Liquid heating appliance with bypass power supply circuit

Abstract

A liquid heating appliance comprises a liquid heating container, an electric heater and a control unit (16). The control unit (16) comprises an adapter component (28) for receiving a supply of electrical power and a first set of tabs (29a, 29b) electrically connected to the adapter component (28) for forming a main power supply circuit comprising the heater. The thermomechanical actuator (31) is operable at a predetermined temperature to interrupt the main power supply circuit. The control unit (16) comprises a second set of tabs (33a, 33b) connected to the adapter member (28) separately from the first set of tabs (29a, 29b) for forming a bypass power supply circuit. Each of the first set of tabs (29a, 29b) and the second set of tabs (33a, 33b) includes tabs (29a, 33a) connected to neutral electrical contacts (28c) of the adapter component (28) and tabs (29b, 33b) connected to live electrical contacts (28b) of the adapter component (28).

Description

TECHNICAL FIELD

[0001] The present invention relates to a liquid heating appliance. BACKGROUND

[0002] In a liquid heating appliance, such as a domestic kettle, an electric heater is usually provided to heat liquid stored in a liquid heating vessel of the appliance. A control unit can be provided to control the supply of electrical power to the electric heater, for example to initiate or terminate a heating operation. The liquid heating appliance is usually powered by a power base connected to a mains electricity supply.

[0003] The control unit usually comprises a switch for cutting off the supply of electrical power from the appliance when a predetermined temperature within the appliance is sensed, thereby switching off the electric heater. For example, the control unit can be arranged to disconnect the power supply when the liquid in the liquid heating vessel reaches boiling point, or when an overheating condition is detected. Typically, the control unit comprises a thermomechanical element, such as a snap-action bimetallic actuator, which operates at the predetermined temperature to open the switch to interrupt the supply of electrical power.

[0004] Such thermomechanical elements are advantageous in that they are reliable and relatively inexpensive compared to electronic temperature sensing and actuation devices.

[0005] However, there is an increasing desire for liquid heating appliances, particularly domestic appliances, to have additional functionality, including ancillary components such as electronic display screens or user interfaces. In a conventional appliance comprising a thermomechanical control unit, when the predetermined temperature is reached, the ancillary electronic components can also be disconnected from the power supply, meaning that these components can only be used when the electric heater is in operation. This can greatly reduce the utility of such a domestic appliance.

[0006] A prior solution to this problem is to replace the thermomechanical control unit with an electronic control system which senses the temperature of the liquid in the vessel and separately switches off the electric heater when the predetermined temperature is reached. This can avoid the interruption of the supply of electrical power to the entire appliance when the predetermined temperature is detected, and instead the electric heater is selectively controlled. Such an electronic control system can allow the ancillary components to continue to operate even after the electric heater is switched off.

[0007] However, this solution can greatly increase the cost and complexity of manufacturing a liquid heating appliance. SUMMARY

[0008] The present invention seeks to provide a liquid heating appliance which overcomes these problems.

[0009] Viewed from a first aspect, the present invention provides a liquid heating appliance comprising: a liquid heating vessel; an electric heater for heating liquid contained within the liquid heating vessel; and a control unit, the control unit comprising: an electrical adapter component for receiving an electrical power supply; a first set of electrical tabs connected to the electrical adapter component for electrical connection to the electrical heater to form a main power supply circuit; a thermomechanical actuator for connection in series with the main power supply circuit and operable at a predetermined temperature to interrupt the main power supply circuit; and a second set of electrical tabs connected to the electrical adapter component separately from the first set of electrical tabs for electrical connection to one or more auxiliary components of the liquid heating appliance to form a bypass power supply circuit.

[0010] Thus, it will be appreciated that the present application provides a liquid heating appliance comprising a control unit comprising two separate sets of electrical tabs connected to the same electrical adapter component. In some embodiments, the first set of electrical tabs is connected (e.g. directly or indirectly) to the electrical heater to form a main power supply circuit which can be interrupted by operation of the thermomechanical actuator at a predetermined temperature (e.g. corresponding to a desired temperature or state of the liquid in the liquid heating vessel, such as boiling). In some embodiments, the second set of electrical tabs is connected to one or more auxiliary components in a bypass power supply circuit. Since the second set of electrical tabs is connected to the electrical adapter component separately from the first set of electrical tabs, the bypass power supply circuit can receive the electrical power supply independently of the main power supply circuit. The bypass power supply circuit can be connected in parallel with the main power supply circuit. Thus, it will be appreciated that this operation of the thermomechanical actuator at the predetermined temperature does not interrupt the bypass power supply circuit, meaning that electrical power can be provided to the one or more auxiliary components connected to the bypass power supply circuit even after the thermomechanical actuator has disconnected the electrical heater from the electrical power supply.

[0011] This means that the liquid heating appliance can provide the functionality of an electronically controlled kettle, but without necessarily requiring expensive electronic components and complex manufacture.

[0012] The liquid heating appliance preferably comprises a vessel spout arranged in fluid communication with the liquid heating vessel to allow dispensing of the contents of the liquid heating vessel. The appliance can comprise a lid arranged to close an aperture for filling the liquid heating vessel with liquid to be heated. In some embodiments, the liquid heating appliance comprises a handle for lifting the liquid heating appliance.

[0013] In some embodiments, the electric heater comprises an electric heating element, preferably a sheathed electric heating element. The electric heating element can be of conventional "horse-shoe" construction with electrical terminals at one end. The electric heater can comprise a heat spreader. The electric heating element can be mounted on the underside of the heat spreader. Preferably, the electric heating element is arranged in thermal communication with the heat spreader. The heat spreader is preferably arranged to heat the contents of the liquid heating vessel. The electric heater (e.g. comprising the heat spreader) can be arranged in or beneath the base of the liquid heating vessel.

[0014] Preferably, the thermomechanical actuator comprises a switch operable to interrupt the mains power circuit. The control unit can comprise a trip lever for allowing a user to manually operate the switch. Preferably, the switch is arranged to control the supply of electrical power from the electrical adapter component to the electric heater. The switch can comprise a moveable electrical contact mounted on the moveable member. Preferably, the switch comprises a fixed electrical contact in the mains power circuit. Preferably, the moveable electrical contact is arranged to cooperate with the fixed electrical contact to allow the supply of electrical power to the electric heater via the mains power circuit when the moveable member is in the closed position.

[0015] Preferably, at the predetermined temperature, the thermomechanical actuator is configured to move the moveable member from the closed position to an open position in which the moveable electrical contact is separated from the electrical contact to interrupt the mains power circuit.

[0016] The thermomechanical actuator can be operable at a predetermined temperature associated with a change of state (e.g. boiling) of the liquid within the liquid heating vessel. Preferably, the thermomechanical actuator is operable at a predetermined temperature of less than 100°C, for example about 95°C. Preferably, the thermomechanical actuator is operable at a predetermined temperature which is the steam sensing temperature. It will therefore be appreciated that the thermomechanical actuator is not operable to detect overheating of the electric heater.

[0017] Preferably, the thermomechanical actuator is arranged to detect steam generated in the liquid heating vessel. In some embodiments, the appliance comprises a steam tube arranged to direct steam generated in the vessel to the thermomechanical actuator in the control unit.

[0018] The control unit can also comprise means for detecting an overheating condition within the liquid heating appliance (e.g. by detecting an over-temperature of the heat spreader or electric heater during a "dry boil" condition). The means can comprise a temperature sensor or a thermally sensitive actuator, for example a second thermomechanical actuator in series with the mains power circuit.

