CN201247906Y - DC drive circuit structure for high-power laser - Google Patents
DC drive circuit structure for high-power laser Download PDFInfo
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- CN201247906Y CN201247906Y CNU2008201504138U CN200820150413U CN201247906Y CN 201247906 Y CN201247906 Y CN 201247906Y CN U2008201504138 U CNU2008201504138 U CN U2008201504138U CN 200820150413 U CN200820150413 U CN 200820150413U CN 201247906 Y CN201247906 Y CN 201247906Y
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Abstract
The utility model relates to a DC-driven circuit structure in a high-power laser, which comprises an external control signal input terminal/ a square wave generating function module, a power-driven function module and a filtering function module, wherein the external control signal input terminal is connected with a laser function circuit through the square wave generating function module, the power-driven function module and the filtering function module. With the structure, the DC-driven circuit structure can realize highly efficient and stable control function, and obtain high current driving capability and low ripple; a driving laser has high stability, the current can be adjusted and controlled in a large range through a control signal CS, and the whole circuit has high conversion efficiency; the control signal CS is connected with a current detecting circuit to realize that a stable current source forms a constant current source output by constant current; and the signal CS is connected with an output power detection circuit to realize a constant output power circuit. The utility model has the advantages of stable and reliable working state, high efficiency and practicality, and wider range of application.
Description
Technical field
The utility model relates to field of photoelectric technology, and particularly laser dc drive circuit technical field specifically is meant the dc drive circuit structure in a kind of high power laser.
Background technology
At present, semiconductor laser has been widely used in many fields such as information communication, medical treatment and military affairs.Along with the continuous development of technology is also more and more higher to the power requirement of laser, the thing followed is that requirement drives efficiently to high power laser is reliable and stable.Because drive circuit for laser is the most important components of laser system.This also just requires the lifting of the performance of corresponding high power laser drive circuit.The method of Laser Drive employing for now all is to use MOSFET, and large power triode, or the driving of power amplifier see also shown in Figure 1.(during general drive current＜1A) is a kind of feasible effective method to these drive circuits driving low-power laser, but drive high power laser (general drive current〉2A, even reach more than tens amperes) time, because it is very big to flow through the electric current of device, and generally these devices are controlled the linear amplification district that output current all is operated in device for convenience.Because the semiconductor device inherent characteristic, when singly working in linear zone, the device pressure drop is very big, and this also is to adopt these devices to be used for the reason of Control current: the electric current of controlling output by the pressure drop of device itself.
But in high power laser drove, because electric current is very big, if the device pressure drop is too big, then the power consumption of device own was very big, can cause following problem:
(1) caloric value of device own is very big, and is very high to the heat radiation requirement of system;
(2) long term device is at high temperature worked, and the life-span of device reduces;
(3) the power supply power demand is big, and efficient is low;
(4) under extreme case, just be difficult to accomplish big current drives at all.
The utility model content
The purpose of this utility model is to have overcome above-mentioned shortcoming of the prior art, provides a kind of power output that can effectively control laser, circuit power consumption is less, stable working state is reliable, highly effective, the scope of application dc drive circuit structure in the high power laser comparatively widely.
In order to realize above-mentioned purpose, the dc drive circuit structure in the high power laser of the present utility model has following formation:
Dc drive circuit structure in this high power laser, comprise the external control signal input, its main feature is, comprise square wave generation functional module, power drive functional module and filter function module in the described circuit structure, described external control signal input is connected with the laser functional circuit by described square wave generation functional module, power drive functional module and filter function module successively.
Square wave generation functional module in the dc drive circuit structure in this high power laser can be current switch reshaper, PWM generator or single-chip microcomputer square-wave generator.
Single-chip microcomputer square-wave generator in the dc drive circuit structure in this high power laser is a LTC3729 square wave generation functional chip.
Power drive functional module in the dc drive circuit structure in this high power laser can be MOSFET field effect transistor current switching circuit or pliotron current switching circuit.
MOSFET field effect transistor current switching circuit in the dc drive circuit structure in this high power laser comprises first field effect transistor, second field effect transistor, the 3rd field effect transistor and the 4th field effect transistor, described first field effect transistor and second field effect transistor series connection cross-over connection are between power supply and ground, described the 3rd field effect transistor and the 4th field effect transistor are also connected cross-over connection between power supply and ground, described first field effect transistor, second field effect transistor, the grid of the 3rd field effect transistor and the 4th field effect transistor is connected with the output of square wave generation functional module respectively, the input of described filter function module is connected between described first field effect transistor and second field effect transistor, and the input of described filter function module also is connected between described the 3rd field effect transistor and the 4th field effect transistor.
