34results about How to "Implement over temperature protection" patented technology

The invention relates to a step-down constant current LED drive circuit for automobile lighting. The circuit comprises an isolating circuit module (1), wherein the input end of the isolating circuit module (1) is electrically connected with a power supply (8), and the output end of the isolating circuit module (1) is electrically connected with an MOS transistor drive circuit module (2) and a converting circuit module (3); a Vin terminal of a PWM control chip (6) is electrically connected with the power supply (8), and a Vout terminal of the PWM control chip (6) is electrically connected with the MOS transistor drive circuit module (2) and the converting circuit module (3); the output end of the converting circuit module (3) is connected with an LED lamp set (9); one end of a feedback circuit module (5) is connected with the output of the converting circuit module (3) and the LED lamp set (9), and the other end of the feedback circuit module (5) is connected with an FB terminal of the PWM control chip; and a protection circuit module (4) is arranged between an earth terminal of the LED lamp set (9) and an SCP terminal of the PWM control chip. The drive circuit of the invention not only make the LED emit light constantly, but also has a short-circuit protection function, high rate of qualified products and low cost.

A semiconductor laser unit driving power supply with an over-temperature protection function comprises a precise reference source, a temperature detector, a temperature controller and a constant flow source driver, wherein the precise reference source provides precise reference voltage for the temperature detector and the constant flow source driver, the temperature detector detects temperature of a semiconductor laser unit and inputs a temperature signal to a temperature control system to generate a temperature control signal, and the temperature control signal controls the constant flow source driver to output a current. When the temperature is detected to be higher than or equal to T0, current of semiconductor laser unit is reduced, and therefore heat productivity and temperature of the semiconductor laser unit are reduced, and the semiconductor laser unit is effectively protected. When the temperature is detected to be lower than T0, driving current of the semiconductor laser unit stays the same.

The invention discloses a process deviation influence resisting over-temperature protection circuit. The circuit comprises a reference voltage input buffer stage, a resistor voltage division array, a negative temperature coefficient voltage branch circuit, a comparator and an output shaping circuit, wherein input reference voltage is buffered by the reference voltage input buffer stage to form reference voltage free from load influence; the reference voltage is divided by the resistor voltage division array so as to produce temperature setting voltage; the temperature setting voltage is output to the comparator, and is compared with voltage produced by the negative temperature coefficient voltage branch circuit in the comparator so as to produce a control signal; and the control signal is shaped and output by the output shaping circuit. The process deviation influence resisting over-temperature protection circuit can eliminate the influence of process deviation in the manufacturing process of an integrated circuit, accurately produces an actuating signal at a preset temperature point to control to switch off a protected circuit or an auxiliary circuit thereof, and realizes the over-temperature protection of the circuit.

The invention provides an IGBT junction temperature estimation system and method based on the temperature of an emitter power terminal. The system comprises a temperature measurement element, a temperature collection circuit, an IGBT gate driver, and a main controller, wherein the temperature measurement element is used for measuring the temperature of an IGBT power emitter terminal, the IGBT gatedriver comprises a gate drive and protection circuit and a temperature acquisition circuit, the gate drive and protection circuit is mainly used for on-off control and short circuit protection of a power device IGBT, the temperature acquisition circuit is used for acquiring a temperature signal, outputted by the temperature measurement element, on the IGBT power emitter terminal, and the main controller is used for sending a gate trigger signal to the IGBT gate driver, receiving a temperature signal on the IGBT power emitter terminal transmitted by the IGBT gate driver, and estimating the IGBT junction temperature according to the temperature signal on the IGBT power emitter terminal. According to the system, the over-temperature protection of the IGBT is realized, and IGBT temperature estimation is realized on the controller side.

The invention discloses a constant temperature antipriming device with a switching function; a temperature adjustment assembly comprises a first slide sleeve provided with a second water through hole connecting with a first water through hole; a water inlet is disconnected from the second water through hole when the first slide sleeve is sealed with a sealing member; the water inlet is connected with the second water through hole when the first slide sleeve is isolated from the sealing member; a switching assembly comprises a second slide sleeve capable of sliding relative to a fixed portion; the second slide sleeve is matched with the first water through hole, so the second water through hole can be switched with a first water outlet and a second water outlet, or can be simultaneously connected with the water outlets. The advantages are that the constant temperature antipriming device can preset an antipriming temperature through the temperature adjustment assembly; residual cold water in the device can be discharged so as to realize thermophilic antipriming function; a distance between the sealing member and the first slide sleeve can be adjusted so as to set a high temperature antipriming temperature, thus realizing over-temperature protection; in addition, the switching module can be adjusted so as to realize three switching functions, i.e, the first water outlet discharges water, the second water outlet discharges water, or the first and second water outlets simultaneously discharge water.

