CN105764177A - Driving method and driving circuit of laser in optical module - Google Patents
Driving method and driving circuit of laser in optical module Download PDFInfo
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- CN105764177A CN105764177A CN201410778568.6A CN201410778568A CN105764177A CN 105764177 A CN105764177 A CN 105764177A CN 201410778568 A CN201410778568 A CN 201410778568A CN 105764177 A CN105764177 A CN 105764177A
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Abstract
The present invention relates to the technical field of laser driving and particularly relates to a driving method and a driving circuit of a laser in an optical module. The driving method and the driving circuit are used for providing driving voltage to the laser and further reducing the loss of a laser circuit. In the embodiment of the invention, the method comprise the steps of obtaining constant current source current voltage, comparing the constant current source current voltage and reference voltage, the reference voltage is not smaller than constant current source lowest working voltage, and the output voltage of the power supply circuit is adjusted according to a comparison result. Since a constant current source plays a voltage adjustment role in an optical module working circuit so as to ensure the normal working of the laser, the reference voltage can ensure the normal working of the constant current source, and the output voltage of the power supply circuit is adjusted according to the relation between the constant current source current voltage and the reference voltage. Compared with the prior art, according to the driving method and the driving circuit, the normal working of the constant current source can be ensured, the voltage of two ends of the constant current source is reduced, and the purpose of saving power consumption is realized.
Description
Technical field
The present invention relates to Laser Driven technical field, particularly relate to driving method and the drive circuit of laser instrument in a kind of optical module.
Background technology
Optical module adopts the medium that the optical signal that laser instrument sends transmits as data.
Fig. 1 is a kind of optical module operating circuit structural representation in prior art.As it is shown in figure 1, optical module operating circuit includes the power supply circuits, laser instrument and the constant-current source that are cascaded.Concrete, laser instrument 102 one end is connected with power supply circuits 101, and the other end is connected with constant-current source 104, and the electric current of constant-current source 104 output is flowed back in the earth by earth terminal 105.Wherein, power supply circuits provide running voltage for laser instrument and constant-current source, and constant-current source adjusts the current/voltage in loop.
The factor such as aging of the variations in temperature of laser instrument and laser instrument can make the voltage drop at laser instrument two ends change, in order to ensure the normal luminous of laser instrument, power supply circuits of the prior art are that optical module operating circuit provides bigger voltage, concrete, the voltage change range of laser instrument is 0.7V 2.0V, the minimum running voltage of constant-current source is 0.2V, and the voltage that power supply circuits provide is 3.3V.
The voltage that power supply circuits provide is much larger than the running voltage of laser instrument, in order to ensure laser instrument normal operation, constant-current source plays voltage-regulation effect in optical module operating circuit, the excess voltage that power supply circuits provide is undertaken by constant-current source, but excess voltage is more than the minimum running voltage of constant-current source, which results in power consumption waste on constant-current source.
Summary of the invention
The embodiment of the present invention provides driving method and the drive circuit of laser instrument in a kind of optical module, with thinking that laser instrument provides driving voltage, reduces the loss of optical module operating circuit further.
The embodiment of the present invention provides the driving method of laser instrument in a kind of optical module, comprises the following steps:
Obtaining constant-current source current voltage, constant-current source is for adjusting the electric current of flowing through laser；
The relatively magnitude relationship of constant-current source current voltage and reference voltage, reference voltage is not less than the minimum running voltage of constant-current source；
Adjust the output voltage of power supply circuits according to comparative result, power supply circuits are for powering to constant-current source and laser instrument.
The embodiment of the present invention provides the drive circuit of laser instrument in a kind of optical module, including:
Acquiring unit, is used for obtaining constant-current source current voltage, and constant-current source is for adjusting the electric current of flowing through laser；
Processing unit, for comparing the magnitude relationship of constant-current source current voltage and reference voltage, reference voltage is not less than the minimum running voltage of constant-current source；Adjust the output voltage of power supply circuits according to comparative result, power supply circuits are for powering to constant-current source and laser instrument.
In the embodiment of the present invention, power supply circuits are for powering to constant-current source and laser instrument, constant-current source plays voltage-regulation effect in optical module operating circuit, to ensure laser instrument normal operation, reference voltage ensure that constant-current source normal operation, magnitude relationship according to constant-current source current voltage with reference voltage adjusts the output voltage of power supply circuits, regulate the voltage at constant-current source two ends, compared with prior art, constant-current source and laser instrument normal operation can not only be ensured, and reduce the voltage at constant-current source two ends, it is achieved that reduce the purpose of optical module operating circuit loss.
Accompanying drawing explanation
Fig. 1 is a kind of optical module operating circuit structural representation that prior art is suitable for；
Fig. 2 is the schematic diagram of the optical module operating circuit that the embodiment of the present invention is suitable for；
The schematic flow sheet of the driving method of laser instrument in a kind of optical module that Fig. 3 provides for the embodiment of the present invention；
The structural representation of the drive circuit of laser instrument in a kind of optical module that Fig. 4 provides for the embodiment of the present invention；
The structural representation of the drive circuit of laser instrument in a kind of optical module that Fig. 5 provides for the embodiment of the present invention.