[0019] The means for detecting an overheating condition within the liquid heating appliance is preferably arranged in thermal communication (e.g. directly) with the heat spreader or electric heater.

[0020] Preferably, the (first) thermomechanical actuator is separate from the means for detecting an overheat condition within the liquid heating appliance. The (first) thermomechanical actuator is preferably not arranged in (direct) thermal communication with the heat spreading plate or the electric heater. The (first) thermomechanical actuator is preferably configured to operate at a predetermined temperature during normal operation of the appliance. However, the means for detecting an overheat condition is preferably configured to operate only as a safety mechanism and not during normal operation of the appliance. Preferably, the means for detecting an overheat condition is configured to operate at a temperature greater than the predetermined temperature at which the (first) thermomechanical actuator is operable to interrupt the main power supply circuit. Preferably, the means for detecting an overheat condition is configured to operate at a temperature above 100°C.

[0021] The control unit itself is considered to be novel and inventive. Thus, when viewed from a second aspect, the present application provides a control unit for a liquid heating appliance, the control unit comprising: an electrical adapter component for receiving an electrical power supply; a first set of electrical tabs connected to the electrical adapter component for electrical connection to an electric heater to form a main power supply circuit; a thermomechanical actuator for connection in series with the main power supply circuit and operable at a predetermined temperature to interrupt the main power supply circuit; and a second set of electrical tabs connected to the electrical adapter component separately from the first set of electrical tabs for electrical connection to one or more auxiliary components to form a bypass power supply circuit.

[0022] In embodiments of any of the aspects disclosed herein, the electrical adapter component can be a cordless electrical adapter component. In some embodiments, the cordless electrical adapter component is arranged to mate with a corresponding base electrical connector component. The cordless electrical adapter component and the corresponding base electrical connector component can be of a type that can mate regardless of their relative angular orientation, or at least over a wide angular range (e.g. at least 340°, preferably up to 360°). Suitable cordless connectors of this “360° type” are described in WO95 / 08024 and WO01 / 28294, and are available as Strix P72 or P76 connector components.

[0023] In some embodiments, the liquid heating appliance comprises a base electrical connector part. The base electrical connector part can comprise prongs for electrical connection to a mains power cable, or the mains power cable can be integrated with the connector part. In embodiments where the control unit comprises a cordless electrical adapter part, the base electrical connector part can be mounted in a power base station for the liquid heating appliance (i.e. for a cordless appliance that is removably seated on the power base station). Preferably, the base electrical connector part is not included in the electronic control unit in the power base station. As the control unit in the cordless appliance provides a separate electrical connection to the bypass power circuit, this bypass power circuit can be used to power the electronic control parts in the appliance, rather than relying on the electronic controller in the base station (e.g. as shown in WO01 / 28294).

[0024] The (e.g. cordless) electrical adapter part can comprise at least two mating conductors for connection to the live and neutral poles of the base electrical connector part. Thus, preferably, the electrical adapter part comprises a neutral electrical contact and a live electrical contact. There can be an additional ground connection. In some embodiments, the electrical adapter part is a three-pole conductor part (e.g. for mating with a Strix P72 connector). In other embodiments, the electrical connector part is a 5-pole conductor part (e.g. for mating with a Strix P76 connector). Such a 5-pole connector provides an electrical power connection as well as an electronic signal connection.

[0025] The neutral electrical contact and / or the live electrical contact can comprise (respective) ring contacts. The ring contacts can be arranged to be received within (respective) ring apertures in the base electrical connector part.

[0026] In some embodiments, a first electrical tab in the first set of electrical tabs is connected to the neutral electrical contact of the electrical adapter part. A second electrical tab in the first set of electrical tabs is preferably connected to the live electrical contact of the electrical adapter part.

[0027] In some embodiments, a first electrical tab in the first set of electrical tabs is connected to the neutral electrical contact via a switch that is operable by a thermal-mechanical actuator to interrupt the main power circuit. In some embodiments, a second electrical tab in the first set of electrical tabs is connected to the live electrical contact via the switch.

[0028] The electrical heater is preferably connected between a first electrical tab in the first set of electrical tabs and a second electrical tab in the first set of electrical tabs.

[0029] Preferably, the first set of electrical tabs and / or the second set of electrical tabs are quick-disconnect connectors, such as FASTON® connectors. TMconnector. This can help reduce the complexity of the process of manufacturing the liquid heating appliance, which can also reduce the costs associated with the manufacturing. In some embodiments, the first set of electrical tabs are directly attached (e.g. welded) to the electrical terminals of the heating element.

[0030] In some embodiments, the first set of electrical tabs have a different shape than the second set of electrical tabs.

[0031] Preferably, the thermomechanical actuator is arranged to detect a temperature representative of the temperature within the liquid heating vessel. The thermomechanical actuator can be arranged to detect vapour generated in the liquid heating vessel. For example, the control unit can comprise means for directing vapour received from the liquid heating vessel.

[0032] The thermomechanical actuator can comprise a bimetallic actuator, preferably a snap-action bimetallic actuator. Where the thermomechanical actuator comprises a switch operable to interrupt the main power circuit, the switch can be operated by the action of the bimetallic actuator. In some embodiments, the thermomechanical actuator can also be arranged to operate a trip lever of the control unit (e.g. directly or indirectly) at a predetermined temperature.

[0033] In some embodiments, a first electrical tab of the second set of electrical tabs is connected to a neutral electrical contact of the electrical adapter component. A second electrical tab of the second set of electrical tabs can be connected to a live electrical contact of the electrical adapter component.

[0034] In some embodiments, the neutral electrical contact of the electrical adapter component is connected to a first electrical tab of the first set of electrical tabs and to a first electrical tab of the second set of electrical tabs. The live electrical contact of the electrical adapter component can be connected to a second electrical tab of the first set of electrical tabs and to a second electrical tab of the second set of electrical tabs. It will therefore be appreciated that the main power circuit and the bypass power circuit can be connected to the electrical adapter component via the same electrical contacts of the electrical adapter component.

[0035] When viewed from a further aspect, the present invention provides a control unit for a liquid heating appliance, the control unit comprising: an electrical adapter component for receiving an electrical power supply, the electrical adapter component comprising a neutral electrical contact and a live electrical contact; a first set of electrical tabs connected to the electrical adapter component for electrical connection to an electrical heater to form a main power circuit; a thermomechanical actuator for connection in series with the main power circuit and operable at a predetermined temperature to interrupt the main power circuit; and a second set of electrical tabs connected to the electrical adapter component separately from the first set of electrical tabs for electrical connection to one or more auxiliary components to form a bypass power circuit; wherein: a first electrical tab of the first set of electrical tabs is connected to the neutral electrical contact of the electrical adapter component, a second electrical tab of the first set of electrical tabs is connected to the live electrical contact of the electrical adapter component; and a first electrical tab of the second set of electrical tabs is connected to the neutral electrical contact of the electrical adapter component, and a second electrical tab of the second set of electrical tabs is connected to the live electrical contact of the electrical adapter component.

