System for supplementation of appliance standby mode with internal power source

A system is provided for supplementing the power usage of an appliance with an internal power source, such as e.g., a battery, in order to limit the overall power consumption of the appliance while in standby mode. The system can allow for replenishing the internal power source when the appliance is not in standby mode or even when in standby mode if such will not exceed the external power source consumption limit. In the event the internal power source is not available or is reaching depletion, the system can provide for disabling electronic features of the appliance in order to maintain the external power source consumption below the desired limit.

FIELD OF THE INVENTION

The present invention relates to a system for supplementing the power usage of an appliance with an internal power source, such as e.g., a battery, in order to limit the external power consumption of the appliance while in standby mode.

BACKGROUND OF THE INVENTION

Modern appliances, particularly kitchen appliances such as ovens, ranges and cook tops, are frequently provided with electronic features such as clocks, timers, and displays. These features require electricity not only when the appliance is in use but also when the appliance in not in use. More particularly, when not in use, an appliance enters into standby mode until the next event requiring operation of the appliance due to e.g., the user turning on the appliance or a timer activating the appliance. While in standby mode, the appliance still continues to consume a certain amount of energy to maintain operation of at least a portion of the electronics such as e.g., the clock or a timer and an associated display.

It is desirable to limit the amount of power that an appliance requires from an external supply during standby mode. For example, industry standards and/or government regulations may limit the maximum amount of power that an appliance can draw from the electrical power system of a home or business during standby mode. An external power consumption limitation of one watt, for example, may be required for certain appliances when in standby mode.

Unfortunately, the features associated with such electronics in many modern appliances require a certain minimal amount of power even during standby mode. This minimal amount may exceed the maximum power consumption limitation provided by industry standards and/or government regulations. While advances are being made in reducing the amount of power required by such appliance electronics during standby mode, these advances may not be able to provide electronics having all of the features desired by consumers while simultaneously reducing the power consumption during standby mode to a level that is below the maximum consumption limitation of industry standards and/or government regulations.

Accordingly, a method and apparatus for reducing the amount of energy that an appliance draws from an external power supply during standby mode is desirable. More particularly, a method and apparatus that allows an appliance to operate electronics as required during standby mode without drawing power from an external supply in an amount that exceeds a maximum external power consumption limitation would be useful.

BRIEF DESCRIPTION OF THE INVENTION

In one exemplary aspect, the present invention provides a method of supplementing power to an appliance. The method can include the steps of determining whether an appliance is in standby mode; providing power from an internal power source to one or more electronic components of the appliance when in the standby mode so as to prevent the external power consumption of the appliance from exceeding a predetermined external power consumption limit of the standby mode; and replenishing the internal power source without causing the appliance to exceed the predetermined external power consumption limit when in standby mode.

In another exemplary embodiment, the present invention provides an appliance configured with an external power consumption limitation, EPCL, during a standby mode of the appliance. This exemplary appliance includes at least one feature that operates when the appliance is not in a standby mode and at least one electronic feature that continues to operate when the appliance is in standby mode. The appliance also includes at least one internal power source. At least one processing device is provided and is configured to determine when the appliance is in standby mode; provide power from the internal power source to the at least one electronic feature during the standby mode when needed to prevent the appliance from exceeding the ECPL during the standby mode; and replenish the internal power source without causing the appliance to exceed the predetermined external power consumption limit of the standby mode.

DETAILED DESCRIPTION OF THE INVENTION

The present invention relates to a system for supplementing the power usage of an appliance during its standby mode. The system uses an internal power source, such as e.g., a battery, to supply power so as to limit the external power consumption of the appliance while in standby mode. The system can allow for replenishing the internal power source when the appliance is not in standby mode or even when in standby mode if such will not exceed the external power source consumption limit. In the event the internal source is not available or is reaching depletion, the system can provide for disabling electronic features of the appliance in order to maintain the external power source consumption below the desired limit. Reference now will be made in detail to embodiments of the invention, one or more examples of which are illustrated in the drawings. Each example is provided by way of explanation of the invention, not limitation of the invention. In fact, it will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the scope or spirit of the invention. For instance, features illustrated or described as part of one embodiment can be used with another embodiment to yield a still further embodiment. Thus, it is intended that the present invention covers such modifications and variations as come within the scope of the appended claims and their equivalents.

