CN202221868U - Laser diode driving power source - Google Patents
Laser diode driving power source Download PDFInfo
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- CN202221868U CN202221868U CN2011202987575U CN201120298757U CN202221868U CN 202221868 U CN202221868 U CN 202221868U CN 2011202987575 U CN2011202987575 U CN 2011202987575U CN 201120298757 U CN201120298757 U CN 201120298757U CN 202221868 U CN202221868 U CN 202221868U
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Abstract
A laser diode driving power source comprises an isolating CAN (controller area network) communication module, an embedded controller, three field-effect transistor driving chips, a P-channel field-effect transistor, two N-channel field-effect transistors, a current sensor, an amplifier, a choking coil and a schottky diode. The laser diode driving power source is compatible to a high-power pulse operation mode and a continuous operation mode, integrates a function of real-time communication and all-digital parameter adjustment and control, is available to various laser diode excitation ways, and is capable of dynamically adjusting excitation current or pulse width of laser diodes and guaranteeing better beam quality and better stability of power or single-pulse energy outputted by a laser diode pump laser. The maximum current of the laser diode driving power source can be 120A, the current adjusting precision is 0.01A, stability degree is up to +-0.5%, the maximum modulation frequency under the pulse operation mode is 100kHz, and the rising edge ranges from 1us to 10us.
Description
Technical field
The utility model relates to a kind of laser diode drive power, particularly a kind of laser diode drive power.This power supply is fit to multiple semiconductor end pumping optical diode and side-pump laser diode, can be applicable on continuous pump and the pulse pump laser.This power supply has threshold current and the adjustment of dynamic current pulse duration especially, makes laser power or energy more stable.
Technical background
Laser diode drive power is adjusted electric current through current feedback with high-power FET or IGBT basically in the power tube amplification region at present, reaches the purpose of constant current, and this type power-efficient is low; Thermal losses is big, and when especially driving the laser diode of low-voltages such as 2V/60A, electric current is difficult to do greatly; Efficient accomplishes 60% at most, need add huge radiator and just can work, and environment for use is also had requirement; Otherwise can cause the damage of laser diode because of the overheated power tube that damages.
Aspect incentive mode, divide two big types at present, one type is continuous laser diode driving power, and one type is the pulsed laser diode driving power, and for traditional pulse power, rising edge of a pulse is very big when low-voltage and high-current.This has very big influence to the laser tube life-span for laser diode when big electric current is made a leapleap forward.
The traditional analog laser diode drive power exists anti-interference poor, and the spacing electromagnetic radiation of self is big, and the current ripples coefficient is big; Shortcomings such as the Current Control precision is not enough; When being connected with the miscellaneous equipment system, mainly still pattern is intended voltage adjustment electric current, enables and fault alarm through TTL; So just be easy to receive extraneous factor to disturb and particularly be applied on the electric light Q laser with high-voltage switch gear, particularly evident.
Summary of the invention
The purpose of the utility model is in order to overcome the defective of above-mentioned prior art, a kind of laser diode drive power to be provided, to improve the anti-interference and the Current Control precision of power supply, reducing the current ripples coefficient.
The technical solution of the utility model is following:
A kind of laser diode drive power; Its characteristics are to be made up of embedded controller, three FET chip for driving, P-channel field-effect transistor (PEFT) pipe, two N channel field-effect pipes, current sensor, amplifier, choking-winding and Schottky diodes; The first pulse-width modulation port of described this embedded controller connects the input pin of the first FET chip for driving; The output pin of this first FET chip for driving connects the G pin of P-channel field-effect transistor (PEFT) pipe, and the S pin of this P-channel field-effect transistor (PEFT) pipe connects the positive pole of power supply;
The second pulse-width modulation port of described embedded controller connects the input pin of the second FET chip for driving; The output pin of the second FET chip for driving connects the G pin of a N channel field-effect pipe, the S pin ground connection of a N channel field-effect pipe;
The D pin of the D pin of described P-channel field-effect transistor (PEFT) pipe and a described N channel field-effect pipe and an end of choking-winding form node; The D pin of the A pin of the other end of this choking-winding and Schottky diode, the input of laser diode, the 2nd N channel field-effect pipe forms node, and the K pin of described Schottky diode connects the positive pole of power supply VDD;
On the D pin of the D of a described P-channel field-effect transistor (PEFT) pipe pin and a described N channel field-effect pipe and the circuit between the described streamline circle, be provided with current sensor, the output of this current sensor links to each other with described embedded controller signal input part through amplifier;
The IO port of described embedded controller links to each other the S pin ground connection of the 2nd N channel field-effect pipe through the 3rd FET chip for driving with the G pin of described the 2nd N channel field-effect pipe.
