CN109209966B - Constant-current system and method of fan - Google Patents

Constant-current system and method of fan Download PDF

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Publication number
CN109209966B
CN109209966B CN201811083216.3A CN201811083216A CN109209966B CN 109209966 B CN109209966 B CN 109209966B CN 201811083216 A CN201811083216 A CN 201811083216A CN 109209966 B CN109209966 B CN 109209966B
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module
voltage
capacitor
resistor
fan
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CN109209966A (en
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邓端崇
赫笑然
谭楚斌
许啟健
王苗
阴波波
高云峰
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Han s Laser Technology Industry Group Co Ltd
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Han s Laser Technology Industry Group Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
    • F04D27/004—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids by varying driving speed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2270/00—Control
    • F05D2270/30—Control parameters, e.g. input parameters
    • F05D2270/303—Temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2270/00—Control
    • F05D2270/40—Type of control system
    • F05D2270/42—Type of control system passive or reactive, e.g. using large wind vanes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2270/00—Control
    • F05D2270/70—Type of control algorithm
    • F05D2270/703—Type of control algorithm integral

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Direct Current Motors (AREA)
  • Control Of Positive-Displacement Air Blowers (AREA)

Abstract

The invention relates to the field of constant current systems, in particular to a constant current system and a method of a fan. The constant-current control of the fan is realized by acquiring the temperature signal in the fan and adjusting the wind power output of the fan in real time according to the temperature signal, and the fan can output different levels of air volume.

Description

Constant-current system and method of fan
Technical Field
The invention relates to the field of constant current systems, in particular to a constant current system and a method of a fan.
Background
The fan is a machine which increases the gas pressure and discharges the gas by means of the input mechanical energy. In the use process, the output voltage needs to be adjusted to control the wind power output of the fan, so that the constant current control of the fan is realized.
Conventionally, a constant current system for a fan is composed of two NPN transistors and some resistors, and the maximum current passing through the fan is locked by using the voltage of the BE electrode, which is relatively stable, of the transistor as a reference voltage, where the formula of the current is I ═ v (BE)/R. The structure is simple and easy to implement, but the defects are that larger current cannot BE passed, the voltages of BE poles of different types of tubes are not fixed values, even if the same type of tubes has difference, the voltages of the BE poles of various types need to BE known, and in addition, the voltages of the BE poles have certain fluctuation under different working currents, so that the constant current supply device is not suitable for precise constant current requirements.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a constant flow system and method for a wind turbine to solve the above-mentioned defects in the prior art, and solve the problem that the wind turbine cannot flexibly adjust the wind power output.
In order to solve the technical problem, the invention provides a constant current system of a fan, which comprises a temperature acquisition module, a control module, a conversion module, an integration module and a driving module, wherein the temperature acquisition module acquires a temperature signal in the fan, the control module outputs a corresponding PWM (pulse width modulation) signal according to the temperature signal, the conversion module converts the PWM signal into a direct current signal, the integration module integrates and feeds back the direct current signal into a driving signal, and the driving module drives the fan to output according to the driving signal.
Wherein, the preferred scheme is: the constant current system also comprises a voltage conversion module which is respectively connected with the integration module and the driving module, wherein the voltage conversion module converts 12V voltage into 5V voltage and transmits the 5V voltage to the integration module and the driving module.
Wherein, the preferred scheme is: the voltage conversion module comprises an integrator, a capacitor C4 connected with an input 12V voltage, and a capacitor C5 connected with the capacitor C4 in parallel, wherein the capacitor C4 and the capacitor C5 are also connected with an input end and a grounding end of the integrator, the voltage conversion module further comprises a capacitor C7 connected with an output 5V voltage, and a capacitor C6 connected with a capacitor C7 in parallel, and the capacitor C6 and the capacitor C7 are also connected with an output end and a grounding end of the integrator.
Wherein, the preferred scheme is: the voltage conversion module further comprises an LED tube connected with the output 5V voltage, and a resistor R43 with one end connected with the LED tube, and the other end of the resistor R43 is connected with a ground terminal.