[0036] When viewed from a further aspect, the present invention provides a liquid heating appliance comprising: a liquid heating vessel; an electrical heater for heating liquid contained within the liquid heating vessel; and a control unit, the control unit comprising: an electrical adapter component for receiving an electrical power supply, the electrical adapter component comprising a neutral electrical contact and a live electrical contact; a first set of electrical tabs connected to the electrical adapter component for electrical connection to the electrical heater to form a main power circuit; a thermomechanical actuator for connection in series with the main power circuit and operable at a predetermined temperature to interrupt the main power circuit; and a second set of electrical tabs connected to the electrical adapter component separately from the first set of electrical tabs for electrical connection to one or more auxiliary components of the liquid heating appliance to form a bypass power circuit; wherein: a first electrical tab of the first set of electrical tabs is connected to the neutral electrical contact of the electrical adapter component, and a second electrical tab of the first set of electrical tabs is connected to the live electrical contact of the electrical adapter component; and a first electrical tab of the second set of electrical tabs is connected to the neutral electrical contact of the electrical adapter component, and a second electrical tab of the second set of electrical tabs is connected to the live electrical contact of the electrical adapter component.

[0037] In some embodiments, the liquid heating appliance comprises one or more auxiliary components, for example connected to the second set of electrical tabs to form the bypass power circuit. At least one of the auxiliary components can be an electronic component. In various embodiments, the liquid heating appliance comprises one or more auxiliary components connected to the second set of electrical tabs to form the bypass power circuit, wherein the one or more auxiliary components comprise one or more of a processor, a control circuit, an electronic temperature sensor, a secondary electrical heater, a user interface, an electronic display, a light source, a wireless transceiver, a weight sensor, a fill (e.g. liquid level) sensor and / or a rechargeable power source.

[0038] In some embodiments, the one or more auxiliary components comprise a control circuit. The control circuit can comprise logic and optionally a processor. In some embodiments, the one or more auxiliary components comprise a processor. The one or more auxiliary components can comprise a memory storing software containing instructions for execution by the processor. The processor is preferably configured to control the operation of one or more of the other auxiliary components. In some embodiments, the one or more auxiliary components preferably comprise a rechargeable power source connected to the processor. This can allow the processor to continue to control the one or more auxiliary components after the main power circuit has been interrupted upon disconnection of the appliance from the power base station.

[0039] The one or more auxiliary components can comprise an electronic temperature sensor (e.g. a thermistor), for example arranged to (directly or indirectly) measure the temperature of the liquid within the liquid heating vessel. Preferably, the electronic temperature sensor is configured to send a measurement signal to the processor indicative of the temperature of the liquid within the liquid heating vessel. Thus, the bypass power circuit can comprise the electronic temperature sensor connected to the processor.

[0040] In some embodiments, the one or more auxiliary components comprise a processor and an electronic temperature sensor, wherein the processor is arranged to control one or more of the other auxiliary components based on signals received from the electronic temperature sensor. As mentioned above, the one or more auxiliary components preferably comprise a rechargeable power source connected to the processor. This can allow the processor to continue to control the one or more other auxiliary components after the main power circuit has been interrupted upon disconnection of the appliance from the power base station.

[0041] In some embodiments, the one or more auxiliary components preferably comprise an electronic temperature sensor and an electronic display configured to display a temperature value measured by the electronic temperature sensor. For example, the electronic display can be configured to display the current temperature of the liquid in the liquid heating vessel as it cools down after a boiling operation. This can be advantageous in deterring the user from re-boiling the liquid when not necessary, thereby helping to reduce the negative impact of the device on the environment.

[0042] In some embodiments, the one or more auxiliary components comprise a secondary electric heater. The secondary electric heater preferably has a lower power output than the primary electric heater, for example a “keep warm” heater. In some embodiments, a first set of electrical tabs are connected to the (primary) electric heater to form the main power circuit, and a second set of electrical tabs are connected to the secondary (e.g. lower power) electric heater.

[0043] The secondary electric heater can be configured to maintain the temperature of the liquid within the liquid heating vessel. The liquid heating appliance can comprise a switch arranged to control the supply of electrical power from the bypass power supply circuit to the secondary electric heater. The operation of the switch is preferably controlled by the processor. The processor can be configured to control the switch in dependence on a measurement signal received from the electronic temperature sensor. The switch can comprise a relay or a triac. The processor can be configured to control the switch in dependence on a value of a timer, for example to limit the length of time for which the "keep warm" operation of the appliance is active.

[0044] The processor can be configured to cycle the secondary electric heater on and off in order to maintain the temperature of the liquid within the liquid heating vessel. The temperature to be maintained can be a predetermined temperature, or can be a temperature selected by a user of the liquid heating appliance. The processor can be configured to cycle the secondary electric heater on and off in response to a measurement signal received from the electronic temperature sensor.

[0045] In some embodiments, the one or more auxiliary components comprise a secondary electric heater arranged to heat the liquid contained within the liquid heating vessel, a user interface configured to receive a user input of a target temperature, and a processor arranged to control the secondary electric heater to heat the liquid contained within the liquid heating vessel to the target temperature. In some embodiments, the processor can determine a heating time required to reach the target temperature. In some embodiments, the processor can control the secondary electric heater based on a signal received from the electronic temperature sensor. This can provide an additional heating function for the liquid heating appliance, even after the primary power supply circuit to the primary electric heater has been interrupted by operation of the thermomechanical actuator. This additional heating function can be used immediately after the primary electric heater (e.g. to raise the temperature of the liquid to the target temperature), or at a later time (e.g. to reheat to the target temperature).

[0046] In some embodiments, the one or more auxiliary components comprise a display, preferably an electronic display. In some embodiments, the electronic display is configured to display a countdown indicating the time remaining until the liquid contained within the liquid heating vessel reaches a target temperature. The target temperature can be pre-set or can be input by a user (e.g. at a user interface as described above). In some embodiments, the processor is configured to automatically switch off the secondary electric heater after a predetermined time, and the user interface comprises an electronic display configured to display a countdown indicating the time remaining until the processor is to automatically switch off the secondary electric heater.

[0047] In some embodiments, the electronic display is configured to display a volume indicium representing the volume of liquid contained within the liquid heating vessel. This can inform a user of the current amount of liquid, so that only the required volume (e.g. a cup) is heated.

[0048] In some embodiments, the one or more auxiliary components comprise a light source, or the appliance otherwise comprises a light source connected to the bypass power circuit. In some embodiments, the one or more auxiliary components comprise control circuitry (optionally comprising a processor) arranged to control the light source. The light source can comprise a light emitting diode (LED) or a plurality of LEDs. The light source is preferably configured to output a plurality of different colours of light. Preferably, the colour of light output by the light source is controlled by the processor. The processor can be configured to set the colour of light output by the light source in dependence on a parameter or a measured value. For example, the processor can be configured to change the colour of the light source (e.g. from blue to red) during heating as the temperature of the liquid within the liquid heating vessel increases, for example based on a temperature value measured by an electronic temperature sensor as described above.

[0049] In some embodiments, the light source is arranged to project light onto a surface on which the appliance is located in use. For example, the light source can be arranged to direct light onto the surface of a countertop on which the appliance is placed. In some embodiments, the light source is arranged on a handle of the liquid heating appliance.

[0050] In some embodiments, the handle comprises a first portion extending substantially horizontally away from the appliance and a second portion extending from the first portion in a substantially vertical direction towards the base of the appliance. As will be appreciated by the skilled person, the first and second portions effectively form an inverted "L" shape, the second portion of which can be gripped by a user. The light source can be arranged on the underside (e.g. the trailing end) of the second portion of the handle. This arrangement can help to ensure that light emitted by the light source is projected onto a surface on which the liquid heating appliance is placed. It can also help to avoid the light source being obscured by a user's hand as the user is lifting the liquid heating appliance, thereby helping to ensure that light emitted by the light source remains visible to the user.