Described embedded controller also links to each other with isolated form CAN communication module.
Described embedded controller charges to choking-winding through the first FET chip for driving and P-channel field-effect transistor (PEFT) pipe through the first pulse-width modulation port; Described embedded controller discharges to choking-winding through the second FET chip for driving and a N channel field-effect pipe through the second pulse-width modulation port; One fills one puts, and between described P-channel field-effect transistor (PEFT) pipe, a N channel field-effect pipe and choking-winding, forms concussion.The signal code that described current sensor is responsible for responding to through copper cash is gathered current signal; This current signal send described embedded controller after amplifier amplifies; After analog-to-digital conversion with embedded controller in the electric current set compare computing, described embedded controller forms a closed feedback loop through the PWM0 that changes and the duty ratio of PWM1; Make the current constant that flows through choking-winding, reach the needed constant current of laser diode (predetermined current).
Described Schottky diode is reversal connection; It is the output that the A pin of Schottky diode connects choking-winding; The K pin of Schottky diode connects the positive pole of power supply, mainly is in order to absorb the inverse electromotive force that described choking-winding produces, to protect described laser diode.
The technique effect of the utility model is following:
1, the utlity model has highpowerpulse and continuous operation mode compatibility, and integrated real-time communication function, the characteristics of digital parameter adjustment and control.Support the energisation mode of multiple laser diode, can dynamically adjust laser diode exciting current or pulsewidth, guarantee that the single pulse energy of laser diode-pumped laser output or power are more stable, beam quality is better.
The utility model has been realized pulse working mode and the compatibility of continuous operation mode on the high power laser diode driving power, and the electric current maximum can reach 120A; Current Regulation precision 0.01A, stability ± 0.5%, the highest 100kHz of pulse mode modulated frequency, rising edge are 1-10us.
Show that through experiment the utility model laser diode drive power is applied on continuous wave laser and the pulse laser; The laser stabilization degree improves a lot; Particularly on pulse laser; Through applying torrent and dynamically pulsewidth adjustment, the consistent performance of the single pulse energy of laser is reached ± 1%.
Description of drawings
Fig. 1 is the utility model laser diode drive power circuit block diagram.
Among the figure: 1-isolated form CAN communication module, 2-embedded controller, the 3-first FET chip for driving, 4-P channel field-effect pipe; The 5-second FET chip for driving, 6-the one N channel field-effect pipe, 7-current sensor, 8-amplifier; The 9-choking-winding, 10-the 3rd FET chip for driving, 11-the 2nd N channel field-effect pipe; The 12-Schottky diode, 13-laser diode, 14-power supply VDD.
Embodiment
Below in conjunction with embodiment and accompanying drawing the utility model is described further, but should limit the protection range of the utility model with this.
See also Fig. 1 earlier, Fig. 1 is the utility model laser diode drive power structure principle chart.Visible by figure; The utility model laser diode drive power; Its formation comprises embedded controller 2; The first pulse-width modulation port 0 of this embedded controller 2 connects the input pin of the first FET chip for driving 3, and the output pin of this first FET chip for driving 3 connects the G pin of P-channel field-effect transistor (PEFT) pipe 4, and the S pin of this P-channel field-effect transistor (PEFT) pipe 4 connects the positive pole of power supply VDD14;
The second pulse-width modulation port of described embedded controller 2 connects the input pin of the second FET chip for driving 5; The output pin of the second FET chip for driving 5 connects the G pin of a N channel field-effect pipe 6, the S pin ground connection of a N channel field-effect pipe 6;
The D pin of the D pin of described P-channel field-effect transistor (PEFT) pipe 4 and a described N channel field-effect pipe 6 and an end of choking-winding 9 form node; The D pin of the A pin of the other end of this choking-winding 9 and Schottky diode 12, the input of laser diode 13, the 2nd N channel field-effect pipe 11 forms node, and the K pin of described Schottky diode 12 connects the positive pole of power supply VDD14;
On the D pin of the D of described P-channel field-effect transistor (PEFT) pipe 4 pin and a described N channel field-effect pipe 6 and the circuit between the described streamline circle 9, be provided with current sensor 7, the output of this current sensor 7 links to each other with described embedded controller 2 signal input parts through amplifier 8;
The IO port of described embedded controller 2 links to each other the S pin ground connection of the 2nd N channel field-effect pipe 11 through the 3rd FET chip for driving 10 with the G pin of described the 2nd N channel field-effect pipe 11.
