Leakage protection device with reset control function

Abstract

The present invention discloses a leakage protection device with a reset control function, comprising a switch module, a power module, a leakage detection module, a self-test module, a drive control module, a first reset module and / or a second reset module. The drive control module is used to drive the switch module based on the received leakage fault signal and / or the fault signal and / or the tripping signal related to the leakage detection module; the first reset module of the leakage protection device with an automatic reset control function is used to keep the leakage protection device in an on state when the power is cut off and then on; the second reset module of the leakage protection device with a manual reset control function is used to keep the leakage protection device in an off state based on the tripping signal when the power is cut off and then on. The disclosed leakage protection device can make the leakage protection device in an on or off state as required when the power is on again after a power outage, so as to ensure that the relevant equipment can work normally and reduce the risks of these equipment caused by power outages.

Description

Technical Field

[0001] The invention relates to the field of household circuits, and in particular to a leakage protection device with a reset control function. Background Art

[0002] As people's awareness of electricity safety continues to improve, leakage protection devices are used more and more widely. Due to different equipment or environments, the requirements for the reset state of leakage protection devices after power is turned on are also different. For example, leakage protection devices used in refrigerators and freezers are expected to be directly in the on state when power is restored after a power outage to ensure that the equipment can work normally, thereby reducing the risk of items in the refrigerator and freezer rotting; while for some power tools, such as cutting machines and power tools, it is expected that the leakage protection device is in the off state when power is restored after a power outage, and it needs to be manually reset before the power is turned on to ensure safe use.

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

[0004] In view of the above problems, the present invention proposes a leakage protection device with a reset control function, thereby improving product safety.

[0005] In one aspect, the present invention provides a leakage protection device with a reset control function, which comprises:

[0006] 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;

[0007] A power supply module, coupled to the input terminal, for providing working power to the leakage protection device;

[0008] 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;

[0009] a self-checking module coupled to the input terminal and the leakage detection module, and configured to periodically generate a self-checking pulse signal simulating a leakage current signal to detect whether the leakage detection module fails;

[0010] a drive control module, coupled to the leakage detection module, the self-test module and the switch module, and configured to drive the switch module based on the received leakage fault signal and / or a fault signal related to the leakage detection module; and

[0011] The first reset module is coupled between the power module and the drive control module, and is used to keep the leakage protection device in the on state when the power is cut off and then on.

[0012] In one embodiment, the drive control module includes:

[0013] a relay coil, coupled to the first reset module, for controlling the switch module;

[0014] a drive control circuit, which is respectively coupled to the relay coil, the leakage detection module and the self-test module, and is used to control the relay coil based on the leakage fault signal and / or a fault signal related to the leakage detection module; and

[0015] A reset switch is coupled to the drive control circuit and is used to reset the drive control module after detecting the leakage fault signal and / or a fault signal related to the leakage detection module.

[0016] In one implementation, the first reset module includes:

[0017] A first capacitor coupled between the power module and ground;

[0018] A first voltage-dividing resistor coupled to the first capacitor;

[0019] A second voltage-dividing resistor coupled to the first voltage-dividing resistor; and

[0020] A first transistor, which is respectively coupled to the first voltage-dividing resistor, the second voltage-dividing resistor and the relay coil;

[0021] When the power is turned off and then on again, the power module charges the first capacitor, so that the voltage of the second voltage-dividing resistor triggers the first transistor to turn on, so as to energize the relay coil and control the switch module to close.

[0022] In one implementation, the first transistor is any semiconductor switch element among MOS tube, thyristor and / or triode.

