Ground fault protection device, electric connection equipment and electric appliance
By setting up independent leakage protection and timing function driving circuits for ground fault protection devices, the problem that leakage protection function is affected by timing function in the prior art is solved, which improves safety and reduces cost and volume.
Patent Information
- Application Number
- CN202411388037.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-30
- Publication Date
- 2025-01-10
AI Technical Summary
The leakage protection function and timing function of the existing ground fault protection device share the switch and switch drive circuit, which may affect the leakage protection function when the timing circuit is damaged or program errors, increasing safety risks, and independent control of the timing function requires large and expensive power relays. , resulting in increased device volume and increased cost.
A ground fault protection device is designed, in which the leakage protection function and timing function set independent driving circuits and control the power connection through the same switch, and the independent coil and semiconductor components are used to realize the independence of the driving circuit, eliminating potential safety. Hidden dangers and reduce costs and volume.
Through the independent driving circuit structure, the safety of the ground fault protection device is improved, safety hazards are reduced, cost is saved, and the device volume is reduced, while the circuit structure is simplified.
Smart Images
Figure CN119297927A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the electrical field, and in particular to a ground fault protection device, an electrical connection device and an electrical appliance. Background Art
[0002] With the progress of society and the popularization of household appliances, personal and property safety accidents caused by leakage have also increased. Therefore, more and more electrical equipment chooses to be equipped with ground fault circuit breaker (GFCI). However, some high-power electrical appliances only work at specific times. If the power cannot be cut off when in standby mode, it will bring safety risks.
[0003] At present, some ground fault protection devices with timing functions have appeared. However, the leakage protection circuit and timing circuit of some ground fault protection devices share a switch and switch drive circuit to control the power connection. However, when the timing circuit is damaged or the program is wrong, it will affect the leakage protection circuit, which may eventually lead to the loss of the leakage protection function, increase the risk and bring safety hazards. The leakage protection function of some ground fault protection devices drives different switches to control the power connection. However, the switch independently controlled by the timing circuit needs to use a large and expensive power relay due to the large current on the current-carrying line, which increases the size of the entire device and increases the cost. Summary of the invention
[0004] Based on the above problems, the first aspect of the present invention proposes a ground fault protection device, comprising: a switch unit, which is coupled between an input end and an output end of a current-carrying line and is configured to control a power connection between the input end and the output end; a leakage protection unit, comprising: a leakage detection module, which is configured to detect a leakage current signal on the current-carrying line and generate a leakage fault signal when the leakage current signal is detected; a leakage driving module, which is coupled to the switch unit and the leakage detection module and is configured to drive the switch unit to disconnect the power connection in response to the leakage fault signal, wherein the leakage driving module The module includes a first coil; a timing unit, including: a timing control module, which is configured to perform timing in response to a duration setting signal and generate a timing opening signal after reaching a first preset duration; a time setting module, which is coupled to the timing control module and is configured to send the duration setting signal to the timing control module; a timing drive module, which is independently set from the leakage drive module and coupled to the timing control module and the switch unit, and is configured to drive the switch unit to disconnect the power connection in response to the timing opening signal, wherein the timing drive module includes a second coil independent of the first coil.
[0005] In some embodiments, the timing control module is also configured to generate a reset drive signal, and the timing unit also includes: a reset drive module, which is independently set up from the leakage drive module and coupled to the timing control module and the switch unit, and is configured to drive the switch unit to connect the power connection in response to the reset drive signal, wherein the reset drive module includes a third coil independent of the first coil.
[0006] In some embodiments, the timing control module is further configured to continue timing after generating the timing opening signal and generate the reset drive signal after reaching a second preset time length.
[0007] In some embodiments, the second coil and the third coil have a common terminal, and the common terminal is coupled to the input terminal.
[0008] In some embodiments, the first coil, the second coil and the third coil share a coil support.
