Earth leakage protection device, electric connection equipment and electric appliance
By using components such as current limiting elements and electromagnetic coils in leakage protection devices, power consumption is reduced and detection functions are increased, and the problems of high power consumption and single detection functions of existing devices are solved, and diversified detection and self-test capabilities are achieved to meet the needs of the Environmental protection requirements.
Patent Information
- Application Number
- CN202420256867.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-02-02
- Publication Date
- 2025-01-10
- Estimated Expiration
- 2034-02-02
AI Technical Summary
The existing leakage protection devices have high power consumption, which is difficult to meet environmental protection requirements, and have a single detection function, which cannot meet the needs of users in many aspects.
Use current limiting components to reduce power consumption, and connect capacitors or resistors in series on the power supply line, combining solenoid coils and switching semiconductor devices to realize a variety of detection functions, including leakage current detection capabilities of AC characteristics and pulsating DC characteristics, and at the same time, add self-test modules Perform periodic self-testing.
It effectively reduces the power consumption of the leakage protection device, realizes diversified detection capabilities, meets environmental protection requirements, and promptly detects module failures, providing ultra-low power consumption and self-test functions.
Smart Images
Figure CN222339027U_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the electrical field, and in particular to a leakage protection device, an electrical connection device and an electrical appliance. Background Art
[0002] As people's environmental awareness and safety awareness increase, more and more household appliances have higher environmental protection requirements for power consumption when in standby or off state (for example, less than 0.5w, etc.), and many household appliances are equipped with leakage protection devices (such as leakage protection plugs), which poses a high challenge to the power consumption of leakage protection products. For example, the current leakage protection products on the market generally have high power consumption and single detection functions, which are difficult to meet environmental protection requirements. Utility Model Content
[0003] Based on the above problems, the present disclosure proposes a leakage protection device, which effectively reduces power consumption by using a current limiting element and provides multiple detection functions, thereby meeting environmental protection requirements and satisfying various needs of users.
[0004] In a first aspect of the present disclosure, a leakage protection device is provided, comprising: a switch module, configured to control the power connection between the input end and the output end of a power line; a leakage detection module, configured to detect the leakage current on the power line, and generate a leakage fault signal when the leakage current exceeds a set threshold; a power supply module, configured to supply power to the power supply end of the leakage detection module, wherein the power supply module at least comprises a first current limiting element, and the first current limiting element is coupled in series between the power line and the leakage detection module; a driving module, configured to drive the switch module to disconnect the power connection between the input end and the output end of the power line when receiving the leakage fault signal, wherein the driving module at least comprises a first electromagnetic coil and a first switch semiconductor device; wherein a first end of the first electromagnetic coil is coupled to the power line, a second end of the first electromagnetic coil is coupled to a first end of the first switch semiconductor device, a first end of the first current limiting element is coupled to the power line, and a second end of the first current limiting element is coupled to a first end of the first switch semiconductor device through at least one first diode and / or a second current limiting element.
[0005] In a preferred embodiment, the leakage protection device further includes: a self-test module coupled to the leakage detection module and the drive module, wherein the self-test module is configured to generate a self-test signal and generate a self-test fault signal when a fault occurs in the leakage detection module and / or the drive module.
[0006] In a preferred embodiment, when the leakage detection module fails and the driving module does not fail, the self-test module generates a self-test processing signal; the driving module drives the switch module to disconnect the power connection between the input end and the output end of the power line based on the received self-test processing signal.
[0007] In a preferred embodiment, when the input end of the power line loses power, the switch module maintains the original connection state.
[0008] In a preferred embodiment, the first current limiting element includes a resistor, a capacitor, an inductor, or a combination thereof.
[0009] In a preferred embodiment, the first diode is integrated into the power module.
[0010] The leakage protection device according to the aforementioned first aspect can effectively reduce the power consumption of the device, and in addition to having the leakage current detection capability of AC characteristics, it also has the leakage current detection capability of pulsating DC characteristics.
