Temperature control circuit, heating system and vehicle

Abstract

The utility model discloses a temperature control circuit, a heating system and a vehicle, relates to the technical field of PTC (Positive Temperature Coefficient) heating control of new energy automobiles, and aims to solve the problem of higher power consumption of a conventional temperature detection sub-circuit. The temperature control circuit comprises a plurality of temperature detection sub-circuits and a controller. The first ends of the plurality of temperature detection sub-circuits are electrically connected with the power supply end, the second ends of the plurality of temperature detection sub-circuits are electrically connected with the grounding end, and the third ends of the plurality of temperature detection sub-circuits are electrically connected with the controller. The controller comprises a temperature acquisition port, and the temperature acquisition port is electrically connected with the first ends of at least two temperature detection sub-circuits in the plurality of temperature detection sub-circuits. The controller is used for controlling the conduction of a target temperature detection sub-circuit in the at least two temperature detection sub-circuits, and obtaining a temperature detection signal detected by the target temperature detection sub-circuit through a temperature collection port electrically connected with the target temperature detection sub-circuit.

Description

Technical Field

[0001] The utility model relates to the technical field of PTC heating control of new energy vehicles, and in particular to a temperature control circuit, a heating system and a vehicle. Background Art

[0002] Temperature sensors are set at different locations in the vehicle to detect the position temperature at different locations and feed the position temperature back to the controller. The controller sends a control signal to the temperature control system based on the position temperature value detected by the temperature sensor and the set target temperature value to control the temperature control system to achieve temperature control.

[0003] In the related art, each temperature sensor is connected to a connection port of a controller. After the controller is powered on, multiple temperature sensors will have power loss, resulting in higher power consumption of the temperature detection circuit. Utility Model Content

[0004] The purpose of the utility model is to provide a temperature control circuit, a heating system and a vehicle, aiming to solve the problem of high power consumption of the existing temperature detection sub-circuit.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] On the one hand, the present invention provides a temperature control circuit. The temperature control circuit includes: multiple temperature detection subcircuits, and a controller. The first ends of the multiple temperature detection subcircuits are electrically connected to the power supply end, the second ends of the multiple temperature detection subcircuits are electrically connected to the ground end, and the third ends of the multiple temperature detection subcircuits are respectively electrically connected to the controller. The controller includes a temperature acquisition port, which is electrically connected to the first ends of at least two temperature detection subcircuits among the multiple temperature detection subcircuits. The controller is used to control the conduction of a target temperature detection subcircuit among the at least two temperature detection subcircuits, and obtain a temperature detection signal detected by the target temperature detection subcircuit via the temperature acquisition port electrically connected to the target temperature detection subcircuit.

[0007] In the temperature control circuit provided by the embodiments of the present application, when the temperature control circuit is in operation, a controller controls one of the temperature detection subcircuits electrically connected to the same temperature acquisition port of the controller to be turned on. The turned-on temperature detection subcircuit transmits the collected temperature detection signal to the controller via the temperature acquisition port. During this process, only one of the multiple temperature detection subcircuits is turned on, thereby reducing the power consumption of the temperature control circuit.

[0008] In some embodiments, the temperature detection subcircuit includes a temperature sensor and a switching transistor. A first terminal of the temperature sensor is electrically connected to a first terminal of the temperature detection subcircuit. A control terminal of the switching transistor is electrically connected to a controller, a first terminal of the switching transistor is electrically connected to a second terminal of the temperature sensor, and a second terminal of the switching transistor is electrically connected to a second terminal of the temperature detection subcircuit.

[0009] In some embodiments, the temperature control circuit further includes a first resistor, a first end of the first resistor is electrically connected to the power supply end, and a second end of the first resistor is electrically connected to the first ends of at least two temperature detection subcircuits and the temperature acquisition port.

