Equipment heating circuit and server

Abstract

The invention discloses an equipment heating circuit and a server, and relates to the technical field of computers.The equipment heating circuit comprises a power switching circuit, a heating control circuit and a heating circuit, the first power input end of the power switching circuit is connected with a first power supply, and the second power input end of the power switching circuit is connected with a first battery module; the power supply switching circuit is used for switching to a power supply for supplying power to the heating circuit based on an equipment starting signal of equipment where the equipment heating circuit is located, when the equipment starting signal is at a high level, the first battery module is used for supplying power to the heating circuit, and when the equipment starting signal is at a low level, the first battery module is used for supplying power to the heating circuit. A first power supply is used for supplying power to the heating circuit; the heating control circuit comprises a first thermistor and is used for controlling the heating state of the heating circuit based on the first thermistor; and the heating circuit is used for heating the equipment where the equipment heating circuit is located based on the control of the heating control circuit.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of computer technology, and in particular, to a device heating circuit and a server. Background Art

[0002] At present, the application of some electronic equipment is developing in a more diverse and harsher direction. For example, in industrial sites, roadsides, water conservancy and other scenarios, electronic equipment that is used in low-temperature scenarios has higher requirements for the operating temperature of the chip inside the device. Otherwise, it is easy to cause equipment damage, affect normal business, and cause unnecessary losses.

[0003] When the device is used in low-temperature scenarios, a heating circuit (which may include heating components such as heating plates) is usually used for heating to ensure low-temperature startup. The heating circuit in the relevant technology uses a temperature sensor to read the temperature and controls the heating circuit switch through a microcontroller. However, when the ambient temperature is too low, the machine is prone to startup failure.

[0004] It can be seen that the device heating circuit in the related art has a technical problem that the success rate of machine startup is low when the ambient temperature is too low. Summary of the invention

[0005] The embodiments of the present application provide a device heating circuit and a server to at least solve the technical problem in the related art that the device heating circuit has a low success rate in starting the machine when the ambient temperature is too low.

[0006] According to one aspect of an embodiment of the present application, a device heating circuit is provided, comprising: a power switching circuit, a heating control circuit and a heating circuit, wherein a first power input terminal of the power switching circuit is connected to a first power supply, and a second power input terminal is connected to a first battery module, and the power switching circuit is used to switch to a power supply for powering the heating circuit based on a device start signal of a device where the device heating circuit is located, wherein when the device start signal is at a high level, the temperature of the first battery module is used to power the heating circuit, and when the device start signal is at a low level, the first power supply is used to power the heating circuit; the heating control circuit comprises a first thermistor, and the heating control circuit is used to control the heating state of the heating circuit based on the first thermistor; the heating circuit is used to heat the device where the device heating circuit is located based on the control of the heating control circuit.

[0007] In an exemplary embodiment, the power supply switching circuit includes: a first transistor and a second transistor. Wherein, the gates of the first transistor and the second transistor are both connected to a power supply control terminal, the power supply control terminal is the input terminal of the device start signal, the drains of the first transistor and the second transistor are both connected to the power supply output terminal of the power supply switching circuit, the power supply output terminal of the power supply switching circuit is the output terminal of the power supply for the heating circuit that is controlled to be turned on and off by the power supply switching circuit, the source of the first transistor is the first power supply input terminal, and the source of the second transistor is the second power supply input terminal.

[0008] In an exemplary embodiment, the power supply switching circuit includes: a first capacitor, a second capacitor, a third capacitor, and a fourth capacitor; wherein, the first capacitor and the second capacitor are connected in parallel, and one end of the parallel connection is grounded, and the other end of the parallel connection is connected between the first power supply and the source of the first transistor; the third capacitor and the fourth capacitor are connected in parallel, and one end of the parallel connection is grounded, and the other end of the parallel connection is connected between the first battery module and the source of the second transistor.

[0009] In an exemplary embodiment, the heating control circuit further includes: a first resistor, a second resistor, a third resistor, a voltage comparator, and a third transistor; wherein, one end of the first resistor is connected to the second battery module, and the other end is connected to the second resistor; one end of the second resistor is connected to the first resistor, and the other end is grounded; one end of the third resistor is connected to the third battery module, and the other end is connected to the first thermistor; one end of the first thermistor is connected to the third resistor, and the other end is grounded; the inverting input terminal of the voltage comparator is connected between the first resistor and the second resistor, the non-inverting input terminal is connected between the third resistor and the first thermistor, and the output terminal is connected to the gate of the third transistor; the source of the third transistor is connected to the output terminal of the power supply switching circuit, and the drain is connected to the heating circuit; wherein, when the resistance value of the first thermistor is higher than a first resistance value, the output level of the voltage comparator is a low level to turn on the third transistor, and when the resistance value of the first thermistor is lower than the first resistance value, the output level of the voltage comparator is a high level to turn off the third transistor; wherein, the second battery module and the third battery module are the same battery module or different battery modules, the output voltages of the second battery module and the third battery module are the same; the resistance values of the first resistor and the third resistor are the same, and the first resistance value is the resistance value of the second resistor.

[0010] In an exemplary embodiment, the heating control circuit further includes at least one of the following: a fifth capacitor, wherein one end of the fifth capacitor is connected between the positive power supply terminal of the voltage comparator and the fourth battery module, and the other end is grounded, and the negative power supply terminal of the voltage comparator is grounded; a fourth resistor, wherein the fourth resistor is connected between the output terminal of the voltage comparator and the gate of the third transistor.

[0011] In an exemplary embodiment, the heating control circuit further includes: a sixth capacitor and a fifth resistor, wherein the sixth capacitor and the fifth resistor are connected in parallel between the gate and the source of the third transistor.

[0012] In an exemplary embodiment, the device heating circuit further includes: a power supply cut-off circuit, the power supply cut-off circuit includes a second thermistor, a sixth resistor, a seventh resistor, a fourth transistor and an OR gate chip; wherein, one end of the second thermistor is connected to the sixth resistor, and the other end is grounded; one end of the sixth resistor is connected to the second thermistor, and the other end is connected to the fifth battery module; the gate of the fourth transistor is connected between the second thermistor and the sixth resistor, the drain is grounded, and the source is connected to the first input terminal of the OR gate chip; one end of the seventh resistor is connected to the sixth battery module, and the other end is connected between the source of the fourth transistor and the input terminal of the OR gate chip; the first input terminal of the OR gate chip is connected to the source of the fourth transistor, the second input terminal is connected to the output terminal of the voltage comparator, and the output terminal is connected to the gate of the third transistor; the power supply cut-off circuit is configured to turn off the fourth transistor based on the resistance value of the second thermistor being lower than a second resistance value. In the case where the fourth transistor is turned off, the input of the first input terminal is at a high level, the output of the OR gate chip is at a high level, and the third transistor is turned off to disconnect the power supply of the power supply switching circuit to the heating circuit, and the temperature at which the third transistor is turned off based on the resistance value of the second thermistor is higher than the temperature at which the third transistor is turned off based on the resistance value of the first thermistor.

