CN104201939A - Control system of AC (alternate current) motor - Google Patents
Control system of AC (alternate current) motor Download PDFInfo
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- CN104201939A CN104201939A CN201410408276.3A CN201410408276A CN104201939A CN 104201939 A CN104201939 A CN 104201939A CN 201410408276 A CN201410408276 A CN 201410408276A CN 104201939 A CN104201939 A CN 104201939A
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Abstract
The invention discloses a control system of an AC motor. The control system of the AC motor comprises a power conversion module, an overheating and overcurrent protection switch, a zero-passage signal detecting module, a relay control module, a silicon-controlled module and a master control module. The master control module firstly switches on the relay control module at a power supply zero point, and due to the fact that no voltage exists between both ends of a relay in the relay control module at the moment, the relay can avoid sparking; the master control module can perform time delay treatment when detecting the power supply zero point to switch on the silicon-controlled module and to start the motor; if the motor needs to be stopped, the master control module can firstly control the silicon-controlled module to stop working to cut off the live wire circuit of the motor, and then stop the working of the relay control module, at the moment, high voltages at both ends of the relay can be cut off, and meanwhile, sparking during the cut-off moment can also be avoided; the relay control module and the silicon-controlled control module together controls the starting operation of the motor to avoid spurious triggering.
Description
Technical field
The present invention relates to motor control technique, be specifically related to a kind of control system of alternating current motor.
Background technology
Alternating current motor is the machinery of mutually changing for realizing mechanical energy and AC energy, and alternating current motor application is in the market very extensive, stirs electric appliances (such as food cooking machine), and on some electric tools, all have use at some.
The control mode of alternating current motor comprises: 1, by the current supply circuit of single channel SCR control motor, regulate, control the voltage of supply motor; 2, by the current supply circuit of single channel Control motor, cut off and supply motor electric current.
But there are some shortcomings in above-mentioned motor control technique: the first is single channel SCR control, is vulnerable to electrical network interference effect and causes false triggering, makes motor misoperation under abnormal condition, causes the injury to people; The second is single channel Control, in the control procedure of large capacity motor, at appliance starting and turn-off transient, easily causes " sparking " phenomenon, serious can fire hazard, cause consumer's economic loss, even threaten life safety.
The control main points of alternating current motor are mainly to eliminate in heavy-current control process, the spike occurring in the process opening and closing due to motor inductive load makes control device, such as sparking, the phenomenon misleading appear in relay, controllable silicon, if got rid of these disturbing factors, just can well control alternating current motor well, use alternating current motor that also just more can be handy.
Summary of the invention
In view of above-mentioned the deficiencies in the prior art part, the object of the present invention is to provide a kind of control system of alternating current motor, can avoid motor in startup and closing process, to occur the phenomenon of sparking and false triggering.
In order to achieve the above object, the present invention has taked following technical scheme:
A control system for alternating current motor, comprising: overheated overcurrent protective switch, zero cross signal detection module, relay control module, Thyristor Control Module and main control module; When needs starter, by main control module, for electrical zero place, first opening relay control module, then Time Delay Opening Thyristor Control Module makes motor starting; If need motor to quit work, by main control module, first control Thyristor Control Module and quit work and cut off the live wire loop of motor, then the work of slew relay control module.
The control system of described alternating current motor, also comprises:
For alternating current being converted to the power conversion module of powered by direct current;
Sense switch for detection of the installment state of working equipment;
For shield zero cross signal when sense switch disconnects, make the out-of-work zero cross signal control module of motor;
One end of described sense switch connects power conversion module, and the other end of sense switch connects the 4th end of relay control module, also by zero cross signal control module, connects the 2nd end of zero cross signal detection module and the 1st end of main control module.
In the control system of described alternating current motor, described power conversion module comprises:
For the power filter unit that civil power is carried out to filtering processing;
For by be converted to-24V of the alternating current ,+17V of power filter unit output and+5V gives respectively the RC pressure unit of relay control module, Thyristor Control Module and main control module power supply;
The input of described power filter unit connects attaching plug, the positive pole of the output connecting motor of described power filter unit and the input of RC pressure unit, the output of RC pressure unit connects relay control module, Thyristor Control Module and main control module.
In the control system of described alternating current motor, described Thyristor Control Module comprises controllable silicon, the first triode, the second triode, the first electric capacity, the first resistance, the second resistance and the 3rd resistance, described silicon controlled the 1st end connects RC pressure unit+17V voltage output end, silicon controlled the 2nd end connects the 2nd end of relay control module, also by the first electric capacity, be connected with the first resistance successively described RC pressure unit+17V voltage output end, silicon controlled the 3rd end connects the emitter of the first triode, the base stage of the first triode connects the collector electrode of the second triode by the second resistance, the collector electrode of the first triode connects RC pressure unit+5V voltage output end, the grounded emitter of the second triode, the base stage of the second triode connects the 2nd end of main control module by the 3rd resistance.
In the control system of described alternating current motor, described relay control module comprises relay, the first diode, the 3rd triode, the 4th triode, the 4th resistance, the 5th resistance and the second electric capacity, the emitter of described the 4th triode connects one end of sense switch, the base stage of the 4th triode connects the 3rd end of main control module and one end of the second electric capacity by the 5th resistance, the other end ground connection of described the second electric capacity, the collector electrode of described the 4th triode connects the base stage of the 3rd triode by the 4th resistance, the emitter of described the 3rd triode connects RC pressure unit-24V voltage output end, the collector electrode of described the 3rd triode connects one end of the positive pole of the first diode and the coil of relay, the equal ground connection of the other end of the negative pole of the first diode and the coil of relay, the negative pole of one end connecting motor of the normally opened contact of described relay, the other end of the normally opened contact of described relay connects Thyristor Control Module.
