CN103390856A - Method for controlling stability of output currents at power-on stage of laser driving circuit - Google Patents
Method for controlling stability of output currents at power-on stage of laser driving circuit Download PDFInfo
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- CN103390856A CN103390856A CN2013103002659A CN201310300265A CN103390856A CN 103390856 A CN103390856 A CN 103390856A CN 2013103002659 A CN2013103002659 A CN 2013103002659A CN 201310300265 A CN201310300265 A CN 201310300265A CN 103390856 A CN103390856 A CN 103390856A
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Abstract
The invention relates to a method for controlling stability of output currents at the power-on stage of a laser driving circuit. Current stability controlling is achieved through a power-on module of the laser driving circuit. The power-on module comprises a trimmable clock circuit, a power-on control circuit and a power-on driving circuit. The method improves period consistency of different chip clock circuits by aid of the digital trimming technology; controls the power-on time of the power-on driving circuit by aid of the power-on control circuit; drives a back end circuit through the power-on driving circuit, constructs a feedback loop and forms the stable control state. The method effectively improves consistency of power-on time of different laser driving circuits, and solves the problem of output current oscillating due to power-on time difference during parallel-connection application of multiple driving chips. The driving mode that the control circuit to control the driving circuit is introduced, the driving circuit is set to be in the low power consumption state after the circuits are stabilized, and therefore power consumption of the whole chip in the stable working period is reduced.
Description
Technical field
The present invention relates to a kind of power on method of stage outputting current steadily of drive circuit for laser of controlling, belong to the drive circuit for laser technical field.
Background technology
Monolithic Integrated Laser Driving Circuit provides the large electric current of an appointment for the outer laser of sheet.Output current is larger, and the driving force that needs in the chip enable power up is larger, and start-up course is more difficult.Present stage, monolithic integrated laser drive circuit output current magnitude was hundred milliamperes of ranks, need high driving force in power up, when driving force is not enough, output current can produce the process of a stepped rising, just reach specified drive current after the time that experience is grown, cause whole electro-optical system to work.
For enough driving forces are provided in power up, the power consumption of drive circuit is generally higher.But drive circuit is also the part of signal path, and therefore, after the feedback control loop that laser drive circuit forms entered stable state, drive circuit was also working on, thereby increases the power consumption during whole chip steady-working state.
In actual applications,, in order to reach larger driving force, two chips parallel connections can be used, thus the upper limit of raising output current.during use chip in parallel, the synchronism that powers on to two chips requires very high, if two chip power asynchronism(-nization) steps, will produce serious stability problem: after a chip power is completed and reached steady-working state, another chip current is also unstable, at this moment, the rear output current of stablizing chip is also continuing variation, the electric current of this variation will feed back to the input signal of first stablizing chip, thereby cause that the state of first stablizing chip changes, thereby the output current of first stablizing chip is changed, the rest may be inferred, thereby output current is vibrated for a long time, can't reach stable state, make outputting current steadily receive great impact, thereby electro-optical system can't be worked.
Summary of the invention
The object of the invention is to overcome the above-mentioned deficiency of prior art, a kind of power on method of stage outputting current steadily of drive circuit for laser of controlling is provided, power on while having solved the drive circuit for laser High-current output problem of driving force deficiency of the method, do not increase the power consumption under chip steady operation condition simultaneously; Solve the current oscillation problem that between different batches, the chip power Time Inconsistency causes, improved the reliability and stability during output current powers on.
