Heating power control device

Abstract

The utility model provides a heating power control device, and belongs to the technical field of heating control. The heating power control device comprises a pulse generation module, a pulse frequency regulation module, a heating control module and a temperature detection module, the first output end of the pulse generation module is connected with the input end of the pulse frequency adjusting module, and the output end of the pulse frequency adjusting module is connected with the control end of the pulse generation module. The second output end of the pulse generation module is connected with the first input end of the heating control module, the second input end of the heating control module is connected with the temperature detection module, and the temperature detection module is used for detecting the temperature of the heating device; the output end of the heating control module is connected with the heating device which is used for heating. The temperature control precision of the heating system can be improved.

Description

Technical Field

[0001] This disclosure relates to the field of heating control technology, and in particular to a heating power control device. Background Technology

[0002] In modern industrial production and daily life, precise temperature control is crucial for improving product quality, optimizing energy efficiency, and ensuring safe operation. Traditional heating systems often suffer from slow response, limited temperature control accuracy, and high energy consumption, making it difficult to meet the growing demand for high-efficiency and high-precision heating. Especially in applications such as materials processing, chemical reaction control, food processing, and environmental temperature control, accurately controlling heating power to achieve rapid and stable temperature regulation is a pressing technical challenge. Utility Model Content

[0003] This disclosure provides a heating power control device to solve the problem of low temperature control accuracy in traditional heating systems.

[0004] This disclosure provides a heating power control device, including a pulse generation module, a pulse frequency adjustment module, a heating control module, and a temperature detection module;

[0005] The first output terminal of the pulse generation module is connected to the input terminal of the pulse frequency adjustment module, and the output terminal of the pulse frequency adjustment module is connected to the control terminal of the pulse generation module.

[0006] The second output terminal of the pulse generation module is connected to the first input terminal of the heating control module, and the second input terminal of the heating control module is connected to the temperature detection module, which is used to detect the temperature of the heating device.

[0007] The output of the heating control module is connected to a heating device, which is used for heating.

[0008] In one exemplary embodiment of this disclosure, the heating control module includes a comparison module and a control module;

[0009] The first input terminal of the comparison module is connected to the second output terminal of the pulse generation module, and the second input terminal of the comparison module is connected to the temperature detection module.

[0010] The output of the comparison module is connected to the input of the control module, and the output of the control module is connected to the heating device.

[0011] In one exemplary embodiment of this disclosure, a current detection module and an alarm module are also included;

[0012] The input terminal of the current detection module is connected to the heating device, and the output terminal of the current detection module is connected to the alarm module. The alarm module is configured to issue an alarm signal when the operating current of the heating device exceeds a set threshold.

[0013] In one exemplary embodiment of this disclosure, the pulse generation module includes resistor R1, resistor R2, capacitor C2, controller U2, resistor R4, capacitor C3, and diode D1;

[0014] The first end of resistor R1 is connected to the VCC power supply, the second end of resistor R1 is connected to the discharge terminal of controller U2, the second end of resistor R1 is connected to the first end of resistor R2, the second end of resistor R2 is connected to both the high trigger terminal and the low trigger terminal of controller U2, the second end of resistor R2 is grounded through capacitor C2, the output terminal of controller U2 is connected to the first end of resistor R4, the second end of resistor R4 is grounded through capacitor C3, the second end of resistor R4 is connected to the anode of diode D1, the cathode of diode D4 is connected to the first end of resistor R4, the second end of resistor R4 is connected to the first input terminal of the heating control module, and the second end of resistor R4 serves as the second output terminal of the pulse generation module.

[0015] In one exemplary embodiment of this disclosure, the pulse frequency adjustment module includes transistor Q2, transistor Q1, light-emitting diode LED1, and photoresistor R3;

[0016] The base of the transistor Q1 is connected to the first terminal of the resistor R4, and the first terminal of the resistor R4 serves as the first output terminal of the pulse generation module.

