CN119890911A - Laser diode driving circuit with self-adaptive voltage adjustment function and electronic equipment - Google Patents
Laser diode driving circuit with self-adaptive voltage adjustment function and electronic equipment Download PDFInfo
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- CN119890911A CN119890911A CN202510369454.4A CN202510369454A CN119890911A CN 119890911 A CN119890911 A CN 119890911A CN 202510369454 A CN202510369454 A CN 202510369454A CN 119890911 A CN119890911 A CN 119890911A
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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
- H01S5/00—Semiconductor lasers
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- H01S5/042—Electrical excitation ; Circuits therefor
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Abstract
本申请实施例提供了一种电压自适应调节的激光二极管驱动电路及电子设备，涉及电子技术领域，用于解决如何提高激光二极管的驱动电路中电能转换为光能的转换效率的问题，电路包括：恒压闭环控制电路、恒流闭环控制电路、升/降压开关电路、升/降压开关电路的直流电压输入端和激光二极管；恒压闭环控制电路分别与升/降压开关电路和激光二极管连接；恒压闭环控制电路用于控制升/降压开关电路的控制端电压；升/降压开关电路的直流电压输入端与升/降压开关电路连接；升/降压开关电路与激光二极管连接；升/降压开关电路用于控制激光二极管的电压；激光二极管与恒流闭环控制电路连接；恒流闭环控制电路用于调节激光二极管的电流。
The embodiment of the present application provides a laser diode driving circuit and electronic equipment with voltage adaptive regulation, which relates to the field of electronic technology and is used to solve the problem of how to improve the conversion efficiency of electric energy into light energy in the driving circuit of the laser diode. The circuit includes: a constant voltage closed-loop control circuit, a constant current closed-loop control circuit, a boost/buck switch circuit, a DC voltage input end of the boost/buck switch circuit and a laser diode; the constant voltage closed-loop control circuit is connected to the boost/buck switch circuit and the laser diode respectively; the constant voltage closed-loop control circuit is used to control the control end voltage of the boost/buck switch circuit; the DC voltage input end of the boost/buck switch circuit is connected to the boost/buck switch circuit; the boost/buck switch circuit is connected to the laser diode; the boost/buck switch circuit is used to control the voltage of the laser diode; the laser diode is connected to the constant current closed-loop control circuit; the constant current closed-loop control circuit is used to adjust the current of the laser diode.
Description
Technical Field
The application relates to the technical field of electronics, in particular to a laser diode driving circuit with self-adaptive voltage regulation and electronic equipment.
Background
A Laser Diode is an electronic device that converts current into light energy and generates Laser light using a semiconductor PN junction. For the laser diode to work normally, one possible implementation is to supply the laser diode with a fixed voltage in the driving circuit of the laser diode, but this way causes other devices in the driving circuit to consume a larger amount of electric power, resulting in a lower efficiency of converting electric energy into optical energy. Therefore, how to improve the conversion efficiency of electric energy into light energy in the driving circuit of the laser diode is a technical problem to be solved at present.
Disclosure of Invention
In view of the above problems, the present invention provides a voltage-adaptive adjustment laser diode driving circuit and an electronic device, so as to improve the conversion efficiency of converting electric energy into light energy, and save electric energy, and the specific scheme is as follows:
In a first aspect, an embodiment of the present application provides a laser diode driving circuit with voltage adaptive adjustment, where the circuit includes a constant voltage closed-loop control circuit, a constant current closed-loop control circuit, a step-up/step-down switching circuit, a dc voltage input terminal of the step-up/step-down switching circuit, and a laser diode;
the constant-voltage closed-loop control circuit is respectively connected with the step-up/step-down switching circuit and the laser diode and is used for controlling the voltage of the control end of the step-up/step-down switching circuit;
The direct-current voltage input end of the step-up/step-down switching circuit is connected with the step-up/step-down switching circuit, and the step-up/step-down switching circuit is connected with the laser diode and is used for controlling the voltage of the laser diode;
the laser diode is connected with the constant current closed loop control circuit, and the constant current closed loop control circuit is used for adjusting the current of the laser diode.
