CN114300935B - Laser driving system, laser device, and laser driving method - Google Patents
Laser driving system, laser device, and laser driving method Download PDFInfo
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Abstract
The invention discloses a driving system, a laser device and a driving method of a laser, wherein the driving system comprises: the device comprises a controller, an adjustable voltage source and at least two constant current driving circuits, wherein the adjustable voltage source is connected with the constant current driving circuits, the adjustable voltage source and the constant current driving circuits are both connected with the controller, and each constant current driving circuit is used for driving a laser; the controller is configured to output a current control signal to the constant current driving circuit so that the constant current driving circuit outputs a constant driving current to the laser; the controller is configured to output a voltage control signal to the adjustable voltage source so that the adjustable voltage source outputs a minimum output voltage to the constant current driving circuit, wherein the minimum output voltage is a minimum voltage allowed for ensuring normal operation of the constant current driving circuit under the current driving current condition. By implementing the invention, the power consumption and the heat of the whole system can be reduced.
Description
Technical Field
The present invention relates to the field of laser technologies, and in particular, to a driving system, a laser device, and a driving method for a laser.
Background
With the development of the optical communication industry, the size of the laser becomes smaller and smaller, multiple lasers are often packaged in one shell, and in order to save space, unified electrodes of the multiple lasers are connected together, and only one pin is led out, so that many lasers with common cathodes and common anodes appear.
In order to save space, the conventional common cathode driving circuit is usually implemented by using integrated IDAC. Its advantages are small space and high integration level. But has the disadvantages of high cost and limited driving capability.
The development of the optical communication industry, in which lasers are used as core devices, is also under continuous development, and requires constant power or greater power, but the volume is smaller, and the requirements for driving are higher. IDAC integrated chip-controlled lasers have limited driving capabilities, requiring the use of multiple parallel-connected chips to increase driving capabilities if higher power laser drives are to be met, thus increasing volume and cost. And the traditional MOS constant current driving circuit is directly used, so that a lot of heat can be generated under high power, and the low-volume module is also a great challenge.
Disclosure of Invention
The invention provides a driving system, a laser device and a driving method of a laser, and aims to solve the problem that the existing driving system of the laser can generate a lot of heat under high power.
In a first aspect, the present invention provides a driving system for a laser, comprising: the device comprises a controller, an adjustable voltage source and at least two constant current driving circuits, wherein the adjustable voltage source is connected with the constant current driving circuits, the adjustable voltage source and the constant current driving circuits are both connected with the controller, and each constant current driving circuit is used for driving a laser; the controller is configured to output a current control signal to the constant current driving circuit so that the constant current driving circuit outputs a constant driving current to the laser; the controller is configured to output a voltage control signal to the adjustable voltage source so that the adjustable voltage source outputs a minimum output voltage to the constant current driving circuit, wherein the minimum output voltage is a minimum voltage allowed for ensuring normal operation of the constant current driving circuit under the current driving current condition.
Further, the constant current driving circuit comprises an operational amplifier and a P-type switching tube, wherein the forward input end of the operational amplifier is connected with the controller, the output end of the operational amplifier is connected with the control end of the P-type switching tube, the input end of the P-type switching tube is connected with the adjustable voltage source, and the output end of the P-type switching tube is used for being connected with the laser.
Further, the constant current driving circuit further comprises a feedback unit, one end of the feedback unit is connected between the adjustable voltage source and the input end of the P-type switching tube, the other end of the feedback unit is connected with the reverse input end of the operational amplifier, and the feedback unit forms a negative feedback control loop for the operational amplifier.
Further, the feedback unit includes: the sampling unit is connected in series between the adjustable voltage source and the input end of the P-type switching tube, and is used for feeding back an acquisition feedback signal to the operational amplifier; and one end of the proportion adjusting unit is connected between the sampling unit and the input end of the P-type switching tube, the other end of the proportion adjusting unit is connected with the reverse input end of the operational amplifier, and the proportion adjusting unit is used for adjusting the proportion of the feedback signal.
