CN102005691A - Method for controlling laser power supply energy based on DSP (Digital Signal Processor) - Google Patents
Method for controlling laser power supply energy based on DSP (Digital Signal Processor) Download PDFInfo
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Abstract
The invention discloses a CO2 laser power supply intelligent controller developed based on a digital signal processor (DSP) TMS320LF2410. The quickness and the stability of laser energy can be realized by adopting a method of glow start constant-voltage control and work constant-current control. The invention provides an on-line discrimination method for laser power supply idle load, laser tube damage and other abnormal conditions and a drive signal isolating interlocking circuit aiming at the potential hazard for intervening and causing the straightway of a bridge type circuit. The invention has the advantages that: the laser output energy can be quickly and accurately stabilized by adopting the DSP to carry out constant-voltage and constant-current control on the laser power supply; the straightway of an upper bridge arm and a lower bridge arm at abnormal state can be effectively avoided by directly using control signals of MOSFET (Metal-Oxide -Semiconductor Field Effect Transistor) tube grid electrodes of the upper bridge arm and the lower bridge arm as an interlocking signal source; and the laser source idle load, the damage of the laser tube and other abnormal conditions can be identified on line and the work of the power supply can be instantly stopped when the CO2 laser source is in open circuit and the damage of the laser tube and other abnormal conditions generate, thereby the phenomenon that the power supply is burnt down because the high voltage cannot be discharged in time can be effectively avoided.
Description
Technical field
The present invention relates to CO
2The development of Laser Power Devices digital intelligent controller.This controller adopts digital signal processor to generate the drive signal of bridge circuit; and thereby design circuit directly carries out interlock protection to upper and lower bridge arm MOSFET pipe drive signal and avoided disturbing and cause straight-through hidden danger, proposed a kind of in the laser energy stabilization process method of abnormal conditions such as the zero load of Real time identification Laser Power Devices, laser tube damage.
Background technology
CO
2Laser Power Devices are widely used in welding, the energy of Gas LASER Tube is supplied with in cutting, mark, scribing, the quarter every field such as film; Yet the ubiquity Laser Power Devices are fragile on the current market exports unsettled present situation with laser energy, has restricted the development of laser industry.Usually, CO
2When Laser Power Devices zero load or defective insulation, form high voltage electric field between high pressure connection and the outer casing of power supply, cause power supply to burn by ionization arcing discharge easily.And laser tube is damaged or the serious also entail dangers to excitation power supply during to himself load characteristic of change of gas leakage.In addition, the raising of processing technology level is had higher requirement to the photostability that goes out of laser tube, also requires to promote CO simultaneously
2The performance of Laser Power Devices.
Summary of the invention
The present invention is based on digital signal processor (DSP) TMS320LF2401 and developed CO
2Laser power controller, the method of taking control of starter constant voltage and work constant current to control has realized the fast and stable of laser energy, proposed the method for discrimination of abnormal conditions such as a kind of Laser Power Devices zero load, laser tube damage, and caused that at interference the straight-through hidden danger of bridge circuit has designed the drive signal interlock circuit.
A kind of method of laser energy fast and stable: the frequency of the drive signal (PWM ripple) that estimates main circuit that Laser Power Devices adopt (bridge circuit) according to the Laser Power Devices power output of setting and laser tube starting voltage and initial pulsewidth, the output voltage values of sampling Laser Power Devices the secondary coil on the high voltage package (high-tension transformer) of Laser Power Devices, and passing ratio negative feedback adjusting PWM ripple pulsewidth, thereby the quick constant voltage starter of realization Laser Power Devices.Simultaneously, come the operating current of detection laser pipe by the electric current of sampling laser tube output loop.In case laser tube produces electric current output, enters the constant current mode of operation immediately.