Optionally, the constant voltage closed loop control circuit is connected to the step-up/step-down switching circuit and the laser diode, respectively, and includes:
the first end of the constant-voltage closed-loop control circuit is connected with the control end of the step-up/step-down switching circuit;
The second end of the constant-voltage closed-loop control circuit is connected with the positive electrode of the laser diode, and the third end of the constant-voltage closed-loop control circuit is connected with the negative electrode of the laser diode.
Optionally, the step-up/step-down switching circuit is connected to the laser diode, and includes:
and the direct-current voltage output end of the step-up/step-down switching circuit is connected with the cathode of the laser diode.
Optionally, the laser diode is connected with the constant current closed loop control circuit, and includes:
the positive electrode of the laser diode is connected with the constant current closed loop control circuit.
Optionally, the constant voltage closed loop control circuit comprises a first proportional integral amplifying circuit, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor and a setting voltage input end of the constant voltage closed loop control circuit;
The set voltage input end of the constant voltage closed-loop control circuit is connected with one end of the first resistor;
the other end of the first resistor is connected with one end of the first proportional integral amplifying circuit and one end of the second resistor respectively;
The other end of the second resistor is connected with one end of the third resistor and the ground wire respectively;
the other end of the third resistor is connected with one end of the first proportional integral amplifying circuit and one end of the fourth resistor respectively;
the fourth resistor is connected with the laser diode in parallel;
one end of the fifth resistor is connected with the first proportional integral amplifying circuit, and the other end of the fifth resistor is connected with the control end of the step-up/step-down switching circuit.
Optionally, the first proportional integral amplifying circuit comprises a first operational amplifier, a sixth resistor, a seventh resistor and a first capacitor;
one end of the sixth resistor is connected with the connecting end between the first resistor and the second resistor;
The other end of the sixth resistor is respectively connected with the inverting end of the first operational amplifier and one end of the first capacitor;
the other end of the first capacitor is connected with one end of the seventh resistor;
the other end of the seventh resistor is connected with one end of the fifth resistor;
the output end of the first operational amplifier is connected with the connecting end between the seventh resistor and the fifth resistor, and the in-phase end of the first operational amplifier is connected with the connecting end between the third resistor and the fourth resistor.
Optionally, the constant current closed loop control circuit comprises a field effect transistor, a proportional amplifying circuit, an eighth resistor, a ninth resistor and a tenth resistor;
the drain electrode of the field effect tube is connected with the positive electrode of the laser diode;
the grid electrode of the field effect transistor is connected with one end of the eighth resistor, and the other end of the eighth resistor is connected with the proportional amplifying circuit;
one end of the ninth resistor is connected with one end of the tenth resistor, and the other end of the ninth resistor is connected with the proportional amplifying circuit;
The source electrode of the field effect transistor is connected with the connecting end of the ninth resistor and the tenth resistor;
the other end of the tenth resistor is grounded.
Optionally, the proportional amplifying circuit comprises a second capacitor, a second operational amplifier, an eleventh resistor and a twelfth resistor;
one end of the second capacitor is respectively connected with the other end of the eighth resistor and the output end of the second operational amplifier;
the other end of the second capacitor is respectively connected with the other end of the ninth resistor and the inverting end of the second operational amplifier;
one end of the eleventh resistor is connected with one end of the twelfth resistor;
The other end of the eleventh resistor is connected with the set voltage input end of the constant current closed loop control circuit;
the other end of the twelfth resistor is grounded;
The non-inverting terminal of the second operational amplifier is connected with one end of the eleventh resistor, the fourth pin of the second operational amplifier is grounded, and the eighth pin of the second operational amplifier is connected with a power supply.
Optionally, the field effect transistor is any one of a transistor, a field effect transistor and an insulated gate bipolar transistor.
In a second aspect, an embodiment of the present application provides an electronic device, including any one of the above-mentioned laser diode driving circuits with voltage adaptive adjustment.
Compared with the prior art, the application has the following beneficial effects:
The application sets a constant voltage closed loop control circuit, a constant current closed loop control circuit, a step-up/down switch circuit, a direct current voltage input end of the step-up/down switch circuit and a laser diode in a laser diode driving circuit, wherein the constant voltage closed loop control circuit is respectively connected with the step-up/down switch circuit and the laser diode, the direct current voltage input end of the step-up/down switch circuit is connected with the step-up/down switch circuit, the step-up/down switch circuit is connected with the laser diode, and the laser diode is connected with the constant current closed loop control circuit. The constant-voltage closed-loop control circuit is used for controlling the voltage of the control end of the step-up/down switching circuit, the step-up/down switching circuit is used for controlling the voltage of the laser diode, the constant-current closed-loop control circuit is used for adjusting the current of the laser diode, so that the step-up/down switching circuit is used for outputting the dynamically-converted and adjusted voltage to the laser diode, the voltage self-adaptive adjustment control of the laser diode driving circuit is realized, the electric power loss generated on other devices in the circuit is reduced, and the conversion efficiency of converting electric energy into light energy is improved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings may be obtained according to these drawings for a person having ordinary skill in the art.