[0013] In an exemplary embodiment, the device heating circuit further includes: a communication module; wherein, the communication module is connected between the source of the fourth transistor and the first input terminal, and the communication module is configured to send an abnormal alarm signal to a specified device in the case where the fourth transistor is turned off.

[0014] In an exemplary embodiment, the power supply cut-off circuit further includes: a seventh capacitor, wherein the seventh capacitor is connected in parallel between the gate and the drain of the fourth transistor.

[0015] According to another aspect of the embodiments of the present application, a server is further provided, and the server includes the device heating circuit described in any one of the above.

[0016] Through the present application, a method of supplying power to the heating circuit by using two power sources is adopted. The device heating circuit includes: a power supply switching circuit, a heating control circuit, and a heating circuit. Among them, the first power supply input terminal of the power supply switching circuit is connected to the first power supply, and the second power supply input terminal is connected to the first battery module. The power supply switching circuit is used to switch the power supply for the heating circuit based on the device start signal of the device where the device heating circuit is located. Among them, when the device start signal is at a high level, the first battery module is used to supply power to the heating circuit at a certain temperature, and when the device start signal is at a low level, the first power supply is used to supply power to the heating circuit; the heating control circuit includes a first thermistor, and the heating control circuit is used to control the heating state of the heating circuit based on the first thermistor; the heating circuit is used to heat the device where the device heating circuit is located based on the control of the heating control circuit. Since the battery module is used to supply power to the heating circuit when the machine starts, compared with the power supply on the board, the battery module is less affected by temperature. It can pre-heat the machine when the machine starts at a low temperature, ensure the normal start of the machine, and achieve the technical effect of improving the success rate of machine start in low-temperature scenarios. Furthermore, it solves the technical problem that the success rate of machine start is low when the environmental temperature is too low in the device heating circuit in the related art. In addition, after the machine starts, the switched power supply can reduce the machine's dependence on the traditional power supply and improve the stability and reliability of the machine operation; and the heating control circuit controls the heating state of the heating circuit based on the thermistor. Compared with collecting temperature data based on a temperature sensor and parsing the data by a microcontroller, and then controlling the heating circuit, it can ensure the normal switching of the heating circuit at the hardware level and avoid the situation of the heating circuit getting out of control when the microcontroller program fails, improving the safety of the machine operation. Brief Description of the Drawings

[0017] In order to more clearly illustrate the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0018] Figure 1 It is a schematic structural diagram of an optional device heating circuit according to an embodiment of the present application;

[0019] Figure 2 It is a schematic structural diagram of an optional power supply switching circuit according to an embodiment of the present application;

[0020] Figure 3It is a schematic diagram of an optional power supply switching circuit according to an embodiment of the present application;

[0021] Figure 4 It is a schematic structural diagram of another optional power supply switching circuit according to an embodiment of the present application;

[0022] Figure 5 It is a schematic diagram of another optional power supply switching circuit according to an embodiment of the present application;

[0023] Figure 6 It is a schematic structural diagram of an optional heating control circuit according to an embodiment of the present application;

[0024] Figure 7 It is a schematic diagram of an optional low-temperature heating circuit according to an embodiment of the present application;

[0025] Figure 8 It is a schematic structural diagram of another optional heating control circuit according to an embodiment of the present application;

[0026] Figure 9 It is a schematic diagram of an optional heating control circuit according to an embodiment of the present application;

[0027] Figure 10 It is a schematic structural diagram of yet another optional heating control circuit according to an embodiment of the present application;

[0028] Figure 11 It is a schematic diagram of another optional heating control circuit according to an embodiment of the present application;

[0029] Figure 12 It is a schematic structural diagram of an optional power supply cut-off circuit according to an embodiment of the present application;

[0030] Figure 13 It is a schematic diagram of an optional high-temperature cut-off circuit according to an embodiment of the present application;

[0031] Figure 14 It is a schematic structural diagram of another optional device heating circuit according to an embodiment of the present application;

[0032] Figure 15 It is a schematic diagram of an optional device heating circuit according to an embodiment of the present application;

[0033] Figure 16 It is a schematic structural diagram of another optional power supply cut-off circuit according to an embodiment of the present application. Detailed implementation manners

[0034] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0035] It should be noted that, in the description of this application, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. The terms "first", "second", etc. in this application are used to distinguish similar objects, and are not used to describe a specific order or sequence.

[0036] In order to enable those skilled in the art to better understand the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0037] According to one aspect of an embodiment of the present application, a device heating circuit is provided. The device heating circuit can be applied to a server (for example, an edge server) or a similar electronic device, where an edge server refers to a server located at the edge of a network, close to a data source, and is usually deployed closer to a user. Taking the application to a server as an example, with the widespread deployment of digital infrastructure, the application scenarios of servers (especially edge servers) have gradually expanded from a single business environment to multiple fields such as industry, transportation, water conservancy, and medical care, especially in scenes with harsh environmental conditions such as industrial sites, roadsides, and water conservancy. These scenarios are often accompanied by extreme temperature changes, especially low temperature environments, which put higher requirements on the hardware performance of the device. At low temperatures, key components such as chips, hard disks, and memory inside the server may not be able to start or run normally due to low temperatures, which directly affects the stability and business continuity of the server.

[0038] For this reason, when the server is used in a low-temperature scenario, a heating circuit is often required for heating to ensure low-temperature startup. The heating circuit may include heating components such as heaters, heating sheets, and heating films that can heat the device, and may also include wires for connecting to other circuits. At present, most heating circuits use temperature sensors to read the temperature and control the switch of the heating circuit through the MCU (Micro-controller Unit) (that is, turning the heating circuit on and off, or turning the heating circuit on and off). However, when the ambient temperature is too low, the machine is prone to startup failure.

[0039] In order to at least partially solve the above technical problems, in this embodiment, a device heating circuit is provided. When the machine starts up, the battery module is used to supply power to the heating circuit. Compared with the power supply on the board, the battery module is less affected by temperature. When the machine starts up at low temperature, the machine can be pre-heated to ensure the normal start-up of the machine and improve the success rate of the machine start-up in low-temperature scenarios.