[0023] On the other hand, the present invention also provides a leakage protection device with a reset control function, which comprises:

[0024] 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;

[0025] A power supply module, coupled to the input terminal, for providing working power to the leakage protection device;

[0026] 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;

[0027] a self-checking module coupled to the input terminal and the leakage detection module, and configured to periodically generate a self-checking pulse signal simulating a leakage current signal to detect whether the leakage detection module fails;

[0028] a drive control module, coupled to the leakage detection module, the self-test module and the switch module, and configured to drive the switch module based on one or more of a received leakage fault signal, a fault signal related to the leakage detection module, and a trip signal;

[0029] a second reset module, which is coupled to the input terminal and the drive control module respectively, and is used to keep the leakage protection device in a disconnected state based on the trip signal when power is turned off and then on; and

[0030] a first reset module, coupled between the power supply module and the drive control module, for controlling the drive control module to connect the power connection between the input end and the output end based on the reset operation of the drive control module in the absence of the leakage fault signal, the fault signal related to the leakage detection module, and the tripping signal.

[0031] In one embodiment, the drive control module includes:

[0032] a relay coil, coupled to the first reset module, for controlling the switch module;

[0033] a drive control circuit, which is respectively coupled to the relay coil, the leakage detection module, the self-test module and the second reset module, and is used to control the relay coil based on one or more of the leakage fault signal, the fault signal related to the leakage detection module and the trip signal from the second reset module; and

[0034] A reset switch is coupled to the drive control circuit and is used to reset the drive control module after detecting one or more of the leakage fault signal, the fault signal related to the leakage detection module, and the trip signal.

[0035] In one embodiment, the drive control circuit includes:

[0036] A first diode coupled between the first reset module and the leakage detection module;

[0037] a second transistor connected in parallel with the reset switch and respectively coupled to the leakage detection module, the self-test module and the second reset module; and

[0038] a third transistor connected in parallel with the reset switch and respectively coupled to the leakage detection module, the self-test module and the second reset module;

[0039] The second transistor and / or the third transistor controls the relay coil based on one or more of the received leakage fault signal, the fault signal related to the leakage detection module and the tripping signal.

[0040] In one implementation, the second reset module includes:

[0041] A third voltage-dividing resistor coupled to the input terminal;

[0042] a fourth voltage-dividing resistor, coupled to the input terminal;

[0043] a second diode, which is respectively coupled between the fourth voltage-dividing resistor and the driving control circuit;

[0044] A second capacitor coupled between the third voltage-dividing resistor and ground; and

[0045] a fourth transistor, coupled to the second capacitor, the fourth voltage-dividing resistor and the ground respectively;

[0046] When the power is turned off and then on, the trip signal is generated via the input end, the fourth voltage-dividing resistor and the second diode to trigger the drive control circuit, so that the relay coil stops working and controls the switch module to remain in an off state.

[0047] In one embodiment, the second reset module is further configured to: when power is turned off and then on, when the voltage via the input terminal reaches a preset value and the voltage of the second capacitor is increased to turn on the fourth transistor, the input terminal, the fourth voltage-dividing resistor and the second diode stop generating the trip signal.

[0048] In one embodiment, the second reset module is further used for: when power is cut off and then on again, when the voltage via the input terminal is lower than the preset value, the fourth transistor is cut off, the fourth voltage-dividing resistor and the second diode generate the trip signal, triggering the drive control circuit to stop the relay coil from working and control the switch module to remain in the off state.

[0049] In one implementation, the first reset module includes:

[0050] A first capacitor coupled between the power module and ground;

[0051] A first voltage-dividing resistor coupled to the first capacitor;

[0052] A second voltage-dividing resistor coupled to the first voltage-dividing resistor; and

[0053] A first transistor, which is respectively coupled to the first voltage-dividing resistor, the second voltage-dividing resistor and the relay coil;

[0054] In which, in the absence of the leakage fault signal, the fault signal related to the leakage detection module and the tripping signal, based on the reset operation of the drive control module, the power supply module charges the first capacitor so that the voltage of the second voltage-dividing resistor provides a signal to the drive control module to control the drive control module to connect the power connection between the input end and the output end.

[0055] In one implementation, the second transistor or the third transistor is any semiconductor switch element among MOS transistors, thyristors and / or triodes.

