical issues: how to reduce the potential safety hazards of leakage protection devices during use and improve user satisfaction.

[0088] In order to solve the above problems, this paper discloses a safety leakage protection device, which includes: a switch module, a first drive control module, a second drive control module, a leakage detection module and an isolation coupling module. The switch module is used to control the power connection between the input end and the output end; the first drive control module is used to close the switch module; the second drive control module is used to disconnect the switch module; the leakage detection module is used to detect whether there is a leakage fault at the output end of the trunk line; the isolation coupling module is used to disconnect the first drive control module after the switch module is closed.

[0089] Example 1

[0090] like Figure 1 As shown, the safety leakage protection device disclosed in this embodiment includes: a switch module SW, a first drive control module 1, a second drive control module 2, a leakage detection module 4 and an isolation coupling module 3. The switch module SW 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 first drive control module 1 is coupled to the input end, and is used to close the switch module SW; the second drive control module 2 is coupled to the output end, and is used to disconnect the switch module SW; the leakage detection module 4 is coupled to the trunk line and the second drive control module 2, respectively, and is used to detect whether there is a leakage fault at the output end of the trunk line; the isolation coupling module 3 is coupled between the first drive control module 1 and the second drive control module 2, and is used to disconnect the first drive control module 1 after the switch module SW is closed.

[0091] like Figure 1 As shown, the first driving control module 1 at least includes: a third diode D1, a third voltage-dividing resistor R3, a fourth voltage-dividing resistor R24, a third transistor Q1 and a first coil SOL1. In this embodiment, the third diode D1 is coupled to the input terminal, the third voltage-dividing resistor R3 is coupled to the third diode D1, the fourth voltage-dividing resistor R24 ​​is coupled between the third voltage-dividing resistor R3 and the ground, the third transistor Q1 is respectively coupled to the third voltage-dividing resistor R3, the fourth voltage-dividing resistor R24 ​​and the ground, and the first coil SOL1 is coupled between the input terminal and the third transistor Q1.

[0092] In addition, if Figure 1 As shown, the first drive control module 1 further includes a current limiting resistor R2, a filter capacitor C2, a diode D10, a capacitor C3 and a resistor R18.

[0093] When the first drive control module 1 is coupled to the input end and the power supply voltage of the input end reaches a second preset value (for example, 70% of the rated voltage), the voltage of the fourth voltage-dividing resistor R24 ​​triggers the third transistor Q1 to turn on, so that the first coil SOL1 is energized and the switch module SW is controlled to close, thereby realizing the power connection between the main line input end and the output end.

[0094] like Figure 1 As shown, the isolation coupling module 3 at least includes: an isolation coupling processing unit U2 and a fourth transistor Q3. In this embodiment, the primary part of the isolation coupling processing unit U2 is coupled to the output end; and the fourth transistor Q3 is respectively coupled to the first drive control module 1 and the secondary part of the isolation coupling processing unit U2.

[0095] In this embodiment, the isolation coupling module 3 further includes: a first resistor R31 and a second resistor R16. The first resistor R31 is coupled to the second drive control module 2; the primary part of the isolation coupling processing unit U2 is coupled to the output end via the first resistor R31; and the second resistor R16 is coupled to the secondary part of the isolation coupling processing unit U2 and the first drive control module 1, respectively.

[0096] Specifically, the control electrode of the fourth transistor Q3 is coupled to the ground via the capacitor C8, and the control electrode of the fourth transistor Q3 is coupled to the secondary part of the isolation coupling processing unit U2, the cathode of the fourth transistor Q3 is coupled to the ground, and the anode of the fourth transistor Q3 is coupled to the control electrode of the third transistor Q1 of the first driving module 1. In this embodiment, the isolation coupling processing unit U2 can be any one of isolation coupling components such as a photocoupler, a relay, and a transformer.

[0097] When the first driving control module 1 controls the switch module SW to be closed and the load-end power supply is turned on, the fourth transistor Q3 of the isolation coupling module 3 is turned on to control the first driving control module 1 to stop working.

