CN201994892U - Intelligent built-in electronic arc-extinguishing bypass type soft starter - Google Patents
Intelligent built-in electronic arc-extinguishing bypass type soft starter Download PDFInfo
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- CN201994892U CN201994892U CN2011200809520U CN201120080952U CN201994892U CN 201994892 U CN201994892 U CN 201994892U CN 2011200809520 U CN2011200809520 U CN 2011200809520U CN 201120080952 U CN201120080952 U CN 201120080952U CN 201994892 U CN201994892 U CN 201994892U
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Abstract
The utility model discloses an intelligent built-in electronic arc-extinguishing bypass type soft starter which comprises an electric motor and is characterized in that the starter also comprises a single chip machine, a voltage adjuster, a current detecting and protecting module, a phase failure detecting module, a bypass relay control module, a communication module, a display device and a keyboard; wherein the electric motor is connected with the voltage adjuster, the voltage adjuster is connected with the data port of the single chip machine; the display device, the keyboard, the current detecting and protecting module, the phase failure detecting module and the bypass relay control module are connected with the data port of the single chip machine; the communication module is connected with the communication port of the single chip machine, and the bypass relay control module is connected with the voltage adjustor. The soft starting controller has functions of flexible button setting, obvious liquid crystal display, various types of starting methods, current limiting protection, phase failure protection and the like. The voltage adjustor adopts a three-phase inverse parallel linked thyristor module so as to have high control precision. The storage of an electrically erasable programmable read-only memory (EEPROM) in the serial sheet of the single chip machine is flexible and reliable, the display can be directly viewed by the display device, and RS485 communication is flexible, so that the cost performance of the whole controller is higher.
Description
Technical field
The utility model relates to a kind of intelligent built-in electronic blow-out bypass type soft starter.
Background technology
High-power threephase asynchronous motor is simple in structure with it, dependable performance and be widely used in all types of industries field.High power motor can produce very big impulse current to electrical network in the moment of across-the-line starting, and mechanical transmission component is owing to impact torque produces fault.And across-the-line starting burns out winding easily, does not more allow the bringing onto load across-the-line starting.So people also update the starting technique of threephase asynchronous.The soft start technology is developed into the intelligent soft starting of modern thyristor voltage regulation control by initial stator crosstalk resistance, star delta starting, self-coupling decompression starting.Traditional soft start control system configuration complexity, parts are numerous, bulky, cause the failure rate height, shortcomings such as maintenance difficult and maintenance cost height.
The utility model content
According to above deficiency of the prior art, the technical problems to be solved in the utility model is: provide a kind of and can overcome above-mentioned defective, simple and practical, as to protect motor to greatest extent intelligent built-in electronic blow-out bypass type soft starter.
The technical scheme that its technical problem that solves the utility model adopts is: a kind of intelligent built-in electronic blow-out bypass type soft starter; comprise motor; it is characterized in that: also comprise single-chip microcomputer; voltage regulator; the current detecting protection module; open phase detection module; the bypass relay control module; communication module; display and keyboard; motor is connected with voltage regulator; voltage regulator connects the data port of single-chip microcomputer; display; keyboard; current detecting protection module and open phase detection module; the bypass relay control module connects the data port of single-chip microcomputer; communication module connects the communication port of single-chip microcomputer, and the bypass relay control module is connected with voltage regulator.
Described voltage regulator comprises three-phase anti-parallel thyristor module and D/A converter, and three-phase anti-parallel thyristor module connects single-chip microcomputer by D/A converter.
Described current detecting protection module comprises Hall current sensor, filter circuit, amplifying circuit, A/D modular converter, and Hall current sensor connects motor, and connects single-chip microcomputer by filter circuit, amplifying circuit, A/D modular converter.
Described open phase detection module comprises rectification circuit, filter circuit and photoisolator, and the three-phase voltage of motor is connected photoisolator by rectification circuit with filter circuit respectively with neutral point, and photoisolator connects the data port of single-chip microcomputer.
