CN107947654A - A kind of DC motor speed-regulating system with overload protection function - Google Patents

A kind of DC motor speed-regulating system with overload protection function Download PDF

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Publication number
CN107947654A
CN107947654A CN201810004161.6A CN201810004161A CN107947654A CN 107947654 A CN107947654 A CN 107947654A CN 201810004161 A CN201810004161 A CN 201810004161A CN 107947654 A CN107947654 A CN 107947654A
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CN
China
Prior art keywords
resistance
pins
control chip
collector
triode
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201810004161.6A
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Chinese (zh)
Inventor
王前明
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Sichuan New Technology Co Ltd For Flooding
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Sichuan New Technology Co Ltd For Flooding
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Application filed by Sichuan New Technology Co Ltd For Flooding filed Critical Sichuan New Technology Co Ltd For Flooding
Priority to CN201810004161.6A priority Critical patent/CN107947654A/en
Publication of CN107947654A publication Critical patent/CN107947654A/en
Pending legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
    • H02H7/0833—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors for electric motors with control arrangements
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
    • H02H7/085—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load
    • H02H7/0856—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load characterised by the protection measure taken
    • 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

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Direct Current Motors (AREA)

Abstract

The invention discloses a kind of DC motor speed-regulating system with overload protection function; it is characterized in that; including control chip U; the pulse-width modulation circuit being connected respectively with the UCC pins and DIS pins and T pins of control chip U; three collection tube drive circuits being connected respectively with the R pins and F pins and GND pins of control chip U, and the overload protecting circuit being connected respectively with the R pins of control chip U and three collection tube drive circuits.The configuration of the present invention is simple, it is highly practical, the pulse-width modulation circuit that the present invention is set can continuously be adjusted the duty cycle for exporting pulse, sufficiently pulsewidth is adjusted, without influencing frequency of oscillation, the duty cycle of pulse is reached 99.99%, ensure that the present invention can export the duty cycle of high impulse, solve the problems, such as that pulse width modulator is relatively low in the presence of the duty cycle of output square wave well.