[0098] like Figure 1 As shown, the second driving control module 2 at least includes: a first diode D4, a second diode D3, a second coil SOL2, a first transistor Q2 and an undervoltage protection unit 21. In this embodiment, the first diode D4 and the second diode D3 are both coupled to the output end; the first end of the second coil SOL2 is coupled to the first diode D4; the first transistor Q2 is respectively coupled to the second end of the second coil SOL2 and the ground; the undervoltage protection unit 21 is respectively coupled to the first diode D4, the second diode D3 and the first transistor Q2, and is used to control the second driving control module 2 to disconnect the switch module SW when the switch module SW is closed and the load terminal voltage is lower than the first preset value.

[0099] Specifically, the second driving control module 2 further includes: a charging capacitor C11, a capacitor C12, resistors R26, R23 and the like.

[0100] Further, the undervoltage protection unit 21 at least includes: a current limiting resistor R10, a discharge diode D2, a driving resistor R19, a first voltage dividing resistor R17, a second voltage dividing resistor R28 and a second transistor Q5. The current limiting resistor R10 is respectively coupled to the first diode D4, the first end of the second coil SOL2 and the energy storage component (for example, Figure 1 The capacitor C11 in the circuit); the discharge diode D2 is connected in parallel with the current limiting resistor R10; the driving resistor R19 is coupled between the second end of the second coil SOL2 and the first transistor Q2; the first voltage-dividing resistor R17 is coupled to the second diode D3; the second voltage-dividing resistor R28 is coupled between the first voltage-dividing resistor R17 and the ground; the second transistor Q5 is respectively coupled to the first voltage-dividing resistor R17, the second voltage-dividing resistor R28, the first transistor Q2 and the ground.

[0101] When the switch module SW is closed, when the load terminal voltage is lower than a first preset value (for example, 60% of the set rated voltage), the voltage of the second voltage-dividing resistor R28 causes the second transistor Q5 to be turned off, and at the same time triggers the first transistor Q2 to be turned on, so that the second coil SOL2 is energized and the switch module SW is controlled to be disconnected.

[0102] like Figure 1As shown, in this embodiment, the leakage detection module 4 includes: a leakage detection coil CT, a resistor R22, a resistor R27, a capacitor C1, a leakage detection chip U1, and a diode D8. When the leakage detection module 4 detects a leakage fault, a leakage fault signal related to the leakage fault is sent to the second drive control module 2 to trigger the first transistor Q2 to turn on, so that the second coil SOL2 is energized and the switch module SW is controlled to be disconnected.

[0103] also, Figure 1 Also shown is a reset module (ie, Figure 1 The reset switch shown in FIG. 1 is respectively coupled to the first drive control module 1 and the isolation coupling module 3, and is used to control the fourth transistor Q3 to be turned off to reset the first drive control module 1 and the isolation coupling module 3 when the first drive control module 1 stops working.

[0104] Each transistor used in this embodiment can be selected from one or more semiconductor devices or switch devices such as thyristors, triodes, MOS tubes, etc.

[0105] The working principle of this embodiment is as follows:

[0106] When the input power supply of the main line is turned on, when the input voltage reaches a second preset value, the electrical signal is rectified by the third diode D1 in the first drive control module 1, limited by the current limiting resistor R2, and filtered by the filter capacitor C2. Then, the electrical signal is divided by the third voltage-dividing resistor R3 and the fourth voltage-dividing resistor R24, and the processed electrical signal is provided to the third transistor Q1 through the diode D10 to trigger the third transistor Q1 to turn on, so that the first coil SOL1 is energized and the switch module SW is controlled to close, thereby realizing the power connection between the input and output ends of the main line.

[0107] On the contrary, when the input voltage does not reach the second preset value, the electrical signal is rectified by the third diode D1 in the first drive control module 1, limited by the current limiting resistor R2, and filtered by the filter capacitor C2. Then, the electrical signal is divided by the third voltage-dividing resistor R3 and the fourth voltage-dividing resistor R24, and the processed electrical signal is provided to the third transistor Q1 through the diode D10. If the electrical signal is not sufficient to trigger the third transistor Q1, the third transistor Q1 is cut off and cannot trigger the first coil SOL1 to work, then the switch module SW is still in the disconnected state, and the power connection between the input and output ends of the main line cannot be achieved.