Wherein, the preferred scheme is: the temperature acquisition module comprises a thermistor and an insulation resistor, wherein one end of the thermistor is connected with 3.3V voltage, one end of the insulation resistor is connected with a grounding end, and the connecting end of the thermistor and the insulation resistor is connected with the control module.
Wherein, the preferred scheme is: the conversion module comprises a resistor R39 connected with the control module, a resistor R40 connected with the resistor R39, and a capacitor C23 connected with the resistor R40 in parallel, wherein the connection end of the resistor R40 and the capacitor C23 is connected with the ground terminal.
Wherein, the preferred scheme is: the integration module comprises a first operational amplifier, a resistor R47 and a capacitor C26, wherein the positive phase input end of the first operational amplifier is connected with the conversion module, the negative phase input end of the first operational amplifier is connected with one end of the resistor R47, the other end of the resistor R47 is connected with one end of the capacitor C26, the other end of the capacitor C26 is connected with the output end of the operational amplifier, and the output end of the operational amplifier is also connected with the driving module.
Wherein, the preferred scheme is: the driving module comprises a voltage following submodule, a switch submodule, a reverse potential releasing submodule and a feedback submodule, the voltage following submodule is connected with the integrating module, the switch submodule is respectively connected with the voltage following submodule, the reverse potential releasing submodule and the feedback submodule, and the reverse potential releasing submodule is further connected with the fan.
Wherein, the preferred scheme is: the voltage following sub-module comprises a second operational amplifier, the positive phase input end of the second operational amplifier is connected with the integration module, the negative phase input end of the second operational amplifier is connected with the output end of the integration module, and the output end of the second operational amplifier is also connected with the switch sub-module; the release reverse potential submodule comprises a diode connected with the switch submodule and a capacitor C22 connected with the diode in parallel; the feedback submodule comprises an inverting input end connected with the first operational amplifier and a sampling resistor connected with the switch submodule, and the sampling resistor is also connected with a grounding end.
The invention also provides a constant current method of the fan, the constant current system is used for realizing the constant current method, and the constant current method comprises the following steps:
acquiring a temperature signal inside the fan;
outputting a corresponding PWM signal according to the temperature signal;
converting the PWM signal into a direct current signal;
integrating and feeding back the direct current signal into a driving signal;
and driving the fan to output according to the driving signal.
Compared with the prior art, the constant-current control method has the beneficial effects that by designing the constant-current system and the method of the fan, the constant-current control of the fan is realized by acquiring the temperature signal in the fan and then adjusting the wind power output of the fan in real time according to the temperature signal, and the fan can output different levels of wind volume; the conversion module converts the PWM signal into a stable direct current signal to prevent the fan from being blocked; the integration module and the driving module form closed-loop control, and can correct the operation process in real time and finely adjust the driving signal.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a block diagram of the constant current system of the present invention;
FIG. 2 is a circuit diagram of the temperature acquisition module and control module of the present invention;
FIG. 3 is a circuit diagram of a conversion module of the present invention;
FIG. 4 is a circuit diagram of an integration module of the present invention;
FIG. 5 is a circuit diagram of a driver module of the present invention;
FIG. 6 is a circuit diagram of a voltage conversion module of the present invention;
fig. 7 is a block flow diagram of the constant current method of the present invention.
Detailed Description
The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
As shown in fig. 1 and 6, the present invention provides a preferred embodiment of a constant flow system of a wind turbine.
Specifically, referring to fig. 1, a constant current system of a fan 10, the constant current system adopts an output power supply inside the fan 10 to realize power supply, the constant current system includes a temperature acquisition module 1, a control module 2, a conversion module 3, an integration module 4 and a driving module 5, the temperature acquisition module 1 is arranged inside the fan 10, the control module 2 is connected with the temperature acquisition module 1, the conversion module 3 is connected with the control module 2, the integration module 4 is connected with the conversion module 3, the driving module 5 is connected with the integration module 4, and the driving module 5 is further connected with the fan 10.