Description

A kind of DC motor speed-regulating system with overload protection function
Technical field
The present invention relates to a kind of governing system, in particular to a kind of DC motor speed regulating system with overload protection function System.
Background technology
Dc motor is a kind of motor that direct current energy is converted to mechanical energy, because of its good speed adjusting performance It is used widely in Electric Traction.Dc motor is then to realize speed governing by pulse width modulator, its pulse width modulator Full name be:Pulse WidthModulator, abbreviation PWM.Pulse width modulator is made by varying the duty cycle of output square wave Average current power in load changes from 0-100%, so as to change the speed of dc motor.
However, the duty cycle of the output square wave of pulse width modulator is how left 50% used by existing dc motor It is right, that is to say, that the energy work rate of pulse width modulator output also only has 50% or so, and therefore, existing dc motor is used Pulse width modulator do not only exist output square wave duty cycle it is relatively low, also there are flimsy problem, cause dc motor Power is too low, causes dc motor energy work rate to be not fully utilized, so that existing pulse width modulator can not meet people Demand.
The content of the invention
Pulse width modulator does not only exist output side used by it is an object of the invention to overcome existing dc motor The duty cycle of ripple is relatively low, and also there are flimsy defect, there is provided a kind of DC motor speed regulating system with overload protection function System.
The purpose of the present invention passes through following technical proposals reality：A kind of DC motor speed regulating with overload protection function System, including control chip U, the pulsewidth modulation being connected respectively with the UCC pins and DIS pins and T pins of control chip U Circuit, three collection tube drive circuits being connected respectively with the R pins and F pins and GND pins of control chip U, and respectively The overload protecting circuit being connected with the R pins of control chip U and three collection tube drive circuits；The GND pins of the control chip U Ground connection.
The overload protecting circuit includes triode Q3, and anode is connected with the collector of triode Q3, cathode is through inductance The polar capacitor C3 being connected after L1 with the R pins of control chip U, one end with three collection tube drive circuits be connected, the other end with Resistance R8, the P pole that the collector of triode Q3 is connected is connected after resistance R9 with the collector of triode Q3, N poles and three The diode D4 that the emitter of pole pipe Q3 is grounded after being connected, wherein one end are connected with the base stage of triode Q3, the other end with The capacitance C4 that the collector of triode Q3 is connected, and one end is connected with the emitter of triode Q3, the other end and three poles The collector of pipe Q3 is collectively forming the resistance R10 of the output terminal of overload protecting circuit.
Further, the pulse-width modulation circuit be connected including one end with the UCC pins of control chip U, the other end with Resistance R1, the N pole that the DIS pins of control chip U are connected is connected after resistance R2 with the DIS pins of control chip U, P poles Diode D2, the P pole of ground connection is connected with the DIS pins of control chip U, P pole of the N poles after adjustable resistance R3 with diode D2 The diode D1 being connected, and wherein one end be connected after adjustable resistance R4 with the adjustable side of adjustable resistance R3, the other end The capacitance C1 of ground connection；The T pins of the control chip U are connected with the adjustable side of adjustable resistance R4.
Further, the three collection tube drive circuit includes three collector Q1, three collector Q2, one end and the base of three collector Q2 Resistance R5, the P pole that pole is connected, the other end is connected with the F pins of control chip U is connected with the F pins of control chip U, N The diode D3 that pole is connected after resistance R6 with the emitter of three collector Q2, cathode is connected with the collector of three collector Q1, The polar capacitor C2 that anode is connected with the N poles of diode D3, and one end is connected with the anode of polar capacitor C2, the other end The resistance R7 being connected with the GND pins of control chip U；The emitter of the three collectors Q1 is connected with the R pins of control chip U Connect, the base stage of three collector Q1 is connected with the collector of three collector Q2；The N poles ground connection of the diode D3；Three collector Collector of the collector of Q1 with triode Q3 after resistance R8 is connected, and the GND pins of the control chip U are through resistance R10 The emitter with triode Q3 is connected afterwards.
Further, the resistance R1 be diode D1 forward resistance, resistance R1=resistance R2=1k Ω；It is described Adjustable resistance R3 ＞ resistance R1 and resistance R2, and adjustable resistance R3=10M.The control chip U is NE555 integrated chips.
