A heating controller integrated with NTC

Abstract

The utility model discloses a heating controller of integrated NTC, including shell, circuit board and wire, the controller circuit, power supply voltage stabilizing circuit, voltage measurement circuit, NTC circuit, switch signal input circuit, pilot lamp circuit and heating switch circuit are integrated on the circuit board, and the NTC element in NTC circuit is directly integrated on the circuit board, the on-board NTC temperature control device of development of the utility model uses built -in NTC, can reach and the same performance of current ordinary ECU, and improves the stability and accuracy of temperature control. Greatly reduced the material and time cost of subsequent product, still have processing working hours, reduced wire, connecting terminal simultaneously, improved the reliability of product, promoted customer use experience and reduced production cost. Can promote company technical strength, promote the price advantage of company product, and then promote the market competitiveness and economic benefit of company.

Description

Technical Field

[0001] This utility model belongs to the field of automotive parts heating control technology, specifically relating to a heating controller with integrated NTC. Background Technology

[0002] In applications such as heated car seats, heated steering wheels, and heated armrests, temperature control devices are core components that ensure heating effectiveness and safety. Currently, temperature control devices generally employ external NTC (negative temperature coefficient thermistor) methods for temperature sensing, meaning they detect temperature changes in the controlled object through an external NTC element.

[0003] However, this external NTC solution has several drawbacks: First, the external NTC needs to be connected to the control circuit via wires and terminals. The additional components not only increase material costs but also reduce the overall reliability of the product due to the increased number of connection points, making it prone to malfunctions such as poor contact. Second, the external NTC is usually small in size, resulting in a limited sensing area, making it difficult to accurately and comprehensively reflect the actual temperature of the controlled object, thus affecting the accuracy of temperature control. In addition, due to the small size of the external NTC, even a slight deviation in its installation position during production and assembly can have a significant impact on the temperature detection results, leading to obvious deviations in temperature control and affecting the user experience. Utility Model Content

[0004] The purpose of this invention is to provide a heating controller with integrated NTC to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a heating controller with integrated NTC, comprising a housing, a circuit board, and wires; The circuit board integrates a controller circuit, a power supply regulator circuit, a voltage measurement circuit, an NTC circuit, a switch signal input circuit, an indicator light circuit, and a heating switch circuit. The NTC component in the NTC circuit is directly integrated on the circuit board. The outer casing is used to enclose the circuit board and the solder joints between the wires and the circuit board. The wires are used to connect the power supply and transmit control signals. Temperature signals are acquired by an NTC element, processed by a controller circuit, and then the heating output is controlled by a heating switch circuit. At the same time, the heating status is displayed by an indicator light circuit.

[0006] Preferably, the housing is made of highly thermally conductive polyurethane to enhance the tensile strength of the wires, protect the circuit board, and facilitate the temperature sensing of the NTC components.

[0007] Preferably, the power supply regulation circuit includes a reverse connection protection diode D1, a Zener diode D2, a resistor R5, and a capacitor C4. The reverse connection protection diode D1 is used to protect the circuit when the power supply is reversed. The Zener diode D2, the resistor R5, and the capacitor C4 work together to adjust the input power supply voltage to 5V to supply power to the control circuit.

[0008] Preferably, the controller circuit receives signals transmitted from the voltage measurement circuit, the switch signal input circuit, and the NTC circuit to control the indicator light circuit and the heating switch circuit.

[0009] Preferably, the voltage measurement circuit is used to monitor changes in the power supply voltage. When the voltage is too high or too low, the controller circuit controls the heating switch circuit to turn off the heating based on the circuit signal to prevent circuit damage.

[0010] Preferably, the switch signal input circuit needs to be connected to an external control switch. When the switch is pressed, the circuit voltage is 0, and when the switch is open, the circuit voltage is 5V. The controller circuit switches the heating working state between off, high, medium, low and off by measuring this voltage signal.

[0011] Preferably, the indicator light circuit has three levels: high, medium, and low. The circuit structures are identical, and each level receives switching signals from the controller circuit through transistors U2, U3, and U5 to control the on / off state of the corresponding indicator light circuit.

[0012] Preferably, the power chip U4 in the heating switch circuit receives the switching signal from the controller circuit and controls the heating output to adjust the heating temperature.