[0017] The base of transistor Q1 is connected to the base of transistor Q2, the collector of transistor Q1 is connected to VCC power supply, the emitter of transistor Q1 is connected to the emitter of transistor Q2, the collector of transistor Q2 is grounded, the emitter of transistor Q2 is connected to the anode of light-emitting diode LED1, and the cathode of light-emitting diode LED1 is grounded.

[0018] The first end of the photoresistor R3 is connected to the second end of the resistor R2, and the second end of the photoresistor R3 is connected to the high trigger terminal of the controller U2.

[0019] In one exemplary embodiment of this disclosure, the heating control module includes an operational amplifier U4, a resistor R8, and a switching transistor Q3;

[0020] The non-inverting input of the operational amplifier U4 serves as the first input of the heating control module. The inverting input of the operational amplifier U4 is connected to the temperature detection module. The output of the operational amplifier U4 is connected to the control terminal of the switching transistor Q3 through the resistor R8. The first terminal of the switching transistor Q3 is connected to the first power supply terminal of the heating device. The second power supply terminal of the heating device is connected to the VDD power supply. The second terminal of the switching transistor Q3 is grounded.

[0021] In one exemplary embodiment of this disclosure, the temperature detection module includes a temperature sensor U3, a resistor R15, a resistor R13, an operational amplifier U5, and a resistor R14;

[0022] The power supply terminal of the temperature sensor U3 is connected to the VCC power supply, the ground terminal of the temperature sensor U3 is grounded, the output terminal of the temperature sensor U3 is connected to the non-inverting input terminal of the operational amplifier U5 through the resistor R13, the inverting input terminal of the operational amplifier U5 is grounded through the resistor R15, the output terminal of the operational amplifier U5 is connected to the inverting input terminal of the operational amplifier U5 through the resistor R14, and the output terminal of the operational amplifier U5 is connected to the second input terminal of the heating control module.

[0023] In one exemplary embodiment of this disclosure, the temperature detection module further includes a Zener diode ZD1, a resistor R10, a resistor R12, an operational amplifier U1, and a transistor Q4;

[0024] The cathode of the Zener diode ZD1 is connected to the VCC power supply, the anode of the Zener diode ZD1 is grounded through the resistor R10, the anode of the Zener diode ZD1 is connected to the non-inverting input terminal of the operational amplifier U1, the output terminal of the operational amplifier U1 is connected to the base of the transistor Q4, the emitter of the transistor Q4 is connected to the power supply terminal of the temperature sensor U3, the collector of the transistor Q4 is connected to the VCC power supply, and the collector of the transistor Q4 is connected to the inverting input terminal of the operational amplifier U1.

[0025] The beneficial effects of the heating power control device provided in this embodiment are as follows:

[0026] This embodiment of the invention significantly improves the accuracy and stability of the heating process by integrating a pulse generation module, a pulse frequency adjustment module, a heating control module, and a temperature detection module. The dual-output design of the pulse generation module ensures precise pulse frequency adjustment, preventing changes in pulse signal frequency or pulse width under complex working conditions. It also directly provides control signals to the heating control module, simplifying the heating control process. The introduction of the pulse frequency adjustment module enables this embodiment to monitor and adjust the pulse signal frequency in real time, thereby ensuring stable heating power output. The real-time feedback function of the temperature detection module provides accurate temperature information to the heating control module, achieving closed-loop control of the heating power and ensuring that the heating device maintains a constant heating effect even under real-time temperature changes. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a structural block diagram of a heating power control device provided in one embodiment of the present disclosure;

[0029] Figure 2 This is a structural block diagram of a heating power control device provided in another embodiment of the present disclosure;

[0030] Figure 3 This is a circuit diagram of a heating power control device provided in one embodiment of the present disclosure;

[0031] Figure 4 This is a circuit diagram of a temperature detection module provided in one embodiment of the present disclosure. Detailed Implementation

[0032] To enable those skilled in the art to better understand this solution, the technical solutions in the embodiments of this solution will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this solution, not all of them. Based on the embodiments of this solution, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this solution.

