Fan control device and heat dissipation device based on analog signals
Patent Information
- Application Number
- CN202522421899.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-14
- Publication Date
- 2026-10-09
- Estimated Expiration
- 2035-11-14
AI Technical Summary
现阶段最为流行的散热系统是基于风冷的散热形式，即合理的风道设计配合风机散热；对于风机的控制，通常也仅仅采用温度控制开关的接通、断开的方法，来控制散热风机是否运转或停止；且温度控制开关对于温度的检测也存在较大的误差，温度可能已经低于了设备的预期温度，温度处理器仍没有控制风机停止工作，容易造成资源的浪费以及影响风机的使用寿命，从而影响电气设备的使用稳定性和使用寿命
[0015]本申请实施例至少包括以下有益效果：本申请提供一种基于模拟信号的风机控制装置和散热装置,该方案通过构建“模拟信号检测单元、CPU/PWM信号处理器、抗干扰处理单元、PWM信号放大单元和风机的完整控制链路，实现多单元协同联动，首先各单元模块化连接明确，模拟信号检测单元精准采集散热系统状态信号，为控制提供可靠依据；CPU/PWM信号处理器作为核心实现信号转换与逻辑运算，保障控制指令的精准生成；其次抗干扰处理单元的接入，有效隔离前级数字控制电路与后级强电驱动电路，大幅降低电机运行等产生的干扰信号对处理器的影响，提升系统稳定性与抗干扰能力；同时PWM信号放大单元强化控制信号驱动能力，确保风机可根据指令实现转速的平滑调节，避免启停冲击。整体电路通过闭环控制逻辑，使风机转速与系统实际散热需求动态匹配，既保证散热效率以维持设备工况稳定，又避免能源浪费，且模块化结构便于装配与维护，提升装置实用性与可靠性，适用于各类智能散热的场景。
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Figure CN224835499U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of heat dissipation control technology, and in particular to a fan control device and a heat dissipation device based on analog signals. Background Technology
[0002] Electrical equipment requires a good heat dissipation system, including both the installation environment and the equipment's own cooling system. Currently, the most popular cooling system is air-cooled, which involves a well-designed airflow system combined with a fan. However, fan control typically relies solely on temperature control switches to turn the fans on and off. These temperature control switches have significant accuracy issues; the temperature may be below the expected level, yet the temperature controller may still not stop the fan, leading to wasted resources and reduced fan lifespan, thus impacting the stability and lifespan of the electrical equipment.
[0003] In summary, the technical problems of low efficiency, high energy consumption, and low precision in air-cooled heat dissipation in related technologies need to be improved. Utility Model Content
[0004] The main objective of this application is to propose a fan control device and a heat dissipation device based on analog signals, which can improve working efficiency, reduce energy consumption, improve control accuracy, and enhance anti-interference capabilities.
[0005] To achieve the above objectives, one aspect of this application provides a fan control device based on analog signals, the fan control device comprising: an analog signal detection unit, a CPU / PWM signal processor, an anti-interference processing unit, a PWM signal amplification unit, and a fan; The output terminal of the analog signal detection unit is connected to the analog signal input pin of the CPU / PWM signal processor, the PWM signal output pin of the CPU / PWM signal processor is connected to the input terminal of the anti-interference processing unit, the output terminal of the anti-interference processing unit is connected to the control terminal of the PWM signal amplification unit, and the output terminal of the PWM signal amplification unit is connected to the power supply circuit of the fan.
[0006] In some embodiments, the analog signal detection unit includes a sampling voltage divider circuit, a filter capacitor, and a signal conditioning circuit; The output of the sampling voltage divider circuit is connected to one end of the filter capacitor, the other end of the filter capacitor is connected to the input of the signal conditioning circuit, and the output of the signal conditioning circuit is connected to the analog signal input pin of the CPU / PWM signal processor.