The complementary symmetrical PWM ripple of a kind of phase shift generation method (see figure 2): the crystal oscillator frequency of setting TMS320LF2401 is outside input clock, frequency doubling system clock and general purpose timer clock, configuration cycle register T1PR value is 1/2 of PWM frequency and general purpose timer clock frequency ratio TPR, general purpose timer T1 compare operation is set for increasing and decreasing count mode (TMODE1/TMODE0=0x01) continuously and being configured as comparand register * CMPR1 and the benchmark timer of * CMPR2; Enable the comparing function of comparand register * CMPR1 and * CMPR2, disposing corresponding pulse width modulated wave output pin PWM1, PWM3, to be respectively high level effective and low level is effective; PWM1 pin output waveform duty ratio is * CMPR1/ (TPR/2) like this, and PWM3 pin output waveform duty ratio is (TPR/2-*CMPR2)/(TPR/2), makes that the comparand register sum is TPR/2, then can generate the complementary symmetrical PWM ripple of a pair of phase shift; Adopt symmetrical PWM waveform generation mechanism that TMS320LF240x provides and can generate the drive waveforms of bridge circuit easily, also can save program runtime by choose reasonable and configuration register.Set comparand register * CMPR1=0*CMPR2=TPR/2 during program initialization, setting PWM1, PWM3 duty ratio are zero; Only needing to revise this in the timer interrupt routine of voltage stabilizing or current stabilization gets final product the value that compares register.
Upper and lower bridge arm drive signal interlock circuit (see figure 3), resistance R 1 one termination PWM1 signal pins in the last bridge arm circuit, 2 pin of the other end and optical coupling isolator 6N135 join; 3 pin of U1 (optical coupling isolator 6N135) meet the reference ground GND1 of PWM1, and 8 pin of U1 and resistance R 2 one ends join, and an end of 6 pin of U1 and resistance R 3, resistance R 4 joins, and 5 pin of U1 meet the reference ground GND2 of PWM2; The other end of resistance R 2 links to each other with the negative electrode of diode D1; The PWM2 signal pins links to each other with anode, resistance R g1 one end of diode D1; The other end of resistance R g1 links to each other with the grid of MOSFET pipe Q1 with the collector electrode of resistance R 3, resistance R 5, resistance R gs1, triode T2; The other end of resistance R 5 links to each other with the base stage of triode T2 and the collector electrode of triode T1; The base stage of triode T1 links to each other with resistance R 4; The source electrode of the end of triode T1 emitter, triode T2 emitter, resistance R gs1 and MOSFET pipe Q1 links to each other with reference ground GND2.Resistance R 6 one termination PWM2 signal pins in the following bridge arm circuit, 2 pin of the other end and U2 (optical coupling isolator 6N135) join; 3 pin of U2 meet the reference ground GND2 of PWM1, and 8 pin of U2 and resistance R 7 one ends join, and an end of 6 pin of U2 and resistance R 8, resistance R 9 joins, and 5 pin of U2 meet the reference ground GND1 of PWM2; The other end of resistance R 7 links to each other with the negative electrode of diode D2; The PWM1 signal pins links to each other with anode, resistance R g2 one end of diode D2; The other end of resistance R g2 links to each other with the grid of MOSFET pipe with the collector electrode of resistance R 8, resistance R 10, resistance R gs2, triode T4; The other end of resistance R 10 links to each other with the base stage of triode T4 and the collector electrode of triode T3; The base stage of triode T3 links to each other with resistance R 9; The end of triode T3 emitter, triode T4 emitter, resistance R gs2 and the source electrode of MOSFET link to each other with reference ground GND1.
Abnormal conditions ONLINE RECOGNITION methods such as a kind of Laser Power Devices zero load, laser tube damage: the load current in the process of stabilized lasers power supply energy on the real-time monitoring laser pipe; discern abnormal conditions such as laser tube damage or Laser Power Devices zero load by judging whether it in time responds the current value of setting and have or not laser to export, Laser Power Devices energy stabilization and abnormal conditions are differentiated with the workflow of protecting and are seen Fig. 4.Wherein, in power supply constant voltage starter process,, just be judged to be the power supply zero load, immediately shutdown if laser tube load output current (assurance starter process is finished) in very short time is zero always; Otherwise, enter power supply PI constant current control program.In power supply constant current control procedure, when feedback effect makes the PWM pulsewidth of output reach the maximum duty cycle of setting, if laser tube load output current is lower than given current value within a certain period of time always, it is unusual just to be judged to be laser tube damage etc., shutdown in time; Otherwise continue power supply is carried out PI constant current control and monitoring in real time.In addition, if power supply constant current when work, laser tube load output current is zero and is judged to be Laser Power Devices zero load, shutdown immediately.