[0051] In some embodiments, the one or more auxiliary components comprise a user interface. The user interface can be arranged on a side wall of the liquid heating vessel. The user interface preferably comprises input means for operation by a user of the appliance. The input means can comprise one or more of a button, a dial, a touchscreen, or any other suitable or desired means. The user interface can comprise a display, preferably an electronic display. The electronic display can comprise an LCD or LED (e.g. OLED) display. The electronic display can comprise an electronic display screen. The electronic display screen can comprise a touchscreen display screen, for example a resistive or capacitive display screen. This can allow a user to interact with auxiliary components of the appliance, such as the processor, in order to control operation of the appliance.

[0052] In some embodiments, the display is configured to display a current temperature indicative of the temperature of the liquid within the liquid heating vessel (e.g. based on the temperature values measured by the electronic temperature sensor as described above). In some embodiments, the display is configured to display a timer indicating an estimated time remaining until a target temperature of the liquid within the liquid heating vessel is reached. Preferably, the target temperature is selectable by the user via the user interface. The processor is preferably configured to determine said estimate, for example using the measurements obtained by the electronic temperature sensor. In some embodiments, the display is configured to display the target temperature selected by the user. In some embodiments, the display is configured to display the elapsed or remaining time of the timer, for example a keep-warm timer. In some embodiments, the display is configured to display the time since the liquid within the liquid heating vessel last reached boiling. This can help reduce the likelihood of the user unnecessarily repeating a boiling operation shortly after boiling has occurred (e.g. because they are unaware that boiling was completed shortly before). In some embodiments, the display is configured to display an estimated volume of liquid present within the liquid heating vessel.

[0053] In some embodiments, the display and / or light source is configured to display one or more alerts to the user. The display or light source can be configured to display an alert notifying the user that a descaling operation is required. This can help reduce the negative impact of the device on the environment, as the user can be encouraged to descale the kettle regularly, which can improve the efficiency of the appliance. The display or light source can be configured to display an alert notifying the user that the total volume of liquid within the liquid heating vessel is less than a threshold volume. This helps reduce the risk of a "dry boil" situation, in which the appliance can be damaged or become a safety hazard due to the electric heating element being energised when the liquid heating vessel is empty.

[0054] The display or light source can be configured to display usage data to the user. For example, the display can be configured to display feedback to the user focussing on the environment, for example relating to the user's historical operation of the appliance. This helps "gamify" the use of the appliance, while educating the user in environmentally friendly and efficient usage practices.

[0055] In some embodiments, the one or more auxiliary components comprise a wireless transceiver (e.g. a radio transceiver) for transmitting and receiving data. The display can be configured to display data received by the wireless transceiver.

[0056] In some embodiments, the one or more auxiliary components comprise an electronic display and a wireless transceiver for receiving data, wherein the electronic display is configured to display data received by the wireless transceiver. For example, the display can be configured to display weather information received by the wireless transceiver to the user via the electronic display. The display can be configured to display email, calendar, time / date, instant messaging or news data received by the wireless transceiver.

[0057] In some embodiments, the one or more auxiliary components comprise an electronic temperature sensor and a wireless transceiver for transmitting data obtained by the electronic temperature sensor. For example, the wireless transceiver can be configured to send usage data measured by the electronic temperature sensor to a remote device or server for processing. The wireless transceiver can be configured to receive the processed usage data. As mentioned above, the appliance can comprise an electronic display screen configured to display such data to a user, for example in the form of feedback focussed on a concern.

[0058] In some embodiments, the one or more auxiliary components comprise a processor and a wireless transceiver for receiving control signals for operation of the processor from a remote user. For example, the wireless transceiver can be configured to receive control signals from a personal mobile device of a user, which are sent to the processor so that one or more of the other auxiliary components (e.g. a secondary heater) can be controlled in response to the control signals of the user.

[0059] In some embodiments, the one or more auxiliary components comprise a sensor for detecting the amount of liquid in the liquid heating vessel. The sensor can comprise a weight sensor for detecting the weight of liquid in the liquid heating vessel. The sensor can comprise a fill level sensor for detecting the volume of liquid in the liquid heating vessel. Preferably, the one or more auxiliary components comprise a control circuit and a sensor for detecting the amount of liquid in the liquid heating vessel. Preferably, the control circuit is configured to: determine, using the sensor, a first amount of liquid within the liquid heating vessel when the appliance is located on the power base station; detect when the appliance has been removed from the power base station and subsequently replaced on the power base station; and determine, using the sensor, a second amount of liquid within the liquid heating vessel after the detection. Preferably, the control circuit is configured to determine whether the difference between the first amount of liquid and the second amount of liquid is less than a threshold value. Preferably, the control circuit is configured to, in response to determining that the difference is less than the threshold value, send a signal to trigger a user alert device arranged to alert a user of the liquid heating appliance that an overfill has occurred. Preferably, the control circuit is configured to use the sensor to detect when the appliance has been removed from the power base station and subsequently replaced on the power base station.

[0060] It will be appreciated that the liquid heating appliance can (alternatively or additionally) comprise any of the auxiliary components described herein as part of the primary power supply circuit. However, in preferred embodiments, all of the auxiliary components are connected to the bypass power supply circuit. This allows the auxiliary components to continue to function after the primary power supply circuit has been interrupted by operation of the thermomechanical actuator.

[0061] In various embodiments, which can be combined with any of the above described embodiments, the one or more auxiliary components comprise a rechargeable power source. The rechargeable power source can comprise a rechargeable battery. The rechargeable power source can comprise a capacitive power source. Preferably, the rechargeable power source is arranged to provide power to other of the one or more auxiliary components after the electrical adapter component has been disconnected from the base connector component (e.g. when the cordless liquid heating appliance is lifted off the power base station). Preferably, the rechargeable power source is arranged to be charged via the bypass power circuit while the electrical adapter component is connected to the base electrical connector component.

[0062] This in itself is considered to be novel and inventive. Thus, when viewed from a third aspect, the present application provides a liquid heating appliance comprising: a liquid heating vessel; an electrical heater for heating liquid contained in the liquid heating vessel; a main power circuit; a control unit, the control unit comprising: an electrical adapter component for receiving a supply of electrical power, wherein the electrical adapter component is electrically connected to the electrical heater via the main power circuit; and a thermomechanical actuator connected in series with the main power circuit and operable at a predetermined temperature to interrupt the main power circuit; a bypass power circuit arranged in parallel with the main power circuit such that operation of the thermomechanical actuator at the predetermined temperature does not interrupt the bypass power circuit; and a rechargeable power source electrically connected to the electrical adapter component via the bypass power circuit.

[0063] Thus, this aspect of the present application provides a liquid heating appliance comprising a rechargeable power source arranged within a bypass power circuit of the appliance. Providing a rechargeable power source within the bypass power circuit allows other electrical components connected to the bypass power circuit to receive power even after the electrical adapter component has ceased to receive a supply of electrical power. This can occur when the appliance is disconnected from a mains electricity supply, for example when a user lifts a cordless appliance off a power base station.

[0064] As described above, one or more auxiliary components can be connected to the bypass power circuit to allow the liquid heating appliance to perform additional functions. Thus, this aspect of the present application provides a liquid heating appliance which is able to provide auxiliary electronic features that are typically reserved for fully electronic kettles without the need to provide complex electronic components to control operation of the electrical heater.

[0065] For example, providing a rechargeable power source allows the electronic display of the liquid heating appliance to show an estimated amount of water present in the liquid heating container, even when the power adapter is not connected to a power source. It should be understood that this allows the user to use the electronic display to determine the liquid level in the liquid heating container while filling it (e.g., from a tap), which typically requires removing the liquid heating appliance from its power base.