[0108] When the switch module SW is in a closed state, the load-end power supply is turned on, so that the primary part of the isolation coupling processing unit U2 in the isolation coupling module 3 forms a current loop with the live wire and the neutral wire via the second diode D3 and the first resistor R31, and the secondary part of the triggered isolation coupling processing unit U2 is turned on, so that the electrical signal of the input-end power supply triggers the fourth transistor Q3 to turn on through the third diode D1, the current limiting resistor R2, the second resistor R16 and the secondary part of the isolation coupling processing unit U2, so that Figure 1 The potential at point A in the circuit is reduced and the third transistor Q1 is turned off, eventually controlling the first coil SQL1 to stop working.

[0109] In addition, when the load-end power reaches the first preset value, the voltage of the second voltage-dividing resistor R28 in the second drive control module 2 can trigger the second transistor Q5 to turn on. Figure 1 The voltage at point C in the circuit decreases, thereby turning off the first transistor Q2.

[0110] On the contrary, when the load-end power supply does not reach the first preset value, the voltage of the second voltage-dividing resistor R28 in the second drive control module 2 cannot trigger the second transistor Q5 to turn on. Figure 1 The voltage at point C in the circuit increases, and the first transistor Q2 is turned on. Then the live wire, the first diode D4, the second coil SOL2, the first transistor Q2 and the neutral wire form a current loop, so that the second coil SOL2 generates a magnetic field, thereby controlling the switch module SW to disconnect, and finally cutting off the power connection between the input end and the output end.

[0111] In addition, when the leakage detection coil CT detects a leakage fault, a leakage fault signal (e.g., a leakage current signal) related to the leakage fault is transmitted to the leakage detection chip U1 via the resistor R22. When the leakage current signal exceeds a preset value, the leakage detection chip U1 sends a leakage fault signal, and drives the first transistor Q2 to conduct through the diode D8, thereby causing the second coil SOL2 to generate a magnetic field, controlling the switch module SW to disconnect, and finally cutting off the power connection between the input end and the output end.

[0112] In addition, when the leakage protection device needs to be reset (for example, the leakage protection device stops working), the reset module (that is, the reset switch) is controlled to work. Figure 1 The potential at point A is pulled down, and the fourth transistor Q3 is turned off, thereby resetting the first drive control module 1 and the isolation coupling module 3, which can ensure that the first drive control module 1 and the isolation coupling module 3 work normally thereafter.

[0113] The safety leakage protection device disclosed in this embodiment includes components such as a first coil, a second coil, and an isolation coupling module, so that it can ensure that the first coil and the second coil do not need to be in a powered state for a long time during normal operation, thereby reducing energy consumption and reducing the temperature rise of the coil and other internal components of the safety leakage protection device. When a fault (for example, power grid interference) occurs, the frequency of coil burning can be reduced, thereby improving the safety of the leakage protection device.

[0114] Example 2

[0115] like Figure 2 As shown, the safety leakage protection device disclosed in this embodiment includes: a switch module SW, a first drive control module 1, a second drive control module 2, a leakage detection module 4, an isolation coupling module 3 and a steady current drive module 11. The switch module SW 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 first drive control module 1 is coupled to the input end, and is used to close the switch module SW; the second drive control module 2 is coupled to the output end, and is used to disconnect the switch module SW; the leakage detection module 4 is coupled to the trunk line and the second drive control module 2 respectively, and is used to detect whether there is a leakage fault at the output end of the trunk line; the isolation coupling module 3 is coupled between the first drive control module 1 and the second drive control module 2, and is used to disconnect the first drive control module 1 after the switch module SW is closed; the steady current drive module 11 is coupled to the first drive control module 1, and is used to provide a stable trigger current for the first drive control module 1.

[0116] In this embodiment, the structure and principle of the second drive control module 2, the leakage detection module 4, the isolation coupling module 3, and the undervoltage protection unit 21 in the second drive control module 2 are similar to the structure and principle of the second drive control module 2, the leakage detection module 4, the isolation coupling module 3, and the undervoltage protection unit 21 in the second drive control module 2 in Example 1, and are not repeated here.

[0117] like Figure 2 As shown, the first driving control module 1 at least includes: a third diode D1, a third voltage-dividing resistor R8, a fourth voltage-dividing resistor R24, a third transistor Q1 and a first coil SOL1. In this embodiment, the third diode D1 is coupled to the input terminal, the third voltage-dividing resistor R8 is coupled to the third diode D1, the fourth voltage-dividing resistor R24 ​​is coupled between the third voltage-dividing resistor R8 and the ground, the third transistor Q1 is coupled between the third voltage-dividing resistor R8 and the fourth voltage-dividing resistor R24 ​​via the steady current driving module 11, and the first coil SOL1 is coupled between the input terminal and the third transistor Q1.