[0056] In one implementation, the fourth transistor is any semiconductor switch element among MOS tube, thyristor and / or triode.

[0057] Compared with the prior art, the present invention discloses a leakage protection device with an automatic reset control function and a leakage protection device with a manual reset control function, so as to meet different requirements for product reset in different use equipment or environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] 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.

[0059] Figure 1 shows a schematic diagram of a circuit structure according to a first embodiment of the present invention; and

[0060] Figure 2 FIG. 4 is a schematic diagram showing a circuit structure according to a second embodiment of the present invention. DETAILED DESCRIPTION

[0061] 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.

[0062] 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.

[0063] The embodiments of the present disclosure mainly focus on the following technical problem: how to meet different requirements of different devices or apparatuses for product resetting.

[0064] In order to solve the above problems, the leakage protection device with reset control function disclosed in this article includes: a switch module, a power module, a leakage detection module, a self-test module, a drive control module and a first reset module. The switch module is used to control the power connection between the input end and the output end; the leakage detection module is used to detect whether there is a leakage fault signal at the output end of the main line; the self-test module is used to periodically generate a self-test pulse signal simulating a leakage current signal to detect whether the leakage detection module fails; the drive control module is used to drive the switch module based on the received leakage fault signal and / or the fault signal related to the leakage detection module; the first reset module is used to keep the leakage protection device in the on state when the power is turned off and then on.

[0065] Example 1

[0066] like Figure 1 As shown, the leakage protection device with automatic reset control function disclosed in this embodiment includes: a switch module SW, a power module 1, a leakage detection module 2, a self-test module 3, a drive control module 4 and a first reset module 5. The switch module SW is coupled between the input end LINE and the output end LOAD of the trunk line, and is used to control the power connection between the input end LINE and the output end LOAD. The power module 1 is coupled to the input end LINE, and is used to provide working power to the leakage protection device. The leakage detection module 2 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 3 is coupled to the input end LINE and the leakage detection module 2, and is used to periodically generate a self-test pulse signal simulating a leakage current signal to detect whether the leakage detection module 2 fails. The drive control module 4 is coupled to the leakage detection module 2, the self-test module 3 and the switch module SW, and is used to drive the switch module SW based on the received leakage fault signal and / or the fault signal related to the leakage detection module 2. The first reset module 5 is coupled between the power module 1 and the drive control module 4 and is used to keep the leakage protection device in the on state when the input terminal LINE is powered off and then powered on.

[0067] like Figure 1As shown, the drive control module 4 includes: a relay coil RELAY, a reset switch RESET and a drive control circuit. The relay coil RELAY is coupled to the first reset module 5 for controlling the switch module SW; the drive control circuit is respectively coupled to the relay coil RELAY, the leakage detection module 2 and the self-test module 3 for controlling the relay coil RELAY based on the received leakage fault signal and / or the fault signal related to the leakage detection module; the reset switch RESET is coupled to the drive control circuit for resetting the drive control module 4 after detecting the leakage fault signal and / or the fault signal related to the leakage detection module.

[0068] like Figure 1 As shown, the first reset module 5 includes: a first capacitor C13, a first voltage-dividing resistor R18, a second voltage-dividing resistor R19 and a first transistor Q4. In this embodiment, the first capacitor C13 is coupled between the power module 1 and the ground; the first voltage-dividing resistor R18 and the second voltage-dividing resistor R19 are coupled in series, and the first capacitor C13 is coupled in parallel; the control electrode of the first transistor Q4 is coupled between the first voltage-dividing resistor R18 and the second voltage-dividing resistor R19, and the first transistor Q4 is coupled in series with the relay coil RELAY.

[0069] In this embodiment, when the input terminal LINE is powered on, the power module 1 charges the first capacitor C13, so that the voltage of the second voltage-dividing resistor R19 triggers the first transistor Q4 to turn on, so as to energize the relay coil RELAY and control the switch module SW to close.