In the control system of described alternating current motor, described zero cross signal detection module comprises the 5th triode, the second diode, the 3rd diode, the 3rd electric capacity, the 6th resistance, the 7th resistance, the 8th resistance and the 9th resistance; One end that the positive pole of the negative pole connecting motor of described the second diode is connected with overheated overcurrent protective switch; the positive pole of the second diode is connected the base stage of positive pole and the 5th triode of the 3rd diode by the 6th resistance successively with the 7th resistance; the emitter of the negative pole of described the 3rd diode and the 5th triode is connected described RC pressure unit+17V voltage output end, the collector electrode of the 5th triode by the 8th resistance connect the 1st end of main control module, also by the 9th grounding through resistance, also by the 3rd capacity earth.
In the control system of described alternating current motor, described zero cross signal control module comprises the 6th triode, the tenth resistance, the 11 resistance, the 4th diode, the 5th diode and the 4th electric capacity; The positive pole of described the 5th diode connects the other end of described sense switch, the negative pole of the 5th diode by the 11 grounding through resistance, also by the 4th capacity earth, also by the tenth resistance, connect the base stage of the 6th triode, the emitter of described the 6th triode connects the negative pole of the 4th diode, the collector electrode of the 6th triode connects the 1st end of main control module, also by the 8th resistance, connects the collector electrode of the 5th triode, the positive pole connection RC pressure unit of the 4th diode+5V voltage output end.
In the control system of described alternating current motor, described main control module comprises control chip, the 5th electric capacity and the 12 resistance, the PA1/AN1/VREF end of described control chip connects the collector electrode of the 5th triode by the 8th resistance, the PA2/AN2 end of described control chip connects the base stage of the second triode by the 3rd resistance, the PA3/INT0/AN3 end of described control chip connects the base stage of the 4th triode by described the 5th resistance, the PA7 end of described control chip passes through one end of the 12 resistance connection RC pressure unit+5V voltage output end and the 5th electric capacity, the other end ground connection of described the 5th electric capacity.
The control system of described alternating current motor, also comprises: user's Operation display module, described user's Operation display module comprises the first button, the second button, the 3rd button, the 4th button, a LED, the 2nd LED, the 3rd LED, the 4th LED, charactron, the 13 resistance, the 14 resistance, the 15 resistance, the 16 resistance, the 17 resistance, the 18 resistance, the 19 resistance, the 20 resistance, the 21 resistance, the 22 resistance and the 23 resistance, the PA4 end of described control chip is held with the PA0/AN0 that the first button is connected control chip by the 13 resistance successively, also by the 21 resistance, connect the 3rd end of charactron, the PB5 end of described control chip is held with the PA0/AN0 that the second button is connected control chip by the 14 resistance successively, also by the 20 resistance, connect the 1st end of charactron and the positive pole of a LED, the PB4 end of described control chip is held with the PA0/AN0 that the 3rd button is connected control chip by the 15 resistance successively, also by the 23 resistance, connect the 9th end of charactron, the PB3 end of described control chip is held with the PA0/AN0 that the 4th button is connected control chip by the 16 resistance successively, also by the 22 resistance, connect the 8th end of charactron, the PB0 end of described control chip connects the 4th end of charactron and the positive pole of the 2nd LED by the 19 resistance, the PB1 end of described control chip connects the 6th end of charactron and the positive pole of the 3rd LED by the 18 resistance, the PB2 end of described control chip connects the 7th end of charactron and the positive pole of the 4th LED by the 17 resistance, the negative pole of a described LED, the negative pole of the 2nd LED, the negative pole of the negative pole of the 3rd LED and the 4th LED is connected the PA7 end of control chip, the 5th end of described charactron connects the PA6/OSC1 end of control chip, the 10th end of described charactron connects the PA7/OSC2 end of control chip.
In the control system of described alternating current motor, power filter unit comprises piezo-resistance and the 6th electric capacity, and described RC pressure unit comprises the 24 resistance, the 25 resistance, the 6th diode, the 7th diode, the first voltage stabilizing didoe, the second voltage stabilizing two pipes, the 3rd voltage stabilizing didoe, the 7th electric capacity, the 8th electric capacity, the 9th electric capacity, the tenth electric capacity and the 11 electric capacity, one end of described piezo-resistance connects the live wire of attaching plug, the other end of piezo-resistance connects the zero line of attaching plug, one end of described the 6th electric capacity connects the live wire of attaching plug, one end of piezo-resistance and the positive pole of motor, also by the 24 resistance, connect one end of the 7th electric capacity, the other end of described the 6th electric capacity connects the zero line of attaching plug, the other end of described the 7th electric capacity connects the negative pole of the 6th diode and the negative pole of the 7th diode, described the 25 resistance is connected in parallel on the two ends of the 7th electric capacity, the positive pole of described the 7th diode connects the zero line of attaching plug, the positive pole of described the 6th diode connects the zero line of attaching plug by the 8th electric capacity, the one end that also connects positive pole and the 9th electric capacity of the first voltage stabilizing didoe, the other end ground connection of the negative pole of described the first voltage stabilizing didoe and the 9th electric capacity, one end of described the 9th electric capacity is RC pressure unit-24V voltage output end, one end ground connection of the positive pole of described the second voltage stabilizing didoe and the tenth electric capacity, the negative pole of the second voltage stabilizing didoe connects positive pole, the tenth other end of electric capacity and one end of the 11 electric capacity of the 3rd voltage stabilizing didoe, the other end of described the tenth electric capacity be RC pressure unit+5V voltage output end, the negative pole of described the 3rd voltage stabilizing didoe connects the other end of the 11 electric capacity, the other end of described the 11 electric capacity be RC pressure unit+17V voltage output end.