[0013] Compared with the prior art, the technical effects and advantages of this utility model are as follows: By integrating NTC components directly onto the circuit board, the need for external NTC components such as wires and terminals is eliminated, reducing material costs and connection points, lowering the probability of malfunctions such as poor contact, and significantly improving the overall reliability of the product.

[0014] Onboard NTC design can optimize the temperature sensing area by combining with the circuit board layout. Compared with external NTCs that are small in size and have limited temperature sensing area, it can more accurately and comprehensively reflect the actual temperature of the controlled object, effectively improving the accuracy of temperature control.

[0015] NTC components are directly integrated into the circuit board, avoiding the positional deviation problems that are prone to occur during production and assembly due to the small size of external NTCs. This reduces temperature control deviations caused by installation position deviations and improves the consistency and stability of product production. Attached Figure Description

[0016] Figure 1 This is the overall circuit diagram of the circuit board of this utility model; Figure 2 This is the circuit diagram of the controller of this utility model; Figure 3 This is the power supply voltage regulator circuit diagram of this utility model; Figure 4 This is the voltage measurement circuit diagram of this utility model; Figure 5 This is the NTC circuit diagram of this utility model; Figure 6 This is a circuit diagram of the switch signal input circuit of this utility model; Figure 7 This is the circuit diagram of the indicator light of this utility model; Figure 8 This is the circuit diagram of the heating switch of this utility model; Figure 9 This is a cross-sectional view of the heating controller with integrated NTC according to this utility model.

[0017] In the diagram: 1. Controller circuit; 2. Power supply regulator circuit; 3. Voltage measurement circuit; 4. NTC circuit; 5. Switch signal input circuit; 6. Indicator light circuit; 7. Heating switch circuit; 8. Circuit board; 9. Wires; 10. Housing. Detailed Implementation The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed", "equipped with", "sleeved with", "connected", etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0019] Please see Figure 1-9 This utility model provides a technical solution: a heating controller with integrated NTC, including a housing 10, a circuit board 8 and wires 9; The outer casing 10 is mainly used to wrap the circuit board and wire solder joints to increase the tensile strength of the wires and protect the circuit board 8. At the same time, because it uses polyurethane with high thermal conductivity, it is beneficial to the internal NTC temperature sensing.

[0020] The circuit board 8 integrates a controller circuit 1, a power supply regulator circuit 2, a voltage measurement circuit 3, an NTC circuit 4, a switch signal input circuit 5, an indicator light circuit 6, and a heating switch circuit 7. The NTC components in the NTC circuit 4 are directly integrated on the circuit board 2. like Figure 5 As shown, the NTC element in NTC circuit 4 is directly attached to the position of the circuit board 8 near the heating area. When the temperature of the controlled object (such as the seat or steering wheel) changes, the resistance value of the NTC element decreases as the temperature rises (negative temperature coefficient characteristic), causing the output voltage of NTC circuit 4 to change. NTC (TH1): Negative Temperature Coefficient Thermistor. Its resistance decreases as the temperature rises and increases as the temperature falls. It is a temperature detection "sensor," and temperature changes directly alter its resistance value, thereby changing the voltage in the circuit it is connected to.

[0021] R11: Together with NTC (TH1), it forms a voltage divider circuit, which, in conjunction with NTC, converts temperature changes into voltage signals. When the two are connected in series, the total voltage division ratio changes with the resistance of NTC, realizing the conversion of "temperature → resistance → voltage".

[0022] Capacitor C9 mainly serves as a filter, filtering out high-frequency interference signals in the output voltage of the voltage divider circuit, making the voltage input to the subsequent circuit (U1) more stable and smooth, and avoiding noise affecting the accuracy of temperature detection.

[0023] TP2: Test Point, which is convenient for measuring the voltage after voltage division with instruments such as multimeters. It is used for debugging and testing whether the circuit is working properly, and can also be used as the voltage signal input point of U1 (to transmit the voltage corresponding to the temperature to the control unit U1).

[0024] Temperature detection: When the temperature changes, the NTC (TH1) resistor changes. Due to the series voltage division, the voltage at point TP2 changes accordingly (high temperature → low NTC resistance → low TP2 voltage; low temperature → high NTC resistance → high TP2 voltage, and vice versa). The corresponding relationship may also vary depending on the power supply polarity and voltage division method, and needs to be determined in conjunction with the actual circuit power supply.