Detailed description of the invention
In optical module operating circuit, owing to the temperature on laser instrument can raise along with the growth of working time, voltage drop can raise along with temperature and change, thus causing that minimum current threshold value required on laser instrument can increase along with the rising of temperature；Further as the factor such as aging of laser instrument, the voltage drop also resulting in laser instrument two ends changes, and therefore constant-current source electric current in the required loop maintained under different temperature conditions is also different.Constant-current source can regulate the current value in whole loop according to the size of electric current required in loop whole under Current Temperatures.And different laser instrument, voltage drop is also different, therefore, in order to ensure that laser instrument can normal operation, then need to ensure the voltage sum that the voltage of power supply circuits is all higher than needed for laser instrument and constant-current source in the whole work process of laser instrument, therefore, what generally arranged by the voltage of power supply circuits in prior art is bigger.And now, the voltage of power supply circuits arrange bigger time, voltage drop on laser instrument is less, will loss relatively multivoltage on this loop.The embodiment of the present invention provides driving method and the drive circuit of laser instrument in a kind of optical module, with thinking that laser instrument provides driving voltage, reduces the loss of laser circuit further.
Fig. 2 illustrates the schematic diagram of the optical module operating circuit that the embodiment of the present invention is suitable for.
As in figure 2 it is shown, the optical module operating circuit schematic diagram that the embodiment of the present invention is suitable for.Including power supply circuits 201, laser instrument 202, constant-current source 203.Laser instrument and constant-current source are connected in drive circuit, and the constant-current source other end connects earth terminal 204.Electric current, from power supply circuits flowing through laser, flows back to the earth after constant-current source.Laser instrument 202 connects constant-current source 203 by the pin ISNK205 on driver chip 206.
Power supply circuits are for powering to described laser instrument, in the embodiment of the present invention, power supply circuits select high-low voltage power source DC-DC power supply circuits, being dynamically adapted the supply voltage in drive circuit, those skilled in the art also can select other power supply circuits according to practical situation, and the embodiment of the present invention does not limit.
Constant-current source is used for the electric current adjusting in the drive circuit of drive circuit for laser, so that electric current is in steady statue, constant-current source regulates the electric current in drive circuit based on feedback mechanism, specific works principle is: constant-current source and laser instrument are connected in drive circuit, assume that the electric current needed for laser instrument normal operation is current threshold, Constant current source sense to the current flow of drive circuit more than current threshold time, the equivalent resistance of self is heightened by constant-current source, so that the electric current in drive circuit reduces, until being approximately equal to current threshold；When the current flow of Constant current source sense to drive circuit is less than current threshold, the equivalent resistance of self is turned down by constant-current source, so that the electric current in drive circuit increases, until being approximately equal to current threshold.Constant-current source is additionally operable to after power supply circuits have adjusted output voltage every time, adjusts the electric current in drive circuit, makes the electric current in drive circuit be approximately equal to current threshold, and make whole drive circuit tend towards stability.
There is current threshold in laser instrument, when the electric current of flowing through laser is more than this current threshold, laser instrument is then in normal operating conditions, and namely laser instrument produces and keeps light to export.The power of the light of laser instrument output depends on the amplitude driving electric current, and user can regulate, according to the intensity of concrete required light, the size driving electric current.Current threshold temperature influence, when temperature raises, current threshold also can raise, and now, the driving electric current needed for laser instrument is then more high, and the pressure drop on laser instrument is then more big.
The electric current of power supply circuits output flows into constant-current source after laser instrument, and constant-current source is in order to adjust the electric current of whole drive circuit, it is ensured that the current constant of drive circuit, and is maintained in required scope.Power supply circuits the voltage of confession consume after a part through laser instrument, remaining amount is carried on constant-current source.Skilled person will appreciate that, it is advantageous to, constant-current source is arranged in driver chip.Laser instrument and constant-current source are attached by the ISNK pin of driver chip.
Namely the embodiment of the present invention is powered to laser instrument by power supply circuits, driver chip detects described constant-current source current voltage, and generate control signal according to the magnitude relationship of constant-current source current voltage with reference voltage, power supply circuits adjust output voltage according to described control signal, and reference voltage is not less than the minimum running voltage of described constant-current source.
Owing to reference voltage is not less than the minimum running voltage of described constant-current source, therefore by detecting the magnitude relationship of constant-current source current voltage and reference voltage, can be seen that the magnitude relationship of constant-current source current voltage and the minimum running voltage of constant-current source, the output voltage of power supply circuits is dynamically adjusted according further to this magnitude relationship, thus can make the output voltage of power supply circuits close to but be not less than the voltage needed for constant-current source and laser instrument normal operation, it is achieved thereby that while ensureing the minimum running voltage that the output voltage of power supply circuits is not less than constant-current source, farthest reduce the loss in drive circuit.
In order to make the purpose of the present invention, technical scheme and beneficial effect clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein is only in order to explain the present invention, is not intended to limit the present invention.
Fig. 3 illustrates the schematic flow sheet of the driving method of laser instrument in a kind of optical module that the embodiment of the present invention provides.
