A sensor device includes: a primary battery; a secondary battery that is charged by energy harvesting; a sensor that is operated by electricity supplied from the primary battery or from the secondary battery; a source-of-electricity switching circuit that switches a source of electricity for the sensor between the primary battery and the secondary battery; a notification unit that makes a notification indicating information; and a controller that controls the sensor and the notification unit. The source-of-electricity switching circuit switches the source of electricity to the primary battery when a voltage of the secondary battery falls below a predetermined first reference voltage in the case where the source of electricity is the secondary battery. The controller causes the notification unit to make a notification indicating that an operation of the secondary battery is unstable, when the voltage of the secondary battery falls below the first reference voltage.

A control method for a direct current electrical device and a direct current electrical device. The method includes: acquiring input parameters of a power supply of the direct current electrical device (S102), identifying a type of the power supply according to the input parameters (S104), and determining an operation mode of the direct current electrical device corresponding to the type of the power supply, and controlling an operation of the direct current electrical device according to the operation mode (S106). The present disclosure improves the universality and operation performance of a direct current electrical device.

A microelectronic device includes: a photovoltaic module configured to convert a light energy into an electric energy; a converter configured to convert a voltage output from the photovoltaic module into a predetermined voltage; a capacitor configured to store an electric energy transferred from the converter; and a controller configured to predict an available current of a next time slot based on the electric energy stored in the capacitor, and determine a consumed current of a load system of the next time slot based on the predicted available current.

A selection circuit architecture makes it possible to perform upward and/or downward transitions in sets of sequences of slow and fast phases so as at the same time to solve the problems of inductive switching noise and the problems of currents in the supply rails. This solution has multiple advantages linked to the ease of implementation and flexibility of configurations that are possible for adapting to the specific constraints when designing the circuit.

A water heater can include a housing and a heating system disposed within the housing, where the heating system is configured to heat a fluid. The water heater can also include a switch coupled to the heating system, where the switch operates between a first position during normal operations and a second position during an outage. The water heater can further include a primary power source coupled to the switch, where the primary power source is configured to provide primary power to the heating system through the switch during the normal operations. The water heater can also include an uninterruptible power supply (UPS) coupled to the switch, where the UPS is configured to provide reserve power to the heating system through the switch during the outage, and where the UPS is integrated with the housing.

A water heater can include a housing and a heating system disposed within the housing, where the heating system is configured to heat a fluid. The water heater can also include a switch coupled to the heating system, where the switch operates between a first position during normal operations and a second position during an outage. The water heater can further include a primary power source coupled to the switch, where the primary power source is configured to provide primary power to the heating system through the switch during the normal operations. The water heater can also include an uninterruptible power supply (UPS) coupled to the switch, where the UPS is configured to provide reserve power to the heating system through the switch during the outage, and where the UPS is integrated with the housing.

A liquid heating appliance for making a beverage, the liquid heating appliance comprising: a plurality of heating components for heating a liquid, where at least a first of the plurality of heating components is powered using mains power, a power management system, wherein the power management system comprises: a controller, and an energy storage device, wherein the controller is arranged to: control an amount of the mains power applied to the first of the plurality of heating components, control an amount of stored power from the energy storage device to be applied to at least a second of the plurality of heating components, and switch polarity of the voltage of the stored power from the energy storage device to be applied to the second of the plurality of heating components after one or more heating cycles associated with the second of the plurality of heating components.

The present invention relates to a handheld solar powered electric lighter designed to create enough heat to selectively light a campfire, a cigarette and numerous other applications. The lighter includes a plurality of solar panels to absorb sunlight and convert same into electricity which is stored in an internal battery. At least one heating element capable of producing a flame using the electrical power stored in the internal battery. The lighter further includes LED lights along one or more surfaces which illuminate the lighter for use in low light areas, and a Type C USB charger for recharging an electronic device. An adjuster is present to lower or raise the at least one heating element for use, wherein the at least one heating element is raised by opening a hinged lid for easy accessibility.

A device, system, and a computer-implemented method a for identifying an anomaly in an operation of a device includes comparing, by an electrical power analyzer, a current power draw signature of the device with a known power draw signature of the device. There is a determining as to whether at least one anomaly is present in the current power draw signature. A warning is generated in response to determining the at least one anomaly is present in the current power draw signature.

A power supply circuit for powering components of a facility are disclosed. The power supply circuit may include a power transformer, a power input terminal, a power output terminal, a bridge, a relay, and a control circuit. The relay is connected between the power input terminal and the power output terminal. A primary side of the power transformer is coupled between the relay and the power output terminal. The bridge is coupled to the secondary side of the power transformer. In a normal power mode, the control circuit closes the relay and operates the bridge as a rectifier. In an emergency power mode, the control circuit opens the relay and operates the bridge as a pulse width modulator. In this manner, the bridge and the power transformer can be used both to charge a battery during normal operation and generate emergency AC power from the battery.