[0007] In some embodiments, the signal conditioning circuit includes an operational amplifier, a clamping diode, a coupling capacitor, and a feedback element; One end of the coupling capacitor is connected to the output terminal of the filter capacitor, and the other end is connected to the non-inverting input terminal of the operational amplifier. The clamping diode is connected in parallel on the signal path of the coupling capacitor. The output terminal of the operational amplifier is connected to the inverting input terminal through the feedback element. The output terminal of the operational amplifier is also connected to the analog signal input pin of the CPU / PWM signal processor through the filter output circuit.
[0008] In some embodiments, the output terminal of the sampling voltage divider circuit in the analog signal detection unit is connected to one end of the filter capacitor, the other end of the filter capacitor is connected to the non-inverting input terminal of the operational amplifier through the coupling capacitor, and the clamping diode is connected in parallel between the coupling capacitor and ground to limit the signal voltage range.
[0009] In some embodiments, the output terminal of the operational amplifier is connected to the inverting input terminal through the feedback element, and the output terminal of the operational amplifier is connected to the analog signal input pin of the CPU / PWM signal processor after passing through a filter output circuit in sequence.
[0010] In some embodiments, the CPU / PWM signal processor includes a microcontroller architecture that integrates a crystal oscillator circuit, a PWM output module, and an ADC sampling module. The crystal oscillator circuit is connected to the internal clock module of the microcontroller in the architecture, the pins of the PWM output module are connected to the input terminal of the anti-interference processing unit, and the pins of the ADC sampling module are connected to the output terminal of the analog signal detection unit.
[0011] In some embodiments, the anti-interference processing unit includes an optocoupler; The second input pin of the optocoupler is connected to the PWM signal output pin of the CPU / PWM signal processor. The first input pin of the optocoupler is connected to the power supply through a current-limiting resistor. The first output pin of the optocoupler is grounded through a pull-down resistor. The second output pin of the optocoupler is connected to the control terminal of the PWM signal amplification unit.
[0012] In some embodiments, the PWM signal amplification unit includes an NPN transistor, a PNP transistor, and a current-limiting resistor; The second output pin of the optocoupler is connected to the base of the NPN transistor. The collector of the NPN transistor is connected to the power supply through the current-limiting resistor, and the emitter is connected to the base of the PNP transistor. The emitter of the PNP transistor is connected to the power supply, and the collector of the PNP transistor is connected to the power supply circuit of the fan. The current-limiting resistor is connected in series with the fan in the power supply circuit.
[0013] In some embodiments, a filter capacitor is connected in parallel in the power supply circuit of the fan; The two ends of the filter capacitor are connected to the power supply and ground, respectively.
[0014] To achieve the above objectives, another aspect of the embodiments of this application proposes a heat dissipation device based on analog signals, the heat dissipation device including the fan control device based on analog signals as described above.
[0015] The embodiments of this application include at least the following beneficial effects: This application provides a fan control device and a heat dissipation device based on analog signals. This solution constructs a complete control link consisting of an analog signal detection unit, a CPU / PWM signal processor, an anti-interference processing unit, a PWM signal amplification unit, and a fan, achieving multi-unit collaborative linkage. First, the modular connections of each unit are clearly defined. The analog signal detection unit accurately collects the status signals of the heat dissipation system, providing a reliable basis for control. The CPU / PWM signal processor, as the core, performs signal conversion and logic operations, ensuring the accurate generation of control commands. Second, the access of the anti-interference processing unit effectively isolates the front-end digital control circuit and the back-end high-power drive circuit, significantly reducing the impact of interference signals generated by motor operation on the processor, and improving system stability and anti-interference capability. At the same time, the PWM signal amplification unit strengthens the control signal driving capability, ensuring that the fan can smoothly adjust its speed according to the command, avoiding start-stop shock. The overall circuit, through closed-loop control logic, dynamically matches the fan speed with the actual heat dissipation requirements of the system, ensuring heat dissipation efficiency to maintain stable equipment operation, avoiding energy waste, and the modular structure facilitates assembly and maintenance, improving the practicality and reliability of the device, and making it suitable for various intelligent heat dissipation scenarios. Attached Figure Description
[0016] Figure 1 This is a schematic flowchart of a wind turbine control device based on analog signals provided in an embodiment of this application; Figure 2 This is a schematic diagram of the control module structure; Figure 3 This is a schematic diagram of the structure of PWM drive and motor control; Figure 4 This is a schematic diagram of the structure for analog signal detection and conditioning. Detailed Implementation
[0017] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to limit it. In the following description, when referring to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with those of this application; they are merely examples of apparatuses and methods consistent with some aspects of the embodiments of this application as detailed in the appended claims.