[0118] In addition, if Figure 2As shown, the first driving control module 1 further includes a resistor R12, a capacitor C3, and a resistor R18.

[0119] like Figure 2 As shown, the current-stabilizing driving module 11 at least includes: a third resistor R4 coupled to a third diode D1, a fifth transistor Q4 respectively coupled to the third resistor R4, a third voltage-dividing resistor R8 and a fourth voltage-dividing resistor R24, and a first capacitor C2 coupled between the third resistor R4 and ground.

[0120] The specific working principles of the first drive control module 1 and the steady current drive module 11 of this embodiment are as follows:

[0121] When the first drive control module 1 is coupled to the input end and the power supply voltage of the input end reaches a second preset value (for example, 70% of the rated voltage), the voltage of the fourth voltage-dividing resistor R24 ​​triggers the fifth transistor Q4 of the current-stabilizing drive module 11 to turn on, so as to provide a stable trigger current to the third transistor Q1, so that the first coil SOL1 is energized and the switch module SW is controlled to close, thereby realizing the power connection between the input end and the output end of the main line.

[0122] In Embodiment 1, the first drive control module 1 triggers the third transistor Q1 by the pulse trigger current to control the first coil SOL1 to be energized and close the switch module SW. Compared with Embodiment 1, the constant current drive module 11 can use the first capacitor C2 and the fifth transistor Q4 to provide a stable trigger current to the third transistor Q1, thereby ensuring that any phase angle of the AC power supply at the input end can trigger the third transistor Q1, that is, the conduction time of the first drive control module 1 is extended in the same power supply cycle.

[0123] In Embodiment 2, when the leakage protection device needs to be reset (for example, the leakage protection device stops working), the reset module (that is, the reset switch) is controlled to work. Figure 2 The potentials at points A and B are pulled down, and the fifth transistor Q4 and the fourth transistor Q3 are turned off, thereby resetting the first drive control module 1, the steady-current drive unit 11 and the isolation coupling module 3, thereby ensuring that the first drive control module 1, the steady-current drive unit 11 and the isolation coupling module 3 work normally thereafter.

[0124] The safety leakage protection device disclosed in this embodiment includes components such as a first coil, a second coil, an isolation coupling module, and a current stabilization drive module, so that it can ensure that the first coil and the second coil do not need to be in a powered state for a long time during normal operation, thereby reducing energy consumption and reducing the temperature rise of the coil and other internal components of the safety leakage protection device; at the same time, the disclosed safety leakage protection device can improve the stability of the power connection between the input and output ends of the main line; and when encountering a fault (for example, power grid interference), it can reduce the frequency of coil burning, thereby improving the safety of use of the leakage protection device.

[0125] The above are only optional embodiments of the embodiments of the present disclosure, and are not intended to limit the embodiments of the present disclosure. For those skilled in the art, the embodiments of the present disclosure may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the embodiments of the present disclosure shall be included in the protection scope of the embodiments of the present disclosure.

[0126] Although the embodiments of the present disclosure have been described with reference to several specific embodiments, it should be understood that the embodiments of the present disclosure are not limited to the specific embodiments disclosed. The embodiments of the present disclosure are intended to cover various modifications and equivalent arrangements included in the spirit and scope of the appended claims. The scope of the appended claims is consistent with the broadest interpretation, thereby including all such modifications and equivalent structures and functions.

Claims

1. A safety leakage protection device, characterized in that: The safety leakage protection device comprises: 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 first driving control module, coupled to the input terminal, for closing the switch module; A second driving control module, coupled to the output terminal, for disconnecting the switch module; a leakage detection module, which is coupled to the trunk line and the second drive control module respectively, and is used to detect whether there is a leakage fault at the output end of the trunk line; and An isolation coupling module is coupled between the first drive control module and the second drive control module, and is used to disconnect the first drive control module after the switch module is closed.

2. The safety leakage protection device according to claim 1, characterized in that: The second drive control module at least includes: a first diode coupled to the output terminal; a second diode coupled to the output terminal; a second coil, a first end of which is coupled to the first diode; a first transistor coupled to the second end of the second coil and the ground, respectively; and An undervoltage protection unit is coupled to the first diode, the second diode and the first transistor respectively, and is used to control the second drive control module to disconnect the switch module when the switch module is closed and the load terminal voltage is lower than a first preset value.