[0070] In this embodiment, the first transistor Q4 may be any semiconductor switch element among MOS tube, thyristor and / or triode.

[0071] like Figure 1 As shown, the leakage detection module 2 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 and the neutral line detection ring CT2 (which includes a leakage detection chip U1 and related coupled electronic components (e.g., capacitor C4, 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 fault signal, a corresponding voltage signal will be generated on the leakage detection ring CT1, and the leakage detection chip U1 will control the transistor Q1 and / or Q01 to turn on by detecting that the leakage fault signal on the leakage detection ring CT1 exceeds a preset value, thereby driving the relay coil RELAY to disconnect the switch module SW.

[0072] In this embodiment, the self-test module 3 is used to perform periodic functional checks on the leakage detection module 2. The self-test module 3 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 R5, a voltage regulator ZD1, and a capacitor C9; the periodic timing circuit includes a resistor R9 and a timing element (e.g., a capacitor C10) connected in series to generate an interval of a self-test pulse signal; the self-test pulse signal circuit includes a transistor Q2, a processor U2, a capacitor C11, a resistor R10, and electronic components such as resistors R13 and R11 respectively coupled to the transistor Q2. After the leakage detection device works, the self-test module 3 periodically applies a simulated leakage fault signal reaching a predetermined value to the leakage detection loop CT1 to detect whether a fault occurs in the leakage detection module 2.

[0073] In addition, in this embodiment, the processor U2 in the self-test module 3 is coupled to the transistor Q1 and / or Q01 through the diode D3, and is used to drive the transistor Q1 and / or Q01 to turn on based on the received fault signal related to the leakage detection module 2, so as to control the relay coil RELAY to disconnect the switch module SW.

[0074] Specifically, the drive control circuit at least includes: a first diode D7, a second transistor Q01 and a third transistor Q1. The first diode D7 is coupled between the first reset module 5 and the leakage detection module 2; the second transistor Q01 is connected in parallel with the reset switch RESET, and is respectively coupled to the leakage detection module 2 and the self-test module 3; the third transistor Q1 is connected in parallel with the reset switch RESET, and is respectively coupled to the leakage detection module 2 and the self-test module 3.

[0075] The working principle of this embodiment is as follows:

[0076] When the leakage protection device disclosed in the present embodiment is powered off and then powered on, that is, when the input terminal LINE is powered on again, the resistor R20, the capacitor C12, and the rectifier bridge DB in the power module 1 generate a constant current to charge the first capacitor C13 of the first reset module 5. When the voltage at the upper end of the first capacitor C13 continues to rise, and the voltage of the second voltage-dividing resistor R19 gradually rises to a level that can trigger the first transistor Q4 to turn on, the first transistor Q4 is triggered to turn on, so that the relay coil RELAY and the first transistor Q4 form a current loop, and then the relay coil RELAY works to pull in, and the switch module SW is closed, and the load power is turned on, that is, the product is automatically reset when it is powered on.

[0077] When the drive control module 4 receives a leakage fault signal and / or a fault signal related to the leakage detection module, the transistor Q1 and / or Q01 is turned on, so that the relay coil RELAY stops working, and the switch module SW disconnects the load power supply. Next, when the leakage fault signal is received and / or the fault signal related to the leakage detection module 2 is eliminated, the reset switch RESET is pressed, and the transistor Q1 and / or Q01 is cut off, so that the first reset module 5 works normally and controls the relay coil RELAY to work and close. If the leakage fault signal is received and / or the fault signal related to the leakage detection module is not eliminated, the transistor Q1 and / or Q01 will continue to be turned on, and the relay coil RELAY will not work and close, so that the load power supply cannot be connected. In this embodiment, the transistor Q1 and / or Q01 preferably adopts a thyristor.