The present invention has the following advantages compared with prior art and beneficial effect：
(1) the configuration of the present invention is simple, highly practical, the pulse-width modulation circuit that the present invention is set can be to the duty of output pulse Than continuously being adjusted, i.e., sufficiently pulsewidth is adjusted, without influencing frequency of oscillation, reaches the duty cycle of pulse 99.99%, ensure that the present invention can export the duty cycle of high impulse, solve pulse width modulator well and there is output side The problem of duty cycle of ripple is relatively low.
(2) overload protecting circuit that sets of the present invention can be when the load of motor increases, i.e. the armature supply of motor During increase, three collection tube drive circuits are effectively protected, so as to ensure that the reliability of the present invention well.
(3) the three collection tube drive circuits that the present invention is set realize the accurate control of the keying to dc motor.
Brief description of the drawings
Fig. 1 is the integrated circuit structure diagram of the present invention.
Embodiment
The present invention is described in further detail with reference to embodiment, but embodiments of the present invention are not limited to This.
Embodiment
As shown in Figure 1, the invention discloses a kind of DC motor speed-regulating system with overload protection function, including control Coremaking piece U, the pulse-width modulation circuit being connected respectively with the UCC pins and DIS pins and T pins of control chip U, respectively with The R pins of control chip U be connected with F pins and GND pins three collection tube drive circuits, and respectively with control chip U R pins and three overload protecting circuits that are connected of collection tube drive circuits；The GND pins ground connection of the control chip U.
Control chip U in the present embodiment, which is preferentially employed, has the function of the NE555 integrated chips of pulse generation to realize, Control chip U is combined with pulse-width modulation circuit, the duty cycle of output pulse can be made continuously to be adjusted, i.e., pulsewidth obtains Sufficiently adjustment, the frequency of oscillation without influencing control chip U, makes the duty cycle of pulse reach 99.99%.
Further, the pulse-width modulation circuit includes resistance R1, resistance R2, adjustable resistance R3, adjustable resistance R4, two poles Pipe D1, diode D2, and capacitance C1.
During connection, one end of resistance R1 is connected with the UCC pins of control chip U, the DIS of the other end and control chip U Pin is connected.The N poles of diode D2 are connected after resistance R2 with the DIS pins of control chip U, P poles ground connection.Diode D1 P poles be connected with the DIS pins of control chip U, N poles are connected after adjustable resistance R3 with the P poles of diode D2.Capacitance C1 Adjustable side of the wherein one end with adjustable resistance R3 after adjustable resistance R4 be connected, other end ground connection.The control chip U's T pins are connected with the adjustable side of adjustable resistance R4.
Wherein, the resistance R1 be diode D1 forward resistance, resistance R1=resistance R2=1k Ω；The adjustable electric Resistance R3 ＞ resistance R1 and resistance R2, and adjustable resistance R3=10M, and auxiliary resistances of the adjustable resistance R4 as adjustable resistance R3, Its resistance value should be less than the resistance value of adjustable resistance R3, and the resistance value that employs of adjustable resistance R4 is realized for the potentiometer of 1M；Its capacitance Energy-storage travelling wave tubes of the C1 as this circuit, capacitance are then preferentially set as 0.1 μ F.
Further, the three collection tube drive circuit includes three collector Q1, three collector Q2, resistance R5, resistance R6, resistance R7, polar capacitor C2, and diode D3.
During connection, one end of resistance R5 is connected with the base stage of three collector Q2, the F pin phases of the other end and control chip U Connection.The P poles of diode D3 are connected with the F pins of control chip U, emitter phase of the N poles after resistance R6 with three collector Q2 Connection.The cathode of polar capacitor C2 is connected with the collector of three collector Q1, and anode is connected with the N poles of diode D3.Resistance One end of R7 is connected with the anode of polar capacitor C2, and the other end is connected with the GND pins of control chip U.
The emitter of the three collectors Q1 is connected with the R pins of control chip U, base stage and three collectors of three collector Q1 The collector of Q2 is connected；The N poles ground connection of the diode D3；The collector of the three collectors Q1 after resistance R8 with triode The collector of Q3 is connected, and the emitter of the GND pins of the control chip U with triode Q3 after resistance R10 is connected.
Three collector Q1 in the present embodiment employ the amplifier tube of model 3AX81 to realize, and three collector Q2 are then preferential Employ 3DG12；Meanwhile the resistance value of resistance R5 is set as 4.7k Ω, the resistance value of resistance R6 is set as 47k Ω, resistance R7 conducts Shut off resistance, its resistance value is set as 10k Ω；For polar capacitor C2 as triggering capacitor, it is 2200 μ F discharge and recharges of high capacitance Hold；Diode D3 then preferentially employs the switching tube of 1N4148.