[0025] Signal transmission: The voltage signal output by TP2 is input to the control unit U1. U1 identifies the temperature state corresponding to the voltage based on the preset temperature threshold (such as "heating should be turned off when the temperature is too high and turned on when the temperature is too low"), and then controls the on and off of the heating circuit to achieve automatic temperature adjustment.

[0026] The controller circuit 1 acquires the voltage signal in real time, converts it into the actual temperature value through an internal algorithm, and compares it with the preset target temperature range (such as 25℃-50℃). When the temperature is lower than the lower limit, the heating switch circuit 7 is controlled to turn on the heating. When the temperature reaches the upper limit, the heating switch circuit 7 is controlled to turn off the heating, forming a closed-loop temperature control to ensure that the temperature of the controlled object is stable within the set range.

[0027] The outer casing 10 is used to enclose the circuit board 8 and the solder joints of the wires 9 and the circuit board 8. The wires 9 are used to connect the power supply and transmit control signals. Temperature signals are acquired by an NTC element, processed by controller circuit 1, and then controlled by heating switch circuit 7. At the same time, the heating status is displayed by indicator light circuit 6.

[0028] The housing 10 is made of highly thermally conductive polyurethane to enhance the tensile strength of the conductor 9, protect the circuit board 8, and facilitate the temperature sensing of the NTC components.

[0029] like Figure 3 As shown, the power supply regulator circuit 2 includes a reverse connection protection diode D1, a Zener diode D2, a resistor R5, and a capacitor C4. The reverse connection protection diode D1 is used to protect the circuit when the power supply is reversed. The Zener diode D2, the resistor R5, and the capacitor C4 work together to adjust the input power supply voltage to 5V to power the control circuit.

[0030] The power supply regulator circuit 2 is the core of the entire controller's power supply. Its input terminal is connected to an external power source through wire 9, and its output terminal is connected to modules that require stable voltage, such as the controller circuit 1, voltage measurement circuit 3, and switch signal input circuit 5.

[0031] The reverse polarity protection diode D1 is connected in series at the power input terminal. When the positive and negative terminals of the external power supply are reversed, D1 is in the reverse cut-off state, cutting off the power supply to the circuit and preventing reverse voltage from damaging sensitive components such as controller circuit 1. Zener diode D2, resistor R5, and capacitor C4 form a 5V voltage regulator branch. The external power supply first passes through R5 after passing through D1, then D2 stabilizes the voltage to 5V, and finally C4 filters out high-frequency noise to form a stable 5V DC voltage. This provides the operating power for the chip in controller circuit 1 and other low-voltage circuits, ensuring that each circuit can still operate stably when the voltage fluctuates.

[0032] like Figure 2As shown, the controller circuit 1 receives signals transmitted from the voltage measurement circuit 3, the switch signal input circuit 5, and the NTC circuit 4, and controls the indicator light circuit 6 and the heating switch circuit 7. The controller circuit 1 converts the analog voltage signal from the voltage measurement circuit 3 and the temperature sensing voltage signal from the NTC circuit 4 into digital signals through the built-in AD conversion module, and at the same time directly reads the high and low level signals transmitted from the switch signal input circuit 5. Based on the preset control algorithm (such as temperature threshold, voltage protection range, gear switching logic), the input signal is comprehensively analyzed to generate corresponding control commands: output a switch signal to the indicator light circuit 6 to control the indicator light to turn on or off, and output a PWM signal or high / low level signal to the heating switch circuit 7 to control the heating output power or on / off state.

[0033] like Figure 4 As shown, the voltage measurement circuit 3 is used to monitor changes in the power supply voltage. When the voltage is too high or too low, the controller circuit 1 controls the heating switch circuit 7 to turn off the heating based on the signal from this circuit to prevent circuit damage.

[0034] The components and circuit control principle of voltage measurement circuit 3 are as follows: R1 and R2 are voltage divider resistors connected in series between the power supply and ground to proportionally reduce the high power supply voltage. For example, if the power supply voltage is V, after being divided by R1 and R2, the high voltage is converted to a low voltage suitable for U1 detection.