[0018] It is understood that the terms “first,” “second,” etc., used in this application may be used herein to describe various concepts, but unless otherwise stated, these concepts are not limited by these terms. These terms are only used to distinguish one concept from another. For example, without departing from the scope of the embodiments of this application, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the words “if,” “when,” or “in response to a determination” as used herein may be interpreted as “when…” or “when…” or “in response to a determination.”
[0019] As used in this application, the terms "at least one", "multiple", "each", "any", etc., "at least one" includes one, two or more, "multiple" includes two or more, "each" refers to each of the corresponding multiples, and "any" refers to any one of the multiples.
[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing embodiments of this application only and is not intended to limit this application.
[0021] Before providing a detailed description of the embodiments of this application, some of the nouns and terms involved in the embodiments of this application will be explained first. The nouns and terms involved in the embodiments of this application are subject to the following interpretations.
[0022] CPU / PWM signal processor: A chip that integrates CPU and PWM generation functions. It receives analog signals, processes them, and outputs PWM signals to control the actuators (such as fans). It is the control core and has both data processing and signal output capabilities.
[0023] Clamping diode: It uses unidirectional conductivity to limit the voltage range at a certain point in the circuit to prevent overvoltage damage to subsequent components. It is often connected in parallel between the signal path and ground to provide voltage protection.
[0024] Sampling voltage divider circuit: Composed of resistors in series, it divides the voltage of external analog signals, reducing the high voltage signal to a range suitable for subsequent circuits, thus achieving safe signal acquisition.
[0025] Feedback components, such as resistors and diodes, feed back part of the output signal to the input, stabilizing circuit gain, improving linearity, and making the output more accurate.
[0026] Square wave signal: a periodic electrical signal with a level that rapidly changes between high and low states and an adjustable duty cycle. It is commonly used in digital circuits and PWM control to transmit switching or pulse information.
[0027] Figure 1 This is a flowchart illustrating a fan control device based on analog signals provided in an embodiment of this application. The fan control device includes: an analog signal detection unit, a CPU / PWM signal processor, an anti-interference processing unit, a PWM signal amplification unit, and a fan. The output of the analog signal detection unit is connected to the analog signal input pin of the CPU / PWM signal processor; the PWM signal output pin of the CPU / PWM signal processor is connected to the input of the anti-interference processing unit; the output of the anti-interference processing unit is connected to the control terminal of the PWM signal amplification unit; and the output of the PWM signal amplification unit is connected to the power supply circuit of the fan. Each unit is connected sequentially via signal lines, forming a closed-loop control link of detection, processing, anti-interference, amplification, and execution. Modular division of labor enables precise control of the fan. Analog signal detection provides the basis for control, anti-interference processing improves system stability, and PWM signal amplification ensures efficient fan response. Overall, the fan speed is dynamically matched to the heat dissipation requirements, balancing heat dissipation efficiency and energy saving.
