Abstract: An apparatus and method for temperature-dependent transient blocking employing a transient blocking unit (TBU) that uses at least one depletion mode n-channel device interconnected with at least one depletion mode p-channel device. The interconnection is performed such that a transient alters a bias voltage Vp of the p-channel device and a bias voltage Vn of the n-channel device in concert to effectuate their mutual switch off to block the transient. The apparatus has a temperature control unit that is in communication with the TBU and adjusts at least one of the bias voltages Vp, Vn in response to a sensed temperature Ts, thereby enabling the apparatus to also respond to over-temperature. In some embodiments the p-channel device is replaced with a positive temperature coefficient thermistor (PTC). The temperature control unit can use any suitable circuit element, including, among other a PTC, resistor, negative temperature coefficient element, positive temperature coefficient element, transistor, diode.

Abstract: A high voltage over-current protection device includes a positive temperature coefficient (PTC) electrically conductive heat-dissipation layer and two metal electrodes. The PTC electrically conductive heat-dissipation layer includes at least one polymer, an electrically conductive filler, and a heat conductive filler. Due to the high thermal conductivity of the heat conductive filler (with a coefficient of thermal conductivity higher than 1 W/mK), the high voltage over-current protection device has a high thermal conduction characteristic, and the withstand voltage thereof can be substantially uniformly distributed in the PTC electrically conductive heat-dissipation layer to enhance its high voltage withstanding characteristic.

Abstract: A power supply apparatus includes an assembled battery including a plurality of cells, a plurality of temperature sensors sensing temperatures of the plurality of cells, respectively, a current sensor sensing a current flowing through the assembled battery, and a state monitoring unit and an abnormality detecting apparatus that are a detecting unit of detecting an abnormality of the plurality of temperature sensors. The detecting unit makes a notification of an abnormality, when charging or discharging of the assembled battery is performed and on a basis of a plurality of detections of the deviation being greater than a first prescribed value and the output fluctuation range being smaller than a second prescribed value.

Abstract: The present invention relates to a method of manufacturing surge arrestors, the method including stacking varistors; and forming a coating of composite material on the stack. Between these steps, also included is placing a bead of flexible, adhesive, and dielectric material on the previously formed stack in register with the various interfaces between each pair of adjacent varistors.

Abstract: A voltage source converter with a line-side diode rectifier, a load-side inverter with an electronic circuit, a power supply for the electronic circuit, and a slim DC link with a DC link capacitor is described. The slim DC link connects a DC output side of the line-side diode rectifier with a DC input side of the load-side inverter. A buffer capacitor is connected across the power supply, and a decoupling diode and a current limiting circuit are electrically connected in series with the buffer capacitor. The serially connected buffer capacitor, decoupling diode and current limiting circuit are connected in parallel with the DC link capacitor. This arrangement results in a voltage source converter that has an improved service reliability even in unstable power grids, without adding circuit complexity to the line input.

Abstract: A control system includes an enclosure, a control panel, and a plurality of controls, indicators, or both mounted on the control panel or in the enclosure. At least some of the plurality of controls, indicators, or both are configured to wirelessly communicate with each other inside the enclosure, and at least some controls including wirelessly controlled relays are configured to control devices outside the enclosure. Also, the wirelessly configured controls, indicators, or both are further configured to communicate with a plurality of other controls, indicators, or both in the control system.

Abstract: The over-current protection device of the present invention uses the unbalanced properties of the thermal expansion coefficients between the outer and inner sides for an upper metallic conductive sheet and a lower metallic conductive sheet to generate a torque to deform outwardly. The torque is used to pull a current-sensing element and present with at least a cracking face, so as to introduce an electrically open effect similar to a fuse. Thus, the present invention can achieve the object for preventing the danger of circuit system by the short circuit during the burning of over-current protection device.

Abstract: The present invention includes a system with a sensor to detect a change in one or more physical characteristics and provide a corresponding electrical sensor signal, a controller including a power source for the sensor, and transient suppression circuitry. This circuitry is coupled between the sensor and the power source of the controller, and includes a first thermistor to protect the sensor from a power surge from the controller and/or power source.