[0078] The leakage protection device with automatic reset control function disclosed in this embodiment can be applied to certain devices that expect the leakage protection device to be in the on state when the power is cut off and then on to ensure the normal operation of the device. The leakage protection device with automatic reset control function disclosed can use the first reset module to automatically turn on the power of the leakage protection device when the power is cut off and then on, meeting the demand of some devices to automatically turn on the power.

[0079] Example 2

[0080] Figure 2 An embodiment of a leakage protection device with a manual reset control function is disclosed. In this embodiment, the leakage protection device includes: a switch module SW, a power module 1, a leakage detection module 2, a self-test module 3, a drive control module 4, a first reset module 5, and a second reset module 6. The structures and functions of the switch module SW, the power module 1, the leakage detection module 2, and the self-test module 3 are the same as those of the corresponding modules in Embodiment 1, and are not described in detail here.

[0081] In this embodiment, the drive control module 4 is coupled to the leakage detection module 2, the self-test module 3 and the switch module SW, and is used to drive the switch module SW based on one or more of the received leakage fault signal, the fault signal related to the leakage detection module 2, and the trip signal. The first reset module 5 is coupled between the power module 1 and the drive control module 4, and is used to control the drive control module 4 to connect the power connection between the input terminal LINE and the output terminal LOAD based on the reset operation of the drive control module 4 when there is no leakage fault signal, the fault signal related to the leakage detection module, and the trip signal. The second reset module 6 is coupled to the input terminal LINE and the drive control module 4, respectively, and is used to keep the leakage protection device in a disconnected state based on the trip signal when the power is turned on.

[0082] In addition, if Figure 2As shown, the drive control module 4 includes: a relay coil RELAY, a reset switch RESET and a drive control circuit. The relay coil RELAY is coupled to the first reset module 5 for controlling the switch module SW; the drive control circuit is respectively coupled to the relay coil RELAY, the leakage detection module 2, the self-test module 3 and the second reset module 6, for controlling the relay coil RELAY based on one or more of the leakage fault signal, the fault signal related to the leakage detection module 2 and the tripping signal from the second reset module 6; the reset switch RESET is coupled to the drive control circuit for resetting the drive control module 4 (i.e., making the transistors Q1 and Q01 in the cut-off state) after the leakage fault signal and / or the fault signal and / or the tripping signal related to the leakage detection module 2 are detected and tripped.

[0083] Specifically, the drive control circuit at least includes: a first diode D7, a second transistor Q01 and a third transistor Q1. The first diode D7 is coupled between the first reset module 5 and the leakage detection module 4; the second transistor Q01 is connected in parallel with the reset switch RESET, and is respectively coupled to the leakage detection module 2, the self-test module 3 and the second reset module 6; the third transistor Q1 is connected in parallel with the reset switch RESET, and is respectively coupled to the leakage detection module 2, the self-test module 3 and the second reset module 6. In this embodiment, the second transistor Q01 and / or the third transistor Q1 controls the relay coil RELAY based on one or more of the received leakage fault signal, the fault signal related to the leakage detection module 2 and the tripping signal.

[0084] like Figure 2 As shown, the first reset module 5 includes: a first capacitor C13, a first voltage-dividing resistor R18, a second voltage-dividing resistor R19 and a first transistor Q4. In this embodiment, the first capacitor C13 is coupled between the power module 1 and the ground; the first voltage-dividing resistor R18 is coupled in series with the second voltage-dividing resistor R19, and the first capacitor C13 is coupled in parallel; the control electrode of the first transistor Q4 is coupled between the first voltage-dividing resistor R18 and the second voltage-dividing resistor R19, and the first transistor Q4 is coupled in series with the relay coil RELAY. When the power is turned on, when there is no leakage fault signal, a fault signal related to the leakage detection module 2, and a tripping signal, based on the reset operation of the drive control module 4, the power module 1 charges the first capacitor C13 of the first reset module 5, so that the voltage of the second voltage-dividing resistor R19 triggers the first transistor Q4 to turn on, so that the relay coil RELAY works and is attracted, and the drive switch module SW connects the power connection between the input terminal LINE and the output terminal LOAD.