[0033] The term "comprising" and any other variations thereof in the specification, claims, and accompanying drawings of this invention mean "including but not limited to," and are intended to cover a non-exclusive inclusion, not limited to the examples listed herein. Furthermore, the terms "first" and "second," etc., are used to distinguish different objects, not to describe a specific order.

[0034] The implementation of this disclosure will be described in detail below with reference to the specific accompanying drawings:

[0035] Figure 1 This is a schematic diagram of a heating power control device provided in an embodiment of this disclosure. (Refer to...) Figure 1 The heating power control device includes a pulse generation module, a pulse frequency adjustment module, a heating control module, and a temperature detection module;

[0036] The first output terminal of the pulse generator module is connected to the input terminal of the pulse frequency adjustment module, and the output terminal of the pulse frequency adjustment module is connected to the control terminal of the pulse generator module.

[0037] The second output terminal of the pulse generation module is connected to the first input terminal of the heating control module, and the second input terminal of the heating control module is connected to the temperature detection module, which is used to detect the temperature of the heating device.

[0038] The output of the heating control module is connected to the heating device, which is used for heating.

[0039] In this embodiment, the pulse generation module is used to generate the original pulse signal. This pulse signal is the basis for controlling the heating power. In practical applications, the working environment of the heating system is often complex, which can easily cause changes in the frequency or pulse width of the pulse signal output by the pulse generation module. The pulse width and frequency of the pulse signal output by the pulse generation module directly affect the energy output of the heating process. Therefore, in this embodiment, the output of the pulse generation module is divided into two paths: one path is used for frequency adjustment, and the other path directly participates in heating control.

[0040] The pulse generation module outputs two different pulse signals. In this embodiment, the pulse signal output from the first output terminal of the pulse generation module can be a rectangular pulse signal, and the pulse signal output from the second output terminal of the pulse generation module can be a sawtooth wave signal. Both the rectangular pulse signal and the sawtooth wave signal have the same frequency and are the original pulse signals. The first output terminal of the pulse generation module is connected to a pulse frequency adjustment module. This module receives the original pulse signal (such as a rectangular pulse signal) and converts it into an analog signal. It uses this analog signal to determine whether the frequency or pulse width of the original pulse signal (such as a rectangular pulse signal) has changed. When the frequency or pulse width of the original pulse signal (such as a rectangular pulse signal) changes, the change is fed back to the control terminal of the pulse generation module through the output terminal of the pulse frequency adjustment module, thereby achieving precise control of the output pulse frequency of the pulse generation module.

[0041] The heating control module receives pulse signals (such as sawtooth wave signals) from the second output of the pulse generation module and temperature information from the temperature detection module. Based on this information, the heating control module can determine whether the power output of the heating device needs to be adjusted. If adjustment is required, the heating control module sends a corresponding control signal to the heating device to change its heating power. The temperature detection module is used to detect the actual temperature of the heating device in real time and convert the detected temperature signal into a corresponding electrical signal, which is then sent to the second input of the heating control module to achieve closed-loop control, ensuring that this embodiment can respond by adjusting the heating power based on real-time temperature feedback.

[0042] As can be seen from the above, this embodiment significantly improves the accuracy and stability of the heating process by integrating a pulse generation module, a pulse frequency adjustment module, a heating control module, and a temperature detection module. The dual-output design of the pulse generation module ensures precise pulse frequency adjustment, preventing changes in pulse signal frequency or pulse width under complex working conditions. It also directly provides control signals to the heating control module, simplifying the heating control process. The introduction of the pulse frequency adjustment module enables this embodiment to monitor and adjust the pulse signal frequency in real time, thereby ensuring stable heating power output. The real-time feedback function of the temperature detection module provides accurate temperature information to the heating control module, realizing closed-loop control of heating power and ensuring that the heating device maintains a constant heating effect even under real-time temperature changes.

[0043] like Figure 2 As shown, in one embodiment of this disclosure, the heating control module includes a comparison module and a control module;

[0044] The first input terminal of the comparison module is connected to the second output terminal of the pulse generation module, and the second input terminal of the comparison module is connected to the temperature detection module.