[0010] In some embodiments, the temperature control circuit further includes a second resistor and a first capacitor. A first end of the second resistor is electrically connected to the first ends of the at least two temperature detection sub-circuits and a second end of the first resistor, and a second end of the second resistor is electrically connected to the temperature acquisition port. A first end of the first capacitor is electrically connected to the second end of the second resistor, and a second end of the first capacitor is electrically connected to the second ends of the at least two temperature detection sub-circuits.

[0011] In some embodiments, the temperature control circuit also includes a power supply circuit, a first end of the power supply circuit is electrically connected to the power supply end, a second end of the power supply circuit is electrically connected to the ground end, a third end of the power supply circuit is electrically connected to the first end of the first resistor, and a fourth end of the power supply circuit is electrically connected to the second ends of multiple temperature detection sub-circuits.

[0012] In some embodiments, the temperature control circuit also includes a common mode circuit, wherein the first end of the common mode circuit is electrically connected to the third end of the power supply circuit, the second end of the common mode circuit is electrically connected to the fourth end of the power supply circuit, the third end of the common mode circuit is electrically connected to the first end of the first resistor, and the fourth end of the common mode circuit is electrically connected to the second ends of the multiple temperature detection sub-circuits.

[0013] In some embodiments, the controller includes a first power port and a second power port, the first power port is electrically connected to the third end of the common mode circuit and the first end of the first resistor, and the second power port is electrically connected to the fourth end of the common mode circuit and the second ends of the multiple temperature detection sub-circuits.

[0014] In some embodiments, the number of the temperature acquisition port is one, and the first ends of the plurality of temperature detection sub-circuits are all electrically connected to the temperature acquisition port.

[0015] In another aspect, the present invention further provides a heating system. The heating system comprises: at least one heating structure; and a temperature control circuit as provided in any of the above embodiments. The heating structure is configured to heat a target object or target environment, and each temperature detection subcircuit in the temperature control circuit is configured to detect the temperature of a heating structure.

[0016] The above heating system has the same structure and beneficial technical effects as the temperature control circuit provided in some of the above embodiments, which will not be repeated here.

[0017] In another aspect, the present invention further provides a vehicle, comprising a vehicle body and a heating system according to the above embodiment.

[0018] The above-mentioned vehicle has the same structure and beneficial technical effects as the temperature control circuit provided in some of the above-mentioned embodiments, which will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0020] Figure 1 is a structural diagram of a temperature control circuit according to some embodiments;

[0021] Figure 2 is a structural diagram of a temperature control circuit according to some other embodiments;

[0022] Figure 3 is a structural diagram of a temperature control circuit according to some other embodiments;

[0023] Figure 4 is a circuit structure diagram of a temperature control circuit according to some embodiments;

[0024] Figure 5 is a circuit structure diagram of a temperature control circuit according to some other embodiments;

[0025] Figure 6 is a circuit structure diagram of a temperature control circuit according to some other embodiments.

[0026] Reference numerals:

[0027] 10 / 20, temperature control circuit;

[0028] 1(11, 12, ..., 1n), temperature detection subcircuit;

[0029] 1a, first end; 1b, second end; 1c, third end;

[0030] RT (RT1, RT2, RT3, RT4, ..., RTn), temperature sensor;

[0031] Q (Q1, Q2, Q3, Q4, ..., Qn), switching transistors;

[0032] R1, first resistor;

[0033] R2, second resistor;

[0034] C1, first capacitor;

[0035] R01, R02, ..., R0n, voltage divider resistors;

[0036] 2. Controller;

[0037] 2a (21a, 22a, ..., 2na; 2aa, 2ab), temperature collection port;

[0038] 2b, control signal terminal;

[0039] 3. Power supply circuit;

[0040] 4. Common mode circuit. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0042] In the description of the present invention, it should be understood that the terms "upper," "lower," "left," "right," "front," "back," "inner," "outer," and the like, indicating directions or positional relationships, are based on the directions or relative positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific direction, be constructed, or operate in a specific direction. Therefore, they should not be construed as limitations on the present invention. Unless otherwise specified, the above-mentioned directions may be flexibly set in actual application, provided that the relative positional relationships shown in the accompanying drawings are met.