[0085] In addition, in this embodiment, Figure 2As shown, the second reset module 6 includes: a third voltage-dividing resistor R16 and a fourth voltage-dividing resistor R25 coupled to the input terminal, a second diode D10, a second capacitor C8, a fourth transistor Q5, and a fifth voltage-dividing resistor R17. The second diode D10 is respectively coupled between the fourth voltage-dividing resistor R25 and the drive control circuit (specifically, the second transistor Q01 and the third transistor Q1); the third voltage-dividing resistor R16 and the fifth voltage-dividing resistor R17 are connected in series, the second capacitor C8 is coupled between the third voltage-dividing resistor R16 and the ground, and the second capacitor C8 and the fifth voltage-dividing resistor R17 are connected in parallel; and the fourth transistor Q5 is respectively coupled to the second capacitor C8, the fourth voltage-dividing resistor R25, and the ground. In this embodiment, when the power is turned off and then on again, a trip signal is generated via the input end, the fourth voltage-dividing resistor R25, and the second diode D10, triggering the second transistor Q01 and / or the third transistor Q1 to turn on, so that the power module 1, the first diode D7, the second transistor Q01, and / or the third transistor Q1 form a loop, so that the relay coil RELAY stops working and controls the switch module SW to remain in the disconnected state.

[0086] In this embodiment, the second reset module 6 is further used for: when the power is turned off and then on, when the voltage of the input terminal LINE meets a preset value (for example, the voltage of the input terminal LINE is ≥90V), the input terminal LINE is divided by the third voltage-dividing resistor R16 and the fifth voltage-dividing resistor R17 to charge the second capacitor C8 and increase the voltage of the second capacitor C8 to the point where the fourth transistor Q5 is turned on, so that the fourth voltage-dividing resistor R25 and the second diode D10 stop generating a trip signal.

[0087] In addition, the second reset module 6 is further used for: when the power is turned off and then on again, when the voltage of the input terminal LINE is lower than a preset value (for example, the voltage of the input terminal LINE is less than 90V), the voltage of the second capacitor C8 cannot be increased to a potential that triggers the fourth transistor Q5 to turn on by dividing the voltage through the third voltage-dividing resistor R16 and the fifth voltage-dividing resistor R17 via the input terminal, then the fourth transistor remains cut off, the fourth voltage-dividing resistor R25 and the second diode D10 continue to generate a trip signal, triggering the drive control circuit (specifically, the second transistor Q1 and / or the third transistor Q01), so that the relay coil RELAY stops working and controls the switch module SW to remain in an off state.

[0088] In this embodiment, any one of the second transistor Q01, the third transistor Q1 and the fourth transistor Q5 is any semiconductor switch element such as a MOS transistor, a thyristor and / or a triode.

[0089] The working principle of this embodiment is as follows:

[0090] When the input terminal LINE is connected to power, a trip signal is generated by the input terminal LINE, the fourth voltage-dividing resistor R25 and the second diode D10, triggering the second transistor Q1 and / or the third transistor Q01 to turn on and keep it on, then the power module 1, the first diode D7, the second transistor Q1 and / or the third transistor Q01 form a loop, so that the relay coil RELAY stops working and cannot be attracted, and the switch module SW is disconnected.

[0091] At the same time, if the voltage of the input terminal LINE meets the preset value (for example, the voltage of the input terminal LINE is ≥90V), the input terminal LINE will be divided by the third voltage-dividing resistor R16 and the fifth voltage-dividing resistor R17 to charge the second capacitor C8 and increase the voltage of the second capacitor C8 to turn on the fourth transistor Q5, and the input terminal LINE, the fourth voltage-dividing resistor R25 and the second diode D10 stop generating a tripping signal that continuously triggers the second transistor Q1 and / or the third transistor Q01 to turn on. At this time, the reset switch RESET is manually pressed to turn off the turned-on second transistor Q1 and / or the third transistor Q01, and the resistor R20, the capacitor C12 and the rectifier bridge DB in the power module 1 generate a constant current to charge the first capacitor C13. When the voltage of the first capacitor C13 continues to rise, the voltage of the second voltage-dividing resistor R19 can trigger the first transistor Q4 to turn on, so that the relay coil RELAY and the first transistor Q4 form a current loop, and then the relay coil RELAY works to attract, and the switch module SW is closed, and the load power supply is turned on, that is, the product is manually reset.