[0009] In some embodiments, the ground fault protection device also includes: a reset unit, which is coupled to the timing control module and the leakage driving module, and is configured to generate a first reset signal and a second reset signal when subjected to external operation; wherein the timing control module is also configured to generate the reset drive signal in response to the first reset signal to drive the switch unit to connect the power connection, and the leakage driving module is also configured to maintain the switch unit to connect the power connection in response to the second reset signal.
[0010] In some embodiments, the reset unit includes a first reset switch coupled to the timing control module and a second reset switch coupled to the leakage driving module.
[0011] In some embodiments, the reset driving module further includes a first semiconductor element, which is coupled to the third coil and configured to control a current on the third coil in response to the reset driving signal, thereby closing the power connection.
[0012] In some embodiments, the timing driving module further includes a second semiconductor element, which is coupled to the second coil and configured to control the current on the second coil in response to the timing opening signal, thereby disconnecting the power connection.
[0013] In some embodiments, the leakage driving module further includes a third semiconductor element, which is coupled to the first coil and configured to control the current on the first coil in response to the leakage fault signal, thereby disconnecting the power connection.
[0014] In some embodiments, the timing control module is further configured to generate time information based on the first preset duration, and the timing unit further includes: a time display module, which is coupled to the timing control module and configured to display the time information.
[0015] In some embodiments, the time display module includes one of a light emitting diode, a digital tube and a liquid crystal screen.
[0016] In some embodiments, the time setting module includes one of a key switch, a pressure sensor, a touch sensor, a potentiometer, and a multi-level switch.
[0017] In some embodiments, the timing unit further includes: a power supply module, which is coupled to the timing control module and is configured to provide required power to the timing control module.
[0018] In some embodiments, the leakage protection unit also includes: a self-test module, which is coupled to the leakage detection module and the leakage driving module, and is configured to periodically generate the simulated leakage current to detect whether the leakage detection module and / or the leakage driving module fails, and generate a self-test fault signal when the leakage detection module and / or the leakage driving module fails.
[0019] A second aspect of the present invention provides an electrical connection device, comprising: a housing; and a ground fault protection device according to any one of the embodiments of the first aspect, wherein the ground fault protection device is accommodated in the housing.
[0020] A third aspect of the present invention provides an electrical appliance, comprising: a load device; and an electrical connection device coupled between a power supply line and the load device for supplying power to the load device, wherein the electrical connection device comprises a ground fault protection device according to any one of the embodiments of the first aspect.
[0021] The present invention provides independent driving circuits for the leakage protection function and the timing function of the ground fault protection device, and drives the same switch to control the power connection between the input end and the output end, thereby eliminating potential safety hazards, further improving the safety of the ground fault protection device, saving costs, and reducing the size of the device. In addition, the device of the present invention has a simple circuit structure, low cost and high safety. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] 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.
[0023] Figure 1 A schematic structural diagram of a ground fault protection device according to an embodiment of the present invention is shown;
[0024] Figure 2 An exemplary schematic diagram of a ground fault protection device according to an embodiment of the present invention is shown;
[0025] Figures 3A-3G Shows Figure 2 An exemplary schematic diagram of several circuit modules in an embodiment of the present invention;
[0026] Figures 4A-4C An exemplary schematic diagram of several circuit modules of a ground fault protection device according to another embodiment of the present invention is shown. DETAILED DESCRIPTION
[0027] In the following specific description of the preferred embodiments, reference will be made to the attached drawings which constitute a part of the present invention. The attached drawings show by way of example specific embodiments that can implement the present invention. The illustrative embodiments are not intended to be exhaustive of all embodiments according to the present invention. It will be appreciated that other embodiments may be utilized, and structural or logical modifications may also be made without departing from the scope of the present invention. Therefore, the following specific description is not restrictive, and the scope of the present invention is limited by the appended claims.
[0028] Before introducing the embodiments of the present invention, some terms involved in the present invention are first explained to facilitate a better understanding of the present invention.
[0029] The terms "connection" or "coupling" and similar terms used in the present invention 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.
[0030] The terms "include", "comprising" and similar terms used in the present invention should be understood as open terms, that is, "including / includes but not limited to", indicating that other contents 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 expressions 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 a suitable manner in any one or more embodiments or examples. 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, without contradiction.
