Abstract: A photonic heater is provided. The photonic heater includes a current source and a transfer circuit. The transfer circuit connected to the current source. The photonic heater further includes a heating element. The heating element is connected to the transfer circuit. The transfer circuit is operable to regulate an amount of current being transferred from the current court to the heating element.

Abstract: A method for automatically operating a heating system includes operating a thermostat at a set point having a default set point value, automatically receiving an indoor temperature signal from an indoor temperature sensor, automatically receiving an outdoor weather indicator signal representing a measured or predicted outdoor weather condition, based on the outdoor weather indicator signal, determining a factor affecting heat flow out of water pipes adjacent to an indoor space, comparing the factor affecting heat flow to a pre-determined freeze protection point, based on the comparison, determining whether to maintain the set point at the default set point or to raise the set point to a computed set point higher than the default set point, and using the thermostat to automatically control the heating system.

Abstract: A surface-mountable electrical circuit protection device includes layers defining a first PPTC resistive element, a second PPTC resistive element, and at least one heat-generating electrical component such as a planar zener diode chip positioned between, and in thermal contact with, the first and second PPTC elements, such that an electrical current above a threshold level passing through the component causes the component to heat, the heat being transferred to the PPTC resistive elements and tripping at least one, and preferably both of the first or second PPTC elements to a high resistance state. A series of edge-formed terminal electrodes enable surface-mount connection of the first and second PPTC elements and the electrical component to an electrical circuit substrate, such as a printed circuit board. A method for making the device is also disclosed.

Abstract: A seat heater includes a seat-warming heater which is connected to a power source and warms a person sitting on a seat, an over-temperature-preventing part which disconnects the connection between the seat-warming heater and the power source when the over-temperature-preventing part is heated to a predetermined temperature so as to prevent over-temperature of the seat-warming heater, and a heater which heats the over-temperature-preventing part, wherein the over-temperature-preventing part is non-return type, and the heater for the over-temperature-preventing part is arranged to cover opposite portions of the over-temperature-preventing part, thereby realizing both higher output and improved safety.

Abstract: A method and system for efficiently extending the operating temperature range of high power components within a system/device. An embedded monitor measures local temperatures such as junction temperatures of components. When the measured temperature is less than the lowest operational temperature threshold of the component, temperature control logic initiates pre-heating to raise the component's temperature to an operational level, utilizing a heating source. The component (or device) is made operational only when the temperature is at or above the operational level. The temperature control logic maintains the operational temperature of the component using the high power dissipated by components within the operating system/device as a self heating source.

Abstract: The seat heater of the present invention comprises: a warming heater provided in a seat section of a seat; a warming heater provided in a back section; an overheating-prevention unit; and a heating unit that heats the overheating-prevention unit, the overheating-prevention unit being configured by a non-return type temperature switch. This configuration allows activating the non-return type overheating-prevention unit prior to reaching an unsafe event, and turns the warming heaters OFF reliably, whereby a seat heater with an aim of implementing both high output and safety can be provided.

Abstract: A temperature-control circuit of a heating line and a temperature-control method thereof are disclosed. The method comprises steps of: outputting a forward square-wave signal by a first forward square-wave signal generation circuit; outputting a reverse square-wave signal by a reverse square-wave signal generation circuit; and outputting a varied forward square-wave signal by a second forward square-wave signal generation circuit. Above square-wave signal generation circuits are respectively connected with an AND gate. When the input square-wave signals are simultaneously logic high, a switch is triggered by a trigger circuit to heat the heating wire.

Abstract: A temperature-control circuit of a heating line and a temperature-control method thereof are disclosed. The method comprises steps of: outputting a forward square-wave signal by a first forward square-wave signal generation circuit; outputting a reverse square-wave signal by a reverse square-wave signal generation circuit; and outputting a varied forward square-wave signal by a second forward square-wave signal generation circuit. Above square-wave signal generation circuits are respectively connected with an AND gate. When the input square-wave signals are simultaneously logic high, a switch is triggered by a trigger circuit to heat the heating wire.

Abstract: A surface-mountable electrical circuit protection device includes layers defining a first PPTC resistive element, a second PPTC resistive element, and at least one heat-generating electrical component such as a planar zener diode chip positioned between, and in thermal contact with, the first and second PPTC elements, such that an electrical current above a threshold level passing through the component causes the component to heat, the heat being transferred to the PPTC resistive elements and tripping at least one, and preferably both of the first or second PPTC elements to a high resistance state. A series of edge-formed terminal electrodes enable surface-mount connection of the first and second PPTC elements and the electrical component to an electrical circuit substrate, such as a printed circuit board. A method for making the device is also disclosed.