[0092] In addition, if the voltage of the input terminal LINE does not meet the preset value (for example, the voltage of the input terminal LINE is less than 90V), due to the low voltage, the voltage of the second capacitor C8 will be charged by the third voltage-dividing resistor R16 and the fifth voltage-dividing resistor R17 through the input terminal LINE, and the voltage of the second capacitor C8 cannot be increased to turn on the fourth transistor Q5. The input terminal LINE, the fourth voltage-dividing resistor R25 and the second diode D10 will continue to generate a trip signal to trigger the second transistor Q1 and / or the third transistor Q01 to turn on, so that the relay coil RELAY stops working, and the switch module SW is controlled to remain in the off state to achieve low voltage protection.

[0093] The leakage protection device with manual reset control function disclosed in this embodiment can be applied to certain devices that are expected to be in a disconnected state when the power is turned off and then on, and need to be manually reset before they can work normally. The leakage protection device with manual reset control function disclosed can use the second reset module to disconnect the power of the leakage protection device when the power is turned off and then on, meeting the need of some devices to manually connect the power to ensure power safety.

[0094] 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 leakage protection device with reset control function, 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 power supply module, coupled to the input terminal, for providing working power to the leakage protection device; 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-checking module coupled to the input terminal and the leakage detection module, and configured to periodically generate a self-checking pulse signal simulating a leakage current signal to detect whether the leakage detection module fails; a drive control module, coupled to the leakage detection module, the self-test module and the switch module, and configured to drive the switch module based on the received leakage fault signal and / or the fault signal related to the leakage detection module, wherein the drive control module comprises a relay coil, and the relay coil is coupled to a first reset module and configured to control the switch module; and A first reset module is coupled between the power module and the drive control module and is used to keep the leakage protection device in an on state when power is turned off and then on. Wherein, the first reset module includes: A first capacitor coupled between the power module and ground; A first resistor coupled to the first capacitor; and A first transistor is coupled to the first resistor and the relay coil.

2. The leakage protection device according to claim 1, characterized in that: The drive control module also includes: a drive control circuit, which is respectively coupled to the relay coil, the leakage detection module and the self-test module, and is used to control the relay coil based on the leakage fault signal and / or a fault signal related to the leakage detection module; and A reset switch is coupled to the drive control circuit and is used to reset the drive control module after detecting the leakage fault signal and / or a fault signal related to the leakage detection module.

3. The leakage protection device according to claim 2, characterized in that: The first resistor is a first voltage-dividing resistor, and the first reset module further includes: a second voltage-dividing resistor coupled to the first voltage-dividing resistor and the first transistor, The control electrode of the first transistor is coupled to the first voltage-dividing resistor, the anode of the first transistor is coupled to the relay coil, and the cathode of the first transistor is coupled to the negative electrode of the first capacitor. When the power is turned off and then on again, the power module charges the first capacitor, so that the voltage of the second voltage-dividing resistor triggers the first transistor to turn on, so as to energize the relay coil and control the switch module to close.

