12 results about "Thermistor" patented technology

An improved heating system air pressure sensing port. An example aircraft pitot tube heater uses Positive Temperature Coefficient (PTC) switching thermistors arranged to automatically sense the outside air temperature and heat to a design set point temperature. When a high outside air temperature is experienced, the pitot tube will not turn on. The pitot tube heater only turns on below the design set point and will consumes less current than the standard aircraft pitot tube heaters when operating at very cold temperatures. Virtually no current is drawn when the pitot tube increases past the set point, thus reducing the power drain on the aircraft system. The use of multiple thermistors gives the example pitot tube a level of failure redundancy that is not available in current pitot tube heaters.

The invention belongs to the technical field of electronic devices, and particularly discloses a method for adjusting a resistance value of a negative temperature coefficient (NTC) thermistor chip. The method comprises the following steps of: (1) preparing a thermosensitive semiconductor ceramic powder; (2) molding, sintering and preparing an NTC thermosensitive ceramic chip; (3) coating an upper end electrode; (4) welding a lead wire; (5) aging; (6) adjusting the resistance value; and (7), encapsulating and testing. During the process of the adjustment method, an initial value of the NTC thermistor chip is undersized; the resistance value of the NTC thermistor chip during finely grinding can become large continuously and gradually; by precise control of the grinding quantity, the resistance value of the NTC thermistor chip can be controlled at 0.1 percent; under the condition of the resistance value precision of +/-0.3 percent during batch production, the qualification rate is up to 90 percent, so a precise resistance adjustment process of the NTC thermistor chip can be realized effectively, and the precision of the NTC thermistor chip is high; and the method can be widely applied to various temperature detection circuits, temperature compensation circuits, temperature control circuits and the like.

The invention discloses a temperature acquisition circuit of a thermistor and a self-checking method of the temperature acquisition circuit. The acquisition circuit comprises an MCU, a voltage dividing branch, a self-checking branch and a sampling filter capacitor. After the MCU controls the self-checking branch to be conducted, the acquisition circuit begins to execute a self-checking function; and when the condition that a difference value between actual sampling voltage and theoretical sampling voltage output by the voltage dividing branch is not in a preset difference value range is determined, a failure of the acquisition circuit is judged. Compared with a traditional acquisition circuit, the self-checking function is added to the acquisition circuit disclosed by the invention, and the failure of a sampling circuit can be timely found out through self-checking of the acquisition circuit, so that a technician can timely take effective measures, and the sampling error caused by the failure of the sampling circuit is avoided.

The invention relates to a resistance value testing device applied to thermistor testing. The device comprises a bearing assembly which is provided with a bearing substrate; the plurality of mountingassemblies are arranged on the bearing substrate side by side, each mounting assembly is provided with a mounting base and two conductive connecting parts, and the two conductive connecting parts arearranged on the mounting base; the selection assembly is provided with a first connecting terminal, a plurality of selection connecting ends and a selection part, one conductive connecting part in each mounting assembly is connected to the first connecting terminal, the plurality of selection connecting ends are connected with the other conductive connecting parts in the plurality of mounting assemblies in a one-to-one correspondence manner, and the selection part is selectively connected with one selection connecting end; and the test assembly is provided with a first access end and a secondaccess end, the first access end is connected to the first connecting terminal, and the second access end is connected to the selector. The resistance value of multiple thermistors can be assembled and tested at a time, the test efficiency is improved, the operation process is simple and convenient, and the test speed is high.

The optical module provided by the invention comprises a circuit board which is provided with a TEC control circuit, a TEC electrically connected with the TEC control circuit, a substrate mounted on the TEC in a surface mounting manner, at least three light-emitting components which are respectively mounted on the substrate, are electrically connected with the circuit board and are used for generating signal light, and at least two thermistors which are dispersedly arranged on the substrate wherein the thermistors are close to the light-emitting assemblies, the thermistors are connected with the TEC control circuit, and the number of the thermistors is smaller than that of the light-emitting assemblies; and the TEC control circuit obtains a detection voltage through the thermistors, and drives the TEC according to the detection voltage. The adjustment and control of the temperature of the plurality of groups of light-emitting assemblies are realized only by combining one TEC and the TEC control circuit with the plurality of thermistors, the complexity of a temperature control system in the multi-transmission-channel optical module is controlled, and the complex control circuit and huge power consumption of the TEC control circuit are avoided.

The invention discloses a high-stability thermistor manufacturing process which comprises the following steps: firstly, manufacturing an inner layer on a thermistor material, performing laser treatment on a side of a gong groove, pressing a prepreg with a copper foil, filling the gong groove with a resin, further performing laser treatment on the other side of the gong groove, pressing the prepregwith the copper foil, filling the gong groove with the resin, wrapping a thermistor inside the gong groove completely, and finally performing patterning, thereby obtaining a finished product of the thermistor. By adopting the high-stability thermistor manufacturing process, the thermistor is manufactured in modes that groove holes are formed through laser and mechanical means and the resin is repeatedly pressed and supplied, the thermistor is surrounded by the resin, very high reliability and stability are achieved, the characteristics that the resistance of a thermistor plate is increased incase of heat and large current and normal resistance is recovered after the heat and the current are recovered are met, then relatively high market requirements are met, and product diversity is achieved.

The invention discloses a thermocouple temperature measurement device and a temperature detection method. The device comprises a thermocouple, a conditioning module used for carrying out common-mode filtering processing of an analog hot end thermoelectric potential signal outputted by a hot end of the thermocouple, an analog-to-digital converter used for converting the analog hot end thermoelectric potential signal subjected to filtering processing into a digital hot end thermoelectric potential signal, a thermistor used for sensing the cold end temperature of the thermocouple, and a controller used for obtaining a cold-end thermoelectric potential according to the cold-end temperature of the thermocouple, obtaining a hot-end thermoelectric potential according to the digital hot-end thermoelectric potential signal, calculating a target thermoelectric potential according to the hot-end thermoelectric potential and the cold-end thermoelectric potential, and obtaining the hot-end temperature of the thermocouple according to the target thermoelectric potential. The device is advantaged in that the device can improve the anti-interference capability, guarantees high precision of temperature detection, achieves hot-end thermoelectric potential correction according to the hot-end thermoelectric potential and the cold-end thermoelectric potential of the thermocouple through employing an inverse temperature measurement algorithm, obtains the hot-end temperature of the thermocouple, is good in flexibility, and is wide in application range.

This motor is provided with: a motor main body which comprises a bottom part and a motor terminal 26 that is provided on the bottom part; and a terminal unit 200 which is fitted to the bottom part of the motor main body. The terminal unit 200 is provided with: a holder 210; a PTC thermistor 180 and a terminal part 330b, which are affixed to the holder 210; and a wiring part which electrically connects the motor terminal 26 and the terminal part 330b to each other. The PTC thermistor 180 is provided on the wiring part. The terminal part 330b and the PTC thermistor 180 are arranged so as to face each other in the radial direction.

The invention discloses an MCP form of a thermistor and a wireless body temperature detection circuit. A system is composed of a thermistor probe, a wireless body temperature detection circuit chip, a base material, an antenna, a fixing glue layer, a conductive pin and packaging filling bodies. The MCP structure comprises that the wireless body temperature detection circuit chip is fixed on the base material through the fixing glue layer, the conductive pin of the chip is connected with the antenna and the thermistor probe, and connection positions of the chip, the conductive pin, the antenna and the thermistor probe are wrapped by the packaging filling bodies. By the aid of the MCP form, the system is small in size, low in cost, simple to manufacture and easy to use.