Embedded controller 2 is input to the pin IN through the first FET chip for driving 3 through pulse-width modulation port 0 (PWM0), and the output pin of the first FET chip for driving 3 is connected to the G pin of P-channel field-effect transistor (PEFT) pipe 4, and choking-winding 9 is charged; Embedded controller 2 is input to the input pin IN through the second FET chip for driving 5 through pulse-width modulation port one (PWM0) among Fig. 1; The output pin of the second FET chip for driving 5 is connected to the G pin of a N channel field-effect pipe 6, and choking-winding 9 is discharged; The S pin of P-channel field-effect transistor (PEFT) pipe 4 connects the S pin ground connection of power supply VDD 14, the one N channel field-effect pipes 6, and the D pin of the D pin of P-channel field-effect transistor (PEFT) pipe 4 and a N channel field-effect pipe 6 and an end of choking-winding 9 form a node; One fills one puts, and between P-channel field-effect transistor (PEFT) pipe 4, a N channel field-effect pipe 6 and choking-winding 9, forms concussion.Current sensor 7 is responsible for the electric current of induction through its copper cash; After amplifier 8 amplifies, supplying embedded controller 2 to carry out analog-to-digital conversion (ADC) samples; Compare computing with presetting electric current,, form a closed feedback loop through the PWM0 of change embedded controller 2 and the duty ratio of PWM1; Make the current constant that flows through choking-winding 9, reach the needed constant current of laser diode (predetermined current).Schottky diode 12 is the Schottky diode of reversal connection; It is the output that the A pin of Schottky diode 12 connects choking-winding 9; The K of Schottky diode 12 meets power supply VDD 14, mainly is in order to absorb the inverse electromotive force that choking-winding 9 produces, protection laser diode 13.
Laser for pulse pump; Use the utility model to be operated under the pulse mode; The IO port of embedded controller 2 outputs to the input pin of the 3rd FET chip for driving 10 among Fig. 1; The output pin of the 3rd FET chip for driving 10 is connected to the G pin of the 2nd N channel field-effect pipe 11, and the D pin of the 2nd N channel field-effect pipe 11 is connected to the output of choking-winding 9, the S pin ground connection of the 2nd N channel field-effect pipe 11.When the IO of embedded controller 2 output port output high level; " D " of the 2nd N channel field-effect pipe 11 and " S " conducting, constant electric current refluxes through the 2nd N channel field-effect pipe 11, will no longer include electric current on the laser diode 13 this moment and flow through; When the IO of embedded controller 2 output port output low level; The 2nd N channel field-effect pipe 11 " D " and " S " end, and electric current refluxes driving laser diode 13 through 13.Special in to eliminate the influence of thermal effect of pulse laser; When not needing bright dipping; Can through 10 controls the 2nd N channel field-effect pipe 11, apply a pulse base flow through the IO of embedded controller 2 port by the pulse of embedded controller 2 generation certain widths to laser diode.Pulse laser is in order to adapt to different input control frequencys; The embedded controller 2 of the utility model device is through looking into " frequency input signal-excitation pulse " form; To change the width of laser diode single current pulse by embedded controller 2;, change current time, thereby changed the pump power of individual pulse through the 3rd FET chip for driving 10 controls the 2nd N channel field-effect pipe 11 through the IO of embedded controller 2 port through laser diode 13; To guarantee the consistency of pulse laser individual pulse energy, Here it is the distinctive dynamic pulse duration modulation method of the utility model.
