CN215927870U - Novel vehicle-mounted multimedia cooling fan control circuit - Google Patents
Novel vehicle-mounted multimedia cooling fan control circuit Download PDFInfo
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- CN215927870U CN215927870U CN202122375732.7U CN202122375732U CN215927870U CN 215927870 U CN215927870 U CN 215927870U CN 202122375732 U CN202122375732 U CN 202122375732U CN 215927870 U CN215927870 U CN 215927870U
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Abstract
The utility model discloses a novel vehicle-mounted multimedia cooling fan control circuit which comprises a current limiting circuit, an output voltage circuit, a control circuit, a hardware overvoltage protection circuit, an AD detection circuit and a filter circuit. The utility model provides a novel vehicle-mounted multimedia cooling fan control circuit, which uses a fan for cooling, avoids using large-area cooling fins, reduces the volume and the weight of a vehicle-mounted central control, adjusts different fan rotating speeds according to different external environments, and can furthest ensure the service life of the fan.
Description
Technical Field
The utility model relates to a fan control circuit, in particular to a novel vehicle-mounted multimedia cooling fan control circuit.
Background
The vehicle-mounted multimedia system is widely installed in various automobiles, along with the development of electronic technology, the SOC processing capability of the vehicle-mounted multimedia system is stronger and stronger, the functions capable of being supported are more and more, and the SOC power consumption is higher and higher. The main heating element of on-vehicle multimedia is changed from power amplifier before into present power amplifier and adds SOC, and SOC's consumption increases, and the use quantity and the output synchronous increase of power chip, the heat that the host computer produced further increase, and the installation space of multimedia in the car is narrow and small relatively simultaneously, and on-vehicle electron heat dissipation handles more and more important.
The traditional method for processing heat dissipation is structurally that a large heat dissipation fin is arranged on a vehicle-mounted multimedia, the heat dissipation effect of a central control host can be improved by the large heat dissipation fin, but the heat dissipation fin is limited by the problems of size and weight and cannot be increased without limit, and meanwhile, the cost of the central control host can be greatly increased by the overlarge heat dissipation fin.
The volume of a vehicle-mounted multimedia host is generally required by a vehicle factory, meanwhile, the functions of a central control host are more, a hardware PCBA needs to occupy a large amount of space, the host is determined to be incapable of increasing the volume and the area of a radiating fin only by referring to other electronic products, so that a radiating fan is added in the host, the radiating problem of the product is solved by introducing the fan, a new problem is brought, and how to handle the open short circuit problem of a fan circuit is solved; how the hardware realizes the software speed regulation ensures the service life of the fan; the fan is a motor system, and how to eliminate the EMC interference problem of a fan circuit; how to control the state of the fan in real time ensures that the power supply of the fan is turned off under special conditions, and the danger is avoided.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects of the prior art and provide a novel vehicle-mounted multimedia cooling fan control circuit, wherein a fan is used for cooling, so that a large-area cooling fin is avoided, the volume and the weight of a vehicle-mounted central control are reduced, different fan rotating speeds are adjusted according to different external environments, and the service life of the fan can be ensured to the greatest extent.
The purpose of the utility model is realized as follows: a novel vehicle-mounted multimedia cooling fan control circuit comprises a current limiting circuit, an output voltage circuit, a control circuit, a hardware overvoltage protection circuit, an AD detection circuit and an MCU micro control unit;
the current limiting circuit is used for feeding back a control signal for controlling the power supply output circuit when the current in the circuit reaches a threshold value, and limiting the output of the output voltage circuit;
the input end of the output voltage circuit is connected with the output end of the control circuit and is used for receiving a control circuit signal, adjusting the power supply voltage of the fan and controlling the rotating speed of the fan;
the input end of the control circuit is connected with the output end of the MCU micro control unit and is used for processing the PWM signal output by the MCU micro control unit and receiving a feedback signal of the hardware overvoltage protection circuit;
the input end of the hardware overvoltage protection circuit is connected with the output end of the output voltage circuit and used for monitoring the voltage of the output circuit, and the voltage is fed back to the control circuit after reaching a threshold;
the AD detection circuit is used for converting a voltage signal at the rear end and inputting the voltage signal to the MCU;
the filter circuit is used for filtering voltage fluctuation caused by rotation of the fan motor.
