CN111048991A - System and method for driving semiconductor laser based on DCDC power module or chip - Google Patents
System and method for driving semiconductor laser based on DCDC power module or chip Download PDFInfo
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- CN111048991A CN111048991A CN201911260760.5A CN201911260760A CN111048991A CN 111048991 A CN111048991 A CN 111048991A CN 201911260760 A CN201911260760 A CN 201911260760A CN 111048991 A CN111048991 A CN 111048991A
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- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
- H01S5/0607—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium by varying physical parameters other than the potential of the electrodes, e.g. by an electric or magnetic field, mechanical deformation, pressure, light, temperature
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Abstract
The invention belongs to the field of optical communication modules, and particularly relates to a system and a method for driving a semiconductor laser based on a DCDC power module or a chip, which solve the problems of high power consumption, difficult external heat dissipation design and the like when the conventional semiconductor laser driving chip drives the laser to emit light. In the system, the DCDC supplies power to the semiconductor laser after reducing the voltage, and then samples the current passing through the laser in real time, and in addition, the MCU control unit is utilized to read the real-time sampling, and the MCU control unit is utilized to set the working current of the semiconductor laser, and finally the sampling and the setting are combined to feed back to the DCDC, so that the dynamic closed-loop constant-power driving of the semiconductor laser is realized. The main power consumption part of the semiconductor laser driving chip is externally arranged and voltage reduction is carried out through DCDC, so that the semiconductor laser driving chip can be used for realizing higher power output and longer-distance transmission under the same power consumption.
Description
Technical Field
The invention relates to a method for driving a semiconductor laser based on a DCDC power module or a chip, belonging to the field of optical communication modules.
Background
In recent years, due to rapid development of services such as high-definition videos, data centers, smart homes, virtual reality technologies and the like, demands on bandwidth, transmission rate, transmission distance and the like of a communication network are higher and higher. As a core device of an optical communication network, a high-speed optical communication transceiver module has been the focus of research. The optical communication transceiver module mainly comprises a semiconductor laser, a detector, a laser driving circuit, a detector amplitude limiting amplifying circuit, an MCU control circuit and the like. The laser driving circuit is generally integrated in a laser driving chip (including signal adjustment, pre-emphasis, equalization, laser driving circuit, DDMI monitoring, etc.), but as the requirement for the output optical power of the optical module is continuously increased, the driving current required by the semiconductor laser is also continuously increased, which brings great difficulty to the design and heat dissipation of the driving chip.
Disclosure of Invention
The purpose of the invention is: the method and the system for driving the semiconductor laser based on the DCDC power module or the chip are provided, and the problems that when the conventional semiconductor laser driving chip drives the laser to emit light, the power consumption is high, the external heat dissipation design is difficult and the like are solved. In the method, a DCDC power supply module or a chip supplies power to a semiconductor laser after reducing the voltage, then samples the current passing through the laser in real time, reads the real-time sample by using an MCU control unit, sets the working current of the semiconductor laser by using the MCU control unit, and finally combines the sampling and the setting to feed back to an FB port of a DCDC power supply, thereby realizing the dynamic closed-loop constant-power driving of the semiconductor laser. The main power consumption part of the semiconductor laser driving chip is externally arranged and voltage reduction is carried out through DCDC, so that the semiconductor laser driving chip can be used for realizing higher power output and longer-distance transmission under the same power consumption. The method for driving the semiconductor laser based on the DCDC constant current has the advantages of low power consumption, good heat dissipation, low cost and the like, and is a very competitive implementation method in the fields of high-power output and long-distance transmission of the semiconductor laser.
The technical scheme of the invention is to provide a semiconductor laser driving system based on a DCDC power module or a chip, which is characterized in that: the device comprises a DCDC power module or chip, two current acquisition circuits, a detector and an MCU control unit;
the DCDC power supply module or the chip is used for converting power supply voltage into actual working voltage of the semiconductor laser in a specified working state and driving the semiconductor laser to emit light; the DCDC power supply module or chip is provided with a feedback input end;
the detector is used for collecting a backlight monitoring value of the semiconductor laser;
the two current acquisition circuits are respectively a driving current acquisition circuit and a backlight current acquisition circuit; the driving current acquisition circuit is used for acquiring the driving current of the semiconductor laser, and converting a driving current signal into a voltage signal as an input signal of the MCU control unit; the backlight current collecting circuit is used for collecting the backlight current of the semiconductor laser; converting the backlight current signal into a voltage signal as an input signal of the MCU control unit;
the MCU control unit is used for monitoring and reporting the driving current or backlight current of the semiconductor laser in real time; and on the other hand, the feedback input end used for outputting a feedback signal to the DCDC power supply module or the chip adjusts the driving current of the semiconductor laser.