The temperature acquisition module 1 acquires a temperature signal inside the fan 10 through acquisition, the temperature signal is a voltage corresponding to a temperature value inside the fan 10 and transmits the temperature signal to the control module 2, the control module 2 outputs a corresponding PWM signal according to the temperature signal and transmits the PWM signal to the conversion module 3, the conversion module 3 converts the PWM signal into a stable direct current signal and transmits the direct current signal to the integration module 4, the integration module 4 integrates and feeds back the direct current signal into a driving signal and transmits the driving signal to the driving module 5, and the driving module 5 drives the fan 10 to output wind power according to the driving signal. Therefore, the wind power output condition of the fan 10 can be adjusted according to the temperature condition inside the fan 10, so that the fan 10 outputs different levels of wind volume in real time, the constant current control of the fan 10 is realized, and the purpose of energy conservation can be achieved.
More specifically, referring to fig. 2, the temperature acquisition module 1 includes a thermistor RT1 and an insulation resistor R907, one end of the thermistor RT1 is connected to a voltage of 3.3V, one end of the insulation resistor R907 is connected to a ground terminal, the other end of the thermistor RT1 and the other end of the insulation resistor R907 form a node, the node is a connection terminal, and the connection terminal is connected to the control module 2. The thermistor can sense the temperature change inside the fan 10, voltage division is realized through the thermistor RT1 and the insulation resistor R907, the temperature condition inside the fan 10 is measured and then converted into voltage, and the voltage is transmitted to the control module 2. After receiving the voltage, the control module 2 outputs a signal with a corresponding duty ratio to a subsequent module to control the driving signal, that is, to control the wind speed of the fan 10. When the temperature value inside the fan 10 reaches the set maximum temperature value, the control module 2 outputs a PWM signal with a duty ratio of 100%, that is, the fan 10 is controlled to rotate at the maximum wind speed. When the temperature value inside the fan 10 is lower than the maximum temperature value, the control module 2 outputs PWM signals of different levels according to the temperature values of different levels.
More specifically, referring to fig. 3, the conversion module 3 includes a resistor R39 connected to the control module 2, a resistor R40 connected in series to the resistor R39, and a capacitor C23 connected in parallel to the resistor R40, wherein the resistor R40 and the capacitor C23 form a node, the node is a connection terminal, and the connection terminal is connected to the ground terminal. A PWM _ DC region is located above the resistor R40 and the capacitor C23, a voltage U (PWM _ DC) of the PWM _ DC region is equal to a voltage U (fb) of the sampling resistor of the driving module 5, and a voltage U (fb) of the sampling resistor R50 is IR 1A 1R 1V, so that a frequency signal of 10KHZ is generated when the air volume of the fan 10 is adjusted, and only a frequency signal of 100HZ needs to pass through the converting module 3 to ensure stable input and output of the signal. Therefore, the resistance of the resistor R39 is set to 100K, the capacitance of the capacitor C23 is set to 0.1uf, the resistor R40 is calculated to be 30K according to F1/(2 PI RC), the voltage U (PWM) supplied to the control module 2 is 3.3V, the voltage U (PWM _ DC) in the PWM _ DC region is 1V, and the resistance of the resistor R40 is calculated to be 43K and greater than 30K according to the voltage division formula [ R40/(R40+ R39) ] -3.3V, thereby ensuring that the PWM signal can be filtered and converted into a stable direct current signal. Since the PWM signal received by the conversion module 3 is a high-low signal, if the PWM signal is directly used as the subsequent driving signal, the fan 10 may be stuck. Therefore, the conversion module 3 filters and converts the PWM signal into a stable dc signal, which is helpful for stable output of the subsequent driving signal and prevents the fan 10 from being stuck.
