CN111237228B - Control circuit with speed regulation function - Google Patents

Control circuit with speed regulation function Download PDF

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Publication number
CN111237228B
CN111237228B CN201811430530.4A CN201811430530A CN111237228B CN 111237228 B CN111237228 B CN 111237228B CN 201811430530 A CN201811430530 A CN 201811430530A CN 111237228 B CN111237228 B CN 111237228B
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China
Prior art keywords
coupled
bipolar junction
control circuit
speed regulation
junction transistor
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CN201811430530.4A
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Chinese (zh)
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CN111237228A (en
Inventor
李楠
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MEAN WELL (GUANGZHOU) ELECTRONICS CO Ltd
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MEAN WELL (GUANGZHOU) ELECTRONICS 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P7/00—Arrangements for regulating or controlling the speed or torque of electric DC motors
    • H02P7/06—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current
    • H02P7/18—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power
    • H02P7/24—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices
    • H02P7/28—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices
    • H02P7/285—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices controlling armature supply only
    • H02P7/29—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices controlling armature supply only using pulse modulation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Electric Motors In General (AREA)

Abstract

The invention provides a control circuit with a speed regulation function, which mainly comprises a filtering unit, a Darlington pair unit, an amplifying unit and a feedback resistor. Therefore, through the normal work of the Darlington pair unit, the amplifying unit and the feedback resistor, the output voltage output by the control circuit with the speed regulating function can reach the maximum output voltage when the pulse width modulation signal is in 80% of the working period, and the effect of linear control can be achieved.

Description

Control circuit with speed regulation function
Technical Field
The present disclosure relates to fan power control circuits, and particularly to a control circuit with a speed regulation function.
Background
Fan speed regulators are widely used in various fan products to meet the rotational speed requirements of different fan products, for example: direct current fans, heat dissipation fans, and the like. As is well known to those skilled in the art, a fan governor generally comprises a rectifier and a voltage control device for regulating the output voltage.
Referring to fig. 1, fig. 1 is a circuit diagram of a conventional fan speed regulation circuit. As shown in fig. 1, a conventional fan speed regulation circuit 1 ' is composed of an integral rectification unit 10 ', a current control circuit 11 ', and an amplification unit 12 ', wherein the current control circuit 11 ' includes a PNP transistor Q1And a current limiting resistor R1', the amplifying unit 12' includes an NPN transistor Q2'. It should be noted that the integral rectification unit 10' is used for converting a pulse width modulation signal into an analog voltage signal.
As mentioned above, when the duty cycle of the pwm signal is increased, the NPN transistor Q is turned on2' exhibits a low resistance state, thereby enabling an output voltage Vout' increase. In contrast, when the duty cycle of the pwm signal is reduced, the PNP transistor Q1' with the NPN transistor Q2Are all turned off, thereby making the output voltage Vout' become gradually smaller. Due to the output voltage Vout' full dependence on the PNP transistor Q1' with the NPN transistor Q2' such that the output voltage Vout' non-linear relation with the duty cycle of the PWM signal not only causes high power consumption but also causes by the fanThe noise is also large.
Therefore, in view of the practical defects of the conventional fan speed control circuit 1', the inventors of the present invention have made intensive studies and finally completed the present invention to provide a control circuit with a speed control function.
Disclosure of Invention
The invention mainly aims to provide a control circuit with a speed regulation function, which mainly comprises a filtering unit, a Darlington pair unit, an amplifying unit and a feedback resistor. Therefore, through the normal work of the Darlington pair unit, the amplifying unit and the feedback resistor, the output voltage output by a control circuit with the speed regulating function can reach the maximum output voltage when the pulse width modulation signal is in 80% of the working period, and the linear control effect can be achieved.
In order to achieve the above object, a control circuit with a speed regulation function is provided, including:
a filter unit coupled to a pulse width modulation signal;
a darlington pair unit coupled to an input voltage;
the amplifying unit is coupled between the filtering unit and the Darlington pair unit; and
and the feedback resistor is coupled between the Darlington pair unit and the amplifying unit.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to implement them in accordance with the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.
Drawings
FIG. 1 is a circuit diagram of a conventional fan speed regulation circuit; and
fig. 2 is a control circuit diagram with a speed regulation function according to the present invention.
The main symbols in the figures illustrate:
11 filter unit
12 darlington pair unit
13 amplifying unit
14 feedback resistor
R1First voltage dividing resistor
R2Second voltage dividing resistor
R3Third voltage dividing resistor
Q1First bipolar junction transistor
Q2Second bipolar junction transistor
Q3Third bipolar junction transistor
VoutOutput voltage
VinInput voltage
1' existing FENG Fan speed governing Circuit
10' integral rectification unit
11' current control circuit
12' amplification unit
Q1' PNP transistor
Q2' NPN transistor
R1' Current limiting resistor
Vout' output voltage
Detailed Description
In order to more clearly describe the control circuit with speed regulation function in the present invention, the following will describe the preferred embodiments of the present invention in detail with reference to the accompanying drawings.
Referring to fig. 2, fig. 2 is a control circuit diagram with a speed regulation function. As shown in fig. 2, the control circuit having the speed regulation function includes: a filter unit 11, a darlington pair unit 12, an amplifying unit 13, and a feedback resistor 14, wherein the filter unit 11 is coupled to a pwm signal, and the darlington pair unit 12 is coupled to an input voltage VinThe amplifying unit 13 is coupled between the filtering unit 11 and the darlington pair unit 12, and the feedback resistor 14 is coupled between the darlington pair unit 12 and the amplifying unit 13.
In the present invention, the Darlington pair unit 12 is a masterTo include a first voltage dividing resistor R1A first bipolar junction transistor Q1A second voltage dividing resistor R2A second bipolar junction transistor Q2Wherein the first voltage dividing resistor R1Is coupled to the input voltage VinThe first bipolar junction transistor Q1Is coupled to the input voltage VinA base thereof is coupled to the first voltage dividing resistor R1And a collector coupled to one end of the feedback resistor 14, the second voltage-dividing resistor R2Is coupled to the first bipolar junction transistor Q1Base of (2), second bipolar junction transistor Q2Is coupled to the first bipolar junction transistor Q1A collector of which is coupled to the first bipolar junction transistor Q1And a base coupled to the second voltage-dividing resistor R2And the other end of the same.
In particular, the amplifying unit 13 further comprises a third voltage dividing resistor R3And a third bipolar junction transistor Q3Wherein the third voltage dividing resistor R3Is coupled to the second bipolar junction transistor Q2And the third bipolar junction transistor Q3Is coupled to the third voltage dividing resistor R3And a base thereof is coupled to the filter unit 11, and an emitter thereof is coupled to the other end of the feedback resistor 14. So configured, the filtering unit 11 is a second-order low-pass filter, the first bipolar junction transistor Q1And the second bipolar junction transistor Q2Is a PNP type bipolar junction transistor, the third bipolar junction transistor Q3Is an NPN type bipolar junction transistor, and the output voltage VoutThe maximum output voltage of 12V can be achieved when the duty cycle of the pulse width modulation signal is 80%, and the effect of linear control can be achieved.
As described above, the components and technical features of the control circuit with speed regulation function of the present invention have been clearly and completely described, and in combination with the above, it can be seen that the present invention has the following advantages:
unlike the prior art in which the fan speed regulator is composed of a rectifying element and a voltage control element to solve the problem of high energy consumption, the present invention provides a control circuit with speed regulation function composed of a filter unit 11, a darlington pair unit 12, an amplifying unit 13, and a feedback resistor 14. Thus, through the normal operation of the darlington pair unit 12, the amplifying unit 13 and the feedback resistor 14, an output voltage V outputted by a control circuit with a speed regulating function can be enabledoutThe maximum output voltage can be achieved when the pulse width modulation signal has a duty cycle of 80%, and the effect of linear control can be achieved.
It should be emphasized that the above detailed description is specific to possible embodiments of the invention, and such embodiments are not intended to limit the scope of the invention, as such equivalent implementations or modifications should be included within the scope of the present patent application without departing from the technical spirit of the invention.