Abstract: An overcurrent protection circuit for low-voltage, high-current electrical systems comprises a Positive Temperature Coefficient (PTC) resistor in series with an auto-reset thermal breaker. The breaker allows for intermittent current within an assumed product usage duty cycle, and repeatedly trips and resets on sustained high current usage or during a short-circuit fault. The PTC resistor limits current in the system to a low value when the temperature rises to the PTC resistor's trip point. The PTC resistor protects the system from thermal damage during the non-breaker-tripped portions of sustained high current use, or during continuous low-current use. The use of both the PTC resistor and auto-reset breaker provides thermal overcurrent protection while allowing for performance claims based on an assumed duty cycle of product use.

Abstract: An overcurrent protection circuit for low-voltage, high-current electrical systems comprises a Positive Temperature Coefficient (PTC) resistor in series with an auto-reset thermal breaker. The breaker allows for intermittent current within an assumed product usage duty cycle, and repeatedly trips and resets on sustained high current usage or during a short-circuit fault. The PTC resistor limits current in the system to a low value when the temperature rises to the PTC resistor's trip point. The PTC resistor protects the system from thermal damage during the non-breaker-tripped portions of sustained high current use, or during continuous low-current use. The use of both the PTC resistor and auto-reset breaker provides thermal overcurrent protection while allowing for performance claims based on an assumed duty cycle of product use.

Abstract: A fault condition monitoring apparatus for use with a fuse cutout includes a housing operable to be supported by the fuse cutout. The housing has first and second contacts operable to make electrical contact with fuse contacts on the fuse cutout when the housing is supported by the fuse cutout. A current sensor is mounted inside the housing and is connected to the first and second contacts. A signaling device is coupled to the current sensor and is operable to cause a signal to be produced when current sensed by the current sensor meets a criterion.

Abstract: A secondary battery of the present invention a heat-sensitive element which varies in resistance value due to change of temperature is not placed on a path through which a charge or discharge current flows into or out of a storage battery. Accordingly, when a main switch element generates heat due to an overcurrent, a change in resistance value of the heat-sensitive element resulting from the heat will allow an auxiliary switch to be turned ON, thereby causing first and second auxiliary fuses to be blown. The charge or discharge current causes no power consumption at the heat-sensitive element, thereby providing high efficiency. The heat-sensitive element can be reduced in current capacity for use and it is suitable for compact design.

Abstract: A method and apparatus for improving the fault protection of a monitor circuit is provided by coupling an input protection circuit to an output section. The input protection circuit may include a fusible device that limits or removes a fault condition present at an input to the input protection circuit. The fusible device may be, for example, a resettable positive temperature coefficient (“PTC”) device configured to limit the current passing through it to a predetermined level once it reaches a predetermined temperature. A resistive element may be thermally coupled to the PTC device to assist in reaching the predetermined temperature. The monitor circuit may further be configured to generate a sensory signal in response to a fault condition.

Abstract: The output current of a ballast is dynamically limited when an over-temperature condition is detected in the ballast according to one of (i) a step function or (ii) a combination of step and continuous functions, so as to reduce the temperature of the ballast while continuing to operate it.

Abstract: A semiconductor switching element performs operations of bringing a current path from a power supply to a load into conduction and interrupting the path and is controlled by an operating-mode control circuit so as to operate in a first operating mode in which a conductive operation is shifted to an interrupt operation by using a change in resistance of a first positive-temperature-coefficient thermistor when the temperature of a temperature detection portion increases and reaches a predetermined interrupt temperature, and to be in a second operating mode in which the interrupt operation is shifted to the conductive operation by using a change in resistance of a second positive-temperature-coefficient thermistor when the temperature of the temperature detection portion decreases and reaches a return temperature, which is lower than the interrupt temperature by a predetermined value.

Abstract: An electrical component includes a mounting substrate, a common-mode rejection filter mounted to the substrate, and at least one circuit protection element mounted to or formed by the substrate. The circuit protection element may provide a PPTC resistor element for overcurrent protection and/or a spark gap NTC element for overvoltage protection. The substrate includes a plurality of contacts including filter contacts connected to the common-mode rejection filter, and protection contacts connected to the protection element, the electrodes enabling surface mounting and connection of the component to aligned connection features of a host printed circuit board.

Abstract: The semiconductor device is inserted between a power source and a load. A current flowing between an external drain terminal D and an external source terminal S is controlled in accordance with a control voltage applied between an external gate terminal G and the external source terminal S. In addition, the semiconductor device has a main MOSFET 1 and a detecting MOSFET 2 each of which is inserted between the external drain terminal D and the external source terminal S, a protective circuit 3 which protects the main MOSFET 1 by a protective transistor 5 when the abnormality is detected thereby, and an impedance element 4 inserted between the protective MOSFET 5, and a junction connecting the external gate terminal G to a gate electrode of the detecting MOSFET 2.