[0066] Any of the above embodiments can utilize a rechargeable power supply in a bypass power circuit to power other auxiliary components connected to the bypass power circuit. In some embodiments, the liquid heating appliance includes an electronic temperature sensor and a processor connected to the rechargeable power supply, wherein the processor is arranged to control one or more auxiliary components based on signals received from the electronic temperature sensor. In some embodiments, the liquid heating appliance includes: a secondary electric heater connected to the rechargeable power supply and arranged to heat a liquid contained within the liquid heating container; a user interface connected to the rechargeable power supply and configured to receive user input of a target temperature; and a processor connected to the rechargeable power supply and arranged to control the secondary electric heater to heat the liquid contained within the liquid heating container to the target temperature.

[0067] In various embodiments that can be combined with any of the above embodiments, one or more auxiliary components include an electronic temperature sensor (e.g., a thermistor) and a display assembly, the electronic temperature sensor being arranged to detect the temperature of a liquid within the container, and the display assembly being configured to indicate the detected liquid temperature to the user of the appliance. For example, the display assembly could be used to indicate that the liquid temperature has reached boiling point.

[0068] From another perspective, a liquid heating appliance is provided, comprising: Liquid heating containers; An electric heater for heating the liquid contained within the liquid heating container; and Control unit, the control unit includes: An electrical adapter component used to receive power supply; The first set of electrical tabs is connected to the electrical adapter component for electrical connection to the electric heater to form a main power circuit including a set of switch contacts; A bimetallic actuator, operable at a predetermined temperature, to interrupt the main power circuit by opening the set of switch contacts; and The second set of electrical tabs, separately connected to the electrical adapter component from the first set of electrical tabs, is used to electrically connect to one or more auxiliary components of the liquid heating appliance to form a bypass power circuit.

[0069] It is understood that any aspect described herein may (and preferably does) include one or more (e.g., all) of the optional and preferred features outlined herein. Attached Figure Description

[0070] Some preferred embodiments of the invention will now be described by way of example only with reference to the accompanying drawings, in which: Figure 1 A perspective view of a liquid heater according to an embodiment of the present invention is shown; Figure 2 Showing Figure 1 An exploded view of the heating device of the appliance; Figure 3 Showing Figure 1 A perspective view of the control unit of a liquid heating appliance; Figure 4 Showing Figure 1 A schematic diagram of the power supply circuit for a liquid heater; Figure 5 A side view of a liquid heating appliance according to another embodiment of the present invention is shown; Figure 6 Showing Figure 5 A side view of the liquid heating appliance operating in another display mode; Figure 7 Showing Figure 5 A side view of the liquid heating appliance operating in another display mode; Figure 8 Showing Figure 5 A side view of the liquid heating appliance operating in another display mode; Figure 9 Showing Figure 5 A side view of the liquid heating appliance operating in another display mode; Figure 10 A side view of a liquid heater according to another embodiment of the present invention is shown; and Figure 11 Showing Figure 10 A side view of the liquid heating appliance in operation in another display mode. Detailed Implementation

[0071] Figure 1 A perspective view of a liquid heating appliance 2 (hereinafter referred to as appliance 2) according to an embodiment of the present invention is shown. Appliance 2 includes a liquid heating container 4, a container spout 6, and a handle 8. The top of appliance 2 is closed with a cover 10. Appliance 2 is arranged to rest on a power base 12, which has a centrally located 360-degree base electrical connector component 14 for supplying power to the appliance.

[0072] Appliance 2 also includes an electric heater ( Figure 1 (Not shown in the image) for heating a certain volume of liquid contained within a liquid heating container 4. The heater includes an electric heating element mounted on the bottom surface of a heat diffuser plate. The heating element is arranged to be in thermal communication with the base 23 of the liquid heating container 4 via the heat diffuser plate when electrical energy is supplied to the heater, thereby heating the contents of the liquid heating container 4.

[0073] Control unit ( Figure 1 (Not shown in the image) is also mounted on the bottom surface of the heat diffusion plate and controls the power supply from the power base 12 to the electric heater, as described in more detail below.

[0074] Figure 2 Showing Figure 1 An exploded view of the heating device of appliance 2, which includes an electric heater 18, a control unit 16, and the base 23 of the liquid heating container 4 of appliance 2. For clarity, other components of appliance 2 have been removed. The control unit 16 and the heater 18 are both mounted below the base 23 of the liquid heating container 4.

[0075] The control unit 16 is arranged to receive the base electrical connector component 14 of the power base 12 and to control the power supply from the power base 12 to the electric heater 18. The heater 18 includes a sheathed electric heating element 18a and a circular heat diffuser plate 18b. The heating element 18a has a conventional "horseshoe" structure with an electrical terminal 19 at either end. The heating element 18a extends substantially around the circumference of the bottom surface of the diffuser plate 18b. The control unit 16 is arranged to be mounted at the center of the bottom surface of the diffuser plate 18b.

[0076] Figure 3 Showing Figure 2 The bottom perspective view of the control unit 16 shown.

[0077] The control unit 16 includes a molded plastic body 26, on the bottom side of which a cordless power adapter component 28 is formed. The cordless power adapter component 28 is a three-pole conductor component including a ground pin 28a, a charged ring 28b, and a neutral ring 28c. The charged ring 28b and the neutral ring 28c are arranged concentrically around the central ground pin 28a. A base electrical connector ( Figure 3 (Not shown in the image) includes a central hole for receiving the ground pin 28a and a coaxial annular hole for receiving both the charged ring 28b and the neutral ring 28c.

[0078] Electrical contacts housed in the center hole and coaxial hole respectively contact the live ring 28b and the neutral ring 28c to connect the live and neutral poles of the power supply circuit when the connector parts / adapter parts 14, 28 are combined.

[0079] The control unit 16 includes a first pair of fixed electrical tabs 29a and 29b, which are electrically connected to the cordless adapter component 28. The neutral tab 29a is connected to the neutral ring 28c, and the charged tab 29b is connected to the charged ring 28b. The two tabs 29a and 29b are connected via a switch ( Figure 3 (Not shown) is connected to the corresponding contact of the cordless power adapter component 28. Each of the first pair of fixed electrical tabs 29a, 29b is also connected via a flying wire (not shown) to the corresponding electrical terminal 19 of the heating element 18a.

[0080] The control unit 16 also includes a thermomechanical actuator 31 supported by a molded plastic control body 26. The thermomechanical actuator 31 is a fast-acting bimetallic actuator configured to operate at a predetermined temperature. In use, when the control unit 16 is installed within the appliance 2, the thermomechanical actuator 31 is arranged to detect the temperature of steam generated by boiling water within the liquid heating container 4, for example via a steam passage extending from the top of the container 4 to the control unit 16 through a steam delivery pipe, as is known in the art.

[0081] The control unit 16 includes a trip lever 36 pivotally mounted on the control body 26. The distal end of the trip lever 36 is arranged to contact a thermomechanical actuator 31, while the proximal end of the trip lever 36 is arranged to operate a switch. Figure 3 (Not shown in the image), the switch connects the first pair of fixed electrical tabs 29a, 29b to the cordless power adapter component 28.

[0082] The thermomechanical actuator 31 is arranged such that its operation at a predetermined temperature causes the trip lever 36 to pivot, thereby disconnecting the switch and interrupting the electrical supply to the first pair of fixed electrical tabs 29a, 29b, and thus to the heater 18. This allows the heater 18 to be shut off when the thermomechanical actuator 31 detects that the water in the liquid heating container 4 has reached a boiling temperature. The trip lever 36 can also be manually operated to open and close the switch.