[0031] The present invention aims to provide a ground fault protection device. In the ground fault protection device, by providing independent driving circuits for the leakage protection function and the timing function, and driving the same switch to control the power connection between the input end and the output end, potential safety hazards are eliminated, and the safety of the ground fault protection device is further improved while saving costs and reducing the size of the device. In addition, the device of the present invention has a simple circuit structure, low cost and high safety.
[0032] Figure 1 FIG. 2 shows a schematic diagram of a ground fault protection device according to an embodiment of the present invention. Figure 1As shown in FIG. 1 , the ground fault protection device 100 includes a switch unit 103, a leakage protection unit 104 and a timing unit 105. The switch unit 103 is coupled between the input end 101 and the output end 102 of the current-carrying line, and controls the power connection between the input end 101 and the output end 102. The current-carrying line may include a first current-carrying line (HOT) for connecting to a phase line of a power grid and a second current-carrying line (WHITE) for connecting to a neutral line of a power grid, that is, the first current-carrying line is a phase line, and the second current-carrying line is a neutral line. The leakage protection unit 104 includes a leakage detection module 1041 and a leakage driving module 1042. The leakage detection module 1041 detects a leakage current signal on the current-carrying line, and generates a leakage fault signal when the leakage current signal is detected. The leakage driving module 1042 is coupled to the switch unit 103 and the leakage detection module 1041, receives the leakage fault signal, and drives the switch unit 103 to disconnect the power connection in response to the leakage fault signal. The leakage driving module 1042 includes a first coil. The leakage driving module 1042 drives the switch unit 103 to connect or disconnect the power connection between the input terminal 101 and the output terminal 102 by controlling the current flowing through the first coil. The timing unit 105 includes a timing control module 1051, a time setting module 1052 and a timing driving module 1053. The timing control module 1051 performs timing in response to the duration setting signal, and generates a timing opening signal after reaching a first preset duration. The first preset duration can be, for example, a preset working time of a load device. The time setting module 1052 is coupled to the timing control module 1051 and sends a duration setting signal to the timing control module 1051. The duration setting signal can be sent to the timing control module 1051 by manual operation (for example, by operating a button). The timing driving module 1053 is set independently of the leakage driving module 1042 and is coupled to the timing control module 1051 and the switch unit 103. The timing driving module 1053 drives the switch unit 103 to disconnect the power connection in response to the timing opening signal. The timing driving module 1053 includes a second coil independent of the first coil. The timing driving module 1053 drives the switch unit 103 to connect or disconnect the power connection between the input terminal 101 and the output terminal 102 by controlling the current flowing through the second coil.
[0033] In some embodiments, the timing unit 105 further includes a reset driver module ( Figure 11042). The timing control module 1051 also generates a reset drive signal. The reset drive module is independently provided from the leakage drive module 1042 and is coupled to the timing control module 1051 and the switch unit 103. The reset drive module receives the reset drive signal and drives the switch unit 103 to connect the power connection between the input terminal 101 and the output terminal 102 in response to the reset drive signal. The reset drive module includes a third coil independent of the first coil. The reset drive module drives the switch unit 103 to connect or disconnect the power connection between the input terminal 101 and the output terminal 102 by controlling the current flowing through the third coil. By providing the reset drive module, the ground fault protection device 100 can have the function of timing reset, which increases the convenience and flexibility of product use.
[0034] In some embodiments, the timing control module 1051 continues timing after generating the timing trip signal, and generates a reset drive signal after reaching a second preset time. The second preset time can be, for example, a preset standby time of the load device. In this way, the ground fault protection device 100 can automatically perform a timing reset without manual operation, further increasing the convenience and flexibility of product use.
[0035] In some embodiments, the second coil and the third coil have a common terminal, and the common terminal is coupled to the input terminal. In this way, manufacturing the fault protection device 100 can be made more convenient.
[0036] In some embodiments, the first coil, the second coil and the third coil share a coil support. In this way, the manufacturing cost of the ground fault protection device 100 can be further reduced and its volume can be reduced.