Abstract: An electrical device suitable for use in digital telecommunications applications is provided. The device includes a laminar PTC element composed of a conductive polymer composition sandwiched between two metal foil electrodes. A first insulating layer which is composed of an electrically insulating flexible material conforms to at least part of the perimeter of the PTC element. The device has low resistance, low capacitance, reduced size, and stable resistance, and can meet power cross testing requirements. In addition, assemblies of electrical devices are provided.

Abstract: A cooling apparatus for an integrated circuit. The cooling apparatus comprises cooling fan means, a control circuit and heat pipe means. The control circuit determines a spinning speed of the cooling fan and an operation performance mode of the integrated circuit according to the load and the temperature of the integrated circuit, the ambient temperature and a reference temperature. Within a tolerable range of the output of adder means, the heating pipe means continues dispelling heat of the integrated circuit without turning on the cooling fan. While the output of the adder means exceed the tolerable range, the fan is turned on to enforce the heat dissipation.

Abstract: An apparatus is disclosed that provides an estimate of the semiconductor junction temperature of a semiconductor device as a function of the electrical current flowing across the corresponding semiconductor junction. The apparatus includes a current sensor that samples and measures the current flowing across the semiconductor junction and provides an output signal indicative of the measured value to a current-to-temperature converter. The current-to-temperature converter estimates the temperature of the semiconductor junction using equations that include constants empirically derived for the particular device configuration including cooling and mounting methods used with it. The current-to-temperature converter provides an output temperature signal that is compared to a predetermined temperature threshold value, and in the event that the output temperature signal exceeds the predetermined temperature threshold value, an alarm signal is set.

Abstract: A power distribution panel having circuit elements such as KTK and GMT fuses removably mounted to a unit housing by means of module members, thereby allowing for ease of customization of the circuit elements of the power distribution panel.

Abstract: A circuit protection arrangement particularly useful in protecting battery assemblies. The arrangement contains a first PTC device which has a first switching temperature Ts1, has a resistance at 20° C. R1, has a hold current at a first specified temperature IH1, and is made from a first PTC resistive element composed of a first conductive polymer composition attached to first and second electrodes, and a second PTC device which is electrically connected in series with the first PTC device, has a second switching temperature Ts2 which is less than Ts1, has a resistance at 20° C. R2 which is less than R1, has a hold current at the first specified temperature IH2 which is greater than IH1, and is made from a second PTC resistive element composed of a second conductive polymer composition attached to third and fourth electrodes.

Abstract: An inductor obtained by laminating a plurality of ceramic layers having an internal coil conductor, and a thermistor obtained by laminating a plurality of ceramic layers having internal electrodes and having a predetermined resistance-temperature characteristic are laminated via an intermediate insulating layer. Both ends of the internal coil conductor of the inductor and the internal electrodes of the thermistor are connected to a pair of external electrodes. Thus, the inductor and the thermistor are connected in parallel.

Abstract: A circuit protection device (31) suitable for surface mounting on a substrate (19). The device has a laminar PTC resistive element (3) which is composed of a conductive polymer composition and is positioned between first and second electrodes (5,7). Attached to the first electrode is a first electrical terminal (33) containing an electrically conductive material which has a first attachment portion (35) connected to a first flexible portion (39) by means of a first connection portion (47). At least part of the first flexible portion is free of attachment to the first electrode. The first attachment portion is coplanar with at least one of the first connection portion and the first flexible portion. The first attachment portion may contain a slot (49) and a solid hinge portion (51).

Abstract: A circuit breaker includes separable contacts, a latchable operating mechanism having a latch member, a bimetal and an arc fault trip assembly. The trip assembly includes a thermistor responsive to bimetal temperature, an amplifier having first and second inputs and an output, a first resistor electrically connected between a second bimetal terminal and the first amplifier input, a second resistor electrically connected in parallel with the thermistor, a third resistor electrically connected in series with that parallel combination, with that series combination being electrically connected between the first amplifier input and the amplifier output. The second amplifier input is referenced to the first bimetal terminal. The amplifier output has a voltage, which is compensated for the bimetal temperature coefficient. The trip assembly provides a trip signal as a function of compensated voltage. A solenoid responds to the trip signal and releases the latch member to trip the separable contacts open.