[0045] The output of the comparison module is connected to the input of the control module, and the output of the control module is connected to the heating device.

[0046] In this embodiment, the second output terminal of the pulse generation module (e.g., outputting a sawtooth wave signal) is connected to the first input terminal of the comparison module. This pulse signal represents a preset value of the heating power. The temperature detection module detects the actual temperature of the heating device and converts the detected temperature signal into a corresponding electrical signal, which is then sent to the second input terminal of the comparison module.

[0047] The comparison module receives a preset power signal from the pulse generation module and an actual temperature signal from the temperature detection module, and then compares these two signals. In this embodiment, the comparison module compares the sawtooth wave signal with the electrical signal corresponding to the temperature and outputs a rectangular wave signal. This rectangular wave signal is sent to the control module, which provides heating power to the heating device. When the voltage output by the temperature detection module changes, the duty cycle of the rectangular wave signal output by the comparison module will change. Based on the output signal of the comparison module, the control module sends a corresponding control signal to the heating device. That is, the power provided by the control module to the heating device will change to achieve precise control of the heating device's power.

[0048] In this embodiment, the comparison module can compare the preset power signal with the actual temperature signal in real time, ensuring that the heating device always operates within the set temperature range. When the actual temperature deviates from the set value, the comparison module quickly adjusts the duty cycle of the output signal, and the control module adjusts the power of the heating device accordingly, thereby achieving precise control of the heating power. This embodiment not only improves heating efficiency but also effectively reduces energy consumption, ensuring the safety and stability of the heating process.

[0049] like Figure 2 As shown, in one embodiment of this disclosure, a current detection module and an alarm module are also included;

[0050] The input terminal of the current detection module is connected to the heating device, and the output terminal of the current detection module is connected to the alarm module. The alarm module is configured to issue an alarm signal when the operating current of the heating device exceeds a set threshold.

[0051] In this embodiment, a current detection module and an alarm module are also introduced. The current detection module and the alarm module work together to monitor the operating status of the heating device and provide safety protection when necessary.

[0052] In this embodiment, the heating device generates a certain current during operation. The input terminal of the current detection module is directly connected to the heating device. For example, a current sensor is connected in series in the power supply circuit of the heating device. This current sensor is used to monitor the operating current of the heating device in real time, and the current detection module converts this current value into a corresponding voltage signal. The output terminal of the current detection module is connected to the alarm module. The alarm module has a voltage threshold set internally. When the voltage signal output by the current detection module exceeds this threshold, the alarm module is triggered and an alarm signal is issued. The alarm signal can be an audible sound, a flashing light, or an electrical signal sent to the control center to promptly notify the operator or the system.

[0053] In this embodiment, the current detection module can monitor the operating current of the heating device in real time, ensuring that it operates within a safe range; while the alarm module can quickly issue an alarm signal when the current exceeds a set threshold, effectively preventing safety accidents and equipment damage caused by overcurrent. This not only enhances the self-protection capability of the heating system and extends the service life of the equipment, but also improves the stability and reliability of the system.

[0054] like Figure 3 As shown, in one embodiment of this disclosure, the pulse generation module includes resistor R1, resistor R2, capacitor C2, controller U2, resistor R4, capacitor C3, and diode D1; the first end of resistor R1 is connected to the VCC power supply, the second end of resistor R1 is connected to the discharge terminal of controller U2, the second end of resistor R1 is connected to the first end of resistor R2, the second end of resistor R2 is connected to the high trigger terminal and the low trigger terminal of controller U2 respectively, the second end of resistor R2 is grounded through capacitor C2, the output terminal of controller U2 is connected to the first end of resistor R4, the second end of resistor R4 is grounded through capacitor C3, the second end of resistor R4 is connected to the anode of diode D1, the cathode of diode D4 is connected to the first end of resistor R4, the second end of resistor R4 is connected to the first input terminal of the heating control module, and the second end of resistor R4 serves as the second output terminal of the pulse generation module.