[0037] In some embodiments, the ground fault protection device 100 further includes a reset unit ( Figure 1 1042). The reset unit is coupled to the timing control module 1051 and the leakage driving module 1042, and generates a first reset signal and a second reset signal when subjected to external operation. The timing control module 1051 receives the first reset signal, and generates a reset driving signal in response to the first reset signal to drive the switch unit 103 to connect the power connection. The leakage driving module 1042 receives the second reset signal, and drives the switch unit 103 to maintain the power connection in response to the second reset signal. By providing the reset unit, the ground fault protection device 100 can be reset when needed, further increasing the convenience and flexibility of product use.
[0038] In some embodiments, the reset unit includes a first reset switch coupled to the timing control module 1051 and a second reset switch coupled to the leakage driving module 1042. A first reset signal may be generated by operating the first reset switch and a second reset signal may be generated by operating the second reset switch.
[0039] In some embodiments, the reset drive module further includes a first semiconductor element. The first semiconductor element is coupled to the third coil and controls the current on the third coil in response to the reset drive signal, thereby connecting the power connection. The first semiconductor element can be any one of a thyristor, a bipolar transistor, a field effect transistor, and a photoelectric coupling element.
[0040] In some embodiments, the timing drive module 1052 further includes a second semiconductor element. The second semiconductor element is coupled to the second coil, and controls the current on the second coil in response to the timing opening signal, thereby disconnecting the power connection. The second semiconductor element can be any one of a thyristor, a bipolar transistor, a field effect transistor, and a photoelectric coupling element.
[0041] In some embodiments, the leakage driving module 1042 further includes a third semiconductor element. The third semiconductor element is coupled to the first coil, and controls the current on the first coil in response to the leakage fault signal, thereby disconnecting the power connection. The third semiconductor element can be any one of a thyristor, a bipolar transistor, a field effect transistor, and a photoelectric coupling element.
[0042] In some embodiments, the timing control module 1051 also generates time information based on the first preset duration. The timing unit 105 also includes a time display module, which is coupled to the timing control module 1051 and displays the time information. In this way, the user can conveniently view the time information related to the product operation.
[0043] In some embodiments, the time display module includes one of a light emitting diode, a digital tube and a liquid crystal screen.
[0044] In some embodiments, the time setting module 1052 includes one of a key switch, a pressure sensor, a touch sensor, a potentiometer, and a multi-level switch.
[0045] In some embodiments, the timing unit 105 further includes a power supply module, which is coupled to the timing control module 1051 and provides the timing control module 1051 with required power.
[0046] In some embodiments, the leakage protection unit 104 also includes a self-test module, which is coupled to the leakage detection module 1041 and the leakage driving module 1042, and periodically generates a simulated leakage current to detect whether the leakage detection module 1041 and / or the leakage driving module 1042 fails, and generates a self-test fault signal when the leakage detection module 1041 and / or the leakage driving module 1042 fails.
[0047] Reference below Figure 2-3G A ground fault protection device according to an embodiment of the present invention is described. Figure 2 An exemplary schematic diagram of a ground fault protection device according to an embodiment of the present invention is shown. Figures 3A-3G Shows Figure 2 An exemplary schematic diagram of several circuit modules in an embodiment of the present invention.
[0048] Also refer to Figure 2-3G The ground fault protection device 200 is coupled between the power supply line and the load device, and includes a switch unit 103, a leakage protection unit, a timing unit, a reset unit 106 and a self-test unit 107. The current-carrying line includes a first current-carrying line (HOT) 11 and a second current-carrying line (WHITE) 12, that is, the first current-carrying line 11 is a phase line, and the second current-carrying line 12 is a neutral line. The switch unit 103 is coupled between the input end and the output end of the current-carrying line, and is used to control the power connection of the current-carrying line. The leakage protection unit includes a leakage detection module 1041 and a leakage driving module 1042. The leakage detection module 1041 includes current transformers CT1 and CT2, a leakage detection chip U1 and its peripheral circuits. The first current-carrying line 11 and the second current-carrying line 12 pass through the current transformers CT1 and CT2. The leakage driving module 1042 includes a first coil SOL1, a thyristor Q1 (a third semiconductor element) and its peripheral circuits. The timing unit includes a timing control module 1051 , a time setting module 1052 , a timing driving module 1053 , a reset driving module 1054 , a time display module 1055 and a power supply module 1056 .