[0043] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, unless otherwise specified, "plurality" means two or more.

[0044] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "communicated" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integral connections. They may be directly connected, indirectly connected through an intermediary, or internally connected between two components. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0045] In the embodiments of the present invention, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, article, or device comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, article, or device comprising the element.

[0046] In the embodiments of the present invention, words such as "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present invention should not be construed as being preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner.

[0047] In the description of this specification, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0048] The utility model provides a vehicle, which includes a vehicle body and a heating system.

[0049] Exemplarily, the heating system is used to heat a target object or a target environment.

[0050] The heating system may be provided inside the vehicle. For example, when the temperature inside the vehicle (e.g., the cockpit) is below a set temperature, the heating system may heat the interior of the vehicle to maintain the temperature within the set temperature range, thereby improving the comfort of the driver and passengers.

[0051] In some embodiments, the heating system includes a temperature control circuit 10 and at least one heating structure. The temperature control circuit 10 includes at least one temperature detection subcircuit 1 .

[0052] Illustratively, the heating structure is used to heat a target object or a target environment.

[0053] For example, the multiple temperature detection sub-circuits 1 in the temperature control circuit 10 can be used to detect the temperature of the heating structure. Each of the multiple temperature detection sub-circuits 1 used to detect the temperature of a heating structure is used to detect the temperature of a heating structure. Alternatively, the multiple temperature detection sub-circuits 1 can each detect the temperature at different locations on a heating structure.

[0054] The multiple temperature detection sub-circuits 1 in the temperature control circuit 10 can also be used to detect the temperature of a target object or a target environment. Each of the multiple temperature detection sub-circuits 1 used to detect the temperature of a target object or a target environment is used to detect the temperature of a single target object or target environment. Alternatively, the multiple temperature detection sub-circuits 1 can each detect the temperature of a single target object or target environment at different locations.

[0055] Some embodiments of the present invention are described below by taking an example of a temperature detection subcircuit 1 used to detect the temperature of a heating structure.

[0056] For example, controller 2 may use PID (Proportional-Integral-Derivative) control to control the operation of the heating mechanism. Specifically, based on a control deviation between the desired cabin ambient temperature (B°C) and the actual cabin ambient temperature (C°C), controller 2 uses the proportional, integral, and differential linear combination of this deviation to form a control variable, thereby controlling the heating mechanism. The specific control process will be discussed later and will not be elaborated on here.

[0057] Exemplarily, the heating structure includes a PTC (Positive Temperature Coefficient) heater. The PTC heater can include a PTC ceramic heating element. PTC heating offers the advantages of low thermal resistance and high heat transfer efficiency, and avoids the "reddening" phenomenon associated with electric heating tube heaters, which can cause safety hazards such as burns or fire.

[0058] When the temperature of the PTC heater is lower than its Curie temperature, the resistance value of the PTC heater gradually increases as the temperature rises. Within this temperature range, the PTC heater can generate heat through the current, and as the temperature rises, the increase in resistance limits the passage of current, thereby controlling the heating rate and temperature to a certain extent.

[0059] When the temperature of the PTC heater is above its Curie temperature, the resistance value of the PTC heater will increase sharply as the temperature rises. Based on this characteristic of the PTC heater, the PTC heater has a self-limiting characteristic at high temperatures, which helps to prevent overheating problems.

[0060] For example, the heating structure can be arranged in a vehicle seat to heat the vehicle seat; it can also be applied to a vehicle air conditioner to heat the vehicle cockpit or to heat and defrost the windows.

[0061] The temperature control circuit 10 detects the temperature of the heating structure through the temperature detection subcircuit 1 and compares the detected temperature of the heating structure with the set temperature, thereby controlling the operation of the heating structure to achieve temperature regulation.

[0062] Take the case where the heating structure is a PTC heater and the heating system is an air conditioner applied to a vehicle as an example.

[0063] When the ambient temperature in the vehicle cockpit is A°C, the expected ambient temperature in the cockpit is B°C, and A is less than B, the heating system powers on the heating structure to transfer heat to the vehicle cockpit through the heating structure to increase the temperature in the vehicle cockpit.