[0011] The second aspect of the present disclosure proposes a leakage protection device, comprising: a switch module, configured to control the power connection between the input end and the output end of a power line; a leakage detection module, configured to detect the leakage current on the power line, and generate a leakage fault signal when the leakage current exceeds a set threshold; a power supply module, configured to supply power to the power supply end of the leakage detection module, wherein the power supply module at least includes a first capacitor, and the first capacitor is coupled in series between the power line and the leakage detection module; a driving module, configured to drive the switch module to disconnect the power connection between the input end and the output end of the power line when receiving the leakage fault signal; a self-test module, coupled to the leakage detection module and the driving module, the self-test module being configured to generate a self-test signal, and generate a self-test fault signal when a fault occurs in the leakage detection module and / or the driving module.
[0012] In a preferred embodiment, when the leakage detection module fails and the driving module does not fail, the self-test module generates a self-test processing signal; the driving module drives the switch module to disconnect the power connection between the input end and the output end of the power line based on the received self-test processing signal.
[0013] In a preferred embodiment, when the input end of the power line loses power, the switch module maintains the original connection state.
[0014] The leakage protection device according to the aforementioned second aspect can effectively reduce the power consumption of the device and has a periodic self-detection function so as to timely detect faults in the leakage detection module and / or the driving module in the leakage protection device.
[0015] A third aspect of the present disclosure provides an electrical connection device, comprising: a housing; and a leakage protection device according to any one of the embodiments of the first aspect or the second aspect, wherein the leakage protection device is accommodated in the housing.
[0016] The fourth aspect of the present disclosure proposes an electrical appliance, comprising: a load device; and an electrical connection device, which is coupled between a power line and the load device and is used to supply power to the load device, wherein the electrical connection device comprises a leakage protection device according to any one of the embodiments of the first aspect or the second aspect. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] The embodiments are shown and explained with reference to the accompanying drawings. These drawings are used to illustrate 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. In addition, the connection between each box in the architecture diagram indicates that the two boxes are electrically coupled, and the absence of a connection between the two boxes does not mean that the two boxes are not coupled.
[0018] Figure 1 A structural block diagram of a leakage protection device according to an embodiment of the present disclosure is shown;
[0019] Figure 2 A structural block diagram of another leakage protection device according to an embodiment of the present disclosure is shown;
[0020] Figure 3 It shows that according to the present disclosure Figure 1 A first exemplary circuit of a residual current protection device;
[0021] Figure 4 It shows that according to the present disclosure Figure 1 A second exemplary circuit of a residual current protection device;
[0022] Figure 5 It shows that according to the present disclosure Figure 1 A third exemplary circuit of a residual current protection device;
[0023] Figure 6 It shows that according to the present disclosure Figure 2 A fourth exemplary circuit of a leakage protection device.
[0024] Figure 7 It shows that according to the present disclosure Figure 2 A fifth exemplary circuit of a residual current protection device. DETAILED DESCRIPTION
[0025] In the following specific description of the preferred embodiments, reference will be made to the attached drawings that 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 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 defined by the attached claims.
[0026] Before introducing the embodiments of the present disclosure, some terms involved in the present disclosure are first explained to facilitate a better understanding of the present disclosure.
[0027] The terms "connection", "coupling" or "coupling" and similar terms used in the present disclosure are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "A", "a group" or "an" and similar words do not indicate a quantity limitation, but indicate the presence of at least one.
[0028] The terms "include", "comprising" and similar terms used in this disclosure should be understood as open terms, that is, "include / include but not limited to", indicating that other content may also be included. The term "based on" means "based at least in part on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one other embodiment" and so on. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.
[0029] In the present disclosure, a transistor may refer to a transistor of any structure, such as a field effect transistor (FET), a bipolar junction transistor (BJT) or a thyristor. When the transistor is a field effect transistor, its control electrode refers to the gate of the field effect transistor, the first electrode may be the drain or source of the field effect transistor, and the corresponding second electrode may be the source or drain of the field effect transistor; when the transistor is a bipolar transistor, its control electrode refers to the base of the bipolar transistor, the first electrode may be the collector or emitter of the bipolar transistor, and the corresponding second electrode may be the emitter or collector of the bipolar transistor; when the transistor is a thyristor, its control electrode refers to the control electrode G of the thyristor, the first electrode is the anode, and the second electrode is the cathode. For example, a switching semiconductor device may include a transistor or a device with similar functions.