[0040] Figure 1 It is a schematic structural diagram of an optional device heating circuit according to an embodiment of the present application. As Figure 1 shown, the circuit may include: a power supply switching circuit 101, a heating control circuit 102, and a heating circuit 103. Among them, the power supply switching circuit 101 is a circuit for switching the power supply for supplying power to the heating circuit 103. The heating control circuit 102 is a circuit for controlling the switch of the heating circuit 103, and the heating circuit 103 is a circuit for heating the device where the device heating circuit is located. It can be switched on and off based on the control of the heating control circuit 102. Here, the switch of the heating control circuit 102 can be realized by turning on or off the power supply for supplying power to the heating control circuit 102. Turning on or off the power supply for supplying power to the heating control circuit 102 can be realized by hardware. For example, it can be realized by an electronic device with a switching function.

[0041] The power supply switching circuit 101 has at least two power supply input terminals, including a first power supply input terminal and a second input terminal. The first power supply input terminal is connected to the first power supply, and the second power supply input terminal is connected to the first battery module. The power supply switching circuit 101 can be used to switch the power supply for supplying power to the heating circuit based on the device start signal of the device where the device heating circuit is located. The device start signal (POWER_ON) is a signal used to indicate the start of the device. When the device start signal is at a high level, the temperature of the first battery module is used to supply power to the heating circuit. When the device start signal is at a low level, the first power supply is used to supply power to the heating circuit.

[0042] The first power supply can be a stable external power supply, such as an on-board power supply. It can provide sufficient voltage and current to meet the requirements of the device under normal working conditions, can provide a more stable and more economical power supply, reduce the dependence on battery resources, extend the battery life, and at the same time reduce the energy waste and cost increase caused by frequent charging and discharging of the battery. The first power supply can be a 12V power supply, a P3V3 (3.3V power supply voltage) power supply. The first battery module can be a battery with good low-temperature performance (such as a lithium battery or other power supply batteries), and it can be a 12V_BAT (12V power supply battery), a P3V3_BAT (3.3V power supply battery), etc. Exemplarily, 12V_BAT and 12V can be used to supply power to the heating sheet.

[0043] The heating control circuit 102 includes a first thermistor. The heating control circuit 102 is used to control the heating state of the heating circuit 103 based on the first thermistor. Based on the heating requirements of the device, for example, the temperature threshold for heating the device, a suitable thermistor is selected. Thermistors can be divided into NTC (Negative Temperature Coefficient thermistor) and PTC (Positive Temperature Coefficient thermistor). The first thermistor can be an NTC or a PTC. The resistance value of the first thermistor changes with temperature, and it can be realized that when the required temperature meets certain resistance conditions, thereby realizing the automatic control of the heating state of the heating circuit. Here, the heating state of the heating circuit can be two types: on or off.

[0044] It should be noted that in the related art, the device heating circuit often uses a temperature sensor to read the temperature, relying on the software control of the MCU. By analyzing the sensor data and controlling the switch of the heating circuit. However, the MCU may have defects or be interfered by the outside world, resulting in incorrect program execution, unable to correctly judge the temperature condition or unable to control the heating circuit in time, thus causing the continuous operation of the heating circuit, resulting in too high temperature inside the device, causing the board to burn out or the system to fail. In this embodiment, the switch control of the heating circuit based on the thermistor can realize the switch control of the heating circuit at the hardware level, ensure the normal switch of the heating circuit, and realize that when the MCU program fails and the heating circuit gets out of control, the heating can be automatically disconnected.

[0045] Through the embodiments provided by this application, a device heating circuit is provided, including: a power supply switching circuit, a heating control circuit, and a heating circuit. Among them, the first power input terminal of the power supply switching circuit is connected to the first power supply, and the second power input terminal is connected to the first battery module. The power supply switching circuit is used to switch the power supply for the heating circuit based on the device start signal of the device where the device heating circuit is located. Among them, when the device start signal is at a high level, the first battery module is used to supply power to the heating circuit, and when the device start signal is at a low level, the first power supply is used to supply power to the heating circuit; the heating control circuit includes a first thermistor, and the heating control circuit is used to control the heating state of the heating circuit based on the first thermistor; the heating circuit is used to heat the device where the device heating circuit is located based on the control of the heating control circuit, solving the technical problem that the device heating circuit in the related art has a low success rate of machine startup when the ambient temperature is too low, and improving the success rate of machine startup.

[0046] In an exemplary embodiment, such asFigure 2 As shown in Figure 2 , the power supply switching circuit 101 includes: a first transistor 1011 and a second transistor 1012. Among them, the gates of the first transistor 1011 and the second transistor 1012 are both connected to the power supply control terminal, and the power supply control terminal is the input terminal of the device start signal. The drains of the first transistor 1011 and the second transistor 1012 are both connected to the power supply output terminal of the power supply switching circuit 101. The power supply output terminal of the power supply switching circuit 101 is the output terminal of the power supply for the heating circuit 103, which is controlled by the power supply switching circuit 101 to be turned on and off. The source of the first transistor 1011 is the first power supply input terminal, and the source of the second transistor 1012 is the second power supply input terminal.

[0047] The first transistor 1011 and the second transistor 1012 can be transistors with switching functions, and they can both be MOS (Metal-Oxide-Semiconductor) transistors. An MOS transistor is a semiconductor device that can be used to amplify or switch electronic signals. It is a commonly used transistor, which includes a source, a drain, and a gate. Based on the field effect, that is, the current flow between the source and the drain can be controlled by applying a voltage. When the gate voltage reaches a certain threshold, a conductive channel will be formed on the semiconductor surface, thereby allowing current to pass through.

[0048] In this embodiment, the first transistor 1011 and the second transistor 1012 can control the switching of the power supply for the heating circuit 103 according to the device start signal of the power supply control terminal (the input terminal of the device start signal). Among them, the gates of the first transistor 1011 and the second transistor 1012 are both connected to the power supply control terminal, and the drains of the first transistor 1011 and the second transistor 1012 are both connected to the power supply output terminal of the power supply switching circuit 101. Here, the power supply output terminal of the power supply switching circuit 101 is the output terminal of the power supply for the heating circuit 103, which is controlled by the power supply switching circuit 101 to be turned on and off, that is, the power supply for the heating circuit 103 is controlled by the power supply switching circuit 101 to be turned on and off (switched), and the power supply output terminal of the power supply switching circuit 101 is the output terminal of the power supply for the heating circuit 103. Among them, the source of the first transistor 1011 is the first power supply input terminal, and the source of the second transistor 1012 is the second power supply input terminal.