Compared to prior art, the control system of alternating current motor provided by the invention, when needs starter, first by zero cross signal detection module, detected for electrical zero, by main control module, first opening relay control module for electrical zero place, because relay control module repeat circuit two ends now do not have high pressure, so relay does not exist the phenomenon of sparking, and when detecting for electrical zero, do delay process, open Thyristor Control Module and make motor starting; If need motor to quit work, main control module is first controlled Thyristor Control Module and is quit work, first cut off the live wire loop of motor, the work of slew relay control module again, now the forceful electric power at relay two ends is cut off, so relay does not exist the phenomenon of sparking in the moment disconnecting yet, and controls motor unlatching work by relay control module and Thyristor Control Module simultaneously, can not produce false triggering, safe.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of the control system of alternating current motor of the present invention.
Fig. 2 is the circuit theory diagrams of the control system of alternating current motor of the present invention.
Embodiment
In the control procedure of alternating current motor electrical equipment, often require motor with different power and rotary speed working, so require motor, should accomplish that spark phenomenon can not appear in control relay, accomplish again to control with light current the power of forceful electric power device governor motor, the invention provides a kind of control system of alternating current motor for this reason, by use relay and SCR control alternating current motor simultaneously, thus the spark phenomenon that can avoid relay to occur, the object that can accomplish again regulating power and rotating speed.
For making object of the present invention, technical scheme and effect clearer, clear and definite, referring to accompanying drawing, developing simultaneously, the present invention is described in more detail for embodiment.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
Refer to Fig. 1, the control system of alternating current motor provided by the invention comprises: power conversion module 10, overheated overcurrent protective switch S1, zero cross signal detection module 20, relay control module 30, Thyristor Control Module 40 and main control module 50, described power conversion module 10 is by the positive pole of overheated overcurrent protective switch S1 connecting motor and the 1st end of zero cross signal detection module 20, and the negative pole of described motor connects the 1st end of relay control module 30; The 2nd end of described zero cross signal detection module 20 connects main control module 50 the 1st end; The 2nd end of described main control module 50 connects the 2nd end of relay control module 30 by Thyristor Control Module 40, the 3rd end of described main control module 50 connects the 3rd end of relay control module 30.
Wherein, described power conversion module 10 provides work required voltage for alternating current being converted to direct current for above-mentioned modules.Described overheated overcurrent protective switch S1 is used for carrying out overheated overcurrent protection, and when overcurrent overheat, the supply access of motor live wire is turn-offed in switch motion.Described zero cross signal detection module 20, for detection of zero cross signal, detects for electrical zero to master controller.Described relay control module 30 is for controlling the operating state of motor, revolution during relay adhesive in relay control module 30, and during disconnection, motor stops operating.Described Thyristor Control Module 40 is for the operating state of control relay control module 30.
Described main control module 50 is opened relay control module 30 when having zero cross signal, and delayed start-up Thyristor Control Module 40 makes motor operations, and motor operations need be stopped time, turn-off Thyristor Control Module 40 time delayed turn-off relay control module 30.Be that main control module 50 is first being opened relay control module 30 for electrical zero place, due to Thyristor Control Module 40 now, relay control module 30 repeat circuit two ends do not have high pressure, so there is not the phenomenon of sparking in relay, and do delay process for electrical zero detecting, open Thyristor Control Module 40 and make motor starting; If need motor to quit work, the first Thyristor Control Module 40 of main control module 50 quits work, first cut off the live wire loop of motor, the work of slew relay control module 30 again, now the forceful electric power at relay R EL1 two ends is cut off, thus in the moment disconnecting, there is not the phenomenon of sparking yet, and control motor unlatching work by relay control module 30 and Thyristor Control Module 40 simultaneously, can not produce false triggering, safe.
Please continue to refer to Fig. 1, the control system of alternating current motor of the present invention also comprises: sense switch S2 and zero cross signal control module 60, one end of described sense switch S2 connects power conversion module 10, by power conversion module 10, powers to sense switch S2.The other end of described sense switch S2 connects the 4th end of relay control module 30, also by zero cross signal control module 60, connects the 2nd end of zero cross signal detection module 20 and the 1st end of main control module 50.
Described sense switch S2, for detection of the installment state of working equipment, while being food cooking machine as working equipment, checks whether container is arranged on base, and when container installs, sense switch S2 is closed, and when container is not installed, sense switch S2 disconnects.Described zero cross signal control module 60 quits work motor for shield zero cross signal when sense switch S2 disconnects, when container is not installed, the zero cross signal that zero cross signal control module 60 shielding zero cross signal detection modules 20 detect, make main control module 50 control Thyristor Control Module 40 and do not work, finally make motor not work.
In the present embodiment, described power conversion module 10 comprises: power filter unit 101 and RC pressure unit 102, the input of described power filter unit 101 connects attaching plug, the positive pole of the output connecting motor of described power filter unit 101 and the input of RC pressure unit 102, the output of RC pressure unit 102 connects relay control module 30, Thyristor Control Module 40 and main control module 50.
Wherein, described power filter unit 101 is for civil power is carried out to filtering processing, RC pressure unit 102 for by be converted to-24V of the alternating current ,+17V of 101 outputs of power filter unit and+5V gives respectively relay control module 30, Thyristor Control Module 40 and main control module 50 power supplies.