Based on the operating circuit schematic diagram shown in Fig. 2, Fig. 3 illustrates the schematic flow sheet of the driving method of laser instrument in a kind of optical module that the embodiment of the present invention provides, the embodiment of the present invention is provided the driving method of laser instrument in a kind of optical module, comprises the following steps:
Step 301, obtains constant-current source current voltage, and described constant-current source is for adjusting the electric current of flowing through laser, so that the electric current of flowing through laser is in steady statue；
Step 302, the relatively magnitude relationship of described constant-current source current voltage and reference voltage, described reference voltage is not less than the minimum running voltage of described constant-current source；
Step 303, adjusts the output voltage of power supply circuits according to comparative result, and described power supply circuits are for powering to described constant-current source and described laser instrument.
In a kind of optical module that the embodiment of the present invention provides, the driving method of laser instrument is applied to optical module operating circuit, the drive circuit of optical module operating circuit includes laser instrument, power supply circuits for powering to laser instrument, and for adjusting the constant-current source of drive circuit electric current.It is also preferred that the left power supply circuits can by various ways, for instance can be DC-DC.It is also preferred that the left constant-current source is arranged in driver chip.
It is also preferred that the left in above-mentioned steps 301, obtain constant-current source current voltage by the mode detected.In above-mentioned steps 303, first can generate control signal according to comparative result；Sending control signals to power supply circuits afterwards, control signal is used for indicating power supply circuits to adjust output voltage according to control signal.It is also preferred that the left the device performing the method flow process may be provided in driver chip, it is possible to be arranged in other component, the embodiment of the present invention is introduced being arranged in driver chip, but is not limited to this.
In such scheme, in order to improve the promptness of detection, the driver chip in the embodiment of the present invention detects constant-current source current voltage in real time, and in another kind of implementation, driver chip also can be periodically detected the voltage on constant-current source.The embodiment of the present invention does not limit.
In being embodied as, arranging the reference voltage of constant-current source in advance in driver chip, reference voltage is not less than the minimum running voltage of constant-current source.It is also preferred that the left the minimum running voltage slightly above constant-current source that generally reference voltage can be arranged, to prevent the electric current minimum running voltage lower than constant-current source, improve safety.When the minimum running voltage of conventional constant-current source is 0.2V, the reference voltage of constant-current source may be configured as 0.2V to 0.5V.
It is also preferred that the left relatively whether described constant-current source current voltage and the absolute value of the difference of described reference voltage are more than threshold value, if so, then adjust the output voltage of described power supply circuits according to comparative result.One preferably implementation is: driver chip detects constant-current source current voltage, and compare the magnitude relationship of constant-current source current voltage and reference voltage, driver chip judges that whether the constant-current source current voltage absolute value with the difference of reference voltage is more than threshold value, if so, then control signal is generated according to comparative result.
Specifically, when driver chip detects the current voltage of constant-current source more than or less than the reference voltage of constant-current source, determine whether that whether the constant-current source current voltage absolute value with the difference of reference voltage is more than threshold value, if the absolute value of the difference of constant-current source current voltage and reference voltage is more than threshold value, then illustrate that constant-current source current voltage differs relatively big with reference voltage, now regulate the output voltage of power supply circuits according to this comparative result.And when constant-current source current voltage and the difference of reference voltage absolute value less than or during less than or equal to threshold value, then illustrate that constant-current source current voltage and reference voltage are more or less the same, now the output voltage of power supply circuits do not made any adjustments.
Another kind preferably implementation is, when driver chip detects the current voltage in stream source more than the reference voltage of constant-current source, determine whether that whether the constant-current source current voltage absolute value with the difference of reference voltage is more than threshold value, if the absolute value of the difference of constant-current source current voltage and reference voltage is more than threshold value, then illustrate that constant-current source current voltage differs bigger with reference voltage, now regeneration control signal, should regulate the output voltage of power supply circuits according to this control signal.And when driver chip detects the current voltage in stream source less than the reference voltage of constant-current source, then illustrate that current supply voltage is too small, the normal working voltage of drive circuit can not be met, now no longer judge the constant-current source current voltage absolute value with the difference of reference voltage and the relation of threshold value, directly the output voltage of power supply circuits is adjusted.
By above-mentioned preferably mode, filtered out the absolute value of constant-current source current voltage and the difference of reference voltage less than or situation during less than or equal to threshold value, it is to avoid owing to frequently adjusting the circuit oscillation that power supply circuits cause, more optimize this programme.
Further, if described constant-current source current voltage is more than described reference voltage, then the output voltage of power supply circuits is turned down according to comparative result；If described constant-current source current voltage is less than described reference voltage, then heighten the output voltage of power supply circuits according to comparative result.
If it is also preferred that the left described constant-current source current voltage is more than described reference voltage, and the absolute value of the difference of described constant-current source current voltage and described reference voltage is more than threshold value, then turn down the output voltage of power supply circuits according to comparative result；If described constant-current source current voltage is less than described reference voltage, then heighten the output voltage of power supply circuits according to comparative result.