[0049] Optionally, different types of MOS transistors can be selected as the first transistor and the second transistor. Here, for different semiconductor materials, their conduction channels are composed of different carriers. Correspondingly, MOS transistors can be divided into PMOS transistors and NMOS transistors. Among them, an NMOS transistor conducts when a positive voltage is applied between the gate and the source, and a PMOS transistor conducts when a negative voltage is applied between the gate and the source. PMOS transistors can be selected as the first transistor and the second transistor. When the device start signal is high level (corresponding to when the device starts), the second transistor conducts, while the first transistor is cut off; when the device start signal is low level (corresponding to when the device has started), the first transistor conducts, while the second transistor is cut off.

[0050] For example, as Figure 3 shown, Q1 (an example of the first transistor) and Q2 (an example of the second transistor) are PMOS transistors, which are used for the switching between P12V and P12V_BAT. When the machine needs to start at low temperature and the ambient temperature is too low, preheating is performed at this time, POWER_ON is high, and the heating element is powered by P12V_BAT; when the machine is powered on, POWER_ON is low, and at this time the heating element is powered by P12V instead. This design can avoid the situation of machine startup failure when the ambient temperature is too low, and at the same time can reduce the machine's dependence on the traditional power supply.

[0051] Through this embodiment, by using the first transistor and the second transistor to switch the power supply for the heating circuit according to the device start signal of the power control terminal, not only can the situation of machine startup failure when the ambient temperature is too low be avoided, but also the machine's dependence on the traditional power supply can be reduced, and the reliability of the power supply switching can be improved (the performance of the transistor has better stability compared with other devices).

[0052] In an exemplary embodiment, as Figure 4 shown, the power switching circuit 101 includes: a first capacitor 1013, a second capacitor 1014, a third capacitor 1015, and a fourth capacitor 1016; wherein, the first capacitor 1013 and the second capacitor 1014 are connected in parallel, and one end of the parallel connection is grounded, and the other end of the parallel connection is connected between the first power supply and the source of the first transistor 1011; the third capacitor 1015 and the fourth capacitor 1016 are connected in parallel, and one end of the parallel connection is grounded, and the other end of the parallel connection is connected between the first battery module and the source of the second transistor 1012.

[0053] In this embodiment, the power switching circuit may include capacitors for filtering and smoothing the voltage. Two capacitors (i.e., the first capacitor 1013 and the second capacitor 1014) can be selected in parallel. They are commonly connected between the first power supply and the source of the first transistor 1011, and one end of the parallel connection is grounded. This configuration can filter out the high-frequency noise of the first power supply, ensuring that when the heating circuit 103 switches from the first battery module to the first power supply, the voltage changes smoothly, avoiding instability of the heating circuit or other components caused by voltage mutations.

[0054] Similarly, two capacitors (i.e., the third capacitor 1015 and the fourth capacitor 1016) can be selected in parallel and connected between the first battery module and the source of the second transistor 1012, and one end of the parallel connection is also grounded, so as to effectively filter out the fluctuations of the battery output voltage and ensure the smooth progress of the preheating process.

[0055] Here, the filtering principle of the capacitor is based on its impedance characteristic to the AC signal (high-frequency noise). The impedance of the capacitor to the AC signal is inversely proportional to its frequency, which means that the capacitor has a lower impedance to the high-frequency signal and a higher impedance to the DC signal (or extremely low-frequency signal). Thus, the high-frequency noise will flow to the ground wire through the low-impedance path formed by the capacitor and be filtered out. By paralleling two capacitors, the reliability of the overall filtering network can be improved.

[0056] For example, as Figure 5 shown, C1 (an example of the first capacitor) and C2 (an example of the second capacitor) are in parallel, with one end connected between P12V and the source of Q1, and the other end grounded. C3 (an example of the third capacitor) and C4 (an example of the fourth capacitor) are in parallel, with one end connected between P12V_BAT and the source of Q2, and the other end grounded.

[0057] Through this embodiment, filtering the output voltage of the power supply by paralleling capacitors can improve the stability and reliability of the device heating circuit.

[0058] In an exemplary embodiment, a voltage comparator can be used to implement the heating control circuit. When the resistance value of the first thermistor reaches the set critical value, the output level of the voltage comparator will switch, thereby realizing the switching of the heating circuit in a hardware manner. Here, the set critical value can be the first resistance value, and this value can be achieved by configuring the resistance value of the associated resistor.

[0059] In this embodiment, as Figure 6As shown, the heating control circuit 102 further includes: a first resistor 1021, a second resistor 1022, a third resistor 1023, a voltage comparator 1024, and a third transistor 1025. Among them, one end of the first resistor 1021 is connected to the second battery module, and the other end is connected to the second resistor 1022; one end of the second resistor 1022 is connected to the first resistor 1021, and the other end is grounded; one end of the third resistor 1023 is connected to the third battery module, and the other end is connected to the first thermistor; one end of the first thermistor is connected to the third resistor 1023, and the other end is grounded; the inverting input terminal of the voltage comparator 1024 is connected between the first resistor 1021 and the second resistor 1022, the non-inverting input terminal is connected between the third resistor 1023 and the first thermistor, and the output terminal is connected to the gate of the third transistor 1025; the source of the third transistor 1025 is connected to the output terminal of the power supply switching circuit 101, and the drain is connected to the heating circuit 103.

[0060] The level switching principle of the voltage comparator is as follows: when the temperature is lower than a certain temperature threshold, the resistance value of the first thermistor increases to be higher than the first resistance value, making the voltage at the non-inverting input terminal higher than that at the inverting input terminal. The voltage comparator outputs a low level, the third transistor conducts, activates the heating circuit, and heats the device where the heating circuit of the device is located; when the temperature is higher than a certain temperature threshold, the resistance value of the first thermistor decreases to be lower than the first resistance value, the voltage comparator outputs a high level, the third transistor cuts off, and the heating circuit is turned off, and the device where the heating circuit of the device is located is not heated.

[0061] Here, the third transistor 1025 can be a MOS transistor. For example, a PMOS transistor, whose gate can be connected to the output terminal of the voltage comparator 1024, and the drain is connected to the heating circuit 103. Thus, when the voltage comparator 1024 outputs a low level, the third transistor 1025 conducts, and the heating circuit 103 maintains power supply. When the voltage comparator 1024 outputs a high level, the third transistor 1025 cuts off, and the power supply of the heating circuit 103 is cut off.

[0062] Optionally, the second battery module that supplies power to the inverting input terminal of the voltage comparator 1024 and the third battery module that supplies power to the non-inverting input terminal of the voltage comparator 1024 can be the same battery module or different battery modules, and they can have the same power supply voltage, so as to avoid introducing voltage offset.