Described communication module comprises communication chip and photoisolator, and communication chip has RS485 communication protocol, connects single-chip microcomputer by photoisolator.
EEPROM in the described single-chip microcomputer serial sheet.
Described bypass relay control module comprises output photoisolator and bypass relay, and single-chip microcomputer connects the bypass relay by the output photoisolator, and the bypass relay is connected with three-phase anti-parallel thyristor module.
Utilize the phase shifting control principle of thyristor, control circuit is by predetermined different start modes, by detecting the benchmark of synchronous voltage signal as the phase shifting control pulse, detect the feedback current signal of main circuit, compare with set point, calculate the control voltage that controlled quentity controlled variable is regulated three-phase anti-parallel thyristor module, thereby realize the adjusting of ac output voltage, the terminal voltage of motor is raise gradually with the speed of setting, reach purpose by voltage regulating mode control starting current and starting torque.When motor starting was finished and reach rated voltage, by photoisolator control three-phase bypass relay closes, motor directly dropped into operation of power networks.Because soft starter is electronic pressure regulating and electric current is detected therefore also have heat protection, torque-limiting and rush of current to motor and soft starter itself, defencive functions such as three phase mains imbalance, phase shortage, the phase failure.
The no-load voltage ratio of current transformer at first is set by keyboard, start mode, starting voltage, starting current, the starting time, parameters such as dwell time, and record in the single-chip microcomputer.Select start button then, enter the starting state of setting, along with the rising of output voltage, motor speed constantly increases until reaching rated speed, and behind the proceed-to-send, the bypass relay is devoted oneself to work, and three-phase anti-parallel thyristor module is deactivated.When motor after hours, select soft stop button, enter the soft halted state of setting, the quick conducting of three-phase anti-parallel thyristor module, disconnect the bypass relay, single-chip microcomputer realizes that through serial D/A transducer control three-phase anti-parallel thyristor module the voltage of motor progressively descends, and rotating speed steadily descends, drop to 0 up to rotating speed, soft stopping to be finished.
The beneficial effect that the utility model had is: this soft starting controller has button and is provided with flexibly, and liquid crystal display is directly perceived, and start mode is various, functions such as current-limiting protection and open-phase protection.Voltage regulator adopts three-phase anti-parallel thyristor module controls precision height.EEPROM storage flexibility and reliability adopts the display intuitive display in the single-chip microcomputer serial sheet, and the RS485 communication is flexible, makes that the entire controller cost performance is higher.
Description of drawings
Fig. 1 is the utility model block diagram;
Fig. 2 is the utility model voltage regulator, display, communication module and single-chip microcomputer connecting circuit schematic diagram;
Fig. 3 is that the utility model phase shortage detects schematic diagram;
Embodiment
Below in conjunction with accompanying drawing embodiment of the present utility model is described further:
As Fig. 1～shown in Figure 3; a kind of intelligent built-in electronic blow-out bypass type soft starter; comprise motor; also comprise single-chip microcomputer; voltage regulator; the current detecting protection module; open phase detection module; the bypass relay control module; communication module; display and keyboard; motor is connected with voltage regulator; voltage regulator connects the data port of single-chip microcomputer; display; keyboard; current detecting protection module and open phase detection module; the bypass relay control module connects the data port of single-chip microcomputer; communication module connects the communication port of single-chip microcomputer, and the bypass relay control module is connected with voltage regulator.
Described voltage regulator comprises three-phase anti-parallel thyristor module and D/A converter, and three-phase anti-parallel thyristor module connects single-chip microcomputer by D/A converter.
Described current detecting protection module comprises Hall current sensor, filter circuit, amplifying circuit, A/D modular converter, and Hall current sensor connects motor, and connects single-chip microcomputer by filter circuit, amplifying circuit, A/D modular converter.
Described lack detection circuit comprises rectification circuit, filter circuit and input photoisolator, the three-phase voltage of motor is connected the input photoisolator by rectification circuit respectively with neutral point with filter circuit, the input photoisolator connects the data port of single-chip microcomputer.