[0035] C1: Filter capacitor, connected in parallel across R2. Its function is to filter the voltage signal after voltage division, making the voltage output of TP23 smoother and avoiding misjudgment of U1 due to power fluctuations or high-frequency interference.

[0036] TP23: Test point, connected to the voltage detection pin of U1, transmits the voltage signal after voltage division and filtering to U1, which serves as the basis for U1 to determine whether the power supply voltage is normal.

[0037] Circuit working logic Voltage detection: When the power supply voltage changes, the voltage division result of R1 and R2 (TP23 voltage) changes synchronously. For example, if the power supply is overvoltage (too high voltage), the TP23 voltage will increase proportionally; if the power supply is undervoltage (too low voltage), the TP23 voltage will decrease proportionally.

[0038] Signal transmission: TP23 inputs the changing voltage signal into U1. U1 has a "voltage threshold judgment" logic (such as preset overvoltage threshold V_high and undervoltage threshold V_low).

[0039] Protection action: When U1 detects that the voltage of TP23 > V_high (overvoltage) or < V_low (undervoltage), it triggers the protection mechanism (such as shutting down the heating circuit) to prevent abnormal voltage from damaging the device; if the voltage is within the normal range, U1 keeps the circuit in the normal working state.

[0040] As Figure 6 shown, the switch signal input circuit 5 needs to be externally connected to a control switch. When the switch is pressed, the circuit voltage is 0V, and when the switch is off, the circuit voltage is 5V. The controller circuit 1 realizes the switching of the heating working state among off, high, medium, low, and off by measuring this voltage signal.

[0041] The components included in the switch signal input circuit 5 and the circuit control principle are as follows: External switch (SWITCH): The "input source" of the circuit. When it is off, the circuit is at a high level (5V), and when it is pressed, the circuit is grounded (voltage 0V), changing the circuit voltage state through on / off.

[0042] R4: Pull-up resistor, one end connected to the power supply (default provides 5V voltage, the power supply terminal is not marked in the figure but the logic is implicit), and the other end connected to TP6. Its function is to "pull up" the high level (5V) for the circuit when the switch is off, ensuring that TP6 can stably output a 5V signal when the switch is off.

[0043] C3, C6: Filter capacitors, respectively connected in parallel between the circuit and the ground. Their function is to filter out high-frequency interference in the voltage signal, make the voltage input to U1 more stable, and avoid false triggering of state switching by clutter.

[0044] R6, R8: Voltage division / current limiting assistance. R6 is connected in series in the signal path to limit the loop current; one end of R8 is grounded, cooperating with R6 (and may also assist C6 in filtering) to make the voltage signal smoother and ensure the stability of the circuit's static operating point.

[0045] TP4, TP6: Test points. TP6 is close to the switch side to detect the initial signal voltage; TP4 is close to the subsequent stage (connected to U1) to transmit the stable voltage signal after processing, facilitating debugging and detecting the circuit state.

[0046] When the switch is off: Through the pull-up effect of R4, the voltages at TP6 and TP4 points are "pulled" to 5V. This 5V signal is filtered by C3, R6, R8, and C6 and then stably input to U1. U1 recognizes 5V and performs the corresponding heating state switching (in the cycle of "off - high - medium - low - off", specifically depending on the U1 program logic).

[0047] When the switch is pressed: The switch grounds the circuit, and the voltages at TP6 and TP4 points are pulled down to 0V. The 0V signal is also filtered and then input to U1. U1 recognizes 0V and triggers the heating state switching again.

[0048] like Figure 7 As shown, the indicator light circuit 6 is divided into three levels: high, medium, and low. The circuit structures are the same, and each level receives the switching signals from the controller circuit 1 through transistors U2, U3, and U5 to control the on / off state of the indicator light circuit for the corresponding level.

[0049] The indicator circuit 6 includes three indicator light branches: high, medium, and low. Each branch consists of a transistor (U2 corresponds to the high level, U3 to the medium level, and U5 to the low level), a current-limiting resistor, and an LED. The base of the transistor is connected to the output of the controller circuit 1, the collector is connected to the 5V voltage of the power supply regulator circuit 2 through the LED, and the emitter is grounded.

[0050] like Figure 8 As shown, the power chip U4 in the heating switch circuit 7 receives the switching signal from the controller circuit 1 and controls the heating output to adjust the heating temperature.