[0063] Optionally, a resistor can be set up to construct a voltage dividing circuit to provide a reference voltage for the voltage comparator 1024. For example, the first resistor 1021 and the second resistor 1022 can be set up to construct the voltage dividing circuit for the inverting input terminal to provide a stable reference voltage for the inverting input terminal of the voltage comparator 1024, while the third resistor 1023 and the first thermistor are used to construct the voltage dividing circuit for the non-inverting input terminal to provide a signal voltage that varies with temperature for the non-inverting input terminal of the voltage comparator 1024. By precisely configuring the resistance values of these resistors, it can be ensured that at a specific temperature, the output of the voltage comparator meets the design requirements.

[0064] Optionally, the resistance values of the first resistor 1021 and the third resistor 1023 can be the same, thus forming a symmetric voltage division ratio in the circuit. In this way, when the temperature changes, the voltage difference between the non-inverting input terminal and the inverting input terminal of the voltage comparator 1024 is directly related to the change in the resistance value of the first thermistor, rather than being affected by the resistance value differences of other resistors in the circuit. This design helps to improve the sensing accuracy of the voltage comparator to temperature changes.

[0065] For example, as Figure 7 shown, the low-temperature heating circuit includes: U1 (an example of a voltage comparator), RT1 (an example of the first thermistor), R1 (an example of the first resistor), R2 (an example of the second resistor), R3 (an example of the third resistor), Q3 (a MOS transistor, an example of the third transistor), and F2 (a heating sheet, an example of a heating circuit).

[0066] Among them, the working mode of U1 is: when the voltage of +IN (non-inverting input terminal) is greater than the voltage of -IN (inverting input terminal), the OUT pin outputs a low level; when the voltage of +IN is less than the voltage of -IN, the OUT pin outputs a high level. Take the resistance value of R1 as 10 kΩ and the resistance value of R2 as 28.2 kΩ. At this time, the voltage of -IN is 2.436 V. RT1 is a thermistor, and the NTC type is selected. The resistance value at room temperature of 25 °C is 10 kΩ. The calculation formula for the resistance value of the NTC thermistor is shown in formula (1):

[0067] R T =R N *expB(1 / T - 1 / T N ) (1)

[0068] Among them, R T represents the resistance value of the NTC thermistor at temperature T, R N represents the resistance value of the NTC thermistor at the rated temperature T N , B represents the material constant of the NTC thermistor, and exp represents the exponential with the natural number e as the base.

[0069] When the temperature is lower than 0°C, the resistance value of RT1 is greater than 28224 Ω, and the resistance value of R3 is 10 kΩ. At this time, the voltage of +IN is greater than 2.436 V, and the OUT pin outputs a low level. When the temperature is higher than 0°C, the resistance value of RT1 is less than 28224 Ω, and the resistance value of R3 is 10 kΩ. After voltage division, the voltage of +IN is less than 2.436 V at this time, and the OUT pin outputs a high level. P3V3_BAT is powered by a lithium battery. The reason for using a lithium battery for power supply is that when the machine is in a low-temperature startup scenario and the ambient temperature is too low (lower than -20°C), many chips cannot work properly and it is very easy to fail to start. Therefore, when starting at low temperature, P3V3_BAT is used for power supply. Before starting, it is judged that the machine is in a low-temperature scenario, and the machine is pre-heated to ensure normal startup of the machine.

[0070] Q3 is a PMOS transistor. The working mode is that the source (S) of the MOS transistor is connected to P12V and is at a high level. When the temperature is lower than 0°C, the OUT pin of U1 outputs a low level, OUT1 is at a low level, and the input IN2 (the gate input of Q3) is at a low level. At this time, the voltage difference between the source and the gate is greater than 0.7 V, and Q3 conducts, and P12V normally supplies power to the heating element. When the temperature is higher than 0°C and lower than 125°C, the OUT pin of U1 outputs a high level, OUT1 is at a high level, and the input IN2 is at a high level. The voltage difference V SG is less than 0.7 V, Q3 is cut off, P12V is disconnected from the subsequent circuit, and the heating element stops heating at this time.

[0071] Through this embodiment, using a thermistor combined with a voltage comparator to construct a heating control circuit can realize the on-off control of the heating circuit in a hardware manner, which can improve the stability and flexibility of the heating circuit of the device.

[0072] In an exemplary embodiment, a temperature change rate detection module can be added, including a high-precision temperature sensor and a microcontroller. The temperature sensor can continuously detect the ambient temperature and convert the detected ambient temperature into an electrical signal change and transmit it to the microcontroller.

[0073] Optionally, the microcontroller can include a temperature change rate calculation algorithm. Through continuously measured temperature data, the real-time temperature change rate per unit time can be calculated to quickly identify sudden temperature changes. Here, a temperature change rate threshold can be preset in advance, and the detected real-time temperature change rate can be compared with the temperature change rate threshold to judge whether there is an abnormal situation. For example, when the real-time temperature change rate is higher than the temperature change rate threshold and indicates a temperature drop, it can be judged that there is an abnormal temperature drop situation.

[0074] Optionally, a switching resistor activated by a control signal output by a microcontroller may be connected in parallel to the second resistor described above. The resistance value of the switching resistor may be lower than that of the second resistor. When the control signal is at a low level, the switching resistor is not activated. When the microcontroller detects an abnormal temperature drop, the control signal output by the microcontroller becomes high level, and the switching resistor is activated. This will cause the reference voltage at the inverting input terminal of the voltage comparator to decrease. Furthermore, the flip point of the voltage comparator decreases. When the temperature has not reached the above-mentioned preset low temperature threshold, the voltage comparator will also flip because the voltage at the non-inverting input terminal is higher than the decreased reference voltage at the inverting input terminal, and output a low level, causing the heating circuit to start in advance.

[0075] Optionally, when the temperature change rate returns to normal, the control signal output by the microcontroller returns to a low level, the switching resistor is disconnected, and the flip point of the voltage comparator returns to its original value.

[0076] In this embodiment, by adding a temperature change rate detection module and indirectly affecting the reference voltage of the voltage comparator according to the detected temperature change rate, the temperature change rate signal can be used as an additional input to participate in determining the power supply state of the heating circuit. When the temperature change rate suddenly increases, even if the temperature has not reached the expected low temperature threshold, the heating control circuit can respond in time and start heating. When the temperature change rate returns to normal, the heating control circuit can accurately turn off the heating, which can avoid the delay of heating control in an environment with rapid temperature changes, improve the response speed and accuracy of the heating control circuit to temperature changes, and enhance the adaptability and stability of the device in a harsh environment.