[0055] In this embodiment, a 555 timer can be used as the controller U2. Resistors R1 and R2, capacitor C2, controller U2, resistor R4, capacitor C3, and diode D1 constitute a pulse generation circuit. The output terminal of controller U2 is connected to the first terminal of resistor R4. When controller U2 is triggered, the output terminal of controller U2 will output a pulse signal. This pulse signal is a rectangular wave signal. The pulse signal output by controller U2 will be sent to the input terminal of the pulse frequency adjustment module.

[0056] When the output of controller U2 is high, the high-level signal charges capacitor C3 through resistor R4, and the voltage on capacitor C3 slowly rises. When the output of controller U2 changes from high to low, capacitor C3 discharges rapidly through diode D1 to resistor R4, and the voltage on capacitor C3 drops rapidly to 0. When the output of controller U2 changes from low to high, capacitor C3 enters the charging state again, thus forming a cycle, thereby generating a sawtooth wave signal on capacitor C3. This sawtooth wave signal is sent to the first input of the heating control module.

[0057] The frequency and duty cycle of the pulse signal output by controller U2 depend on the values ​​of resistors R1, R2 and capacitor C2.

[0058] In this embodiment, a 555 timer is used as the core controller U2, which allows for flexible adjustment of the pulse signal frequency and duty cycle, providing precise control signals for the subsequent heating control module. The entire pulse generation module is simple in structure, low in cost, and highly reliable, providing strong support for the precise control of the heating equipment and improving the equipment's working efficiency and stability.

[0059] like Figure 3 As shown, in one embodiment of this disclosure, the pulse frequency adjustment module includes transistor Q2, transistor Q1, light-emitting diode LED1, and photoresistor R3; the base of transistor Q1 is connected to the first end of resistor R4, and the first end of resistor R4 serves as the first output terminal of the pulse generation module; the base of transistor Q1 is connected to the base of transistor Q2, the collector of transistor Q1 is connected to VCC power supply, the emitter of transistor Q1 is connected to the emitter of transistor Q2, the collector of transistor Q2 is grounded, the emitter of transistor Q2 is connected to the anode of light-emitting diode LED1, and the cathode of light-emitting diode LED1 is grounded; the first end of photoresistor R3 is connected to the second end of resistor R2, and the second end of photoresistor R3 is connected to the high trigger terminal of controller U2.

[0060] In this embodiment, the input terminal of the pulse frequency adjustment module is connected to the output terminal of the controller U2. The output terminal of the controller U2 is used to output a rectangular pulse signal. When the signal is high, transistor Q1 is turned on and transistor Q2 is turned off, and the VCC power supply powers the LED1 through transistor Q1. When the signal is low, transistor Q2 is turned on and transistor Q1 is turned off, and the LED1 is not powered. Transistors Q1 and Q2 form a push-pull circuit to improve the driving capability of the rectangular pulse signal. Under the action of the rectangular pulse signal, the push-pull circuit provides operating power to the LED1, and the LED1 is used to generate light signals. When the frequency of the rectangular pulse signal changes, the output power of the LED1 will change, resulting in different light intensities produced by the LED1.

[0061] A photoresistor R3 and a resistor R2 are connected in series. The resistance of the photoresistor R3 can change with the light intensity. In this embodiment, the photoresistor R3 and the light-emitting diode LED1 can be sealed together as a whole in the same space. This way, the photoresistor R3 can only receive the light signal emitted by the light-emitting diode LED1, thereby reducing interference caused by natural light. When the frequency of the pulse signal output by the controller U2 changes, the light intensity of the light-emitting diode LED1 will change, and the resistance of the photoresistor R3 will also change, thus causing the frequency of the pulse signal output by the controller U2 to change.

[0062] In this embodiment, automatic adjustment of the pulse signal frequency can be achieved. A push-pull circuit composed of transistors Q1 and Q2 enhances the driving capability of the pulse signal, ensuring stable operation of the light-emitting diode LED1. Simultaneously, a closed-loop feedback mechanism is formed by sensing the light signal emitted by LED1 using photoresistor R3. When the luminous intensity of LED1 changes, the resistance of photoresistor R3 also changes accordingly. This change is then fed back to the high-trigger terminal of controller U2 through resistor R2, thereby achieving real-time adjustment of the pulse signal frequency. This embodiment not only improves the system's response speed and stability but also enhances the heating system's adaptive capability, enabling the heating system to automatically adjust the pulse signal frequency according to different operating conditions to meet the needs of practical applications.