Claims (3)

1. A control circuit with a speed regulation function is characterized by comprising:
an input terminal coupled to an input voltage;
an output terminal for outputting an output voltage;
a ground terminal;
a darlington pair cell comprising:
a first bipolar junction transistor having an emitter coupled to the input terminal for receiving the input voltage and a collector coupled to the output terminal;
a first voltage dividing resistor coupled between the emitter and the base of the first bipolar junction transistor;
a second BJT having an emitter coupled to the base of the first BJT and a collector coupled to the output terminal; and
a second voltage divider coupled between the emitter and the base of the second bipolar junction transistor;
a third voltage dividing resistor having one end coupled to the base of the second BJT;
a third bipolar junction transistor, the collector of which is coupled to the other end of the third voltage dividing resistor and the emitter of which is coupled to the ground terminal;
a second-order low-pass filter coupled to a pulse width modulation signal, the ground terminal and the base of the third bipolar junction transistor; and
a feedback resistor, one end of which is coupled to the emitter of the third BJT, and the other end of which is coupled to the output terminal.
2. The control circuit with speed regulation function as claimed in claim 1, wherein the first and second bipolar junction transistors are PNP-type bipolar junction transistors.
3. The control circuit with speed regulation function as claimed in claim 1, wherein the third bjt is an NPN-type bjt.
CN201811430530.4A 2018-11-28 2018-11-28 Control circuit with speed regulation function Active CN111237228B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201811430530.4A CN111237228B (en) 2018-11-28 2018-11-28 Control circuit with speed regulation function

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201811430530.4A CN111237228B (en) 2018-11-28 2018-11-28 Control circuit with speed regulation function

Publications (2)

Publication Number Publication Date
CN111237228A CN111237228A (en) 2020-06-05
CN111237228B true CN111237228B (en) 2022-06-07

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201398183Y (en) * 2009-01-09 2010-02-03 冠捷投资有限公司 Power switch driving circuit
CN101770246A (en) * 2010-01-12 2010-07-07 福建星网锐捷网络有限公司 Fan speed-regulating control circuit and speed-regulating fan equipment
CN202605532U (en) * 2012-05-07 2012-12-19 西北大学 Electroporation medicine importing instrument
CN203840595U (en) * 2014-03-26 2014-09-17 重庆徐港电子有限公司 High-linearity large-dynamic light modulating circuit used for LED backlight source
CN108762365A (en) * 2018-06-29 2018-11-06 赵明 It is a kind of output isolation can PWM regulation and control constant-current source circuit

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201398183Y (en) * 2009-01-09 2010-02-03 冠捷投资有限公司 Power switch driving circuit
CN101770246A (en) * 2010-01-12 2010-07-07 福建星网锐捷网络有限公司 Fan speed-regulating control circuit and speed-regulating fan equipment
CN202605532U (en) * 2012-05-07 2012-12-19 西北大学 Electroporation medicine importing instrument
CN203840595U (en) * 2014-03-26 2014-09-17 重庆徐港电子有限公司 High-linearity large-dynamic light modulating circuit used for LED backlight source
CN108762365A (en) * 2018-06-29 2018-11-06 赵明 It is a kind of output isolation can PWM regulation and control constant-current source circuit

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