Abstract: An over-current protection device comprises a positive temperature coefficient material layer, an upper electrode foil, a lower electrode foil, a first metal terminal layer, a second metal terminal layer and at least one insulating layer. The upper electrode foil is disposed on the upper surface of the positive temperature coefficient material layer, and the lower electrode foil is disposed on the lower surface of the positive temperature coefficient material layer. The first metal terminal layer electrically connects the upper electrode foil with at least one non-full-circular conductive through hole and at least one full-circular conductive through hole, and the second metal terminal layer electrically connects the lower electrode foil with at least one non-full-circular conductive through hole and at least one full-circular conductive through hole. The insulating layer isolates the upper electrode foil from the second metal terminal layer and the lower electrode foil from the first metal terminal layer.

Abstract: A fuse and filter arrangement having a polymer fuse apparatus that provides bypass fuse protection. A polymer bypass fuse includes of an electrical conductor wherein a portion of the conductor is surrounded by an internal electrode, which is then surrounded by a layer of polymeric positive temperature coefficient (PTC) material, which is then surrounded by a conductive material similar to that of the internal electrode. The fuse and filter arrangement includes a plurality of in-line and bypass fuses combined with a differential and common mode filter, which itself consists of a plurality of common ground conductive plates maintaining first and second electrode plates between the various conductive plates, all of which are surrounded by a material having predetermined electrical characteristics to provide fail safe filter and circuit protection.

Abstract: In a protection circuit for a plurality of fans, an element is associated with each fan. The impedance or the current value of the element indicates the operation condition of the fan. For example, the impedance or the current value may be low if the fan is operative or functioning normally, and high when the fan is inoperative or functioning abnormally. The elements are arranged in parallel between two conductive lines. A detection circuit determines the total impedance or current value between the two lines. If the total impedance or current is not within a predetermined range which indicates that all fans are operating normally, at least one of the fans functions abnormally. The number of lines required to convey the operation status of the fans to the detection circuit is only two and does not depend on the number of fans involved.

Abstract: An electrical device suitable for use in digital telecommunications applications is provided. The device includes a laminar PTC element composed of a conductive polymer composition sandwiched between two metal foil electrodes. A first insulating layer which is composed of an electrically insulating flexible material conforms to at least part of the perimeter of the PTC element. The device has low resistance, low capacitance, reduced size, and stable resistance, and can meet power cross testing requirements. In addition, assemblies of electrical devices are provided.

Abstract: A method for monitoring the operating temperature within a card shelf having a plurality of discrete electronic cards includes receiving a first temperature indicative of an operating temperature of an item on one of the electronic cards. A second temperature indicative of an ambient temperature in which the electronic card is operating is also received. Based on the first and second temperatures, a temperature controller determines whether the item is operating within specified limits.

Abstract: A rush current suppression circuit is used with a power supply circuit which includes a common line and an input voltage detection circuit and supplies power from an input power supply via a switching circuit. There is provided a smoothing capacitor coupled to an output end of the power supply circuit, and a rapid discharge and delay circuit coupled to the input voltage detection circuit and carrying out a rapid discharge and a time delay and controlling the switching circuit. The switching circuit includes two FETs which are coupled in series to the common line, and the two FETs have sources which are coupled to each other and gates which are coupled to each other and driven by the rapid discharge and delay circuit.

Abstract: A fused disconnect switch assembly includes a pull out fuse assembly and a switch housing assembly. The fuse assembly includes a line side conducting portion, a load side conducting portion, and a fuse element therebetween. The switch housing assembly includes a fuse receptacle for receiving the fuse, a first contact assembly coupled to the line side conducting portion of the fuse and a second contact assembly coupled to the load side conducting portion of the fuse when the fuse is inserted into the receptacle. An open fuse indication device is in communication with conducting portions of the fuse, and an alarm terminal output extends from the switch assembly housing and is in communication with the open fuse indication device. The open fuse indication device provides local fuse state indication and the alarm terminal output facilitates remote fuse state indication when coupled to external circuitry.

Abstract: Methods and systems are provided for a portable water heating system. The system comprises a housing with an inside and an outside, a water inlet disposed on the outside of the housing, a first hose nipple attached to the water inlet, the first hose nipple adapted to connect a water source to the system, a heating element adapted to heat water inside the housing, a lining disposed inside of the housing, the lining adapted to protect the inside of the housing from water corrosion, a water outlet disposed on the outside of the housing and a second hose nipple attached to the water outlet, the second hose nipple adapted to connect a fluid conduit for heated water distribution.