Above-mentioned purpose of the present invention mainly is achieved by following technical solution:
A kind of power on method of stage outputting current steadily of drive circuit for laser of controlling, the module that powers on by drive circuit for laser realizes, the described module that powers on comprises overriding clock circuit, electrifying control circuit and upper electric drive circuit, wherein overriding clock circuit comprises output comparator, periodic Control comparator, shaping circuit, buffer and clock cycle controller, upper electric drive circuit comprises signal amplifier and the booster amplifier that powers on, and concrete methods of realizing is as follows:
Step (one), the control signal 1 of exporting by drive circuit for laser are controlled overriding clock circuit output adjustable clock signal of cycle, and the clock signal that the cycle is adjustable exports to electrifying control circuit, and concrete grammar is as follows:
(1) the clock cycle controller receives the control signal 1 of drive circuit for laser output and high level or the low level clock signal of periodic Control comparator output, postpone according to 1 pair of described high level signal of control signal or low level signal, simultaneously described high level signal is converted to low level signal or described low level signal is converted to high level signal, and the low level signal after changing or high level signal are exported to periodic Control comparator and output comparator simultaneously;
(2) periodic Control comparator low level signal or the high level signal that will receive exported to the clock cycle controller again, the clock cycle controller postpones according to 1 pair of described low level signal of control signal or high level signal from drive circuit for laser output, simultaneously described low level signal is converted to high level signal or described high level signal is converted to low level signal, and the signal after changing is exported to periodic Control comparator and output comparator again simultaneously, the like, thereby form the adjustable clock signal of cycle that high level signal and low level signal replace,
(3) the output comparator adjustable clock signal of cycle that will receive is in real time exported to shaping circuit, shaping circuit is adjusted the duty ratio of clock signal, obtain duty ratio and be 50% clock signal, and the clock signal after adjusting is exported to electrifying control circuit;
Step (two), electrifying control circuit receive the clock signal of shaping circuit output in overriding clock circuit, clock signal is carried out frequency division process, and the clock signal after frequency division is processed is as the control signal 2 of upper electric drive circuit;
Step (three), upper electric drive circuit receive pilot signal and the reference voltage of drive circuit for laser output, under the control of control signal 2, the difference of described pilot signal and reference voltage are amplified, and concrete grammar is as follows:
(5), the initial time that powers on, the booster amplifier that powers on receives the control signal 2 of electrifying control circuit output, receive simultaneously the reference voltage of the pilot signal of drive circuit for laser output, the booster amplifier that powers on amplifies the difference of pilot signal and reference voltage under the control action of control signal 2, and the signal after amplifying is exported to drive circuit for laser; Signal amplifier receives pilot signal and the reference voltage of drive circuit for laser output, the difference of pilot signal and reference voltage is amplified, and the signal after amplifying is exported to drive circuit for laser;
(6), after powering on and finishing, booster amplifier power cut-off under the control action of control signal 2 powers on, signal amplifier still receives pilot signal and the reference voltage of drive circuit for laser output, difference to pilot signal and reference voltage is amplified, and the signal after amplifying is exported to drive circuit for laser.
In above-mentioned control drive circuit for laser powered on the method for stage outputting current steadily, electrifying control circuit was comprised of the adjustable frequency divider of frequency dividing ratio.
In above-mentioned control drive circuit for laser powered on the method for stage outputting current steadily, in step (), the circular error of adjustable clock signal of overriding clock circuit output cycle was reduced in 0.05us.
In above-mentioned control drive circuit for laser powers on the method for stage outputting current steadily, clock signal after in (3) of step (), shaping circuit will be adjusted is exported to upper electric control module by buffer, wherein buffer is by increasing pull-up current or the pull-down current of clock signal, to improve the driving force of clock signal.
The present invention compared with prior art has following beneficial effect:
(1), the present invention has carried out innovative design to the module that powers in drive circuit for laser, the module that powers on that employing is comprised of overriding clock circuit, electrifying control circuit and upper electric drive circuit, by the power on electric current output in stage of the module controls drive circuit that powers on, the problem of the driving force deficiency that powers on while having solved the drive circuit for laser High-current output, do not increase the power consumption under chip steady operation condition simultaneously; Solve the current oscillation problem that between different batches, the chip power Time Inconsistency causes, improved the reliability and stability during output current powers on;
(2), the overriding clock circuit of the present invention is controlled the impedance of clock cycle controller by the control signal 1 of input, change the delay of periodic Control comparator output signal, thereby realize that clock signal period is adjustable, by adopting numeral to trim technology, different batches clock signal chip circular error is reduced in 0.05u the current oscillation problem that has produced while having solved multi-chip application in parallel;
(3), the present invention adopts the upper electric drive circuit that is comprised of signal amplifier and the booster amplifier that powers on, in power up, drive circuit uses many driver modules to drive, the problem of solution driving force deficiency under the High-current output condition, simultaneously by the control signal 2 that produced by electrifying control circuit after outputting current steadily on electric drive circuit control, the power consumption in reduction under the electric drive circuit stable state.