[0064] According to the characteristics of the PTC heater, after the PTC heater is powered on, as the temperature of the PTC heater changes, the resistance of the PTC heater changes. In the process of the ambient temperature gradually rising to close to the expected ambient temperature, the temperature of the PTC heater remains within a certain range, and the resistance of the PTC heater also gradually stabilizes and remains within a certain range. When the expected ambient temperature remains unchanged, the resistance of the PTC heater can also be regarded as a constant value.

[0065] The power of PTC heater P=U2 / R——①

[0066] Wherein, U is the operating voltage of the PTC heater, and R is the resistance value of the PTC heater.

[0067] The heat generated by the PTC heater increases as the working time of the PTC heater increases.

[0068] The heat generated by the PTC heater is W = PT——②

[0069] Wherein, T is the operating time of the PTC heater.

[0070] PTC heater working time T = (1 / f) × d——③

[0071] Wherein, d is the proportion of the power-on time of the PTC heater to the total time in one pulse cycle (duty cycle).

[0072] From formulas ①②③, we can get: W=(U2 / R)×(1 / f)×d——④

[0073] According to formula ④, when the ambient temperature in the vehicle cockpit is A°C and approaches the expected ambient temperature in the cockpit of B°C, U, R, and f are all constants, and d is a variable. The heat output W of the PTC heater can be adjusted by changing the size of d, so that the ambient temperature in the vehicle cockpit can be maintained at the expected ambient temperature (maintaining at the expected ambient temperature here means that the difference between the actual ambient temperature and the expected ambient temperature is less than or equal to 5% of the ratio of the difference to the expected ambient temperature).

[0074] The PTC heater heats the target object or target environment by generating heat by itself. The longer the PTC heater works, the higher the temperature of the target object or target environment. When the PTC heater is used in a vehicle air conditioner, in order to meet the comfort of the driver and passengers, the temperature detection subcircuit 1 collects the temperature of the PTC heater in real time and adjusts the duty cycle of the PTC heater according to the current ambient temperature and the expected ambient temperature to adjust the heating value of the PTC heater.

[0075] In some embodiments, as Figure 1 As shown, the temperature control circuit 20 includes: multiple temperature detection sub-circuits 1 and a controller 2. The first terminals 1a of the multiple temperature detection sub-circuits 1 are electrically connected to the power supply terminal Vcc, and the second terminals 1b of the multiple temperature detection sub-circuits 1 are electrically connected to the ground terminal GND. The third terminal 1c of each temperature detection sub-circuit 1 is electrically connected to a temperature acquisition port 2a of the controller 2.

[0076] For example, Figure 1 As shown, the temperature control circuit 20 includes a plurality of temperature detection sub-circuits 1 , and the controller 2 has a plurality of temperature acquisition ports 2 a correspondingly arranged to the plurality of temperature detection sub-circuits 1 .

[0077] The multiple temperature detection subcircuits 1 are sequentially numbered as temperature detection subcircuit 11, temperature detection subcircuit 12, ..., temperature detection subcircuit 1n, where n is a positive integer greater than or equal to 2. The multiple temperature acquisition ports 2a of the controller 2 are sequentially numbered as temperature acquisition port 21a, temperature acquisition port 22a, ..., temperature acquisition port 2na.

[0078] The third end 1c of the temperature acquisition subcircuit 11 is electrically connected to the temperature acquisition port 21a of the controller 2, the third end 1c of the temperature acquisition subcircuit 12 is electrically connected to the temperature acquisition port 22a of the controller 2, ..., the third end 1c of the temperature acquisition subcircuit 1n is electrically connected to the temperature acquisition port 2na of the controller 2.

[0079] Exemplarily, the controller 2 may be an MCU (Microcontroller Unit). The MCU includes multiple AD (Analog-to-Digital) ports. Of course, the signal acquisition port of the MCU may also include other types of ports besides AD ports, such as DA (Digital-to-Analog) ports.

