Renter friendly standard to smart switch conversion using voltage sensing

Abstract

According to certain embodiments, a switch cover comprises a panel with a hole, wherein the hole is configured to receive a rocker, wherein the rocker selectively controls an electrical connection between a first line and a second line; a voltage sensor disposed on the panel and configured to induce a current from an electrical field generated by electrical power transmitted over the electrical connection between the first line and the second line; and an antenna disposed on the panel and configured to transmit a radio signal in response to induction of the current in the voltage sensor.

Description

[0001] 2024PF80228

[0002] 1

[0003] RENTER FRIENDLY STANDARD TO SMART SWITCH CONVERSION USING

[0004] VOLTAGE SENSING

[0005] FIELD

[0006] The disclosure relates to smart switches. More particularly, the disclosure relates to converting from legacy switches to smart switches.

[0007] DESCRIPTION OF THE RELATED ART

[0008] Legacy switches can be connected a wire from a circuit breaker that is always hot (bottom wire) and a wire that is hardwired to a light or ceiling fan (top wire). The user can switch on or off the light or ceiling fan by moving a rocker. When the rocker is in one placement, such as down, the bottom wire and top wire are disconnected. When the rocker is in the other placement, such as up, the bottom wire and the top wire are connected. When the bottom wire and the top wire are connected, power from a power source (through the circuit breaker) is provided to a light, ceiling fan, exhaust fan, garbage disposal, or other appliance.

[0009] However, the legacy switch only turns on the appliance that is hardwired to the legacy switch. It is common that when a user enters / leaves a room, the user would like all of the lights in the room to be switched on / off. With a legacy switch, the user would have to switch on / off each and every individual switch.

[0010] SUMMARY

[0011] According to certain embodiments, a switch cover comprises a panel with a hole, wherein the hole is configured to receive a rocker, wherein the rocker selectively controls an electrical connection between a first line and a second line; a voltage sensor disposed on the panel and configured to induce a current from an electrical field generated by electrical power transmitted over the electrical connection between the first line and the second line; and an antenna disposed on the panel and configured to transmit a radio signal in response to induction of the current in the voltage sensor.

[0012] According to certain embodiments, a method comprises: inducing a current by a voltage sensor disposed on a panel with hole receiving a rocker selectively controlling an electrical connection between a first connection point and a second connection point, based 2024PF80228

[0013] 2 on an amount of electrical power transmitted between the first connection point and the second connection point; when detecting a change in the amount of current from below a threshold to above the threshold, transmitting a radio signal indicating a switched on condition with an antenna; and when detecting a change in the amount of current from above the threshold to below the threshold, transmitting a radio signal indicating a switched off condition with the antenna.

[0014] BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The above and other aspects, features, and advantages of certain embodiments of the disclosure will be more apparent from the following description taken in conjunction with the accompanying drawings, in which:

[0016] Fig. 1 A is a block diagram of a home lighting system in the switched off state in accordance with an embodiment of the disclosure;

[0017] Fig. IB is a block diagram of a home lighting system in the switched on state in accordance with an embodiment of the disclosure;

[0018] Fig. 2 is a block diagram of a wall switch cover and electrical switch in accordance with an embodiment of the disclosure;

[0019] Fig. 3 is a block diagram of a panel in accordance with an embodiment of the disclosure;

[0020] Fig. 4 is a block diagram of a smart appliance in accordance with an embodiment of the disclosure;

[0021] Fig. 5 is a flow diagram of a method in accordance with an embodiment of the disclosure; and

[0022] Fig. 6 is a block diagram of another wall switch cover in accordance with an embodiment of the disclosure.

[0023] DETAILED DESCRIPTION

[0024] It should be appreciated that various embodiments of the present disclosure and the terms used therein are not intended to limit the technological features set forth herein to particular embodiments and include various changes, equivalents, or replacements for a corresponding embodiment. With regard to the description of the drawings, similar reference numerals may be used to refer to similar or related elements. It is to be understood that a singular form of a noun corresponding to an item may include at least one of the things, unless the relevant context clearly indicates otherwise. As used herein, each of such phrases 2024PF80228

[0025] 3 as "A or B," "at least one of A and B," "at least one of A or B," "A, B, or C," "at least one of A, B, and C," and "at least one of A, B, or C," may include any one of, or all possible combinations of the items enumerated together in a corresponding one of the phrases. As used herein, such terms as "1st" and "2nd," or "first" and "second" may be used to simply distinguish a corresponding component from another, and does not limit the components in other aspect (e.g., importance or order). It is to be understood that if an element (e.g., a first element) is referred to, with or without the term "operatively" or "communicatively", as "coupled with," "coupled to," "connected with," or "connected to" another element (e.g., a second element), it means that the element may be coupled with the other element directly (e.g., wiredly), wirelessly, or via a third element.

