Heating circuit

Abstract

The embodiment of the utility model provides a heating circuit. The heating circuit comprises a temperature detection unit, a driving unit, a hysteresis comparison unit and a heating unit. Wherein 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 is 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 on the basis that the driving unit is in the conducting state. The embodiment of the utility model is used for reducing the dependency of the heating circuit on a communication environment and the complexity of the circuit.

Description

Technical Field

[0001] This application relates to the field of electric heating, and more particularly to a heating circuit. Background Technology

[0002] In some devices, such as aircraft or vehicles operating in cold environments, heating circuits are required to ensure normal performance, such as fuel combustion efficiency or battery discharge efficiency. These circuits increase the temperature of the fuel injectors or the battery, ultimately improving energy utilization efficiency.

[0003] However, with the rapid development of electronic power technology, digital circuits have gained market favor. But incorporating digital circuits requires programming to achieve the relevant functions. Furthermore, the program requires collaboration and communication with a host computer during operation. This makes the realization of the electric heating function heavily dependent on the communication environment and the correct execution of the program, thus posing challenges to the safety and reliability of the equipment. At the same time, the implementation of digital circuits involves complex circuitry, longer research and development cycles, higher resource utilization, and higher costs.

[0004] Therefore, there is an urgent need for a heating circuit to improve the problems of existing electric heating in communication environments and circuit complexity. Summary of the Invention

[0005] In view of this, embodiments of this application provide an electric heating circuit to reduce the dependence of the heating circuit on the communication environment and the complexity of the circuit.

[0006] This application provides a heating circuit including: a temperature detection unit, a driving unit, a hysteresis comparison unit, and a heating unit. The temperature detection unit outputs a first voltage signal when the temperature of the environment where the heating circuit is located is lower than a preset low-temperature threshold. The driving unit is electrically connected to a first power supply. The hysteresis comparison unit, electrically connected between the driving unit and the temperature detection unit, enables the driving unit to be in a conducting state based on the received first voltage signal. The heating unit is electrically connected to the driving unit. Since the driving unit is in the conducting state, the heating unit is in a heating state.

[0007] In this embodiment, the temperature detection unit outputs a first voltage signal when the ambient temperature is below a low-temperature threshold. The hysteresis comparison unit controls the drive unit to be in a conducting state based on the first voltage signal. That is, the combination of the temperature detection unit and the hysteresis comparison unit enables the drive unit to automatically turn on when the ambient temperature is below the low-temperature threshold, thereby starting the heating unit to begin heating and achieving the heating purpose.

[0008] In one possible implementation of the first aspect, the temperature detection unit includes a thermistor and a first resistor; the first terminal of the thermistor is grounded, and the second terminal of the thermistor is electrically connected to the first terminal of the first resistor; the second terminal of the first resistor is used to electrically connect to a second power supply.

[0009] In this implementation, the resistance of the thermistor changes with temperature. The thermistor and the first resistor form a voltage divider circuit. When the ambient temperature changes, the resistance of the thermistor changes, thus causing a change in the sampling voltage at the node between the first resistor and the thermistor. Therefore, connecting the thermistor and the first resistor in series enables the conversion of a temperature signal into a voltage signal.

[0010] In one possible implementation of the first aspect, the temperature detection unit includes a first switch connected in parallel with the thermistor;

[0011] And / or,

[0012] The temperature detection unit includes a second switch, the first end of which is electrically connected to the second end of the thermistor, and the second end of which is used to be electrically connected to the second power supply.

[0013] In this implementation, the heating circuit can be forcibly terminated using the first switch, and the heating circuit can be forcibly started using the third switch, thereby increasing the controllability of the heating circuit.

[0014] In one possible implementation of the first aspect, the temperature detection unit further includes a third switch, which is connected in series with the first resistor between the thermistor and the second power supply.

[0015] In this implementation, when the third switch is closed, the connection between the second power supply and the first resistor and the thermistor is in a conductive state; when the third switch is open, the connection between the second power supply and the first resistor and the thermistor is in an open-circuit state.

[0016] In one possible implementation of the first aspect, the temperature detection unit further includes an operational amplifier; the second terminal of the thermistor is electrically connected to the first input terminal of the operational amplifier, and the second input terminal of the operational amplifier is electrically connected to the output terminal of the operational amplifier.

[0017] The operational amplifier can isolate its output from the sampling circuit composed of a thermistor and a first resistor, while reducing the output impedance of the temperature detection unit to obtain a more ideal voltage range.