Further, the sampling unit comprises a sampling resistor which is connected in series between the adjustable voltage source and the input end of the P-type switching tube.
Further, the proportion adjusting unit comprises a first voltage dividing resistor and a second voltage dividing resistor, the first voltage dividing resistor and the second voltage dividing resistor are connected in series and then grounded, the first voltage dividing resistor is connected with the sampling resistor, and the first voltage dividing resistor and the second voltage dividing resistor are connected with the reverse input end of the operational amplifier.
Further, the minimum output voltage is:
Vmin＝V Excitation device +V Collecting +VP Pipe min
Wherein V min is the minimum output voltage, V Excitation device is the voltage of the laser, V Collecting is the voltage of the sampling resistor, and V P Pipe min is the voltage of the P-type switching tube, where V P Pipe min and V min are positively correlated under the current driving current condition.
Further, the driving circuit is provided with an adjustable voltage source, and all the constant current driving circuits are connected with the adjustable voltage source; or the driving circuit is provided with at least two adjustable voltage sources, and each adjustable voltage source is independently connected with one constant current driving circuit.
In a second aspect, the present invention further provides a laser device, including a laser with a common cathode and a driving system of the laser, where the driving system is the driving system described in the first aspect, and each constant current driving circuit is used for driving the laser with the common cathode.
In a third aspect, the present invention also provides a driving method applied to the laser device of the second aspect, the driving method including: the controller outputs a current control signal to the constant current driving circuit to control the constant current driving circuit to output a constant driving current to the laser; the output voltage of the adjustable voltage source is regulated under the current driving current condition, so that the constant current driving circuit works in the minimum power consumption state; when the constant current driving circuit works in a minimum power consumption state, the controller acquires the output voltage of the adjustable voltage source as the minimum output voltage of the adjustable voltage source; the controller outputs a voltage control signal to the adjustable voltage source to cause the adjustable voltage source to maintain outputting the minimum output voltage.
Compared with the prior art, the invention has the beneficial effects that: the power supply voltage is provided for the constant current driving circuits by using the adjustable voltage sources, each constant current driving circuit is used for driving a laser, a current control signal is output to the constant current driving circuit through the controller, the constant current driving circuit is controlled to output constant driving current to drive the laser, meanwhile, the voltage control signal is output to the adjustable voltage sources by the controller, the minimum output voltage is output to the adjustable voltage sources, and the adjustable voltage sources are controlled to be provided for the constant current driving circuit.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 shows a schematic diagram of a drive system for a laser according to an embodiment of the present invention;
FIG. 2 shows a schematic diagram of a drive system for a laser according to another embodiment of the present invention;
FIG. 3 shows a plot of the volt-ampere characteristics of a laser according to an embodiment of the present invention;
FIG. 4 shows a schematic diagram of a constant current drive circuit of a drive system of a laser according to an embodiment of the present invention;
FIG. 5 shows a schematic diagram of a constant current drive circuit of a drive system of a laser according to another embodiment of the present invention;
fig. 6 shows a circuit diagram of a constant current drive circuit of a drive system of a laser according to an embodiment of the present invention;
fig. 7 shows a circuit diagram of a constant current drive circuit of a drive system of a laser according to another embodiment of the present invention;
FIG. 8 is a flow chart showing the steps of a driving method according to an embodiment of the present invention;
10. A controller; 20. an adjustable voltage source; 30. a constant current driving circuit; 31. a P-type switching tube; 32. a feedback unit; 321. a sampling unit; 322. a proportion adjusting unit; 40. a laser.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be understood that the terms "comprises" and "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It is also to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be further understood that the term "and/or" as used in the present specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.