The invention discloses an overheat protection circuit which comprises a resistance voltage division array, a comparator, a negative temperature coefficient voltage branch circuit and an output shaping circuit, wherein the protection circuit works under stable supply voltage; the resistance voltage division array carries out voltage division on the supply voltage to generate setting potential for setting thermal shutoff threshold temperature; the setting potential is compared with the voltage generated by the negative temperature coefficient voltage branch circuit by the comparator to generate a control signal; and the control signal is shaped and output by the output shaping circuit. The overheat protection circuit provided by the invention can overcome the influence of process deviation in the manufacturing process of an integrated circuit, and accurately generates a shutoff signal at a preset temperature spot to control the shutoff of a protected circuit or an auxiliary circuit thereof, thus realizing overheat protection of the circuit. In addition, the protection circuit has no special requirements for the manufacturing process.

The invention relates to a highly-efficient light emitting diode (LED) power supply. The power supply comprises a bridge rectifier module and a switching power supply direct current-direct current (DC-DC) conversion module, wherein the output end of the bridge rectifier module is connected to an LED light source through the switching power supply DC-DC conversion module; and the switching power supply DC-DC conversion module comprises a secure sockets layer (SSL) 21083 chip. The highly-efficient LED power supply has the advantages that the work efficiency of the power supply is greatly improved, the size of the power supply is reduced, and the product cost is reduced by eliminating a transformer and an independent constant current control circuit; and the operating temperature of an LED is controlled, the over temperature protection of the LED light source is realized, and the service life of the power supply and a lamp is prolonged by an LED temperature compensation circuit of the power supply.

The invention relates to the field of an LED, and particularly to an over-temperature protection circuit and system for an LED lamp. The input voltage at an inverted input end of a first comparator is changed by a thermistor; meanwhile, the over-temperature protection for the LED lamp is realized by hysteretic characteristics formed by a feedback circuit formed by a fourth resistor that is connected between a first junction point and the output end of the first comparator in series; the invention also provides an over-temperature protection system for the LED lamp; a temperature signal is obtained through a temperature sensor; the input voltage input to a hysteretic temperature control unit is adjusted according to the temperature signal so as to control the operating on-off states of the LED lamp; and meanwhile, when the output voltage of the hysteretic temperature control unit is zero, a trigger signal is generated by a zero voltage trigger unit to trigger an alarm unit to sent out an alarm so as to realize the in-time over-temperature protection for the LED lamp.

The invention provides a switching power supply over-temperature protection circuit and an over-temperature protection method. The over-temperature protection circuit multiplexes a driving pin of a switching power supply controller to realize over-temperature protection. And when the drain-source end voltage of the main power tube of the switching power supply is stable, the over-temperature protection circuit is enabled. The over-temperature protection circuit can reuse the driving pin of the switching power supply controller to realize over-temperature protection, and an extra chip pin doesnot need to be arranged.

The embodiment of the invention provides a fan failure over-temperature protection method, device and system. The fan failure over-temperature protection method comprises the steps: firstly, the current temperature of a to-be-detected switch tube is obtained, then whether a fan loses efficacy or not is judged, if yes, the input amount of fan failure over-temperature protection is determined as thecurrent temperature, if not, the input amount of fan failure over-temperature protection is determined as a first preset value, the current temperature is used as the return difference of fan failureovert-temperature protection, and a threshold value of fan failure over-temperature protection is determined based on the current temperature; and then, whether the input amount is greater than the threshold value or not is judged, and if yes, over-temperature protection is carried out. It can be seen that according to the fan failure over-temperature protection method, the threshold value and the input amount are determined according to the detected current temperature and a fan failure state, over-temperature protection is triggered when the input amount is greater than the threshold value,the threshold value of over-temperature protection is determined by the current temperature and is not a fixed value, and thus the accuracy of over-temperature protection can be improved while a UPSafter a fan failure is subjected to over-temperature protection.

