CN210769463U - Power supply control circuit of fan - Google Patents
Power supply control circuit of fan Download PDFInfo
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- CN210769463U CN210769463U CN201921428055.7U CN201921428055U CN210769463U CN 210769463 U CN210769463 U CN 210769463U CN 201921428055 U CN201921428055 U CN 201921428055U CN 210769463 U CN210769463 U CN 210769463U
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Abstract
The utility model provides a power supply control circuit of a fan, which comprises a temperature acquisition and processing module, a signal processing module and a power supply control module; the temperature acquisition and processing module is used for monitoring the temperature of the measured point and converting a temperature signal into a voltage signal and outputting the voltage signal to the signal processing module; the signal processing module is used for processing the voltage signal output by the temperature acquisition and processing module, setting a voltage value corresponding to the temperature point at which the fan starts to rotate, and outputting a proper voltage signal after comparing the two voltage values; the power supply control module is used for receiving the voltage signal output by the signal processing module, determining the power supply voltage of the fan and controlling the rotating speed of the fan. The utility model discloses a height of monitoring temperature amplifies and compares the signal of temperature, carries out reasonable parameter design after that, and the supply voltage of the last definite fan, the slew velocity of control fan make the control to the fan more reasonable and reliable.
Description
Technical Field
The utility model relates to a power field especially relates to the power supply control circuit of fan in the power.
Background
Nowadays, the demand for power of power supply is getting larger and larger, and correspondingly, the requirement for heat dissipation of power supply is also getting higher and higher. The switching power supply with medium and high power generally radiates heat through the rotation of a fan, and the control on the fan at present generally falls into two categories:
the first broad category is divided into two embodiments: 1. the fan rotates when the temperature is higher than the threshold value and rotates at full speed, and the fan does not rotate when the temperature is lower than the threshold value; 2. the fan is controlled to rotate as soon as the power supply is started.
These control methods have a large loss of electric energy and do not effectively and fully utilize the electric energy; in addition, when the internal temperature of the product is not high or just exceeds a set temperature threshold, the fan rotates at full speed to dissipate heat, the working efficiency of the product and the service life of the fan are affected.
There are also two embodiments in the second main category:
1. the temperature is detected by analog-to-digital conversion of the microprocessor and then a PWM control signal is output to control the fan off or speed or supply voltage. The implementation mode needs a single chip microcomputer or a digital control chip to realize control, and the performance of the single chip microcomputer is easily affected by high temperature, so that the reliability is deteriorated; meanwhile, software programming is also needed to realize processing functions, and program bugs can cause failure risks. In addition, the mode is complex to control and high in cost;
2. the temperature is sensed through the resistance value change of the thermistor, and the power supply voltage of the fan is adjusted at the same time, so that the purpose of controlling the fan is achieved. But this mode is slow.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem of above-mentioned fan control, the utility model provides a fan power supply control circuit need not the singlechip and handles and control, and the supply voltage of fan is controlled to the inside temperature of accessible monitoring product to control fan rotational speed realizes that the rotational speed of fan changes along with the change of the inside temperature of product. The purpose of the utility model is realized through the following technical scheme:
a power supply control circuit of a fan comprises a temperature acquisition and processing module, a signal processing module and a power supply control module;
the input end of the temperature acquisition and processing module is used as the input end of a power supply control circuit of the fan and is connected with an input voltage VIN; the output end of the power supply control module is used as the output end of a power supply control circuit of the fan and is connected with the input end of the fan; the power supply end of the signal processing module and the power supply end of the power supply control module are connected with an input voltage VIN; the output end of the temperature acquisition and processing module is connected with the input end of the signal processing module; the output end of the signal processing module is connected with the input end of the power supply control module; the ground ends of the temperature acquisition and processing module, the signal processing module and the power supply control module are all connected with a reference ground;
the temperature acquisition and processing module is used for monitoring the temperature of the measured point and converting a temperature signal into a voltage signal and outputting the voltage signal to the signal processing module; the signal processing module is used for processing the voltage signal output by the temperature acquisition and processing module, setting a voltage value corresponding to the temperature point at which the fan starts to rotate, and outputting a proper voltage signal after comparing the two voltage values; the power supply control module is used for receiving the voltage signal output by the signal processing module, determining the power supply voltage of the fan and controlling the rotating speed of the fan.