FIG. 1 is a schematic diagram of a driving circuit for a laser diode, which is provided by an embodiment of the present application and supplies power to the laser diode through a fixed voltage;
Fig. 2 is a schematic structural diagram of a laser diode driving circuit with adaptive voltage adjustment according to an embodiment of the present application;
FIG. 3 is a schematic diagram of a constant voltage closed loop control circuit according to an embodiment of the present application;
Fig. 4 is a schematic structural diagram of a first proportional-integral amplifying circuit according to an embodiment of the present application;
fig. 5 is a schematic structural diagram of a constant current closed loop control circuit according to an embodiment of the present application;
Fig. 6 is a schematic structural diagram of a scaling-up circuit according to an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which are derived by a person skilled in the art based on the embodiments of the application, fall within the scope of protection of the application.
The terms "comprises" and "comprising," along with any variations thereof, in the description and claims of the application and in the foregoing drawings, are intended to cover non-exclusive inclusion, such that a process, method, or apparatus that comprises a series of steps or elements is not necessarily limited to those steps or elements that are expressly listed or inherent to such process, method, product, or apparatus.
The laser diode driving circuit for supplying power to the laser diode through fixed voltage is shown in fig. 1, VCC direct current voltage is connected to the positive electrode of the laser diode, the negative electrode of the laser diode is connected with the drain electrode of the field effect transistor, when the constant current control module is provided with set voltage input, the constant current control module controls the resistance value change of the drain electrode and the source electrode of the field effect transistor through the voltage of the grid electrode of the driving field effect transistor to realize current limiting and voltage division in the series circuit, VCC current forms a loop through the laser diode, the field effect transistor and a sampling resistor, and the current flows through the sampling resistor to generate voltage to be fed back to the constant current control module to form constant current closed loop control.
As can be seen from fig. 1, the laser diode, the field effect transistor, and the sampling resistor are connected in series, and when the VCC voltage is 5V, the turn-on voltage of the laser diode is about 2V, and the current flowing through the series loop is 1A, the voltage across the field effect transistor and the sampling resistor is 3V, and the consumed electric power across the field effect transistor and the sampling resistor is about 3W according to the electric power calculation formula p=ui. When the current through the series loop is 10A, the power consumption on the field effect transistor and the sampling resistor is approximately equal to 30W, and so on.
Because the VCC voltage is fixed, the electric power consumed by the field effect transistor and the sampling resistor is larger and larger along with the continuous increase of the current, so that the field effect transistor and the sampling resistor in the driving circuit need to consume larger electric power, and the efficiency of converting electric energy into light energy is lower. In addition, if the power consumption on the sampling resistor is reduced by reducing the value of the sampling resistor, the power consumption on the field effect transistor is increased, and the field effect transistor with higher power is required to meet the bearing capacity of high current, so that the price of the field effect transistor with higher power is higher. And, the waste heat generated by consuming electric power on the field effect tube also needs to add an extra heat dissipation cooling system, which is inconvenient for miniaturizing the equipment. In order to solve the above problems, the present application provides a voltage-adaptive-adjustment laser diode driving circuit and an electronic device, which are specifically as follows.
As shown in fig. 2, the present application provides a voltage-adaptively adjusted laser diode driving circuit, which comprises a constant voltage closed-loop control circuit 201, a constant current closed-loop control circuit 203, a step-up/step-down switching circuit 202, a direct current voltage input terminal Vin of the step-up/step-down switching circuit 202, and a laser diode D1;
The constant voltage closed-loop control circuit 201 is respectively connected with the step-up/down switch circuit 202 and the laser diode D1, wherein the constant voltage closed-loop control circuit 201 is used for controlling the voltage of the control terminal of the step-up/down switch circuit 202;
the direct-current voltage input end Vin of the step-up/step-down switching circuit 202 is connected with the step-up/step-down switching circuit 202, the step-up/step-down switching circuit 202 is connected with the laser diode D1, and the step-up/step-down switching circuit 202 is used for controlling the voltage of the laser diode D1;
The laser diode D1 is connected with a constant current closed loop control circuit 203, and the constant current closed loop control circuit 203 is used for adjusting the current of the laser diode D1.