[0083] The control unit 16 also includes a second pair of fixed electrical tabs 33a, 33b. Neutral tab 33a is directly connected to neutral ring 28c, and charged tab 33b is directly connected to charged ring 28b. In contrast to the first pair of fixed electrical tabs 29a, 29b, none of the second pair of tabs 33a, 33b is connected to the cordless adapter component 28 via a switch. This means that even after the thermomechanical actuator 31 has been operated to disconnect the heater 18, the second pair of fixed electrical tabs 33a, 33b continues to receive power from the base electrical connector component via the cordless adapter component 28.

[0084] Each of the second pair of fixed electrical tabs 33a and 33b can be further connected to an auxiliary component module (such as...) via a flying wire (not shown). Figure 4As shown), this provides a bypass power supply circuit for supplying power to the auxiliary component module.

[0085] Figure 4 Showing Figure 1 A schematic diagram of the power supply circuit of appliance 2. Appliance 2 includes a main power supply circuit 60 (in... Figure 4 (represented by dashed lines) and auxiliary power supply circuit 62 (represented by solid lines).

[0086] As described above, the control unit 16 of the appliance 2 includes a cordless power adapter component 28, which can be connected to a corresponding base electrical connector component 14 when the appliance 2 is placed on the power base platform 12. Figure 4 When the base electrical connector component (not shown) is in use, it supplies AC (alternating current) to the electrical components of the appliance 2. The control unit 16 also includes a pair of switches 64a, 64b and a first pair of fixed electrical tabs 29a, 29b. Each tab 29a, 29b is connected to the cordless adapter component 28 via a corresponding one of the switches 64a, 64b.

[0087] The electric heating element 18a is connected to both ends of the first pair of protrusions 29a and 29b, thereby completing the main power supply circuit 60.

[0088] The thermomechanical actuator 31 is arranged to disconnect switches 64a, 64b when a predetermined temperature is sensed. This causes the electric heating element 18a to disconnect from the power supply provided by the base electrical connector component 14, thereby turning off the heating element 18a.

[0089] The control unit 16 also includes a second pair of fixed electrical tabs 33a, 33b, each tab being connected to the cordless adapter component 28. Unlike the first pair of fixed electrical tabs 29a, 29b, each of the second pair of fixed electrical tabs 33a, 33b is directly connected to the cordless adapter component 28, rather than via a switch.

[0090] The auxiliary component module 70 is connected to both ends of the second pair of fixed electrical tabs 33a and 33b, thereby completing the auxiliary power circuit 62 connected in parallel with the main power circuit 60.

[0091] Due to the above arrangement, when the thermomechanical actuator 31 operates to disconnect switches 64a and 64b, thereby disconnecting the electric heating element 18a from the power supply provided by the base electrical connector component 14, the power supply to the auxiliary power circuit 62 is not interrupted.

[0092] In this example, the auxiliary component module 70 includes a low-cost power supply 72 directly connected to the second pair of fixed electrical tabs 33a, 33b. The low-cost power supply 72 is arranged to store electrical energy received from the power supply of the base electrical connector component 14 when the appliance 2 is placed on the power base 12. This means that even after the appliance 2 has been lifted off the power base 12, causing the cordless adapter component 28 and the base electrical connector component 14 to be no longer connected, the low-cost power supply 72 can still provide power to other components of the auxiliary component module 70. Therefore, the appliance 2 can be equipped with electrical components that continue to operate even after the appliance 2 has been removed from the power base 12, as will be described in more detail below.

[0093] The auxiliary component module 70 also includes a processor 74, a low-power electronic display 76, a light-emitting diode (LED) 77, and a thermistor 78, each of which is arranged to receive power from a low-cost power supply 72. Although the components of the auxiliary component module 70 are... Figure 4 The components are grouped together in the diagram shown, but they are not necessarily physically adjacent to each other in appliance 2.

[0094] An electronic display 76 is arranged on the side of the liquid heating container 4 of the appliance 2, between the handle 8 and the container spout 6. An LED 77 is arranged at the end of the handle 8 to project light vertically downwards, for example toward a surface on which the appliance 2 has been placed. The LED 77 on the handle allows information about the status of the appliance 2 to be provided to the user from a greater distance or when the display 76 is turned away from the user.

[0095] The auxiliary component module 70 also includes a "heat-insulating" (i.e., low-power) electric heating element 80, which is connected to a second pair of fixed electrical tabs 33a, 33b via a bidirectional thyristor 82 controllable by the processor 74. The heat-insulating electric heating element 80 is arranged in the appliance 2 adjacent to the base 23 of the liquid heating container 4, such that when the heating element 80 is powered, the heat generated by the heating element 80 is used to heat the contents of the liquid heating container 4. A thermistor 78 is arranged in the appliance 2 to detect the temperature of the contents of the liquid heating container 4.

[0096] The processor 74 is configured to receive temperature measurements from the thermistor 78 and operate the bidirectional thyristor 82 during the "heat preservation" operation mode of the appliance 2 to cyclically turn the heat preservation heating element 80 on or off in order to maintain the contents of the container 4 at a substantially constant desired temperature.

[0097] Now refer to Figures 5 to 11 Describes some preferred uses of the components of the auxiliary component module 70.

[0098] Figure 5An appliance 102 according to another embodiment of the present invention is shown. Appliance 102 is substantially the same as... Figure 1 The appliance 102 is identical to the one in the previous model; module 70 includes a user interface 175, which includes an electronic display 176, a power button 181, a keep-warm selection button 183, and a temperature selection button 185. The user interface 175 is located on the side wall of the liquid heating container 104 of the appliance 102, between the handle 108 and the container spout 106. The electronic display 176 is an LED display located beneath a transparent portion of the wall of the liquid heating container 104. The appliance 102 also includes an LED 177, which is located on the bottom surface of the tail end of the handle 108 of the appliance 102.

[0099] After turning on appliance 102 using power button 181, the user of appliance 102 can select the desired temperature to which the liquid in container 104 will be heated. This selection is made by pressing temperature selection button 183 until the desired target temperature is displayed on display 176. Figure 5 As shown.

[0100] The selected temperature is achieved by the user pressing the power button 181 again. The display 176 is then configured to show a countdown indicating the remaining time until the liquid in the liquid heating container 104 reaches the selected temperature, such as... Figure 6 As shown.

[0101] The display 176 can also display the current temperature of the liquid within the liquid heating container 104 during heating operation, regardless of whether the user has selected a target temperature. The current temperature is determined by the processor of the appliance 102 using measurements obtained from a thermistor arranged within the appliance 102 to detect the temperature within the liquid heating container 104. The LED 177 on the handle 108 can also output different colors to indicate the temperature rise of the liquid in the container 104 (e.g., gradually changing from blue to red as the temperature rises from the initial temperature to the target temperature).

[0102] If a heat preservation operation mode is required after the liquid in the liquid heating container 104 has been heated to the target temperature, the user presses the heat preservation selection button 183. The user continues to press button 183 until the display 176 shows the desired heat preservation cycle duration. This selection is made by pressing the power button 181, and the appliance 102 continues to maintain the liquid temperature at that temperature for the selected heat preservation period.

[0103] During the heat preservation operation mode, the electronic display 176 is used to inform the user of the remaining time before the heat preservation heater of appliance 102 will be automatically turned off by the processor.