As a specific implementation mode of the temperature acquisition and processing module, the temperature acquisition and processing module is characterized in that: comprising a thermistor RntcA resistor R1; thermistor RntcOne end of the voltage-stabilizing circuit is connected with an input voltage VIN as an input end of the temperature acquisition and processing module; thermistor RntcThe other end of the resistor is connected with one end of a resistor R1, and the connection point of the resistor R1 is used as the output end of the temperature acquisition and processing module; the other end of the resistor R1 is connected with the ground end of the temperature acquisition and processing module.
As another specific implementation mode of the temperature acquisition and processing module, the temperature acquisition and processing module is characterized in that: comprising a thermistor RntcA resistor R1, an operational amplifier U1A; thermistor RntcOne end of the voltage-stabilizing circuit is connected with an input voltage VIN as an input end of the temperature acquisition and processing module; thermistor RntcThe other end of the resistor is connected with one end of a resistor R1, and the connection point of the resistor R1 is connected with the non-inverting input end of an operational amplifier U1A; the output end of the operational amplifier U1A is connected with the negative phase input end of the operational amplifier U1A, and the connection point of the operational amplifier U1A is used as a temperature acquisition and processing moduleAn output terminal of (a); the other end of the resistor R1 is connected with the ground end of the temperature acquisition and processing module.
Preferably, the thermistor RntcIs a negative temperature coefficient thermistor.
As a specific implementation manner of the signal processing module, the method is characterized in that: the circuit comprises a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R10, an operational amplifier U1B, an operational amplifier U1C, a MOS tube Q1 and a diode D1; one end of the resistor R2 is connected with one end of the resistor R3, and the connection point of the resistor R2 is used as the input end of the signal processing module; the other end of the resistor R2 is connected with the non-inverting input end of the operational amplifier U1B; the negative phase input end of the operational amplifier U1B is connected with one end of the resistor R4 and one end of the resistor R5; the other end of the resistor R5 and one end of the resistor R6 are connected with the output end of the operational amplifier U1B; the other end of the resistor R6 is connected with the drain electrode of the MOS transistor Q1, and the connection point of the resistor R6 is used as the output end of the signal processing module; the other end of the resistor R3 is connected with the negative phase input end of the operational amplifier U1C; one end of the resistor R10 and one end of the resistor R7 are connected with an input voltage VIN; the other end of the resistor R7, one end of the resistor R8 and one end of the resistor R9 are connected with the non-inverting input end of the operational amplifier U1C; the other end of the resistor R9 is connected with the anode of the diode D1; the cathode of the diode D1, the other end of the resistor R10 and the gate of the MOS transistor Q1 are connected with the output end of the operational amplifier U1C; the other end of the resistor R4, the other end of the resistor R8 and the source of the MOS transistor Q1 are connected with the ground end of the signal processing module.
Another specific implementation of the signal processing module is characterized in that: unlike the above embodiments, the reference voltage Verf is connected to one end of the resistor R7, and the input voltage VIN is connected to one end of the resistor R10.
As a specific embodiment of the power supply control module, the method is characterized in that: the circuit comprises a triode Q2, a triode Q3, a triode Q4, a resistor R11 and a capacitor C1; the base electrode of the triode Q2 is used as the input end of the power supply control module; one end of the resistor R11 is connected with the emitter of the triode Q4, and the connection point of the resistor R11 is used as the power supply end of the power supply control module; the other end of the resistor R11 is connected with an emitter of the triode Q2 and a base of the triode Q3; the collector of the triode Q3 is connected with the base of the triode Q4; the emitter of the triode Q3 is connected with the collector of the triode Q4 and one end of the capacitor C1, and the connection point of the triode Q3 is used as the output end of the power supply control module; the collector of the triode Q2 and the other end of the capacitor C1 are connected with the ground end of the power supply control module.