Further, the backlight current acquisition circuit is a sampling resistor arranged between the detector and the ground;
the drive current acquisition circuit is high-end sampling or low-end sampling;
when the high-end sampling is performed, the sampling circuit comprises an operational amplifier arranged at the input end of the laser and sampling resistors arranged at the positive input end and the negative input end of the operational amplifier;
when low-side sampling, a sampling resistor is included between the laser output and ground.
The invention also provides another semiconductor laser driving system based on the DCDC power supply module or chip, which is characterized in that: the device comprises a DCDC power module or chip, two current acquisition circuits, a feedback network, a detector and an MCU control unit;
the DCDC power supply module or the chip is used for converting power supply voltage into actual working voltage of the semiconductor laser in a specified working state and driving the semiconductor laser to emit light; the DCDC power supply module or chip is provided with a feedback input end;
the detector is used for collecting a backlight monitoring value of the semiconductor laser;
the two current acquisition circuits respectively drive the current acquisition circuit and the backlight current acquisition circuit, and the drive current acquisition circuit is used for acquiring the drive current of the semiconductor laser and converting a drive current signal into a voltage signal which is used as an input signal of a feedback network and an MCU (micro control unit); the backlight current collecting circuit is used for collecting the backlight current of the semiconductor laser; converting the backlight current signal into a voltage signal as an input signal of the MCU control unit;
the MCU control unit is used for monitoring and reporting the collected semiconductor laser driving current or backlight current in real time; on the other hand, the control device is used for sending a control signal to the feedback network according to a set value;
the feedback network is used for processing the voltage signal output by the current acquisition circuit and the control signal output by the MCU control unit and feeding the processed voltage signal and the control signal back to the feedback input end of the DCDC power supply module or the chip;
the treatment process comprises the following steps: z ═ AX + BY, where A, B is a constant; x is the voltage signal of current acquisition circuit output, and Y is the control signal of MCU control unit output, and Z is the feedback signal of feedback input end to DCDC power module or chip.
Further, the backlight current acquisition circuit is a sampling resistor arranged between the detector and the ground;
the drive current acquisition circuit is high-end sampling or low-end sampling;
when the high-end sampling is performed, the sampling circuit comprises an operational amplifier arranged at the input end of the laser and sampling resistors arranged at the positive input end and the negative input end of the operational amplifier;
when low-side sampling, a sampling resistor is included between the laser output and ground.
Furthermore, the circuit of the feedback network is a non-inverting adder circuit formed by operational amplifiers or a voltage division network formed by resistors.
The invention also provides a method for driving the semiconductor laser based on the system, which comprises the following steps:
step one, a DCDC power supply module or a chip converts module power supply voltage into actual working voltage of a semiconductor laser in a specified working state, and the semiconductor laser is driven to emit light;
secondly, two current collecting circuits respectively collect the driving current of the semiconductor laser and the backlight current of the semiconductor laser, and convert the driving current and the backlight current into corresponding voltage signals;
step three, the MCU control unit carries out real-time monitoring and reporting on the driving current or backlight current of the semiconductor laser; sending a feedback signal to a feedback input end of the DCDC power supply module or the chip according to the following formula;
z ═ AX + BY, where A, B is a constant; x is a voltage signal output by the current acquisition circuit, Y is a control signal of the MCU, and Z is a feedback signal sent to a feedback input end of the DCDC power supply module or the chip;
and step four, the voltage output end of the DCDC power supply module or the chip outputs voltage according to the feedback signal received by the feedback input end.