[0028] In some embodiments, such as Figure 2 , 3 As shown in Figure 4, Figure 2 This is a schematic diagram of the control module structure; Figure 3 This is a schematic diagram of the structure of PWM drive and motor control; Figure 4 This is a schematic diagram of an analog signal detection and conditioning unit. The analog signal detection unit includes a sampling voltage divider circuit, a filter capacitor, and a signal conditioning circuit. The output of the sampling voltage divider circuit is connected to one end of the filter capacitor, and the other end of the filter capacitor is connected to the input of the signal conditioning circuit. The output of the signal conditioning circuit is connected to... Figure 2The analog signal input pins of the CPU / PWM signal processor (U1) are connected. The signal conditioning circuit includes an operational amplifier, a clamping diode, a coupling capacitor, and a feedback element. One end of the coupling capacitor is connected to the output of the filter capacitor, and the other end is connected to the non-inverting input of the operational amplifier. The clamping diode is connected in parallel in the signal path of the coupling capacitor. The output of the operational amplifier is connected to the inverting input through the feedback element. The output of the operational amplifier is also connected to the analog signal input pins of the CPU / PWM signal processor through a filter output circuit.
[0029] In the analog signal detection unit, the output of the sampling voltage divider circuit is connected to one end of a filter capacitor. The other end of the filter capacitor is connected to the non-inverting input of the operational amplifier via a coupling capacitor. A clamping diode is connected in parallel between the coupling capacitor and ground to limit the signal voltage range. The output of the operational amplifier is connected to the inverting input via a feedback element, and the output of the operational amplifier is connected to the analog signal input pin of the CPU / PWM signal processor after passing through a filter output circuit.
[0030] Specifically, the analog signal detection unit consists of Figure 4 The circuit consists of a sampling voltage divider circuit (R5, R6), a filter capacitor (EC2), and a signal conditioning circuit. The output of the sampling voltage divider circuit is connected to the filter capacitor, and the filtered signal is then connected to the signal conditioning circuit, which is finally connected to... Figure 2 The ADC pin of the CPU / PWM signal processor (U1) is located here. A voltage divider circuit enables proper sampling of the external analog signal, a filter capacitor removes high-frequency interference, and a signal conditioning circuit optimizes signal quality, providing the processor with a stable and accurate analog input and improving detection accuracy. The signal conditioning circuit includes... Figure 4 The circuit consists of an operational amplifier (IC1C), clamping diodes (D2, D3), a coupling capacitor (C3), and feedback components (R8, D4). The coupling capacitor connects the filter capacitor to the non-inverting input of the operational amplifier. The clamping diode limits the signal voltage. The operational amplifier output is connected to the processor's ADC pin via the feedback component and the filter output circuit (R7, C4). The clamping diode protects the circuit from overvoltage damage, the operational amplifier amplifies and buffers the signal, and the filter output circuit further reduces noise, ensuring a stable and reliable signal input to the processor and improving the accuracy of subsequent AD conversion.
[0031] Figure 4The output of the sampling voltage divider circuit (R5, R6) in the analog signal detection unit is connected to one end of the filter capacitor (EC2). The other end of the voltage divider circuit is connected to the non-inverting input of the operational amplifier (IC1C) via a coupling capacitor (C3). Clamping diodes (D2, D3) are connected in parallel between C3 and ground to limit the signal voltage. The output of IC1C is connected to the inverting input via feedback components (R8, D4) and then connected to the ADC1 pin of the CPU / PWM signal processor (U1) via a filter output circuit (R7, C4). The sampling voltage divider circuit achieves reasonable sampling of the external analog signal, EC2 filters out high-frequency interference, C3 isolates the DC component, the clamping diodes prevent overvoltage damage to the device, IC1C amplifies and buffers the signal through negative feedback, and R7 and C4 further reduce noise. Overall, this improves the stability and accuracy of the analog signal, provides a reliable input to the processor, ensures the precision of the fan control, and enhances the circuit's anti-interference capability and safety.
[0032] In some embodiments, the CPU / PWM signal processor includes a microcontroller architecture that integrates a crystal oscillator circuit, a PWM output module, and an ADC sampling module. The crystal oscillator circuit is connected to the internal clock module of the microcontroller architecture, the pins of the PWM output module are connected to the input terminal of the anti-interference processing unit, and the pins of the ADC sampling module are connected to the output terminal of the analog signal detection unit.