See also Fig. 2, while specifically implementing, described Thyristor Control Module 40 comprises controllable silicon T1, the first triode Q1, the second triode Q2, the first capacitor C 1, the first resistance R 1, the second resistance R 2 and the 3rd resistance R 3.The 1st end of described controllable silicon T1 connects RC pressure unit 102+17V voltage output end, the 2nd end of controllable silicon T1 connects the 2nd end of relay control module 30, also successively by the first capacitor C 1 be connected with the first resistance R 1 described RC pressure unit 102+17V voltage output end, the 3rd end of controllable silicon T1 connects the emitter of the first triode Q1, the base stage of the first triode Q1 connects the collector electrode of the second triode Q2 by the second resistance R 2, the collector electrode of the first triode Q1 connects RC pressure unit 102+5V voltage output end, the grounded emitter of the second triode Q2, the base stage of the second triode Q2 connects the 2nd end of main control module 50 by the 3rd resistance R 3.
Wherein, described the first triode Q1 is PNP triode, the second triode Q2 is NPN triode, when the 2nd end of main control module 50 is exported high level, described the first triode Q1 and the equal conducting of the second triode Q2, the 3rd end that this Continuity signal adds to controllable silicon T1 makes controllable silicon T1 conducting, 30 work of control relay control module; When the 2nd end output low level of main control module 50, described the first triode Q1 and the second triode Q2 all end, and the 3rd end of controllable silicon T1 does not have signal, controllable silicon T1 is not worked, thereby control relay control module 30 is not worked.
Certainly in other embodiment, the PNP triode in Thyristor Control Module 40 also can adopt the circuit of P metal-oxide-semiconductor or NPN triode and inverter formation, or other switching device replaces; Corresponding NPN triode also can be done similar conversion, and the present invention is not restricted this.
Please continue to refer to Fig. 1 and Fig. 2, described relay control module 30 comprises relay R EL1, the first diode D1, the 3rd triode Q3, the 4th triode Q4, the 4th resistance R 4, the 5th resistance R 5 and the second capacitor C 2, the emitter of described the 4th triode Q4 connects one end of sense switch S2, the base stage of the 4th triode Q4 connects the 3rd end of main control module 50 and one end of the second capacitor C 2 by the 5th resistance R 5, the other end ground connection of described the second capacitor C 2, the collector electrode of described the 4th triode Q4 connects the base stage of the 3rd triode Q3 by the 4th resistance R 4, the emitter of described the 3rd triode Q3 connects RC pressure unit 102-24V voltage output end, the collector electrode of described the 3rd triode Q3 connects one end of the positive pole of the first diode D1 and the coil KM of relay R EL1, the equal ground connection of the other end of the coil KM of the negative pole of the first diode D1 and relay R EL1, the negative pole of one end connecting motor of the normally opened contact K of described relay R EL1, the other end of the normally opened contact K of described relay R EL1 connects Thyristor Control Module 40.
Wherein, described the 3rd triode Q3 is NPN triode, the 4th triode Q4 is PNP triode, when sense switch S2 disconnects, the 4th triode Q4 cut-off, the 3rd triode Q3 also end, when sense switch S2 is closed, very high level, base stage are that low level makes the 4th triode Q4 conducting in the transmitting of (while installing as container) the 4th triode Q4, now the 3rd triode Q3 also conducting to relay R EL1, power, if also conducting of controllable silicon T1, to make the normally opened contact adhesive of relay R EL1, thereby make motor operations.
Certainly, in other embodiments, the circuit that the PNP triode in relay control module 30 also can adopt P metal-oxide-semiconductor or NPN triode and inverter to form, or other switching device replaces; Corresponding NPN triode also can be done similar conversion, and the present invention is not restricted this.
Please continue to refer to Fig. 1 and Fig. 2, described zero cross signal detection module 20 comprises the 5th triode Q5, the second diode D2, the 3rd diode D3, the 3rd capacitor C 3, the 6th resistance R 6, the 7th resistance R 7, the 8th resistance R 8 and the 9th resistance R 9.One end that the positive pole of the negative pole connecting motor of described the second diode D2 is connected with overheated overcurrent protective switch S1; the positive pole of the second diode D2 is connected the base stage of positive pole and the 5th triode Q5 of the 3rd diode D3 by the 6th resistance R 6 successively with the 7th resistance R 7; the emitter of the negative pole of described the 3rd diode D3 and the 5th triode Q5 is connected described RC pressure unit 102+17V voltage output end, the collector electrode of the 5th triode Q5 by the 8th resistance R 8 connect the 1st end of main control modules 50, also by the 9th resistance R 9 ground connection, also by the 3rd capacitor C 3 ground connection.
Wherein, described the 5th triode Q5 is PNP triode, and when power supply zero passage being detected, described the 5th triode Q5 conducting, to main control module 50 feedback zero cross signals.Certainly in other embodiment, the PNP triode in zero cross signal detection module 20 also can adopt the circuit of P metal-oxide-semiconductor or NPN triode and inverter formation, or other switching device replaces; Corresponding NPN triode also can be done similar conversion, and the present invention is not restricted this.
Further, described zero cross signal control module 60 comprises the 6th triode Q6, the tenth resistance R the 10, the 11 resistance R 11, the 4th diode D4, the 5th diode D2 and the 4th capacitor C 4.The positive pole of described the 5th diode D2 connects the other end of described sense switch S2, the negative pole of the 5th diode D2 by the 11 resistance R 11 ground connection, also by the 4th capacitor C 4 ground connection, also by the tenth resistance R 10, connect the base stage of the 6th triode Q6, the emitter of described the 6th triode Q6 connects the negative pole of the 4th diode D4, the collector electrode of the 6th triode Q6 connects the 1st end of main control module 50, also by the 8th resistance R 8, connects the collector electrode of the 5th triode Q5, the positive pole connection RC pressure unit 102 of the 4th diode D4+5V voltage output end.