FIG. 1illustrates a gas range appliance12that includes an exemplary embodiment of a system for supplementing an appliance with an internal power source during standby mode. Gas range appliance12is provided by way of example only. The present invention may be used with other appliances including ovens, cook tops, washing machines, dryers and other appliances that can consume power during a standby mode and that are subject to an external power consumption limit or EPCL.

Range12includes an outer body or cabinet13that incorporates a generally rectangular cook top14. An oven, not shown in detail, is positioned below cook top14and has a front-opening access door16. A range backsplash18extends upward of a rear edge20of cook top14and contains various control selectors (not shown) for selecting operative features of heating elements for cook top14and the oven.

Cook top14includes four gas fueled burners10, which are positioned in spaced apart pairs positioned adjacent each side of cook top14. A recessed area24of cook top14surrounds each burner10. Recessed area24is positioned below an upper surface26of cook top14and serves to catch any spills from cooking vessels (not shown inFIG. 1) being used with cook top14. Each burner assembly10extends upwardly through an opening in recessed areas24, and a grate28is positioned over each burner10. Each grate28includes a flat surface thereon for supporting cooking vessels and utensils over burner assemblies10for cooking of meal preparations placed therein. For purposes of describing the invention, four burners10as might be used on a kitchen stove appliance are depicted. However, using the teachings disclosed herein, one of skill in the art will understand that the present invention may be used with e.g., a different number of burners10, electric heating elements instead of burners, and even different appliances as well.

Backsplash18also includes a display30that may be provided with a variety of features for appliance12. Display30may include a clock, timer, temperature information, and other features as desired. Also, a variety of other electronic features can also be provided with appliance12that may or may not require use of display30. For example, appliance12may have various gas detection sensors throughout appliance12to determine whether a leak is present. Such features, along with the oven, may be controlled by an electronic range control that may include one or more processing devices.

The electronic features require that appliance12is connected to an external power supply for continued operation. Typically, appliance12will be connected by electrical wiring to the power supply system of the building or structure containing appliance12. For example, appliance12may be connected to a supply of 120 volts and/or 220 volts of alternating current to operate appliance12along its electronic features. In the case of an appliance that does not use gaseous fuel, such as an all electric range or oven, the external power supply will also be used to power these features of the appliance during operation as well.

When burners10and the oven of appliance12are not operating, appliance12is in a state that is referred to herein as a standby mode. More particularly, when the primary use or function of appliance12(in this example, providing heat for the cooking of food) has been switched off by the user, then appliance12is in a standby mode. As such, the appliance remains in standby mode until the user activates one or more features such as a burner10and/or the oven.

During standby mode, appliance12will continue to consume external power (i.e. energy) to operate one or more electronic features. For example, if appliance12includes a clock with an electronic readout in display30, this feature will require power even when appliance12is in standby mode. Similarly, timers and/or other features may be included that continue to consume energy during the operation of the appliance12.

As previously indicated, industry standard and/or government regulations may require that the external power consumption of appliance12is limited when in the standby mode. More particularly, an external power consumption limit for the standby mode of appliance12may be imposed. By way of example, in 1999 the International Energy Agency (IEA) proposed 1 watt as an external power consumption limit for all appliances when in standby mode. Other limitations may be used with the present invention as well.

Frequently, however, the external power consumption requirement of an appliance during standby mode will exceed the external power consumption limit such as the 1 watt limit proposed by the IEA. The appliance may need to exceed the external power consumption limit only for brief intervals or such may be more continuous during the standby mode. Regardless, in order to meet an external power consumption limit that is less than the power needed by the appliance during standby mode, the present invention provides a system for continuing to operate such electronic features of the appliance during standby mode.

More particularly, appliance12is provided with a system for supplementing the external power supply in order to avoid exceeding the external power consumption limit during standby mode. An internal power supply (not shown) such as a battery, capacitor, or other energy storage device is provided that can store power for use during standby mode. Such internal power supply is replenished (e.g., recharged) when appliance12is not in standby mode or even during standby mode if replenishing can be provided during standby mode without exceeding the external power consumption limit. A processing device such as a microprocessor or other controller (not shown) can be configured to provide for such operations of appliance12.

It should be understood that as used herein, “internal” does not require that the internal power supply must be located within appliance12such as within cabinet13. Instead, “internal” is used to distinguish from the external power supply provided by e.g., the external power distribution system to which appliance12is connected. As such, the internal power supply is preferably contained within the casing or cabinet13of appliance12but may be located exterior thereto as well.