[0026] As used herein, the term "module" may include a unit implemented in hardware, software, or firmware, and may interchangeably be used with other terms, for example, "logic," "logic block," "part," or "circuitry". A module may be a single integral component, or a minimum unit or part thereof, adapted to perform at least one functions. For example, according to an embodiment, the module may be implemented in a form of an application-specific integrated circuit (ASIC).

[0027] It shall be understood in this document that “detection” or “detecting” a condition is not necessarily direct detection or detecting of the condition. For example, detection of a condition can include detection of a circumstance that logically implies the condition.

[0028] It shall also be understood that an action that occurs “in response to,” “responsive to”, or “when” to an event, shall not be limited to directly “in response to”, “responsive to” or “when” the event occurs or to the first action that occurs, but may be “in response to,” “responsive to,” or “when” any number of other intervening actions that logically imply that the event has occurred.

[0029] A building or home that was originally made with legacy switches, can be repurposed with smart switches. However, this often involves manipulation of the wires connected to the legacy switch, including the hot wire from the circuit breaker. Thus, an end user may have to seek the services of an electrician, thereby increasing the cost.

[0030] Certain embodiments of this disclosure may provide a wall switch cover that provides smart switch capabilities. A user may simply replace a legacy wall switch cover with a wall switch cover described in certain embodiments of the disclosure to enjoy the benefits of a smart switch. 2024PF80228

[0031] 4

[0032] Referring to Fig. 1 A and IB, there is illustrated a block diagram of a home lighting system. The home lighting system 100 includes a wall switch cover 105, an electrical switch 110, a legacy appliance 115, and a smart appliance 120. FIG. 1 A shows the home lighting system 100 when the legacy appliance 115 is switched off. FIG. IB shows the home lighting system 100 when the legacy appliance 115 is switched off. The wall switch cover 105 is configured to provide a radio signal to the smart appliance 120, when the legacy appliance 115 is switched on.

[0033] It is noted home lighting is used by way of example, and other embodiments do not require lighting. A “legacy appliance” can be an appliance that does not wirelessly communicate its status with other appliances.

[0034] The electrical switch 110 controls an electrical connection between first and second connection points I l la, 111b that can be detachably connected, respectively, to a first line 112a and a second line 112b. The first line 112a can provide power from a power source 113 and can be “hot” or “live”. The second line 112b can be hard wired to the legacy appliance 115. The electrical switch 110 includes a rocker 114. In certain embodiments, based on its position, the rocker 114 can either establish or break an electrical connection between the connection points I l la, 11 lb, and consequently between the first line 112a and the second line 112b. For example, when the rocker 114 is one position, the electrical connection is established between the connection points I l la, 11 lb, and when the rocker 114 is an opposite position, the electrical connection is broken. In certain embodiments, the rocker 114 can include, but is not limited to a lever or a paddle. When the electrical connection is established between the connection points I l la, 111b, electrical power is transmitted from the power source 113 to the legacy appliance 115, thereby switching it on. When the electrical connection is broken between the connection point I l la, 111b, electrical power is not transmitted from the power source 113 to the legacy appliance 115, thereby switching it off. It is noted that although a legacy appliance 115 is shown, the disclosure is not limited to connection to a legacy appliance 115. In certain embodiments, the position of the rocker 114 can control the electrical resistance between the connection points I l la, 11 lb, thereby controlling the amount of electrical power that is transmitted to the legacy appliance 115.

[0035] The legacy appliances may include any of a variety of electronic devices including, but not limited to, lights, ceiling fans, exhaust fans, a garbage disposal, and a heater, to name a few. 2024PF80228

[0036] 5

[0037] The wall switch cover 105 is configured to transmit a radio signal to the smart appliance 120, when power is transmitted between the connection points I l la, 111b (and consequently from the power source 113 to the legacy appliance 115). When the electrical power is transmitted between the connection points I l la, 111b through the electrical connection established by the electrical switch 110, the electrical power generates an electrical field. The wall switch cover 105 transmits a radio signal based on the electrical field (or absence thereof).