Described the 6th triode Q6 is PNP triode, when sense switch S2 disconnects, the base stage of described the 6th triode Q6 is low level, make the 6th triode Q6 conducting, now can shield the zero cross signal that zero cross signal detection module 20 detects, when sense switch S2 is closed, the 6th triode Q6 cut-off, can not shield zero cross signal.After container installs, can not shield zero cross signal, make zero cross signal feed back to main control module 50, thereby control Thyristor Control Module 40 in the applicable time action for after electrical zero.Certainly in other embodiment, the PNP triode in this circuit also can adopt the circuit of P metal-oxide-semiconductor or NPN triode and inverter formation, or other switching device replacement, and the present invention is not restricted this.
In the present embodiment, described main control module 50 comprises control chip U1, the 5th capacitor C 5 and the 12 resistance R 12, the PA1/AN1/VREF end of described control chip U1 connects the collector electrode of the 5th triode Q5 by the 8th resistance R 8, the PA2/AN2 end of described control chip U1 connects the base stage of the second triode Q2 by the 3rd resistance R 3, the PA3/INT0/AN3 end of described control chip U1 connects the base stage of the 4th triode Q4 by described the 5th resistance R 5, the PA7 end of described control chip U1 passes through one end of the 12 resistance R 12 connection RC pressure units 102+5V voltage output end and the 5th capacitor C 5, the other end ground connection of described the 5th capacitor C 5.
The control system of alternating current motor of the present invention also can be carried out human-machine operation, it comprises user's Operation display module 70, as depicted in figs. 1 and 2, it comprises the first button KW1, the second button KW2, the 3rd button KW3, the 4th button KW4, the one LED, the 2nd LED D2 ', the 3rd LED D3 ', the 4th LED D4 ', charactron D5 ', the 13 resistance R 13, the 14 resistance R 14, the 15 resistance R 15, the 16 resistance R 16, the 17 resistance R 17, the 18 resistance R 18, the 19 resistance R 19, the 20 resistance R 20, the 21 resistance R 21, the 22 resistance R 22 and the 23 resistance R 23.
The PA4 end of described control chip U1 is held with the PA0/AN0 that the first button KW1 is connected control chip U1 by the 13 resistance R 13 successively, also by the 21 resistance R 21, connect the 3rd end of charactron D5 ', the PB5 end of described control chip U1 is held with the PA0/AN0 that the second button KW2 is connected control chip U1 by the 14 resistance R 14 successively, also by the 20 resistance R 20, connect the 1st end of charactron D5 ' and the positive pole of a LED, the PB4 end of described control chip U1 is held with the PA0/AN0 that the 3rd button KW3 is connected control chip U1 by the 15 resistance R 15 successively, also by the 23 resistance R 23, connect the 9th end of charactron D5 ', the PB3 end of described control chip U1 is held with the PA0/AN0 that the 4th button KW4 is connected control chip U1 by the 16 resistance R 16 successively, also by the 22 resistance R 22, connect the 8th end of charactron D5 ', the PB0 end of described control chip U1 connects the 4th end of charactron D5 ' and the positive pole of the 2nd LED D2 ' by the 19 resistance R 19, the PB1 end of described control chip U1 connects the 6th end of charactron D5 ' and the positive pole of the 3rd LED D3 ' by the 18 resistance R 18, the PB2 end of described control chip U1 connects the 7th end of charactron D5 ' and the positive pole of the 4th LED D4 ' by the 17 resistance R 17, the negative pole of a described LED, the negative pole of the 2nd LED D2 ', the negative pole of the negative pole of the 3rd LED D3 ' and the 4th LED D4 ' is connected the PA7 end of control chip U1, the 5th end of described charactron D5 ' connects the PA6/OSC1 end of control chip U1, the 10th end of described charactron D5 ' connects the PA7/OSC2 end of control chip U1.
When having button to press, control chip U1 is by carrying out key scan to I/O mouth (as PA4 end-PB3 end), detect corresponding button and press, then realize corresponding function, control chip U1 realizes the demonstration of state and operating time by controlling charactron D5 ' and LED lamp.
Another important improvement part of the present invention is the supply power mode of modules to improve, as depicted in figs. 1 and 2, described power filter unit 101 comprises piezo-resistance MOV1 and the 6th capacitor C 6, and described RC pressure unit 102 comprises the 24 resistance R the 24, the 25 resistance R 25, the 6th diode D6, the 7th diode D7, the first voltage stabilizing didoe ZD1, the second voltage stabilizing two pipe ZD2, the 3rd voltage stabilizing didoe ZD3, the 7th capacitor C 7, the 8th capacitor C 8, the 9th capacitor C 9, the tenth capacitor C 10 and the 11 capacitor C 11.
Wherein, one end of described piezo-resistance MOV1 connects the live wire of attaching plug J1, the other end of piezo-resistance MOV1 connects the zero line of attaching plug J1, one end of described the 6th capacitor C 6 connects the live wire of attaching plug J1, one end of piezo-resistance MOV1 and the positive pole of motor, also by the 24 resistance R 24, connect one end of the 7th capacitor C 7, the other end of described the 6th capacitor C 6 connects the zero line of attaching plug J1, the other end of described the 7th capacitor C 7 connects the negative pole of the 6th diode D6 and the negative pole of the 7th diode D7, described the 25 resistance R 25 is connected in parallel on the two ends of the 7th capacitor C 7, the positive pole of described the 7th diode D7 connects the zero line of attaching plug J1, the positive pole of described the 6th diode D6 connects the zero line of attaching plug J1 by the 8th capacitor C 8, also connect the positive pole of the first voltage stabilizing didoe ZD1 and one end of the 9th capacitor C 9, the other end ground connection of the negative pole of described the first voltage stabilizing didoe ZD1 and the 9th capacitor C 9, one end of described the 9th capacitor C 9 is RC pressure unit 102-24V voltage output end, one end ground connection of the positive pole of described the second voltage stabilizing didoe ZD2 and the tenth capacitor C 10, the negative pole of the second voltage stabilizing didoe ZD2 connects positive pole, the tenth other end of capacitor C 10 and one end of the 11 capacitor C 11 of the 3rd voltage stabilizing didoe ZD3, the other end of described the tenth capacitor C 10 be RC pressure unit 102+5V voltage output end, the negative pole of described the 3rd voltage stabilizing didoe ZD3 connects the other end of the 11 capacitor C 11, the other end of described the 11 capacitor C 11 be RC pressure unit 102+17V voltage output end.
