A line voltage thermostat having a multiple heatsink switch. A total switch may have a semiconductor switch mounted on each heatsink of the multiple heatsink switch. The semiconductor switches of the respective heatsinks may be connected in parallel to represent the total switch. Each of the two or more heatsinks, having a semiconductor switch for switching, and in total conveying the same power as one equivalent switch with one total heatsink, may have higher maximum operating temperatures and higher thermal resistances than twice the thermal resistance of the one total heatsink. The two or more heatsinks may be situated within a housing of the line voltage thermostat, and be easier to distribute in the housing to achieve an efficient layout of a display and control buttons for the thermostat.

A line voltage thermostat having a multiple heatsink switch. A total switch may have a semiconductor switch mounted on each heatsink of the multiple heatsink switch. The semiconductor switches of the respective heatsinks may be connected in parallel to represent the total switch. Each of the two or more heatsinks, having a semiconductor switch for switching, and in total conveying the same power as one equivalent switch with one total heatsink, may have higher maximum operating temperatures and higher thermal resistances than twice the thermal resistance of the one total heatsink. The two or more heatsinks may be situated within a housing of the line voltage thermostat, and be easier to distribute in the housing to achieve an efficient layout of a display and control buttons for the thermostat.

A networked speaker device includes a sealed housing and an Ethernet port in the housing for receiving power and audio data from a network router via an Ethernet cable. A power supply subsystem in the housing manages the power received at the Ethernet port. A microprocessor subsystem, powered by the power supply subsystem, receives and processes the audio data to generate output audio signals. A digital audio amplifier, powered by the power supply subsystem, amplifies the output audio signals to drive a speaker driver to render an audio output. The device also includes at least one heater resistor in the housing powered by the power supply subsystem. The at least one heater resistor is controlled by the microprocessor subsystem to automatically heat the interior of the housing when temperature inside the housing falls below a given temperature.

A static voltage stability margin evaluation method and system, and a terminal device are related to the field of integrated energy system operation. The method includes the following steps: establishing a thermal dynamic model of a heating system; establishing a thermoelectric coupling device model; establishing a static voltage stability margin model of an electric power system that considers thermal dynamics of the heating system; and solving the model to obtain a voltage stability margin. In the present invention, a static voltage stability margin that considers thermal dynamics of a heating system can be obtained, and a Pareto boundary of the static voltage stability margin that considers the thermal dynamics can be obtained through a dual-objective nonlinear optimization method, so that an impact of thermoelectric coupling on voltage stability and an impact of thermal inertia of the heating system on a voltage stability margin can be revealed.

The present invention relates generally to the field of heaters. More specifically, the present invention relates to a battery-powered heater device. The device is primarily comprised of a housing, further comprised of a heating element, temperature display, and a temperature sensor. The housing is further comprised of a voice assistant, microphone, and at least one speaker. The device is also comprised of a battery pack, further comprised of a fireproof casing, a male connection port, and a female charging port. The male connection port connects to the female receiving port located on the housing. The device is further comprised of a remote. The remote may be comprised of a smart voice assistant. The device provides a user with a way to heat spaces without the need to access electrical power through wall outlets. The device provides a way for a user to control a portable heater with voice activated commands.

The present invention relates to a thermostat system, to a thermostat unit, as well as to a method for managing power supply in a thermostat unit. A thermostat unit is connected between a power supply and a resistive heating element. Input power is received at the thermostat unit. A temperature difference is calculated between a target temperature and a current temperature. The input power is controlled by operating a power supply module between a heating mode wherein in the input power is channeled to the output port for feeding the resistive heating element based on the temperature difference and a regenerative mode wherein the input power is channeled to an energy storage device for charging said energy storage device in order to supply power therefrom to electronic components of the thermostat unit.

A networked speaker device includes a sealed housing and an Ethernet port in the housing for receiving power and audio data from a network router via an Ethernet cable. A power supply subsystem in the housing manages the power received at the Ethernet port. A microprocessor subsystem, powered by the power supply subsystem, receives and processes the audio data to generate output audio signals. A digital audio amplifier, powered by the power supply subsystem, amplifies the output audio signals to drive a speaker driver to render an audio output. The device also includes at least one heater resistor in the housing powered by the power supply subsystem. The at least one heater resistor is controlled by the microprocessor subsystem to automatically heat the interior of the housing when temperature inside the housing falls below a given temperature.

A heating box for keeping tools heated while stored within the box is provided. The heating box includes a heater configured to heat an interior of the heating box, a lock configured to lock and unlock a lid of the heating box, and a user interface configured with heating, connectivity, and locking controls.

An infrared heating system comprises an infrared heater. The infrared heater comprises at least one heating element and an infrared emission surface configured to emit infrared radiation across a heating angle to a heating area; an infrared temperature sensor, the infrared temperature sensor having a field of view defined by a sensor angle, the field of view comprising a portion of the heating area; and a controller configured to: receive a temperature value of the field of view from the infrared temperature sensor; calculate a mean radiant temperature of the heating area based on the temperature value from the field of view; output a control signal corresponding to the mean radiant temperature; and transmit the control signal to a component of the infrared heater, wherein the infrared temperature sensor is outside of the heating area and/or is in the plane of the emission surface

An example sauna stove can include an open-air container with a plurality of sides and is open at the top, a heat-conductive plate that includes a first surface that acts as a side to the open-air container and a second surface opposite the first surface, an electric heating element that is positioned on the second surface of the heat conductive plate, and a furnace chamber that utilizes the second surface of the heat-conductive plate as a surface to transfer heat generated by the furnace chamber to the open-air container.