[0018] In one possible implementation of the first aspect, the hysteresis comparison unit includes a hysteresis comparator and a first reference voltage generation module, with the first input terminal of the hysteresis comparator electrically connected to the output terminal of the first reference voltage generation module; and the second input terminal of the hysteresis comparator electrically connected to the output terminal of the temperature detection unit.

[0019] In this implementation, the hysteresis comparator activates the drive unit upon receiving the first voltage signal. The first reference voltage generation module generates a first reference voltage. The value of the first reference voltage can be set with reference to a low-temperature threshold or a high-temperature threshold.

[0020] In one possible implementation of the first aspect, the first reference voltage generation module includes: a first voltage divider resistor and at least two second voltage divider resistors; the at least two second voltage divider resistors are connected in parallel; the first voltage divider resistor and the second voltage divider resistors are connected in series between a power supply terminal and ground; the node between the first voltage divider resistor and the second voltage divider resistors is the output terminal of the first reference voltage generation module.

[0021] In this implementation, at least two second voltage divider resistors are connected in parallel. The parallel connection of the resistors can reduce the total resistance value, so that when the resistance value of the second voltage divider resistor is adjusted, the total resistance value can be changed less, thereby improving the adjustment accuracy.

[0022] In one possible implementation of the first aspect, the driving unit includes a driving control module and a driving module, wherein the input terminal of the driving control module is electrically connected to the output terminal of the hysteresis comparison unit, and the output terminal of the driving control module is electrically connected to the control terminal of the driving module, and the driving module is used to drive the heating unit.

[0023] In this implementation, the drive control module controls the drive module. For example, when the drive control module outputs a high level, the drive module is in the on state; when the drive control module outputs a low level, the drive module is in the off state.

[0024] In one possible implementation of the first aspect, the driving module includes: a transistor and a relay switch; the control terminal of the transistor is the control terminal of the driving 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.

[0025] In this implementation, when the drive control module controls the transistor to conduct, the coil of the relay switch is energized and controls the relay switch to close, thereby establishing a connection between the heating unit and the first power supply, and the heating unit is in a heating state.

[0026] In one possible implementation of the first aspect, the driving module includes a transistor connected in series with the heating unit, and the control terminal of the transistor is the control terminal of the driving module.

[0027] Secondly, embodiments of this application also provide a heating device, including the heating circuit provided in the first aspect.

[0028] Thirdly, embodiments of this application also provide an apparatus including the heating circuit provided in the first aspect.

[0029] In the heating circuit provided in this application embodiment, the temperature detection unit can output a first voltage signal when the ambient temperature is below a low-temperature threshold. The hysteresis comparison unit controls the drive unit to be in a conducting state based on the first voltage signal. That is, the combination of the temperature detection unit and the hysteresis comparison unit enables the drive unit to be automatically turned on when the ambient temperature is below the low-temperature threshold, thereby starting the heating unit to begin heating and achieving the heating purpose. The heating circuit provided in this application embodiment has a simple circuit structure, a high degree of automation, and high reliability. Furthermore, since the heating circuit provided in this application embodiment does not involve communication control with a host computer, it is free from dependence on the communication environment. Attached Figure Description

[0030] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 A block diagram of a heating circuit provided in an embodiment of this application;

[0032] Figure 2 This is a schematic diagram of the overall structure of a heating circuit provided in an embodiment of this application;

[0033] Figure 3 A schematic diagram of a temperature detection unit provided in an embodiment of this application;

[0034] Figure 4 A schematic diagram of a hysteresis comparison unit provided in an embodiment of this application;

[0035] Figure 5 A schematic diagram of a driving unit and a heating unit provided in an embodiment of this application;

[0036] Figure 6 This is a schematic diagram of a driving unit and a heating unit provided in an embodiment of this application.