[0038] The radio signal can indicate that the legacy appliance 115 appliance has been switched on or off. The radio signal can include other information such as an identifier of the wall switch cover 105. The smart appliance 120 can be configured to detect the radio signal from the wall switch cover 105. In certain embodiments, the smart appliance 120 may act in unison with the legacy appliance 115. For example, when the legacy appliance 115 is switched on / off, the smart appliance may switch on / off. In certain embodiments, the radio signal from the wall switch cover 105 may be according to a predetermined standard for communication between smart appliances 120, such as, but not limited to, Wi-Fi, Bluetooth, Bluetooth Mesh, Zigbee, and Digital Addressable Lighting Interface (DALI), to name a few.

[0039] Referring now to Fig. 2, there is illustrated a block diagram of the wall switch cover 105 and the electrical switch 110. The electrical switch 110 can include the rocker 114, a first connection point I l la and a second connection point 11 lb. The rocker 114 can selectively establish or break an electrical connection between the first connection point I l la and the second connection point 11 lb, based on its position. The first connection point I l la can be configured to receive the first line 112a from the power source 113. The second connection point 111b can be configured to receive the second line 112b from the legacy appliance 115. Accordingly, when the rocker 114 establishes an electrical connection between the first connection point I l la and the second connection point 11 lb, power from the power source 113 is transmitted to the legacy appliance 115.

[0040] In certain embodiments, the electrical switch 110 can be mounted in a cutout of a sheet rock wall (now shown). The electrical switch 110 can include screw holes 220 that edges of the cutout of the sheet rock wall, causing the rocker 114 to protrude from the sheet rock well, while the portion of the electrical switch 110 on the opposite side of the screw holes 220 to be behind the sheet rock wall. As a result, the first line 112a and the second line 112b are behind the sheet rock wall preventing accidental contact by a user.

[0041] The wall switch cover 105 includes a panel 210 and a wall plate 215. The wall plate 215 can include plastic, but is not limited to plastic and can be include other materials. 2024PF80228

[0042] 6

[0043] Both the panel 210 and the wall plate 215 can include a hole to receive the rocker 114. In certain embodiments, the wall plate 215 can include a mounting bracket to receive the panel 210. Alternatively, the panel 210 can be affixed to the wall plate 215 with an adhesive.

[0044] In certain embodiments, wall plate 215, the panel 210, and the electrical switch 110 can include screw holes 220. A user can install the wall switch cover 105 by inserting a screw into the screw holes 220. In certain embodiments, a user can unscrew an existing conventional wall switch cover and replace it with the wall switch cover 105 in accordance with an embodiment of the disclosure. The wall switch cover 105 can cover the cutout in the sheet rock wall.

[0045] Referring now to Fig. 3, there is illustrated a block diagram of the panel 210 in accordance with an embodiment of the disclosure. The panel 210 can include a voltage sensor 305, a controller 310, an antenna 315, and a battery 320. In certain embodiments, the panel 210 can comprise a printed circuit board (PCB). Alternatively, the panel 210 can be a substrate having a circuit printed thereon.

[0046] The voltage sensor 305 can be a configured to detect an electric field that is proximate to the voltage sensor 305. For example, the panel 210 can be mounted to the wall plate 215 and then installed over the electrical switch 110, such that the rocker 114 protrudes through the hole of the panel 210. When the rocker 114 establishes an electrical connection between the first connection point I l la and the second connection point 11 lb, the power transmitted between the first connection point I l la and the second connection point 111b creates an electric field. The electric field causes induction of a current in the voltage sensor 305.

[0047] The voltage sensor 305 is connected to an input of the controller 310. The controller 310 can include but is not limited to a central processing unit (CPU), a microprocessor, an Application Specific Integrated Circuit (ASIC), or a hardware accelerator. The controller 310 can be configured determine whether there is or is not current induced at the voltage sensor 305. Based on the current at the voltage sensor 305, the controller 310 controls the antenna 315 to transmit a radio signal. In certain embodiments, the antenna 315 can include the radio front end such as, but not limited to, modulators, demodulators, filters, operational amplifiers. Alternatively, the radio front end can be integrated with the controller 310, and the controller provides a modulated and amplified signal to the antenna 315.