The invention also provides another method for driving the semiconductor laser based on the system, which comprises the following steps:
step one, a DCDC power supply module or a chip converts module power supply voltage into actual working voltage of a semiconductor laser in a specified working state, and the semiconductor laser is driven to emit light;
secondly, two current collecting circuits respectively collect the driving current of the semiconductor laser and the backlight current of the semiconductor laser, and convert the driving current and the backlight current into corresponding voltage signals;
step three, the MCU control unit carries out real-time monitoring and reporting on the driving current or backlight current of the semiconductor laser; and sending a control signal to a feedback network according to a set value;
the feedback network combines a voltage signal fed back by the current acquisition circuit with a control signal output by the MCU control unit and feeds the voltage signal back to a feedback input end of the DCDC power supply module or the chip;
the combination process is as follows: z ═ AX + BY, where A, B is a constant; x is a voltage signal fed back by the current acquisition circuit, Y is a control signal output by the MCU, and Z is a feedback signal fed back to a feedback input end of the DCDC power supply module or the chip;
and step five, outputting the voltage by the voltage output end of the DCDC power supply module or the chip according to the feedback signal received by the feedback input end.
And further, the third step further comprises that the MCU control unit judges whether the luminous power of the semiconductor laser meets the requirement according to the backlight monitoring feedback value of the semiconductor laser, if not, a control signal is sent to the feedback network, and the driving current of the semiconductor laser is adjusted through the feedback network.
The invention has the beneficial effects that:
1. compared with other methods for driving the semiconductor laser, the method for driving the semiconductor laser based on the DCDC power module or the chip has the advantages that the semiconductor laser constant current driving circuit is independent from the driving chip, heat dispersion is realized, and the difficulty of heat dissipation design of an optical module is reduced.
2. Compared with other methods for driving the semiconductor laser, the method for driving the semiconductor laser based on the DCDC power module or the chip reduces the power supply voltage of the laser during normal work through the DCDC, and achieves the purpose of reducing the overall power consumption of the optical module under the same output power.
3. The method for driving the semiconductor laser based on the DCDC power module or the chip has the advantages of low power consumption, good heat dissipation, low cost and the like, and is a very competitive implementation method in the fields of high-power output and long-distance transmission of the semiconductor laser.
Drawings
Fig. 1 is a block diagram of an implementation of driving a semiconductor laser based on a DCDC power module or a chip according to a first embodiment of the present invention;
fig. 2 is a block diagram of another implementation of driving a semiconductor laser based on a DCDC power module or a chip according to an embodiment of the present invention;
fig. 3 is a block diagram of an implementation of driving a semiconductor laser based on a DCDC power module or a chip according to a second embodiment of the present invention.
Detailed Description
Because the light emitting power of the semiconductor laser is only related to the current passing through the laser, and when the semiconductor laser driving chip provides the bias current of the laser, the prior art adopts a module power supply to directly supply power (namely, the driving chip supplies power), and a built-in MOS transistor control and VI conversion circuit realizes constant current excitation to the semiconductor laser to enable the semiconductor laser to emit light, when the semiconductor laser is required to be applied to a scene of high-power transmission, for example, 32, 64 or more paths of light need to be separated from the OLT in an access network, and the number of the paths depends on the light emitting power of the semiconductor laser, the number of the paths with large power can be more, the number of the required OLTs is small, the overall network distribution power consumption is low, the cost is reduced, otherwise, the number of the paths with small power can be small, the number of the required OLTs can be increased, the network distribution power consumption can be increased, and. In long-distance point-to-point communication, as the transmission link is generally 40km, 80km or even longer, which causes large link loss, the emergent light power of the semiconductor laser needs to be high enough to ensure longer transmission distance and higher receiving sensitivity. High power is accompanied by large current, and the large current means large power consumption, and the large power consumption can increase the difficulty and the cost of design.
In order to solve the problems of high power consumption, large heat productivity and high cost of a semiconductor laser driving chip, the invention provides a system and a method for driving a semiconductor laser based on a DCDC power module or a chip, so that the constant-current driving semiconductor laser with low power consumption, low cost and simple structure can be applied to the field of high-power and long-distance transmission.
The system for driving the semiconductor laser based on the DCDC power module or the chip mainly comprises a semiconductor laser constant current driving part and a real-time current sampling feedback and control part.
The invention is further described with reference to the following figures and specific embodiments.
Example one
The driving part of the embodiment consists of a DCDC power module or a chip, and the sampling feedback and control part consists of a current sampling circuit, a feedback network and an MCU control unit.