Specifically, a first end of the constant voltage closed-loop control circuit 201 is connected to a control end Trim of the step-up/down switching circuit 202, a second end of the constant voltage closed-loop control circuit 201 is connected to a negative electrode of the laser diode D1, and a third end of the constant voltage closed-loop control circuit 201 is connected to a positive electrode of the laser diode D1.
The dc voltage output terminal Vout of the step-up/down switching circuit 202 is connected to the positive electrode of the laser diode D1. The cathode of the laser diode D1 is connected to the constant current closed-loop control circuit 203. The step-up/step-down switching circuit 202 is specifically configured to regulate the voltage input by the dc voltage input terminal Vin based on the input voltage of the control terminal Trim until the voltage of the dc voltage output terminal Vout is within the voltage range set by the set voltage input terminal Vset.
The voltage of the control end of the step-up/down switch circuit 202 is controlled by the constant voltage closed-loop control circuit 201 to control the output end of the step-up/down switch circuit 202 to output the dynamically-converted and adjusted voltage to the laser diode D1, so that the voltage self-adaptive regulation control of the laser diode driving circuit is realized, and compared with the case that a fixed power supply is adopted to supply power to the laser diode, the power loss generated by the current on other devices in the circuit can be effectively reduced, and the conversion efficiency of converting electric energy into light energy is improved.
As shown in fig. 3, in an alternative embodiment, the constant voltage closed loop control circuit 201 includes a first proportional integral amplifying circuit 301, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, and a set voltage input Vset of the constant voltage closed loop control circuit 201;
The set voltage input end of the constant voltage closed loop control circuit 201 is connected with one end of the first resistor R1;
the other end of the first resistor R1 is respectively connected with one ends of the first proportional integral amplifying circuit 301 and the second resistor R2;
the other end of the second resistor R2 is respectively connected with one end of the third resistor R3 and the ground wire;
the other end of the third resistor R3 is respectively connected with one ends of the first proportional integral amplifying circuit 301 and the fourth resistor R4;
the fourth resistor R4 is connected with the laser diode D1 in parallel;
one end of the fifth resistor R5 is connected to the first proportional-integral amplifying circuit 301, and the other end of the fifth resistor R5 is connected to the control end of the step-up/step-down switching circuit 202.
When the voltage of the set voltage input terminal Vset of the constant voltage closed-loop control circuit 201 is not set, the dc voltage output terminal Vout of the step-up/down switching circuit 202 does not output a voltage. When the voltage is present at the set voltage input terminal Vset, the voltage is divided by the first resistor R1 and the second resistor R2 and then input to the first proportional-integral amplifying circuit 301.
As shown in fig. 4, in an alternative embodiment, the first proportional-integral amplifying circuit 301 includes a first operational amplifier U1A, a sixth resistor R6, a seventh resistor R7, and a first capacitor C1;
One end of the sixth resistor R6 is connected with the connecting end between the first resistor R1 and the second resistor R2;
the other end of the sixth resistor R6 is respectively connected with the inverting end of the first operational amplifier U1A and one end of the first capacitor C1;
the other end of the first capacitor C1 is connected with one end of a seventh resistor R7;
the other end of the seventh resistor R7 is connected with one end of the fifth resistor R5;
The output end of the first operational amplifier U1A is connected with the connecting end between the seventh resistor R7 and the fifth resistor R5, and the non-inverting end of the first operational amplifier U1A is connected with the connecting end between the third resistor R3 and the fourth resistor R4.
The first proportional-integral amplifying circuit 301 is composed of a first operational amplifier U1A, a sixth resistor R6, a seventh resistor R7, and a first capacitor C1. The first operational amplifier U1A has a pin 5 at the in-phase end, a pin 6 at the opposite-phase end, and a pin 7 at the output end. The first operational amplifier U1A may also be composed of a plurality of transistors or a plurality of field effect transistors.
