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CN-224218526-U - Heating circuit

CN224218526UCN 224218526 UCN224218526 UCN 224218526UCN-224218526-U

Abstract

The embodiment of the application provides a heating circuit. The heating circuit comprises a temperature detection unit, a driving unit, a hysteresis comparison unit and a heating unit. The temperature detection unit is used for outputting a first voltage signal when the temperature of the environment where the heating circuit is located is lower than a preset low-temperature threshold value, the driving unit is used for being electrically connected with a first power supply, the hysteresis comparison unit is electrically connected between the driving unit and the temperature detection unit and used for enabling the driving unit to be in a conducting state based on the received first voltage signal, the heating unit is electrically connected with the driving unit, and the heating unit is in a heating state based on the fact that the driving unit is in the conducting state. The embodiment of the application is used for reducing the dependence of the heating circuit on the communication environment and the complexity of the circuit.

Inventors

  • WANG HE
  • QIN XIN
  • LIN SHUGANG

Assignees

  • 重庆金康动力新能源有限公司

Dates

Publication Date
20260508
Application Date
20250312

Claims (10)

  1. 1. A heating circuit, comprising: The temperature detection unit is used for outputting a first voltage signal when the temperature of the environment where the heating circuit is located is lower than a preset low-temperature threshold value; the driving unit is used for being electrically connected with the first power supply; The hysteresis comparison unit is used for enabling the driving unit to be in a conducting state based on the received first voltage signal; And the heating unit is electrically connected with the driving unit and is in a heating state based on the fact that the driving unit is in a conducting state.
  2. 2. The heating circuit of claim 1, wherein the temperature detection unit comprises a thermistor and a first resistor, wherein the first end of the thermistor is grounded, the second end of the thermistor is electrically connected with the first end of the first resistor, and the second end of the first resistor is electrically connected with a second power supply.
  3. 3. The heating circuit of claim 2, wherein the temperature detection unit comprises a first switch connected in parallel with the thermistor; and/or the number of the groups of groups, The temperature detection unit comprises a second switch, wherein the first end of the second switch is electrically connected with the second end of the thermistor, and the second end of the second switch is used for being electrically connected with the second power supply.
  4. 4. A heating circuit according to claim 2 or 3, wherein the temperature detection unit further comprises a third switch connected in series with the first resistor between the thermistor and the second power supply.
  5. 5. The heating circuit of claim 2, wherein the temperature sensing unit further comprises an operational amplifier, the second terminal of the thermistor is electrically connected to a first input terminal of the operational amplifier, and the second input terminal of the operational amplifier is electrically connected to an output terminal of the operational amplifier.
  6. 6. The heating circuit of claim 1, wherein the hysteresis comparison unit comprises a hysteresis comparator and a first reference voltage generation module, wherein a first input end of the hysteresis comparator is electrically connected with an output end of the first reference voltage generation module, and wherein a second input end of the hysteresis comparator is electrically connected with an output end of the temperature detection unit.
  7. 7. The heating circuit of claim 6, wherein the first reference voltage generation module comprises a first voltage dividing resistor and at least two second voltage dividing resistors, the at least two second voltage dividing resistors are connected in parallel, the first voltage dividing resistor and the second voltage dividing resistor are connected in series between a power supply terminal and ground, and a node between the first voltage dividing resistor and the second voltage dividing resistor is an output terminal of the first reference voltage generation module.
  8. 8. The heating circuit of claim 1, wherein the driving unit comprises a driving control module and a driving module, an input end of the driving control module is electrically connected with an output end of the hysteresis comparison unit, an output end of the driving control module is electrically connected with a control end of the driving module, and the driving module is used for driving the heating unit.
  9. 9. The heating circuit of claim 8, wherein the drive module comprises a transistor and a relay switch, the control terminal of the transistor is the control terminal of the drive module, the coil of the relay switch is connected in series with the transistor, and the switch of the relay is connected in series with the heating unit.
  10. 10. The heating circuit of claim 8, wherein the driving module comprises a transistor connected in series with the heating unit, and a control terminal of the transistor is a control terminal of the driving module.

Description

Heating circuit Technical Field The application relates to the field of electric heating, in particular to a heating circuit. Background In some devices, such as an aircraft or a vehicle in a cold environment, in order to ensure normal performance thereof, for example, in order to ensure combustion efficiency of fuel or discharge efficiency of a battery, etc., a heating circuit needs to be provided on the device to raise the temperature of an oil nozzle or the temperature of the battery, and ultimately to raise energy utilization efficiency. However, with the high-speed development of electronic power technology, digital circuits are popular in the market, but after the digital circuits are added, programs are required to be written to realize related functions, however, the programs need to cooperate and communicate with a host computer in the running process, so that the realization of the function of electric heating is seriously dependent on the communication environment and the correct execution of the programs, and thus, the safety and the reliability of equipment are challenged. Meanwhile, in the implementation process of the digital circuit, the circuit device is complex, the research and development period, the production period and the resource occupancy rate are long, and the cost is high. Therefore, a heating circuit is urgently needed to solve the problems of the existing electric heating on the communication environment, the complicated circuit and the like. Disclosure of Invention In view of the above, the embodiment of the application provides an electric heating circuit, so as to reduce the dependence of the heating circuit on the communication environment and the complexity of the circuit. The embodiment of the application provides a heating circuit which comprises a temperature detection unit, a driving unit, a hysteresis comparison unit and a heating unit. The temperature detection unit is used for outputting a first voltage signal when the temperature of the environment where the heating circuit is located is lower than a preset low-temperature threshold value, the driving unit is used for being electrically connected with a first power supply, the hysteresis comparison unit is electrically connected between the driving unit and the temperature detection unit and used for enabling the driving unit to be in a conducting state based on the received first voltage signal, the heating unit is electrically connected with the driving unit, and the heating unit is in a heating state based on the fact that the driving unit is in the conducting state. In this embodiment, the temperature detection unit is capable of outputting the first voltage signal to the outside when the ambient temperature is lower than the low temperature threshold. The hysteresis comparison unit controls the driving unit to be in a conducting state based on the first voltage signal. The temperature detection unit is combined with the hysteresis comparison unit, so that the driving unit is automatically conducted when the ambient temperature is lower than a low-temperature threshold value, and the heating unit is started to start heating, and the purpose of heating is achieved. In one possible implementation manner of the first aspect, the temperature detection unit includes a thermistor and a first resistor, a first end of the thermistor is grounded, a second end of the thermistor is electrically connected with a first end of the first resistor, and a second end of the first resistor is used for being electrically connected with a second power supply. In this implementation manner, the resistance of the thermistor changes with the change of temperature, and the thermistor and the first resistor form a voltage dividing circuit, so that the resistance of the thermistor changes when the ambient temperature changes, and the sampling voltage of the node between the first resistor and the thermistor changes. Therefore, the thermistor is connected in series with the first resistor to convert the temperature signal into a voltage signal. In a possible implementation manner of the first aspect, the temperature detection unit includes a first switch, and the first switch is connected in parallel with the thermistor; and/or the number of the groups of groups, The temperature detection unit comprises a second switch, wherein the first end of the second switch is electrically connected with the second end of the thermistor, and the second end of the second switch is used for being electrically connected with the second power supply. In the implementation mode, the first switch can be used for realizing forced termination of the heating circuit, and the third switch can be used for realizing forced operation of the heating circuit, so that the controllability of the heating circuit is improved. In a possible implementation manner of the first aspect, the temperature detection unit further includes a third switch, and the third switch and