Description of drawings
Fig. 1 is the present invention's module fundamental diagram that powers on;
Fig. 2 is the present invention's overriding clock circuit structural representation in module that powers on;
Fig. 3 is the present invention's electrifying control circuit structural representation in module that powers on;
Fig. 4 is the present invention's driving circuit structure schematic diagram that powers on that powers in module.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
The present invention controls the power on method of stage outputting current steadily of drive circuit for laser and realizes by the module that powers on drive circuit for laser, be illustrated in figure 1 as the present invention's module fundamental diagram that powers on, the module that powers on as seen from the figure comprises overriding clock circuit, electrifying control circuit and upper electric drive circuit.
Be illustrated in figure 2 as the present invention's overriding clock circuit structural representation in module that powers on, overriding clock circuit comprises output comparator, periodic Control comparator, shaping circuit, buffer and clock cycle controller as seen from the figure, the output comparator normal phase input end is connected with the normal phase input end of periodic Control comparator, and with the clock cycle controller output signal, be connected, the output comparator inverting input is connected with the inverting input of periodic Control comparator, and with external fixed bias voltage, is connected; The shaping circuit input is connected with the output comparator output signal; The buffer input is connected with the shaping circuit output signal, the output clock signal; Clock cycle controller input is connected with the periodic Control comparator output signal, and the clock cycle controller output signal is connected with periodic Control comparator normal phase input end with output comparator, forms and encircles the loop that shakes.
Overriding clock circuit receives the adjustable clock signal of 1 generation cycle of control signal of drive circuit for laser output, and the clock signal that the cycle is adjustable exports to electrifying control circuit, and the specific works process is following:
(1) the clock cycle controller receives the control signal 1 of drive circuit for laser output and the clock signal (high level clock signal or low level clock signal) of periodic Control comparator output, postpone according to 1 pair of clock signal of control signal, simultaneously clock signal is changed, if that is: high level signal is converted to low level signal, if low level signal is converted to high level signal, and the clock signal after changing (low level signal or high level signal) is exported to periodic Control comparator and output comparator simultaneously.
(2) periodic Control comparator low level signal or the high level signal that will receive exported to the clock cycle controller again, the clock cycle controller postpones according to 1 pair of low level signal of control signal or high level signal from drive circuit for laser output, simultaneously low level signal is converted to high level signal or high level signal is converted to low level signal, and the signal after changing is exported to periodic Control comparator and output comparator again simultaneously, the like, constantly circulation, thereby form the adjustable clock signal of cycle that high level signal and low level signal replace.
(3) simultaneously the output comparator adjustable clock signal of cycle that will receive is in real time exported to shaping circuit, and shaping circuit is adjusted the duty ratio of clock signal, obtain duty ratio and be 50% clock signal, and the clock signal after adjusting is exported to buffer;
(4) buffer receives the clock signal after adjusting, and by increasing pull-up current or the pull-down current of clock signal, to improve the driving force of clock signal, buffer is exported to electrifying control circuit with clock signal afterwards.
The circular error of the clock signal that the overriding clock circuit output cycle of the present invention is adjustable is reduced in 0.05us.
Be illustrated in figure 3 as the present invention's electrifying control circuit structural representation in module that powers on, electrifying control circuit is comprised of the adjustable frequency divider of frequency dividing ratio, can form as shown in Figure 32,4,8,16,32, the 64 adjustable frequency dividers of difference, adopt 64 frequency dividers in the present embodiment.Electrifying control circuit receives the clock signal of buffer output in overriding clock circuit, clock signal is carried out 64 frequency divisions process, and the clock signal after frequency division is processed is exported to electric drive circuit as the control signal 2 of upper electric drive circuit.
Be illustrated in figure 4 as the present invention's driving circuit structure schematic diagram that powers on that powers in module, going up as seen from the figure electric drive circuit comprises signal amplifier and powers on booster amplifier, the signal amplifier normal phase input end is connected with the booster amplifier normal phase input end that powers on, and external reference voltage signal, the signal amplifier inverting input is connected with the booster amplifier inverting input that powers on, and the external inspecting signal, output signal provides the driving signal for drive circuit for laser.Whether the booster amplifier that powers on works is controlled by control signal 2, and pilot signal and reference signal are exported to respectively signal amplifier and powered on booster amplifier.Pilot signal and reference signal are provided by the drive circuit for laser front end.