When the set voltage input terminal Vset has a voltage, the voltage is divided by the first resistor R1 and the second resistor R2 and then input to the first proportional-integral amplifying circuit 301. Since the dc voltage output terminal Vout has no output voltage, the in-phase terminal of the first operational amplifier U1A is equivalent to ground, and according to the principle that the voltages of the in-phase terminal and the inverting terminal of the operational amplifier are equal, when the input voltage of the inverting terminal is greater than the in-phase terminal, the voltage output by the first proportional-integral amplifying circuit is close to 0 v. The output voltage of the dc voltage output terminal Vout is adjusted by the buck-boost switching circuit 202 according to the input value of the control terminal Trim, which is limited by the fifth resistor R5. After the voltage of the dc voltage output terminal Vout is divided by the third resistor R3 and the fourth resistor R4, the dc voltage output terminal Vout is fed back to the in-phase terminal of the first operational amplifier U1A, so that the first proportional-integral amplifying circuit 301 outputs an adjusted voltage value to the control terminal Trim according to a preset proportional-amplification and integral time. The constant voltage closed loop control circuit 201 performs the above circuit actions in a cyclic manner until the voltage output from the dc voltage output terminal Vout is stabilized within the voltage range set by the set voltage input terminal Vset, thereby realizing constant voltage closed loop control.
It should be noted that, in the present application, the proportional-integral time may be configured by setting the parameter values of the sixth resistor R6, the seventh resistor R7, and the first capacitor C1. When the parameter values of the sixth resistor R6, the seventh resistor R7 and the first capacitor C1 are preset values, the fast adaptive adjustment of the dc voltage output terminal Vout during the light-heavy load switching can be realized.
As shown in fig. 5, the constant current closed-loop control circuit 203 includes a power transistor Q1, and the power transistor Q1 may be any one of a transistor, a field effect transistor, and an insulated gate bipolar transistor. The present application will be described below by taking the power transistor Q1 as an example.
Specifically, the constant current closed-loop control circuit 203 comprises a field effect transistor Q1, a proportional amplifying circuit 501, an eighth resistor R8, a ninth resistor R9 and a tenth resistor R10;
the drain electrode of the field effect transistor Q1 is connected with the cathode of the laser diode D1;
The grid electrode of the field effect transistor Q1 is connected with one end of an eighth resistor R8, and the other end of the eighth resistor R8 is connected with the proportional amplifying circuit 501;
One end of the ninth resistor R9 is connected with one end of the tenth resistor R10, and the other end of the ninth resistor R9 is connected with the proportional amplifying circuit 501;
the source electrode of the field effect transistor Q1 is connected with the connecting end of the ninth resistor R9 and the tenth resistor R10;
the other end of the tenth resistor R10 is grounded.
Specifically, the tenth resistor R10 is a sampling resistor. To reduce the electrical power consumption of the sampling resistor, the resistance value of the sampling resistor may be selected based on the magnitude of the actual current of the constant current closed loop control circuit 203, e.g., the resistance value of the sampling resistor may be in the range of a few milliohms to a few hundred milliohms.
Because the electric power loss generated by the field effect tube Q1 is smaller, the power bearing requirement of the field effect tube Q1 is reduced, the required volume of the field effect tube Q1 is smaller, the cost is reduced, and the volume and the cost control of the laser diode driving circuit are facilitated. In addition, because the electric power loss generated by the field effect tube Q1 is smaller, the waste heat generated by the field effect tube Q1 is reduced, and the heat dissipation requirement is lower, so that a heat dissipation cooling system is not required, or a small-size heat dissipation cooling system is adopted, the miniaturization design of the laser diode driving circuit is facilitated, and the cost is further reduced. In addition, as the constant-current closed-loop control is a linear control mode, the field effect transistor Q1 is in linear conduction and is resistive, high-frequency voltage current ripple caused by direct current power supply of the laser diode D1 can be effectively blocked, and the problems that the service life of the laser diode D1 is influenced by the high-frequency voltage current ripple, and the stability and efficiency of laser amplification are influenced due to unstable laser emitted by the laser diode D1 and poor signal-to-noise ratio are avoided.