Referring to fig. 1, an embodiment of the present invention provides a driving system of a laser, including: the laser comprises a controller 10, an adjustable voltage source 20 and at least two constant current driving circuits 30, wherein the adjustable voltage source 20 is connected with the constant current driving circuits 30, the adjustable voltage source 20 and the constant current driving circuits 30 are connected with the controller 10, and each constant current driving circuit 30 is used for driving a laser 40; the controller 10 is configured to output a current control signal to the constant current driving circuit 30 so that the constant current driving circuit 30 outputs a constant driving current to the laser 40; the controller 10 is configured to output a voltage control signal to the adjustable voltage source 20 to enable the adjustable voltage source 20 to output a minimum output voltage to the constant current driving circuit 30, where the minimum output voltage is a minimum voltage allowed to ensure that the constant current driving circuit 30 works normally under the current driving current condition.
Specifically, the present embodiment uses a controller 10 to control the system, controls the input of the laser control amount using the current control signal, and adjusts the supply voltage of the adjustable voltage power supply using the voltage control signal. The constant voltage driving circuit outputs a constant driving current, which may be set in advance. The cathodes of the lasers are directly connected to Ground (GND), i.e. the common cathode, and each anode is connected to one constant current drive circuit 30, with a plurality of such constant current drive circuits 30 the lasers of the common cathode can be driven. In short, an adjustable voltage source 20, a constant current driving circuit 30 and a laser form a group of driving, each group of driving is controlled by a current control signal and a voltage control signal output by the same controller 10, the circuit structure is simple, and the control is more flexible.
By implementing the embodiment, the adjustable voltage source 20 is utilized to provide a power supply voltage for the constant current driving circuits 30, each constant current driving circuit 30 is used for driving a laser 40, a current control signal is output to the constant current driving circuit 30 through the controller 10, the constant current driving circuit 30 is controlled to output a constant driving current to drive the laser 40, meanwhile, the controller 10 outputs a voltage control signal to the adjustable voltage source 20, the adjustable voltage source 20 is controlled to output a minimum output voltage to be provided for the constant current driving circuit 30, therefore, each laser 40 is configured with one constant current driving circuit 30 to drive, under the condition that the driving capability meets the requirement, the power supply voltage of the adjustable voltage source 20 is adjusted, the adjustable voltage source 20 outputs the minimum output voltage to enable the constant current driving circuit 30 to work in a minimum power consumption state, the system always works in an optimal power consumption state, and the power consumption and the heat of the whole system are reduced.
In addition, the embodiment can also play a role in limiting current, specifically, after the power supply voltage output by the adjustable voltage source 20 is fixed to the minimum output voltage, the maximum voltage value allowed by the two ends of the laser 40 is also a fixed voltage value; according to the volt-ampere characteristic of the laser 40, each voltage corresponds to a current value, the laser 40 needs to reach higher current, and the voltage maximum is limited at the time when the voltage is required to reach higher current, so that the limited maximum current allowed to pass by the laser 40 is limited, and the protection function of limiting the current is achieved. Illustratively, as shown in FIG. 3, when the voltage across the laser 40 is limited to V1, the maximum current that can be passed through the laser 40 can only reach I1, thereby achieving a current limiting effect.
In one embodiment, referring to fig. 1, the driving system is provided with at least two adjustable voltage sources 20, and each adjustable voltage source 20 is separately connected to one constant current driving circuit 30. Specifically, the number of the adjustable voltage sources 20 corresponds to the number of the constant current driving circuits 30, and each adjustable voltage source 20 is correspondingly connected with one constant current driving circuit 30, that is, one adjustable voltage source 20 is used for adjusting one constant current driving circuit 30, so that the control is flexible.
In another embodiment, referring to fig. 2, the driving system is provided with one adjustable voltage source 20, and all the constant current driving circuits 30 are connected to the adjustable voltage source 20. In this embodiment, only one adjustable voltage source 20 is provided, which is equivalent to combining all the adjustable voltage sources 20 of the previous embodiment into one adjustable voltage source 20, so that a large space can be saved, and the device is suitable for all the devices which need to be miniaturized.