3. The safety leakage protection device according to claim 2, characterized in that: The undervoltage protection unit at least includes: a current limiting resistor coupled to the first diode, the first end of the second coil and the energy storage component; A discharge diode connected in parallel with the current limiting resistor; a driving resistor coupled between the second end of the second coil and the first transistor; a first voltage dividing resistor coupled to the second diode; A second voltage-dividing resistor coupled between the first voltage-dividing resistor and ground; and The second transistor is coupled to the first voltage-dividing resistor, the second voltage-dividing resistor, the first transistor and the ground respectively.

4. The safety leakage protection device according to claim 3, characterized in that: When the switch module is closed, and the load terminal voltage is lower than the first preset value, the voltage of the second voltage-dividing resistor turns off the second transistor and triggers the first transistor to turn on, so that the second coil is energized and the switch module is controlled to be disconnected.

5. The safety leakage protection device according to claim 1, characterized in that: The first drive control module at least includes: a third diode coupled to the input terminal; a third voltage-dividing resistor coupled to the third diode; a fourth voltage-dividing resistor, coupled between the third voltage-dividing resistor and ground; a third transistor, which is respectively coupled to the third voltage-dividing resistor, the fourth voltage-dividing resistor and ground; and The first coil is coupled between the input terminal and the third transistor.

6. The safety leakage protection device according to claim 5, characterized in that: When the first drive control module is coupled to the input terminal and the power supply voltage of the input terminal reaches a second preset value, the voltage of the fourth voltage-dividing resistor triggers the third transistor to turn on, so as to energize the first coil and control the switch module to close.

7. The safety leakage protection device according to claim 1, characterized in that: The isolation coupling module at least includes: an isolation coupling processing unit, a primary portion of which is coupled to the output terminal; A fourth transistor is coupled to the first driving control module and a secondary part of the isolation coupling processing unit respectively.

8. The safety leakage protection device according to claim 7, characterized in that: When the first driving control module controls the switch module to be closed and the load-end power supply is turned on, the fourth transistor of the isolation coupling module is turned on to control the first driving control module to stop working.

9. The safety leakage protection device according to claim 2, characterized in that: When the leakage detection module detects the leakage fault, a leakage fault signal related to the leakage fault is sent to the second drive control module to trigger the first transistor to turn on, so that the second coil is energized and the switch module is controlled to be disconnected.

10. The safety leakage protection device according to claim 7, characterized in that: The safety leakage protection device also includes: A reset module is coupled to the first drive control module and the isolation coupling module respectively, and is used to control the fourth transistor to be cut off so as to reset the first drive control module and the isolation coupling module when the first drive control module stops working.

11. The safety leakage protection device according to any one of claims 2, 3, 4 and 9, characterized in that: The first transistor is any switch element among thyristor, triode and MOS tube.

12. The safety leakage protection device according to claim 3 or 4, characterized in that: The second transistor is any switch element among thyristor, triode and MOS tube.

13. The safety leakage protection device according to claim 5 or 6, characterized in that: The third transistor is any switch element among thyristor, triode and MOS tube.

14. The safety leakage protection device according to any one of claims 7, 8 and 10, characterized in that: The fourth transistor is any switch element among thyristor, triode and MOS tube.

15. The safety leakage protection device according to claim 7, characterized in that: The isolation coupling processing unit is any isolation coupling device among a photoelectric coupler, a relay and a transformer.

16. A safety leakage protection device, characterized in that: The safety leakage protection device comprises: 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 first driving control module, coupled to the input terminal, for closing the switch module; A second driving control module, coupled to the output terminal, for disconnecting the switch module; A leakage detection module, which is coupled to the trunk line and the second drive control module respectively, and is used to detect whether there is a leakage fault at the output end of the trunk line; an isolation coupling module, coupled between the first drive control module and the second drive control module, and configured to disconnect the first drive control module after the switch module is closed; and The steady-current driving module is coupled to the first driving control module and is used to provide a stable trigger current for the first driving control module.