As shown in fig. 6, in an alternative embodiment, the proportional amplifying circuit 501 includes a second capacitor C2, a second operational amplifier U1B, an eleventh resistor R11, and a twelfth resistor R12;
one end of the second capacitor C2 is respectively connected with the other end of the eighth resistor R8 and the output end of the second operational amplifier U1B;
The other end of the second capacitor C2 is respectively connected with the other end of the ninth resistor R9 and the inverting end of the second operational amplifier U1B;
One end of the eleventh resistor R11 is connected to one end of the twelfth resistor R12;
The other end of the eleventh resistor R11 is connected with a set voltage input end Iset of the constant current closed-loop control circuit 203;
The other end of the twelfth resistor R12 is grounded;
The non-inverting terminal of the second operational amplifier U1B is connected with one end of an eleventh resistor R11, the fourth pin of the second operational amplifier U1B is grounded, and the eighth pin of the second operational amplifier U1B is connected with a power supply.
Specifically, the proportional amplifying circuit 501 is constituted by a second capacitor C2, a second operational amplifier U1B, an eleventh resistor R11, and a twelfth resistor R12. The output end of the second operational amplifier U1B is a pin 1, the same-phase end is a pin 3, and the opposite-phase end is a pin 2. The resistance of the third resistor R3 and the fourth resistor R4 is larger than the resistance of a current loop formed by the laser diode D1, the field effect transistor Q1 and the tenth resistor R10. The second operational amplifier U1B may also be composed of a plurality of transistors or a plurality of field effect transistors.
The second capacitor C2 plays a role in inhibiting current overshoot and oscillation in the current switching process, so that the rising edge time and the falling edge time of the switching current are regulated within a certain range by changing the capacitance value of the second capacitor C2.
When the voltage of the set voltage input terminal Iset of the constant current closed-loop control circuit 203 is not set, the output voltage of the second operational amplifier U1B is close to 0 v, the field effect transistor Q1 is turned off, and no current flows through the laser diode D1. When there is a voltage input at the set voltage input terminal Iset of the constant current closed loop control circuit 203, the voltage is divided by the eleventh resistor R11 and the twelfth resistor R12 and then input to the non-inverting terminal of the second operational amplifier U1B. The output voltage of the output end of the second operational amplifier U1B is limited by an eighth resistor and then drives the grid electrode of the field effect transistor Q1, and the current of the direct-current voltage output end Vout passes through the laser diode D1, the field effect transistor Q1 and the tenth resistor to form a loop. The current flows through the tenth resistor R10 to generate voltage, and the voltage is fed back to the inverting terminal of the second operational amplifier through the ninth resistor R9 to form constant current closed loop control, and the field effect transistor Q1 is conducted linearly.
Since the resistance values of the third resistor R3 and the fourth resistor R4 are far greater than the resistance of the current loop formed by the laser diode D1, the field-effect transistor Q1 and the tenth resistor R10, the voltage division of the resistors in the current loop formed by the laser diode D1, the field-effect transistor Q1 and the tenth resistor R10 is far lower than the voltage division of the resistors in the current loop formed by the third resistor R3 and the fourth resistor R4. At this time, the voltage fed back to the non-inverting terminal of the first operational amplifier U1A is the voltage on the drain of the field effect transistor Q1, and the first operational amplifier U1A automatically adjusts the voltage output from the dc voltage output terminal Vout of the step-up/step-down switching circuit 202 according to the proportional-integral time and the feedback voltage of the first capacitor C1, the sixth resistor R6 and the seventh resistor R7, so as to adapt to the adjustment of the current level of the laser diode D1 in the constant current closed loop control circuit 203.
Based on the voltage-adaptive adjustment laser diode driving circuit shown in fig. 6 and the electric power calculation formula p=ui, it can be known that in the series loop formed by the laser diode D1, the field effect transistor Q1 and the tenth resistor R10, the application can effectively reduce the electric power loss generated on the field effect transistor by reducing the terminal voltage between the drain electrode and the source electrode of the field effect transistor Q1, and improve the efficiency of converting electric power into light energy.
The controllable step-up/step-down switch circuit 202 is adopted to realize the voltage conversion from the direct-current voltage input end Vin to the direct-current voltage output end Vout, the conversion efficiency can reach 95% -98%, the output voltage of the direct-current voltage output end Vout is dynamically regulated in a closed loop mode to supply power to the laser diode, and the driving control of the laser diode with self-adaptive voltage regulation is realized. In addition, the output voltage value of the direct-current voltage output end Vout supports voltage self-adaptive adjustment, so that the application supports the simultaneous driving of a plurality of laser diodes connected in series.