In this embodiment, referring to fig. 4, the integration module 4 includes a first operational amplifier, a resistor R47, and a capacitor C26, the first operational amplifier is of a model LM358, the resistor R47 has a resistance of 1K, the capacitor C26 has a capacitance of 0.01uf, a non-inverting input terminal of the first operational amplifier is connected to the conversion module 3, an inverting input terminal of the first operational amplifier is connected to one end of the resistor R47, the other end of the resistor R47 is connected to one end of the capacitor C26, the other end of the capacitor C26 is connected to an output terminal of the operational amplifier, and an output terminal of the operational amplifier is further connected to the driving module 5. The voltage fed back by the driving module 5 flows to the inverting input terminal of the first operational amplifier, and the virtual short principle is applied, i.e., U3+ is U3-, so long as the voltage U (PWM _ DC) at the positive input terminal of the first operational amplifier is limited, the current flowing through the fan 10 can be locked, and the constant current control of the fan 10 is realized. The integration module 4 has an output short-circuit protection function, and has the characteristics of wide voltage power supply range, low input bias current and the like.
Specifically, referring to fig. 5, the driving module 5 includes a voltage following submodule, a switch submodule, a reverse potential releasing submodule and a feedback submodule, the voltage following submodule is connected to the integrating module 4, the switch submodule is respectively connected to the voltage following submodule, the reverse potential releasing submodule and the feedback submodule, and the reverse potential releasing submodule is further connected to the fan 10. And when the switch submodule is in a switch-on state, the amplified driving signal is transmitted to the fan 10 again to drive the fan 10 to output the air volume. During the period of time when the switch submodule is disconnected, since the inside of the motor for driving the fan 10 is an inductive magnetic element, the element can generate a reverse potential which needs to be released in time, otherwise, the drive module 5 can be damaged when the work time is long, and therefore, the reverse potential releasing submodule can release the reverse potential. The feedback sub-module obtains a driving signal and feeds the driving signal back to the integrating module 4, in detail, the driving signal is fed back to the inverting input terminal of the first operational amplifier as a controlled output and returns to the input terminal as a control input terminal in a certain manner, and the control influence is exerted on the input terminal to realize closed-loop control. It is worth mentioning that the driving module 5 has the characteristics of high withstand voltage, low on-resistance, high electrostatic protection capability and the like.
More specifically, referring to fig. 5, the voltage follower sub-module includes a second operational amplifier, the model of the second operational amplifier is LM358, a non-inverting input terminal of the second operational amplifier is connected to the integration module 4, an inverting input terminal of the second operational amplifier is connected to an output terminal of the integration module, an output terminal of the second operational amplifier is further connected to the switch sub-module, an output terminal of the second operational amplifier outputs a driving signal, the driving signal is transmitted to the switch sub-module through a resistor R45 with a resistance value of 200R, and the voltage follower sub-module can amplify the buffer current.
And referring to fig. 5, the reverse potential releasing submodule comprises a diode D7 connected with a switch submodule and a capacitor C22 connected with the diode D7 in parallel, the capacitor C22 is also connected with a CN7 connected with a fan, the model of the diode of CN7 is 1N4148, and the capacitance value of the capacitor C22 is 1 uf. If the diode receives the reverse potential, the capacitor C22 may discharge the reverse potential to prevent the reverse potential from flowing through the fan 10.
In addition, referring to fig. 5, the feedback sub-module includes a sampling resistor R50, the resistance of the sampling resistor R50 is 1R, one end of the sampling resistor R50 is connected to the inverting input terminal of the first operational amplifier and to the switch sub-module, and the other end of the sampling resistor R50 is also connected to the ground terminal. The sampling resistor R50 feeds back to the inverting input terminal of the first operational amplifier after receiving the driving signal, so that the integrating module 4 and the driving module 5 form a closed-loop control. For example, when the current flowing through the fan 10 is 1A at most, the sampling resistor R50 may form a 1V voltage drop and feed back to the integrating module 4.