[0037] Label Explanation

[0038] 100. Heating circuit; 110. Temperature detection unit; 111. Operational amplifier; 120. Drive unit; 121. Drive control module; 122. Drive module; 1211. Second comparator; 130. Hysteresis comparator unit; 131. Hysteresis comparator; 1311. First comparator; 132. First reference voltage generation module; 140. Heating unit; 141. Heater; 142. Indicator module. Detailed Implementation

[0039] To better understand the technical solution of this application, the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0040] It should be understood that the described embodiments are merely some, not all, of the embodiments in this application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0041] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0042] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0043] like Figure 1As shown, this application embodiment provides a heating circuit 100, including: a temperature detection unit 110, a driving unit 120, a hysteresis comparison unit 130, and a heating unit 140. The temperature detection unit 110 is used to detect temperature and convert the temperature information of the environment where the heating circuit is located into an electrical signal; the temperature detection unit 110 is also used to output a first voltage signal when the temperature of the environment where the heating circuit is located is lower than a preset low temperature threshold. It should be understood that when the temperature of the environment where the heating circuit is located is lower than the preset low temperature threshold, the output signal of the temperature detection unit 110 is the first voltage signal. The driving unit 120 is used to electrically connect to a first power supply VDD1; in one possible implementation, the driving unit 120 is electrically connected to a first power supply terminal, which is used to electrically connect to the first power supply VDD1. The first power supply VDD1 is used to provide power to the heating unit 140 through the driving unit. The hysteresis comparison unit 130 is electrically connected between the driving unit 120 and the temperature detection unit 110. The hysteresis comparator 130 is used to turn on the drive unit 120 based on the received first voltage signal; this should be understood as: when the hysteresis comparator 130 receives the first voltage signal, it controls the drive unit 120 to be in the turn-on state. The heating unit 140 is electrically connected to the drive unit 120; the heating unit 120 forms a connection line with the first power supply VDD1 through the drive unit 120. Based on the drive unit 120 being in the turn-on state, the heating unit 140 is in the heating state.

[0044] In this embodiment of the application, when the driving unit 120 is in the on state, the connection line between the heating unit 140 and the first power supply VDD1 is connected, so the heating unit 140 enters the working mode and is in the heating state.

[0045] This application provides a heating circuit in which a temperature detection unit 110 converts temperature information into an electrical signal and outputs a first voltage signal when the ambient temperature is below a low-temperature threshold. A hysteresis comparison unit 130 controls a drive unit 120 to be in a conducting state based on the first voltage signal. That is, the temperature detection unit 110 and the hysteresis comparison unit 130, combined, enable the drive unit 120 to automatically conduct when the ambient temperature is below the low-temperature threshold, thereby activating the heating unit 140 to begin heating, thus achieving the heating purpose. Furthermore, since the heating circuit provided in this application does not involve communication control with a host computer, it is free from dependence on a communication environment.

[0046] In one embodiment of this application, the temperature detection unit 110 is used to output a second voltage signal when the temperature of the environment where the heating circuit is located is higher than a preset high temperature threshold. The hysteresis comparison unit 130 is used to turn off the driving unit 120 based on the received second voltage signal. Based on the driving unit 120 being in the off state, the heating unit 140 is in a non-heating state.

[0047] In this embodiment, when the temperature of the environment where the heating circuit is located is higher than a preset high-temperature threshold, the output signal of the temperature detection unit 110 is a second voltage signal. After receiving the second voltage signal, the hysteresis comparison unit 130 controls the drive unit 120 to be in a turned-off state. When the drive unit 120 is in a turned-off state, the connection line between the heating unit 140 and the first power supply VDD1 is in an open circuit state. Therefore, the power supply to the heating unit 140 is disconnected, and the heating unit 140 is in a non-operating state and does not perform heating.

[0048] In this embodiment, the hysteresis comparison unit 130 is combined with the temperature detection unit 110 to automatically disconnect the drive unit 120 when the ambient temperature is higher than the high temperature threshold, thereby disconnecting the connection line between the heating unit 140 and the first power supply VDD1, so that the heating unit 140 does not heat externally. Therefore, the heating circuit provided in this embodiment can realize both automatic heating start-up at low temperatures and automatic heating stop-up at high temperatures, thereby improving the automation level of the heating circuit.

[0049] like Figure 2 As shown, in one embodiment of this application, the temperature detection unit 110 includes a thermistor RTC and a first resistor R1. The first terminal of the thermistor RTC is grounded, and the second terminal of the thermistor RTC is electrically connected to the first terminal of the first resistor R1. The second terminal of the first resistor R1 is used to electrically connect to a second power supply VDD2; in one possible implementation, the second terminal of the first resistor R1 is electrically connected to the second power supply VDD2 terminal, and the second power supply VDD2 terminal is used to electrically connect to the second power supply VDD2. In one possible implementation, the voltage values ​​of the second power supply VDD2 and the first power supply can be the same or different; therefore, the first power supply and the second power supply VDD2 can be the same power supply or different power supplies. In one possible implementation, the second power supply VDD2 is a DC voltage source, and its voltage value can be 5V.