[0049] The timing control module 1051 includes a timing control chip U2 and its peripheral circuits. The time setting module 1052 includes a capacitor C18 and a key switch S1 connected in parallel, one end of which is connected in parallel to the ground and the other end is connected to the pin 14 ( Figure 3A The timing drive module 1053 is independent of the leakage drive module 1042 and includes a second coil SOL3 independent of the first coil SOL1 and a thyristor Q3 (a second semiconductor element). The control electrode of the thyristor Q3 is connected to the pin 15 ( Figure 3A The anode is connected to one end of the second coil SOL3 ( Figure 2The cathode is grounded (shown as NET_SOL3). The reset drive module 1054 is independent of the leakage drive module 1042, and includes a third coil SOL2 independent of the first coil SOL1 and a thyristor Q4 (a first semiconductor element). The second coil SOL3 and the third coil SOL2 can be two independent coils or two non-independent coils. For example, the second coil SOL3 and the third coil SOL2 can share part of the winding, or the second coil SOL3 and the third coil SOL2 can be the same coil, and a specific connection method can be used to make the current flowing through them in opposite directions, thereby realizing the functions of the second coil SOL3 and the third coil SOL2 respectively. The control electrode of the thyristor Q4 is connected to pin 16 ( Figure 3A The anode is connected to one end of the third coil SOL2 ( Figure 2 The cathode is grounded. The second coil SOL3 and the third coil SOL2 have a common terminal, which is coupled to the input terminal ( Figure 2 ) Figure 2 As shown in FIG. 1 , the first coil SOL1, the second coil SOL3 and the third coil SOL2 share a coil support. When current flows through the first coil SOL1, the second coil SOL3 and the third coil SOL2, the magnetic fields generated by the first coil SOL1 and the third coil SOL2 are in the same direction, but opposite to the magnetic field generated by the second coil SOL3. The time display module 1055 is connected to pins 1-3 ( Figure 3A CL1-CL3) and 10-11 ( Figure 3A COM1 and COM2) for receiving and displaying the time information generated by the timing control chip U2. The time display module 1055 includes a plurality of light emitting diodes to display the time information. The power supply module 1056 is connected to the input end ( Figure 2 The current is passed through the first current-carrying line 11-D9-R25-ZD2 to generate a +3.3V regulated power supply to provide the required power for the timing control chip U2. The power module 1056 also includes voltage divider circuits R21 and R22, which are connected in series with pin 9 ( Figure 3A is shown as VIN).
[0050] like Figure 2 and Figure 3G As shown, the reset unit 106 includes a first reset switch RESET2 and a capacitor C17 connected in parallel, one end of which is connected in parallel to ground, and the other end is connected to the pin 13 ( Figure 3AThe reset unit 106 further includes a second reset switch RESET1 connected in parallel with the thyristor Q1 of the leakage driving module 1042. The self-test module 107 includes a trigger diode ZD1, a capacitor C11, a thyristor Q2 and some peripheral components. The control electrode of the thyristor Q2 is connected to the pin 5 of the leakage detection chip U1.