[0030] The present disclosure aims to provide a leakage protection device that can meet environmental protection requirements in terms of power consumption and can also provide diversified detection capabilities to meet user needs.
[0031] Figure 1 The figure shows a block diagram of the structure of the leakage protection device 100 according to the embodiment of the present disclosure.
[0032] like Figure 1As shown, the leakage protection device 100 includes an input terminal 101 and an output terminal 102 of a power line 110, a switch module 103, a leakage detection module 104, a power module 105, and a drive module 106. The switch module 103 is coupled between the input terminal 101 and the output terminal 102 to control the power connection therebetween. The power line (also called a current-carrying line or a power supply line) connects the input terminal 101 and the output terminal 102, for example, including a first current-carrying line L (HOT) for connecting to the live line of the power grid and a second current-carrying line N (WHITE) for connecting to the neutral line of the power grid. The output terminal 102 is coupled to a load (LOAD), such as an electrical appliance or a wiring board. When the load uses electricity, a current loop is formed between the first current-carrying line and the second current-carrying line. The leakage detection module 104 is coupled between the input terminal 101 and the output terminal 102, and is used to detect whether there is a fault leakage current on the power line, and generate a leakage fault signal when a fault leakage current is detected. The driving module 106 is coupled to the leakage detection module 104 and the switch module 103, and drives the switch module 103 to disconnect the power connection between the input terminal 101 and the output terminal 102 in response to the leakage fault signal from the leakage detection module 104. When the input terminal 101 of the power line 110 loses power, the switch module 103 maintains the original connection state. The power supply module 105 is coupled to the power line 110 and the leakage detection module 104, and supplies power to the power supply end of the leakage detection module 104. The power supply module 105 includes at least one current limiting element, which is coupled in series between the power line 110 and the leakage detection module 104 to reduce the overall working power consumption of the device 100. The power supply module 105 also feeds a signal to the driving module 106 to control the driving module 106 to drive the switch module 103 in a partial cycle or a full cycle, so as to have the leakage detection capability of both AC characteristics and pulsating DC characteristics.
[0033] The leakage protection device 100 may also include a self-test module 107, which is coupled to the leakage detection module 104 and the drive module 106. The self-test module 107 can generate a self-test signal (for example, simulating a situation where a leakage current occurs), and can generate a self-test fault signal when a fault occurs in the leakage detection module 104 and / or the drive module 106, so as to promptly detect the presence of a fault in the leakage protection device 100 and replace it.
[0034] Compared with the existing leakage protection devices (for example, the power consumption is generally around 0.3w), Figure 1 The leakage protection device 100 can effectively reduce the working power consumption (for example, having an ultra-low power consumption of less than or equal to 0.1W) to meet environmental protection requirements, and has the leakage detection capability of AC characteristics and pulsating DC characteristics. In addition, the leakage protection device 100 can also achieve ultra-low power consumption on the basis of providing a self-checking function.
[0035] Combine the following Figure 3-Figure 5 Various exemplary circuits of the residual current protection device 100 are described.
[0036] refer to Figure 3 , showing the Figure 1 The first exemplary circuit 300 of the leakage protection device 100. The circuit 300 includes a switch module 303, a leakage detection module 304, a power module 305, and a drive module 306, which modules may correspond to Figure 1 The corresponding modules of the device 100.
[0037] like Figure 3 As shown, the power line includes a first current-carrying line HOT and a second current-carrying line WHITE. The switch module 303 includes a reset switch RESET arranged between the input terminal 301 and the output terminal 302. When the circuit 300 operates normally, the switch module 303 remains in a closed state.
[0038] The leakage detection module 304 includes a leakage detection loop ZCT1, a leakage detection chip or processor U1, and resistors, capacitors, etc. used in combination with the above components. The leakage detection loop ZCT1 passes through the first current-carrying line HOT and the second current-carrying line WHITE to detect whether there is leakage current in the first current-carrying line HOT and the second current-carrying line WHITE, collect the leakage current and send it to the leakage detection chip U1, so that the leakage detection chip U1 compares the leakage current with a set threshold value, and sends a leakage current fault signal (for example, via pin 1 of the leakage detection chip U1) when the leakage current exceeds the set threshold value.