In an embodiment, referring to fig. 4, the constant current driving circuit 30 includes an operational amplifier and a P-type switching tube 31, wherein a forward input end of the operational amplifier is connected to the controller 10, an output end of the operational amplifier is connected to a control end of the P-type switching tube 31, an input end of the P-type switching tube 31 is connected to the adjustable voltage source 20, and an output end of the P-type switching tube 31 is used for connecting the laser. The constant current driving circuit 30 is formed by the operational amplifier and the P-type switching tube 31, and the driving circuit combining the P-type switching tube 31 and the operational amplifier is simple in principle and easy to realize; the operational amplifier with smaller volume and the P-type switching tube 31 can be selected to realize the design with small volume; the P-type switching tube 31 can be driven by a large current with a small volume, and a larger current can be driven.
In a specific embodiment, referring to fig. 4, the constant current driving circuit 30 further includes a feedback unit 32, one end of the feedback unit 32 is connected between the adjustable voltage source 20 and the input end of the P-type switching tube 31, the other end of the feedback unit 32 is connected to the inverting input end of the operational amplifier, and the feedback unit 32 forms a negative feedback control loop for the operational amplifier. Specifically, in this embodiment, a feedback unit 32 is added between the output end and the inverting input end of the operational amplifier, and a negative feedback control loop is formed by using the feedback unit 32, so as to maintain the stability of the system control.
In one embodiment, referring to fig. 5, the feedback unit 32 includes: the sampling unit 321 and the proportion adjusting unit 322 are used for sampling the sampling unit 321, the sampling unit 321 is connected in series between the adjustable voltage source 20 and the input end of the P-type switching tube 31, and the sampling unit 321 is used for feeding back an acquisition feedback signal to the operational amplifier; and one end of the proportion adjusting unit 322 is connected between the sampling unit 321 and the input end of the P-type switching tube 31, the other end of the proportion adjusting unit 322 is connected with the inverting input end of the operational amplifier, and the proportion adjusting unit 322 is used for adjusting the proportion of the feedback signal. Specifically, the feedback signal in this embodiment is a voltage signal, and the sampling unit 321 transmits the collected feedback signal to the inverting input end of the operational amplifier, so as to form negative feedback control, and ensure the stability of the output of the operational amplifier. And the sampling unit 321 is connected to the inverting input terminal of the operational amplifier via the proportional adjusting unit 322, and the proportional adjusting unit 322 is used for adjusting the magnitude of the feedback signal, that is, adjusting the magnitude of the voltage signal fed back, so that the operational amplifier can control the magnitude of the output signal according to the magnitude of the feedback signal.
In a specific embodiment, referring to fig. 6, the sampling unit 321 includes a sampling resistor R1, where the sampling resistor R1 is connected in series between the adjustable voltage source 20 and the input terminal of the P-type switching tube 31. In this embodiment, the sampling resistor R1 is used as the sampling unit 321, and since the resistor is connected in series between the adjustable voltage source 20 and the P-type switching tube 31, the adjustable voltage source 20, the P-type switching tube 31 and the laser are connected in series, the sampling resistor R1 can feed back the current conversion voltage signal flowing through the P-type switching tube 31 and the laser to the operational amplifier to form negative feedback, so as to maintain the stability of the system control. It will of course be appreciated that in other embodiments, the sampling unit 321 may also be other forms of components, such as an ADC.
In a specific embodiment, referring to fig. 6, the proportion adjusting unit 322 includes a first voltage dividing resistor R2 and a second voltage dividing resistor R3, where the first voltage dividing resistor R2 and the second voltage dividing resistor R3 are connected in series and then grounded, the first voltage dividing resistor R2 is connected to the sampling resistor, and an inverting input end of the operational amplifier is connected between the first voltage dividing resistor R2 and the second voltage dividing resistor R3. Specifically, the present embodiment adopts two voltage dividing resistors to form the proportion adjusting unit 322, and the proportion of the feedback signal can be adjusted by using the voltage dividing characteristic of the voltage dividing resistors, specifically, the proportion of the feedback signal is adjusted by increasing or decreasing the resistance value of the voltage dividing resistors, so that the proportion of the current control signal and the actual driving current is adjusted, and the control is more flexible.