A kind of Laser Power Devices method of energy control based on DSP of the present invention is achieved in that integrated AD gathers the feedback voltage of high voltage package generation and the voltage of CO2 laser tube output current correspondence on the sheet that adopts digital signal processor TMS320LF2401, calculate the also duty ratio of real-time update PWM ripple according to the constant pressure and flow feedback control principle, produce high-frequency and high-voltage by the half-bridge change-over circuit again, utilize that the high voltage package transformation is boosted, excitation CO2 laser tube output laser after the rectification.
The PWM ripple signal that the TMS320LF2401 digital signal processor generates is a Transistor-Transistor Logic level, drives the half-bridge change-over circuit again through level shifting circuit, signal isolation circuit and signal interlock protection circuit.The method of abnormal conditions such as zero load of ONLINE RECOGNITION Laser Power Devices or laser tube damage prevents CO by the effective measures that real-time monitoring laser pipe output current comes ONLINE RECOGNITION abnormal conditions and timely protection Laser Power Devices in the laser energy stabilization process
2When Laser Power Devices zero load or defective insulation, form high voltage electric field between high pressure connection and the outer casing of power supply, cause power supply to burn by ionization arcing discharge easily.
The advantage of a kind of Laser Power Devices method of energy control based on DSP of the present invention is:
1) adopt DSP that Laser Power Devices are carried out constant pressure and flow control stabilized lasers output quickly and accurately energy.
2) control signal of directly utilizing upper and lower bridge arm MOSFET tube grid is as the interlocking signal source, avoided the straight-through of upper and lower bridge arm under the abnormality effectively.
3) can the zero load of ONLINE RECOGNITION Laser Power Devices, abnormal conditions such as laser tube damage, stop power work immediately when guaranteeing unusual conditions generation such as CO2 Laser Power Devices open circuit and laser tube damage, thereby avoided high pressure in time to release effectively and burn power supply.
Description of drawings
Fig. 1 is a Laser Power Devices control principle block diagram.
Fig. 2 is the complementary symmetrical PWM ripple of phase shift schematic diagram.
Fig. 3 is upper and lower bridge arm drive signal interlock circuit figure.
Fig. 4 is a Laser Power Devices energy control program flow chart.
Embodiment
Shown in Fig. 1-4, a kind of Laser Power Devices method of energy control based on DSP: integrated AD gathers the feedback voltage of high voltage package generation and the voltage of CO2 laser tube output current correspondence on the sheet of employing digital signal processor TMS320LF2401, calculate the also duty ratio of real-time update PWM ripple according to the constant pressure and flow feedback control principle, produce high-frequency and high-voltage by the half-bridge change-over circuit again, utilize that the high voltage package transformation is boosted, excitation CO2 laser tube output laser after the rectification.The PWM ripple signal that the TMS320LF2401 digital signal processor generates is a Transistor-Transistor Logic level, drives the half-bridge change-over circuit again through level shifting circuit, signal isolation circuit and signal interlock protection circuit.The method of abnormal conditions such as zero load of ONLINE RECOGNITION Laser Power Devices or laser tube damage prevents CO by the effective measures that real-time monitoring laser pipe output current comes ONLINE RECOGNITION abnormal conditions and timely protection Laser Power Devices in the laser energy stabilization process
2When Laser Power Devices zero load or defective insulation, form high voltage electric field between high pressure connection and the outer casing of power supply, cause power supply to burn by ionization arcing discharge easily.
A kind of method of laser energy fast and stable: the frequency of the drive signal (PWM ripple) that estimates main circuit that Laser Power Devices adopt (bridge circuit) according to the Laser Power Devices power output of setting and laser tube starting voltage and initial pulsewidth, the output voltage values of sampling Laser Power Devices the secondary coil on the high voltage package (high-tension transformer) of Laser Power Devices, and passing ratio negative feedback adjusting PWM ripple pulsewidth, thereby the quick constant voltage starter of realization Laser Power Devices.Simultaneously, come the operating current of detection laser pipe by the electric current of sampling laser tube output loop.In case laser tube produces electric current output, enters the constant current mode of operation immediately.