As another specific embodiment of the power supply control module, the power supply control module is characterized in that: the circuit comprises a triode Q2, a triode Q3, a triode Q4, a resistor R11, a capacitor C1 and a resistor R12; the base electrode of the triode Q2 is used as the input end of the power supply control module; one end of the resistor R12 is used as a power supply end of the power supply control module, and the other end of the resistor R12 is connected with one end of the resistor R11 and an emitter of the triode Q4; the other end of the resistor R11 is connected with an emitter of the triode Q2 and a base of the triode Q3; the collector of the triode Q3 is connected with the base of the triode Q4; the emitter of the triode Q3 is connected with the collector of the triode Q4 and one end of the capacitor C1, and the connection point of the triode Q3 is used as the output end of the power supply control module; the collector of the triode Q2 is connected with the other end of the capacitor C1, and the connection point of the triode Q2 and the capacitor C1 is used as the ground end of the power supply control module.
The working principle of the present invention will be described in detail with reference to specific embodiments, which are not repeated herein.
The utility model has the advantages as follows:
1. the temperature acquisition and processing module detects the temperature inside the product, and the signal processing module controls the power supply voltage supplied to the fan according to the temperature, controls the rotating speed of the fan, reduces the loss of the fan caused by unreasonable control and improves the average efficiency of the product;
2. the signal processing module sets the threshold value of the required temperature point through pure hardware processing, so that the rotation of the fan is controlled more reasonably and reliably;
3. the utility model discloses, by simple circuit combination, can design reasonable parameter through simple and convenient calculation, the design of being convenient for, easily debugging, the cost is lower.
Drawings
FIG. 1 is a schematic block diagram of the present invention;
fig. 2 is a schematic circuit diagram of a first embodiment of the present invention;
fig. 3 is a schematic circuit diagram of a second embodiment of the present invention;
fig. 4 is a schematic circuit diagram of a third embodiment of the present invention.
Detailed Description
Fig. 1 is a schematic circuit block diagram of the present invention, which includes a temperature acquisition and processing module, a signal processing module, and a power supply control module; the input end of the temperature acquisition and processing module is used as the input end of a power supply control circuit of the fan and is connected with an input voltage VIN; the output end of the power supply control module is used as the output end of a power supply control circuit of the fan and is connected with the input end of the fan; the power supply end of the signal processing module and the power supply end of the power supply control module are connected with an input voltage VIN; the output end of the temperature acquisition and processing module is connected with the input end of the signal processing module; the output end of the signal processing module is connected with the input end of the power supply control module; the temperature acquisition and processing module, the signal processing module and the power supply control module are all connected with a reference ground;
the temperature acquisition and processing module is used for acquiring temperature information and processing the temperature information into a circuit signal and outputting the circuit signal to the signal processing module; the signal processing module is used for receiving the circuit signal output by the temperature acquisition and processing module, processing the circuit signal into a circuit control signal and outputting the circuit control signal to the power supply control module; the power supply control module is used for receiving the circuit control signal output by the signal processing module and controlling the voltage according to the circuit control signal so as to control the rotating speed of the fan.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the following specific embodiments and accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
First embodiment
Fig. 2 is a schematic diagram of a power supply control circuit of the fan according to the embodiment of the present invention, as shown in the figure:
the temperature acquisition and processing module comprises a negative temperature coefficient thermistor RntcResistor R1 and operational amplifier U1A in a connected relationshipComprises the following steps: negative temperature coefficient thermistor RntcOne end of the temperature acquisition and processing module is used as the input end of a power supply control circuit of the fan and is connected with an input voltage VIN; negative temperature coefficient thermistor RntcThe other end of the resistor is connected with one end of a resistor R1, and the connection point of the resistor R1 is connected with the non-inverting input end of an operational amplifier U1A; the output end of the operational amplifier U1A is connected with the negative phase input end of the operational amplifier U1A, and the connection point of the operational amplifier U1A is used as a new output end of the temperature acquisition and processing module; the other end of the resistor R1 is connected to a reference ground.