In an embodiment, referring to fig. 6, the P-type switching tube 31 is a PMOS tube Q1, a gate of the PMOS tube Q1 is connected to an output end of the operational amplifier, a source of the PMOS tube Q1 is connected to the sampling resistor, and a drain of the PMOS tube Q1 is connected to an anode of the laser. The operational amplifier controls the on/off of the PMOS tube Q1 through the grid electrode of the PMOS tube Q1. The PMOS tube Q1 has small volume, the design of small volume is easy to realize, and the small volume of the PMOS tube Q1 can drive larger current through large current. Specifically, Q1 is a P-type field effect transistor PMOS, A1 is an operational amplifier, R1 is a current sampling resistor, R2 and R3 are voltage dividing resistors in the feedback unit 32, and D1 is one of the lasers in the common cathode laser. The controller 10 outputs a current control signal, and inputs the current control signal to the "+" pole input end of the operational amplifier A1, the output of the operational amplifier changes, and the PMOS tube Q1 is controlled in such a way that the voltage difference between the G pole and the S pole of the MOS tube is regulated to regulate the current passing through the PMOS tube Q1. R1 is a current sampling resistor, and converts the current on the path of the laser D1 and the PMOS tube Q1 into voltage and feeds the voltage back to the input end of the 'electrode' of the operational amplifier A1, so as to form a negative feedback control loop, and maintain the stability of system control. The proportion of the feedback signal can be adjusted by the resistor R2 and the resistor R3, so that the proportion of the current control signal and the actual driving current is adjusted, and the control is more flexible.
In another embodiment, referring to fig. 7, the P-type switching tube 31 is a PNP tube Q2, a base electrode of the PNP tube Q2 is connected to an output end of the operational amplifier, a collector electrode of the PNP tube Q2 is connected to the sampling resistor, and an emitter electrode of the PNP tube Q2 is connected to an anode of the laser. The operation amplifier controls the on or off of the PNP tube Q2 through the base electrode of the PNP tube Q2.
In one embodiment, the minimum output voltage is:
Vmin＝V Excitation device +V Collecting +VP Pipe min
Wherein V min is the minimum output voltage, V Excitation device is the voltage of the laser, V Collecting is the voltage of the sampling resistor, and V P Pipe min is the voltage of the P-type switching tube 31, where V P Pipe min and V min are positively correlated under the current driving current condition.
Specifically, the controller 10 outputs a current control signal to drive the constant current drive circuit 30 to output a drive current, and also outputs a voltage control signal to output a power supply voltage to the constant current drive circuit 30. The sampling resistor, the two ends of the DS of the PMOS tube and the lasers are connected in series, the constant current driving circuit 30 outputs constant driving current to the serial circuit, the current on the serial circuit is the driving current, then the voltage of the lasers corresponding to the current driving current is calculated according to the volt-ampere characteristic relation of the lasers, and then the voltage on the PMOS and the sampling resistor is added, so that the minimum output voltage of the adjustable voltage source 20 can be calculated. The voltage drop across the DS of the PMOS in the constant current drive circuit 30 is limited to the lowest level, and the power consumption of the PMOS is the product of the current that the DS passes and the voltage difference across the DS, thereby limiting the power consumption of the constant current drive circuit 30 to the minimum.
The voltage drop at two ends of the DS of the PMOS is achieved by adjusting the adjustable voltage source 20, specifically, after the constant current driving circuit 30 outputs the driving current, the power consumption of the laser and the sampling resistor is fixed, the power consumption on the MOS transistor is related to the output voltage of the adjustable voltage source 20, the higher the voltage of the adjustable voltage source 20 is, the higher the power consumption on the MOS transistor is, the lower the voltage of the adjustable voltage source 20 is, the lower the power consumption of the MOS transistor is, that is, the positive correlation between V P Pipe min and V min is achieved. The voltage of the MOS transistor is regulated to an allowable minimum value, and the power consumption of the constant current driving circuit 30 is minimized.