The DCDC power module or chip is used as a current driving source of the semiconductor laser to convert the module power supply voltage into the actual working voltage of the laser under the specified working condition, and the voltage will change along with the different requirements of the output optical power instead of being a fixed value.
The current sampling circuit comprises two paths, wherein one path is a driving current acquisition circuit which acquires the driving current of the semiconductor laser and converts the driving current into a voltage signal; and the other path is a backlight current acquisition circuit which acquires the backlight current of the laser component and converts the backlight current into a voltage signal.
The MCU is used as a control unit, on one hand, the acquired semiconductor laser driving current is monitored in real time and reported to the system through the ADC, and on the other hand, a control signal is sent to the feedback network according to a set value. The set value may be determined based on the laser tilt efficiency and the required output optical power.
The feedback network combines a voltage signal fed back by the current sampling circuit with a control signal of the MCU control unit and feeds the voltage signal back to the feedback input end of the DCDC power supply, so that the closed loop of the output and control circuit is realized. Adding according to the proportional relation of AX + BY, determining the coefficient A, B according to specific component parameters, wherein X is a voltage signal fed back BY the current sampling circuit, and Y is a control signal of the MCU control unit.
In addition, the backlight monitoring value of the semiconductor laser is fed back to the MCU control unit, and then a control instruction is issued to the closed-loop circuit through the MCU control unit to form a large closed loop of the whole circuit, so that the semiconductor laser can output stable and unchangeable light power under different environments (for example, when the ambient temperature changes, the oblique efficiency of the semiconductor laser changes, and the light emitting power of the semiconductor laser rises or decreases).
A DCDC-based constant current driving semiconductor laser system implemented according to the present invention is shown in fig. 1. The device mainly comprises a DCDC power module or chip, a current acquisition circuit, a feedback network, an MCU control unit and a detector.
The DCDC power supply module comprises a VOUT pin and a FB pin;
the current acquisition circuit adopts, for example, integrated operational amplifier high-end sampling or sampling resistor low-end sampling, as long as the acquisition of the driving current value of the semiconductor laser can be realized. The high-end sampling is shown in fig. 1 and comprises an operational amplifier and a resistor R connected between a positive input end and a negative input end of the operational amplifier; low-side sampling is shown in fig. 2 and includes a sampling resistor R connected between the laser and ground.
The feedback network is actually formed by resistors or operational amplifiers, and functions to adjust the negative feedback strength of each feedback signal, for example, OUT ═ a × IN1+ B × IN 2. Wherein IN1 is the voltage value fed back by the driving current sampling circuit, and IN2 is the control signal output by the MCU control unit.
The MCU control unit comprises a DAC pin, an ADC1 pin and an ADC2 pin;
a VOUT pin of a DCDC power supply module or a chip is connected with the anode of a laser LD, a driving current sampling circuit can be inserted into any point of a current path, an OUT1 pin of the driving current sampling circuit is connected with an IN1 pin of a feedback network, and an OUT2 pin of the driving current sampling circuit is connected with an ADC2 pin of an MCU control unit; and the OUT pin of the backlight current acquisition circuit is connected with the ADC1 pin of the MCU control unit. In fig. 2, a pin OUT2 of the driving current acquisition circuit is connected with a pin ADC1 of the MCU control unit; and the OUT pin of the backlight current acquisition circuit is connected with the ADC2 pin of the MCU control unit.
The DCDC power module or the chip converts the working voltage of the optical module into the working voltage of the semiconductor laser, provides constant current for driving the semiconductor laser and outputs the constant current from a VOUT pin, and the constant current drives the semiconductor laser to emit light through the current acquisition circuit.
The drive current acquisition circuit acquires the drive current and then feeds the acquired drive current back to the feedback network and the MCU control unit through OUT1 and OUT2 pins respectively, wherein the OUT2 pin directly feeds a feedback value of the drive current back to the MCU control unit to serve as a real-time monitoring quantity of the optical module end and report the real-time monitoring quantity to the system board card, and the OUT1 pin feeds the feedback value of the drive current back to the feedback network and feeds the feedback value back to the DCDC power supply module from the FB pin after the set value of the semiconductor laser is converted and operated by combining the MCU control unit so as to control the output of the OUT pin.
The operation process can be an AX + BY process, X is a voltage signal fed back BY the current acquisition circuit, Y is a control signal output BY the MCU control unit, A, B is a constant, and the operation process is determined according to specific component test.