Further, as shown in Figure 1, the overload protecting circuit includes triode Q3, resistance R8, resistance R9, resistance R10, inductance L1, polar capacitor C3, capacitance C4, and diode D4.
During connection, the anode of polar capacitor C3 is connected with the collector of triode Q3, cathode after inductance L1 with control The R pins of chip U are connected.One end of resistance R8 is connected with three collection tube drive circuits, the current collection of the other end and triode Q3 Pole is connected.
Meanwhile collector of the P poles of diode D4 with triode Q3 after resistance R9 is connected, N poles are with triode Q3's Emitter is grounded after being connected.Wherein one end of capacitance C4 is connected with the base stage of triode Q3, and the other end is with triode Q3's Collector is connected.One end of resistance R10 is connected with the emitter of triode Q3, and the collector of the other end and triode Q3 is total to With the output terminal for forming overload protecting circuit.During implementation, capacitance C4 and resistance R10 are connected with motor respectively.
Triode Q3 in the present embodiment preferentially employs 3DG12；The resistance value of resistance R8 is set as 4.7k Ω, resistance R9's Resistance value is set as 4k Ω, and the resistance value of resistance R10 is set as 1k Ω；The inductance value of inductance L1 is set as 50 μ H；Polar capacitor C3's Capacitance is set as 2.2 μ F, and the capacitance of capacitance C4 is set as that 22 μ F, diode D4 then preferentially employ 1N4018 to realize.Wherein, Resistance R9 and resistance R10 are as sample resistance.
Operationally, when the load of motor increases, resistance R9 and resistance R10 start to be depressured the circuit, the electricity of inductance L1 Position declines, triode Q3 conductings, and the F pins output of control chip U is that 0V, triode Q1 and triode Q2 are turned off, motor Voltage be turned off.When the load of motor reduces, the current potential of inductance L1 rises, and the F pins output of control chip U is 1V, Triode Q1 and triode Q2 are both turned on, and the voltage of motor is switched on, and motor keeps running well.So as to effectively prevent During the load increase of motor, puncture Q2 times of triode Q1 and triode, ensure that the reliable of the system work well Property.
During implementation, resistance R1, diode D1, adjustable resistance R3 and capacitance C1 and control in the pulse-width modulation circuit The UCC pins of chip U form the charge circuit of a pulse generation, and the charging interval of its charge circuit is t0, its t0=In2 (R1+D1+R3) C, and because of the forward resistance that resistance R1 is diode D1, the resistance value of resistance R1 is smaller, makes t0≈0.693(R1+ R2)C.After capacitance C1 completes to charge, the connecting pin of itself and adjustable resistance R4 is then cathode, capacitance C1 and with adjustable resistance R4 Resistance R2 diodes D2 forms electric discharge meeting road, turns on the discharge tube in control chip U, and DIS pins are grounded, therefore institute is at this time Discharge time be t1, its t1≈0.693(R4+R2)C.Therefore, the vibration week of control chip U is T, its T=t0+t1≈0.693 (R3+R4+R1+R2) C=0.693 (R3+R1+R2) C.
The resistance R1 be diode D1 forward resistance, resistance R1=resistance R2=1k Ω；The adjustable resistance R3 ＞ resistance R1 and resistance R2, and adjustable resistance R3=10M, therefore can obtain pulse duty factor is D, its D=t1÷ T=(R1+ R3)÷(R4+R1+R2).As R4=0, D=R1/ (R4+R1+R2) ≈ R1/R4=0.01%；As R3=0, R3 becomes R4, Pulse duty factor at this time is D=R1+R4/ (R4+R1+R2)=99.99%.Meanwhile adjustable resistance R3 and adjustable resistance R4 phases It can be realized after cooperation and pulse duty factor is continuously adjusted.
When the adjustable side of adjustable resistance R3 is slided to the left, pulse duty factor D reduces, i.e. the wide reduction of positive pulse, controls core The average value of piece U outputs diminishes, motor deceleration；When the adjustable side of adjustable resistance R3 is slided to the right, pulse duty factor D increases Greatly, i.e. the wide increase of positive pulse, the average value of control chip U outputs become larger, and motor accelerates.
R3 in its above-mentioned formula is adjustable resistance R3, and R4 is adjustable resistance R4, and R1 is resistance R1, and R2 is for resistance R2, C1 Capacitance C1, D1 are diode D2 for diode D1, D2.
During carrying out practically, when the F pins of control chip U be 1V it is high usually, three collector Q1 conductings, the base stage of three collector Q2 For low level, it is also turned on, makes energizing DC motor, motor accelerates；Meanwhile polar capacitor C2 is started to charge up.Work as control When the F pins of chip U are 0V low levels, three collector Q1 cut-offs, three collector Q2 are also switched off, the power supply of dc motor are cut at the same time Disconnected, dc motor is by the energy storage rotation of coherence and polar capacitor C2, dc motor deceleration at this time.
As described above, the present invention can be realized well.