That is, the output voltage of the adjustable voltage source 20 can be adjusted under the condition that the laser is driven by the driving current to work normally, so that the voltage on the MOS transistor is the minimum, that is, the minimum output voltage of the adjustable voltage source 20 adjustable at this time, and the power consumption of the constant current driving circuit 30=the current (three devices are connected in series, the current is the same value) flowing through the laser, the PMOS and the sampling resistor.
The embodiment of the invention also provides a laser device, which comprises a laser with a common cathode and a driving system of the laser, wherein the driving system is the driving system in the embodiment, and each constant current driving circuit 30 is used for driving the laser with the common cathode.
Specifically, the constant current driving circuit 30 is configured to convert a current control signal output from the controller 10 into a constant circuit signal to drive the laser, and keep the current in the line constant during operation. The input voltage control signal of the adjustable voltage source 20 controls the output of the adjustable voltage source 20. Common cathode lasers, multiple lasers with their cathodes connected together and anodes separated. The controller 10 outputs a voltage control signal and a current control signal to control the adjustable voltage source 20 and the constant current drive circuit 30. The current control signal, which is a voltage signal output from the controller 10, is input to the constant current drive circuit 30. The voltage control signal, which is the output of the controller 10, is a voltage signal that is input to the adjustable voltage source 20. If the corresponding laser needs to be driven to a corresponding current, the controller 10 needs to output a corresponding current control signal, the current control signal is input into the corresponding constant current driving circuit 30, and the constant current driving circuit 30 controls the current flowing into the corresponding laser to reach the driving current. The controller 10 outputs a current control signal and also outputs a corresponding voltage control signal, and the voltage of the laser under the driving current condition is added with the minimum output voltage of the constant current driving circuit 30 to obtain the output value of the voltage control signal, and the output value is input to the adjustable voltage source 20, and the adjustable voltage source 20 adjusts the voltage input to the constant current driving circuit 30.
With this system, the voltage on the constant current drive circuit 30 can be controlled to be the minimum voltage under the present current condition, and the power consumption of the circuit is the current multiplied by the voltage, and the power consumption at this time will reach the minimum power consumption of the circuit. The output voltage of the adjustable voltage source 20 also limits the maximum current of the constant current drive circuit 30, and the output voltage can be adjusted to adjust the maximum current which can be output, so that the circuit current limiting protection is realized.
Referring to fig. 8, an embodiment of the present invention further provides a driving method applied to the laser device of the above embodiment, where the driving method includes:
s1: the controller 10 outputs a current control signal to the constant current driving circuit 30, and controls the constant current driving circuit 30 to output a constant driving current to the laser.
S2: the current driving current condition adjusts the output voltage of the adjustable voltage source 20, so that the constant current driving circuit 30 works in the minimum power consumption state.
S3: when the constant current driving circuit 30 is operated in the minimum power consumption state, the controller 10 obtains the output voltage of the adjustable voltage source 20 as the minimum output voltage of the adjustable voltage source 20.
S4: the controller 10 outputs a voltage control signal to the adjustable voltage source 20 to cause the adjustable voltage source 20 to maintain outputting the minimum output voltage.