In addition, the detector in fig. 1 is used for monitoring the backlight of the semiconductor laser, and can feed back the light emitted by the semiconductor laser to the MCU control unit in real time through the ADC2 pin according to a certain ratio, and determine whether the light emitting power of the semiconductor laser meets the requirement according to the feedback value, if so, the light emitting power is not changed, and if not, the light emitting power is sent to the auxiliary circuit through the DAC pin to be adjusted until the light emitted by the light emitting power of the semiconductor laser meets the predetermined requirement.
The method for driving the semiconductor laser by using the DCDC constant current effectively solves the problems of high power consumption, large heat productivity, high cost and the like of a driving chip of the semiconductor laser, has the advantages of low power consumption, simple manufacture, low cost and the like, and can be widely applied to an access network OLT end, a long-distance point-to-point end and other various transmission systems requiring high-power transmission.
Example two
The driving part of the embodiment consists of a DCDC power module or a chip, and the sampling feedback and control part consists of a current sampling circuit and an MCU control unit.
The DCDC power module or chip is used as a current driving source of the semiconductor laser to convert the module power supply voltage into the actual working voltage of the laser under the specified working condition, and the voltage will change along with the different requirements of the output optical power instead of being a fixed value.
The current sampling circuit comprises two paths, wherein one path is a driving current acquisition circuit, acquires the driving current of the semiconductor laser and converts the driving current into a voltage signal; and the other path is a backlight current acquisition circuit which acquires the backlight current of the laser component and converts the backlight current into a voltage signal.
The MCU is used as a control feedback unit, on one hand, the acquired semiconductor laser driving current is monitored and reported to the system in real time through the ADC, and on the other hand, a feedback signal is sent to a feedback end of the DCDC power module or the chip.
In addition, the backlight monitoring value of the semiconductor laser is fed back to the MCU control unit, and then a control instruction is issued to the closed-loop circuit through the MCU control unit to form a large closed loop of the whole circuit, so that the semiconductor laser can output stable and unchangeable light power under different environments (for example, when the ambient temperature changes, the oblique efficiency of the semiconductor laser changes, and the light emitting power of the semiconductor laser rises or decreases).
Another DCDC-based constant current driving semiconductor laser system implemented according to the present invention is shown in fig. 3. The device mainly comprises a DCDC power module or chip, a current acquisition circuit, an MCU control unit and a detector.
The DCDC power supply module comprises a VOUT pin and a FB pin;
the current acquisition circuit adopts, for example, integrated operational amplifier high-end sampling or sampling resistor low-end sampling, as long as the acquisition of the driving current value of the semiconductor laser can be realized. The high-end sampling is shown in fig. 1 and comprises an operational amplifier and a resistor R connected between a positive input end and a negative input end of the operational amplifier; low-side sampling is shown in fig. 2 and includes a sampling resistor R connected between the laser and ground.
The MCU control unit comprises a DAC pin, an ADC1 pin and an ADC2 pin;
a VOUT pin of a DCDC power supply module or a chip is connected with the anode of a laser LD, a driving current sampling circuit can be inserted into any point of a current path, and an OUT pin of the driving current sampling circuit is connected with an ADC1 pin of an MCU control unit; and the OUT pin of the backlight current acquisition circuit is connected with the ADC2 pin of the MCU control unit.
The DCDC power module or the chip converts the working voltage of the optical module into the working voltage of the semiconductor laser, provides constant current for driving the semiconductor laser and outputs the constant current from a VOUT pin, and the constant current drives the semiconductor laser to emit light through the current acquisition circuit.
The drive current acquisition circuit acquires the drive current and feeds the acquired drive current back to the MCU through an OUT pin, and the drive current is used as the real-time monitoring quantity of the optical module end and reported to the system board card; and meanwhile, a feedback signal can be output to a feedback input end of the DCDC power supply module or the chip, the feedback signal can form an inverse proportion negative feedback relation BY the working current of the laser, for example, the negative feedback relation is determined BY AX + BY, X is a voltage signal fed back BY the current acquisition circuit, Y is a control signal of the MCU, A, B is a constant, and the feedback signal is determined according to specific component test. Or, independently thereof, the output control signal may directly influence the output voltage of the DCDC.