[0104] Figure 7 Showing Figure 5Appliance 102 includes an electronic display 176 that shows an alarm to the user that appliance 102 needs descaling. In this case, an LED 177 arranged on the handle 108 is configured to output a blue light 179 to provide the user with an additional indication that appliance 102 needs descaling. Scale buildup in liquid heating appliances prolongs the time it takes for the liquid inside the appliance to reach its boiling point, thereby increasing the total amount of electrical energy required. Notifying the user when appliance 102 needs descaling helps reduce the unnecessary extension of boiling time, thus reducing the negative environmental impact of appliance 102.

[0105] Figure 8 Showing Figure 5 Appliance 102, wherein electronic display 176 displays an alarm to notify the user that liquid heating container 104 is empty. In this case, LED 177 on handle 108 of appliance 102 is configured to output red light 179 to provide the user with additional indication that liquid heating container 104 is empty. Display 176 and LED 177 can also be used to warn the user that a dry-burning event has occurred, i.e., the control unit of appliance 102 has disconnected the heating element from the power supply after detecting that liquid heating container 104 is empty (e.g., because all liquid present in container 104 has turned into steam).

[0106] Figure 9 Showing Figure 5 Appliance 102, wherein electronic display 176 displays an alarm to notify the user that appliance 102 is providing “ECO” feedback to the user. In this mode, when appliance 102 is placed on power base 112, environmental usage feedback is provided to the user based on the color of light emitted by LED 177 on handle 108. LED 177 is configured to output green light 179 if the user’s habitual use of appliance 102 is determined by the processor of appliance 102 to be environmentally efficient, and to output red light 179 if the user’s habitual use of appliance 102 is determined to be non-environmentally efficient. In some embodiments, auxiliary component module 70 of appliance 102 includes a weight / fill sensor (not shown) that detects (i) the amount of liquid in liquid heating container 104 before appliance 102 has been removed from power base 112 and (ii) after appliance 102 has been returned to power base 112 (e.g., after making a beverage). The processor 74 compares the detected values ​​to determine the amount of liquid that has been dispensed from the liquid heating container 104, and thus determines whether the user has heated more liquid than they use (i.e., they have overfilled the appliance). When it is determined that the user has (e.g., habitually) overfilled the appliance 102, a red light 179 is output.

[0107] This can be used to "enhance" the use of appliance 102, while educating users on environmentally friendly and efficient usage practices. This can help improve how users operate appliance 102, thereby reducing its negative environmental impact.

[0108] Figure 10 A liquid heating appliance 202 according to another embodiment of the present invention is shown. Appliance 202 and Figure 1 and Figure 5 The appliances are essentially the same, except that module 70 includes a touchscreen organic light-emitting diode (OLED) display 276, which is disposed on the side wall of the liquid heating container 204 of appliance 202, between handle 208 and container spout 206. Appliance 202 has WiFi connectivity, allowing appliance 202 to retrieve and display a wide range of data to the user via display 276, including date and time, weather forecast, and upcoming appointments from the user's cloud-based calendar.

[0109] The appliance 202 is also configured to transmit data collected by sensors within the appliance 202 to a server or processor via WiFi for further processing or analysis.

[0110] like Figure 11 As shown, appliance 202 is also configured to run applications associated with different operating modes of appliance 202, including the temperature selection and keep-warm modes discussed above. Display 276 includes icons corresponding to power function 281, keep-warm function 283, and temperature selection function 285. Display 267 also includes an icon corresponding to timer function 287, which can be used to delay the start of operation of appliance 202 by a selected time period.

[0111] The electronic display 276 is also configured to provide the user with a volume indicator 289, which indicates the volume of liquid currently contained in the liquid heating container 204.

Claims

1. A liquid heating appliance comprising: a liquid heating vessel; an electric heater for heating liquid contained within the liquid heating vessel; and a control unit, the control unit comprising: an electrical adapter component for receiving an electrical power supply, the electrical adapter component comprising a neutral electrical contact and a live electrical contact; a first set of electrical tabs connected to the electrical adapter component for electrical connection to the electric heater to form a main power supply circuit; a thermomechanical actuator for connection in series with the main power supply circuit and operable at a predetermined temperature to interrupt the main power supply circuit; and a second set of electrical tabs connected to the electrical adapter component separately from the first set of electrical tabs for electrical connection to one or more auxiliary components of the liquid heating appliance to form a bypass power supply circuit; wherein, a first electrical tab of the first set of electrical tabs is connected to the neutral electrical contact of the electrical adapter component and a second electrical tab of the first set of electrical tabs is connected to the live electrical contact of the electrical adapter component; and a first electrical tab of the second set of electrical tabs is connected to the neutral electrical contact of the electrical adapter component and a second electrical tab of the second set of electrical tabs is connected to the live electrical contact of the electrical adapter component. The electrical adapter component is a cordless electrical adapter component.

2. The liquid heating appliance of claim 1, wherein, The first set of electrical tabs and / or the second set of electrical tabs are quick disconnect connectors.

3. The liquid heating appliance of claim 1 or 2, wherein, The first set of electrical tabs has a different shape to the second set of electrical tabs.

4. The liquid heating appliance of any preceding claim, wherein, The thermomechanical actuator is operable at a predetermined temperature below 100°C.

5. The liquid heating appliance of any preceding claim, wherein, The control unit comprises a switch operable to interrupt the main power supply circuit and a trip lever for allowing a user to manually operate the switch.

6. The liquid heating appliance of any preceding claim, wherein, 7. The control unit of claim 6, wherein the thermomechanical actuator is arranged to operate the trip lever at the predetermined temperature. The control unit comprises a switch operable by the thermomechanical actuator to interrupt the main power supply circuit, and wherein:

8. A liquid heating appliance as claimed in any one of the preceding claims, wherein, the first electrical tab of the first set of electrical tabs is connected to the neutral electrical contact via the switch; and / or the second electrical tab of the first set of electrical tabs is connected to the live electrical contact via the switch. The liquid heating appliance comprises the one or more auxiliary components connected to the second set of electrical tabs to form the bypass power supply circuit, and wherein the one or more auxiliary components comprise one or more of a processor, a control circuit, an electronic temperature sensor, a secondary electric heater, a user interface, an electronic display, a light source, a wireless transceiver, a weight sensor, a fill level sensor and / or a rechargeable power source.

9. The liquid heating appliance of any preceding claim, wherein, The one or more auxiliary components comprise:

10. The liquid heating appliance of claim 9, wherein, a processor; and an electronic temperature sensor arranged to detect a temperature of liquid within the liquid heating vessel, wherein the processor is arranged to control one or more further auxiliary components based on signals received from the electronic temperature sensor. The one or more auxiliary components further comprise a rechargeable power source connected to the processor.

11. The liquid heating appliance of claim 10, wherein, The one or more auxiliary components comprise:

12. The liquid heating appliance of any of claims 9 to 11, wherein, ​ the electronic temperature sensor / electronic temperature sensor is arranged to detect a temperature of the liquid within the liquid heating vessel; and an electronic display configured to display a temperature value measured by the electronic temperature sensor.

13. The liquid heating appliance of any of claims 9 to 12, wherein, the one or more auxiliary components comprise: a secondary electric heater arranged to heat the liquid contained within the liquid heating vessel; a user interface configured to receive a user input of a target temperature; and the processor / processor is arranged to control the secondary electric heater to heat the liquid contained within the liquid heating vessel to the target temperature.