[0077] In an exemplary embodiment, as Figure 8 shown, the heating control circuit 102 further includes at least one of the following: a fifth capacitor 1026, where one end of the fifth capacitor 1026 is connected between the positive power supply terminal of the voltage comparator 1024 and the fourth battery module, and the other end is grounded, and the negative power supply terminal of the voltage comparator 1024 is grounded; a fourth resistor 1027, where the fourth resistor 1027 is connected between the output terminal of the voltage comparator 1024 and the gate of the third transistor 1025.

[0078] Similar to the foregoing embodiment, the fifth capacitor 1026 can be set. The fifth capacitor 1026 is connected between the positive power supply terminal of the voltage comparator 1024 and the fourth battery module, and the other end is grounded, so that high-frequency noise and voltage fluctuations on the power line can be filtered out to ensure the stable power supply of the voltage comparator.

[0079] Optionally, a resistor (i.e., the fourth resistor 1027) can be set between the output terminal of the voltage comparator 1024 and the gate of the third transistor 1025, for transmitting the signal output by the voltage comparator 1024 to the third transistor 1025, controlling the on - off state of the third transistor 1025. During the above process, the intensity of the signal can be adjusted to ensure sufficient drive for the third transistor 1025, but without exceeding its operating range, avoiding excessive current impact.

[0080] For example, as Figure 9 shown, C5 (an example of the fifth capacitor) is a filtering capacitor, with one end connected between the positive power supply terminal of U1 and P3V3_BAT, and the other end grounded. C5 can filter out high - frequency noise to ensure stable power supply for U1. In addition, R4 (an example of the fourth resistor) is connected to the output terminal of U1 for voltage regulation to ensure the safety of the circuit.

[0081] Through this embodiment, by setting a capacitor for filtering and a resistor for signal transmission, the stability and reliability of the heating control circuit can be improved.

[0082] In an exemplary embodiment, as Figure 10 shown, the heating control circuit 102 further includes: a sixth capacitor 1028 and a fifth resistor 1029, where the sixth capacitor 1028 and the fifth resistor 1029 are connected in parallel between the gate and the source of the third transistor 1025.

[0083] In this embodiment, the voltage fluctuation between the gate and the source can be reduced by setting the sixth capacitor 1028 between the gate and the source of the third transistor 1025, preventing it from being affected by noise and avoiding damage. A fifth resistor 1029 can also be set between the gate and the source of the third transistor 1025, so as to provide a current - limiting path to prevent the gate voltage from changing too fast during circuit switching, resulting in excessive gate current, which helps protect the transistor from being damaged by the instantaneous high current impact of the gate drive circuit.

[0084] For example, as Figure 11 shown, R5 (an example of the fifth resistor) and C6 (an example of the sixth capacitor) are connected in parallel between the source and the gate of Q3, which can ensure the voltage stability of Q3 and reduce the damage risk of the MOS transistor.

[0085] Through this embodiment, by adding a parallel resistor and capacitor between the source and the gate of the MOS transistor, it can be ensured that the MOS transistor can switch states smoothly and quickly when receiving the corresponding signal, improving the stability and reliability of the device heating circuit.

[0086] In an exemplary embodiment, to prevent the device from continuing to heat under abnormal high temperature conditions and causing overheating damage to the device, a power supply shutdown circuit may be provided in the device heating circuit. The device heating circuit further includes: a power supply shutdown circuit 104, which is provided between the voltage comparator 1024 and the third transistor 1025 and is used to cut off the power supply of the heating circuit 103 under abnormal high temperature.

[0087] As Figure 12 shown, the power supply shutdown circuit 104 includes a second thermistor 1041, a sixth resistor 1042, a seventh resistor 1043, a fourth transistor 1044, and an OR gate chip 1045; wherein, one end of the second thermistor 1041 is connected to the sixth resistor 1042, and the other end is grounded; one end of the sixth resistor 1042 is connected to the second thermistor 1041, and the other end is connected to the fifth battery module; the gate of the fourth transistor 1044 is connected between the second thermistor 1041 and the sixth resistor 1042, the drain is grounded, and the source is connected to the first input terminal of the OR gate chip 1045; one end of the seventh resistor 1043 is connected to the sixth battery module, and the other end is connected between the source of the fourth transistor 1044 and the input terminal of the OR gate chip 1045; the first input terminal of the OR gate chip 1045 is connected to the source of the fourth transistor 1044, the second input terminal is connected to the reference voltage, and the output terminal is connected to the power supply switching circuit 102.

[0088] The power supply shutdown circuit 104 is configured to cut off the fourth transistor 1044 based on the resistance value of the second thermistor 1041 being lower than the second resistance value. When the fourth transistor 1044 is cut off, the input of the first input terminal is at a high level, the output of the OR gate chip 1045 is at a high level, and the third transistor 1025 is cut off to disconnect the power supply of the power supply switching circuit 101 to the heating circuit 103. The temperature at which the third transistor 1025 is cut off based on the resistance value of the second thermistor 1041 is higher than the temperature at which the third transistor 1025 is cut off based on the resistance value of the first thermistor.

[0089] Optionally, a PTC thermistor may be selected as the second thermistor 1041, and its resistance value increases with the increase of temperature. This rate of resistance change is determined by the physical properties of the thermistor material. An NMOS transistor may be selected as the fourth transistor 1044, which conducts when the gate voltage is higher than the source voltage and cuts off when the gate voltage is close to or lower than the source voltage.

[0090] Optionally, a sixth resistor 1042 can be provided between the second thermistor 1041 and the fifth battery module to form a voltage division circuit for proportionally distributing the power supply voltage provided by the fifth battery module between the gate and source of the fourth transistor 1044, and adjusting the gate voltage according to the temperature change, thereby controlling the on or off state of the transistor. At normal operating temperatures, the voltage division of the second thermistor 1041 and the sixth resistor 1042 causes the gate voltage of the fourth transistor 1044 to be higher than its threshold voltage, and the fourth transistor 1044 conducts; when the temperature rises abnormally, the resistance value of the second thermistor 1041 increases, the voltage division ratio of the second thermistor 1041 and the sixth resistor 1042 changes, resulting in the gate voltage of the fourth transistor 1044 dropping below the threshold voltage, the fourth transistor 1044 turns off, the input of the first input terminal of the OR gate chip 1045 is at a high level, and the output of the OR gate is at a high level. At this time, the third transistor 1025 turns off, thereby disconnecting the power supply to the heating circuit 103.