The complementary symmetrical PWM ripple of a kind of phase shift generation method (see figure 2): the crystal oscillator frequency of setting TMS320LF2401 is outside input clock, frequency doubling system clock and general purpose timer clock, configuration cycle register T1PR value is 1/2 of PWM frequency and general purpose timer clock frequency ratio TPR, general purpose timer T1 compare operation is set for increasing and decreasing count mode (TMODE1/TMODE0=0x01) continuously and being configured as comparand register * CMPR1 and the benchmark timer of * CMPR2; Enable the comparing function of comparand register * CMPR1 and * CMPR2, disposing corresponding pulse width modulated wave output pin PWM1, PWM3, to be respectively high level effective and low level is effective; PWM1 pin output waveform duty ratio is * CMPR1/ (TPR/2) like this, and PWM3 pin output waveform duty ratio is (TPR/2-*CMPR2)/(TPR/2), makes that the comparand register sum is TPR/2, then can generate the complementary symmetrical PWM ripple of a pair of phase shift; Adopt symmetrical PWM waveform generation mechanism that TMS320LF240x provides and can generate the drive waveforms of bridge circuit easily, also can save program runtime by choose reasonable and configuration register.Set comparand register * CMPR1=0, * CMPR2=TPR/2 during program initialization, setting PWM1, PWM3 duty ratio are zero; Only needing to revise this in the timer interrupt routine of voltage stabilizing or current stabilization gets final product the value that compares register.
Upper and lower bridge arm drive signal interlock circuit (see figure 3), resistance R 1 one termination PWM1 signal pins in the last bridge arm circuit, 2 pin of the other end and optical coupling isolator U1 join; 3 pin of optical coupling isolator U1 meet the reference ground GND1 of PWM1, and 8 pin of optical coupling isolator U1 and resistance R 2 one ends join, and an end of 6 pin of optical coupling isolator U1 and resistance R 3, resistance R 4 joins, and 5 pin of optical coupling isolator U1 meet the reference ground GND2 of PWM2; The other end of resistance R 2 links to each other with the negative electrode of diode D1; The PWM2 signal pins links to each other with anode, resistance R g1 one end of diode D1; The other end of resistance R g1 links to each other with the grid of MOSFET pipe Q1 with the collector electrode of resistance R 3, resistance R 5, resistance R gs1, triode T2; The other end of resistance R 5 links to each other with the base stage of triode T2 and the collector electrode of triode T1; The base stage of triode T1 links to each other with resistance R 4; The source electrode of the end of triode T1 emitter, triode T2 emitter, resistance R gs1 and MOSFET pipe Q1 links to each other with reference ground GND2.Resistance R 6 one termination PWM2 signal pins in the following bridge arm circuit, 2 pin of the other end and optical coupling isolator U2 join; 3 pin of optical coupling isolator U2 meet the reference ground GND2 of PWM1, and 8 pin of optical coupling isolator U2 and resistance R 7 one ends join, and an end of 6 pin of optical coupling isolator U2 and resistance R 8, resistance R 9 joins, and 5 pin of optical coupling isolator U2 meet the reference ground GND1 of PWM2; The other end of the resistance R 7 PWM1 signal pins that links to each other with the negative electrode of diode D2 links to each other with anode, resistance R g2 one end of diode D2; The other end of resistance R g2 links to each other with the grid of MOSFET pipe with the collector electrode of resistance R 8, resistance R 10, resistance R gs2, triode T4; The other end of resistance R 10 links to each other with the base stage of triode T4 and the collector electrode of triode T3; The base stage of triode T3 links to each other with resistance R 9; The end of triode T3 emitter, triode T4 emitter, resistance R gs2 and the source electrode of MOSFET link to each other with reference ground GND1.