Abstract: An electric switching circuit with a first current path for operating an electric motor and with a second current path for operating a first heater. The electric motor drives a fan during which an air flow created by the fan is heated by the first heater. A switch for opening or closing the second current path in response to an actual operating state of the electric motor is, in the second current path, connected in series to the first heater. The switch is designed as a bimetallic switch and a second heater is assigned thereto that is arranged and designed for detecting the actual operating state of the electric motor and for controlling the bimetallic switch by changing its ambient temperature in response to the detected operating state.

Abstract: A heating body is provided. The heating body includes a plurality of heating members having different thermal expansion coefficients and a tube in which the heating members are disposed. At least one of the plurality of heating members supports other heating member.

Abstract: A multistage control system of a Positive Temperature Coefficient (PTC) heater for a vehicle is disclosed with a PTC heater that contains heating elements relevant to a first, second, and third stages. An Electronic Control Unit (ECU) outputs a control signal to a first relay, which switches the first stage into an ON and OFF state, for controlling the operation of the first stage of the PTC heater. A heater controller outputs control signals to a second relay and third relay, respectively, for controlling the operation of the second and third stages of the PTC heater, only if the first stage of the PTC heater is in activation via the ECU, wherein the second relay and the third relay each switch the second and third stages into an ON and OFF state.

Abstract: The unit comprises: a casing (1) with a protected interior, a window (2) closed by a transparent element (3) and support means (4) to carry an optical system (5) facing said window (2); image detection means (6) accommodated in said casing (1), facing said optical system (5), an associated with connection means with the exterior for the supply and/or bidirectional signal exchange; and heating means to provide thermal energy to said transparent element (3), or to an adjacent zone thereto, aiming at avoiding lacking transparency problems, due to ambient and climatic factors.

Abstract: A method and a circuit for preventing over-heat of heat-generating device which are provided with a trigger circuit and a microprocessor on a heater circuit. And the trigger circuit is connected with a power source and a heat-generating device for heating the heat-generating device. The above-mentioned heater circuit is connected with a thermo fuse, a resistor and a reactive trigger circuit. Another end of the reactive trigger circuit is connected with the microprocessor for advancedly detecting whether the microprocessor is in abnormal condition. Once the microprocessor is damaged, the power source, the thermo fuse and the resistor make a loop and the resistor is heated to ruin the thermo fuse for terminating heating. Also, when the microprocessor works normally, the heater circuit and a switch for controlling temperature on reactive trigger circuit are detected to determine whether to terminate the heater circuit.

Abstract: An apparatus and method for testing thermal switches is disclosed including modulating the temperature of a receiver in thermal contact with a thermal switch at a first rate within a range containing the nominal switch temperature of the thermal switch. A first temperature at which the switch changes state is recorded. The temperature is then modulated at a second rate and a second temperature at which the switch again changes state is recorded. The temperature may be modulated at a third rate slower than the second rate to determine a third temperature. The first, second, and third switch temperatures are then processed and output to an operator. The first, second, and third rates may be determined according to an exponentially decreasing function.

Abstract: A process for manufacturing a composite polymeric circuit protection device in which a polymeric assembly is provided and is then subdivided into individual devices. The assembly is made by providing first and second laminates, each of which includes a laminar polymer element having at least one conductive surface, providing a pattern on at least one of the conductive surfaces on one laminate, securing the laminates in a stack in a desired configuration, at least one conductive surface of at least one of the laminates forming an external conductive surface of the stack, and making a plurality of electrical connections between a conductive surface of the first laminate and a conductive surface of the second laminate. The laminar polymer elements may be PTC conductive polymer compositions, so that the individual devices made by the process exhibit PTC behavior.

Abstract: A heating apparatus includes a heating roller that is heated by heating units, a main power supply that supplies power from an external power supply to the main heating unit, and an auxiliary power supply that supplies power to the auxiliary heating unit. The auxiliary power supply further includes a mass capacitor of multiple capacitor cells, which are charged by the external power supply. The connection mode of the capacitor cells is changed at least at the time of electric discharge.

Abstract: A system for wiring a heating element in an electrical appliance to a conventional thermostat switch in a new manner and a new thermostat for supporting the new wiring system. The new wiring system avoids switching the full heating element current for both hot power leads of a split-phase power system to reduce the amount of wiring needed to wire the thermostat switch to a heating element and a pilot lamp showing that current is being provided to the heating element.