[0048] In certain embodiments, the controller 310 can be configured to detect that the voltage sensor 305 has changed from having less than a threshold amount of induced current to having greater than the threshold amount of induced current (leading edge). When 2024PF80228

[0049] 7 detecting a leading edge, the controller 310 can determine that electrical power is transmitted through an electrical connection established between the first connection point I l la and the second connection point 11 lb, indicating that the legacy appliance 115 has been switched on. Conversely, the controller 310 can be configured to detect that the voltage sensor 305 has changed from having more than the threshold amount to less than the threshold amount (falling edge). When detecting a falling edge, the controller 310 can determine that no electrical power is transmitted, indicating that the connection between the first connection point I l la and the second connection point 11 lb is broken and that the legacy appliance 115 has been switched off.

[0050] In certain embodiments, the controller 310 can be configured to control the antenna 315 to transmit a signal based on a change in the induced current at the voltage sensor 305. The radio signal transmitted by the antenna can be in accordance with a predetermined standard. For example, the radio signal can indicate that the legacy appliance 115 controlled by the electrical switch 110 has been switched on or off.

[0051] The panel 205 includes a battery 320 can power the controller 310 and / or antenna 315. In certain embodiments, the controller 310 can operate in a low power state. A change in the current at the voltage sensor 305 can trigger an interrupt, placing the controller 310 into a high-power mode. While in the high-power mode, the controller 310 can control the antenna 315 to transmit a signal indicating that the legacy appliance 115 has been switched on or off. When the controller 310 detects that the current at the voltage sensor 305 has remained either above the threshold, or below the threshold, the controller 310 can return to a low power state.

[0052] In certain embodiments, the controller 310 can be configured to cause the antenna to transmit a radio signal for predetermined period of time after a leading edge, indicating that the legacy appliance 115 has been switched on and for a predetermined period of time after a falling edge, indicating that the legacy appliance 115 has been switched off. In certain embodiments, the radio signal indicating a switched on event can also include an identifier of the wall switch cover 105 to be used for pairing, although the disclosure is not limited to the foregoing.

[0053] Referring now to Fig. 4, there is described a smart appliance 405 in accordance with an embodiment of the disclosure. The smart appliance 405 can include, but is not limited to, a smart bulb, or a smart socket. The smart appliance is configured to operate in two different modes - manual and paired. In the manual mode, the smart appliance 405 is configured to toggle from switched on or switched off, when button 410 is pressed. Thus, if 2024PF80228

[0054] 8 the smart appliance 405 is switched off, then pressing the button 410 causes the smart appliance to switch on, and vice versa.

[0055] However, in the paired mode, the smart appliance 405 can be configured to be paired with wall switch cover 105. When the wall switch cover 105 transmits the radio signal, indicating that the legacy appliance 115 has switched on, the user can press a pairing button 415 on the smart appliance. During pairing, the smart appliance 405 switches on and records an identifier of the wall switch cover 105. Upon pairing, at a later time when the smart appliance 405 receives a signal from the previously identified and recorded wall switch cover 105 indicating that the legacy appliance 115 is switched on / off, the smart appliance 405 also switches on / off. As a result, the smart appliance switches on and off in response to movement of the rocker 114 of the electrical switch 110.

[0056] Referring now to Fig. 5, there is illustrated a flow diagram of method in accordance with an embodiment of this disclosure. At 505, voltage sensor 305 on panel 210 induces a current based on an amount of electrical power that is transmitted between the first connection point and the second connection point of the electrical switch 110.

[0057] When there is a change in the amount of the current at the voltage sensor from either below a predetermine threshold to above the predetermine threshold or vice versa at 510, the voltage sensor 305 triggers an interrupt to the controller 310 at 515. The interrupt causes the controller 310 to change from a low power state to a high-power state at 520. When there is no change at 510, control is returned to 505.

[0058] At 520, the controller determines whether the current in the voltage sensor has changed form below a threshold to above the threshold, indicating a switched on event, or vice versa, indicating a switched off event.

[0059] When a switched on event occurs, the controller 310 controls an antenna 315 to transmit a radio signal indicating that a switched on event has occurred and an identifier of the wall switch cover at 525. When a switched off event occurs, the controller 310 controls an antenna 315 to transmit a radio signal indicating that a switched off event has occurred at 530.