Claims (6)

1. a kind of DC motor speed-regulating system with overload protection function, it is characterised in that including control chip U, difference The pulse-width modulation circuit being connected with the UCC pins and DIS pins and T pins of control chip U, respectively with the R of control chip U The three collection tube drive circuits that pin is connected with F pins and GND pins, and collect respectively with the R pins of control chip U and three The overload protecting circuit that tube drive circuit is connected；The GND pins ground connection of the control chip U.
A kind of 2. DC motor speed-regulating system with overload protection function according to claim 1, it is characterised in that： The overload protecting circuit includes triode Q3, anode is connected with the collector of triode Q3, cathode after inductance L1 with control The polar capacitor C3 that the R pins of coremaking piece U are connected, one end is connected with three collection tube drive circuits, the other end and triode Q3 Resistance R8, the P pole that is connected of collector be connected after resistance R9 with the collector of triode Q3, N poles are with triode Q3's The diode D4 that emitter is grounded after being connected, wherein one end are connected with the base stage of triode Q3, the other end and triode Q3 The capacitance C4 that is connected of collector, and one end is connected with the emitter of triode Q3, the collection of the other end and triode Q3 Electrode is collectively forming the resistance R10 of the output terminal of overload protecting circuit.
A kind of 3. DC motor speed-regulating system with overload protection function according to claim 2, it is characterised in that： The pulse-width modulation circuit include one end be connected with the UCC pins of control chip U, the DIS pins of the other end and control chip U Resistance R1, the N pole being connected is connected after resistance R2 with the DIS pins of control chip U, diode D2, the P poles of P poles ground connection It is connected with the DIS pins of control chip U, the diode D1 that N poles are connected after adjustable resistance R3 with the P poles of diode D2, And the capacitance C1 that wherein one end is connected after adjustable resistance R4 with the adjustable side of adjustable resistance R3, the other end is grounded；It is described The T pins of control chip U are connected with the adjustable side of adjustable resistance R4.
A kind of 4. DC motor speed-regulating system with overload protection function according to claim 3, it is characterised in that： The three collection tube drive circuit includes three collector Q1, three collector Q2, and one end is connected with the base stage of three collector Q2, the other end and control Resistance R5, the P pole that the F pins of coremaking piece U are connected is connected with the F pins of control chip U, N poles collect after resistance R6 with three The diode D3 that the emitter of pipe Q2 is connected, cathode is connected with the collector of three collector Q1, the N poles of anode and diode D3 The polar capacitor C2 being connected, and one end is connected with the anode of polar capacitor C2, the GND of the other end and control chip U are managed The resistance R7 that foot is connected；The emitter of the three collectors Q1 is connected with the R pins of control chip U, the base of three collector Q1 Pole is connected with the collector of three collector Q2；The N poles ground connection of the diode D3；The collector of the three collectors Q1 is through resistance R8 The collector with triode Q3 is connected afterwards, the transmitting of the GND pins of the control chip U after resistance R10 with triode Q3 Pole is connected.
A kind of 5. DC motor speed-regulating system with overload protection function according to claim 4, it is characterised in that： The resistance R1 be diode D1 forward resistance, resistance R1=resistance R2=1k Ω；The adjustable resistance R3 ＞ resistance R1 With resistance R2, and adjustable resistance R3=10M.
A kind of 6. DC motor speed-regulating system with overload protection function according to claim 5, it is characterised in that： The control chip U is NE555 integrated chips.
CN201810004161.6A 2018-01-03 2018-01-03 A kind of DC motor speed-regulating system with overload protection function Pending CN107947654A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201810004161.6A CN107947654A (en) 2018-01-03 2018-01-03 A kind of DC motor speed-regulating system with overload protection function

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201810004161.6A CN107947654A (en) 2018-01-03 2018-01-03 A kind of DC motor speed-regulating system with overload protection function

Publications (1)

Publication Number Publication Date
CN107947654A true CN107947654A (en) 2018-04-20

Family

ID=61937389

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201810004161.6A Pending CN107947654A (en) 2018-01-03 2018-01-03 A kind of DC motor speed-regulating system with overload protection function

Country Status (1)

Country Link
CN (1) CN107947654A (en)

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Application publication date: 20180420

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