One preferably implementation is, if constant-current source current voltage is more than reference voltage, then generates the first control signal, and the first control signal is used for indicating power supply circuits to turn down output voltage；If constant-current source current voltage is less than reference voltage, then generating the second control signal, the second control signal is used for indicating power supply circuits to heighten output voltage.If constant-current source current voltage is equal to reference voltage, then not sending any signal, power supply circuits do not regulate output voltage.When constant-current source current voltage is more than reference voltage, and the absolute value of constant-current source current voltage and the difference of reference voltage more than threshold value time, generate the first control signal, the first control signal is used for indicating power supply circuits to turn down output voltage.If constant-current source current voltage is less than reference voltage, and the absolute value of constant-current source current voltage and the difference of reference voltage more than threshold value time, then generate the second control signal, the second control signal is used for indicating power supply circuits to heighten output voltage.
In being embodied as, a kind of implementation is, when regulating the output voltage of power supply circuits, once the output voltage of power supply circuits is adjusted a step-length, such as, if described constant-current source current voltage is more than described reference voltage, then according to comparative result, the output voltage of power supply circuits is turned down a step-length；If described constant-current source current voltage is less than described reference voltage, then according to comparative result, the output voltage of power supply circuits is heightened a step-length.
In another kind of implementation, when being adjusted the output voltage of power supply circuits in implementation by control signal mode, the first control signal is used for indicating power supply circuits that output voltage is turned down a step-length；Second control signal is used for indicating power supply circuits that output voltage is heightened a step-length.
Giving one example, one step-length of driver chip inner setting, it is assumed that this step-length is 0.1V, then the first control signal that driver sends is for making power supply circuits that output voltage is heightened 0.1V.Second control signal is used for indicating power supply circuits that output voltage is turned down 0.1V.
Another embodiment is, if the absolute value of the difference of described constant-current source current voltage and described reference voltage is more than threshold value, then adjust the output voltage of described power supply circuits so that the absolute value of the running voltage of described constant-current source and the difference of reference voltage is not more than threshold value.It is also preferred that the left adjust the output voltage of described power supply circuits so that the running voltage of described constant-current source and the difference of reference voltage are equal to zero.Preferably, adjust the output voltage of described power supply circuits, make the running voltage of described constant-current source and the difference of reference voltage more than zero, and less than threshold value, now the running voltage of constant-current source is more than reference voltage, and the difference of the running voltage of constant-current source and reference voltage is in threshold range, in order to make constant-current source be in normal operating conditions, and effectively reduce the power consumption of drive circuit.
When driver chip judges constant-current source current voltage more than reference voltage, then calculating the first difference of constant-current source current voltage and reference voltage, this first difference is fed back to power supply circuits, output voltage is reduced the first difference by power supply circuits.When driver chip judges constant-current source current voltage less than reference voltage, then calculating the second difference of constant-current source current voltage and reference voltage, this second difference is fed back to power supply circuits, output voltage is improved the second difference by power supply circuits.Detailed description of the invention can have multiple, but user oneself is determined according to practical situation,
Can effectively be reduced the power consumption of drive circuit by said method, now give one example to set forth said method.
Assuming that the reference voltage on constant-current source is 0.2V, the running voltage of laser instrument is 1.3V, sets threshold value as 0.1V, and a step-length of power supply circuits Voltage Cortrol is 0.1V.Assuming that first time powers 1.8V by power supply circuits, now, in real work, the running voltage on constant-current source is the difference of 1.8V and 1.3V, for 0.5V, it is seen that constant-current source present operating voltage 0.5V is significantly greater than the reference voltage 0.2V on constant-current source.And the difference of the reference voltage of constant-current source present operating voltage and constant-current source is 0.3V, hence it is evident that more than threshold value 0.1V.Driver chip, according to this comparative result, generates control signal, and this control signal requires that output voltage is reduced a step-length by power supply circuits.After power supply circuits receive this control signal, output voltage is adjusted to 1.7V, and again carries out detection judgement.
Until output voltage is turned down to 1.6V by power supply circuits.The running voltage that now constant-current source is current is 0.3V, constant-current source present operating voltage 0.3V is more than reference voltage 0.2V, but the difference of the running voltage that constant-current source is current and reference voltage is 0.1V, equal to threshold value 0.1V, therefore, now think that the voltage that power supply circuits export meets the requirements, do not adjust the output voltage of power supply circuits.
In the above example, it is assumed that the electric current in loop is 100mA, then the product that total power consumption is 1.6V and 100mA of the output of the power supply circuits after regulating, for 0.16W, the actual power loss in laser instrument is the product of 1.3V and 100mA, for 0.13W.Visible, during relative to laser instrument supply voltage 3.3V, loss is greatly reduced.
The method that the embodiment of the present invention provides another have the beneficial effect that, when laser instrument in the course of the work, cause that the threshold current of laser instrument raises owing to temperature raises, and then when making the pressure drop on laser instrument increase, and then cause that the real work voltage on constant-current source is less than reference voltage, now driver chip can heighten the output voltage of power supply circuits according to said method.