In the present embodiment, described controllable silicon T1 and zero-power line conllinear, civil power is after RC pressure unit 102 step-down rectifiers are processed, obtain+17V of the voltage stabilizing circuit ,+5V forming by voltage stabilizing didoe and electric capacity and-voltage of 24V powers to respectively relay R EL1, controllable silicon and control chip U1, and make controllable silicon and zero-power line conllinear, be convenient to silicon controlled to control, avoid false triggering.
Below in conjunction with Fig. 2, with motor, in food cooking machine, use, control mode of the present invention is elaborated:
Civil power access by power filter enter RC pressure unit 102 generations+17V ,+5V and-voltage of 24V powers to relay R EL1, controllable silicon and control chip U1 respectively, and user interface shows holding state, now relay R EL1 and controllable silicon T1 all turn-off, and motor is not worked.
After control chip U1 detection startup button is pressed, judge that, when overheated overcurrent protective switch S1 is normal, the voltage of power firestreak passes in zero cross signal detection module 20 and produces zero cross signal through overheated overcurrent protective switch S1, and be transferred to control chip U1; When overheated overcurrent protective switch S1 is abnormal, there is no voltage transmission in zero cross signal detection module 20, therefore can not produce zero cross signal.
In zero cross signal detection module 20, due to+17V network is with zero-power line conllinear, and this partial circuit is actual is that the second diode D2, the 6th resistance R 6, the 7th resistance R 7 and these four components and parts of the 3rd diode D3 are linked between zero and live wire of power line.When power phase is that zero line is while being greater than live wire 0.7V, because the 5th triode Q5 is in parallel with the 3rd diode D3, make the 5th triode Q5 power taking conducting, now zero line is by the 5th triode Q5, after the 8th resistance R 8 and the 9th resistance R 9 dividing potential drops, be linked into the I/O mouth (being PA1/AN1/VREF end) of control chip U1, therefore the function of this zero cross signal detection module 20 is exactly to detect " 0 " some position of power supply zero live wire, after " 0 " point, and power phase is that zero line is while being greater than live wire 0.7V, to control chip U1 feedback zero cross signal, make control chip U1 export corresponding control signal and control silicon controlled operating state.
When zero passage detection is normal, whether the container that is detected food cooking machine by sense switch S2 installs, if container is not installed, sense switch S2 disconnects, the emitter of the 4th triode Q4 does not have voltage, can not drive relay R EL1, and simultaneously because sense switch S2 disconnects, to make its base stage be low level and conducting to the 6th triode Q6, shielding zero cross signal makes the PA1/AN1/VREF end of control chip U1 be set to high level, by software, judges controllable silicon and relay R EL1.When container installs, sense switch S2 is closed, the emitter of the 4th triode Q4 has 5V voltage to power to relay R EL1, the 6th triode Q6 cut-off simultaneously, zero cross signal is effective, when zero cross signal detection module 20 is after " 0 " point, adapt to time internal feedback zero cross signal time, control chip U1 makes Thyristor Control Module 40 work, thereby makes the normally opened contact adhesive of relay R EL1, makes motor operations.
In the circuit of Thyristor Control Module 40 and relay control module 30, zero-power line by controllable silicon T1 again series relay REL1 control motor, realize motor and by relay R EL1 and controllable silicon, reach the object of dual control.After powering on, start-up performance after user's selection key, control chip U1 accepts button and presses after signal, control the 4th triode Q4 conducting, relay R EL1 is powered on, by control chip U1, control the second triode Q2 after input ac power " 0 " point again, be selected in the suitable time to open, the zero line of controlling motor is connected and is made revolution.
The present invention opens by control relay REL1 and silicon controlled the problem that sequential avoids occurring motor sparking and controllable silicon false triggering:
When needs motor operations, control chip U1 first opens relay R EL1, and because controllable silicon T1 does not now have conducting, relay R EL1 two ends do not have high pressure, so relay R EL1 does not exist the phenomenon of sparking.Then be separated by other time of Millisecond, by zero cross signal detection module 20, detected for electrical zero, then do delay process (being the time that the zero line of power phase from zero point to power phase is greater than live wire 0.7V), thereby make control chip U1 open controllable silicon and realize soft start, soft start at each place's triggering at zero point controllable silicon of power supply, is realized silicon controlled full power operation later.In the whole course of work; relay R EL1 powers on when closing; controllable silicon T1 is not damaged by the 17 resistance R 17, the 5th resistance R 5 and the 4th capacitor C 4 protections, and the false triggering preventing by the 21 resistance R 21 and the 3rd capacitor C 3 filtering.
When needs motor quits work, control chip U1 first supplies with the triggering signal of controllable silicon T1, controllable silicon T1 is first quit work, cut off the live wire loop of motor, the work of slew relay REL1 more afterwards, now, the forceful electric power at relay R EL1 two ends is cut off, so also there is not the phenomenon of sparking in the moment disconnecting.