Abstract: A self heating thermal protector located in close proximity to a remotely located incandescent light fixture for controlling the flow of current to the lighting fixture by measuring the rate of heat flow from a dedicated heat source. Current is permitted to flow to the lighting fixture when the temperature of the self heating thermal detector is sufficient to avoid deterioration of electrical components such as plastic parts and wire insulation in the associated fixture. The thermal detector interrupts the flow of current to the associated fixture when the temperature of the self heating thermal protector increases to a temperature that is not safe.

Abstract: Film heater apparatus and method for heating a melt channel in a molding device includes structure and/or steps whereby a first dielectric layer is disposed on a surface of a substrate. An active heating element is disposed on the first dielectric layer, the active heating element being configured to generate heat to heat the melt channel. The active heating element has contact terminals arranged to support an electrical connection to the active heating element. A second dielectric layer is disposed over the active heating element, but not covering the contact terminals, thereby permitting coupling of the heater element to an electrical supply.

Abstract: A heating apparatus includes a heating roller that is heated by heating units, a main power supply that supplies power from an external power supply to the main heating unitl, and an auxiliary power supply that supplies power to the auxiliary heating unit. The auxiliary power supply further includes a mass capacitor of multiple capacitor cells, which are charged by the external power supply. The connection mode of the capacitor cells is changed at least at the time of electric discharge.

Abstract: A control circuit for a clothes dryer operating with a 120 volt power supply compensates for changes in the ambient temperature to compensate for premature advancement of the dryer timer motor during an automatic drying cycle. The control circuit has a thermally biased low outlet thermostat and a thermally biased high outlet thermostat which control the energization of a heater in the dryer. The low outlet thermostat and the high outlet thermostat each open circuit at respective lower and higher predetermined temperatures when the outlet air flow from the dryer drum reaches the lower or higher respective predetermined temperatures to thereby de-energize the heater and advance the timer motor. The control circuit includes a thermally biased ambient thermostat that is normally open and unbiased, and that switches control of the heater energization from the low output thermostat to the high outlet thermostat when thermally biased and when the ambient temperature rises above a predetermined ambient temperature.

Abstract: The present invention is a self heating thermal protector located in close proximity to an incandescent light fixture for controlling the flow of current to the associated lighting fixture by measuring the rate of heat flow from a dedicated heat source. Current is permitted to flow to the lighting fixture when the temperature of the self heating thermal detector is sufficient to avoid deterioration of electrical components such as plastic parts and wire insulation in the associated fixture. The thermal detector interrupts the flow of current to the associated fixture when the temperature of the self heating thermal protector increases to a temperature that is not safe.

Abstract: A control unit (3) for controlling an electric household appliance, e.g. a refrigerator, is connected in series with a positive temperature coefficient (PTC) resistive unit (4) which, when supplied with electric current, generates sufficient heat to activate a thermally activated actuating element (6) for selectively turning on/off respective auxiliary switches (9) of the electric household appliance. The thermally activated actuating element (6) includes a temperature-deformable element (7), e.g. a bimetallic plate, the deformation of which is transmitted by kinematic links (10) to a camshaft (8), the cams (12) of which cooperate with the auxiliary switches (9) of the electric household appliance to selectively turn on/off the auxiliary switches (9).

Abstract: A thermally sensitive, overheat protection control for a thick film electric heater comprises a bimetallic actuator (68) arranged for making good thermal contact with the heater, and a moveable electrical contact (78) for engagement with a contact provided on the heater. The moveable contact (78) is operatively coupled to the bimetallic actuator (68) such that in use upon operation of the actuator, it moves out of engagement with the heater contact to interrupt the electrical supply to the heater. The bimetallic actuator (68) and the moveable contact are mounted on a common generally U-shaped leaf spring (66) which acts in use resiliently to bias the actuator (68) into thermal contact with the heater and the moveable contact (78) into electrical contact therewith. The control also comprises a creep action bimetallic actuator (110) mounting a contact at one end, the actuator acting as a thermostatic control for the heater.

Abstract: A protective element contains a heat-generating member and a low melting metal member on a substrate. The low melting metal member is caused to blow out by the heat generated by the heat-generating member. The number of locations on the low melting metal member which are able to blow out is larger than the number of locations which are supposed to blow out so that the protective element is endowed with a “fail-safe” function.