[0050] In this embodiment, a voltage divider is formed between the thermistor RTC and the first resistor R1, thereby enabling signal acquisition at the node between the thermistor RTC and the first resistor R1. The resistance of the thermistor RTC changes with temperature; therefore, a voltage divider is achieved through the series connection of the thermistor RTC and the first resistor R1. When the ambient temperature changes, the thermistor RTC changes, thus altering the voltage division value at the node between the thermistor RTC and the first resistor R1, thereby converting ambient temperature information into a sampled voltage signal.

[0051] like Figure 2As shown, in one embodiment of this application, the temperature detection unit 110 includes a first switch K1, which is connected in parallel with a thermistor RTC. And / or, the temperature detection unit 110 includes a second switch K2, the first terminal of which is electrically connected to the second terminal of the thermistor RTC, and the second terminal of which is electrically connected to a second power supply VDD2; the second terminal of the second switch K2 is electrically connected to the second power supply VDD2 terminal, which is used to connect to the second power supply VDD2.

[0052] In this embodiment, the first switch K1 is connected in parallel with the thermistor RTC. When the first switch K1 is closed, the thermistor RTC is short-circuited, and the node voltage between the thermistor RTC and the first resistor R1 is pulled low to ground. The temperature detection unit 110 outputs a second voltage signal. Therefore, closing the first switch K1 can forcibly stop the heating state of the heating unit 140.

[0053] When the second switch K2 is closed, the voltage at the node between the thermistor RTC and the first resistor R1 is pulled up to the power supply voltage of the second power supply VDD2, thereby causing the temperature detection unit 110 to output a first voltage signal. Therefore, closing the second switch K2 can force the heating unit 140 to operate and put it into a heating state.

[0054] In one possible implementation, the first switch K1 and the second switch K2 can be mechanical switches, meaning they can be turned on or off directly by pressing a button. Compared to CNC switches, mechanical switches are simpler to implement and offer more stable performance.

[0055] In one possible implementation, the first switch K1 and the second switch K2 can be transistor switches. The control terminals of the first switch K1 and the second switch K2 are electrically connected to a control circuit, which controls the opening and closing of the first switch K1 and the second switch K2. Using transistor switches for the first switch K1 and the second switch K2 facilitates the integration of the temperature detection unit and reduces the overall board area.

[0056] In one embodiment of this application, the temperature detection unit 110 further includes a third switch K3. The third switch K3 and the first resistor R1 are connected in series between the thermistor RTC and the second power supply VDD2; that is, the third switch K3 and the first resistor R1 are connected in series between the thermistor RTC and the second power supply VDD2 terminal, and the second power supply VDD2 terminal is used for electrical connection to the second power supply VDD2.

[0057] In this embodiment, when the third switch K3 is closed, the connection between the second power supply VDD2 and the first resistor R1 and the thermistor RTC is in a conductive state; when the third switch K3 is open, the connection between the second power supply VDD2 and the first resistor R1 and the thermistor RTC is in an open-circuit state. This design allows the third switch K3 to close after the device is powered on and to close after the device is powered off (or disconnected), thereby preventing the first resistor R1 and the thermistor RTC from continuing to consume power after the device is powered off.

[0058] like Figure 3 As shown, in one possible implementation, the third switch K3 can be a transistor switch or a relay switch, thereby facilitating automatic closure when the device is powered on. The third switch K3 is controlled by a control circuit.

[0059] In one embodiment of this application, the temperature detection unit 110 further includes an operational amplifier 111. The second terminal of the thermistor RTC is electrically connected to the first input terminal of the operational amplifier 111, and the second input terminal of the operational amplifier 111 is electrically connected to the output terminal of the operational amplifier 111.

[0060] In this embodiment, the operational amplifier 111 is a follower operational amplifier, and the output voltage of the operational amplifier 111 follows the input voltage of the first input terminal of the operational amplifier 111. The operational amplifier 111 can isolate its output terminal from the sampling circuit composed of the thermistor RTC and the first resistor R1, and at the same time reduce the output impedance of the temperature detection unit 110 to obtain a more ideal voltage range, which corresponds to the temperature range between the high temperature threshold and the low temperature threshold.