[0039] The power module 305 includes a full-wave rectifier DB, a capacitor C3, and resistors, capacitors, etc. used in combination with the above components. The capacitor C3 is coupled between the power line and the input (e.g., pin 1) of the rectifier DB, and the output (e.g., pin 4) of the rectifier DB is coupled to the power supply end (e.g., pin 3 of the leakage detection chip U1) of the leakage detection module 304 to supply power to the leakage detection module 304. Specifically, the first end of the capacitor C3 is coupled to the power line (e.g., the first current-carrying line HOT) (e.g., via the electromagnetic coil SOL), and the second end of the capacitor C3 is coupled to the input pin 1 of the rectifier DB. Figure 3 In the embodiment, capacitor C3 as the first current limiting element does not do work and does not generate active power consumption, thereby playing the role of current limiting and reducing power consumption.
[0040] The driving module 305 includes a first electromagnetic coil SOL and at least one switching semiconductor device. Figure 3In the embodiment, at least one switching semiconductor device is implemented as parallel switching semiconductor devices Q1 and Q2 (for example, transistors) to provide redundant driving capabilities. In other embodiments, the at least one switching semiconductor device can be implemented as more or fewer transistors. The first end of the electromagnetic coil SOL is coupled to the power line (for example, the first current-carrying line HOT), and the second end is coupled to the first end (or input end) of the at least one switching semiconductor device Q1, Q2, and the second end (or output end) of the switching semiconductor device Q1, Q2 is coupled to the ground. The electromagnetic coil SOL generates an electromagnetic force for driving the reset switch RESET. The control ends of the switching semiconductor devices Q1, Q2 are respectively coupled to the leakage detection module 304 (for example, pin 1 of the leakage detection chip U1). The first end of the at least one switching semiconductor device Q1, Q2 can also be connected to the ground through at least one first diode (for example, Figure 3 diode D2) and / or a second current limiting element (e.g., Figure 3 The resistor R9) is coupled to the second end of the capacitor C3 as the first current limiting element, so that the semiconductor devices Q1 and Q2 can be continuously turned on when they are triggered to turn on.
[0041] like Figure 3 As shown, when the circuit 300 works normally, the current passes through the power line HOT-electromagnetic coil SOL-capacitor C3-rectifier DB-R3 to provide working power for the leakage detection module 304.
[0042] When leakage current occurs in the current-carrying lines HOT and WHITE, the leakage detection ring ZCT1 detects the leakage current signal and transmits the signal to the leakage detection chip U1. After processing and comparison by the chip U1, if the detected leakage current is greater than the set threshold, the pin 1 of the chip U1 outputs a high level (leakage fault signal), otherwise it outputs a low level. The high level of the pin 1 of the leakage detection chip U1 is provided to the control end of at least one switching semiconductor device Q1 and Q2 of the driving module 306 via the switching semiconductor device D3 and the resistor R13, triggering the switching semiconductor device Q1 and / or Q2 to turn on, thereby causing a current change on the electromagnetic coil SOL, thereby generating an electromagnetic force, driving the reset switch RESET to disconnect the power connection between the input end 301 and the output end 302 of the power line.
[0043] More specifically, if the magnitude of the detected leakage current is greater than the set threshold, the leakage fault signal output by the pin 1 of the chip U1 triggers the switching semiconductor device Q1 and / or Q2 to turn on, wherein the current passes through the power line HOT-electromagnetic coil SOL-switching semiconductor device Q1 / Q2-rectifier DB-power line WHITE in one half cycle, and the current passes through the power line WHITE-rectifier DB-resistor R3-resistor R9-diode D2-switching semiconductor device Q1 / Q2-rectifier DB-capacitor C3-electromagnetic coil SOL-power line HOT in the other half cycle, so that the switching semiconductor device Q1 / Q2 can be continuously turned on until the magnetic field of the electromagnetic coil SOL drives the reset switch RESET to disconnect the power connection between the input terminal 301 and the output terminal 302 of the power line. Whether the power line HOT voltage is higher than the power line WHITE voltage or the power line HOT voltage is lower than the power line WHITE voltage, the circuit 300 has the tripping capability, so that it can simultaneously have the leakage current detection capability of pulsating DC characteristics and AC characteristics.