Described communication module comprises communication chip and photoisolator, and communication chip has RS485 communication protocol, connects single-chip microcomputer by photoisolator.
Described bypass relay control module comprises output photoisolator and bypass relay, and single-chip microcomputer connects the bypass relay by photoisolator, and the bypass relay is connected with three-phase anti-parallel thyristor module.
Utilize the phase shifting control principle of thyristor, control circuit is by predetermined different start modes, by detecting the benchmark of synchronous voltage signal as the phase shifting control pulse, detect the feedback current signal of main circuit, compare with set point, calculate the control voltage that controlled quentity controlled variable is regulated three-phase anti-parallel thyristor module, thereby realize the adjusting of ac output voltage, the terminal voltage of motor is raise gradually with the speed of setting, reach purpose by voltage regulating mode control starting current and starting torque.When motor starting was finished and reach rated voltage, by photoisolator control three-phase bypass relay closes, motor directly dropped into operation of power networks.Because soft starter is electronic pressure regulating and electric current is detected therefore also have heat protection, torque-limiting and rush of current to motor and soft starter itself, defencive functions such as three phase mains imbalance, phase shortage, the phase failure.
The no-load voltage ratio of current transformer at first is set by keyboard, start mode, starting voltage, starting current, the starting time, parameters such as dwell time, and record in the single-chip microcomputer.Select start button then, enter the starting state of setting, along with the rising of output voltage, motor speed constantly increases until reaching rated speed, and behind the proceed-to-send, the bypass relay is devoted oneself to work, and three-phase anti-parallel thyristor module is deactivated.When motor after hours, select soft stop button, enter the soft halted state of setting, the quick conducting of three-phase anti-parallel thyristor module, disconnect the bypass relay, single-chip microcomputer realizes that through serial D/A transducer control three-phase anti-parallel thyristor module the voltage of motor progressively descends, and rotating speed steadily descends, drop to 0 up to rotating speed, soft stopping to be finished.
Wherein single-chip microcomputer adopts the PIC16F916 single-chip microcomputer, the PIC16F916 chip has 28 pins, a built-in oscillator of high stability 8MHz is arranged in the sheet, 2.0V to the wide voltage operation mode of 5.5V, has 14KB flash memory program storage, up to the RAM of 352 bytes and the digital EEPROM of 256 bytes, chip has the under-voltage reset function, enhancement mode WatchDog Timer (WDT), low-voltage able to programme detect merit, 3 timers and 2 seizure/comparison/PWM modules, five tunnel ten bit A/D converters, peripheral circuit is simple.Pin RA0-RA7, RB0-RB7, RC0-RC7, all can be used as general purpose I/O and LCD simulation output, I/O mouth number has 24.Be 8 the higher single-chip microcomputers of cost performance that relatively are suitable for switching value signal input detection.
Communication chip adopts the MAX487 chip to realize the RS485 Communication Control.The MAX487 chip has RS485 communication protocol, can be with 128 of slave computers, transmission range to reach 250kb/s greater than 1km, transmission rate.Intelligent controller can link to each other with supervisory computer by the RS485 bus, finishes the system management of intelligent built-in electronic blow-out bypass type soft starter.The DE of MAX487 is the transmitter Enable Pin, and DE is that 1 o'clock transmitter can be worked, and DI is an input, and A, B are output.When DE was 0, stopping to send output was high resistant.RE is the input Enable Pin, and RE is 0 o'clock permission receiver operation, and A, B are input, and RO is an output; RE is 1 o'clock, and receiver is under an embargo, and RO is a high-impedance state.Therefore, adopt the half duplex communication mode,, control the transmitting-receiving operating state by the RC5 pin the RC5 pin that DE links to each other with RE and meets PIC16F916 then.The PIC16F916 single-chip microcomputer is realized the photoelectricity isolation through photoisolator, and the preferred high speed photo coupling 6N137 of photoisolator finishes serial communication and receives and send control.