The invention provides a battery on-line monitoring method, device, equipment and system. The method comprises the steps: acquiring, in real time, first operation parameter data corresponding to at least one battery in a one-to-one mode and second operation parameter data corresponding to a battery pack comprising at least one battery; monitoring whether the first operation parameter data and thesecond operation parameter data are abnormal or not, and sending a first-stage alarm signal to an upper computer if the first operation parameter data and the second operation parameter data are abnormal; monitoring the variable quantities of the first operation parameter data and the second operation parameter data, and comparing the variable quantities with a first threshold value and a second threshold value respectively; and when the variable quantity of the first operation parameter data is greater than a first threshold value and the variable quantity of the second operation parameter data is greater than a second threshold value, sending a second-stage alarm signal to the upper computer, and meanwhile, cutting off battery power supply to realize fault protection. Compared with the prior art, the method has the advantages that the battery operation state can be monitored in real time, an alarm signal is sent in time to remind a user, battery power supply is cut off when a seriousfault occurs, and serious safety accidents are avoided. Besides, the battery temperature threshold value is monitored in real time, and the battery over-temperature protection is realized by monitoring the abnormality of the temperature variation of the battery in real time, so that the reaction is sensitive, the accuracy is high, and the misjudgment risk is greatly reduced.

The invention discloses a battery module, a battery and a laptop. The battery module comprises a cell, a protecting circuit board, a battery protecting chip and safety device, wherein the safety device comprises a first pin, a second pin and a third pin, the safety device comprises an insulating thermal-conduction substrate attaching to the cell, the first pin and the second pin are arranged on the insulating thermal-conduction substrate at interval and electrically connected through a fuse, a heat generating module is further connected to the insulating thermal-conduction substrate, the third pin is electrically connected with the heat generating module, the first pin and the second pin are serially connected into the charge and discharge main loop of the cell, and the third pin is electrically connected with the battery protecting chip. By the arrangement, the battery module has the advantages that controllable protection such as overcurrent protection, overtemperature protection and overcharge protection is achieved; the circuit is simplified through the safety device, the use amount of electronic components is reduced, the area of the protecting circuit board cab be further reduced, design flexibility is achieved, and the miniaturization and lightening of electronic equipment especially laptops are benefited.

The invention relates to the technical field of motor drive, in particular to a four-phase five-wire stepping motor drive IC. An abnormal condition can be protected, and the control difficulty is reduced. The four-phase five-wire stepping motor drive IC comprises a chip body, and the chip body is provided with a VCC pin, OUT pins, a GND pin and a control pin. The four-phase five-wire stepping motor drive IC is characterized in that the chip body comprises a Logic control module; the Logic control module is connected with the four OUT pins through four MOS tubes. The Logic control module is further connected with an OTP circuit, an OCP circuit and a UVLO circuit. The ULVO circuit is connected with the VCC pin; the control pin comprises a DIR pin and a PFM pin, the DIR pin is used for controlling the working state of the motor, the PFM is used for controlling the running speed of the motor, the PFM pin is directly connected with the Logic control module, and the DIR pin is connected withthe Logic control module through a Detect module.

The invention discloses a data communication method and a method and a system thereof for measuring and controlling a dual redundancy motor. The data communication method comprises the following steps: 1. Setting a communication protocol; 2. Double-cycle parallel data receiving and processing. The double redundancy motor measurement and control method comprises the following steps: 1. Communication protocol setting; 2. Data acquisition and transmission; 3. Data receiving and processing; The dual redundancy motor measurement and control system comprises a DSP digital processor module and a power supply circuit module, a reset circuit connected with the DSP digital processor module, a storage expansion circuit and a RS422/RS485 communication circuit. The dual redundancy motor measurement andcontrol system comprises a DSP digital processor module and a power supply circuit module. The input terminal of DSP digital processor module is connected with current detection circuit, voltage detection circuit, temperature detection circuit and RVDT solution circuit. The invention can stably, safely and reliably realize the coordinated control between the dual-redundancy servo motors and the data communication between the upper computer LabVIEW and the lower computer DSP module, which is convenient for popularizing and using.

The invention discloses an over-temperature protection device of a program-controlled temperature control system, which comprises a single-chip microcomputer, a digital temperature sensor, a heating driver and a heater, wherein the heating driver is electrically connected with the heater, an enabling end of the heating driver is mutually electrically connected with a trigger output end of the digital temperature sensor, and a control input end of the heating driver is electrically connected with an IO control port of the single-chip microcomputer; the over-temperature threshold is written intothe digital temperature sensor by the single-chip microcomputer or other digital controllers through a data bus, the level changes at one output port when the temperature measurement result of the digital temperature sensor exceeds the preset temperature threshold, the output port is connected with an enabling port of the heating driver, and the output of the heating driver is automatically closed when the level of the output port changes, so that the temperature of the heater is controlled to be always below the set threshold temperature, and the over-temperature protection for a heated object is realized.