Output voltage can be dynamically adjusted further as the power supply circuits in the embodiment of the present invention, and owing to the operational voltage value of different laser instrument is also different, therefore when being suitable for the method provided in the embodiment of the present invention, even if having changed laser instrument, the supply voltage that the power supply circuits in the embodiment of the present invention provide also can meet the voltage needed for laser instrument and constant-current source normal operation.
The embodiment of the present invention may also provide another embodiment, namely detect the current voltage in constant-current source and laser instrument simultaneously, when judging the current voltage sum of constant-current source and laser instrument more than or less than the minimum voltage sum ensureing normal operation needed for this constant-current source and laser instrument, adjust the output voltage of power supply circuits.
In the embodiment of the present invention suitable in the driving method of the laser instrument of optical module, obtain constant-current source current voltage, the relatively magnitude relationship of constant-current source current voltage and reference voltage, reference voltage is not less than the minimum running voltage of constant-current source, adjusts the output voltage of power supply circuits according to comparative result.
Owing to constant-current source plays voltage-regulation effect in optical module operating circuit, to ensure laser instrument normal operation, reference voltage ensure that constant-current source normal operation, magnitude relationship according to constant-current source current voltage with reference voltage adjusts the output voltage of power supply circuits, compared with prior art, constant-current source normal operation can not only be ensured, and reduce the voltage at constant-current source two ends, it is achieved that save the purpose of power consumption.
Fig. 4 illustrates the structural representation of the drive circuit of laser instrument in a kind of optical module that the embodiment of the present invention provides.
Based on identical design, the structural representation of the drive circuit of laser instrument in a kind of optical module that the embodiment of the present invention provides, as shown in Figure 4, including drive circuit 401 and feedback circuit 402, drive circuit 401 include laser instrument 403, in the power supply circuits 404 powered to laser instrument and laser-driven chip for adjusting the constant-current source 405 of drive circuit electric current, feedback circuit 402 includes:
Acquiring unit 406, is used for obtaining constant-current source current voltage, and constant-current source is for adjusting the electric current of flowing through laser, so that the electric current of flowing through laser is in steady statue；
Processing unit 407, for comparing the magnitude relationship of constant-current source current voltage and reference voltage, reference voltage is not less than the minimum running voltage of constant-current source；Adjust the output voltage of power supply circuits according to comparative result, power supply circuits are for powering to constant-current source and laser instrument.
It is also preferred that the left processing unit 407, specifically for:
Relatively whether constant-current source current voltage and the absolute value of the difference of reference voltage be more than threshold value, if so, then adjusts the output voltage of power supply circuits according to comparative result.
It is also preferred that the left processing unit 407, specifically for:
If constant-current source current voltage is more than reference voltage, then turn down the output voltage of power supply circuits according to comparative result；If constant-current source current voltage is less than reference voltage, then heighten the output voltage of power supply circuits according to comparative result.
It is also preferred that the left processing unit 407, specifically for:
If the absolute value of the difference of constant-current source current voltage and reference voltage is more than threshold value, then adjust the output voltage of power supply circuits so that the absolute value of the running voltage of constant-current source and the difference of reference voltage is not more than threshold value.
It is also preferred that the left power supply circuits are high-low voltage power source DC-DC.
In the embodiment of the present invention suitable in the driving method of the laser instrument of optical module, obtain constant-current source current voltage, the relatively magnitude relationship of constant-current source current voltage and reference voltage, reference voltage is not less than the minimum running voltage of constant-current source, adjusts the output voltage of power supply circuits according to comparative result.
Owing to constant-current source plays voltage-regulation effect in optical module operating circuit, to ensure laser instrument normal operation, reference voltage ensure that constant-current source normal operation, magnitude relationship according to constant-current source current voltage with reference voltage adjusts the output voltage of power supply circuits, compared with prior art, constant-current source normal operation can not only be ensured, and reduce the voltage at constant-current source two ends, it is achieved that save the purpose of power consumption.
Fig. 5 illustrates the structural representation of the drive circuit of laser instrument in a kind of optical module that the embodiment of the present invention provides.
Based on identical design, the structural representation of the drive circuit of laser instrument in a kind of optical module that the embodiment of the present invention provides, as shown in Figure 5, including drive circuit 501 and feedback circuit 502, drive circuit 501 include laser instrument 503, in the power supply circuits 504 powered to laser instrument and laser-driven chip for adjusting the constant-current source 505 of drive circuit electric current, feedback circuit 502 includes:
Testing circuit 506, is used for obtaining constant-current source current voltage, and constant-current source is for adjusting the electric current of flowing through laser, so that the electric current of flowing through laser is in steady statue；
Mistake comparator 507, for comparing the magnitude relationship of constant-current source current voltage and reference voltage, reference voltage is not less than the minimum running voltage of constant-current source；
Logic controller 508, for adjusting the output voltage of power supply circuits according to comparative result, power supply circuits are for powering to constant-current source and laser instrument.
In Figure 5, the structure of the drive circuit 501 of drive circuit for laser is: the output electric current of power supply circuits 504 is through laser instrument 503, the electric current of laser instrument 503 output connects constant-current source 505 through the ISNK pin 514 of driver chip, and the electric current of constant-current source 505 output enters the earth by the earth terminal 512 of driver chip.