[0060] Referring now to Fig. 6, there is illustrated a block diagram of wall switch cover 600 with a long nose sensor 605. The wall switch cover 600 includes a wall plate 215, and a panel 210 with holes configured to receive a rocker of an electrical switch.

[0061] A long nose sensor 605, controller 310, antenna 315, and battery 320 are disposed on the panel 210. The long nose sensor 605 is configured to induce a current based on electrical power that is transmitted between connection points 205a, 205b of a proximate 2024PF80228

[0062] 9 electrical switch 110. The long nose sensor 605 is configured to protrude close the second connection point 11 lb. Accordingly, when electrical power is transmitted through the second connection point 11 lb, a current is induced in the long nose sensor 605.

[0063] Certain embodiments of the disclosure can include a wall switch cover 105 comprising: a panel 210 with a hole, wherein the hole is configured to receive a rocker 114, wherein the rocker 114 selectively controls an electrical connection between a first connection point I l la and a second connection point 11 lb; a voltage sensor 305 disposed on the panel 210 and configured to induce a current based on an amount of electrical power transmitted between the first connection point I l la and the second connection point 11 lb; and an antenna 315 disposed on the panel 210 and configured to transmit a radio signal based on induction of the current in the voltage sensor 305.

[0064] According to certain embodiments, the wall switch cover 105 further comprises a controller 310 disposed on the panel 210, the controller 310 configured to detect the current induced in the voltage sensor 305, and control the antenna 315 to transmit the radio signal based on the current induced in the voltage sensor 305.

[0065] According to certain embodiments, the wall switch cover 105 further comprises: a battery 320 providing power to the controller 310.

[0066] According to certain embodiments, the controller 310 is configured to operate in a low power state and a high-power state, and wherein the controller 310 uses less power from the battery 320 in the low power state than in the high-power state, and wherein the voltage sensor 305 is configured to trigger an interrupt causing the controller 310 to change from the low power state to the high-power state.

[0067] According to certain embodiments, the panel 210 comprises a printed circuit board, wherein the printed circuit board connects the voltage sensor 305, the antenna 315, and the battery to the controller 310.

[0068] According to certain embodiments, the wall switch cover 105 comprises: a wall plate 215 having another hole configured to receive the rocker 114; wherein the panel 210 is mounted to the wall plate 215 such that the hole and the another hole align.

[0069] According to certain embodiments, the voltage sensor 305 comprises a capacitive sensor.

[0070] According to certain embodiments, the voltage sensor 305 comprises a long nose sensor 605.

[0071] According to certain embodiments, a method comprises: inducing a current 505 by a voltage sensor 305 disposed on a panel 210 with hole receiving a rocker selectively 2024PF80228

[0072] 10 controlling an electrical connection between a first connection point I l la and a second connection point 11 lb, based on an amount of electrical power transmitted between the first connection point I l la and the second connection point 11 lb; when detecting a change 525 in the amount of current from below a threshold to above the threshold, transmitting a radio signal indicating a switched on event with an antenna 315; and when detecting a change 530 in the amount of current from above the threshold to below the threshold, transmitting a radio signal indicating a switched off event with the antenna 315.

[0073] According to certain embodiments, the radio signal indicates the switched on event includes an identifier 525.

[0074] According to certain embodiments, the method further comprises interrupting a controller 310 when there is the change in the amount of current from below the threshold to above the threshold, or vice versa 515.

[0075] According to certain embodiments, interrupting switches the controller 310 from a low power state to a high-power state, wherein the low power state consumes less battery power than the high-power state 517.

[0076] According to certain embodiments, the controller 310 enters the low power state after the antenna 315 transmits the radio signal indicating the switched on event or the switched off event 535.

[0077] According to certain embodiments, the voltage sensor 305 comprises a capacitive sensor.

[0078] According to certain embodiments, the voltage sensor 305 comprises a long nose sensor 605.

[0079] According to an embodiment, a method according to various embodiments of the disclosure may be included and provided in a computer program product. The computer program product may be traded as a product between a seller and a buyer. The computer program product may be distributed in the form of a machine-readable storage medium (e.g., compact disc read only memory (CD-ROM)), or be distributed (e.g., downloaded or uploaded) online via an application store (e.g., PlayStore™), or between two user devices (e.g., smart phones) directly. If distributed online, at least part of the computer program product may be temporarily generated or at least temporarily stored in the machine-readable storage medium, such as memory of the manufacturer's server, a server of the application store, or a relay server.