[0063] like Figure 3 As shown, in one embodiment of this disclosure, the heating control module includes an operational amplifier U4, a resistor R8, and a switching transistor Q3; the non-inverting input terminal of the operational amplifier U4 serves as the first input terminal of the heating control module, the inverting input terminal of the operational amplifier U4 is connected to the temperature detection module, the output terminal of the operational amplifier U4 is connected to the control terminal of the switching transistor Q3 through the resistor R8, the first terminal of the switching transistor Q3 is connected to the first power supply terminal of the heating device, the second power supply terminal of the heating device is connected to the VDD power supply, and the second terminal of the switching transistor Q3 is grounded.

[0064] In this embodiment, operational amplifier U4 constitutes a comparator module, and resistor R8 and switching transistor Q3 constitute a control module. The non-inverting input of operational amplifier U4 serves as the first input of the heating control module, used to receive the sawtooth wave signal from the second output of the pulse generation module. The inverting input of operational amplifier U4 serves as the second input of the heating control module, used to receive the voltage signal output by the temperature detection module.

[0065] After comparing the sawtooth wave signal and the voltage signal corresponding to the temperature, the operational amplifier U4 also outputs a rectangular pulse signal. When the output of operational amplifier U4 is high, the switching transistor Q3 is turned on, and the heating device is powered on. When the output of operational amplifier U4 is low, the switching transistor Q3 is turned off, and the heating device is powered off.

[0066] In this embodiment, when the voltage output by the temperature detection module changes, the duty cycle of the rectangular pulse signal output by the operational amplifier U4 will change within the same signal cycle.

[0067] When the output voltage of the temperature detection module increases, the duty cycle of the rectangular pulse signal output by operational amplifier U4 decreases; conversely, when the output voltage decreases, the duty cycle of the rectangular pulse signal output by operational amplifier U4 increases. A larger duty cycle means a longer conduction time for switching transistor Q3 within the same cycle, increasing the average power of the heating device and thus raising the temperature generated by the heating device. Conversely, a smaller duty cycle means a shorter conduction time for switching transistor Q3 within the same cycle, reducing the average power of the heating device and thus lowering the temperature generated by the heating device.

[0068] In this embodiment, the average power of the heating device is flexibly adjusted by regulating the duty cycle of the rectangular pulse signal. When the output voltage of the temperature detection module changes, the average power of the heating device can be adjusted accordingly to ensure that the temperature generated by the heating device is always maintained within the set range. The heating control module in this embodiment has the characteristics of strong adaptability and high control precision.

[0069] like Figure 4 As shown, in one embodiment of this disclosure, the temperature detection module includes a temperature sensor U3, resistors R15 and R13, an operational amplifier U5, and a resistor R14. The power supply terminal of the temperature sensor U3 is connected to the VCC power supply, the ground terminal of the temperature sensor U3 is grounded, the output terminal of the temperature sensor U3 is connected to the non-inverting input terminal of the operational amplifier U5 through resistor R13, the inverting input terminal of the operational amplifier U5 is grounded through resistor R15, the output terminal of the operational amplifier U5 is connected to the inverting input terminal of the operational amplifier U5 through resistor R14, and the output terminal of the operational amplifier U5 is connected to the second input terminal of the heating control module.

[0070] In this embodiment, temperature sensor U3 is used to detect temperature signals and convert the detected temperature signals into corresponding voltage signals for output. Temperature sensor U3 in this embodiment can be an infrared temperature sensor, a thermistor, etc.

[0071] Taking an infrared temperature sensor as an example, the infrared temperature sensor is used to convert the temperature signal into a corresponding voltage signal output. However, the electrical signal output by the infrared temperature sensor is relatively weak. Therefore, the operational amplifier U5 forms an amplifier circuit to amplify the voltage signal output by the infrared temperature sensor. Finally, the amplified electrical signal is sent to the inverting input terminal of the operational amplifier U4.