The signal processing module comprises an operational amplifier U1B, an operational amplifier U1C, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a diode D1 and a MOS transistor Q1, and the connection relations are as follows: one end of the resistor R2 is connected with one end of the resistor R3, and the connection point of the resistor R2 is used as the input end of the signal processing module and is connected with the output end of the temperature acquisition and processing module; the other end of the resistor R2 is connected with the non-inverting input end of the operational amplifier U1B; the negative phase input end of the operational amplifier U1B is connected with one end of a resistor R4 and one end of a resistor R5; the other end of the resistor R5 and one end of the resistor R6 are connected with the output end of the operational amplifier U1B; the other end of the resistor R6 is connected with the drain electrode of the MOS transistor Q1, and the connection point of the resistor R6 is used as the output end of the signal processing module; the other end of the resistor R3 is connected with the negative phase input end of the operational amplifier U1C; one end of the resistor R9 is connected to the anode of the diode D1; the cathode of the diode D1, one end of the resistor R10 and the gate of the MOS transistor Q1 are connected with the output end of the operational amplifier U1C; the other end of the resistor R10 is connected with one end of the resistor R7, and the connection point of the resistor R10 is used as a power supply end of the signal processing module and is connected with an input voltage VIN; the other end of the resistor R7, one end of the resistor R8 and the other end of the resistor R9 are connected with the non-inverting input end of the operational amplifier U1C; the other end of the resistor R4, the other end of the resistor R8 and the source of the MOS transistor Q1 are connected with the reference ground.
The power supply control module comprises a resistor R11, a resistor R12, a capacitor C1, a triode Q2, a triode Q3 and a triode Q4, and the connection relations are as follows: the base electrode of the triode Q2 is used as the input end of the power supply control module and is connected with the output end of the signal processing module; one end of the resistor R12 is used as a power supply end of the power supply control module and is connected with an input voltage VIN; the other end of the resistor R12 and one end of the resistor R11 are connected with an emitter of the triode Q4; the other end of the resistor R11 is connected with an emitting electrode of the triode Q2 and a base electrode of the triode Q3; the collector of the triode Q3 is connected with the base of the triode Q4; an emitter of the triode Q3 is connected with a collector of the triode Q4 and one end of the capacitor C1, and a connection point of the triode Q3 is the output end of the power supply control module, is used as the output end of the power supply control circuit of the fan and is connected with the input end of the fan; the collector of the transistor Q2 and the other end of the capacitor C1 are connected to ground.
The utility model discloses the theory of operation of first embodiment does:
the input voltage VIN passes through the resistor R1 and the negative temperature coefficient thermistor RntcVoltage division generating voltage U1Voltage U1Filtered by a voltage follower formed by an operational amplifier U1A and used as an output voltage signal U of the temperature acquisition and processing module2,U1＝U2(ii) a Output voltage signal U2The input end of the signal processing module is connected, and the input end of the signal processing module is respectively connected with the positive phase input end of the operational amplifier U1B and the positive phase input end of the operational amplifier U1C through a resistor R2 and a resistor R3; the operational amplifier U1B, the resistor R4 and the resistor R5 form a voltage positive feedback amplifying circuit, the positive phase input end of the operational amplifier U1B is the input end of the voltage positive feedback amplifying circuit, the output end of the operational amplifier U1B is the output end of the voltage positive feedback amplifying circuit, and the voltage signal U12The output voltage U is amplified by a voltage positive feedback amplifying circuit consisting of an operational amplifier U1B2-1Then the current is limited by a resistor R6 to output a voltage signal U3As an output signal of the signal processing module; the operational amplifier U1C, the resistor R7, the resistor R8, the resistor R9, and the diode D1 form a voltage hysteresis comparator, and the input voltage VIN is divided by the resistor R7 and the resistor R8 to generate a reference voltage U of the hysteresis comparator4Voltage signal U2Through a resistor R3 and a reference voltage U4Comparing when U is2<U4The voltage hysteresis comparison circuit outputs a high voltage UHControlling the MOS transistor Q1 to be conducted and the voltage signal U3Will be pulled down, U30; when U is turned2>U4The voltage hysteresis comparison circuit outputs a low voltage ULControlling the MOS transistor Q1 to be cut off, and controlling the voltage signal U3＝U2-1(ii) a Voltage signal U3The input end of the power supply and control circuit is the base voltage of the PNP triode Q2, the PNP triode Q2 is controlled to be in an amplification region, and the input voltage VIN provides the voltage U for the emitting electrode of the PNP triode Q2 through the resistor R11 and the resistor R125，U5＝U3+UD(UDConduction voltage drop for PN junction in PNP triode); the NPN triode Q3 and the PNP triode Q4 form a composite triode (Darlington tube), and the model of the composite triode is equivalent to an NPN triode; voltage U5The base electrode of the composite triode is connected to control the composite NPN triode in the amplification region, and the emitter voltage U of the composite triode6，U6＝U5-UD＝U3(UDConduction voltage drop of PN junction in NPN triode), voltage U6The output voltage of the power supply control module is used as the output voltage of the power supply control circuit of the fan.