[0044] The circuit 300 further includes a self-test module 307 , which provides a self-test function to detect whether the functions of the leakage detection module 305 and the driving module 304 are intact.
[0045] like Figure 3 As shown, the self-test module 307 includes a switching semiconductor device Q3, a voltage regulator tube ZD1, a diode D4, a light-emitting diode LED1, a capacitor C8, and resistors and capacitors used in combination with the above components. The current charges the capacitor C8 through the power line HOT-diode D4-resistor R10. When the voltage at the upper end of the capacitor C8 exceeds the threshold voltage of the triggering voltage regulator tube ZD1, the voltage regulator tube ZD1 is triggered to turn on, and the current passes through the capacitor C6-resistor R5-leakage detection ring ZCT1, and an analog leakage current signal is generated in the leakage detection ring ZCT1 as a self-test signal. When the leakage detection ring ZCT1 detects the analog leakage current signal, the signal is transmitted to the leakage detection chip U1. If the chip U1 works normally, after processing and comparison by the chip U1, the pin 1 of the chip U1 sends a high level (leakage fault signal). The high level of the pin 1 of the leakage detection chip U1 is provided to the control end of the switch semiconductor device Q3 via the resistor R12, triggering the switch semiconductor device Q3 to turn on, and quickly releasing the residual current of the capacitor C8. During this period, the time is short, and the voltage rise across the capacitor C9 is low, which will not cause the switch semiconductor device Q1 / Q2 to turn on, so that the electromagnetic coil SOL will not drive the reset switch RESET to disconnect the power connection between the input end 301 and the output end 302 of the power line. In addition, since the voltage regulator ZD1 does not remain turned on for a long time, the light-emitting diode LED1 will not be lit.
[0046] When the leakage detection module 304 fails, the pin 1 of the leakage detection chip U1 does not send a high level (leakage fault signal), the switch semiconductor device Q3 is not turned on, the charge of the capacitor C8 will not be quickly released, the voltage regulator ZD1 remains turned on for a long time, and after the capacitor C6 is fully charged, the current flows through the light-emitting diode LED1, and the light-emitting diode LED1 will be lit (for example, flashing) as a self-test fault signal. At the same time, the current is provided to the capacitor C9 via the resistor R8 as a self-test processing signal, and the driving module 306 makes the voltage across the capacitor C9 rise to a level sufficient to trigger the switch semiconductor device Q1 / Q2 to turn on based on the self-test processing signal, so that the electromagnetic coil SOL is energized to generate a strong magnetic field, and the switch module RESET is driven to disconnect the power connection between the input terminal 301 and the output terminal 302 of the power line, so as to remind the user that the leakage detection module 304 fails and needs to be replaced in time. That is, when the leakage detection module 304 fails and the driving module 306 does not fail, the operation of the light-emitting diode LED1 being lit and achieving the tripping can be regarded as a self-test fault signal. In other examples, the self-test fault signal may be provided via an audible indication or other indications. Similarly, when the driver module 306 fails (e.g., the solenoid SOL fails to trip the reset switch RESET), the light-emitting diode LED1 being illuminated and not tripping may be considered as a self-test fault signal.
[0047] refer to Figure 4 , showing the Figure 1 The second exemplary circuit 400 of the leakage protection device 100. The circuit 400 includes a switch module 403, a leakage detection module 404, a power module 405, and a drive module 406. These modules may correspond to Figure 1 In addition, the circuit 400 further includes an input terminal 401 and an output terminal 402 of a power line, and a self-checking module 407.