Further, referring to fig. 1, the constant current system further includes a voltage conversion module 6 respectively connected to the integration module 4 and the driving module 5, and the constant current system is powered by an output power supply inside the fan 10, and the voltage is 12V, so that the voltage conversion module 6 converts the 12V voltage into a 5V voltage, and transmits the 5V voltage to the integration module 4 and the driving module 5, so as to provide a 5V power supply for the integration module 4 and the driving module 5, thereby preventing the integration module 4 and the driving module 5 from being damaged due to an excessively high voltage. Specifically, a first operational amplifier and a second operational amplifier are connected at a voltage of 5V.
Specifically, referring to fig. 6, the voltage conversion module 6 includes an integrator, a capacitor C4 connected to an input 12V voltage, and a capacitor C5 connected in parallel to the capacitor C4, where the model of the integrator is L7805, the capacitor C4 and the capacitor C5 are further connected to an input terminal and a ground terminal of the integrator, the voltage conversion module 6 further includes a capacitor C7 connected to an output 5V voltage, and a capacitor C6 connected in parallel to the capacitor C7, and the capacitor C6 and the capacitor C7 are further connected to an output terminal and a ground terminal of the integrator. The integrator serves as a voltage stabilizing source, receives 12V voltage and converts the voltage into 5V voltage, and therefore support of 5V voltage is provided for the integrating module 4 and the driving module 5. It is worth mentioning that the voltage conversion module 6 has many characteristics of high output current, stable output voltage, output overload protection, thermal protection, short circuit protection, and the like.
Preferably, referring to fig. 6, the voltage conversion module 6 further includes an LED tube connected to the output 5V voltage, and a resistor R43 having one end connected to the LED tube, and the other end of the resistor R43 is connected to the ground. When the voltage conversion module 6 provides 5V voltage for the integration module 4 and the driving module 5, the LED lamp is turned on, so that an operator can know whether the power supply is normal only by observing the LED lamp. If the LED lamp is found to be abnormal, such as not bright, too dark or too bright, corresponding maintenance operation can be carried out.
As shown in fig. 7, the present invention further provides a preferred embodiment of a constant flow method of the wind turbine 10.
Specifically, referring to fig. 7, a constant current method of the wind turbine 10, where the constant current system is used to implement the constant current method, includes the following steps:
step 1, acquiring a temperature signal inside a fan 10;
step 2, outputting a corresponding PWM signal according to the temperature signal;
step 3, converting the PWM signal into a direct current signal;
step 4, integrating and feeding back the direct current signal into a driving signal;
and 5, driving the fan 10 to output according to the driving signal.
The temperature acquisition module 1 acquires a temperature signal inside the fan 10 through acquisition, the temperature signal is a voltage corresponding to a temperature value inside the fan 10 and transmits the temperature signal to the control module 2, the control module 2 outputs a corresponding PWM signal according to the temperature signal and transmits the PWM signal to the conversion module 3, the conversion module 3 converts the PWM signal into a stable direct current signal and transmits the direct current signal to the integration module 4, the integration module 4 integrates and feeds back the direct current signal into a driving signal and transmits the driving signal to the driving module 5, and the driving module 5 drives the fan 10 to output wind power according to the driving signal. Therefore, the wind power output condition of the fan 10 can be adjusted according to the temperature condition inside the fan 10, so that the fan 10 outputs different levels of wind volume in real time, the constant current control of the fan 10 is realized, and the purpose of energy conservation can be achieved.
In summary, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (8)

1. A constant current system of fan which characterized in that: the constant current system comprises a temperature acquisition module, a control module, a conversion module, an integration module and a drive module, wherein the temperature acquisition module acquires a temperature signal in the fan, the control module outputs a corresponding PWM signal according to the temperature signal, the conversion module converts the PWM signal into a direct current signal, the conversion module comprises a resistor R39 connected with the control module, a resistor R40 connected with a resistor R39 and a capacitor C23 connected with the resistor R40 in parallel, the connecting end of the resistor R40 and the capacitor C23 is connected with a grounding end, the integration module integrates and feeds back the direct current signal into the drive signal, the integration module comprises a first operational amplifier, a resistor R47 and a capacitor C26, the positive phase input end of the first operational amplifier is connected with the conversion module, the negative phase input end of the first operational amplifier is connected with one end of the resistor R47, the other end of the resistor R47 is connected with one end of the capacitor C26, and the other end of the capacitor C26 is connected, the output end of the operational amplifier is further connected with a driving module, the driving module drives the fan to output according to the driving signal, and the fed-back voltage flows to the inverting input end of the first operational amplifier.