The feedback circuit 502 of drive circuit for laser includes: testing circuit obtains the present operating voltage on constant-current source 505 at ISNK pin 514 place, and the present operating voltage on the constant-current source 505 detected is transferred to mistake comparator 507, one end ground connection in first power supply 509, one end provides reference voltage to mistake comparator 507.When the reference voltage that mistake comparator 507 receives the present operating voltage of constant-current source 505 of testing circuit 506 output and the first power supply 509 provides, the present operating voltage of constant-current source and the size of reference voltage are compared, and the difference of the present operating voltage of constant-current source with reference voltage is inputted to trigger 511, second source 510 one end ground connection, the other end provides threshold value, trigger 511 to compare the magnitude relationship of the present operating voltage of the constant-current source absolute value with the difference of reference voltage and threshold value to trigger 511.If after the comparison of mistake comparator 507 and trigger 511, it has been found that need to adjust voltage, then comparative result is converted to level signal input to logic controller 508 by trigger.The control signal of adjustment, after judging, is transferred to power supply circuits 504 by feedback end 513 by logic controller 508.
In being embodied as, arranging the reference voltage of constant-current source in advance in driver chip, reference voltage is not less than the minimum running voltage of constant-current source.It is also preferred that the left the minimum running voltage slightly above constant-current source that generally reference voltage can be arranged, to prevent the electric current minimum running voltage lower than constant-current source, improve safety.When the minimum running voltage of conventional constant-current source is 0.2V, the reference voltage of constant-current source may be configured as 0.2V to 0.5V.
It is also preferred that the left relatively whether described constant-current source current voltage and the absolute value of the difference of described reference voltage are more than threshold value, if so, then adjust the output voltage of described power supply circuits according to comparative result.One preferably implementation is, whether mistake comparator compares the constant-current source current voltage absolute value with the difference of reference voltage more than threshold value；If the absolute value of the difference of constant-current source current voltage and reference voltage is greater than threshold value, then logic controller generates control signal according to comparative result.
Specifically, when driver chip detects the current voltage of constant-current source more than or less than the reference voltage of constant-current source, determine whether that whether the constant-current source current voltage absolute value with the difference of reference voltage is more than threshold value, if the absolute value of the difference of constant-current source current voltage and reference voltage is more than threshold value, then illustrate that constant-current source current voltage differs bigger with reference voltage, now regeneration control signal, should regulate the output voltage of power supply circuits according to this control signal.And when constant-current source current voltage and the difference of reference voltage absolute value less than or during less than or equal to threshold value, then illustrate that constant-current source current voltage and reference voltage are more or less the same, now the output voltage of power supply circuits do not made any adjustments.
Another kind preferably implementation is, when driver chip detects the current voltage in stream source more than the reference voltage of constant-current source, determine whether that whether the constant-current source current voltage absolute value with the difference of reference voltage is more than threshold value, if the absolute value of the difference of constant-current source current voltage and reference voltage is more than threshold value, then illustrate that constant-current source current voltage differs bigger with reference voltage, now regeneration control signal, should regulate the output voltage of power supply circuits according to this control signal.And when driver chip detects the current voltage in stream source less than the reference voltage of constant-current source, then illustrate that current supply voltage is too small, the normal working voltage of drive circuit can not be met, now no longer judge the constant-current source current voltage absolute value with the difference of reference voltage and the relation of threshold value, directly the output voltage of power supply circuits is adjusted.
By above-mentioned preferably mode, filtered out the absolute value of constant-current source current voltage and the difference of reference voltage less than or situation during less than or equal to threshold value, it is to avoid owing to frequently adjusting the circuit oscillation that power supply circuits cause, more optimize this programme.
Further, if described constant-current source current voltage is more than described reference voltage, then the output voltage of power supply circuits is turned down according to comparative result；If described constant-current source current voltage is less than described reference voltage, then heighten the output voltage of power supply circuits according to comparative result.
If it is also preferred that the left described constant-current source current voltage is more than described reference voltage, and the absolute value of the difference of described constant-current source current voltage and described reference voltage is more than threshold value, then turn down the output voltage of power supply circuits according to comparative result；If described constant-current source current voltage is less than described reference voltage, then heighten the output voltage of power supply circuits according to comparative result.
One preferably implementation is, if constant-current source current voltage is more than reference voltage, then generates the first control signal, and the first control signal is used for indicating power supply circuits to turn down output voltage；If constant-current source current voltage is less than reference voltage, then generating the second control signal, the second control signal is used for indicating power supply circuits to heighten output voltage.If constant-current source current voltage is equal to reference voltage, then not sending any signal, power supply circuits do not regulate output voltage.When constant-current source current voltage is more than reference voltage, and the absolute value of constant-current source current voltage and the difference of reference voltage more than threshold value time, generate the first control signal, the first control signal is used for indicating power supply circuits to turn down output voltage.If constant-current source current voltage is less than reference voltage, and the absolute value of constant-current source current voltage and the difference of reference voltage more than threshold value time, then generate the second control signal, the second control signal is used for indicating power supply circuits to heighten output voltage.