When the fan power supply circuit works, the battery voltage is directly obtained by the fan power supply, the battery voltage passes through the current limiting circuit, the output of the output voltage circuit is limited when the current in the circuit reaches a threshold value, and the output voltage circuit receives a control circuit signal, adjusts the power supply voltage of the fan and controls the rotating speed of the fan; the control circuit processes the PWM signal output by the MCU micro control unit, realizes the control of the fan rotating speed in a duty ratio mode, and simultaneously receives a feedback signal of the hardware overvoltage protection circuit to ensure that the output voltage is in the safe working voltage range of the fan; the hardware overvoltage protection circuit monitors the voltage of the output circuit, and the voltage is fed back to the control circuit after reaching a threshold; the AD detection circuit converts the voltage signal at the rear end and inputs the voltage signal into the MCU, so that the MCU regulates the speed of the fan according to the requirement of the external situation; the filter circuit is connected with a large capacitor at the port of the fan for supplying power to filter out voltage fluctuation caused by the rotation of the fan motor.
By adopting the technical scheme, compared with the prior art, the utility model has the beneficial effects that: the vehicle-mounted multimedia system is cooled by the fan, so that large-area cooling fins are avoided, the size and the weight of a vehicle-mounted central control are reduced, the current and voltage limiting is realized by a fan control strategy through a hardware strategy, the speed regulation is realized through the MCU, different fan rotating speeds are regulated according to different external environments, and the service life of the fan can be guaranteed to the greatest extent.
In order to enable the wind speed of the fan to change along with the change of external regulation, the wind speed regulation device further comprises an MCU (micro control unit) which is used for regulating the speed of the fan, outputting a PWM (pulse width modulation) signal with a specific duty ratio according to the requirement of the external condition and regulating the speed of the fan.
Further, the output voltage circuit adopts a transistor Q1 as a control voltage output device.
Furthermore, the control circuit comprises a resistor R6, a capacitor C2 and a triode Q3, wherein one end of the resistor R6 is connected with the PWM signal input end, the other end of the resistor R6 is connected with the base electrode of the triode Q3, and the emitter electrode of the triode Q3 is grounded through a resistor R8.
In order to achieve the purpose of a current-limiting protection circuit, the current-limiting protection circuit comprises a resistor R1, a resistor R2, a resistor R4 and a triode Q2, wherein one end of the resistor R1 is connected with a battery voltage VBAT and an emitter of the triode Q2, the other end of the resistor R1 is connected with the emitter of the triode Q1 after being connected in series through a resistor R2, and a base of the triode Q2 is connected with the emitter of the triode Q1 through a resistor R4.
In order to play a role of overvoltage protection, the hardware overvoltage protection circuit comprises a resistor R9, a resistor R10, a resistor R11, a resistor R12 and a transistor Q4, wherein the transistor Q4 and the transistor Q3 share an emitter, the base of the transistor Q4 is connected among the resistor R9, the resistor R10, the resistor R11 and the resistor R12, and the other end of the resistor R12 is grounded.
Furthermore, the AD detection circuit comprises a resistor R13, a resistor R14 and a resistor R15, wherein one end of the resistor R13 is connected with the collector of the triode Q1, and the other end of the resistor R13 is connected with an AD detection port of the MCU micro control unit through a resistor R14; one end of the resistor R15 is connected with the collector of the triode Q1, and the other end is connected with the AD detection port of the MCU micro control unit through the resistor R14.
Drawings
FIG. 1 is a schematic circuit diagram of the present invention.
Fig. 2 is a schematic circuit diagram of the present invention.
Detailed Description
As shown in fig. 1, the novel vehicle-mounted multimedia cooling fan control circuit includes a current limiting circuit, an output voltage circuit, a control circuit, a hardware overvoltage protection circuit, an AD detection circuit, and a filter circuit;
the current limiting circuit is used for feeding back a control signal for controlling the power supply output circuit when the current in the circuit reaches a threshold value, limiting the output of the output voltage circuit and playing a role in overcurrent protection;
the input end of the output voltage circuit is connected with the output end of the control circuit, receives the control circuit signal, adjusts the size of the power supply voltage of the fan and controls the rotating speed of the fan;
the input end of the control circuit is connected with the output end of the MCU micro control unit and is used for processing the PWM signal output by the MCU micro control unit, so that the rotating speed of the fan is controlled in a duty ratio mode, and meanwhile, the feedback signal of the hardware overvoltage protection circuit is received, so that the output voltage is ensured to be within the safe working voltage range of the fan;
the input end of the hardware overvoltage protection circuit is connected with the output end of the output voltage circuit and is used for monitoring the voltage of the output circuit, and the voltage is fed back to the control circuit after reaching a threshold;
the AD detection circuit is used for converting the voltage signal at the rear end and inputting the voltage signal to the MCU;
the filter circuit is used for filtering voltage fluctuation caused by rotation of a fan motor, the fan comprises the motor, conduction interference can be generated during working, and the filter circuit prevents the fan motor from polluting a front-end power supply.