[0080] like Figure 1 and Figure 2 As shown, the controller 2 includes at least one AD port as a temperature acquisition port 2a. That is, the number of the temperature acquisition ports 2a of the controller 2 can be one, two, or more.

[0081] Thus, in the temperature control circuit 20 , the number of the temperature acquisition ports 2 a of the controller 2 must be consistent with the number of the temperature detection sub-circuits 1 , and more AD ports of the MCU must be occupied.

[0082] In addition to the temperature detection signal collected by the temperature detection sub-circuit 1, the controller 2 may also need to collect other signals (such as PT temperature sensor, vehicle internal and external temperature sensors). Such a design will cause a shortage of AD port resources of the MCU.

[0083] Based on this, the present invention provides a temperature control circuit 10 .

[0084] In some embodiments, as Figure 2 and Figure 3 As shown, the third terminals 1c of the multiple temperature detection sub-circuits 1 in the temperature control circuit 10 are electrically connected to the controller 2. A temperature acquisition port 2a of the controller 2 is electrically connected to the first terminals 1a of at least two of the multiple temperature detection sub-circuits 1. The controller 2 is configured to control the conduction of the target temperature detection sub-circuit in the at least two temperature detection sub-circuits 1 and to obtain a temperature detection signal detected by the target temperature detection sub-circuit via the temperature acquisition port 2a electrically connected to the target temperature detection sub-circuit.

[0085] For example, Figure 2 and Figure 3 As shown, the third terminals 1c of the plurality of temperature detection subcircuits 1 are respectively electrically connected to the control signal terminals 2b of the controller 2. The control signal terminals 2b of the controller 2 are configured to send control signals to the temperature detection subcircuits 1 to control the on and off of the temperature detection subcircuits 1.

[0086] Based on this, in some examples, such as Figure 2As shown, the number of temperature acquisition ports 2a is multiple (two or more), the first end 1a of the temperature detection sub-circuit 11 and the first end 1a of the temperature detection sub-circuit 12 are both electrically connected to the same temperature acquisition port 2aa, and the first end 1a of the temperature detection sub-circuit 1n is electrically connected to another temperature acquisition port 2ab.

[0087] In other examples, such as Figure 3 As shown, the number of the temperature acquisition port 2 a is one, and the first terminals 1 a of the plurality of temperature detection sub-circuits 1 are all electrically connected to the same temperature acquisition port 2 a.

[0088] Compared to Figure 1 The temperature control circuit 20 shown in FIG. Figure 2 and Figure 3 In the temperature control circuit 10 shown, at least some of the temperature detection sub-circuits 1 are electrically connected to the same temperature acquisition port 2a of the controller 2. In this way, while the number of temperature detection sub-circuits 1 remains unchanged, the occupancy of the AD port of the controller 2 is reduced, allowing the controller 2 to access more different signals, thereby improving the functional integration of the controller 2.

[0089] Furthermore, in some embodiments of the related art, such as Figure 1 As shown, after the controller 2 is powered on, current will flow through the multiple temperature detection sub-circuits 1 in the temperature control circuit 20 . The multiple temperature detection sub-circuits 1 will have power loss, resulting in higher power consumption of the temperature control circuit 20 .

[0090] In this embodiment, Figure 2 and Figure 3 As shown, in the at least two temperature detection sub-circuits 1 electrically connected to the same temperature acquisition port 2 a of the controller 2 , each temperature detection sub-circuit 1 is turned on separately.

[0091] For example, Figure 2 As shown, both temperature detection subcircuit 11 and temperature detection subcircuit 12 are electrically connected to the same temperature acquisition port 2aa of controller 2. When temperature control circuit 10 is operating, controller 2 controls temperature detection subcircuit 11 or temperature detection subcircuit 12 to be conductive. The conductive temperature detection subcircuit 11 or temperature detection subcircuit 12 transmits the collected temperature detection signal to controller 2 via temperature acquisition port 2aa. During this process, when temperature detection subcircuit 11 is conductive, temperature detection subcircuit 12 is not conductive, resulting in no power loss, thereby reducing the power consumption of temperature control circuit 10.