Laser for continuous pumping; The utility model is operated under the continuous mode; Control the 2nd N channel field-effect pipe 11 through the IO of embedded controller 2 port through the 3rd FET chip for driving 10 among Fig. 1; When " D " and " S " of the 2nd N channel field-effect pipe 11 ends, electric current all refluxes through laser diode 13, on laser diode 13, forms continuous constant current.
The utility model is intelligentized digital power supplies; Parameter in the power supply: predetermined current; Actual current; Parameters such as " frequency input signal-excitation pulse " form must be through digital communication mouth and miscellaneous equipment swap data, so the utility model added controller area network (CAN) bus, and " CANRX " receiving port of " CANTX " transmit port of embedded controller 2 and isolated form CAN communication module 1 links to each other in Fig. 1; " CANRX " receiving port of embedded controller 2 links to each other with " CANTX " transmit port of isolated form CAN communication module 1, and isolated form CAN communication module 1 is a transceiver of isolating with external equipment.
When powering on, through isolated form CAN communication module 1 inspection external equipment, wait for the temperature of laser diode, when conditions such as laser head temperature satisfied, this laser diode drive power is operate as normal, has protected equipment such as laser diode effectively.Just start under the situation that temperature allows.In start, under the situation of standby and shutdown, " D " of the 2nd N channel field-effect pipe 11 and " S " are in conducting state among Fig. 1, can protect laser diode 13 effectively.
Be an embodiment of the utility model below, this embodiment is that maximum voltage is 20V, and maximum current is the pulse and compatible continuously laser diode drive power of 120A.Wherein:
Embedded controller 2 adopts the LM3S2965 of TI, and this controller comprises hardware multiplier and a divider of 1 single command cycle, and has abundant interface; Comprise 12 ADC; The CAN bus, operating frequency is 50Mhz, includes 6 16 PWM pwm generators.Utilize the PWM0 of LM3S2965 and one group of pulse-width signal that PWM1 forms a band dead band; Be connected respectively to the UCC37322 chip for driving 3,5 by 2 TI companies through 17,16 pin, these two chip for driving are connected to 2 SUP75P05-08 of high-power FET and 3 FDP047AN08A0 compositions charge and discharge circuit; Choking-winding 9 to 2 180uH/60A discharges and recharges; The PWM of LM3S2965 is controlled by the current value that is detected choking-winding 9 by the LA100-P current sensor 7 of LEM company, and after TLE2804 amplifier 8 amplifications through TI company, the digital-to-analogue conversion mouth ADC0 (pin one) that sends into LM3S2965 samples; This embedded controller 2 compares with the predetermined current value; Value relatively is related with PWM, forms a close loop negative feedback circuit, makes the choking-winding loop remain preset current value.
The input/output port PB0 (pin 66) that utilizes LM3S2965 is as input; After external pulse signal rising edge arrives; Utilize the timer internal TIMER2 of LM3S2965; Record the difference that arrives with last pulse signal, calculate the frequency of current external pulse signal, obtain the time that current laser diode needs bright dipping through looking into " pulse frequency-output pulse width "; Control 3 high-power FET FDP047AN08A0 of UCC37322 chip for driving driving of TI company through the PB1 (67 pin) of LM3S2965; FDP047AN08A0 is ended, let electric current pass through laser diode and luminous, fluorescent lifetime is exactly that the time that " pulse frequency-output pulse width " obtains is looked in our front.
Adopt the isolated can bus module CTM8250T of Zhou Ligong; Link to each other with CAN0RX (pin 10) with the CAN0TX (pin 11) of LM3S2965, the predetermined current of present embodiment, data such as current actual current are all through the CTM8250T input and output; Also can change the mode of operation of this product through this interface; When breaking down, present embodiment can be used as main frame and sends immediately through CTM8250T, supplies the miscellaneous part response in the laser.
The pulse mode of present embodiment can use the duty ratio at 0-100%, and applies threshold current, and the operating voltage of laser diode is from 1.3V～20V, and electric current reaches 120A most.Pulse frequency is up to 100kHz, and rising edge is that 2.5us-10us is adjustable.