[0048] Except for the power module 405, other modules of the circuit 400 have the same or similar circuits and functions as the corresponding modules of the circuit 300, and their working principles will not be described in detail. In the circuit 400, the power module 405 includes a half-wave rectifier bridge having diodes D5 and D6, a capacitor C3, and resistors, capacitors, etc. used in combination with the above components. The capacitor C3 is coupled between the power line and the input of the half-wave rectifier bridge (for example, between the diodes D5 and D6), and the output of the half-wave rectifier bridge (for example, the cathode of the diode D5) is coupled to the power supply end of the leakage detection module 404 (for example, pin 3 of the leakage detection chip U1) to supply power to the leakage detection module 404. Specifically, the first end of the capacitor C3 is coupled to the power line (for example, via the electromagnetic coil SOL) (for example, via the first current-carrying line HOT), and the second end of the capacitor C3 is coupled to the input of the half-wave rectifier bridge. In Figure 4In the example, capacitor C3 as the first current limiting element does not do work and does not generate active power consumption, thereby playing the role of current limiting and reducing power consumption. Figure 3 The first end of at least one switching semiconductor device Q1, Q2 can also be connected through at least one first diode (for example, Figure 3 diode D2) and / or a second current limiting element (e.g., Figure 3 The resistor R9) is coupled to the second end of the capacitor C3 serving as the first current limiting element.
[0049] Similar to Figure 3 When the leakage detection chip U1 detects the leakage current and outputs a high level (leakage fault signal), triggering the switch semiconductor device Q1 and / or Q2 to turn on, the current passes through the power line HOT-electromagnetic coil SOL-switching semiconductor device Q1 / Q2-power line WHITE in half of the cycle, and the current releases through the capacitor C4-resistor R9-diode D2-switching semiconductor device Q1 / Q2-power line WHITE in the other half of the cycle, so that the switch semiconductor device Q1 / Q2 can continue to conduct until the magnetic field of the electromagnetic coil SOL drives the reset switch RESET to disconnect the power connection between the input terminal 401 and the output terminal 402 of the power line. Whether the power line HOT voltage is higher than the power line WHITE voltage or the power line HOT voltage is lower than the power line WHITE voltage, the circuit 400 has the tripping capability, so that it can simultaneously have the leakage current detection capability of pulsating DC characteristics and AC characteristics.
[0050] refer to Figure 5 , showing the Figure 1 The third exemplary circuit diagram 500 of the leakage protection device 100 is shown in FIG. The circuit 500 includes a switch module 503, a leakage detection module 504, a power module 505, and a drive module 506. These modules may correspond to Figure 1 In addition, the circuit 500 further includes an input terminal 501 and an output terminal 502 of a power line, and a self-checking module 507.
[0051] Except for the power module 405 , other modules of the circuit 400 have the same or similar circuits and functions as the corresponding modules of the circuit 300 , and their working principles will not be described in detail. Figure 4 The power module 405 is similar to Figure 3 The power module 305 is a power module 305, except that the capacitor C3 is replaced by a resistor R15 as a first current limiting element, and the first end of the resistor R15 is directly coupled to the power line, and the second end of the resistor R15 is coupled to the input (e.g., pin 1) of the rectifier DB. For example, the resistor R15 has a higher resistance value to reduce the overall operating power consumption of the circuit 400.
[0052] It should be understood that, although the above circuits 300-500 show the use of a capacitor or a resistor as the first current limiting element, the first current limiting element includes but is not limited to a resistor, a capacitor, an inductor, or various combinations thereof. In addition, although the above circuits 300-500 show the first diode and / or the second current limiting element outside the power module, the first diode and / or the second current limiting element can be integrated into the power module. For example, the first diode can be integrated into the rectifier.
[0053] refer to Figure 2 , shows an architectural block diagram of another leakage protection device 200 according to an embodiment of the present disclosure.