[0092] For example, Figure 3As shown, multiple temperature detection subcircuits 1 (temperature detection subcircuits 11 to 1n) are electrically connected to the same temperature acquisition port 2a of controller 2. When temperature control circuit 10 is operating, controller 2 controls one of the multiple temperature detection subcircuits 1 to be turned on. The turned-on temperature detection subcircuit 1 transmits the collected temperature detection signal to controller 2 via temperature acquisition port 2a. During this process, only one temperature detection subcircuit 11 among the multiple temperature detection subcircuits 1 is turned on, thereby reducing the power consumption of temperature control circuit 10.

[0093] In some embodiments, as Figure 4 As shown, the temperature detection subcircuit 1 includes a temperature sensor RT and a switching transistor Q. A first terminal of the temperature sensor RT is electrically connected to a first terminal of the temperature detection subcircuit 1. A control terminal of the switching transistor Q is electrically connected to a controller 2, a first electrode of the switching transistor Q is electrically connected to a second terminal of the temperature sensor RT, and a second electrode of the switching transistor Q is electrically connected to a second terminal of the temperature detection subcircuit 1.

[0094] For example, Figure 4 As shown, the control terminal of the switch transistor Q is electrically connected to the control signal terminal 2b of the controller 2. The control signal terminal 2b of the controller 2 is configured to send a control signal to the switch transistor Q to turn the switch transistor Q on or off.

[0095] Exemplarily, each temperature detection sub-circuit 1 includes a temperature sensor RT and a switching transistor Q.

[0096] like Figure 4 As shown, the temperature sensor RT1 of the temperature detection subcircuit 11 is used, for example, to detect the temperature of a heating structure, and the temperature sensor RT2 of the temperature detection subcircuit 12 is used, for example, to detect the temperature of another heating structure; the temperature detection subcircuit 1n can be used to detect the temperature of another heating structure, or to detect the temperature of other target objects or target environments, for example, the temperature in a vehicle cockpit, etc.

[0097] In the process of the temperature control circuit 10 regulating the heating of the heating structure, the temperature sensor RT detects the temperature of the corresponding heating structure. When it is necessary to collect the temperature of the heating structure corresponding to the temperature sensor RT1, the controller 2 controls the switching transistor Q1 to be turned on, and the temperature sensor RT1 transmits the detected temperature detection signal of the corresponding heating structure to the controller 2 through the temperature collection port 2a. When multiple temperature sensors RT, for example Figure 4When the temperature sensors RT1 to RTn shown in the figure need to transmit temperature detection signal terminals to the controller 2, the controller 2 quickly switches the conduction state of the switching transistors Q1 to Qn, so that the temperature sensors RT1 to RTn respectively transmit corresponding temperature detection signals to the controller 2 through the same temperature acquisition port 2a.

[0098] Only one switching transistor Q is turned on at the same time. Thus, only one temperature sensor RT transmits a temperature detection signal to the controller 2 at the same time. Multiple temperature sensors RT do not interfere with each other. Moreover, only one temperature detection sub-circuit 1 is turned on at the same time to generate power consumption, while the other non-conducting temperature detection sub-circuits 1 do not generate power consumption. This can reduce the overall power consumption of the multiple temperature detection sub-circuits 1, thereby reducing the power consumption of the temperature control circuit 10.

[0099] In some embodiments, as Figure 4 As shown, the temperature control circuit 10 further includes a first resistor R1, a first end of the first resistor R1 is electrically connected to the power supply terminal Vcc, and a second end of the first resistor R1 is electrically connected to the first ends of at least two temperature detection sub-circuits 1 and the temperature acquisition port 2a.