[0061] like Figure 2 or Figure 3 As shown, in one embodiment of this application, the temperature detection unit 110 further includes a second resistor R2, a third resistor R3, a first capacitor C1, and a second capacitor C2. A thermistor RTC is connected in parallel with the first capacitor C1. The first terminal of the thermistor RTC is grounded, and the second terminal of the thermistor RTC is electrically connected to the first terminal of the first resistor R1. The second terminal of the first resistor R1 is used to electrically connect to a first power supply. The first terminal of the second resistor R2 is electrically connected to the first terminal of the first resistor R1, and the second terminal of the second resistor R2 is electrically connected to the first terminal of the third resistor R3. The second terminal of the third resistor R3 is electrically connected to the first input terminal of the operational amplifier 111, and the first input terminal of the operational amplifier 111 is grounded through the second capacitor C2.

[0062] In this embodiment, the second resistor R2 serves to shunt current, and the first capacitor C1 stabilizes the sampled voltage. The third resistor R3 and the second capacitor C2 form an RC filter voltage regulator circuit, which serves to filter and regulate the voltage, preventing the input voltage at the first input terminal of the operational amplifier 111 from fluctuating.

[0063] like Figure 2 As shown, in one embodiment of this application, the hysteresis comparison unit 130 includes a hysteresis comparator 131 and a first reference voltage generation module 132. The first input terminal of the hysteresis comparator 131 is electrically connected to the output terminal of the first reference voltage generation module 132. The second input terminal of the hysteresis comparator 131 is electrically connected to the output terminal of the temperature detection unit 110.

[0064] In this embodiment, the hysteresis comparator 131 can output a high level when it receives a first voltage signal and a low level when it receives a second voltage signal. This achieves the following: when the temperature is below a low-temperature threshold, the hysteresis comparator 131 outputs a high level, turning on the drive unit 120; when the temperature is above a high-temperature threshold, the hysteresis comparator 131 outputs a low level, turning off the drive unit 120. The first reference voltage generation module 132 is used to generate a first reference voltage. The voltage value of the first reference voltage can be set with reference to either the low-temperature threshold or the high-temperature threshold.

[0065] like Figure 4 As shown, in one embodiment of this application, the first reference voltage generation module 132 includes: a first voltage divider resistor RF1 and at least two second voltage divider resistors RF2. The at least two second voltage divider resistors RF2 are connected in parallel. The first voltage divider resistor RF1 and the second voltage divider resistors RF2 are connected in series between the power supply terminal 001 and ground. The node between the first voltage divider resistor RF1 and the second voltage divider resistors RF2 is the output terminal of the first reference voltage generation module 132. The power supply terminal 001 is used to electrically connect to a power source, for example, the power supply terminal 001 is used to electrically connect to a second power source VDD2.

[0066] In this embodiment, the first voltage divider resistor RF1 and the second voltage divider resistor RF2 form a voltage divider circuit, which generates a first reference voltage. The first reference voltage generation module 132 includes at least two second voltage divider resistors RF2 connected in parallel. The parallel connection of the resistors reduces the total resistance, thus allowing for smaller changes in the total resistance when adjusting the resistance of the second voltage divider resistors, thereby improving the adjustment accuracy. Therefore, at least two second voltage divider resistors RF2 connected in parallel can improve the adjustment accuracy of the first reference voltage, making it easier to adjust the voltage value of the first reference voltage to the target voltage value.

[0067] In the embodiments of this application, the second voltage divider resistor RF2 is merely a designation and not a limitation. It can be understood that different second voltage divider resistors RF2 may have the same or different resistance values.

[0068] like Figure 2 or Figure 4As shown, in one embodiment of this application, the hysteresis comparator 131 includes: a first comparator 1311, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, and a first pull-up resistor RH1. The fourth resistor R4, the fifth resistor R5, and the sixth resistor R6 are connected in series between the output terminal of the first comparator 1311 and the output terminal of the temperature detection unit 110. The first terminal of the first pull-up resistor RH1 is electrically connected to the output terminal of the first comparator 1311, and the second terminal of the first pull-up resistor RH1 is electrically connected to a third power supply terminal, which is used to electrically connect to a second power supply VDD2. The second input terminal of the first comparator 1311 is electrically connected to the node between the fifth resistor R5 and the sixth resistor R6.