Three-phase anti-parallel thyristor module connects single-chip microcomputer by D/A converter, and it is 10 that D/A converter is selected its resolution of MAX515 for use, and voltage output is 20 delicate settling time, and operating voltage Vcc is voltage 5V.The input of DI serial data, SL is serial shift pulse input, and CS is sheet choosing input, and low level is effective.Preferably utilize photoisolator to transmit the signal of telecommunication when MAX515 and the communication of monolithic electromechanics, preferred high speed photo coupling 6N1371.
Phase shortage detects power taking motivation three-phase phase voltage Va, Vb, Vc respectively, with neutral point V0, draw signal respectively through inserting photoisolator behind 75K resistance and diode halfwave rectifier and the capacitor filtering, winding diagram as shown in Figure 2, through photoisolator EL817, the three-phase voltage switching value is inserted RA3, RA4, the RA5 pin of PIC16F916.
Single-chip microcomputer is directly controlled the bypass relay by photoisolator, finishes the control of bypass relay module.
The signal of telecommunication is transmitted in the coupling that utilizes photoisolator to pass through light in system, improves the whole system anti-jamming capacity.
It is current limitation starting, voltage ramp starting, the soft start of voltage ramp threshold currents, kick torque starting that this intelligent built-in electronic blow-out bypass type soft starter can be finished four kinds of Starting mode.The user can select different start modes according to different loads and concrete service condition, realizes the optimum organization of starting current and load torque.
(1) current limitation control of soft mode adopts the Current Negative Three-Point Capacitance closed-loop control, set-point is the current limitation value, utilize current transformer to detect the current value of armature reality, the drift gage of the two is calculated output valve U (k), U (k) regulates the control voltage of three-phase anti-parallel thyristor module, realizes utilizing electric current loop to regulate starting current and is no more than user's set point.During starting, electric current rises to set point with certain slope, keep thereafter constant, until proceed-to-send.The bypass relay is devoted oneself to work then, and three-phase anti-parallel thyristor module is deactivated.The amplitude limit value of electric current can be adjusted according to the actual loading situation, and setting range is 1 to 5 times of motor rated current Ie.This mode starting current is little, can adjust as required, and is less to electric network influencing, is adapted to most application scenarios.
(2) Mathematical Modeling of voltage ramp control of soft mode is suc as formula Ua=(Ue-Ur) * t/Tr+Ur, in this mathematics model, output voltage when Ua is voltage ramp soft start pattern, Ue is specified phase voltage, Ur is the initial voltage of soft starter output, Tr is the soft starting time of soft starting controller, and t is the current time in the soft starting time; Then according to the level and smooth boosted output voltages of setting of soft starting time t until reaching rated voltage Ue, along with the rising of output voltage, motor speed constantly increases until reaching rated speed, until proceed-to-send.The bypass relay is devoted oneself to work then, and three-phase anti-parallel thyristor module is deactivated.
(3) voltage ramp current-limiting soft-starting control mode has been concentrated the advantage of preceding two kinds of originate modes, output voltage steadily rose with the starting time of setting, and output current increases with certain speed simultaneously, when starting current increases to current limit Im, it is constant that electric current keeps, until proceed-to-send.The bypass relay is devoted oneself to work then, and three-phase anti-parallel thyristor module is deactivated.
(4) in kick torque control of soft mode, Tk is the time that applies kick initial voltage Uk, is traditionally arranged to be 3 seconds, and initial voltage is a Uk=300 volt, and when t＜=Tk, the soft start output voltage is Ua=Uk.When t＞Tk, the soft start output voltage is that Ua is suc as formula shown in Ua=(Ue-Ur) * (t-Tk)/(Tr-Tk)+Ur.Ua is the soft start output voltage, and Ue is a rated voltage, and Ur is an initial voltage, and Tr is a soft starting time, and Tk is the kick time, and t is the current time; Kick torque soft start pattern is mainly used on the bigger load motor of stiction, by applying an instantaneous bigger starting torque to overcome big stiction.Output voltage reaches the step voltage (Uk) of setting rapidly under this pattern, reduces to starting voltage after reaching the predefined kick time (Tk), again according to the level and smooth boosted output voltages of setting of starting time up to rated voltage Ue, until proceed-to-send.The bypass relay is devoted oneself to work then, and three-phase anti-parallel thyristor module is deactivated.