[0051] The components and control principle of the heating switch circuit 7 are as follows: U4 (power chip): The circuit's "execution core," receiving the switching signal from U1 (through pins such as TP14), controlling the on / off state of its own OUT terminal, and thus determining whether the Heater is working.

[0052] R9 and R10: Current limiting / voltage dividing resistors. R9 is connected to TP7 and TP13, and R10 is connected to TP8 and TP12. Their function is to limit the signal loop current, protect the U4 pin, and also assist in voltage division to match the signal voltage requirements of U4.

[0053] C8 and C11: Filter capacitors. C8 is connected in parallel between TP8 and ground, and C11 is connected in parallel between TP22 (Heater terminal) and ground. They filter high-frequency interference in the voltage signal, making the input signal of U4 and the output voltage to the Heater more stable.

[0054] R12 and R13: Auxiliary resistors. R12 is connected to TP12 and ground to form a voltage divider or provide a voltage reference. R13 is connected to TP14 and ground, and together with the DEN pin of U4, it is used to set the enable condition or the static operating point.

[0055] R14: Current sensing / limiting resistor, connected in series between the IS pin of U4 and ground. It can sense the current in the output circuit of U4 (for overcurrent protection or feedback) and also limit the operating current of U4 itself.

[0056] Test points (TP7 / 8 / 12 / 13 / 14 / 15 / 22): Used for debugging and testing. For example, TP14 receives the switching signal from U1, and TP22 outputs the voltage controlling the Heater. By measuring the voltage at these points, it can be determined whether the circuit is normal.

[0057] Control flow (signal transfer) Signal input: The switching signal of U1 (such as high or low level) is transmitted to TP14 through the front-end circuit and enters the IN pin of U4. At the same time, the DEN, IS and other pins of U4 are used to construct auxiliary conditions such as enable and current feedback through components such as R13 and R14.

[0058] U4 processing: U4 controls the on / off state of the OUT terminal based on the switch signal of the IN pin (combined with DEN enable, IS current detection, etc.): when the signal is "on", OUT is turned on and the Heater is energized and heated; when the signal is "off", OUT is turned off and the Heater stops heating.

[0059] Output and Protection: C11 filters voltage fluctuations at the Heater terminal, R14 monitors the output current of U4 in real time, and if overcurrent occurs, it can trigger U4 protection (some power chips have built-in overcurrent protection logic) to ensure circuit safety; R9, R10, C8 and other components regulate and filter the signal input side, allowing U4 to stably recognize switching commands.

[0060] Specifically, when using it, 1. Power supply and initialization Power supply regulation: The power supply regulation circuit 2 prevents the circuit from being damaged by reverse connection through the anti-reverse connection diode D1, and then the Zener diode D2, resistor R5 and capacitor C4 work together to convert the input power supply into a stable 5V voltage to power the controller circuit 1 and other low voltage modules.

[0061] System ready: Controller circuit 1 completes initialization and loads preset parameters (such as temperature threshold, voltage protection range, etc.), and indicator circuit 6 enters standby mode after self-test.

[0062] 2. Signal Acquisition Temperature acquisition (NTC circuit 4): The NTC component (TH1) changes its own resistance due to the temperature change of the controlled object (seat, steering wheel, etc.), and forms a voltage divider circuit with R11 to convert the temperature change into a voltage signal. After being filtered by C9, it is transmitted to the controller circuit 1 by TP2.

[0063] Voltage acquisition (voltage measurement circuit 3): The voltage divider circuit of R1 and R2 converts the power supply voltage into a low voltage suitable for the controller to detect. After filtering by C1, TP23 transmits the voltage signal to the controller circuit 1 to monitor whether the power supply voltage is normal.

[0064] Switch signal acquisition (switch signal input circuit 5): The external switch changes the circuit voltage when it is turned on and off. When it is off, R4 pulls up so that TP6 and TP4 are 5V. When it is pressed, it is grounded and 0V. After being filtered by C3, C6, etc., the voltage signal is transmitted to the controller circuit 1.

[0065] 3. Signal Processing and Control Decisions Signal conversion and analysis: The controller circuit 1 converts the analog voltage signals of the voltage measurement circuit 3 and the NTC circuit 4 into digital signals through the AD conversion module, reads the high and low level signals of the switch signal input circuit 5, and analyzes them in combination with the preset control algorithm (temperature threshold, voltage protection, gear switching logic, etc.).