Certainly, of the present invention the control mode of motor is also not limited to this, in other embodiments, can take circuit design of the present invention as basis, design more mainly with controllable silicon and the combined alternating current motor control circuit of relay R EL1, such as two supply lines of alternating current motor adopt respectively relay R EL1 and controllable silicon to control simultaneously, or adopt the mode of controllable silicon and relay R EL1 combination to control etc., as long as can prevent spark phenomenon and false triggering.
In addition, the control system of alternating current motor of the present invention, the electronic component of use is few, cost is low, has guaranteed the security performance of electrical equipment, has promoted product quality.
Be understandable that, for those of ordinary skills, can be equal to replacement or change according to technical scheme of the present invention and inventive concept thereof, and all these changes or replacement all should belong to the protection range of the appended claim of the present invention.
Claims (10)
1. a control system for alternating current motor, is characterized in that, comprising: overheated overcurrent protective switch, zero cross signal detection module, relay control module, Thyristor Control Module and main control module; When needs starter, by main control module, for electrical zero place, first opening relay control module, then Time Delay Opening Thyristor Control Module makes motor starting; If need motor to quit work, by main control module, first control Thyristor Control Module and quit work and cut off the live wire loop of motor, then the work of slew relay control module.
2. the control system of alternating current motor according to claim 1, is characterized in that, also comprises:
For alternating current being converted to the power conversion module of powered by direct current;
Sense switch for detection of the installment state of working equipment;
For shield zero cross signal when sense switch disconnects, make the out-of-work zero cross signal control module of motor;
One end of described sense switch connects power conversion module, and the other end of sense switch connects the 4th end of relay control module, also by zero cross signal control module, connects the 2nd end of zero cross signal detection module and the 1st end of main control module.
3. the control system of alternating current motor according to claim 2, is characterized in that, described power conversion module comprises:
For the power filter unit that civil power is carried out to filtering processing;
For by be converted to-24V of the alternating current ,+17V of power filter unit output and+5V gives respectively the RC pressure unit of relay control module, Thyristor Control Module and main control module power supply;
The input of described power filter unit connects attaching plug, the positive pole of the output connecting motor of described power filter unit and the input of RC pressure unit, the output of RC pressure unit connects relay control module, Thyristor Control Module and main control module.
4. the control system of alternating current motor according to claim 3, is characterized in that, described Thyristor Control Module comprises controllable silicon, the first triode, the second triode, the first electric capacity, the first resistance, the second resistance and the 3rd resistance, described silicon controlled the 1st end connects RC pressure unit+17V voltage output end, silicon controlled the 2nd end connects the 2nd end of relay control module, also by the first electric capacity, be connected with the first resistance successively described RC pressure unit+17V voltage output end, silicon controlled the 3rd end connects the emitter of the first triode, the base stage of the first triode connects the collector electrode of the second triode by the second resistance, the collector electrode of the first triode connects RC pressure unit+5V voltage output end, the grounded emitter of the second triode, the base stage of the second triode connects the 2nd end of main control module by the 3rd resistance.
5. the control system of alternating current motor according to claim 4, is characterized in that, described relay control module comprises relay, the first diode, the 3rd triode, the 4th triode, the 4th resistance, the 5th resistance and the second electric capacity, the emitter of described the 4th triode connects one end of sense switch, the base stage of the 4th triode connects the 3rd end of main control module and one end of the second electric capacity by the 5th resistance, the other end ground connection of described the second electric capacity, the collector electrode of described the 4th triode connects the base stage of the 3rd triode by the 4th resistance, the emitter of described the 3rd triode connects RC pressure unit-24V voltage output end, the collector electrode of described the 3rd triode connects one end of the positive pole of the first diode and the coil of relay, the equal ground connection of the other end of the negative pole of the first diode and the coil of relay, the negative pole of one end connecting motor of the normally opened contact of described relay, the other end of the normally opened contact of described relay connects Thyristor Control Module.
6. the control system of alternating current motor according to claim 5, it is characterized in that, described zero cross signal detection module comprises the 5th triode, the second diode, the 3rd diode, the 3rd electric capacity, the 6th resistance, the 7th resistance, the 8th resistance and the 9th resistance; One end that the positive pole of the negative pole connecting motor of described the second diode is connected with overheated overcurrent protective switch; the positive pole of the second diode is connected the base stage of positive pole and the 5th triode of the 3rd diode by the 6th resistance successively with the 7th resistance; the emitter of the negative pole of described the 3rd diode and the 5th triode is connected described RC pressure unit+17V voltage output end, the collector electrode of the 5th triode by the 8th resistance connect the 1st end of main control module, also by the 9th grounding through resistance, also by the 3rd capacity earth.
7. the control system of alternating current motor according to claim 6, is characterized in that, described zero cross signal control module comprises the 6th triode, the tenth resistance, the 11 resistance, the 4th diode, the 5th diode and the 4th electric capacity; The positive pole of described the 5th diode connects the other end of described sense switch, the negative pole of the 5th diode by the 11 grounding through resistance, also by the 4th capacity earth, also by the tenth resistance, connect the base stage of the 6th triode, the emitter of described the 6th triode connects the negative pole of the 4th diode, the collector electrode of the 6th triode connects the 1st end of main control module, also by the 8th resistance, connects the collector electrode of the 5th triode, the positive pole connection RC pressure unit of the 4th diode+5V voltage output end.