[0091] For example, in a high-temperature shutdown circuit (an example of a power supply shutdown circuit) as shown in Figure 13 , Q4 (an example of the fourth transistor) is an NMOS transistor, a thermistor RT2 (an example of the second thermistor), of the PTC type, is connected between the gate (G) and source (S) of Q4, and the resistance value of R6 (an example of the sixth resistor) is 2 KΩ. Among them, the input terminal IN1 of the OR gate (an example of the OR gate chip) corresponds to Figure 7 or Figure 9 OUT1 in

[0092] When the temperature is lower than 0 °C, OUT1 is at a low level, the input IN1 is at a low level, and the other input terminal of the OR gate is also at a low level, OUT2 is at a low level. Correspondingly, IN2 (the input terminal of the Q3 gate) is at a low level. At this time, the voltage difference between the source and gate of Q3 is greater than 0.7 V, and Q3 conducts, and P12V normally supplies power to the heating element. When the temperature is higher than 0 °C and lower than 125 °C, OUT1 is at a high level, the other input terminal of the OR gate is at a low level, OUT2 is at a high level, and IN2 is at a high level. At this time, the voltage difference between the source and gate of Q3 is less than 0.7 V, Q3 turns off, P12V is disconnected from the subsequent circuit, and the heating element stops heating at this time.

[0093] When the temperature is higher than 125°C, the machine is abnormally hot at this time. The resistance value of RT2 is 538Ω. After voltage division, the voltage difference between the gate and the source of Q4 is less than 0.7V at this time, and Q4 is turned off. The drain (D) of Q4 is connected to VCC (P3V3_BAT) through R7 (an example of the seventh resistor) to be at a high level. The input terminal of the OR gate corresponding to Q4 is at a high level, and IN1 is also at a high level. After passing through the OR gate, OUT2 is still at a high level. Correspondingly, IN2 is also at a high level. At this time, the voltage difference between the source and the gate of Q3 is less than 0.7V, and Q3 is turned off, and the heating power supply can be disconnected to stop heating.

[0094] Through this embodiment, the power supply of the heating circuit can be turned off under abnormally high temperatures through the power supply cut-off circuit, which can improve the safety of the device heating circuit and avoid device damage caused by abnormally high temperature conditions.

[0095] In an exemplary embodiment, as Figure 14 shown, the device heating circuit further includes: a communication module 105. Among them, the communication module 105 is connected between the source and the first input terminal of the fourth transistor 1044. The communication module 105 is used to send an abnormal alarm signal to a specified device when the fourth transistor 1044 is turned off.

[0096] In this embodiment, the communication module 105 can be added to the device heating circuit, so that when the device is abnormally hot, an abnormal alarm signal can be automatically sent to the data center or a specified monitoring device. Then, relevant personnel can take measures quickly to avoid more serious device damage or service interruption.

[0097] Here, the communication module 105 can be connected between the source and the first input terminal of the fourth transistor 1044. When the fourth transistor 1044 is turned off, the high-level signal received by the first input terminal can also be sent to the communication module 105, thereby triggering the generation of the alarm signal by the communication module 105.

[0098] Optionally, a ZIGBEE module can be selected as the above communication module. Here, the ZIGBEE module is a communication module that supports the ZIGBEE protocol. The ZIGBEE protocol is a wireless communication protocol based on the IEEE 802.15.4 standard, which is suitable for short-distance and low-power network communication. In the scenario of edge server networking, the ZIGBEE module can be used as a node to transmit the alarm signal to the hub or gateway in the network through the ZIGBEE network, and then upload the information to the data center or remote monitoring device. This network architecture can not only achieve fast and reliable transmission of alarm information, but also improve the stability and coverage of communication through the self-organization and self-repair characteristics of the ZIGBEE network.

[0099] For example, asFigure 15 As shown, the output signal between the source of Q1 and R3 is connected to the GPIO (General Purpose Input / Output) pin of the ZIGBEE module (an example of a communication module) inside the machine. This signal serves as an alarm signal for abnormal machine heating. All edge servers within a certain area can be networked to report the alarm signal to the data center for timely troubleshooting.

[0100] The above device heating circuit can be applied to edge servers for low-temperature scenarios. It has an automatic shutdown function, which can ensure the stable operation of edge servers. The core components of the device heating circuit include: a voltage comparator chip, an OR gate chip, two thermistors, a ZIGBEE module, and a solar lithium battery module, which can ensure that internal components can work normally at low temperatures. This is crucial for servers deployed in extreme climate conditions, which can improve the reliability and durability of the servers and reduce service interruptions caused by environmental factors. The device heating circuit can ensure the normal switching of the heating element at the hardware level. When there is a fault in the MCU program and the heating element gets out of control, it can automatically disconnect the heating and report it to the data center through the ZIGBEE module, which is applicable to application scenarios where multiple edge servers are deployed simultaneously. The heating circuit starts heating when the chassis temperature is below 0°C (or other temperature thresholds) and stops heating when the temperature is above 0°C. It can also stop heating when detecting abnormal operation of the heating element to avoid board burning.

[0101] Here, by utilizing the solar power supply of the machine and the ZIGBEE module, normal startup of the machine in an ultra-low temperature environment and alarm reporting for abnormal heating of the heating element can be achieved. Additionally, it does not occupy I2C (Inter-Integrated Circuit) communication resources and reduces the complexity of MCU programming, meaning that the core control unit of the edge server can handle other key tasks more efficiently, such as data processing, network communication, etc. This efficient utilization of resources helps to improve the overall performance and response speed of the server.

[0102] In this embodiment, an automatic temperature control mechanism is adopted, including the acquisition, comparison, and processing of temperature signals, as well as the on and off conditions of the heating circuit. These solutions ensure that the heating circuit can be precisely adjusted according to the actual working environment temperature of the edge server, improving the stability and reliability of the server, reducing costs, saving resources, enhancing environmental adaptability, and durability.

[0103] Through this embodiment, by adding a communication module, an alarm signal can be sent in case of abnormal high temperature, thereby enabling timely troubleshooting of the device heating circuit and improving the safety of the device heating circuit.

[0104] In an exemplary embodiment, as Figure 16 shown, the power supply shutdown circuit 104 further includes: a seventh capacitor 1046, which is connected in parallel between the gate and the drain of the fourth transistor 1044. When a sudden temperature change causes the gate voltage of the fourth transistor 1044 to change rapidly, the seventh capacitor 1046 can absorb or release charges, thereby smoothing the change in the gate voltage and preventing the fourth transistor 1044 from malfunctioning due to instantaneous fluctuations in the gate voltage. In addition, the seventh capacitor 1046 can also be used to filter out high-frequency noise on the gate of the fourth transistor 1044 and protect the stable operation of the fourth transistor 1044.