[0033] like Figure 2 As shown, the CPU / PWM signal processor (U1) is a microcontroller that integrates a crystal oscillator circuit (X1, C1, C2), a PWM output module, and an ADC sampling module. The crystal oscillator circuit provides the clock signal. Figure 2 Pins P1.1 / ADC1 / 21 of U1 and Figure 4 The circuit connections in the diagram. Pin P3.7 / PWM0 / 19 of U1 is connected to... Figure 3 The integrated design simplifies the circuit structure, the crystal oscillator ensures stable processor operation, the PWM module accurately generates control signals, and the ADC module digitizes analog signals, providing core computing and instruction generation capabilities for wind turbine control.
[0034] In some embodiments, the anti-interference processing unit includes an optocoupler; the second input pin of the optocoupler is connected to the PWM signal output pin of the CPU / PWM signal processor, the first input pin of the optocoupler is connected to the power supply through a current-limiting resistor, the first output pin of the optocoupler is grounded through a pull-down resistor, and the second output pin of the optocoupler is connected to the control terminal of the PWM signal amplification unit.
[0035] The PWM signal amplification unit includes an NPN transistor, a PNP transistor, and a current-limiting resistor. The second output pin of the optocoupler is connected to the base of the NPN transistor. The collector of the NPN transistor is connected to the power supply through the current-limiting resistor, and the emitter is connected to the base of the PNP transistor. The emitter of the PNP transistor is connected to the power supply, and the collector of the PNP transistor is connected to the power supply circuit of the fan. The current-limiting resistor is connected in series with the fan in the power supply circuit. A filter capacitor is connected in parallel to the fan's power supply circuit; the two ends of the filter capacitor are connected to the power supply and ground, respectively.
[0036] Specifically, Figure 3 The anti-interference processing unit uses an optocoupler (U2) and external resistors (R3, R4). The second input pin of the optocoupler is connected to the processor's PWM output, the first input pin is connected to the power supply via R3, the first output pin is grounded via R4, and the second output pin is connected to the PWM amplifier unit. Electrical isolation is achieved through the optocoupler, preventing interference from the motor's high-voltage circuits. R3 limits the input current to protect the optocoupler, and R4 ensures stable output levels, significantly improving the system's anti-interference capability and safety.
[0037] The PWM signal amplification unit is a push-pull drive circuit, consisting of an NPN transistor (Q1), a PNP transistor (Q2), and current-limiting resistors (R1, R2). The optocoupler output is connected to the base of Q1, the collector of Q1 is connected to the power supply via R1, and the emitter is connected to the base of Q2. The collector of Q2 is connected in series with the fan via R2 and then connected to the power supply circuit. The push-pull circuit enhances the PWM signal driving capability, while R1 and R2 limit the current to protect the transistors and the fan, achieving efficient regulation of the fan speed and avoiding control lag caused by insufficient signal drive.
[0038] A filter capacitor (EC1) is connected in parallel in the power supply circuit of the fan (M1), with its two ends connected to the power supply and ground respectively. EC1 filters out ripple and noise in the power supply voltage, stabilizes the fan's operating voltage, reduces the impact of voltage fluctuations on the fan speed, reduces operating noise, and extends the fan's service life.
[0039] In some embodiments, such as Figure 2 , Figure 3 and Figure 4 As shown, the analog signal detection unit consists of an operational amplifier, a voltage doubler rectifier circuit, and their auxiliary components. It is connected to the CPU / PWM signal processor (U1). The PWM signal is normally in a static state, and the fan is not operating. When... Figure 4 When there is an analog or AC signal at the CS1 terminal, the analog AC signal is converted into a DC signal by an operational amplifier and a voltage doubler rectifier circuit, and then input to the CPU / PWM signal processor.