[0100] like Figure 4 As shown, in the temperature control circuit 10, multiple temperature sensors RT share a voltage divider resistor (first resistor R1). When the temperature sensor RT detects the temperature of the corresponding heating structure, the resistance value of the temperature sensor RT changes with the temperature of the corresponding heating structure according to the temperature of the heating structure, and the resistance value of the first resistor R1 remains unchanged. At the same time, the voltage value applied across the first resistor R1 and the temperature sensor RT remains unchanged. In this way, the temperature of the detected heating structure can be obtained by collecting the voltage value across the temperature sensor RT and according to the corresponding relationship between the voltage value of the temperature sensor RT and the detected temperature.

[0101] In some embodiments of the related art, Figure 5 As shown, in the temperature control circuit 20, each temperature sensor RT is provided with a corresponding voltage dividing resistor R0n. Compared with the temperature control circuit 10 in the embodiment, Figure 5 The temperature control circuit 10 shown can simplify the circuit structure, reduce the number of voltage-dividing resistors R0n, and reduce the cost of the temperature control circuit 10.

[0102] In some embodiments, as Figure 4As shown, the temperature control circuit 10 further includes a second resistor R2 and a first capacitor C1. The first end of the second resistor R2 is electrically connected to the first ends of at least two temperature detection sub-circuits 1 and the second end of the first resistor R1, and the second end of the second resistor R2 is electrically connected to the temperature acquisition port 2a. The first end of the first capacitor C1 is electrically connected to the second end of the second resistor R2, and the second end of the first capacitor C1 is electrically connected to the second ends of at least two temperature detection sub-circuits 1.

[0103] R2 and C1 form an RC filter circuit, which filters the temperature detection signal output by the temperature sensor RT and then outputs it to the controller 2 to reduce noise interference and improve the reliability of the detection signal.

[0104] In some embodiments, as Figure 6 As shown, the temperature control circuit 10 also includes a power supply circuit 3, a first end of the power supply circuit 3 is electrically connected to the power supply end Vcc, a second end of the power supply circuit 3 is electrically connected to the ground end, a third end of the power supply circuit 3 is electrically connected to the first end of the first resistor R1, and a fourth end of the power supply circuit 3 is electrically connected to the second ends of the multiple temperature detection sub-circuits 1.

[0105] The power supply circuit 3 provides operating voltage to the multiple temperature detection sub-circuits 1. The voltage across the first resistor R1 and the temperature sensor RT is the voltage difference between the power supply terminal Vcc and the ground terminal GND. The voltage provided by the power supply terminal Vcc is, for example, 5V. The power supply terminal Vcc is connected to the low-voltage battery in the vehicle.

[0106] In some embodiments, as Figure 6 As shown, the temperature control circuit 10 also includes a common mode circuit 4, a first end of the common mode circuit 4 is electrically connected to the third end of the power supply circuit 3, a second end of the common mode circuit 4 is electrically connected to the fourth end of the power supply circuit 3, a third end of the common mode circuit 4 is electrically connected to the first end of the first resistor R1, and a fourth end of the common mode circuit 4 is electrically connected to the second ends of the multiple temperature detection sub-circuits 1.

[0107] For example, Figure 6 As shown, the controller 2 includes a first power port 21 and a second power port 22, the first power port 21 is electrically connected to the third end of the common mode circuit 4 and the first end of the first resistor R1, and the second power port 22 is electrically connected to the fourth end of the common mode circuit 4 and the second ends of multiple temperature detection sub-circuits 1.

[0108] In a vehicle, the controller 2 may be powered by the vehicle's low-voltage battery, and the wiring harness connecting the vehicle's power supply and the temperature control circuit 10 between the temperature detection subcircuit 1 and the temperature acquisition port 2a of the controller 2 may be bundled together. After the external RF high current injection signal, the signals transmitted by other wiring harnesses may interfere with the temperature detection signal transmitted by the wiring harness connecting the temperature detection subcircuit 1 and the temperature acquisition port 2a of the controller 2, causing deviations in the temperature detection signal transmitted to the controller 2.