Claims (7)
1. intelligent built-in electronic blow-out bypass type soft starter; comprise motor; it is characterized in that: also comprise single-chip microcomputer; voltage regulator; the current detecting protection module; open phase detection module; the bypass relay control module; communication module; display and keyboard; motor is connected with voltage regulator; voltage regulator connects the data port of single-chip microcomputer; display; keyboard; current detecting protection module and open phase detection module; the bypass relay control module connects the data port of single-chip microcomputer; communication module connects the communication port of single-chip microcomputer, and the bypass relay control module is connected with voltage regulator.
2. intelligent built-in electronic blow-out bypass type soft starter according to claim 1, it is characterized in that: described voltage regulator comprises three-phase anti-parallel thyristor module and D/A converter, three-phase anti-parallel thyristor module connects single-chip microcomputer by D/A converter.
3. intelligent built-in electronic blow-out bypass type soft starter according to claim 1; it is characterized in that: described current detecting protection module comprises Hall current sensor, filter circuit, amplifying circuit, A/D modular converter; Hall current sensor connects motor, and connects single-chip microcomputer by filter circuit, amplifying circuit, A/D modular converter.
4. intelligent built-in electronic blow-out bypass type soft starter according to claim 1, it is characterized in that: described open phase detection module comprises rectification circuit, filter circuit and photoisolator, the three-phase voltage of motor is connected photoisolator by rectification circuit with filter circuit respectively with neutral point, and photoisolator connects the data port of single-chip microcomputer.
5. intelligent built-in electronic blow-out bypass type soft starter according to claim 1, it is characterized in that: described communication module comprises communication chip and photoisolator, communication chip has RS485 communication protocol, connects single-chip microcomputer by photoisolator.
6. intelligent built-in electronic blow-out bypass type soft starter according to claim 1 is characterized in that: EEPROM in the described single-chip microcomputer serial sheet.
7. intelligent built-in electronic blow-out bypass type soft starter according to claim 1 and 2, it is characterized in that: described bypass relay control module comprises output photoisolator and bypass relay, single-chip microcomputer connects the bypass relay by the output photoisolator, and the bypass relay is connected with three-phase anti-parallel thyristor module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200809520U CN201994892U (en) | 2011-03-24 | 2011-03-24 | Intelligent built-in electronic arc-extinguishing bypass type soft starter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200809520U CN201994892U (en) | 2011-03-24 | 2011-03-24 | Intelligent built-in electronic arc-extinguishing bypass type soft starter |
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| Publication Number | Publication Date |
|---|---|
| CN201994892U true CN201994892U (en) | 2011-09-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011200809520U Expired - Lifetime CN201994892U (en) | 2011-03-24 | 2011-03-24 | Intelligent built-in electronic arc-extinguishing bypass type soft starter |
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| Country | Link |
|---|---|
| CN (1) | CN201994892U (en) |
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2011
- 2011-03-24 CN CN2011200809520U patent/CN201994892U/en not_active Expired - Lifetime
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: WANG HUAIYI Effective date: 20130219 Owner name: LI LEI Free format text: FORMER OWNER: ZIBO LINZI GALAXY HIGH TECHNOLOGY DEVELOPMENT CO., LTD. Effective date: 20130219 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20130219 Address after: 255400 No. 432, Linzi Avenue, Linzi District, Shandong, Zibo Patentee after: Li Lei Patentee after: Wang Huaiyi Address before: 255400 No. 432, Linzi Avenue, Linzi District, Shandong, Zibo Patentee before: Zibo Linzi Yinhe High-tech Development Co., Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110928 |