Abstract: A heating element and a process for conducting the operating heat of a semiconductor switch to a heating cell which is triggered by the semiconductor switch via first and second heat and current conducting material strips and a frame terminal with an interposed heat-conducting insulating film. The semiconductor switch is provided with a cooling fin and is applied directly to a surface of the first heat and current conducting material strip.

Abstract: An integrated thermal buckling micro switch is made by using electromechanical technology to integrate sensors and actuators on a single chip. An epitaxial chip is used and etched to form a mesa structure on a thin silicon film, whereon at least a thermal sensing element and a heating element are disposed. When an output signal of the thermal sensing element is greater than a pre-set critical value in a control circuit, the heating element is driven to heat, so that the thin silicon film will create a thermal buckling effect that makes the mesa structure touch at least one contact point on the baseboard to cut off or effectuate the circuit. On the contrary, when heating is ceased, the mesa structure will return back to the original normal state, and thereby, switching and controlling an external load can be achieved.

Abstract: An actuation device comprising:at least two thermal actuators (5A,5B) electrically supplied, each thermal actuator (5A,5B) comprising relevant thrust means (4A,6A,4B,6B) being movable to perform a predetermined stroke;at least a working means (12) moved by means of said thermal actuators (5A,5B) and connected with the thrust means (4B,6B) of one of said thermal actuators (5A,5B);where said working means (12;12A;18) is able to take at least three different steady working positions (I,II,III) in function of the presence of supply to a first (5B) or a second (5A) or both said thermal actuators (5A,5B).According to the invention, said first thermal actuator (5B) is free to move with respect to said second thermal actuator (5A) and means (6A,11) are provided for transferring the thrust produced by the second thermal actuator (5A) to the first thermal actuator (5B), and causing a change in the reciprocal positioning of one thermal actuator with respect to the other.

Abstract: A PTC-element to be used as a protective device against overcurrent or overvoltage, of which the volume resistivity does not substantially differ before and after a high temperature processing, such as reflowing of solder, and can be preserved even after having been subjected to repeated tripping, which contains a non-conductive crystalline polymer and a particulate conductor material dispersed in the non-conducting crystalline polymer, wherein the particulate conductor material includes electro-conductive particles having irregular surface contours.

Abstract: A control device for a heater in a vehicle. The control device has a thermostatic switch to turn the heater on when the air temperature drops to a first value that is around the temperature at which the engine will just easily start. A secondary heater is provided within the device, turned on when the heater is turned on, to cause the switch to turn the heater off when the switch is heated by the secondary heater to a second temperature that correlates to an outside temperature at which the engine starts more easily.

Abstract: An electric blanket using an AC to DC converter circuit either alone or in combination with a shield mesh that surrounds the heating wire to substantially reduce the electromagnetic field produced by the heating wire. The electric blanket has a heating element having a conductive wire and a shielding component, in which the conductive wire is placed between the shielding component to substantially encase the conductive wire. To discharge any build up of electrical charges, the shielding component is coupled to the ground. The electric blanket also has a control device for use with the alternating electrical current. The control device has a temperature control circuit that controls the current flow pursuant to the temperature setting. A converter device used in the electric blanket is electrically connected to the outputs of the control device.

Abstract: A thermal protector having a fixed plate with a fixed contact point at one end, a movable plate having a movable contact point at a position corresponding to the fixed contact point. A bimetal plate which bends when a temperature exceeds a specified level deforms movable plate so as separate the contacts. There are first and second terminals connecting the fixed and movable plates with an external circuit and a heating element connected to the first and second terminals to maintain an open-circuited state. The heating element is flexible and is arranged so as to be deformed following the deformation of the bimetal plate and to always physically contact always with the bimetal plate.

Abstract: A temperature control system is shown in which a thermostat circuit is combined with a power supply to produce a higher anticipator current for a W1 signal while reducing power consumption and heat generation of the circuit. A first relay power signal is provided by an unbalanced bridge rectifier (D1, D2, D3, D4, D7, D8) while current drawn through the anticipator resistor (AR1) by means of an additional bridge rectifier circuit (D7, D8, D9, D10) is merged with the first relay power signal. In a second embodiment, an unbalanced bridge rectifier (D1, D4, D7, D2, D3, D8) has an output connected to a first stage relay power signal line as well as to second and third relay power signal lines.