[0054] like Figure 2 As shown, the leakage protection device 200 includes an input terminal 201 and an output terminal 202 of a power line 210, a switch module 203, a leakage detection module 204, a power module 205, a drive module 206, and a self-test module 207. The switch module 203 is coupled between the input terminal 201 and the output terminal 202 to control the power connection therebetween, and the power line (also called a current-carrying line or a power supply line) connects the input terminal 201 and the output terminal 202. The output terminal 202 is coupled to a load (LOAD), such as an electrical appliance or a wiring board. When the load uses electricity, a current loop is formed between the first current-carrying line and the second current-carrying line. The leakage detection module 204 is coupled between the input terminal 201 and the output terminal 202, and is used to detect whether there is a fault leakage current on the power line, and generate a leakage fault signal when a fault leakage current is detected. The driving module 206 is coupled to the leakage detection module 204 and the switch module 203, and drives the switch module 203 to disconnect the power connection between the input terminal 201 and the output terminal 202 in response to the leakage fault signal from the leakage detection module 204. When the input terminal 201 of the power line 210 loses power, the switch module 203 maintains the original connection state. The power module 205 is configured to supply power to the power supply end of the leakage detection module 204. The power module 205 includes at least one capacitor, which is coupled in series between the power line 210 and the leakage detection module 204 to reduce the overall working power consumption of the device 200. The self-test module 207 is coupled to the leakage detection module 204 and the driving module 206. The self-test module 207 can generate a self-test signal (for example, simulating the situation of leakage current), and can generate a self-test fault signal when the leakage detection module 204 and / or the driving module 206 fail, so as to timely find out that there is a fault in the leakage protection device 200 and replace it.
[0055] Different from the leakage protection device 100, the power module 205 of the leakage protection device 200 does not feed a signal to the drive module 206, so that when a leakage fault with a pulsating DC characteristic occurs, the drive module 206 cannot drive the switch module 203 in a full cycle, and the leakage protection device 200 thus has the leakage detection capability of the AC characteristic but does not have the leakage detection capability of the pulsating DC characteristic. In other words, except that there is no control between the power module 205 and the drive module 206, the modules of the leakage protection device 200 and the corresponding modules of the leakage protection device 100 have the same or similar functions.
[0056] Compared with the existing leakage protection devices (for example, the power consumption is generally around 0.3w), Figure 2 The leakage protection device 200 can effectively reduce the working power consumption (for example, having an ultra-low power consumption less than or equal to 0.1w) to meet environmental protection requirements, has AC characteristic leakage detection capability, and provides a self-detection function to detect whether the functions of the leakage detection module and the driving module are intact.
[0057] Combine the following Figure 6 and Figure 7 Various exemplary circuits of the leakage protection device 200 are described.
[0058] refer to Figure 6 , showing the Figure 2 The fourth exemplary circuit 600 of the leakage protection device 200. The circuit 600 includes a switch module 603, a leakage detection module 604, a power module 605, a drive module 606, and a self-test module 607, which modules may correspond to Figure 2 In addition, the circuit 600 further includes an input terminal 601 and an output terminal 602 of a power line.
[0059] Circuit 600 is similar to circuit 300 for the most part, and the working principle of similar modules will not be described in detail, except that the first diode D2 and the second current limiting element R9 are eliminated in circuit 600. When a leakage current fault is detected, if the power line HOT voltage is lower than the power line WHITE, the switching semiconductor device Q1 / Q2 does not have the ability to maintain conduction (as described above in conjunction with circuits 300-500), and only has the tripping capability when the power line HOT voltage is higher than the power line WHITE. Therefore, it only has the leakage current detection capability of AC characteristics but not the leakage current detection capability of pulsating DC characteristics.
[0060] refer to Figure 7 , showing the Figure 2The fifth exemplary circuit 700 of the leakage protection device 200. The circuit 700 includes a switch module 703, a leakage detection module 704, a power module 705, a drive module 706, and a self-test module 707, which modules may correspond to Figure 2 In addition, the circuit 700 further includes an input terminal 701 and an output terminal 702 of a power line.
[0061] Circuit 700 is similar to circuit 400 in most aspects, and the working principles of similar modules are not described in detail, except that the first diode D2 and the second current limiting element R9 are eliminated in circuit 700. When a leakage current fault is detected, if the power line HOT voltage is lower than the power line WHITE, the switching semiconductor device Q1 / Q2 does not have the ability to maintain conduction (as described above in conjunction with circuits 300-500), and only has the tripping capability when the power line HOT voltage is higher than the power line WHITE. Therefore, it only has the leakage current detection capability of AC characteristics but not the leakage current detection capability of pulsating DC characteristics.