[0040] like Figure 2Pins P1.1 / ADC1 / 21 of U1 and P3.7 / PWM0 / 19 of the CPU / PWM signal processor are connected to pin 2 of the optocoupler. After receiving an analog electrical signal, U1 activates the PWM signal, thus starting the fan and achieving energy saving. The anti-interference processing unit consists of… Figure 3 The system consists of an optocoupler U2 (TLP521). To avoid unpredictable interference, the anti-interference processing unit employs opto-isolation technology. The optocoupler has a very low input impedance, while the interference source has a relatively high impedance. Even if the interference source voltage amplitude is large, the noise voltage delivered to the optocoupler input will be very small, resulting in a very weak current, insufficient to make the diode emit light, thus suppressing the interference source. This provides excellent protection for the PWM signal.
[0041] The working principle of an optocoupler: When the PWM control signal from the CPU / PWM signal processor U1 is input to the input terminal of the optocoupler, current flows through the optocoupler's light-emitting diode (LED) and it emits light. The photosensitive element, when illuminated, generates current, and the collector-emitter junction (CE) conducts. When the CPU / PWM signal processor U1 stops sending control signals, the LED does not light up, the phototransistor is cut off, and the CE junction is not connected. For digital signals, when the input is low ("0"), the phototransistor is cut off, and the output is high ("1"); when the input is high ("1"), the phototransistor is saturated and conducts, and the output is low ("0"). The PWM signal passes through an opto-isolated device, and then... Figure 3 The circuit composed of Q1 and Q2 is amplified to drive the fan.
[0042] A PWM signal is a square wave signal whose high and low levels can vary in duration, but the total period is fixed. By adjusting the pulse width and modulating the duty cycle of the PWM signal, the voltage across the fan is linearly controlled. When the duty cycle increases, the average voltage across the fan also increases, thus increasing the fan's rotational speed. Conversely, when the PWM duty cycle decreases, the average voltage across the fan also decreases, and the fan's rotational speed decreases. The fan's response to voltage changes is linear; that is, the higher the voltage, the faster the rotational speed. Therefore, by precisely controlling the PWM signal's duty cycle, the fan's rotational speed can be precisely controlled. PWM signal control not only precisely controls the fan's rotational speed but is also more energy-efficient than traditional voltage control methods because the fan's power consumption is significantly reduced at low duty cycles, achieving the goal of power saving.
[0043] To achieve the above objectives, embodiments of this application also provide a heat dissipation device based on analog signals, which includes the fan control device based on analog signals as described above.
[0044] The embodiments described in this application are for the purpose of more clearly illustrating the technical solutions of the embodiments of this application, and do not constitute a limitation on the technical solutions provided by the embodiments of this application. As those skilled in the art will know, with the evolution of technology and the emergence of new application scenarios, the technical solutions provided by the embodiments of this application are also applicable to similar technical problems.
[0045] Those skilled in the art will understand that the technical solutions shown in the figures do not constitute a limitation on the embodiments of this application, and may include more or fewer steps than shown, or combine certain steps, or different steps.
[0046] Those skilled in the art will understand that all or some of the steps in the methods disclosed above, as well as the functional modules / units in the systems and devices, can be implemented as software, firmware, hardware, or suitable combinations thereof.
[0047] It should be understood that the data used in this way can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in a sequence other than those illustrated or described herein. Furthermore, the terms “comprising” and “having”, and any variations thereof, are intended to cover a non-exclusive inclusion, for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such process, method, product, or apparatus.
[0048] It should be understood that in this application, "at least one (item)" means one or more, and "more than" means two or more. "And / or" is used to describe the relationship between related objects, indicating that three relationships can exist. For example, "A and / or B" can represent three cases: only A exists, only B exists, and both A and B exist simultaneously, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one (item) of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one (item) of a, b, or c can represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, and c can be single or multiple.
[0049] In the several embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of the units described above is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.
[0050] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.
[0051] The preferred embodiments of the present application have been described above with reference to the accompanying drawings, but this does not limit the scope of the claims of the present application. Any modifications, equivalent substitutions, and improvements made by those skilled in the art without departing from the scope and substance of the embodiments of the present application shall be within the scope of the claims of the present application.