Negative temperature coefficient thermistor R after power-onntcLarge resistance, temperature collection and processing module output voltage U2Is less than the reference voltage U in the signal processing module4The voltage hysteresis comparison circuit in the signal processing module outputs a high voltage UHThe MOS tube Q1 is controlled to be conducted, and the signal processing module outputs a voltage U3The base voltage of the PNP triode Q2 is low voltage, the saturation conduction of the Q2 is controlled, and the emitter voltage U of the Q2 is controlled5The base voltage of the composite triode is low, the composite triode is cut off, and the power supply control module outputs a voltage U6Low voltage.
After loading, the temperature of the element to be tested continuously rises, and the thermistor RntcSmall resistance value, voltage U2Rise, U2The voltage U is output after passing through a positive feedback amplifying circuit in the signal processing module2-1(ii) a When voltage U2Greater than the reference voltage U in the signal processing module4The hysteresis comparison circuit outputs a low voltage ULControlling the MOS tube Q1 to be cut off, and controlling the output voltage U of the signal processing module3＝U2-1The base voltage of the PNP triode Q2 is U3Controlling the PNP triode Q2 to be in an amplification area, and the voltage of an emitter to be U5Base voltage U of composite triode5＝U3+UDThe composite triode is in the amplification region, and the emitter voltage U of the composite triode6，U6＝U5-UD＝U3Output voltage U of power supply control module6Equal to the output voltage U of the signal processing module3Equal to the output voltage U of the positive feedback amplifying circuit in the signal processing module2-1And U is2-1Voltage and temperature acquisition and processing module output voltage U2In a linear relationship, the temperature acquisition and processing module outputs a voltage U2Equal to the resistance R1 and the thermistor RNTCVoltage U generated by voltage division1Voltage U1Related to the temperature of the measured element; output voltage U of power supply control module6The temperature of the tested element changes within a certain range.
The negative temperature coefficient thermistor converts the temperature change into the resistance value change in the circuit, and then converts the resistance value change into the voltage signal change through the voltage division function of the series resistor. Compared with other temperature elements, the circuit has the advantages of simple structure, low cost, capability of reflecting the change of the measured temperature in real time and the like.
The hysteresis comparison circuit is composed of basic elements, has simple structure, can set fan starting voltage in a wider range, and is suitable for various fan voltage types.
The positive feedback amplifying circuit is composed of basic elements, is simple in structure, can set proper full-speed rotation voltage of the fan according to the actual condition of a product, and is applicable to various fan voltage types.
The final realized technical effects are as follows: when the temperature exceeds a set threshold temperature point, the fan starts to rotate at a low speed; when the temperature rises, the rotating speed of the fan is increased, and when the temperature exceeds a certain threshold temperature point, the fan starts to rotate at full speed, so that the electric energy is fully utilized.
Second embodiment
As shown in FIG. 3, isThe circuit schematic diagram of the second embodiment of the present invention is different from the first embodiment in that the temperature acquisition and processing module is provided with no operational amplifier U1A, and the ntc thermistor RntcAnd the connection point of one end of the resistor R1 and one end of the resistor R1 is used as the output end of the temperature acquisition and processing module and is connected with the input end of the signal processing module.
The second embodiment is simpler in structure and lower in cost than the first embodiment.
The working principle of this embodiment is the same as that of the first embodiment, and will not be described herein.
Third embodiment
As shown in fig. 4, a schematic circuit diagram according to a third embodiment of the present invention is different from the first embodiment in that the reference voltage V is connected to one end of the resistor R7 in the signal processing moduleerf。
Reference voltage V in the third embodimenterfCompared with the first embodiment, the voltage setting device is connected with one end of the resistor R7, the accuracy of voltage setting is higher, the influence of environment is smaller, and the reliability is better.