[0069] In this embodiment, the fourth resistor R4, the fifth resistor R5, and the sixth resistor R6 are connected in series to adjust the temperature threshold. The second input terminal of the first comparator 1311 is electrically connected to the node between the fifth resistor R5 and the sixth resistor R6 to form a hysteresis loop, thereby ensuring that the output signal of the hysteresis comparator does not change when the ambient temperature is between the low temperature threshold and the high temperature threshold.

[0070] like Figure 2 As shown in Figure 4, in one embodiment of this application, the hysteresis comparison unit 130 further includes a third capacitor C3 and a fourth capacitor C4. The node between the fourth resistor and the fifth resistor R5 is grounded through the third capacitor C3. The fourth capacitor C4 is connected in parallel with the second voltage divider resistor RF2.

[0071] The third capacitor C3 and the fourth capacitor C4 are used for filtering and voltage regulation to prevent the input voltage between the two input terminals of the first comparator 131 from fluctuating.

[0072] like Figure 5 As shown, in one embodiment of this application, the drive unit 120 includes a drive control module 121 and a drive module 122. The input terminal of the drive control module 121 is electrically connected to the output terminal of the hysteresis comparison unit 130, and the output terminal of the drive control module 121 is electrically connected to the control terminal of the drive module 122. The drive module 122 is used to drive the heating unit 140.

[0073] In this embodiment, the drive control module 121 controls the drive module 122. For example, when the drive control module 121 outputs a high level, the drive module 122 is in the on state; when the drive control module 121 outputs a low level, the drive module 122 is in the off state.

[0074] like Figure 5As shown, in one embodiment of this application, the driving module 122 includes a transistor M1 and a relay switch Q1. The control terminal of the transistor M1 is the control terminal of the driving module 122. The coil of the relay switch Q1 is connected in series with the transistor M1, and the switch of the relay Q1 is connected in series with the heating unit 140.

[0075] In this embodiment, when the drive control module 121 controls the transistor to conduct, the coil of the relay switch Q1 is energized and controls the switch of the relay switch Q1 to close, thereby creating a connection between the heating unit 140 and the first power supply, and the heating unit 140 is in a heating state.

[0076] like Figure 6 As shown, in one embodiment of this application, the driving module 121 includes a transistor M1, which is connected in series with the heating unit 140, and the control terminal of the transistor M1 is the control terminal of the driving module 122.

[0077] In this embodiment, transistor M1 is a high-power transistor, such as a high-power MOSFET or a high-power bipolar transistor. Directly controlling the heating unit 140 by turning on transistor M1 facilitates the integration of the driving unit 120 and saves board space.

[0078] like Figure 6 As shown, in one possible implementation, the drive control module includes a seventh resistor R7, a second comparator 1221, a third voltage divider resistor RF3, a fourth voltage divider resistor RF4, a second pull-up resistor RH2, an eighth resistor R8, a ninth resistor R9, and a fifth capacitor C5 and a sixth capacitor C6. The seventh resistor R7 is electrically connected between the first input terminal of the second comparator 1221 and the output terminal of the hysteresis comparator unit 130. The first terminal of the third voltage divider resistor RF3 is electrically connected to the first power supply, and the second terminal of the third voltage divider resistor RF3 is grounded through the fourth voltage divider resistor RF4. The second terminal of the third voltage divider resistor RF3 is also electrically connected to the second input terminal of the second comparator 1221. The first terminal of the second pull-up resistor RH2 is electrically connected to the output terminal of the second comparator 1221, and the second terminal of the second pull-up resistor RH2 is electrically connected to the first power supply. The eighth resistor R8 and the ninth resistor R9 are connected in series between the output terminal of the second comparator 1221 and ground. The fifth capacitor C5 is connected in parallel with the ninth resistor R9. The sixth capacitor is connected in parallel with the fourth voltage divider resistor RF4. The node between the eighth resistor R8 and the ninth resistor R9 is electrically connected to the control terminal of the drive module.

[0079] In one embodiment of this application, the heating unit 140 includes a heater 141.

[0080] In one embodiment of this application, the heating unit 140 further includes an indicator module 142, which is connected in parallel with the heater 141. The indicator module 142 includes an indicator light and a tenth resistor R10, which are connected in series. The indicator light is an LED. The indicator light illuminates when the heating unit 140 is in a heating state, serving as an indicator.

[0081] It should be noted that, in the embodiments of this application, the first power supply VDD1 and the second power supply VDD2 can be the same power supply or different power supplies. When the first power supply VDD1 and the second power supply VDD2 are the same power supply, at least one of the second power supply terminal, the third power supply terminal, and power supply terminal 001 can be the same power supply terminal as the first power supply terminal.