[0062] The present disclosure also proposes an electrical connection device, comprising: a housing; and a leakage protection device according to any one of the above embodiments, wherein the leakage protection device is accommodated in the housing.
[0063] The present disclosure also proposes an electrical appliance, including: a load device; an electrical connection device, which is coupled between a power line and the load device and is used to supply power to the load device, and the electrical connection device includes a leakage protection device according to any one of the above embodiments.
[0064] 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 protection of the present invention.
Claims
1. A leakage protection device, characterized in that: The leakage protection device comprises: a switch module configured to control the power connection between the input end and the output end of the power line; A leakage detection module is configured to detect leakage current on the power line and generate a leakage fault signal when the leakage current exceeds a set threshold; A power supply module, configured to supply power to a power supply terminal of the leakage detection module, wherein the power supply module at least comprises a first current limiting element, and the first current limiting element is coupled in series between the power line and the leakage detection module; a driving module, configured to drive the switch module to disconnect the power connection between the input end and the output end of the power line when receiving the leakage fault signal, wherein the driving module at least includes a first electromagnetic coil and a first switch semiconductor device; Among them, the first end of the first electromagnetic coil is coupled to the power line, the second end of the first electromagnetic coil is coupled to the first end of the first switching semiconductor device, the first end of the first current limiting element is coupled to the power line, and the second end of the first current limiting element is coupled to the first end of the first switching semiconductor device through at least one first diode and / or a second current limiting element.
2. The leakage protection device according to claim 1, characterized in that: Also includes: The self-test module is coupled to the leakage detection module and the driving module, and is configured to generate a self-test signal and a self-test fault signal when a fault occurs in the leakage detection module and / or the driving module.
3. The leakage protection device according to claim 2, characterized in that: When the leakage detection module fails and the driving module does not fail, the self-check module generates a self-check processing signal; The driving module drives the switch module to disconnect the power connection between the input end and the output end of the power line based on the received self-test processing signal.
4. The leakage protection device according to claim 1, characterized in that: When the input end of the power line loses power, the switch module maintains the original connection state.
5. The leakage protection device according to claim 1, characterized in that: The first current limiting element includes a resistor, a capacitor, an inductor, or a combination thereof.
6. The leakage protection device according to claim 1, characterized in that: The first diode is integrated into the power module.
7. A leakage protection device, characterized in that: The leakage protection device comprises: a switch module configured to control the power connection between the input end and the output end of the power line; A leakage detection module is configured to detect leakage current on the power line and generate a leakage fault signal when the leakage current exceeds a set threshold; A power supply module, configured to supply power to a power supply terminal of the leakage detection module, wherein the power supply module at least comprises a first capacitor, and the first capacitor is coupled in series between the power line and the leakage detection module; a driving module, configured to drive the switch module to disconnect the power connection between the input end and the output end of the power line when receiving the leakage fault signal; The self-test module is coupled to the leakage detection module and the driving module, and is configured to generate a self-test signal and a self-test fault signal when a fault occurs in the leakage detection module and / or the driving module.
8. The leakage protection device according to claim 7, characterized in that: When the leakage detection module fails and the driving module does not fail, the self-check module generates a self-check processing signal; The driving module drives the switch module to disconnect the power connection between the input end and the output end of the power line based on the received self-test processing signal.
9. The leakage protection device according to claim 7, characterized in that: When the input end of the power line loses power, the switch module maintains the original connection state.
10. An electrical connection device, characterized in that: The electrical connection device comprises: a housing; and The leakage protection device according to any one of claims 1 to 6 or the leakage protection device according to any one of claims 7 to 9, wherein the leakage protection device is accommodated in the housing.
11. An electrical appliance, characterized in that: The electrical appliances include: Load equipment; An electrical connection device, coupled between a power line and the load device, for supplying power to the load device, wherein the electrical connection device comprises a leakage protection device according to any one of claims 1 to 6 or a leakage protection device according to any one of claims 7 to 9.