The working principle of this embodiment is the same as that of the first embodiment, and will not be described herein.
The above embodiments are only used to help understanding the inventive concept, and it will be obvious to those skilled in the art that other equivalent applications naturally conceivable from the above description and examples, and that several improvements and modifications of the present invention may be made without departing from the principles of the present invention, and all fall within the scope of the claims of the present invention, such as removing the resistor R12 or replacing the resistor R12 with a fuse. In addition, all the connection relations referred to in the patent do not mean that the components are directly connected, but mean that a better connection structure can be formed by adding or reducing connection auxiliary components according to specific implementation conditions. The utility model provides an each technical feature can the interactive combination under the prerequisite of conflict each other.
Claims (8)
1. A power supply control circuit of a fan, characterized in that: the temperature acquisition and processing module, the signal processing module and the power supply control module are included;
the input end of the temperature acquisition and processing module is used as the input end of a power supply control circuit of the fan and is connected with an input voltage VIN; the output end of the power supply control module is used as the output end of a power supply control circuit of the fan and is connected with the input end of the fan; the power supply end of the signal processing module and the power supply end of the power supply control module are connected with an input voltage VIN; the output end of the temperature acquisition and processing module is connected with the input end of the signal processing module; the output end of the signal processing module is connected with the input end of the power supply control module; the ground ends of the temperature acquisition and processing module, the signal processing module and the power supply control module are all connected with a reference ground;
the temperature acquisition and processing module is used for monitoring the temperature of the measured point and converting a temperature signal into a voltage signal and outputting the voltage signal to the signal processing module; the signal processing module is used for processing the voltage signal output by the temperature acquisition and processing module, setting a voltage value corresponding to the temperature point at which the fan starts to rotate, and outputting a proper voltage signal after comparing the two voltage values; the power supply control module is used for receiving the voltage signal output by the signal processing module, determining the power supply voltage of the fan and controlling the rotating speed of the fan.
2. The power supply control circuit of a fan according to claim 1, characterized in that: the temperature acquisition and processing module comprises a thermistor RntcA resistor R1;
thermistor RntcOne end of the voltage-stabilizing circuit is connected with an input voltage VIN as an input end of the temperature acquisition and processing module; thermistor RntcThe other end of the resistor is connected with one end of a resistor R1, and the connection point of the resistor R1 is used as the output end of the temperature acquisition and processing module; the other end of the resistor R1 is connected with the ground end of the temperature acquisition and processing module.
3. The power supply control circuit of a fan according to claim 1, characterized in that: the temperature acquisition and processing module comprises a thermistor RntcA resistor R1, an operational amplifier U1A;
thermistor RntcOne end of the voltage-stabilizing circuit is connected with an input voltage VIN as an input end of the temperature acquisition and processing module; thermistor RntcThe other end of the resistor is connected with one end of a resistor R1, and the connection point of the resistor R1 is connected with the non-inverting input end of an operational amplifier U1A; the output end of the operational amplifier U1A is connected with the negative phase input end of the operational amplifier U1A, and the connection point of the operational amplifier U1A is used as the output end of the temperature acquisition and processing module; the other end of the resistor R1 is connected with the ground end of the temperature acquisition and processing module.
4. The power supply control circuit of the fan according to claim 2 or claim 3, characterized in that: the thermistor RntcIs a negative temperature coefficient thermistor.
5. The power supply control circuit of a fan according to claim 1, characterized in that: the signal processing module comprises a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R10, an operational amplifier U1B, an operational amplifier U1C, a MOS tube Q1 and a diode D1;
one end of the resistor R2 is connected with one end of the resistor R3, and the connection point of the resistor R2 is used as the input end of the signal processing module; the other end of the resistor R2 is connected with the non-inverting input end of the operational amplifier U1B; the negative phase input end of the operational amplifier U1B is connected with one end of the resistor R4 and one end of the resistor R5; the other end of the resistor R5 and one end of the resistor R6 are connected with the output end of the operational amplifier U1B; the other end of the resistor R6 is connected with the drain electrode of the MOS transistor Q1, and the connection point of the resistor R6 is used as the output end of the signal processing module; the other end of the resistor R3 is connected with the negative phase input end of the operational amplifier U1C; one end of the resistor R10 and one end of the resistor R7 are connected with an input voltage VIN; the other end of the resistor R7, one end of the resistor R8 and one end of the resistor R9 are connected with the non-inverting input end of the operational amplifier U1C; the other end of the resistor R9 is connected with the anode of the diode D1; the cathode of the diode D1, the other end of the resistor R10 and the gate of the MOS transistor Q1 are connected with the output end of the operational amplifier U1C; the other end of the resistor R4, the other end of the resistor R8 and the source of the MOS transistor Q1 are connected with the ground end of the signal processing module.