[0082] The second power supply terminal, the third power supply terminal, and power supply terminal 001 can be the same power supply terminal or different power supply terminals.

[0083] The heating circuit provided in this embodiment is implemented using analog circuitry, eliminating the need for extensive programming and avoiding functional failures caused by program malfunctions, thereby improving reliability. Furthermore, since the heating function relies on hardware such as analog circuitry, it boasts high reliability and is independent of communication environments, making it suitable for a wider range of applications.

[0084] This application also provides a heating device, including at least one heating circuit provided in any of the foregoing embodiments.

[0085] The heating device provided in this application embodiment can automatically turn on the heating function when the ambient temperature is below the low temperature threshold and automatically turn off the heating function when the ambient temperature is above the high temperature threshold; it is convenient and intelligent to use.

[0086] In one embodiment of this application, the heating device includes at least two heating circuits. The at least two heating circuits are connected in parallel. The at least two heating circuits are connected in parallel and serve as backups for each other, preventing the entire heating device from failing to perform its heating function if one heating circuit malfunctions, thereby improving the stability of the heating device.

[0087] This application also provides a device, including at least one heating circuit and a heating device provided in the foregoing embodiments.

[0088] The device provided in this application embodiment can be an aircraft, a flying vehicle, a car, a ship, a terminal device, etc. The device provided in this application embodiment can realize the self-heating of the target heated object (fuel injector, battery, oil pipe, air pipe, water pipe, etc.) by using a heating circuit, which is simple and convenient.

Claims

1. A heating circuit, characterized in that, include: A temperature detection unit is used to output a first voltage signal when the temperature of the environment where the heating circuit is located is lower than a preset low temperature threshold. A drive unit, wherein the drive unit is used to electrically connect to a first power source; A hysteresis comparison unit is electrically connected between the driving unit and the temperature detection unit; the hysteresis comparison unit is used to put the driving unit into a conducting state based on the received first voltage signal; The heating unit is electrically connected to the driving unit; Since the driving unit is in the on state, the heating unit is in the heating state.

2. The heating circuit according to claim 1, characterized in that, The temperature detection unit includes a thermistor and a first resistor; the first end of the thermistor is grounded, and the second end of the thermistor is electrically connected to the first end of the first resistor; the second end of the first resistor is used to electrically connect to a second power supply.

3. The heating circuit according to claim 2, characterized in that, The temperature detection unit includes a first switch, which is connected in parallel with the thermistor. And / or, The temperature detection unit includes a second switch, the first end of which is electrically connected to the second end of the thermistor, and the second end of which is used to be electrically connected to the second power supply.

4. The heating circuit according to claim 2 or 3, characterized in that, The temperature detection unit also includes a third switch, which is connected in series with the first resistor between the thermistor and the second power supply.

5. The heating circuit according to claim 2, characterized in that, The temperature detection unit further includes an operational amplifier; the second terminal of the thermistor is electrically connected to the first input terminal of the operational amplifier, and the second input terminal of the operational amplifier is electrically connected to the output terminal of the operational amplifier.

6. The heating circuit according to claim 1, characterized in that, The hysteresis comparison unit includes a hysteresis comparator and a first reference voltage generation module. The first input terminal of the hysteresis comparator is electrically connected to the output terminal of the first reference voltage generation module. The second input terminal of the hysteresis comparator is electrically connected to the output terminal of the temperature detection unit.

7. The heating circuit according to claim 6, characterized in that, The first reference voltage generation module includes: a first voltage divider resistor and at least two second voltage divider resistors; the at least two second voltage divider resistors are connected in parallel; the first voltage divider resistor and the second voltage divider resistors are connected in series between the power supply terminal and ground; the node between the first voltage divider resistor and the second voltage divider resistor is the output terminal of the first reference voltage generation module.

8. The heating circuit according to claim 1, characterized in that, The drive unit includes a drive control module and a drive module. The input terminal of the drive control module is electrically connected to the output terminal of the hysteresis comparison unit, and the output terminal of the drive control module is electrically connected to the control terminal of the drive module. The drive module is used to drive the heating unit.

9. The heating circuit according to claim 8, characterized in that, The drive module includes: 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. The heating circuit according to claim 8, characterized in that, The driving module includes a transistor connected in series with the heating unit, and the control terminal of the transistor is the control terminal of the driving module.

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