In addition, the detector in fig. 1 is used for monitoring the backlight of the semiconductor laser, and can feed back the light emitted by the semiconductor laser to the MCU control unit in real time through the ADC2 pin according to a certain ratio, and determine whether the light emitting power of the semiconductor laser meets the requirement according to the feedback value, if so, the light emitting power is not changed, and if not, the light emitting power is sent to the auxiliary circuit through the DAC pin to be adjusted until the light emitted by the light emitting power of the semiconductor laser meets the predetermined requirement.
The method for driving the semiconductor laser by using the DCDC constant current effectively solves the problems of high power consumption, large heat productivity, high cost and the like of a driving chip of the semiconductor laser, has the advantages of low power consumption, simple manufacture, low cost and the like, and can be widely applied to an access network OLT end, a long-distance point-to-point end and other various transmission systems requiring high-power transmission.
While the above-described embodiments have been described in detail with reference to specific embodiments thereof, it will be understood that the present invention is not limited to the details of the embodiments, but is intended to cover various modifications, equivalents, and improvements included within the spirit and scope of the invention.
Claims (8)
1. A system based on DCDC power module or chip drive semiconductor laser, its characterized in that: the device comprises a DCDC power module or chip, two current acquisition circuits, a detector and an MCU control unit;
the DCDC power supply module or the chip is used for converting power supply voltage into actual working voltage of the semiconductor laser in a specified working state and driving the semiconductor laser to emit light; the DCDC power supply module or chip is provided with a feedback input end;
the detector is used for collecting a backlight monitoring value of the semiconductor laser;
the two current acquisition circuits are respectively a driving current acquisition circuit and a backlight current acquisition circuit; the driving current acquisition circuit is used for acquiring the driving current of the semiconductor laser, and converting a driving current signal into a voltage signal as an input signal of the MCU control unit; the backlight current collecting circuit is used for collecting the backlight current of the semiconductor laser; converting the backlight current signal into a voltage signal as an input signal of the MCU control unit;
the MCU control unit is used for monitoring and reporting the driving current or backlight current of the semiconductor laser in real time; and on the other hand, the feedback input end used for outputting a feedback signal to the DCDC power supply module or the chip adjusts the driving current of the semiconductor laser.
2. The DCDC-based power module or chip-driven semiconductor laser system of claim 1, wherein: the backlight current acquisition circuit is a sampling resistor arranged between the detector and the ground;
the drive current acquisition circuit is high-end sampling or low-end sampling;
when the high-end sampling is performed, the sampling circuit comprises an operational amplifier arranged at the input end of the laser and sampling resistors arranged at the positive input end and the negative input end of the operational amplifier;
when low-side sampling, a sampling resistor is included between the laser output and ground.
3. A system based on DCDC power module or chip drive semiconductor laser, its characterized in that: the device comprises a DCDC power module or chip, two current acquisition circuits, a feedback network, a detector and an MCU control unit;
the DCDC power supply module or the chip is used for converting power supply voltage into actual working voltage of the semiconductor laser in a specified working state and driving the semiconductor laser to emit light; the DCDC power supply module or chip is provided with a feedback input end;
the detector is used for collecting a backlight monitoring value of the semiconductor laser;
the two current acquisition circuits respectively drive the current acquisition circuit and the backlight current acquisition circuit, and the drive current acquisition circuit is used for acquiring the drive current of the semiconductor laser and converting a drive current signal into a voltage signal which is used as an input signal of a feedback network and an MCU (micro control unit); the backlight current collecting circuit is used for collecting the backlight current of the semiconductor laser; converting the backlight current signal into a voltage signal as an input signal of the MCU control unit;
the MCU control unit is used for monitoring and reporting the collected semiconductor laser driving current or backlight current in real time; on the other hand, the control device is used for sending a control signal to the feedback network according to a set value;
the feedback network is used for processing the voltage signal output by the current acquisition circuit and the control signal output by the MCU control unit and feeding the processed voltage signal and the control signal back to the feedback input end of the DCDC power supply module or the chip;
the treatment process comprises the following steps: z ═ AX + BY, where A, B is a constant; x is the voltage signal of current acquisition circuit output, and Y is the control signal of MCU control unit output, and Z is the feedback signal of feedback input end to DCDC power module or chip.