6. The power supply control circuit of a fan according to claim 5, characterized in that: one end of the resistor R7 is connected to the reference voltage Verf, and one end of the resistor R10 is connected to the input voltage VIN.
7. The power supply control circuit of a fan according to claim 1, characterized in that: the power supply control module comprises a triode Q2, a triode Q3, a triode Q4, a resistor R11 and a capacitor C1;
the base electrode of the triode Q2 is used as the input end of the power supply control module; one end of the resistor R11 is connected with the emitter of the triode Q4, and the connection point of the resistor R11 is used as the power supply end of the power supply control module; the other end of the resistor R11 is connected with an emitter of the triode Q2 and a base of the triode Q3; the collector of the triode Q3 is connected with the base of the triode Q4; the emitter of the triode Q3 is connected with the collector of the triode Q4 and one end of the capacitor C1, and the connection point of the triode Q3 is used as the output end of the power supply control module; the collector of the triode Q2 and the other end of the capacitor C1 are connected with the ground end of the power supply control module.
8. The power supply control circuit of a fan according to claim 1, characterized in that: the power supply control module comprises a triode Q2, a triode Q3, a triode Q4, a resistor R11, a capacitor C1 and a resistor R12;
the base electrode of the triode Q2 is used as the input end of the power supply control module; one end of the resistor R12 is used as a power supply end of the power supply control module, and the other end of the resistor R12 is connected with one end of the resistor R11 and an emitter of the triode Q4; the other end of the resistor R11 is connected with an emitter of the triode Q2 and a base of the triode Q3; the collector of the triode Q3 is connected with the base of the triode Q4; the emitter of the triode Q3 is connected with the collector of the triode Q4 and one end of the capacitor C1, and the connection point of the triode Q3 is used as the output end of the power supply control module; the collector of the triode Q2 is connected with the other end of the capacitor C1, and the connection point of the triode Q2 and the capacitor C1 is used as the ground end of the power supply control module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921428055.7U CN210769463U (en) | 2019-08-30 | 2019-08-30 | Power supply control circuit of fan |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921428055.7U CN210769463U (en) | 2019-08-30 | 2019-08-30 | Power supply control circuit of fan |
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| CN210769463U true CN210769463U (en) | 2020-06-16 |
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| CN201921428055.7U Active CN210769463U (en) | 2019-08-30 | 2019-08-30 | Power supply control circuit of fan |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112181010A (en) * | 2020-09-23 | 2021-01-05 | 普联国际有限公司 | Temperature control method and device of router, storage medium and router |
| CN112327305A (en) * | 2020-11-06 | 2021-02-05 | 中国人民解放军海军潜艇学院 | Rapid frequency domain broadband MVDR sonar wave beam forming method |
| CN112612312A (en) * | 2020-12-15 | 2021-04-06 | 青岛海信日立空调系统有限公司 | Heat dissipation control circuit and air conditioner |
-
2019
- 2019-08-30 CN CN201921428055.7U patent/CN210769463U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112181010A (en) * | 2020-09-23 | 2021-01-05 | 普联国际有限公司 | Temperature control method and device of router, storage medium and router |
| CN112327305A (en) * | 2020-11-06 | 2021-02-05 | 中国人民解放军海军潜艇学院 | Rapid frequency domain broadband MVDR sonar wave beam forming method |
| CN112612312A (en) * | 2020-12-15 | 2021-04-06 | 青岛海信日立空调系统有限公司 | Heat dissipation control circuit and air conditioner |
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