Upper electric drive circuit receives pilot signal and the reference voltage of drive circuit for laser output, under the control of control signal 2, the difference of pilot signal and reference voltage is amplified, and the specific works process is as follows:
(1), initial time powers on, the booster amplifier that powers on receives the control signal 2 of electrifying control circuit output, receive simultaneously the reference voltage of the pilot signal of drive circuit for laser output, the booster amplifier that powers on amplifies the difference of pilot signal and reference voltage under the control action of control signal 2, and the signal after amplifying is exported to drive circuit for laser, signal amplifier receives pilot signal and the reference voltage of drive circuit for laser output, difference to pilot signal and reference voltage is amplified, and the signal after amplifying is exported to drive circuit for laser.
(2), after powering on and finishing, booster amplifier power cut-off under the control action of control signal 2 powers on, signal amplifier still receives pilot signal and the reference voltage of drive circuit for laser output, difference to pilot signal and reference voltage is amplified, and the signal after amplifying is exported to drive circuit for laser.
Be all to work in the whole process of signal amplifier after power up and the end that powers on, the booster amplifier that powers on is only worked in power up.
Utilize control signal that electrifying control circuit generates to control the driving force of upper electric drive circuit, the output signal of drive circuit is set up rapidly, the formation control stable state, and reduce the driving force of drive circuit after stable state is set up, reduce power consumption.
As shown in Figure 1, the first step of the present invention: overriding clock circuit is trimmed, improve the consistency of each chip clock cycle; Second step: arrange the clock signal after trimming is carried out frequency division according to the external world, electric drive circuit in control; The 3rd step: under the control of electrifying control circuit, by upper electric drive circuit output drive signal, back-end circuit is driven, and reduce the power consumption of drive circuit after having powered on.
The above; only be the embodiment of the best of the present invention, but protection scope of the present invention is not limited to this, anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement, within all should being encompassed in protection scope of the present invention.
The content that is not described in detail in specification of the present invention belongs to this area professional and technical personnel's known technology.
Claims (4)
1. control the power on method of stage outputting current steadily of drive circuit for laser for one kind, it is characterized in that: the module that powers on by drive circuit for laser realizes, the described module that powers on comprises overriding clock circuit, electrifying control circuit and upper electric drive circuit, wherein overriding clock circuit comprises output comparator, periodic Control comparator, shaping circuit, buffer and clock cycle controller, upper electric drive circuit comprises signal amplifier and the booster amplifier that powers on, and concrete methods of realizing is as follows:
Step (one), the control signal 1 of exporting by drive circuit for laser are controlled overriding clock circuit output adjustable clock signal of cycle, and the clock signal that the cycle is adjustable exports to electrifying control circuit, and concrete grammar is as follows:
(1) the clock cycle controller receives the control signal 1 of drive circuit for laser output and high level or the low level clock signal of periodic Control comparator output, postpone according to 1 pair of described high level signal of control signal or low level signal, simultaneously described high level signal is converted to low level signal or described low level signal is converted to high level signal, and the low level signal after changing or high level signal are exported to periodic Control comparator and output comparator simultaneously;
(2) periodic Control comparator low level signal or the high level signal that will receive exported to the clock cycle controller again, the clock cycle controller postpones according to 1 pair of described low level signal of control signal or high level signal from drive circuit for laser output, simultaneously described low level signal is converted to high level signal or described high level signal is converted to low level signal, and the signal after changing is exported to periodic Control comparator and output comparator again simultaneously, the like, thereby form the adjustable clock signal of cycle that high level signal and low level signal replace,
(3) the output comparator adjustable clock signal of cycle that will receive is in real time exported to shaping circuit, shaping circuit is adjusted the duty ratio of clock signal, obtain duty ratio and be 50% clock signal, and the clock signal after adjusting is exported to electrifying control circuit;
Step (two), electrifying control circuit receive the clock signal of shaping circuit output in overriding clock circuit, clock signal is carried out frequency division process, and the clock signal after frequency division is processed is as the control signal 2 of upper electric drive circuit;
Step (three), upper electric drive circuit receive pilot signal and the reference voltage of drive circuit for laser output, under the control of control signal 2, the difference of described pilot signal and reference voltage are amplified, and concrete grammar is as follows:
(5), the initial time that powers on, the booster amplifier that powers on receives the control signal 2 of electrifying control circuit output, receive simultaneously the reference voltage of the pilot signal of drive circuit for laser output, the booster amplifier that powers on amplifies the difference of pilot signal and reference voltage under the control action of control signal 2, and the signal after amplifying is exported to drive circuit for laser; Signal amplifier receives pilot signal and the reference voltage of drive circuit for laser output, the difference of pilot signal and reference voltage is amplified, and the signal after amplifying is exported to drive circuit for laser;
(6), after powering on and finishing, booster amplifier power cut-off under the control action of control signal 2 powers on, signal amplifier still receives pilot signal and the reference voltage of drive circuit for laser output, difference to pilot signal and reference voltage is amplified, and the signal after amplifying is exported to drive circuit for laser.