Claims
1. A fan control device based on analog signals, characterized in that, The fan control device includes: an analog signal detection unit, a CPU / PWM signal processor, an anti-interference processing unit, a PWM signal amplification unit, and a fan; The output terminal of the analog signal detection unit is connected to the analog signal input pin of the CPU / PWM signal processor, the PWM signal output pin of the CPU / PWM signal processor is connected to the input terminal of the anti-interference processing unit, the output terminal of the anti-interference processing unit is connected to the control terminal of the PWM signal amplification unit, and the output terminal of the PWM signal amplification unit is connected to the power supply circuit of the fan.
2. The fan control device based on analog signals according to claim 1, characterized in that, The analog signal detection unit includes a sampling voltage divider circuit, a filter capacitor, and a signal conditioning circuit; The output of the sampling voltage divider circuit is connected to one end of the filter capacitor, the other end of the filter capacitor is connected to the input of the signal conditioning circuit, and the output of the signal conditioning circuit is connected to the analog signal input pin of the CPU / PWM signal processor.
3. The fan control device based on analog signals according to claim 2, characterized in that, The signal conditioning circuit includes an operational amplifier, a clamping diode, a coupling capacitor, and a feedback element; One end of the coupling capacitor is connected to the output terminal of the filter capacitor, and the other end is connected to the non-inverting input terminal of the operational amplifier. The clamping diode is connected in parallel on the signal path of the coupling capacitor. The output terminal of the operational amplifier is connected to the inverting input terminal through the feedback element. The output terminal of the operational amplifier is also connected to the analog signal input pin of the CPU / PWM signal processor through the filter output circuit.
4. The wind turbine control device based on analog signals according to claim 3, characterized in that, The output of the sampling voltage divider circuit in the analog signal detection unit is connected to one end of the filter capacitor, and the other end of the filter capacitor is connected to the non-inverting input of the operational amplifier through the coupling capacitor. The clamping diode is connected in parallel between the coupling capacitor and ground to limit the signal voltage range.
5. The wind turbine control device based on analog signals according to claim 4, characterized in that, The output terminal of the operational amplifier is connected to the inverting input terminal through the feedback element, and the output terminal of the operational amplifier is connected to the analog signal input pin of the CPU / PWM signal processor after passing through the filter output circuit in sequence.
6. The wind turbine control device based on analog signals according to claim 1, characterized in that, The CPU / PWM signal processor includes a microcontroller architecture, which integrates a crystal oscillator circuit, a PWM output module, and an ADC sampling module. The crystal oscillator circuit is connected to the internal clock module of the microcontroller in the architecture, the pins of the PWM output module are connected to the input terminal of the anti-interference processing unit, and the pins of the ADC sampling module are connected to the output terminal of the analog signal detection unit.
7. The wind turbine control device based on analog signals according to claim 1, characterized in that, The anti-interference processing unit includes an optocoupler; The second input pin of the optocoupler is connected to the PWM signal output pin of the CPU / PWM signal processor. The first input pin of the optocoupler is connected to the power supply through a current-limiting resistor. The first output pin of the optocoupler is grounded through a pull-down resistor. The second output pin of the optocoupler is connected to the control terminal of the PWM signal amplification unit.
8. The wind turbine control device based on analog signals according to claim 7, characterized in that, The PWM signal amplification unit includes an NPN transistor, a PNP transistor, and a current-limiting resistor; The second output pin of the optocoupler is connected to the base of the NPN transistor. The collector of the NPN transistor is connected to the power supply through the current-limiting resistor, and the emitter is connected to the base of the PNP transistor. The emitter of the PNP transistor is connected to the power supply, and the collector of the PNP transistor is connected to the power supply circuit of the fan. The current-limiting resistor is connected in series with the fan in the power supply circuit.
9. The wind turbine control device based on analog signals according to claim 8, characterized in that, The power supply circuit of the fan is connected in parallel with a filter capacitor; The two ends of the filter capacitor are connected to the power supply and ground, respectively.
10. A heat dissipation device based on analog signals, characterized in that, The heat dissipation device includes a fan control device based on analog signals as described in any one of claims 1-9.