4. The DCDC-based power module or chip-driven semiconductor laser system of claim 3, wherein: the backlight current acquisition circuit is a sampling resistor arranged between the detector and the ground;
the drive current acquisition circuit is high-end sampling or low-end sampling;
when the high-end sampling is performed, the sampling circuit comprises an operational amplifier arranged at the input end of the laser and sampling resistors arranged at the positive input end and the negative input end of the operational amplifier;
when low-side sampling, a sampling resistor is included between the laser output and ground.
5. The DCDC-based power module or chip-driven semiconductor laser system of claim 4, wherein:
the circuit of the feedback network is a same-phase adder circuit formed by operational amplifiers or a voltage division network formed by resistors.
6. A method of driving a semiconductor laser based on the system of claim 1, comprising the steps of:
step one, a DCDC power supply module or a chip converts module power supply voltage into actual working voltage of a semiconductor laser in a specified working state, and the semiconductor laser is driven to emit light;
secondly, two current collecting circuits respectively collect the driving current of the semiconductor laser and the backlight current of the semiconductor laser, and convert the driving current and the backlight current into corresponding voltage signals;
step three, the MCU control unit carries out real-time monitoring and reporting on the driving current or backlight current of the semiconductor laser; sending a feedback signal to a feedback input end of the DCDC power supply module or the chip according to the following formula;
z ═ AX + BY, where A, B is a constant; x is a voltage signal output by the current acquisition circuit, Y is a control signal of the MCU, and Z is a feedback signal sent to a feedback input end of the DCDC power supply module or the chip;
and step four, the voltage output end of the DCDC power supply module or the chip outputs voltage according to the feedback signal received by the feedback input end.
7. A method of driving a semiconductor laser based on the system of claim 3, comprising the steps of:
step one, a DCDC power supply module or a chip converts module power supply voltage into actual working voltage of a semiconductor laser in a specified working state, and the semiconductor laser is driven to emit light;
secondly, two current collecting circuits respectively collect the driving current of the semiconductor laser and the backlight current of the semiconductor laser, and convert the driving current and the backlight current into corresponding voltage signals;
step three, the MCU control unit carries out real-time monitoring and reporting on the driving current or backlight current of the semiconductor laser; and sending a control signal to a feedback network according to a set value;
the feedback network combines a voltage signal fed back by the current acquisition circuit with a control signal output by the MCU control unit and feeds the voltage signal back to a feedback input end of the DCDC power supply module or the chip;
the combination process is as follows: z ═ AX + BY, where A, B is a constant; x is a voltage signal fed back by the current acquisition circuit, Y is a control signal output by the MCU, and Z is a feedback signal fed back to a feedback input end of the DCDC power supply module or the chip;
and step five, outputting the voltage by the voltage output end of the DCDC power supply module or the chip according to the feedback signal received by the feedback input end.
8. The method of driving a semiconductor laser based on a DCDC power module or chip of claim 7, wherein:
the third step also comprises that the MCU control unit judges whether the luminous power of the semiconductor laser meets the requirement or not according to the backlight monitoring feedback value of the semiconductor laser, if not, a control signal is sent to the feedback network, and the driving current of the semiconductor laser is adjusted through the feedback network.
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| CN201911260760.5A CN111048991A (en) | 2019-12-10 | 2019-12-10 | System and method for driving semiconductor laser based on DCDC power module or chip |
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| CN111416275A (en) * | 2020-04-09 | 2020-07-14 | 光梓信息科技（上海）有限公司 | Laser monitoring circuit, laser calibration system and method |
| CN111600197A (en) * | 2020-05-22 | 2020-08-28 | 索尔思光电（成都）有限公司 | Light-emitting power monitoring and APC control circuit and method based on EA photocurrent |
| CN113922870A (en) * | 2021-09-30 | 2022-01-11 | 青岛海信宽带多媒体技术有限公司 | Optical module |
| WO2022127077A1 (en) * | 2020-12-16 | 2022-06-23 | 上海禾赛科技有限公司 | Transmitter circuit for laser radar and method for detecting driving current of transmitter circuit |
| WO2022258029A1 (en) * | 2021-06-11 | 2022-12-15 | 华为技术有限公司 | Photoelectric assembly, light source pool, photoelectric switching device, and control method for photoelectric assembly |
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Application publication date: 20200421 |