In being embodied as, the first control signal is used for indicating power supply circuits that output voltage is turned down a step-length；Second control signal is used for indicating power supply circuits that output voltage is heightened a step-length.
Giving one example, one step-length of driver chip inner setting, it is assumed that this step-length is 0.1V, then the first control signal that driver sends is for making power supply circuits that output voltage is heightened 0.1V.Second control signal is used for indicating power supply circuits that output voltage is turned down 0.1V.
Another embodiment is, when driver chip judges constant-current source current voltage more than reference voltage, then calculating the first difference of constant-current source current voltage and reference voltage, this first difference is fed back to power supply circuits, output voltage is reduced the first difference by power supply circuits.When driver chip judges constant-current source current voltage less than reference voltage, then calculating the second difference of constant-current source current voltage and reference voltage, this second difference is fed back to power supply circuits, output voltage is improved the second difference by power supply circuits.Detailed description of the invention can have multiple, but user oneself is determined according to practical situation.
The method that the embodiment of the present invention provides another have the beneficial effect that, when laser instrument in the course of the work, cause that the threshold current of laser instrument raises owing to temperature raises, and then when making the pressure drop on laser instrument increase, and then cause that the real work voltage on constant-current source is less than reference voltage, now driver chip can heighten the output voltage of power supply circuits according to said method.
Output voltage can be dynamically adjusted further as the power supply circuits in the embodiment of the present invention, and owing to the operational voltage value of different laser instrument is also different, therefore when being suitable for the method provided in the embodiment of the present invention, even if having changed laser instrument, the supply voltage that the power supply circuits in the embodiment of the present invention provide also can meet the voltage needed for laser instrument and constant-current source normal operation.
The embodiment of the present invention may also provide another embodiment, namely detect the current voltage in constant-current source and laser instrument simultaneously, when judging the current voltage sum of constant-current source and laser instrument more than or less than the minimum voltage sum ensureing normal operation needed for this constant-current source and laser instrument, adjust the output voltage of power supply circuits.
The drive circuit of the drive circuit for laser in the embodiment of the present invention include laser instrument, in the power supply circuits powered to described laser instrument and laser-driven chip for adjusting the constant-current source of described drive circuit electric current, powered to laser instrument by power supply circuits, driver chip detects described constant-current source current voltage, and generate control signal according to the magnitude relationship of constant-current source current voltage with reference voltage, power supply circuits adjust output voltage according to described control signal, and reference voltage is not less than the minimum running voltage of described constant-current source.
Owing to constant-current source, laser instrument and power supply circuits are in drive circuit, therefore power supply circuits the voltage of confession after the actual pressure drop of laser instrument, be added on constant-current source, when the supply voltage of power supply circuits is bigger, the voltage on constant-current source is also relatively big, and vice versa.It is not less than the minimum running voltage of described constant-current source further as reference voltage, therefore by detecting the magnitude relationship of constant-current source current voltage and reference voltage, can be seen that the magnitude relationship of constant-current source current voltage and the minimum running voltage of constant-current source, the output voltage of power supply circuits is dynamically adjusted according further to this magnitude relationship, thus can make the output voltage of power supply circuits close to but be not less than the voltage needed for constant-current source and laser instrument normal operation, it is achieved thereby that while ensureing the minimum running voltage that the output voltage of power supply circuits is not less than constant-current source, farthest reduce the loss in drive circuit.
It can be seen from the above: the drive circuit of the drive circuit for laser in the embodiment of the present invention include laser instrument, in the power supply circuits powered to described laser instrument and laser-driven chip for adjusting the constant-current source of described drive circuit electric current, powered to laser instrument by power supply circuits, driver chip detects described constant-current source current voltage, and generate control signal according to the magnitude relationship of constant-current source current voltage with reference voltage, power supply circuits adjust output voltage according to described control signal, and reference voltage is not less than the minimum running voltage of described constant-current source.
Owing to constant-current source, laser instrument and power supply circuits are in drive circuit, therefore power supply circuits the voltage of confession after the actual pressure drop of laser instrument, be added on constant-current source, when the supply voltage of power supply circuits is bigger, the voltage on constant-current source is also relatively big, and vice versa.It is not less than the minimum running voltage of described constant-current source further as reference voltage, therefore by detecting the magnitude relationship of constant-current source current voltage and reference voltage, can be seen that the magnitude relationship of constant-current source current voltage and the minimum running voltage of constant-current source, the output voltage of power supply circuits is dynamically adjusted according further to this magnitude relationship, thus can make the output voltage of power supply circuits close to but be not less than the voltage needed for constant-current source and laser instrument normal operation, it is achieved thereby that while ensureing the minimum running voltage that the output voltage of power supply circuits is not less than constant-current source, farthest reduce the loss in drive circuit.
Those skilled in the art are it should be appreciated that embodiments of the invention can be provided as method or computer program.Therefore, the present invention can adopt the form of complete hardware embodiment, complete software implementation or the embodiment in conjunction with software and hardware aspect.And, the present invention can adopt in one or more forms including the upper computer program implemented of the computer-usable storage medium (including but not limited to disk memory, CD-ROM, optical memory etc.) having computer usable program code.