Abnormal conditions ONLINE RECOGNITION methods such as a kind of Laser Power Devices zero load, laser tube damage: the load current in the process of stabilized lasers power supply energy on the real-time monitoring laser pipe; discern abnormal conditions such as laser tube damage or Laser Power Devices zero load by judging whether it in time responds the current value of setting and have or not laser to export, Laser Power Devices energy stabilization and abnormal conditions are differentiated with the workflow of protecting and are seen Fig. 4.Wherein, in power supply constant voltage starter process,, just be judged to be the power supply zero load, immediately shutdown if laser tube load output current (assurance starter process is finished) in very short time is zero always; Otherwise, enter power supply PI constant current control program.In power supply constant current control procedure, when feedback effect makes the PWM pulsewidth of output reach the maximum duty cycle of setting, if laser tube load output current is lower than given current value within a certain period of time always, it is unusual just to be judged to be laser tube damage etc., shutdown in time; Otherwise continue power supply is carried out PI constant current control and monitoring in real time.In addition, if power supply constant current when work, laser tube load output current is zero and is judged to be Laser Power Devices zero load, shutdown immediately.
Claims (4)
1. Laser Power Devices method of energy control based on DSP; it is characterized in that: integrated functional module designs the generation method of the complementary symmetrical PWM ripple of a kind of phase shift on the employing DSP sheet; and directly the drive signal of upper and lower bridge arm power MOSFET tube has been carried out interlock protection, propose a kind of in the process of laser energy fast and stable the zero load of ONLINE RECOGNITION Laser Power Devices or laser tube damage the method for abnormal conditions.
2. a kind of Laser Power Devices method of energy control according to claim 1 based on DSP, it is characterized in that: the complementary symmetrical PWM ripple of described phase shift generation method, adopt the symmetrical PWM waveform generation mechanism that the integration events manager provides on the Tms320LF240x sheet, select the reference clock of one of them general purpose timer for use as two relevant comparand registers, and to set two comparand register value sums be the period register value, and the significant level polarity of putting corresponding PWM pin is opposite; This method is real-time, and change PWM duty ratio only need be revised two comparand register values and get final product, thereby improves the stabilized speed and the precision of laser energy.
3. a kind of Laser Power Devices method of energy control according to claim 1 based on DSP, it is characterized in that: described drive signal interlock protection circuit, avoided interference to cause straight-through hidden danger thereby directly upper and lower bridge arm MOSFET pipe drive signal is carried out the isolation interlock protection; Wherein, last bridge arm circuit comprises: resistance R 1 one termination PWM1 signal pins, and 2 pin of the other end and optical coupling isolator U1 join; 3 pin of optical coupling isolator U1 meet the reference ground GND1 of PWM1, and 8 pin of optical coupling isolator U1 and resistance R 2 one ends join, and an end of 6 pin of optical coupling isolator U1 and resistance R 3, resistance R 4 joins, and 5 pin of optical coupling isolator U1 meet the reference ground GND2 of PWM2; The other end of resistance R 2 links to each other with the negative electrode of diode D1; The PWM2 signal pins links to each other with anode, resistance R g1 one end of diode D1; The other end of resistance R g1 links to each other with the grid of MOSFET pipe Q1 with the collector electrode of resistance R 3, resistance R 5, resistance R gs1, triode T2; The other end of resistance R 5 links to each other with the base stage of triode T2 and the collector electrode of triode T1; The base stage of triode T1 links to each other with resistance R 4; The source electrode of the end of triode T1 emitter, triode T2 emitter, resistance R gs1 and MOSFET pipe Q1 links to each other with reference ground GND2; Following bridge arm circuit comprises: resistance R 6 one termination PWM2 signal pins, and 2 pin of the other end and optical coupling isolator U2 join; 3 pin of optical coupling isolator U2 meet the reference ground GND2 of PWM1, and 8 pin of optical coupling isolator U2 and resistance R 7 one ends join, and an end of 6 pin of optical coupling isolator U2 and resistance R 8, resistance R 9 joins, and 5 pin of optical coupling isolator U2 meet the reference ground GND1 of PWM2; The other end of resistance R 7 links to each other with the negative electrode of diode D2; The PWM1 signal pins links to each other with anode, resistance R g2 one end of diode D2; The other end of resistance R g2 links to each other with the grid of MOSFET pipe with the collector electrode of resistance R 8, resistance R 10, resistance R gs2, triode T4; The other end of resistance R 10 links to each other with the base stage of triode T4 and the collector electrode of triode T3; The base stage of triode T3 links to each other with resistance R 9; The end of triode T3 emitter, triode T4 emitter, resistance R gs2 and the source electrode of MOSFET link to each other with reference ground GND1.