Also comprise the first voltage-stabilizing protection diode and the second voltage-stabilizing protection diode in the MOSFET field effect transistor current switching circuit in the dc drive circuit structure in this high power laser; the plus earth of the described first voltage-stabilizing protection diode; its negative pole is connected between first field effect transistor and second field effect transistor; the plus earth of the described second voltage-stabilizing protection diode, its negative pole are connected between the 3rd field effect transistor and the 4th field effect transistor.
Filter function module in the dc drive circuit structure in this high power laser can be LC filter circuit or RC filter circuit.
LC filter circuit in the dc drive circuit structure in this high power laser comprises first inductance, second inductance, first electric capacity and second electric capacity, described first inductance and the first capacitances in series cross-over connection are between the output and ground of described power drive functional module, described second inductance and second electric capacity are also connected cross-over connection between the output and ground of described power drive functional module, the input of described laser functional circuit is connected between described first inductance and first electric capacity, and the input of described laser functional circuit also is connected between described second inductance and second electric capacity.
Adopted the dc drive circuit structure in the high power laser of this utility model, because power device wherein is operated in the saturation region, reduce the pressure drop of device itself, thereby reduced the power consumption of device, work in the saturation region simultaneously, make device only open and close two kinds of operating states,, cross the electrical power of device with control flows by the time that a controlled square-wave generator comes control device to open and close.Simultaneously by a LC filtering system, the big current signal of switch is filtered into stable heavy DC, with this direct current diffluence drive laser, can realize controlled function, and it is efficient, the switching device power consumption is little, the laser drive current of stable DC simultaneously, and obtain the driving force of big electric current, make it possible to realize big electric current output, can reach the 20A direct current, realize low ripple simultaneously, ripple＜1%, and realized the stability of drive laser＜± 0.1dB, and electric current can adjust controlledly, realized the adjustment of electric current on a large scale of 0.5～20A by control signal (CS), simultaneously the entire circuit conversion efficiency〉80%; In addition, the CS control signal is received galvanometer circuit, realized that stable current source forms the constant-current source of constant current output; The CS signal is received ouput power detection circuit, realized the circuit of permanent power output, stable working state is reliable, highly effective, and the scope of application is comparatively extensive.
Description of drawings
Fig. 1 is a conventional laser device drive circuit schematic diagram of the prior art.
Fig. 2 is the functional module theory diagram of the dc drive circuit structure in the high power laser of the present utility model.
Fig. 3 is the circuit theory diagrams of the dc drive circuit structure in the high power laser of the present utility model.
Embodiment
In order more to be expressly understood technology contents of the present utility model, describe in detail especially exemplified by following examples.
See also shown in Figure 1, dc drive circuit structure in this high power laser, comprise external control signal CS input, wherein, comprise square wave generation functional module SS, power drive functional module IS and filter function module FT in the described circuit structure, described external control signal input is connected with laser functional circuit LD by described square wave generation functional module, power drive functional module and filter function module successively.
Wherein, described square wave generation functional module can be current switch reshaper, PWM generator or single-chip microcomputer square-wave generator, and this single-chip microcomputer square-wave generator can adopt the LTC3729 square wave generation functional chip of Linear company.
Simultaneously, described power drive functional module can be MOSFET field effect transistor current switching circuit or pliotron current switching circuit.
Wherein, described MOSFET field effect transistor current switching circuit comprises the first field effect transistor M1, the second field effect transistor M2, the 3rd field effect transistor M3 and the 4th field effect transistor M4, described first field effect transistor M1 and second field effect transistor M2 series connection cross-over connection are between power supply and ground, described the 3rd field effect transistor M3 and the 4th field effect transistor M4 also connect cross-over connection between power supply and ground, the described first field effect transistor M1, the second field effect transistor M2, the grid of the 3rd field effect transistor M3 and the 4th field effect transistor M4 is connected with the output of square wave generation functional module respectively, the input of described filter function module is connected between the described first field effect transistor M1 and the second field effect transistor M2, and the input of described filter function module also is connected between described the 3rd field effect transistor M3 and the 4th field effect transistor M4.
Moreover; can also comprise the first voltage-stabilizing protection diode D1 and the second voltage-stabilizing protection diode D2 in this MOSFET field effect transistor current switching circuit; the plus earth of the described first voltage-stabilizing protection diode D1; its negative pole is connected between the first field effect transistor M1 and the second field effect transistor M2; the plus earth of the described second voltage-stabilizing protection diode D2, its negative pole are connected between the 3rd field effect transistor M3 and the 4th field effect transistor M4.
Simultaneously, described filter function module can be LC filter circuit or RC filter circuit.