Abstract: A compact protector device having a housing 10 with a fixed electrode 18 and terminal member 12 and a movable electrode 26 and terminal member 14 contained therein. The movable electrode 26 includes a thermostatic bimetal member 26a with a movable contact 28 attached thereto positioned to engage and disengage with a fixed contact 20 attached to the fixed electrode 18 upon action of the bimetal member 26c. A positive temperature coefficient (PTC) element 24 is positioned in direct heat transfer relationship with the bimetal member 26c and electrically connected between the fixed and movable electrodes 18, 26. The protector further includes an insulating member 22 for compressively holding the movable electrode 26 in electrical contact with the PTC element 24 and forming a fulcrum point for action of said bimetal member 26c.

Abstract: A thermally-actuated switch includes a pair of switch contacts openable or closeable in response to a change in the length of a shape memory metal (SMM) rod. The SMM rod is caused to change its length by having its temperature increased by heat produced when electrical power dissipated in a heating element that is coupled in electrical circuit with the switch contacts. To this end, the heating element is thermally coupled to the SMM rod, such as by a common heatsink. Where the switch is to be openable, the heating element is preferably in series circuit with the contacts, and where the contacts are closeable, the heating element is preferably in parallel therewith.

Abstract: A heat generator is formed to quickly raise the temperature of an object to be heated to a target level and then maintain the temperature of the object at the target level. The heat generator includes a high output heating element for heating the object to be heated, a temperature controller which is thermally coupled with the object and connected in series with the high output heating element for deenergizing the high output heating element when the temperature of the object exceeds the target level while energizing the high output heating element when the temperature of the object is reduced from the target level by a prescribed value, and a positive temperature coefficient thermistor which is thermally coupled with the object and connected in parallel with the high output heating element and the temperature controller, the thermistor having a Curie point set so as to produce an output capable of maintaining the object at the target temperature even when the high output heating element is deenergized.

Abstract: Circuit protection devices which comprise a PTC conductive polymer element and a second electrical component which is thermally coupled to the PTC element and which, when a fault causes the current in the circuit to become excessive, generates heat which is transferred to the PTC element, thus reducing the time taken to "trip" the PTC element. The second component is for example a voltage-dependent resistor which is connected in series with the PTC element under the fault conditions and is thus protected from damage. Alternatively, the second component is a thick film resistor which is connected in series with the PTC element.

Abstract: A safety cutout device for electric loads, particularly for use in pressing irons and portable heating apparatus, has a temperature switch, such as a bimetallic switch, which is adapted to be connected in series with the electric load. An electrical component adapted to be connected in parallel with the load and having an open and a closed switching state, and being normally open, is connected in series with a resistor adapted to be connected in parallel with the load and arranged in heat transfer relationship with the temperature switch and for heating the temperature switch to its operating temperature to open the switch. A further resistor, which continuously bridges and heats the temperature switch to an extent sufficient to maintain the temperature switch in its actuated open position, is connected in parallel with the temperature switch and adapted to be connected in series with the load.

Abstract: A heating unit (1) for a medium reservoir (2) provided e.g. as a fryer has a sheet metal, U-shaped support (3) with a plurality of continuous flow heater tubes (4) fixed rigidly between its legs provided as flange plates (5, 6) and is in this way constructed as a closed, preassembled unit, which can be subsequently fixed as an entity to the walls (11, 12) of a container in such a way that they on the one hand project freely into the container and on the other hand their electrically conducting parts are accessible from the outside. Directly above the outlets (29) of the tubes of the said heating unit (1) distributed in grid-like manner can be provided a separately heated sensor system (31) with several temperature sensors.

Abstract: Electronic control device of the electrical supply of a heating resistance (1) adapted to heat a cooking or grilling enclosure (2) such as, for example, the heating enclosure of a toaster. A detector (9) detects the temperature prevailing in the enclosure (2) and is electrically connected to an electronic timing circuit (7) adjustable according t a selected temperature (To) chosen by the user, and is adapted particularly to control the opening of a switch (5) mounted in series with the resistance (1). The detector (9) is mounted outside the enclosure (2) and comprises a variable resistance (10), for example a thermistor, which is in thermal relationship with a calibrated resistance (11), and which is electrically connectd to the timing circuit (7) so as to control this circuit. The thermal characteristics of the detector (9) are such that the timing circuit (7) controls the opening of the switch (5) practically at the instant at which the heating resistance (1) achieves the selected temperature (To).