[0072] like Figure 4As shown, in one embodiment of this disclosure, the temperature detection module further includes a Zener diode ZD1, resistors R10 and R12, an operational amplifier U1, and a transistor Q4. The cathode of the Zener diode ZD1 is connected to the VCC power supply, the anode of the Zener diode ZD1 is grounded through resistor R10, the anode of the Zener diode ZD1 is connected to the non-inverting input terminal of the operational amplifier U1, the output terminal of the operational amplifier U1 is connected to the base of the transistor Q4, the emitter of the transistor Q4 is connected to the power supply terminal of the temperature sensor U3, the collector of the transistor Q4 is connected to the VCC power supply, and the collector of the transistor Q4 is connected to the inverting input terminal of the operational amplifier U1.

[0073] In this embodiment, when operating in complex environments, the power supply of the temperature detection module may fluctuate with changes in the environment, leading to instability in the power supply and affecting the accuracy of temperature detection. Therefore, a constant current circuit is added to this embodiment.

[0074] The constant current circuit consists of a Zener diode ZD1, resistors R10 and R12, operational amplifier U1, and transistor Q4. Zener diode ZD1 and resistor R10 form a voltage regulator circuit, providing a stable reference voltage to the non-inverting input of operational amplifier U1. Operational amplifier U1 forms a proportional amplifier circuit. During normal operation, operational amplifier U1 outputs a positive voltage signal, which turns on transistor Q4, enabling it to operate in amplification mode. After transistor Q4 turns on, the VCC power supply is applied sequentially through resistor R12 and transistor Q4 to the power supply terminal of temperature sensor U3, thus activating temperature sensor U3.

[0075] When the current flowing through transistor Q4 increases, the operating current of temperature sensor U3 also increases, leading to a larger collector voltage of transistor Q4. This collector voltage is then applied as a sampling voltage to the inverting input of operational amplifier U1. Consequently, the voltage at the inverting input of operational amplifier U1 increases, resulting in a smaller output voltage of operational amplifier U1 and a smaller base current in transistor Q4, thus suppressing the increase in the collector current of transistor Q4. Similarly, when the current flowing through transistor Q4 decreases, the operating current of temperature sensor U3 also decreases, leading to a smaller collector voltage of transistor Q4. This, in turn, results in a smaller voltage at the inverting input of operational amplifier U1, causing a larger output voltage of operational amplifier U1 and a larger base current in transistor Q4, thus suppressing the decrease in the collector current of transistor Q4.

[0076] In this embodiment, by combining temperature sensor U3, operational amplifier U5, and corresponding resistor circuits, accurate detection and amplification of the temperature signal are achieved, ensuring that the temperature detection module can provide accurate temperature data even in complex environments. In particular, by introducing a constant current circuit composed of Zener diode ZD1, resistors R10 and R12, operational amplifier U1, and transistor Q4, the impact of unstable power supply on temperature detection accuracy is effectively resolved. Even under power fluctuations, the operating current of temperature sensor U3 remains constant, thereby improving the stability and reliability of temperature detection.

[0077] The above embodiments are only used to illustrate the technical solutions of this disclosure, and are not intended to limit it. Although this disclosure has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this disclosure.