The MCU is used for regulating the speed of the fan, and outputting a PWM signal with a specific duty ratio according to the requirement of external conditions to regulate the speed of the fan; because the battery voltage is unstable voltage, the AD port is required to be used for detecting the input voltage of the fan at the same time, and the duty ratio is further adjusted according to the feedback voltage, so that the wind speed is changed along with the change of external adjustment.
As shown in fig. 2, the current limiting circuit includes a resistor R1, a resistor R2, a resistor R4, and a transistor Q2, wherein one end of the resistor R1 is connected to the battery voltage VBAT and the emitter of the transistor Q2, the other end of the resistor R2 is connected in series and then connected to the emitter of the transistor Q1, and the base of the transistor Q2 is connected to the emitter of the transistor Q1 through a resistor R4. When the current in the circuit is large, the resistor R1 and the resistor R2 generate voltage drop, when the sum of the voltage drops of the resistor R1 and the resistor R2 reaches the conduction voltage of the triode Q2, the triode Q2 is conducted, the power supply voltage reaches the base electrode of the triode Q1, the conduction of the triode Q1 is restrained, the current-limiting purpose is achieved, and the circuit is protected.
The control circuit comprises a resistor R6, a capacitor C2 and a triode Q3, wherein one end of the resistor R6 is connected with the PWM signal input end, the other end of the resistor R6 is connected with the base electrode of the triode Q3, and the emitter electrode of the triode Q3 is grounded through a resistor R8. FS-CTL is the PWM signal that MCU micro control unit exported, PWM signal forms direct current voltage after resistance R6 and electric capacity C2 filtration, the duty cycle of PWM wave influences the direct current voltage after the filtration, the higher the duty cycle, direct current voltage is higher, triode Q3 base voltage is different to correspond to the conduction depth of triode Q3 different, the conduction situation of triode Q3 directly influences the base of power triode Q1, the conduction depth of triode Q1 is controlled directly, reach the purpose of controlling triode Q1 output voltage, in conclusion triode Q1's output voltage changes along with the duty cycle change of PWM.
The output voltage circuit adopts a triode Q1 as a control voltage output device, a high-power triode Q1 as a control voltage output device, a triode Q1 works in an amplification region, the conduction depth of the triode Q1 directly influences the output voltage at the rear end, the current flowing through the base electrode of the triode Q1 is controlled, and the output voltage can be controlled; meanwhile, the output voltage of the transistor Q1 directly influences the rotating speed of the fan.
The hardware overvoltage protection circuit comprises a resistor R9, a resistor R10, a resistor R11, a resistor R12 and a triode Q4, wherein the triode Q4 and the triode Q3 are in common emitter, the base electrode of the triode Q4 is connected among the resistor R9, the resistor R10, the resistor R11 and the resistor R12, and the other end of the resistor R12 is grounded. When the voltage output voltage of the triode Q1 is too high, the voltage is divided by four resistors, namely a resistor R9, a resistor R10, a resistor R11 and a resistor R12, when the voltage divided by the resistor R12 reaches the conduction requirement of the triode Q4, the triode Q4 is conducted, the triode Q4 and the triode Q3 share an emitter, the conduction of the triode Q4 can inhibit the conduction of the triode Q3, and finally, balance is formed, so that the output voltage of the triode Q1 can not exceed a threshold value, and an overvoltage protection effect is achieved.
The AD detection circuit comprises a resistor R13, a resistor R14 and a resistor R15, wherein one end of the resistor R13 is connected with a collector of a triode Q1, and the other end of the resistor R13 is connected with an AD detection port of the MCU through a resistor R14; one end of the resistor R15 is connected with the collector of the triode Q1, and the other end is connected with the AD detection port of the MCU through the resistor R14; triode Q1's output voltage is higher, surpasss MCU microcontrol unit's volume production, uses resistance R13 and resistance R15 partial pressure, and the voltage after the partial pressure is received on microcontrol unit MCU's AD test port, and MCU microcontrol unit can real-time supervision fan's output voltage like this, to some emergency, can realize control through software.
The filter circuit is mainly formed by connecting a capacitor C4, a capacitor C5, a capacitor C6 and a capacitor EC1 in parallel, a motor is arranged in the fan, the low-frequency interference of parameters can be reversely transmitted to a power supply when the motor works, and a large capacitor is connected to a port for supplying power to the fan to filter voltage fluctuation caused by rotation of the fan motor.