14. The liquid heating appliance of claim 13, wherein, the user interface comprises an electronic display configured to display a countdown indicating a time remaining until the liquid contained within the liquid heating vessel reaches the target temperature.

15. The liquid heating appliance of claim 13 or 14, wherein the processor is configured to automatically switch off the secondary electric heater after a predetermined time, and wherein the user interface comprises an electronic display configured to display a countdown indicating a time remaining before the processor is to automatically switch off the secondary electric heater.

16. The liquid heating appliance of any of claims 9 to 15, wherein, the one or more auxiliary components comprise an electronic display configured to display an alert notifying a user that a descaling operation is required.

17. The liquid heating appliance of any of claims 9 to 16, wherein, the one or more auxiliary components comprise an electronic display configured to display an alert notifying the user that a total volume of the liquid within the liquid heating vessel is less than a threshold volume.

18. The liquid heating appliance of any of claims 9 to 17, wherein, the one or more auxiliary components comprise the electronic display / electronic display configured to display feedback to a user of the liquid heating appliance that attention is required in the environment.

19. The liquid heating appliance of any of claims 9 to 18, wherein, the one or more auxiliary components comprise an electronic display configured to display a volume indicium representing a volume of the liquid contained within the liquid heating vessel.

20. The liquid heating appliance of any of claims 16 to 19, wherein, the electronic display comprises an LED arranged on a handle of the liquid heating appliance.

21. The liquid heating appliance of any of claims 9 to 20, wherein, the one or more auxiliary components comprise a user interface comprising a touch screen display.

22. The liquid heating appliance of any of claims 9 to 21, wherein, the one or more auxiliary components comprise: the electronic display / electronic display; and a wireless transceiver for receiving data, wherein the electronic display is configured to display the data received by the wireless transceiver.

23. The liquid heating appliance of any of claims 9 to 22, wherein, the one or more auxiliary components comprise: the electronic temperature sensor / electronic temperature sensor is arranged to detect a temperature of the liquid within the liquid heating vessel; and the wireless transceiver / wireless transceiver is for transmitting data obtained by the electronic temperature sensor.

24. The liquid heating appliance of any of claims 9 to 23, wherein, the one or more auxiliary components comprise a light source and control circuitry arranged to control the light source.

25. The liquid heating appliance of claim 24, wherein, the light source is arranged to project light onto a surface on which the appliance is located in use.

26. The liquid heating appliance of claim 24 or 25, wherein the appliance further comprises a handle for lifting the appliance, and wherein the light source is arranged on the handle.

27. The liquid heating appliance of claim 26, wherein, The handle comprises a first portion extending substantially horizontally away from the appliance and a second portion extending from the first portion in a substantially vertical direction towards a base of the appliance, wherein the light source is arranged on an underside of the second portion of the handle.

28. A liquid heating appliance as claimed in any one of the preceding claims, wherein, The first set of electrical tabs are connected to the electric heater to form the primary power supply circuit, and the second set of electrical tabs are connected to a secondary electric heater to form the bypass power supply circuit.

29. A liquid heating appliance as claimed in any one of the preceding claims, wherein, The one or more auxiliary components include a sensor for detecting a volume of liquid in the liquid heating vessel and a control circuit, wherein the control circuit is configured to: determine, using the sensor, a first volume of liquid within the liquid heating vessel when the appliance is located on the power base station; detect when the appliance has been removed from the power base station and subsequently placed back on the power base station; after the detection, determine, using the sensor, a second volume of liquid within the liquid heating vessel; determine whether a difference between the first volume of liquid and the second volume of liquid is less than a threshold value; and in response to determining that the difference is less than the threshold value, send a signal to trigger a user alert device arranged to alert a user of the liquid heating appliance that an overfill has occurred.

30. A control unit for a liquid heating appliance, the control unit comprising: an electrical adapter component for receiving an electrical power supply, the electrical adapter component comprising a neutral electrical contact and a live electrical contact; a first set of electrical tabs connected to the electrical adapter component for electrical connection to an electric heater to form a primary power supply circuit; a thermomechanical actuator for connection in series with the primary power supply circuit and operable at a predetermined temperature to interrupt the primary power supply circuit; and a second set of electrical tabs connected to the electrical adapter component separately from the first set of electrical tabs for electrical connection to one or more auxiliary components to form a bypass power supply circuit; wherein, a first electrical tab of the first set of electrical tabs is connected to the neutral electrical contact of the electrical adapter component and a second electrical tab of the first set of electrical tabs is connected to the live electrical contact of the electrical adapter component; and a first electrical tab of the second set of electrical tabs is connected to the neutral electrical contact of the electrical adapter component and a second electrical tab of the second set of electrical tabs is connected to the live electrical contact of the electrical adapter component.

31. A liquid heating appliance comprising: a liquid heating vessel; an electric heater for heating liquid contained in the liquid heating vessel; a primary power supply circuit; a control unit, the control unit comprising: an electrical adapter component for receiving an electrical power supply, wherein the electrical adapter component is electrically connected to the electric heater via the primary power supply circuit; and a thermomechanical actuator connected in series with the primary power supply circuit and operable at a predetermined temperature to interrupt the primary power supply circuit; a bypass power supply circuit arranged in parallel with the primary power supply circuit such that operation of the thermomechanical actuator at the predetermined temperature does not interrupt the bypass power supply circuit. ​ ​ a rechargeable power source electrically connected to the electrical adapter component via the bypass power circuit.

32. The liquid heating appliance of claim 31, wherein, The rechargeable power source comprises a capacitive power source.

33. A liquid heating appliance as claimed in claim 31 or 32, wherein, The liquid heating appliance comprises one or more auxiliary components connected to the rechargeable power source, wherein the auxiliary components comprise one or more of a processor, an electronic temperature sensor, a secondary electric heater, a user interface, and / or an electronic display.

34. The liquid heating appliance of claim 33, wherein, The liquid heating appliance comprises an electronic temperature sensor arranged to detect a temperature of liquid within the liquid heating vessel and a processor connected to the rechargeable power source, wherein the processor is arranged to control the one or more auxiliary components based on signals received from the electronic temperature sensor.

35. A liquid heating appliance as claimed in any one of claims 31 to 34 wherein, The liquid heating appliance comprises: a secondary electric heater connected to the rechargeable power source and arranged to heat liquid contained within the liquid heating vessel; a user interface connected to the rechargeable power source and configured to receive a user input of a target temperature; and a processor connected to the rechargeable power source and arranged to control the secondary electric heater to heat liquid contained within the liquid heating vessel to the target temperature.

36. The liquid heating appliance of any of claims 31 to 35, further comprising a light source connected to the rechargeable power source.

37. The liquid heating appliance of claim 36, wherein, The liquid heating appliance comprises a control circuit connected to the rechargeable power source and configured to control the light source.

38. A liquid heating appliance as claimed in claim 36 or 37, wherein, The light source is arranged to project light onto a surface on which the appliance is located in use.

39. The liquid heating appliance of any of claims 36 to 38, wherein the appliance further comprises a handle for lifting the appliance, and wherein the light source is arranged on the handle.

40. The liquid heating appliance of claim 39, wherein, The handle comprises a first portion extending substantially horizontally away from the appliance and a second portion extending from the first portion in a substantially vertical direction towards a base of the appliance, wherein the light source is arranged on an underside of the second portion of the handle. The handle comprises a first portion extending substantially horizontally away from the appliance and a second portion extending from the first portion in a substantially vertical direction towards a base of the appliance, wherein the light source is arranged on an underside of the second portion of the handle.

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