Wherein, this LC filter circuit comprises first inductance L 1, second inductance L, 2 first electric capacity and second electric capacity, described first inductance L 1 and the first capacitances in series cross-over connection are between the output and ground of described power drive functional module, described second inductance L 2 and second electric capacity are also connected cross-over connection between the output and ground of described power drive functional module, the input of described laser functional circuit is connected between described first inductance L 1 and first electric capacity, and the input of described laser functional circuit also is connected between described second inductance L 2 and second electric capacity.
In the middle of practical application, because the driving of laser needs low noise stable constant-current driving, the utility model is exactly by the high-power electric current switching device of the accurate control of square-wave generator being reached the purpose of the big current drives electric current of control, mode with switching pulse produces big electric current square wave, obtain the output of galvanic current stream by filtering to square wave, this duty cycle square wave can be by the input signal adjustment, and the size that can adjust output current by the adjustment duty ratio is used for the adjustable drive current of laser.
See also shown in Figure 1ly, control signal CS wherein according to the circuit of the square-wave generator of selecting, can be voltage signal, current signal or digital signal.Control signal CS controlling party wave producer SS, square-wave generator sends the duty ratio of square-wave signal according to deciding of control signal, if require drive current very big, it is very big then to export duty cycle square wave, otherwise very little if drive current needs, then square-wave generator output duty cycle square wave is very little.
The high level and the low level time of the square wave that square-wave generator drive current power switch IS, current power switching device send here according to square-wave generator come switch power supply current.That is to say: what send here when square-wave generator is that switch I S opens in the time of high level, and electric current passes through; Otherwise if low level, then switch I S turn-offs, and no current passes through.
The switching current of sending by high-current switch IS, wave network FT after filtration, the big current filtering with its switch becomes the galvanic current source, supplies with laser LD, thereby realizes the driving of the little ripple direct current of laser.
See also shown in Figure 2 again:
The CS control signal---be the outside voltage signal of sending here herein, the voltage height, system's output current is big; Otherwise the low output current of voltage is little.This input signal includes but not limited to simultaneously: analog voltage signal, analog current signal or digital signal.
The SS square-wave generator---adopt the LTC3729 chip of Linear company to produce square-wave signal, the CS signal connects the EAIN pin of LTC3279.This square-wave generator is the core devices in the utility model simultaneously, and this square-wave generator includes but not limited to: current switch reshaper, PWM generator, single-chip microcomputer and other square-wave generator.
The IS current switch---adopt 4 high-power MOS tubes to realize that M1, M3 select the IRF7811W of IRF company for use, M2, M4 select the IRF7822 of IRF company for use, and D1 and D2 adopt UP5840 for the protection diode.This power drive device can be but be not limited to: the device of MOSFET, pliotron or other voltage control output current.
The FT filter circuit---adopt the 1000 μ F of 2 0.8 μ H20A inductance and 2 parallel connections withstand voltage〉alminium electrolytic condenser of 16V constitutes the LC filter.This filter circuit includes but not limited to: LC filtering, RC filtering or other voltage filter circuit.
This scheme can provide the direct current of the low fluctuation (＜1%) of maximum 10A.The output power stability of the high power light source of circuit design is about ± 0.1dB according to this.
Adopted the dc drive circuit structure in the above-mentioned high power laser, because power device wherein is operated in the saturation region, reduce the pressure drop of device itself, thereby reduced the power consumption of device, work in the saturation region simultaneously, make device only open and close two kinds of operating states,, cross the electrical power of device with control flows by the time that a controlled square-wave generator comes control device to open and close.Simultaneously by a LC filtering system, the big current signal of switch is filtered into stable heavy DC, with this direct current diffluence drive laser, can realize controlled function, and it is efficient, the switching device power consumption is little, the laser drive current of stable DC simultaneously, and obtain the driving force of big electric current, make it possible to realize big electric current output, can reach the 20A direct current, realize low ripple simultaneously, ripple＜1%, and realized the stability of drive laser＜± 0.1dB, and electric current can adjust controlledly, realized the adjustment of electric current on a large scale of 0.5～20A by control signal (CS), simultaneously the entire circuit conversion efficiency〉80%; In addition, the CS control signal is received galvanometer circuit, realized that stable current source forms the constant-current source of constant current output; The CS signal is received ouput power detection circuit, realized the circuit of permanent power output, stable working state is reliable, highly effective, and the scope of application is comparatively extensive.
In this specification, the utility model is described with reference to its certain embodiments.But, still can make various modifications and conversion obviously and not deviate from spirit and scope of the present utility model.Therefore, specification and accompanying drawing are regarded in an illustrative, rather than a restrictive.
Claims (8)
1, the dc drive circuit structure in a kind of high power laser, comprise the external control signal input, it is characterized in that, comprise square wave generation functional module, power drive functional module and filter function module in the described circuit structure, described external control signal input is connected with the laser functional circuit by described square wave generation functional module, power drive functional module and filter function module successively.