Abstract: An electrical device includes a package having an array of connections, a thermally conductive, electrically insulative substrate in the package, a plurality of polymeric positive temperature coefficient (PPTC) resistors in the package in thermal contact with the substrate, and, at least one heating element such as a power field effect transistor in thermal contact with the substrate, for indirectly heating the PPTC resistors in response to a control current, thereby to trip the PPTC resistors from a low resistance state to a very high resistance state. A method for controlling a plurality of electrical loads is also disclosed.

Abstract: The present invention relates to an over-current protecting apparatus, which comprises at least one PTC over-current protecting component and a body. The PTC over-current protecting component has a PTC material, electrodes covering the PTC material, and metal terminations electrically connected to the electrodes. The body has an insulating layer and a first conductive and second conductive regions covering the insulating layer. An end of the first conductive region and second conductive region are electrically connected to the metal terminations, and another ends of the first conductive and second conductive regions are mounted to a PCB. The metal material occupies over 20% area of the sidewall of the first conductive and second conductive regions for increasing solderability. Besides, the top of the PTC over-current protecting component can be adhered to another body to form a symmetrical bodies.

Abstract: The protective element 20A includes a first PTC element 1, as well as a low-melting-point metal member 2, a heat-generating member 3 and a second PTC element. A the PTC material 1′ constituting the first PTC element 1 serves as a substrate for the low-melting-point metal member 2, the heat-generating member 3 or the second PTC element. This protective element using the PTC element can be manufactured easily, with fewer components, and at lower costs. Moreover, the protective element can be made thinner.

Abstract: A method and apparatus for improving the fault protection of a monitor circuit is provided by coupling an input protection circuit to an output section. The input protection circuit may include a fusible device that limits or removes a fault condition present at an input to the input protection circuit. The fusible device may be, for example, a resettable positive temperature coefficient (“PTC”) device configured to limit the current passing through it to a predetermined level once it reaches a predetermined temperature. A resistive element may be thermally coupled to the PTC device to assist it reaching the predetermined temperature. The monitor circuit may further be configured to generate a sensory signal in response to a fault condition.

Abstract: A protection device includes a substrate capable of suppressing electromagnetic fields, with a channel formed therein, a current dependent circuit interrupter disposed inside the channel, and voltage management circuitry coupled to the substrate. The voltage management circuitry is electrically coupled to the current dependent circuit interrupter so as to form a crowbar circuit in the presence of overvoltage or undervoltage conditions as determined according to a reference voltage.

Abstract: An electromagnetic repulsion drive switching device in which a contact-closing coil and a contact-opening coil are arranged to confront a conductive repulsive member, and in which a drive current is fed to a selected one of the individual coils from a capacitor charged to a predetermined charge voltage by a charging power source. A stationary contact and a movable contact are brought into and out of contact by a repulsion electromagnetic force generated between the coils and the repulsion member. A voltage control controls the output voltage of the charging power source so that the peak value of the drive current may fall within a range with respect to a temperature change of the capacitor. As a result, even if the working temperature of the capacitor changes, the drive current of the contact-closing coil and the contact-opening coil falls within a desired range.

Abstract: A protective element includes at least three electrodes provided on one PTC material. The PTC material operates as at least two PTC elements. This protective element can be manufactured, with fewer components, in an easy manner, and at lower cost, and can cope with overcurrent and overvoltage.

Abstract: A thermal management system for a portable battery powered electronic device, and particularly, a portable battery powered ultrasound device, which controls the temperature of the device such that the external surface temperature satisfies medical safety regulatory requirements, and such that the heat generated by the device does not reduce battery life, reduce component life, decrease reliability of the device, or cause device shutdown because of overheating. A thermal management system monitors the respective temperatures of various system components, and, based on the monitored temperatures, performs control to cool the ultrasound system, maintaining the external surface temperature below the safety regulated temperatures and ensuring reliability of system components.

Abstract: The electric power breaker for breaking the electric power is placed on the midpoint of the electric power line from the battery power supply, and the electric power line is extracted from the electric power breaker. In addition, the electric power supply terminal is placed on the midpoint on the electric power line, from which the electric power is supplied to the individual electric load. The electric power distribution and the electric power supply operation to the electric loads are controlled by the multiplex communication. A semiconductor device having a self protection function is used as the switching device for supplying the electric power. The electric power line covered by the electric conductive material is arranged in a loop topology so as to start from the connection point to the battery and pass through the designated positions in the vehicle and return to the battery.