Abstract: The control device (25) comprises a thermostat (15) interconnected between a supply source (S) and a heating resistor (4) which comprises two heating elements (41, 42), one of which (42) is supplied only during one of the heating regimes. A temperature limiter (18) is interconnected between the source (S) and the heating element (42). This temperature limiter is sensitive to the heat produced by a resistor (17) having a high resistance value so as to cut-off the supply of said heating element (42) at the time of initial opening of the switch (15a) of the thermostat (15). The device (25) is particularly applicable to electric convectors having a natural convection regime and a blowing regime.

Abstract: An active member can deform in accordance with its temperature. The active member is connected to a mechanically-operated valve member so that the operated member is driven in accordance with deformation of the active member. The temperature of the active member is adjusted to control the operated member.

Abstract: A thermostat controlled circuit for a bias heater located adjacent the thermostat connected to a source of alternating electrical power. The control circuit has a manually operated switch for providing a temperature level signal. A triac having a gate terminal and first and second terminals connected in series with the AC power source and the bias heater is provided. A transistor circuit controls the operation of the triac and is connected to the gate of the triac to provide a signal for turning on the triac periodically. The microprocessor supplies an enable signal to the transistor circuit at predetermined time intervals to cause the transistor circuit to activate the triac. The triac turns off at the next zero crossing of the AC line current after the microprocessor has removed the enable signal from the transistor circuit. The point in time of turning on the triac may be synchronous or asynchronous with the AC line current.

Abstract: Circuit protection devices which comprise a PTC conductive polymer element and a second electrical component which is thermally coupled to the PTC element and which, when a fault causes the current in the circuit to become excessive, generates heat which is transferred to the PTC element, thus reducing the time taken to "trip" the PTC element. The second component is for example a voltage-dependent resistor which is connected in series with the PTC element under the fault conditions and is thus protected from damage.

Abstract: An electric coffee maker has an electric flow-through brewing water heater with a heating resistor controlled by a temperature dependent regulating switch responsive to the temperature of the heating resistor, and a warming plate heated by the heating resistor for maintaining the prepared coffee at a desired drinking temperature. Apparatus for adjustably prolonging the interruption of heating current 2 to 5 times the normal cooling time of the regulating switch is connected in circuit with the heating resistor and the regulating switch, and a manually actuated small quantity control means connects the heating current interruption prolonging apparatus in circuit with the heating resistor and the regulating switch. The prolonging apparatus may be an adjustable auxiliary electric heater in parallel with the regulating switch and thermally coupled thereto or an adjustable timer in series with the heating resistor and regulation switch and triggered by the opening of the regulating switch.

Abstract: An insecticide dispenser capable of initiating the volatilization of a charge of insecticide to fumigate a room and then automatically shutting itself off during, or at the completion of the dispensing of the insecticide, whereby the dispenser can be safely left unattended during the fumigation of a room. The dispenser includes a container for the insecticide disposed upon a PTC heater, the elements being arranged adjacent a bimetal switching device that opens upon sensing a predetermined temperature, and can hold itself in the open position until intentionally reset. When the electrical circuit is open, the power supply to the PTC heater is broken and the heating will be discontinued.

Abstract: A system for electrically heating a hose of the type used to transport one or more fluid components from a remote location to a point of application includes at least one fluid conduit and an electric heating element enclosed within a thermal insulation blanket to form a hose construction having predetermined heat transfer characteristics. A remotely positioned module enclosed in a thermal insulation blanket and containing an electric heater and temperature sensor provides a hose simulator having heat transfer characteristics substantially identical to that of the hose. An electrical power drive circuit connected in parallel to the hose heating element and the module heater is controlled by a temperature control circuit responsive to the temperature sensed within the module by the temperature sensor. The temperature control circuit is further responsive to an ambient temperature sensor physically separated from the hose and module.

Abstract: A power control includes a thick film resistor on an electrically insulating support plate, for heating a bimetal strip operating switch contacts connecting power to a load, and to the resistor. The support plate is secured and the resistor thereon is electrically contacted by means of a resilient clip at one end, in the vicinity of a fixed end of the bimetal strip. An opposite end of the support is connected to a power source via a movable contact spring. An opposite free end of the bimetal strip acts directly on the switch contacts to disconnect power upon bending of the bimetal strip with heat. The bimetal strip and a control operator for biasing the bimetal strip are shaped like an L, with two legs pivotable around a pin adjacent the base of the bimetal strip.

Abstract: An automatic choke mechanism including an electrical heater and a circuit for energizing the heater so that the choke is opened first at a relatively rapid rate and later at a slower rate. The means for heating the choke comprises an N.T.C. device in series circuit with a P.T.C. heater and a temperature responsive shunting circuit for shunting the N.T.C.