[0051] The ground fault protection device 200 has a leakage protection function. Under normal working conditions, current flows through the first current-carrying line 11-C6-DB1-R7-SOL1-GND, and a magnetic field is generated on the first coil SOL1, which is used to maintain the power connection between the input end and the output end of the switch unit 103. On the other hand, the current is supplied to the leakage detection chip U1 through the first current-carrying line 11-D1-R4. When there is leakage current on the first current-carrying line 11 or the second current-carrying line 12, the current transformer CT1 detects the leakage current signal, and the secondary end generates a corresponding induction signal, and transmits the induction signal to the leakage detection chip U1 for processing. When the value of the processed leakage current is greater than the set threshold, pin 5 of the leakage detection chip U1 outputs a high level (leakage fault signal), otherwise it outputs a low level. The high level of pin 5 of the leakage detection chip U1 is provided to the control electrode of the thyristor Q1 via the diode D3 and the resistor R10, triggering the thyristor Q1 to turn on and maintain it. The current no longer flows through the first coil SOL1, but flows through the thyristor Q1-GND. The magnetic field on the first coil SOL1 disappears, driving the switch unit 103 to disconnect the power connection between the input end and the output end, thereby achieving leakage protection.
[0052] The ground fault protection device 200 also has a self-checking function. The current charges the capacitor C11 through the first current-carrying line 11-D7-R3. As the voltage across the capacitor C11 increases, the voltage across the trigger diode ZD1 also increases. After a preset period of time, the voltage across the trigger diode ZD1 reaches the trigger threshold, the trigger diode ZD1 is turned on, and the current flows through the current transformer CT1 through C11-ZD1-R5 to generate a simulated leakage current, and at the same time, the capacitor C8 is charged through R9. In the normal working state of the ground fault protection device 200, that is, the leakage detection module 1041 and the leakage driving module 1042 are both working normally, the current transformer CT1 detects the simulated leakage current, and its secondary end generates a corresponding induction signal and transmits it to the leakage detection chip U1. The pin 5 of the leakage detection chip U1 outputs a high level, and the current charges the capacitor C10 through D3-R10. At the same time, the current triggers the thyristor Q2 to turn on through R17. The capacitor C11 rapidly releases electricity through the thyristor Q2, and the voltage at the upper end of the capacitor C11 rapidly drops. When it drops to a voltage lower than the trigger voltage of the trigger diode ZD1, the trigger diode ZD1 is turned off. The pin 5 of the leakage detection chip U1 becomes a low level. Since the time of this process is extremely short, the voltages at both ends of the capacitors C8 and C10 are relatively low, which is not enough to trigger the thyristor Q1 to turn on, and thus will not affect the normal operation of the ground fault protection device 200. In this process, the switch unit 103 will not be disconnected, but will remain in a closed state.
[0053] When the leakage detection module 1041 fails and cannot detect the simulated leakage current, the pin 5 of the leakage detection chip U1 remains at a low level, and cannot trigger the thyristor Q2 to turn on. The capacitor C11 cannot quickly release the electricity through the thyristor Q2, and the trigger diode ZD1 is turned on for a long time. The current continues to charge the capacitor C8 through the resistor R9 (i.e., a self-test fault signal is generated), so that the voltage across C8 rises to a certain level, which is enough to trigger the thyristor Q1 to turn on through D5-R10. The current no longer flows through the first coil SOL1, but flows through the thyristor Q1-GND, the magnetic field on the first coil SOL1 disappears, and the driving switch unit 103 disconnects the power connection between the input end and the output end, thereby realizing fault self-test.