4. a kind of Laser Power Devices method of energy control according to claim 1 based on DSP; it is characterized in that: described in the laser energy stabilization process zero load of ONLINE RECOGNITION Laser Power Devices or laser tube damage the method for abnormal conditions; effective measures by real-time monitoring laser pipe output current comes ONLINE RECOGNITION abnormal conditions and timely protection Laser Power Devices prevent CO
2When Laser Power Devices zero load or defective insulation, form high voltage electric field between high pressure connection and the outer casing of power supply, cause power supply to burn by ionization arcing discharge easily; Laser Power Devices energy stabilization and abnormal conditions are differentiated with the workflow of protection as follows: in power supply constant voltage starter process, if laser tube load output current (assurance starter process is finished) in very short time is zero always, just be judged to be the power supply zero load, immediately shutdown; Otherwise, enter power supply PI constant current control program; In power supply constant current control procedure, when feedback effect makes the PWM pulsewidth of output reach the maximum duty cycle of setting, if laser tube load output current is lower than given current value within a certain period of time always, it is unusual just to be judged to be laser tube damage etc., shutdown in time; Otherwise continue power supply is carried out PI constant current control and monitoring in real time; In addition, if power supply constant current when work, laser tube load output current is zero and is judged to be Laser Power Devices zero load, shutdown immediately.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103138554A (en) * | 2013-04-03 | 2013-06-05 | 西安西驰电子传动与控制有限公司 | Upper half-bridge and lower half-bridge driving interlocking method of brushless direct current motor driver |
| CN103259158A (en) * | 2012-02-20 | 2013-08-21 | 深圳市大族激光科技股份有限公司 | Laser real-time control system and laser |
| CN103264230A (en) * | 2013-04-16 | 2013-08-28 | 周德海 | Laser power supply energy feedback control device |
| CN103414104A (en) * | 2013-08-20 | 2013-11-27 | 中国科学院半导体研究所 | All-solid-state laser driving power supply device achieving constant voltage / constant current automatic switching |
| CN106774583A (en) * | 2017-02-14 | 2017-05-31 | 苏州迅镭激光科技有限公司 | A kind of voltage output control system with high accuracy and efficient response |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101741002A (en) * | 2009-12-25 | 2010-06-16 | 中国船舶重工集团公司第七○九研究所 | Inductance-capacitance sine transform CO2 laser power supply |
-
2010
- 2010-09-28 CN CN 201010295249 patent/CN102005691B/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101741002A (en) * | 2009-12-25 | 2010-06-16 | 中国船舶重工集团公司第七○九研究所 | Inductance-capacitance sine transform CO2 laser power supply |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103259158A (en) * | 2012-02-20 | 2013-08-21 | 深圳市大族激光科技股份有限公司 | Laser real-time control system and laser |
| CN103259158B (en) * | 2012-02-20 | 2015-08-05 | 深圳市大族激光科技股份有限公司 | A kind of laser real-time control system and laser |
| CN103138554A (en) * | 2013-04-03 | 2013-06-05 | 西安西驰电子传动与控制有限公司 | Upper half-bridge and lower half-bridge driving interlocking method of brushless direct current motor driver |
| CN103138554B (en) * | 2013-04-03 | 2015-04-22 | 西安西驰电子传动与控制有限公司 | Upper half-bridge and lower half-bridge driving interlocking method of brushless direct current motor driver |
| CN103264230A (en) * | 2013-04-16 | 2013-08-28 | 周德海 | Laser power supply energy feedback control device |
| CN103264230B (en) * | 2013-04-16 | 2016-04-20 | 周德海 | A kind of Laser Power Devices energy back control device |
| CN103414104A (en) * | 2013-08-20 | 2013-11-27 | 中国科学院半导体研究所 | All-solid-state laser driving power supply device achieving constant voltage / constant current automatic switching |
| CN106774583A (en) * | 2017-02-14 | 2017-05-31 | 苏州迅镭激光科技有限公司 | A kind of voltage output control system with high accuracy and efficient response |
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