This power supply is through facts have proved, the Current Control precision is at 0.01A (Max.120A), and stability is at ± 0.5% (Max.120A); Be applied on continuous wave laser and the pulse laser, the laser stabilization degree improves a lot, and particularly on pulse laser, adjusts with dynamic pulsewidth through applying torrent, and the consistent performance of the single pulse energy of laser is reached ± 1%.
Claims (2)
1. laser diode drive power; It is characterized in that constituting by embedded controller (2), three FET chip for driving, P-channel field-effect transistor (PEFT) pipe, two N channel field-effect pipes, current sensor (7), amplifier (8), choking-winding (9) and Schottky diodes (12); The first pulse-width modulation port (0) of described embedded controller (2) connects the input pin of the first FET chip for driving (3); The output pin of this first FET chip for driving (3) connects the G pin of P-channel field-effect transistor (PEFT) pipe (4), and the S pin of this P-channel field-effect transistor (PEFT) pipe (4) connects the positive pole of power supply VDD (14);
The second pulse-width modulation port (1) of described embedded controller (2) connects the input pin of the second FET chip for driving (5); The output pin of the second FET chip for driving (5) connects the G pin of a N channel field-effect pipe (6), the S pin ground connection of a N channel field-effect pipe (6);
One end of the pin of the D of the D pin of described P-channel field-effect transistor (PEFT) pipe (4) and a described N channel field-effect pipe (6) and choking-winding (9) forms node; The D pin of the input of the A pin of the other end of this choking-winding (9) and Schottky diode (12), laser diode (13), the 2nd N channel field-effect pipe (11) forms node, and the K pin of described Schottky diode (12) connects the positive pole of power supply VDD (14);
On the pin of the S of the D pin of described P-channel field-effect transistor (PEFT) pipe (4) and a described N channel field-effect pipe (6) and the circuit between the described streamline circle (9), be provided with current sensor (7), the output of this current sensor (7) links to each other with described embedded controller (2) signal input part through amplifier (8);
The IO port of described embedded controller (2) links to each other the pin ground connection of the S of the 2nd N channel field-effect pipe (11) through the 3rd FET chip for driving (10) with the G pin of described the 2nd N channel field-effect pipe (11).
2. laser diode drive power according to claim 1 is characterized in that described embedded controller (2) also links to each other with isolated form CAN communication module (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202987575U CN202221868U (en) | 2011-08-17 | 2011-08-17 | Laser diode driving power source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202987575U CN202221868U (en) | 2011-08-17 | 2011-08-17 | Laser diode driving power source |
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| Publication Number | Publication Date |
|---|---|
| CN202221868U true CN202221868U (en) | 2012-05-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011202987575U Expired - Fee Related CN202221868U (en) | 2011-08-17 | 2011-08-17 | Laser diode driving power source |
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| CN (1) | CN202221868U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108258578A (en) * | 2017-12-18 | 2018-07-06 | 北京空间机电研究所 | A kind of full-digital control laser power supply and control method |
| US10361537B2 (en) | 2017-10-23 | 2019-07-23 | Microsoft Technology Licensing, Llc | Dynamic supply voltage control circuit for laser diode |
| US10658814B2 (en) | 2017-10-23 | 2020-05-19 | Microsoft Technology Licensing, Llc | Laser diode priming to reduce latency |
-
2011
- 2011-08-17 CN CN2011202987575U patent/CN202221868U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10361537B2 (en) | 2017-10-23 | 2019-07-23 | Microsoft Technology Licensing, Llc | Dynamic supply voltage control circuit for laser diode |
| US10658814B2 (en) | 2017-10-23 | 2020-05-19 | Microsoft Technology Licensing, Llc | Laser diode priming to reduce latency |
| CN108258578A (en) * | 2017-12-18 | 2018-07-06 | 北京空间机电研究所 | A kind of full-digital control laser power supply and control method |
| CN108258578B (en) * | 2017-12-18 | 2019-08-09 | 北京空间机电研究所 | A kind of full-digital control laser power supply and control method |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120516 Termination date: 20120817 |