[0105] Through this embodiment, by adding a filter capacitor between the gate and the drain of the transistor, the stability and reliability of the heating control circuit can be improved.

[0106] It should be noted that the above-mentioned modules can be implemented by software or hardware. For the latter, it can be implemented in the following ways, but not limited thereto: the above-mentioned modules are all located in the same processor; or, the above-mentioned modules are separately located in different processors in any combination form.

[0107] According to another aspect of the embodiments of the present application, a server is further provided. The server can be an edge server, and the server can include the device heating circuit in any one of the foregoing embodiments. The number of servers can be one or multiple. There can be one device heating circuit or multiple device heating circuits in one server. The device heating circuits corresponding to different servers can be different. In addition to the device heating circuit, the server can also include components for implementing other functions, which are not limited in this embodiment.

[0108] The above are only optional embodiments of the present application and are not used to limit the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the principle of the present application shall be included in the protection scope of the present application.

Claims

1. A device heating circuit, characterized in that: include: A power switching circuit, a heating control circuit and a heating circuit, wherein: The first power input terminal of the power switching circuit is connected to the first power supply, and the second power input terminal is connected to the first battery module. The power switching circuit is used to switch to the power supply for powering the heating circuit based on the device startup signal of the device where the device heating circuit is located, wherein when the device startup signal is at a high level, the temperature at which the first battery module is used to power the heating circuit, and when the device startup signal is at a low level, the first power supply is used to power the heating circuit; The heating control circuit comprises a first thermistor, and the heating control circuit is used to control a heating state of the heating circuit based on the first thermistor; The heating circuit is used to heat the device where the device heating circuit is located based on the control of the heating control circuit.

2. The device heating circuit according to claim 1, characterized in that: The power switching circuit comprises: a first transistor and a second transistor, wherein the gate of the first transistor and the gate of the second transistor are both connected to a power control terminal, the power control terminal is the input terminal of the device start signal, the drain of the first transistor and the drain of the second transistor are both connected to a power output terminal of the power switching circuit, the power output terminal of the power switching circuit is the output terminal of the power supply of the heating circuit which is controlled by the power switching circuit, the source of the first transistor is the first power input terminal, and the source of the second transistor is the second power input terminal.

3. The device heating circuit according to claim 2, characterized in that: The power switching circuit includes: a first capacitor, a second capacitor, a third capacitor and a fourth capacitor; wherein, The first capacitor and the second capacitor are connected in parallel, and one end of the parallel connection is grounded, and the other end of the parallel connection is connected between the first power supply and the source of the first transistor; The third capacitor and the fourth capacitor are connected in parallel, and one end of the parallel connection is grounded, and the other end of the parallel connection is connected between the first battery module and the source of the second transistor.

4. The device heating circuit according to claim 1, characterized in that: The heating control circuit further includes: a first resistor, a second resistor, a third resistor, a voltage comparator and a third transistor; wherein, One end of the first resistor is connected to the second battery module, and the other end is connected to the second resistor; One end of the second resistor is connected to the first resistor, and the other end is grounded; One end of the third resistor is connected to the third battery module, and the other end is connected to the first thermistor; One end of the first thermistor is connected to the third resistor, and the other end is grounded; The inverting input terminal of the voltage comparator is connected between the first resistor and the second resistor, the non-inverting input terminal is connected between the third resistor and the first thermistor, and the output terminal is connected to the gate of the third transistor; The source of the third transistor is connected to the output end of the power switching circuit, and the drain is connected to the heating circuit; Wherein, when the resistance value of the first thermistor is higher than the first resistance value, the output level of the voltage comparator is a low level to turn on the third transistor, and when the resistance value of the first thermistor is lower than the first resistance value, the output level of the voltage comparator is a high level to turn off the third transistor; Among them, the second battery module and the third battery module are the same battery module or different battery modules, and the output voltage of the second battery module is the same as the output voltage of the third battery module; the resistance value of the first resistor is the same as the resistance value of the third resistor, and the first resistance value is the resistance value of the second resistor.

5. The device heating circuit according to claim 4, characterized in that: The heating control circuit also includes at least one of the following: a fifth capacitor, wherein one end of the fifth capacitor is connected between the positive power supply terminal of the voltage comparator and the fourth battery module, and the other end is grounded, and the negative power supply terminal of the voltage comparator is grounded; a fourth resistor, wherein the fourth resistor is connected between the output terminal of the voltage comparator and the gate of the third transistor.

6. The device heating circuit according to claim 4, characterized in that: The heating control circuit also includes: a sixth capacitor and a fifth resistor, wherein the sixth capacitor and the fifth resistor are connected in parallel between the gate of the third transistor and the source of the third transistor.

7. The device heating circuit according to claim 4, characterized in that: The device heating circuit also includes: a power supply shutoff circuit, the power supply shutoff circuit includes a second thermistor, a sixth resistor, a seventh resistor, a fourth transistor and an OR gate chip; wherein, One end of the second thermistor is connected to the sixth resistor, and the other end is grounded; One end of the sixth resistor is connected to the second thermistor, and the other end is connected to the fifth battery module; The gate of the fourth transistor is connected between the second thermistor and the sixth resistor, the drain is grounded, and the source is connected to the first input terminal of the OR gate chip; One end of the seventh resistor is connected to the sixth battery module, and the other end is connected between the source of the fourth transistor and the input end of the OR gate chip; The first input terminal of the OR gate chip is connected to the source of the fourth transistor, the second input terminal is connected to the output terminal of the voltage comparator, and the output terminal is connected to the gate of the third transistor; The power supply shutdown circuit is used to cut off the fourth transistor based on the resistance value of the second thermistor being lower than the second resistance value. When the fourth transistor is cut off, the input of the first input terminal is at a high level, the output of the OR gate chip is at a high level, and the third transistor is cut off to disconnect the power supply of the heating circuit by the power switching circuit. The temperature at which the third transistor is cut off based on the resistance value of the second thermistor is higher than the temperature at which the third transistor is cut off based on the resistance value of the first thermistor.

8. The device heating circuit according to claim 7, characterized in that: The device heating circuit also includes: a communication module; wherein, The communication module is connected between the source of the fourth transistor and the first input terminal, and is used for sending an abnormal alarm signal to a designated device when the fourth transistor is cut off.

9. The device heating circuit according to claim 7, characterized in that: The power supply shutdown circuit further includes: a seventh capacitor, wherein the seventh capacitor is connected in parallel between the gate of the fourth transistor and the drain of the fourth transistor.

10. A server, characterized in that: The server comprises the device heating circuit according to any one of claims 1 to 9.

Images