17. The safety leakage protection device according to claim 16, characterized in that: The second drive control module at least includes: a first diode coupled to the output terminal; a second diode coupled to the output terminal; a second coil, a first end of which is coupled to the first diode; a first transistor coupled to the second end of the second coil and the ground, respectively; and An undervoltage protection unit is coupled to the first diode, the second diode and the first transistor respectively, and is used to control the second drive control module to disconnect the switch module when the switch module is closed and the load terminal voltage is lower than a first preset value.

18. The safety leakage protection device according to claim 17, characterized in that: The undervoltage protection unit at least includes: a current limiting resistor coupled to the first diode, the first end of the second coil, and the energy storage component; A discharge diode connected in parallel with the current limiting resistor; a driving resistor coupled between the second end of the second coil and the first transistor; a first voltage dividing resistor coupled to the second diode; A second voltage-dividing resistor coupled between the first voltage-dividing resistor and ground; and The second transistor is coupled to the first voltage-dividing resistor, the second voltage-dividing resistor, the first transistor and the ground respectively.

19. The safety leakage protection device according to claim 18, characterized in that: When the switch module is closed, and the load terminal voltage is lower than the first preset value, the voltage of the second voltage-dividing resistor turns off the second transistor and triggers the first transistor to turn on, so that the second coil is energized and the switch module is controlled to be disconnected.

20. The safety leakage protection device according to claim 16, characterized in that: The first drive control module at least includes: a third diode coupled to the input terminal; a third voltage-dividing resistor coupled to the third diode; a fourth voltage-dividing resistor, coupled between the third voltage-dividing resistor and ground; A third transistor coupled between the third voltage-dividing resistor and the fourth voltage-dividing resistor via the current-stabilizing driving module; and The first coil is coupled between the input terminal and the third transistor.

21. The safety leakage protection device according to claim 20, characterized in that: The steady current driving module at least comprises: a third resistor coupled to the third diode; a fifth transistor, coupled to the third resistor, the third voltage-dividing resistor, and the fourth voltage-dividing resistor respectively; and The first capacitor is coupled between the third resistor and ground.

22. The safety leakage protection device according to claim 21, characterized in that: When the first drive control module is coupled to the input end and the power supply voltage of the input end reaches a second preset value, the voltage of the fourth voltage-dividing resistor triggers the fifth transistor to turn on, so as to provide a stable trigger current to the third transistor, thereby energizing the first coil and controlling the switch module to close.

23. The safety leakage protection device according to claim 21, characterized in that: The isolation coupling module at least includes: an isolation coupling processing unit, a primary portion of which is coupled to the output terminal; A fourth transistor is coupled to the first driving control module and a secondary part of the isolation coupling processing unit respectively.

24. The safety leakage protection device according to claim 23, characterized in that: When the first driving control module controls the switch module to close and the load-end power supply is turned on, the fourth transistor of the isolation coupling module is turned on to control the first driving control module to stop working.

25. The safety leakage protection device according to claim 17, characterized in that: When the leakage detection module detects the leakage fault, a leakage fault signal related to the leakage fault is sent to the second drive control module to trigger the first transistor to turn on, so that the second coil is energized and the switch module is controlled to be disconnected.

26. The safety leakage protection device according to claim 23, characterized in that: The safety leakage protection device also includes: A reset module is respectively coupled to the first drive control module, the steady-current drive module and the isolation coupling module, and is used to control the fifth transistor and the fourth transistor to be cut off when the first drive control module stops working, so as to reset the first drive control module, the steady-current drive module and the isolation coupling module.

27. The safety leakage protection device according to any one of claims 17, 18, 19 and 25, characterized in that: The first transistor is any switch element among thyristor, triode and MOS tube.

28. The safety leakage protection device according to claim 18 or 19, characterized in that: The second transistor is any switch element among thyristor, triode and MOS tube.

29. The safety leakage protection device according to claim 20 or 22, characterized in that: The third transistor is any switch element among thyristor, triode and MOS tube.

30. The safety leakage protection device according to any one of claims 23, 24 and 26, characterized in that: The fourth transistor is any switch element among thyristor, triode and MOS tube.

31. The safety leakage protection device according to any one of claims 21, 22 and 26, characterized in that: The fifth transistor is any switch element among thyristor, triode and MOS tube.

32. The safety leakage protection device according to claim 23, characterized in that: The isolation coupling processing unit is any isolation coupling device among a photoelectric coupler, a relay and a transformer.

Images