Abstract: An inductor obtained by laminating a plurality of ceramic layers having an internal coil conductor, and a thermistor obtained by laminating a plurality of ceramic layers having internal electrodes and having a predetermined resistance-temperature characteristic are laminated via an intermediate insulating layer. Both ends of the internal coil conductor of the inductor and the internal electrodes of the thermistor are connected to a pair of external electrodes. Thus, the inductor and the thermistor are connected in parallel.

Abstract: A circuit protection device suitable for welding to a battery terminal or other substrate without adverse affects caused by weld splatter. The device contains a laminar PTC resistive element, e.g. made from a conductive polymer composition, sandwiched between first and second electrodes. A first electrical lead has a first attachment portion having an attachment surface which is attached to the first electrode, a first connection portion which can be connected to an electrical circuit and is spaced away from the PTC element, and a first barrier portion. The first barrier portion is positioned on the first lead between the first attachment and first connection portions and extends toward the second electrode. During resistance welding, the barrier portion prevents weld splatter from contacting the PTC resistive element.

Abstract: The present invention is directed to a structure of a surface mounted resettable over-current protection device and a method for manufacturing the same. First, a raw material substrate having two ends is provided. On each of the two ends of the raw material substrate, a patterned conducting metal foil is formed. Then, the raw material substrate is cut to form a grid-shaped substrate having a plurality of strip-shaped structural parts. An insulating layer is formed to enclose the whole grid-shaped substrate, allowing parts of the patterned metal foil layers on the ends of the strip-shaped structural parts to be exposed. Next, the strip-shaped structural parts of the grid-shaped substrate are cut into a plurality of chips, each chip having two cut sections. Finally, two terminal electrodes are formed on the both cut sections of each chip.

Abstract: An electrical monitor circuit in which star points of taps on a first and a second side of a three-phase current limiting device are voltage compared. Possible applications are combinations with electrical switches, especially for power supplying and protecting circuits for electrical motors.

Abstract: A circuit protection arrangement particularly useful in protecting battery assemblies. The arrangement contains a first PTC device which has a first switching temperature Ts1 has a resistance at 20° C. R1, has a hold current at a first specified temperature IH1, and is made from a first PTC resistive element composed of a first conductive polymer composition attached to first and second electrodes, and a second PTC device which is electrically connected in series with the first PTC device, has a second switching temperature TS2 which is less than TS1, has a resistance at 20° C. R2 which is less than R1, has a hold current at the first specified temperature IH2 which is greater than IH1, and is made from a second PTC resistive element composed of a second conductive polymer composition attached to third and fourth electrodes.

Abstract: A circuit for indicating abnormality of a three-mode surge absorber of a public electric power is disclosed. The circuit is serially connected between the input end and output end of a public electric power supply for indicating the abnormality of a three-mode surge absorbing device of a public power supply so as to achieve the object of indicating an obvious indication to the users. The circuit includes a first surge absorbing device, a first three-end fuse, an abnormal indication circuit, a second surge absorbing device and a second two-end fuse. Other than indicating the abnormality of the L-N, L-G, N-G surge absorbing devices, the present invention can prevent current leakage as destroys occurs in the diverse modes.

Abstract: A temperature sensor for use in a circuit breaker is disclosed. The temperature sensor is included in the circuit breaker and detects temperature of a target within the current path of the breaker. If the temperature of the target falls within a preselected critical range, a trip signal is triggered in a trip processor board which actuates a solenoid to trip the circuit breaker. A bridge is provided in the current path to continue normal function of the circuit breaker outside the critical range of temperatures.

Abstract: A low loss diode ORing circuit has a feed input connected in series with a diode/transistor parallel network and the ouput. Heat is generated by the transistor when the transistor is turned on. A thermally conductive material (such as a heatsink) can dissipate heat and transfer heat from the transistor to the diode. The generated heat is transferred to the diode via the heatsink. As a result of the increased temperature of the diode and the diode's own negative temperature coefficient on conduction voltage, the diode's characteristic conduction threshold is reduced and the diode begins to conduct and share the current load as the current increases, thus providing minimal power dissipation as the current is routed to an output. A comparator may be used to monitor a voltage difference between the voltage level on the feed input and a voltage level on the output.