FIG. 2provides a flow chart illustrating an exemplary method of operating appliance12so as to supplement its power consumption during standby mode. For example, appliance12may be provided with an electronic range control having a processing device configured to operate as shown inFIG. 2. From start100, the processing device determines whether appliance12is in standby mode in step105. More specifically, appliance12determines whether both burners10and the oven are currently turned off. If appliance12is not in standby mode, then in step110the processor checks to determine whether the internal power source (e.g., battery, capacitor, etc.) is fully charged. In this way, the power level of the internal power source is maintained so that such is available when needed during standby mode.

If appliance12is in standby mode, then in step115the processor determines whether the current power requirement or power usage of appliance12is greater than the external power consumption limit, or EPCL, for standby mode. If the current power requirement is not greater than the EPCL, then appliance12can continue to use power from an external power source without supplement. In such case, the processor continues to monitor the power requirements of appliance12while it remains in standby mode to make sure the EPCL is not exceeded. Additionally, because the EPCL is not being exceeded, appliance12can proceed to step135, where the internal power source is replenished (if needed) without exceeding the EPCL. By way of example, assume the EPCL is one watt and the appliance is in standby mode. If appliance12is only consuming 0.5 watt in standby mode, then up to 0.5 watt is available for replenishing the internal power source.

However, if the current power requirement of appliance12does exceed the EPCL, then the appliance needs to supplement the external power supply so not to exceed the EPCL. Accordingly, in step120, appliance12begins to supplement the external power from the internal power source during standby mode so as to avoid exceeding the EPCL. In the event the power requirements of appliance12drop back below the EPCL during the standby mode, appliance12can return to relying solely upon the external power source. For example, if the EPCL is 1 watt and the appliance needs 1.25 watts during all or some portion of the standby mode, then appliance12can allow the internal power source to provide 0.25 watts so that the EPCL is not exceeded. If appliance12only needs 0.75 watts during the standby mode, then the internal power supply is not needed and appliance12can continue operation using an external power source until appliance12is no longer in standby-by mode or until the internal power supply is needed.

Depending upon e.g., the amount of power required during the standby mode, the length of the standby mode, and/or the amount of power that is stored by the internal power source, the use of the internal power source during the standby mode could eventually deplete the internal power source if remedial actions are not taken. Accordingly, in step125, appliance12monitors the internal power source to determine if its power level has dropped below a predetermined value Pmin. For example, if the internal power source is a battery, a processor in appliance12may determine whether the voltage has fallen below a certain predetermined voltage value.

If the internal power source has not dropped below predetermined value Pmin, then appliance12continues to monitor whether the appliance is in standby mode and if power must be supplemented. However, if the internal power source has dropped below Pmin, then before taking remedial action, appliance12determines in step130whether the internal power source can be replenished without exceeding the EPCL. If so, then in step135appliance12proceeds to replenish the internal power source (e.g., charge the battery) and continues to monitor whether appliance12is in standby mode. If the internal power source cannot be replenished without exceeding the EPCL, then in step140appliance12begins to disable one or more features of appliance12that are operating during the standby mode so as to lower the power requirements of the appliance.

For example, a processor can be programmed to disable features until e.g., the power requirements during standby mode are reduced by half or eliminated completely. Superfluous or less important features may be eliminated first. Other techniques for reduction may be used as well. Any features disabled during step140can be reactivated as part of e.g., step110once appliance12is no longer in standby mode and the internal power source is being replenished. Alternatively, some features may be restored during the standby mode if the internal power source has been replenished.

FIG. 2is provided by way of example only. Using the teachings disclosed herein, one of ordinary skill in the art will understand that other methods may be used within the scope of the present invention as well. By way of further example, assume appliance12has gas burners10while the oven includes electrically powered heating elements. Appliance12could be configured to provide for replenishing the internal power source when gas burners10are being used even though the oven is turned off—because the use of gas burners10would mean the appliance is not in standby mode.

Accordingly,FIG. 3provides an additional flow chart illustrating a modification of the exemplary method ofFIG. 2. More specifically, in step106, the appliance12determines whether the oven is off. If the oven is on, appliance12is not in standby mode and the internal power source can be replenished as in step110. If the oven is off, the appliance then determines if all burners10are off in step107. If any burner is on, then appliance12is not in standby mode and the internal power source can be replenished as in step110—even if the oven is off. Alternatively, if the burners10and oven are off, appliance12proceeds to step115as previously described withFIG. 2.