[0054] The ground fault protection device 200 also has a timing function. The current generates a +3.3V regulated power supply through the first current-carrying line 11-D9-R25-ZD2 to power the timing control chip U2. At the same time, the input voltage is input to the timing control chip U2 after being divided by resistors R21 and R22. The timing control chip U2 determines whether the input voltage is greater than the set value. When the input voltage is greater than the set value, the pin 16 of the timing control chip U2 sends a high-level pulse (reset drive signal), triggering the thyristor Q4 of the reset drive module 1054 to turn on, and a large current flows through the first current-carrying line 11-SOL2-Q4-GND. The third coil SOL2 generates a large magnetic field, driving the switch unit 103 to connect the power connection between the input end and the output end. Press the key switch S1 of the time setting module 1052, and the time setting module 1052 sends a low-level signal (duration setting signal) to the pin 14 of the timing control chip U2 to set the first preset duration. The timing control chip U2 determines the first preset duration and starts timing. The first preset duration may be, for example, the working duration of the load device, which may also be preset in the timing control chip U2. In addition, the timing control chip U2 generates time information based on the first preset duration, and drives LD1-LD6 of the time display module 1055 to display the time information. The time information may be, for example, a countdown from the first preset duration, which is used to indicate the remaining working time of the load device to the user. After the timing reaches the first preset duration, the timing control chip U2 generates and sends a high-level pulse (timing opening signal) through pin 15, triggering the thyristor Q3 of the timing drive module 1053 to turn on, a large current flows through the first current-carrying line 11-SOL3-Q3-GND, and the second coil SOL3 generates a large magnetic field (at least offsets part of the magnetic field generated by the first coil SOL1, so that the switch unit 103 cannot remain in the on state), driving the switch unit 103 to disconnect the power connection between the input end and the output end. The timing control chip U2 continues timing after sending out a high-level pulse, and after reaching the second preset duration (i.e., entering the next time period), generates and sends out a high-level pulse (reset drive signal) again through pin 16, triggering the thyristor Q4 of the reset drive module 1054 to turn on, and driving the switch unit 103 to connect the power connection between the input end and the output end. The second preset duration can be, for example, the standby duration of the load device, which can be preset in the timing control chip U2 or set by operating the button S1. The timing control chip U2 can also generate time information based on the second preset duration, and drive LD1-LD6 of the time display module 1055 to display the time information. The time information at this time can be, for example, a countdown starting from the second preset duration, which is used to indicate the remaining standby time of the load device to the user.
[0055] In addition, when the ground fault protection device 200 detects leakage current and trips, it can also be reset by the reset unit 106. Press the first reset switch RESET2 and the second reset switch RESET1 of the reset unit 106. The reset unit 106 sends a low-level signal (first reset signal) to the timing control chip U2, and the timing control chip U2 generates and sends a high-level pulse (reset drive signal) again through pin 16, triggering the thyristor Q4 of the reset drive module 1054 to turn on, and driving the switch unit 103 to connect the power connection between the input end and the output end. On the other hand, pressing the second reset switch RESET1 turns off the thyristor Q1, and the current flows through the first coil SOL1 again, maintaining the switch unit 103 to connect the power connection between the input end and the output end.
[0056] Figures 4A-4C An exemplary schematic diagram of several circuit modules of a ground fault protection device according to another embodiment of the present invention is shown.
[0057] In this embodiment, the time setting module 2052 includes a pressure sensor S1 and is connected to pin 14 of the timing control module 2051. The time setting module 2052 can be provided with a +3.3V power supply voltage by a power supply module that provides power to the timing control module 2051. When the pressure sensor S1 detects external force pressing, the time setting module 2052 sends a low level signal (duration setting signal) to pin 14 of the timing control chip U2 to set a first preset duration, and the timing control chip U2 determines the first preset duration and starts timing. The time display module 2055 includes a digital tube, which is connected to pins 1-4 ( Figure 4A CL1-CL4) and 10-11 ( Figure 4A COM1 and COM2), receiving and displaying the time information sent by the timing control chip U2.
[0058] In other embodiments, the time setting module 2052 may include other types of timing elements, such as a touch sensor, a potentiometer, or a multi-level switch. The time display module 2055 may include other types of display elements, such as a liquid crystal screen.
[0059] A second aspect of the present invention provides an electrical connection device, comprising: a housing; and a ground fault protection device according to any one of the above embodiments, the ground fault protection device being accommodated in the housing.
[0060] The third aspect of the present invention proposes an electrical appliance, comprising: a load device; and an electrical connection device, which is coupled between the current-carrying line and the load device and is used to supply power to the load device, and the electrical connection device comprises a ground fault protection device of any one of the above embodiments.