2. a kind of power on method of stage outputting current steadily of drive circuit for laser of controlling according to claim 1, it is characterized in that: described electrifying control circuit is comprised of the adjustable frequency divider of frequency dividing ratio.
3. a kind of power on method of stage outputting current steadily of drive circuit for laser of controlling according to claim 1 is characterized in that: in described step (), the circular error of adjustable clock signal of overriding clock circuit output cycle is reduced in 0.05us.
4. a kind of power on method of stage outputting current steadily of drive circuit for laser of controlling according to claim 1, it is characterized in that: the clock signal after in (3) of described step (), shaping circuit will be adjusted is exported to upper electric control module by buffer, wherein buffer is by increasing pull-up current or the pull-down current of clock signal, to improve the driving force of clock signal.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310300265.9A CN103390856B (en) | 2013-07-15 | 2013-07-15 | A kind of method controlling drive circuit for laser power up phase outputting current steadily |
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| CN201310300265.9A CN103390856B (en) | 2013-07-15 | 2013-07-15 | A kind of method controlling drive circuit for laser power up phase outputting current steadily |
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| CN103390856B CN103390856B (en) | 2015-12-09 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108363449A (en) * | 2018-04-12 | 2018-08-03 | 西安应用光学研究所 | A kind of dual system electrifying control circuit and its control method |
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| JPH11353684A (en) * | 1998-06-10 | 1999-12-24 | Nippon Columbia Co Ltd | Semiconductor laser controller |
| JP2000313135A (en) * | 1999-04-30 | 2000-11-14 | Sharp Corp | Image forming apparatus |
| US20050105569A1 (en) * | 2003-11-14 | 2005-05-19 | Hisashi Senga | Laser control unit, laser control circuit, and laser-power adjustment method |
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| CN102014315A (en) * | 2010-09-15 | 2011-04-13 | 索尔思光电（成都）有限公司 | Rapid wavelength stabilization method for optical dense wave division multiplexing |
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2013
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH11353684A (en) * | 1998-06-10 | 1999-12-24 | Nippon Columbia Co Ltd | Semiconductor laser controller |
| JP2000313135A (en) * | 1999-04-30 | 2000-11-14 | Sharp Corp | Image forming apparatus |
| US20070092177A1 (en) * | 2001-10-09 | 2007-04-26 | Infinera Corporation | WAVELENGTH LOCKING AND POWER CONTROL SYSTEMS FOR MULTI-CHANNEL PHOTONIC INTEGRATED CIRCUITS (PICs) |
| US20050105569A1 (en) * | 2003-11-14 | 2005-05-19 | Hisashi Senga | Laser control unit, laser control circuit, and laser-power adjustment method |
| CN102014315A (en) * | 2010-09-15 | 2011-04-13 | 索尔思光电（成都）有限公司 | Rapid wavelength stabilization method for optical dense wave division multiplexing |
Non-Patent Citations (1)
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| 王汉祥 等: "一种高可靠性上电复位芯片的设计", 《现代电子技术》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108363449A (en) * | 2018-04-12 | 2018-08-03 | 西安应用光学研究所 | A kind of dual system electrifying control circuit and its control method |
| CN108363449B (en) * | 2018-04-12 | 2020-01-14 | 西安应用光学研究所 | Dual-system power-on control circuit and control method thereof |
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| CN103390856B (en) | 2015-12-09 |
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