The present invention is that flow chart and/or block diagram with reference to method according to embodiments of the present invention, equipment (system) and computer program describe.It should be understood that can by the combination of the flow process in each flow process in computer program instructions flowchart and/or block diagram and/or square frame and flow chart and/or block diagram and/or square frame.These computer program instructions can be provided to produce a machine to the processor of general purpose computer, special-purpose computer, Embedded Processor or other programmable data processing device so that the instruction performed by the processor of computer or other programmable data processing device is produced for realizing the device of function specified in one flow process of flow chart or multiple flow process and/or one square frame of block diagram or multiple square frame.
These computer program instructions may be alternatively stored in and can guide in the computer-readable memory that computer or other programmable data processing device work in a specific way, the instruction making to be stored in this computer-readable memory produces to include the manufacture of command device, and this command device realizes the function specified in one flow process of flow chart or multiple flow process and/or one square frame of block diagram or multiple square frame.
These computer program instructions also can be loaded in computer or other programmable data processing device, make on computer or other programmable devices, to perform sequence of operations step to produce computer implemented process, thus the instruction performed on computer or other programmable devices provides for realizing the step of function specified in one flow process of flow chart or multiple flow process and/or one square frame of block diagram or multiple square frame.
Although preferred embodiments of the present invention have been described, but those skilled in the art are once know basic creative concept, then these embodiments can be made other change and amendment.So, claims are intended to be construed to include preferred embodiment and fall into all changes and the amendment of the scope of the invention.
Obviously, the present invention can be carried out various change and modification without deviating from the spirit and scope of the present invention by those skilled in the art.So, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to include these change and modification.
Claims (10)
1. the driving method of laser instrument in an optical module, it is characterised in that comprise the following steps:
Obtaining constant-current source current voltage, described constant-current source is for adjusting the electric current of flowing through laser；
The relatively magnitude relationship of described constant-current source current voltage and reference voltage, described reference voltage is not less than the minimum running voltage of described constant-current source；
Adjust the output voltage of power supply circuits according to comparative result, described power supply circuits are for powering to described constant-current source and described laser instrument.
2. driving method as claimed in claim 1, it is characterised in that the described output voltage adjusting power supply circuits according to comparative result, specifically includes:
Relatively whether described constant-current source current voltage and the absolute value of the difference of described reference voltage be more than threshold value, if so, then adjusts the output voltage of described power supply circuits according to comparative result.
3. driving method as claimed in claim 1, it is characterised in that the described output voltage adjusting power supply circuits according to comparative result, specifically includes:
If described constant-current source current voltage is more than described reference voltage, then turn down the output voltage of power supply circuits according to comparative result；If described constant-current source current voltage is less than described reference voltage, then heighten the output voltage of power supply circuits according to comparative result.
4. driving method as claimed in claim 1, it is characterised in that the described output voltage adjusting power supply circuits according to comparative result, specifically includes:
If the absolute value of the difference of described constant-current source current voltage and described reference voltage is more than threshold value, then adjust the output voltage of described power supply circuits so that the absolute value of the running voltage of described constant-current source and the difference of reference voltage is not more than threshold value.
5. driving method as claimed in claim 1, it is characterised in that described power supply circuits are high-low voltage power source DC-DC.
6. the drive circuit of laser instrument in an optical module, it is characterised in that including:
Acquiring unit, is used for obtaining constant-current source current voltage, and described constant-current source is for adjusting the electric current of flowing through laser；
Processing unit, for the magnitude relationship of relatively described constant-current source current voltage with reference voltage, described reference voltage is not less than the minimum running voltage of described constant-current source；Adjust the output voltage of power supply circuits according to comparative result, described power supply circuits are for powering to described constant-current source and described laser instrument.
7. drive circuit as claimed in claim 6, it is characterised in that described processing unit, specifically for:
Relatively whether described constant-current source current voltage and the absolute value of the difference of described reference voltage be more than threshold value, if so, then adjusts the output voltage of described power supply circuits according to comparative result.
8. drive circuit as claimed in claim 6, it is characterised in that described processing unit, specifically for:
If described constant-current source current voltage is more than described reference voltage, then turn down the output voltage of power supply circuits according to comparative result；If described constant-current source current voltage is less than described reference voltage, then heighten the output voltage of power supply circuits according to comparative result.
9. drive circuit as claimed in claim 6, it is characterised in that described processing unit, specifically for:
If the absolute value of the difference of described constant-current source current voltage and described reference voltage is more than threshold value, then adjust the output voltage of described power supply circuits so that the absolute value of the running voltage of described constant-current source and the difference of reference voltage is not more than threshold value.
10. drive circuit as claimed in claim 6, it is characterised in that described power supply circuits are high-low voltage power source DC-DC.
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| CN111180999B (en) * | 2020-01-09 | 2021-10-15 | 太原理工大学 | High-precision double-channel adjustable driving system for different semiconductor lasers |
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