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

5. A leakage protection device with reset control function, 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 power supply module, coupled to the input terminal, for providing working power to the leakage protection device; 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-checking module coupled to the input terminal and the leakage detection module, and configured to periodically generate a self-checking pulse signal simulating a leakage current signal to detect whether the leakage detection module fails; a drive control module coupled to the leakage detection module, the self-test module and the switch module, and configured to drive the switch module based on one or more of a received leakage fault signal, a fault signal related to the leakage detection module and a trip signal; A second reset module, which is coupled to the input terminal and the drive control module respectively, and is used to keep the leakage protection device in a disconnected state based on the trip signal when power is turned off and then on; as well as a first reset module, coupled between the power supply module and the drive control module, for controlling the drive control module to connect the power connection between the input end and the output end based on the reset operation of the drive control module in the absence of the leakage fault signal, the fault signal related to the leakage detection module and the tripping signal.

6. The leakage protection device according to claim 5, characterized in that: The drive control module comprises: a relay coil, coupled to the first reset module, for controlling the switch module; a drive control circuit, which is respectively coupled to the relay coil, the leakage detection module, the self-test module and the second reset module, and is used to control the relay coil based on one or more of the leakage fault signal, the fault signal related to the leakage detection module and the trip signal from the second reset module; and A reset switch is coupled to the drive control circuit and is used to reset the drive control module after detecting one or more of the leakage fault signal, the fault signal related to the leakage detection module, and the trip signal.

7. The leakage protection device according to claim 6, characterized in that: The drive control circuit comprises: A first diode coupled between the first reset module and the leakage detection module; a second transistor connected in parallel with the reset switch and respectively coupled to the leakage detection module, the self-test module and the second reset module; and a third transistor connected in parallel with the reset switch and respectively coupled to the leakage detection module, the self-test module and the second reset module; The second transistor and / or the third transistor controls the relay coil based on one or more of the received leakage fault signal, the fault signal related to the leakage detection module and the tripping signal.

8. The leakage protection device according to claim 6, characterized in that: The second reset module includes: A third voltage-dividing resistor coupled to the input terminal; a fourth voltage-dividing resistor, coupled to the input terminal; a second diode, which is respectively coupled between the fourth voltage-dividing resistor and the driving control circuit; A second capacitor coupled between the third voltage-dividing resistor and ground; and a fourth transistor, coupled to the second capacitor, the fourth voltage-dividing resistor and the ground respectively; When the power is turned off and then on, the trip signal is generated via the input end, the fourth voltage-dividing resistor and the second diode to trigger the drive control circuit, so that the relay coil stops working and controls the switch module to remain in an off state.

9. The leakage protection device according to claim 8, characterized in that: The second reset module is further used for: when power is turned off and then on, when the voltage through the input terminal reaches a preset value and the voltage of the second capacitor is increased to make the fourth transistor conductive, the input terminal, the fourth voltage-dividing resistor and the second diode stop generating the trip signal.

10. The leakage protection device according to claim 9, characterized in that: The second reset module is further used for: when power is cut off and then on again, when the voltage via the input terminal is lower than the preset value, the fourth transistor is cut off, the fourth voltage-dividing resistor and the second diode generate the trip signal, triggering the drive control circuit to stop the relay coil from working and control the switch module to remain in an open state.

11. The leakage protection device according to claim 6, characterized in that: The first reset module includes: A first capacitor coupled between the power module and ground; A first voltage-dividing resistor coupled to the first capacitor; A second voltage-dividing resistor coupled to the first voltage-dividing resistor; and A first transistor, which is respectively coupled to the first voltage-dividing resistor, the second voltage-dividing resistor and the relay coil; In which, in the absence of the leakage fault signal, the fault signal related to the leakage detection module and the tripping signal, based on the reset operation of the drive control module, the power supply module charges the first capacitor so that the voltage of the second voltage-dividing resistor provides a signal to the drive control module to control the drive control module to connect the power connection between the input end and the output end.

12. The leakage protection device according to claim 7, characterized in that: The second transistor or the third transistor is any semiconductor switch element among MOS tube, thyristor and triode.

13. The leakage protection device according to claim 8 or 9, characterized in that: The fourth transistor is any semiconductor switch element among MOS tube, thyristor and triode.

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