[0066] Control command generation: Temperature control: The controller converts the signal from the NTC circuit into the actual temperature and compares it with the target temperature range. If the temperature is below the lower limit, the heating switch circuit 7 is activated to turn on the heating. If the temperature reaches the upper limit, the heating is turned off, thus achieving closed-loop temperature control.

[0067] Voltage protection: If an overvoltage (>V_high) or undervoltage (<V_low) is detected from the voltage measurement circuit 3, the heating switch circuit 7 is triggered to shut off the heating and protect the circuit.

[0068] Heating level switching: Based on the voltage signal of the switch signal input circuit 5, the heating level is switched according to the logic of "off-high-medium-low-off".

[0069] 4. Implementation and Feedback Heating control (heating switch circuit 7): Power chip U4 receives signals from controller circuit 1 and controls the heating output. By changing the output signal (PWM or high / low level), the heating power is adjusted or switched on / off to achieve temperature regulation; at the same time, components such as R14 detect the current to ensure circuit safety.

[0070] Status display (indicator circuit 6): The output signal of controller circuit 1 controls the transistors U2, U3, and U5 to turn on / off, corresponding to the high, medium, and low gear indicator lights, providing feedback on the heating working status.

[0071] Finally, it should be noted that the above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A heating controller integrating NTC, characterized in that, Includes a housing (10), a circuit board (8), and wires (9); The circuit board (8) integrates a controller circuit (1), a power supply regulator circuit (2), a voltage measurement circuit (3), an NTC circuit (4), a switch signal input circuit (5), an indicator light circuit (6), and a heating switch circuit (7). The NTC components in the NTC circuit (4) are directly integrated on the circuit board (8). The outer shell (10) is used to enclose the circuit board (8) and the solder joints of the wires (9) and the circuit board (8). The wires (9) are used to connect the power supply and transmit control signals. Temperature signals are collected by NTC components, processed by controller circuit (1), and then controlled by heating switch circuit (7). At the same time, the heating working status is displayed by indicator light circuit (6).

2. The heating controller with integrated NTC according to claim 1, characterized in that: The outer casing (10) is made of highly thermally conductive polyurethane to enhance the tensile strength of the conductor (9), protect the circuit board (8), and facilitate the temperature sensing of the NTC component.

3. A heating controller with integrated NTC according to claim 1, characterized in that: The power supply regulator circuit (2) includes a reverse connection protection diode D1, a Zener diode D2, a resistor R5, and a capacitor C4. The reverse connection protection diode D1 is used to protect the circuit when the power supply is reversed. The Zener diode D2, the resistor R5, and the capacitor C4 work together to adjust the input power supply voltage to 5V to power the control circuit.

4. A heating controller with integrated NTC according to claim 1, characterized in that: The controller circuit (1) receives signals transmitted from the voltage measurement circuit (3), the switch signal input circuit (5) and the NTC circuit (4) and controls the indicator light circuit (6) and the heating switch circuit (7).

5. A heating controller with integrated NTC according to claim 1, characterized in that: The voltage measurement circuit (3) is used to monitor changes in power supply voltage. When the voltage is too high or too low, the controller circuit (1) controls the heating switch circuit (7) to turn off the heating according to the circuit signal to prevent circuit damage.

6. A heating controller with integrated NTC according to claim 1, characterized in that: The switch signal input circuit (5) needs to be connected to an external control switch. When the switch is pressed, the circuit voltage is 0, and when the switch is opened, the circuit voltage is 5V. The controller circuit (1) realizes the switching of the heating working state between off, high, medium, low and off by measuring the voltage signal of the switch signal input circuit (5).

7. A heating controller with integrated NTC according to claim 1, characterized in that: The indicator light circuit (6) is divided into three levels: high, medium, and low. The circuit structure is the same. It receives the switching signals of the controller circuit (1) through transistors U2, U3, and U5 respectively, and controls the on / off of the corresponding indicator light circuit.

8. A heating controller with integrated NTC according to claim 1, characterized in that: The power chip U4 in the heating switch circuit (7) receives the switching signal from the controller circuit (1) and controls the heating output to adjust the heating temperature.

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