Claims

1. A heating power control device, characterized in that, It includes a pulse generation module, a pulse frequency adjustment module, a heating control module, and a temperature detection module; The first output terminal of the pulse generation module is connected to the input terminal of the pulse frequency adjustment module, and the output terminal of the pulse frequency adjustment module is connected to the control terminal of the pulse generation module. The second output terminal of the pulse generation module is connected to the first input terminal of the heating control module, and the second input terminal of the heating control module is connected to the temperature detection module, which is used to detect the temperature of the heating device. The output of the heating control module is connected to a heating device, which is used for heating. The pulse generation module includes resistor R1, resistor R2, capacitor C2, controller U2, resistor R4, capacitor C3, and diode D1; The first end of resistor R1 is connected to the VCC power supply, the second end of resistor R1 is connected to the discharge terminal of controller U2, the second end of resistor R1 is connected to the first end of resistor R2, the second end of resistor R2 is connected to both the high trigger terminal and the low trigger terminal of controller U2, the second end of resistor R2 is grounded through capacitor C2, the output terminal of controller U2 is connected to the first end of resistor R4, the second end of resistor R4 is grounded through capacitor C3, the second end of resistor R4 is connected to the anode of diode D1, the cathode of diode D4 is connected to the first end of resistor R4, the second end of resistor R4 is connected to the first input terminal of the heating control module, and the second end of resistor R4 serves as the second output terminal of the pulse generation module. The pulse frequency adjustment module includes transistor Q2, transistor Q1, light-emitting diode LED1, and photoresistor R3; The base of the transistor Q1 is connected to the first terminal of the resistor R4, and the first terminal of the resistor R4 serves as the first output terminal of the pulse generation module. The base of transistor Q1 is connected to the base of transistor Q2, the collector of transistor Q1 is connected to VCC power supply, the emitter of transistor Q1 is connected to the emitter of transistor Q2, the collector of transistor Q2 is grounded, the emitter of transistor Q2 is connected to the anode of light-emitting diode LED1, and the cathode of light-emitting diode LED1 is grounded. The first end of the photoresistor R3 is connected to the second end of the resistor R2, and the second end of the photoresistor R3 is connected to the high trigger end of the controller U2. The heating control module includes operational amplifier U4, resistor R8 and switching transistor Q3; The non-inverting input terminal of the operational amplifier U4 serves as the first input terminal of the heating control module, the inverting input terminal of the operational amplifier U4 is connected to the temperature detection module, the output terminal of the operational amplifier U4 is connected to the control terminal of the switching transistor Q3 through the resistor R8, the first terminal of the switching transistor Q3 is connected to the first power supply terminal of the heating device, the second power supply terminal of the heating device is connected to the VDD power supply, and the second terminal of the switching transistor Q3 is grounded. The temperature detection module includes a temperature sensor U3, a resistor R15, an operational amplifier U5, and a resistor R14. The power supply terminal of the temperature sensor U3 is connected to the VCC power supply, the ground terminal of the temperature sensor U3 is grounded, the output terminal of the temperature sensor U3 is connected to the non-inverting input terminal of the operational amplifier U5 through the resistor R13, the inverting input terminal of the operational amplifier U5 is grounded through the resistor R15, the output terminal of the operational amplifier U5 is connected to the inverting input terminal of the operational amplifier U5 through the resistor R14, and the output terminal of the operational amplifier U5 is connected to the second input terminal of the heating control module. The temperature detection module also includes a Zener diode ZD1, a resistor R10, a resistor R12, an operational amplifier U1, and a transistor Q4; The cathode of the Zener diode ZD1 is connected to the VCC power supply, the anode of the Zener diode ZD1 is grounded through the resistor R10, the anode of the Zener diode ZD1 is connected to the non-inverting input terminal of the operational amplifier U1, the output terminal of the operational amplifier U1 is connected to the base of the transistor Q4, the emitter of the transistor Q4 is connected to the power supply terminal of the temperature sensor U3, the collector of the transistor Q4 is connected to the VCC power supply, and the collector of the transistor Q4 is connected to the inverting input terminal of the operational amplifier U1.

2. The heating power control device as described in claim 1, characterized in that, The heating control module includes a comparison module and a control module; The first input terminal of the comparison module is connected to the second output terminal of the pulse generation module, and the second input terminal of the comparison module is connected to the temperature detection module. The output of the comparison module is connected to the input of the control module, and the output of the control module is connected to the heating device.

3. The heating power control device as described in claim 1, characterized in that, It also includes a current detection module and an alarm module; The input terminal of the current detection module is connected to the heating device, and the output terminal of the current detection module is connected to the alarm module. The alarm module is configured to issue an alarm signal when the operating current of the heating device exceeds a set threshold.

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