[0080] According to various embodiments, each component (e.g., a module or a program) of the above-described components may include a single entity or multiple entities. 2024PF80228

[0081] 11

[0082] According to various embodiments, at least one of the above-described components may be omitted, or at least one other components may be added. Alternatively or additionally, a plurality of components (e.g., modules or programs) may be integrated into a single component. In such a case, according to various embodiments, the integrated component may still perform at least one functions of each of the plurality of components in the same or similar manner as they are performed by a corresponding one of the plurality of components before the integration. According to various embodiments, operations performed by the module, the program, or another component may be carried out sequentially, in parallel, repeatedly, or heuristically, or at least one of the operations may be executed in a different order or omitted, or at least one other operations may be added.

[0083] While at least one embodiments of the disclosure have been described with reference to the figures, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope as defined by the following claims.

Claims

2024PF8022812CLAIMS:

1. A wall switch cover (105) comprising: a panel (210) with a hole, wherein the hole is configured to receive a rocker (114), wherein the rocker (114) selectively controls an electrical connection between a first connection point (1 I la) and a second connection point (11 lb); a voltage sensor (305) disposed on the panel (210) and configured to induce a current based on an amount of electrical power transmitted between the first connection point (1 I la) and the second connection point (11 lb); and an antenna (315) disposed on the panel (210) and configured to transmit a radio signal based on induction of the current in the voltage sensor (305).

2. The wall switch cover (105) of claim 1, further comprising: a controller (310) disposed on the panel (210), the controller (310) configured to detect the current induced in the voltage sensor (305), and control the antenna (315) to transmit the radio signal based on the current induced in the voltage sensor (305).

3. The wall switch cover (105) of claim 2, further comprising: a battery (320) providing power to the controller (310).

4. The wall switch cover (105) of claim 3, wherein the controller (310) is configured to operate in a low power state and a high-power state, and wherein the controller (310) uses less power from the battery (320) in the low power state than in the high-power state, and wherein the voltage sensor (305) is configured to trigger an interrupt causing the controller (310) to change from the low power state to the high-power state.

5. The wall switch cover (105) of claim 3, wherein the panel (210) comprises a printed circuit board, wherein the printed circuit board connects the voltage sensor (305), the antenna (315), and the battery to the controller (310).2024PF80228136. The wall switch cover (105) of claim 1, further comprising: a wall plate (215) having another hole configured to receive the rocker (114); wherein the panel (210) is mounted to the wall plate (215) such that the hole and the another hole align.

7. The wall switch cover (105) of claim 1, wherein the voltage sensor (305) comprises a capacitive sensor.

8. The wall switch cover (105) of claim 1, wherein the voltage sensor (305) comprises a long nose sensor (605).

9. A method comprising: inducing a current (505) by a voltage sensor (305) disposed on a panel (210) with hole receiving a rocker selectively controlling an electrical connection between a first connection point (1 I la) and a second connection point (11 lb), based on an amount of electrical power transmitted between the first connection point (I l la) and the second connection point (11 lb); when detecting a change (525) in the amount of the current from below a threshold to above the threshold, transmitting a radio signal indicating a switched on event with an antenna (315); and when detecting a change (530) in the amount of the current from above the threshold to below the threshold, transmitting a radio signal indicating a switched off event with the antenna (315).

10. The method of claim 9, wherein the radio signal indicating the switched on event includes an identifier (525).

11. The method of claim 9, further comprising: interrupting a controller (310) when there is the change in the amount of the current from below the threshold to above the threshold, or vice versa (515).

12. The method of claim 11, wherein interrupting switches the controller (310) from a low power state to a high-power state, wherein the low power state consumes less battery power than the high-power state (517).2024PF802281413. The method of claim 12, wherein the controller (310) enters the low power state after the antenna (315) transmits the radio signal indicating the switched on event or the switched off event (535).

14. The method of claim 9, wherein the voltage sensor (305) comprises a capacitive sensor.

15. The method of claim 9, wherein the voltage sensor (305) comprises a long nose sensor (605).

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