Specifically, the controller 10 first outputs a current control signal to the constant current drive circuit 30, so that the constant current drive circuit 30 outputs a drive current to the laser, which is known to be the voltage across the laser from the volt-ampere characteristic of the laser. The controller 10 outputs a voltage control signal to adjust the adjustable voltage source 20, and adjusts the output voltage of the adjustable voltage source 20 to a level that minimizes the power consumption of the constant current driving circuit 30 (the voltage drop across DS of PMOS is limited to the lowest level), and at this time, obtains the output voltage of the adjustable voltage source 20, which is the minimum output voltage. The controller 10 outputs a voltage control signal so that the adjustable voltage source 20 keeps outputting the minimum output voltage, so that the driving system always works in the optimal power consumption state, and power consumption and heat of the whole system are reduced. And the voltage limiting effect can be achieved by utilizing the output voltage of the adjustable voltage source 20 and the volt-ampere characteristic of the laser due to the volt-ampere characteristic curve of the laser.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (7)
1. A driving system of a laser, comprising: the device comprises a controller, an adjustable voltage source and at least two constant current driving circuits, wherein the adjustable voltage source is connected with the constant current driving circuits, the adjustable voltage source and the constant current driving circuits are both connected with the controller, and each constant current driving circuit is used for driving a laser;
The controller is configured to output a current control signal to the constant current driving circuit so that the constant current driving circuit outputs a constant driving current to the laser;
the controller is configured to output a voltage control signal to the adjustable voltage source so that the adjustable voltage source outputs a minimum output voltage to the constant current driving circuit, wherein the minimum output voltage is a minimum voltage allowed by ensuring the constant current driving circuit to work normally under the current driving current condition;
the constant current driving circuit comprises an operational amplifier and a P-type switching tube, wherein the forward input end of the operational amplifier is connected with the controller, the output end of the operational amplifier is connected with the control end of the P-type switching tube, the input end of the P-type switching tube is connected with the adjustable voltage source, and the output end of the P-type switching tube is used for being connected with the laser;
the constant current driving circuit further comprises a feedback unit, one end of the feedback unit is connected between the adjustable voltage source and the input end of the P-type switching tube, the other end of the feedback unit is connected with the reverse input end of the operational amplifier, and the feedback unit forms a negative feedback control loop for the operational amplifier;
the feedback unit includes:
the sampling unit is connected in series between the adjustable voltage source and the input end of the P-type switching tube, and is used for feeding back an acquisition feedback signal to the operational amplifier;
And one end of the proportion adjusting unit is connected between the sampling unit and the input end of the P-type switching tube, the other end of the proportion adjusting unit is connected with the reverse input end of the operational amplifier, and the proportion adjusting unit is used for adjusting the proportion of the feedback signal.
2. The drive system of claim 1, wherein the sampling unit comprises a sampling resistor connected in series between the adjustable voltage source and the input of the P-type switching tube.
3. The driving system according to claim 2, wherein the proportion adjusting unit comprises a first voltage dividing resistor and a second voltage dividing resistor, the first voltage dividing resistor and the second voltage dividing resistor are connected in series and then grounded, the first voltage dividing resistor is connected with the sampling resistor, and an inverting input end of the operational amplifier is connected between the first voltage dividing resistor and the second voltage dividing resistor.
4. A drive system according to claim 3, wherein the minimum output voltage is:
Vmin＝V Excitation device +V Collecting +VP Pipe min
Wherein V min is the minimum output voltage, V Excitation device is the voltage of the laser, V Collecting is the voltage of the sampling resistor, and V P Pipe min is the voltage of the P-type switching tube, where V P Pipe min and V min are positively correlated under the current driving current condition.
5. The drive system according to any one of claims 1 to 4, wherein one of the adjustable voltage sources is provided, and all of the constant current drive circuits are connected to the adjustable voltage source; or alternatively
At least two adjustable voltage sources are arranged, and each adjustable voltage source is independently connected with one constant current driving circuit.
6. A laser device comprising a common cathode laser and a driving system for the laser, the driving system being as claimed in any one of claims 1 to 5, each constant current driving circuit being for driving the common cathode laser.
7. A driving method applied to the laser device of claim 6, the driving method comprising:
The controller outputs a current control signal to the constant current driving circuit to control the constant current driving circuit to output a constant driving current to the laser;
The output voltage of the adjustable voltage source is regulated under the current driving current condition, so that the constant current driving circuit works in the minimum power consumption state;
When the constant current driving circuit works in a minimum power consumption state, the controller acquires the output voltage of the adjustable voltage source as the minimum output voltage of the adjustable voltage source;
The controller outputs a voltage control signal to the adjustable voltage source to cause the adjustable voltage source to maintain outputting the minimum output voltage.
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| CN202111631627.3A CN114300935B (en) | 2021-12-28 | 2021-12-28 | Laser driving system, laser device, and laser driving method |
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| CN202111631627.3A CN114300935B (en) | 2021-12-28 | 2021-12-28 | Laser driving system, laser device, and laser driving method |
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