2, the dc drive circuit structure in the high power laser according to claim 1 is characterized in that, described square wave generation functional module is current switch reshaper, PWM generator or single-chip microcomputer square-wave generator.
3, the dc drive circuit structure in the high power laser according to claim 2 is characterized in that, described single-chip microcomputer square-wave generator is a LTC3729 square wave generation functional chip.
4, the dc drive circuit structure in the high power laser according to claim 1 is characterized in that, described power drive functional module is MOSFET field effect transistor current switching circuit or pliotron current switching circuit.
5, dc drive circuit structure in the high power laser according to claim 4, it is characterized in that, described MOSFET field effect transistor current switching circuit comprises first field effect transistor (M1), second field effect transistor (M2), the 3rd field effect transistor (M3) and the 4th field effect transistor (M4), described first field effect transistor (M1) and second field effect transistor (M2) series connection cross-over connection are between power supply and ground, described the 3rd field effect transistor (M3) and the 4th field effect transistor (M4) are also connected cross-over connection between power supply and ground, described first field effect transistor (M1), second field effect transistor (M2), the grid of the 3rd field effect transistor (M3) and the 4th field effect transistor (M4) is connected with the output of square wave generation functional module respectively, the input of described filter function module is connected between described first field effect transistor (M1) and second field effect transistor (M2), and the input of described filter function module also is connected between described the 3rd field effect transistor (M3) and the 4th field effect transistor (M4).
6, the dc drive circuit structure in the high power laser according to claim 5; it is characterized in that; also comprise the first voltage-stabilizing protection diode (D1) and the second voltage-stabilizing protection diode (D2) in the described MOSFET field effect transistor current switching circuit; the plus earth of the described first voltage-stabilizing protection diode (D1); its negative pole is connected between first field effect transistor (M1) and second field effect transistor (M2); the plus earth of the described second voltage-stabilizing protection diode (D2), its negative pole are connected between the 3rd field effect transistor (M3) and the 4th field effect transistor (M4).
According to the dc drive circuit structure in each described high power laser in the claim 1 to 6, it is characterized in that 7, described filter function module is LC filter circuit or RC filter circuit.
8, dc drive circuit structure in the high power laser according to claim 7, it is characterized in that, described LC filter circuit comprises first inductance (L1), second inductance (L2), first electric capacity and second electric capacity, described first inductance (L1) and the first capacitances in series cross-over connection are between the output and ground of described power drive functional module, described second inductance (L2) and second electric capacity are also connected cross-over connection between the output and ground of described power drive functional module, the input of described laser functional circuit is connected between described first inductance (L1) and first electric capacity, and the input of described laser functional circuit also is connected between described second inductance (L2) and second electric capacity.
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| Application Number | Priority Date | Filing Date | Title |
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| CNU2008201504138U CN201247906Y (en) | 2008-07-01 | 2008-07-01 | DC drive circuit structure for high-power laser |
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| Application Number | Priority Date | Filing Date | Title |
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| CNU2008201504138U CN201247906Y (en) | 2008-07-01 | 2008-07-01 | DC drive circuit structure for high-power laser |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102723868A (en) * | 2012-06-26 | 2012-10-10 | 深圳市大族激光科技股份有限公司 | Constant current source |
| CN106058627A (en) * | 2016-08-10 | 2016-10-26 | 东莞市金厚田光电有限公司 | Driving circuit of erbium-doped fiber laser |
| CN111721991A (en) * | 2020-06-04 | 2020-09-29 | 华帝股份有限公司 | Detection circuit for direct current variable frequency current |
| CN112189286A (en) * | 2018-05-21 | 2021-01-05 | 谷歌有限责任公司 | Switching circuit for burst mode tunable laser |
-
2008
- 2008-07-01 CN CNU2008201504138U patent/CN201247906Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102723868A (en) * | 2012-06-26 | 2012-10-10 | 深圳市大族激光科技股份有限公司 | Constant current source |
| CN102723868B (en) * | 2012-06-26 | 2014-11-05 | 深圳市大族激光科技股份有限公司 | Constant current source |
| CN106058627A (en) * | 2016-08-10 | 2016-10-26 | 东莞市金厚田光电有限公司 | Driving circuit of erbium-doped fiber laser |
| CN112189286A (en) * | 2018-05-21 | 2021-01-05 | 谷歌有限责任公司 | Switching circuit for burst mode tunable laser |
| CN111721991A (en) * | 2020-06-04 | 2020-09-29 | 华帝股份有限公司 | Detection circuit for direct current variable frequency current |
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Granted publication date: 20090527 Termination date: 20130701 |