When the fan power supply circuit works, the battery voltage is directly obtained by the fan power supply, the battery voltage passes through the current limiting circuit, the output of the output voltage circuit is limited when the current in the circuit reaches a threshold value, and the output voltage circuit receives a control circuit signal, adjusts the power supply voltage of the fan and controls the rotating speed of the fan; the control circuit processes the PWM signal output by the MCU micro control unit, realizes the control of the fan rotating speed in a duty ratio mode, and simultaneously receives a feedback signal of the hardware overvoltage protection circuit to ensure that the output voltage is in the safe working voltage range of the fan; the hardware overvoltage protection circuit monitors the voltage of the output circuit, and the voltage is fed back to the control circuit after reaching a threshold; the AD detection circuit converts the voltage signal at the rear end and inputs the voltage signal into the MCU, so that the MCU regulates the speed of the fan according to the requirement of the external situation; the filter circuit is connected with a large capacitor at the port of the fan for supplying power to filter out voltage fluctuation caused by the rotation of the fan motor.
The present invention is not limited to the above-mentioned embodiments, and based on the technical solutions disclosed in the present invention, those skilled in the art can make some substitutions and modifications to some technical features without creative efforts according to the disclosed technical contents, and these substitutions and modifications are all within the protection scope of the present invention.
Claims (7)
1. A novel vehicle-mounted multimedia cooling fan control circuit is characterized by comprising a current limiting circuit, an output voltage circuit, a control circuit, a hardware overvoltage protection circuit, an AD detection circuit and a filter circuit;
the current limiting circuit is used for feeding back a control signal for controlling the power supply output circuit when the current in the circuit reaches a threshold value, and limiting the output of the output voltage circuit;
the input end of the output voltage circuit is connected with the output end of the control circuit and is used for receiving a control circuit signal, adjusting the power supply voltage of the fan and controlling the rotating speed of the fan;
the input end of the control circuit is connected with the output end of the MCU micro control unit and is used for processing the PWM signal output by the MCU micro control unit and receiving a feedback signal of the hardware overvoltage protection circuit;
the input end of the hardware overvoltage protection circuit is connected with the output end of the output voltage circuit and used for monitoring the voltage of the output circuit, and the voltage is fed back to the control circuit after reaching a threshold;
the AD detection circuit is used for converting a voltage signal at the rear end and inputting the voltage signal to the MCU;
the filter circuit is used for filtering voltage fluctuation caused by rotation of the fan motor.
2. The novel vehicle-mounted multimedia cooling fan control circuit according to claim 1, further comprising an MCU (micro control unit) for fan speed regulation, wherein the MCU is used for outputting a PWM (pulse width modulation) signal with a specific duty ratio according to the requirement of an external situation to regulate the fan speed.
3. The novel vehicle-mounted multimedia cooling fan control circuit according to claim 1, wherein the output voltage circuit adopts a triode Q1 as a control voltage output device.
4. The novel vehicle-mounted multimedia cooling fan control circuit according to claim 1, wherein the control circuit comprises a resistor R6, a capacitor C2 and a transistor Q3, one end of the resistor R6 is connected to the PWM signal input terminal, the other end of the resistor R6 is connected to the base of the transistor Q3, and the emitter of the transistor Q3 is grounded via a resistor R8.
5. The novel vehicle-mounted multimedia cooling fan control circuit according to claim 3, wherein the current limiting circuit comprises a resistor R1, a resistor R2, a resistor R4 and a transistor Q2, one end of the resistor R1 is connected with the battery voltage VBAT and the emitter of the transistor Q2, the other end of the resistor R1 is connected with the emitter of the transistor Q1 after being connected in series through a resistor R2, and the base of the transistor Q2 is connected with the emitter of the transistor Q1 through a resistor R4.
6. The novel vehicle-mounted multimedia cooling fan control circuit according to claim 3, wherein the hardware overvoltage protection circuit comprises a resistor R9, a resistor R10, a resistor R11, a resistor R12 and a transistor Q4, the transistor Q4 and the transistor Q3 share an emitter, a base of the transistor Q4 is connected among the resistor R9, the resistor R10, the resistor R11 and the resistor R12, and the other end of the resistor R12 is grounded.
7. The novel vehicle-mounted multimedia cooling fan control circuit according to claim 3, wherein the AD detection circuit comprises a resistor R13, a resistor R14 and a resistor R15, one end of the resistor R13 is connected with a collector of a transistor Q1, and the other end of the resistor R13 is connected with an AD detection port of the MCU micro control unit through a resistor R14; one end of the resistor R15 is connected with the collector of the triode Q1, and the other end is connected with the AD detection port of the MCU micro control unit through the resistor R14.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202122375732.7U CN215927870U (en) | 2021-09-29 | 2021-09-29 | Novel vehicle-mounted multimedia cooling fan control circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122375732.7U CN215927870U (en) | 2021-09-29 | 2021-09-29 | Novel vehicle-mounted multimedia cooling fan control circuit |
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| CN215927870U true CN215927870U (en) | 2022-03-01 |
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| CN202122375732.7U Active CN215927870U (en) | 2021-09-29 | 2021-09-29 | Novel vehicle-mounted multimedia cooling fan control circuit |
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