[0109] In this embodiment, by connecting the controller 2 and the temperature detection sub-circuit 1 on the side of the common-mode circuit 4 away from the power supply circuit 3, the electromagnetic interference of the electrical signals transmitted by other connecting harnesses on the temperature detection signal will be filtered out by the common-mode circuit, thereby avoiding interference of other electrical signals on the temperature detection signal and improving the accuracy of temperature detection.

[0110] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A temperature control circuit, characterized in that: include: multiple temperature sensing subcircuits and controllers; The first ends of the plurality of temperature detection subcircuits are electrically connected to the power supply end, the second ends of the plurality of temperature detection subcircuits are electrically connected to the ground end, and the third ends of the plurality of temperature detection subcircuits are electrically connected to the controller respectively; The controller includes a temperature acquisition port, wherein the temperature acquisition port is electrically connected to first ends of at least two temperature detection subcircuits among the plurality of temperature detection subcircuits; The controller is used to control the target temperature detection subcircuit in the at least two temperature detection subcircuits to be turned on, and to obtain a temperature detection signal detected by the target temperature detection subcircuit via the temperature acquisition port electrically connected to the target temperature detection subcircuit.

2. The temperature control circuit according to claim 1, characterized in that: The temperature detection subcircuit comprises: a temperature sensor, wherein a first end of the temperature sensor is electrically connected to a first end of the temperature detection subcircuit; A switching transistor, wherein a control end of the switching transistor is electrically connected to the controller, a first electrode of the switching transistor is electrically connected to a second end of the temperature sensor, and a second electrode of the switching transistor is electrically connected to a second end of the temperature detection sub-circuit.

3. The temperature control circuit according to claim 1, wherein: The temperature control circuit further includes: A first resistor, wherein a first end of the first resistor is electrically connected to the power supply end, and a second end of the first resistor is electrically connected to the first ends of the at least two temperature detection sub-circuits and the temperature acquisition port.

4. The temperature control circuit according to claim 3, characterized in that: The temperature control circuit further includes: a second resistor, wherein a first end of the second resistor is electrically connected to the first ends of the at least two temperature detection sub-circuits and the second end of the first resistor, and a second end of the second resistor is electrically connected to the temperature acquisition port; A first capacitor, wherein a first end of the first capacitor is electrically connected to the second end of the second resistor, and a second end of the first capacitor is electrically connected to the second ends of the at least two temperature detection sub-circuits.

5. The temperature control circuit according to claim 3, characterized in that: The temperature control circuit further includes: A power supply circuit, wherein a first end of the power supply circuit is electrically connected to the power supply end, a second end of the power supply circuit is electrically connected to the ground end, a third end of the power supply circuit is electrically connected to the first end of the first resistor, and a fourth end of the power supply circuit is electrically connected to the second ends of the multiple temperature detection sub-circuits.

6. The temperature control circuit according to claim 5, characterized in that: The temperature control circuit further includes: a common-mode circuit, wherein a first end of the common-mode circuit is electrically connected to a third end of the power supply circuit, a second end of the common-mode circuit is electrically connected to a fourth end of the power supply circuit, a third end of the common-mode circuit is electrically connected to a first end of the first resistor, and a fourth end of the common-mode circuit is electrically connected to the second ends of the multiple temperature detection sub-circuits.

7. The temperature control circuit according to claim 6, characterized in that: The controller includes a first power port and a second power port, the first power port is electrically connected to the third end of the common mode circuit and the first end of the first resistor, and the second power port is electrically connected to the fourth end of the common mode circuit and the second ends of the multiple temperature detection sub-circuits.

8. The temperature control circuit according to any one of claims 1 to 7, characterized in that: The number of the temperature acquisition port is one, and the first ends of the multiple temperature detection sub-circuits are all electrically connected to the temperature acquisition port.

9. A heating system, characterized in that: include: The temperature control circuit according to any one of claims 1 to 8; at least one heating structure for heating a target object or a target environment; Wherein, each temperature detection subcircuit in the temperature control circuit is used to detect the temperature of one of the heating structures.

10. A vehicle, characterized in that: include: A vehicle body, and a heating system as claimed in claim 9.

Images