8. the control system of alternating current motor according to claim 7, it is characterized in that, described main control module comprises control chip, the 5th electric capacity and the 12 resistance, the PA1/AN1/VREF end of described control chip connects the collector electrode of the 5th triode by the 8th resistance, the PA2/AN2 end of described control chip connects the base stage of the second triode by the 3rd resistance, the PA3/INT0/AN3 end of described control chip connects the base stage of the 4th triode by described the 5th resistance, the PA7 end of described control chip passes through one end of the 12 resistance connection RC pressure unit+5V voltage output end and the 5th electric capacity, the other end ground connection of described the 5th electric capacity.
9. the control system of alternating current motor according to claim 8, is characterized in that, also comprises: user's Operation display module, described user's Operation display module comprises the first button, the second button, the 3rd button, the 4th button, a LED, the 2nd LED, the 3rd LED, the 4th LED, charactron, the 13 resistance, the 14 resistance, the 15 resistance, the 16 resistance, the 17 resistance, the 18 resistance, the 19 resistance, the 20 resistance, the 21 resistance, the 22 resistance and the 23 resistance, the PA4 end of described control chip is held with the PA0/AN0 that the first button is connected control chip by the 13 resistance successively, also by the 21 resistance, connect the 3rd end of charactron, the PB5 end of described control chip is held with the PA0/AN0 that the second button is connected control chip by the 14 resistance successively, also by the 20 resistance, connect the 1st end of charactron and the positive pole of a LED, the PB4 end of described control chip is held with the PA0/AN0 that the 3rd button is connected control chip by the 15 resistance successively, also by the 23 resistance, connect the 9th end of charactron, the PB3 end of described control chip is held with the PA0/AN0 that the 4th button is connected control chip by the 16 resistance successively, also by the 22 resistance, connect the 8th end of charactron, the PB0 end of described control chip connects the 4th end of charactron and the positive pole of the 2nd LED by the 19 resistance, the PB1 end of described control chip connects the 6th end of charactron and the positive pole of the 3rd LED by the 18 resistance, the PB2 end of described control chip connects the 7th end of charactron and the positive pole of the 4th LED by the 17 resistance, the negative pole of a described LED, the negative pole of the 2nd LED, the negative pole of the negative pole of the 3rd LED and the 4th LED is connected the PA7 end of control chip, the 5th end of described charactron connects the PA6/OSC1 end of control chip, the 10th end of described charactron connects the PA7/OSC2 end of control chip.
10. the control system of alternating current motor according to claim 3, it is characterized in that, power filter unit comprises piezo-resistance and the 6th electric capacity, and described RC pressure unit comprises the 24 resistance, the 25 resistance, the 6th diode, the 7th diode, the first voltage stabilizing didoe, the second voltage stabilizing two pipes, the 3rd voltage stabilizing didoe, the 7th electric capacity, the 8th electric capacity, the 9th electric capacity, the tenth electric capacity and the 11 electric capacity, one end of described piezo-resistance connects the live wire of attaching plug, the other end of piezo-resistance connects the zero line of attaching plug, one end of described the 6th electric capacity connects the live wire of attaching plug, one end of piezo-resistance and the positive pole of motor, also by the 24 resistance, connect one end of the 7th electric capacity, the other end of described the 6th electric capacity connects the zero line of attaching plug, the other end of described the 7th electric capacity connects the negative pole of the 6th diode and the negative pole of the 7th diode, described the 25 resistance is connected in parallel on the two ends of the 7th electric capacity, the positive pole of described the 7th diode connects the zero line of attaching plug, the positive pole of described the 6th diode connects the zero line of attaching plug by the 8th electric capacity, the one end that also connects positive pole and the 9th electric capacity of the first voltage stabilizing didoe, the other end ground connection of the negative pole of described the first voltage stabilizing didoe and the 9th electric capacity, one end of described the 9th electric capacity is RC pressure unit-24V voltage output end, one end ground connection of the positive pole of described the second voltage stabilizing didoe and the tenth electric capacity, the negative pole of the second voltage stabilizing didoe connects positive pole, the tenth other end of electric capacity and one end of the 11 electric capacity of the 3rd voltage stabilizing didoe, the other end of described the tenth electric capacity be RC pressure unit+5V voltage output end, the negative pole of described the 3rd voltage stabilizing didoe connects the other end of the 11 electric capacity, the other end of described the 11 electric capacity be RC pressure unit+17V voltage output end.
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| CN106253794A (en) * | 2016-08-24 | 2016-12-21 | 东莞市杰美电器有限公司 | The circuit for controlling motor of garbage disposer and method for controlling of operation |
| CN109188268A (en) * | 2018-07-13 | 2019-01-11 | 广东瑞德智能科技股份有限公司 | A kind of modified low cost motor open circuit detecting device |
| CN109509680A (en) * | 2018-12-25 | 2019-03-22 | 深圳和而泰小家电智能科技有限公司 | Relay protection circuit |
| CN110418472A (en) * | 2018-04-27 | 2019-11-05 | 广州市番禺奥莱照明电器有限公司 | A kind of light half or completely control method for incandescent lamp |
| CN110470988A (en) * | 2019-09-18 | 2019-11-19 | 东莞市润达散热风扇有限公司 | A kind of brushless motor multifunctional testing circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110470988A (en) * | 2019-09-18 | 2019-11-19 | 东莞市润达散热风扇有限公司 | A kind of brushless motor multifunctional testing circuit |
| CN113206620A (en) * | 2021-05-18 | 2021-08-03 | 中山市科卓尔电器有限公司 | Series excited machine brake control circuit with mechanical switch and time-delay brake |
| CN113206620B (en) * | 2021-05-18 | 2022-06-21 | 中山市科卓尔电器有限公司 | Series excited machine brake control circuit with mechanical switch and time-delay brake |
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