2. The constant current system of claim 1, wherein: the constant current system also comprises a voltage conversion module which is respectively connected with the integration module and the driving module, wherein the voltage conversion module converts 12V voltage into 5V voltage and transmits the 5V voltage to the integration module and the driving module.
3. The constant current system of claim 2, wherein: the voltage conversion module comprises an integrator, a capacitor C4 connected with an input 12V voltage, and a capacitor C5 connected with the capacitor C4 in parallel, wherein the capacitor C4 and the capacitor C5 are also connected with an input end and a grounding end of the integrator, the voltage conversion module further comprises a capacitor C7 connected with an output 5V voltage, and a capacitor C6 connected with a capacitor C7 in parallel, and the capacitor C6 and the capacitor C7 are also connected with an output end and a grounding end of the integrator.
4. The constant current system of claim 3, wherein: the voltage conversion module further comprises an LED tube connected with the output 5V voltage, and a resistor R43 with one end connected with the LED tube, and the other end of the resistor R43 is connected with a ground terminal.
5. The constant current system of claim 1, wherein: the temperature acquisition module comprises a thermistor and an insulation resistor, wherein one end of the thermistor is connected with 3.3V voltage, one end of the insulation resistor is connected with a grounding end, and the connecting end of the thermistor and the insulation resistor is connected with the control module.
6. The constant current system of claim 1, wherein: the driving module comprises a voltage following submodule, a switch submodule, a reverse potential releasing submodule and a feedback submodule, the voltage following submodule is connected with the integrating module, the switch submodule is respectively connected with the voltage following submodule, the reverse potential releasing submodule and the feedback submodule, and the reverse potential releasing submodule is further connected with the fan.
7. The constant current system of claim 6, wherein: the voltage following sub-module comprises a second operational amplifier, the positive phase input end of the second operational amplifier is connected with the integration module, the negative phase input end of the second operational amplifier is connected with the output end of the integration module, and the output end of the second operational amplifier is also connected with the switch sub-module; the release reverse potential submodule comprises a diode connected with the switch submodule and a capacitor C22 connected with the diode in parallel; the feedback submodule comprises an inverting input end connected with the first operational amplifier and a sampling resistor connected with the switch submodule, and the sampling resistor is also connected with a grounding end.
8. A constant-current method of a fan, wherein the constant-current system according to any one of claims 1 to 7 is used for realizing the constant-current method, and the constant-current method comprises the following steps:
acquiring a temperature signal inside the fan;
outputting a corresponding PWM signal according to the temperature signal;
converting the PWM signal into a direct current signal;
integrating and feeding back the direct current signal into a driving signal;
and driving the fan to output according to the driving signal.
CN201811083216.3A 2018-09-17 2018-09-17 Constant-current system and method of fan Active CN109209966B (en)

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Publication number Priority date Publication date Assignee Title
JPH08186902A (en) * 1994-12-28 1996-07-16 Asmo Co Ltd Controller of motor for vehicle
CN100446402C (en) * 2004-10-08 2008-12-24 鸿富锦精密工业（深圳）有限公司 Circuit for starting DC fan
JP4582466B2 (en) * 2008-09-12 2010-11-17 アルプス電気株式会社 Motor control device
CN102400933A (en) * 2010-09-17 2012-04-04 鸿富锦精密工业（深圳）有限公司 Fan drive circuit
CN202957475U (en) * 2012-10-24 2013-05-29 四川省电力公司绵阳电业局 Heat radiation controller for switch cabinet
CN106647487A (en) * 2016-12-15 2017-05-10 山东金洲科瑞节能科技有限公司 Wireless indoor fan coil control system

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