[0061] 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 ground fault protection device, comprising: a switch unit coupled between an input end and an output end of the current-carrying line and configured to control a power connection between the input end and the output end; Leakage protection unit, including: a leakage detection module, configured to detect a leakage current signal on the current-carrying line and generate a leakage fault signal when the leakage current signal is detected; a leakage driving module, coupled to the switch unit and the leakage detection module, and configured to drive the switch unit to disconnect the power connection in response to the leakage fault signal, wherein the leakage driving module includes a first coil; Timing unit, comprising: A timing control module, which is configured to perform timing in response to a duration setting signal and generate a timing opening signal after reaching a first preset duration; a time setting module, which is coupled to the timing control module and is configured to send a duration setting signal to the timing control module; A timing drive module is independently arranged from the leakage drive module and coupled to the timing control module and the switch unit, and is configured to drive the switch unit to disconnect the power connection in response to the timing opening signal, wherein the timing drive module includes a second coil independent of the first coil.
2. The ground fault protection device according to claim 1, wherein: The timing control module is further configured to generate a reset drive signal, and the timing unit further comprises: A reset driving module is independently arranged from the leakage driving module and coupled to the timing control module and the switch unit, and is configured to drive the switch unit to connect the power connection in response to the reset driving signal, wherein the reset driving module includes a third coil independent of the first coil.
3. The ground fault protection device according to claim 2, wherein: The timing control module is further configured to continue timing after generating the timing opening signal and generate the reset drive signal after reaching a second preset time length.
4. The ground fault protection device according to claim 2, wherein: The second coil and the third coil have a common terminal, and the common terminal is coupled to the input terminal.
5. The ground fault protection device according to claim 2 or 4, wherein: The first coil, the second coil and the third coil share a coil support.
6. The ground fault protection device according to claim 2, further comprising: a reset unit, coupled to the timing control module and the leakage driving module, and configured to generate a first reset signal and a second reset signal when subjected to an external operation; The timing control module is further configured to generate the reset drive signal in response to the first reset signal to drive the switch unit to connect the power connection, and the leakage drive module is further configured to maintain the switch unit to connect the power connection in response to the second reset signal.
7. The ground fault protection device according to claim 6, wherein: The reset unit includes a first reset switch coupled to the timing control module and a second reset switch coupled to the leakage driving module.
8. The ground fault protection device according to claim 2, wherein: The reset driving module further includes a first semiconductor element coupled to the third coil and configured to control a current on the third coil in response to the reset driving signal, thereby closing the power connection.
9. The ground fault protection device according to claim 1, wherein: The timing driving module further includes a second semiconductor element coupled to the second coil and configured to control the current on the second coil in response to the timing opening signal, thereby disconnecting the power connection.
10. The ground fault protection device according to claim 1, wherein: The leakage driving module further includes a third semiconductor element coupled to the first coil and configured to control the current on the first coil in response to the leakage fault signal, thereby disconnecting the power connection.
11. The ground fault protection device according to claim 1, wherein: The timing control module is further configured to generate time information based on the first preset duration, and the timing unit further includes: The time display module is coupled to the timing control module and is configured to display the time information.
12. The ground fault protection device according to claim 11, wherein: The time display module includes one of a light emitting diode, a digital tube and a liquid crystal screen.
13. The ground fault protection device according to claim 1, wherein: The time setting module includes one of a key switch, a pressure sensor, a touch sensor, a potentiometer and a multi-speed switch.
14. The ground fault protection device according to claim 1, wherein: The timing unit also includes: The power supply module is coupled to the timing control module and is configured to provide required power to the timing control module.
15. The ground fault protection device according to claim 1, wherein: The leakage protection unit also includes: A self-test module is coupled to the leakage detection module and the leakage driving module, and is configured to periodically generate the simulated leakage current to detect whether the leakage detection module and / or the leakage driving module fails, and generate a self-test fault signal when the leakage detection module and / or the leakage driving module fails.
16. An electrical connection device, comprising: case; as well as The ground fault protection device according to any one of claims 1 to 15, wherein the ground fault protection device is accommodated in the housing.
17. An electrical appliance, comprising: Load equipment; as well as An electrical connection device, coupled between a power supply line and the load device, for supplying power to the load device, wherein the electrical connection device comprises a ground fault protection device according to any one of claims 1 to 15.