Since the switching main frequency of the step-up/step-down switching circuit 202 is high enough, the output voltage of the dc voltage output terminal Vout can be quickly and adaptively adjusted during light-heavy load switching, and the technical scheme supports the operation of the pulse constant current mode, and a reasonable output voltage can be set for the dc voltage output terminal Vout according to the voltage and current parameters of the laser diode D1, so that a current modulation frequency signal is loaded at the set voltage input terminal Iset through the device parameters in the energy storage capacitance value adjusting circuit, and the operation of the pulse constant current mode with the frequency of 0-5M can be realized.
The application also provides electronic equipment, which comprises the laser diode driving circuit with any voltage self-adaptive adjustment.
In this specification, each embodiment is described in a progressive manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments. In particular, for the electronic device embodiments, since they are substantially similar to the circuit embodiments, the description is relatively simple, and reference is made to the description of the circuit embodiments in part. The above-described embodiments of the electronic device are merely illustrative, in that the units and modules illustrated as separate components may or may not be physically separate. In addition, some or all of the units and modules can be selected according to actual needs to achieve the purpose of the embodiment scheme. Those of ordinary skill in the art will understand and implement the present invention without undue burden.
It should be understood that in the present application, "at least one (item)" means one or more, and "a plurality" means two or more. "and/or" is used to describe an association relationship of an associated object, and indicates that three relationships may exist, for example, "a and/or B" may indicate that only a exists, only B exists, and three cases of a and B exist simultaneously, where a and B may be singular or plural. The character "/" generally indicates that the context-dependent object is an "or" relationship. "at least one of" or the like means any combination of these items, including any combination of single item(s) or plural items(s). For example, at least one of a, b or c may represent a, b, c, "a and b", "a and c", "b and c", or "a and b and c", wherein a, b, c may be single or plural.
The above is merely a preferred embodiment of the present application, and is not intended to limit the present application in any way. While the application has been described with reference to preferred embodiments, it is not intended to be limiting. Any person skilled in the art can make many possible variations and modifications to the technical solution of the present application or modifications to equivalent embodiments using the methods and technical contents disclosed above, without departing from the scope of the technical solution of the present application. Therefore, any simple modification, equivalent variation and modification of the above embodiments according to the technical substance of the present application still fall within the scope of the technical solution of the present application.
Claims (10)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202510369454.4A CN119890911B (en) | 2025-03-27 | 2025-03-27 | Laser diode driving circuit with self-adaptive voltage adjustment function and electronic equipment |
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| CN202510369454.4A CN119890911B (en) | 2025-03-27 | 2025-03-27 | Laser diode driving circuit with self-adaptive voltage adjustment function and electronic equipment |
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| CN119890911B CN119890911B (en) | 2025-06-10 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5666045A (en) * | 1994-12-09 | 1997-09-09 | Psc Inc. | Laser drive and control systems useful for laser diode protection |
| CN103138225A (en) * | 2011-11-28 | 2013-06-05 | 西安电子科技大学 | Design method of driving source of diode pumped laser |
| CN112436719A (en) * | 2021-01-27 | 2021-03-02 | 中科慧远视觉技术(北京)有限公司 | PWM constant-current double-feedback laser driving circuit |
| CN217239989U (en) * | 2022-06-06 | 2022-08-19 | 深圳市洛仑兹技术有限公司 | Laser constant current source drive circuit |
| CN117559208A (en) * | 2024-01-11 | 2024-02-13 | 北京盛镭科技有限公司 | Power amplifier of master oscillator and master oscillator |
| CN117856033A (en) * | 2022-10-08 | 2024-04-09 | 北京一径科技有限公司 | Constant current driving circuit, laser pumping source and laser radar |
-
2025
- 2025-03-27 CN CN202510369454.4A patent/CN119890911B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5666045A (en) * | 1994-12-09 | 1997-09-09 | Psc Inc. | Laser drive and control systems useful for laser diode protection |
| CN103138225A (en) * | 2011-11-28 | 2013-06-05 | 西安电子科技大学 | Design method of driving source of diode pumped laser |
| CN112436719A (en) * | 2021-01-27 | 2021-03-02 | 中科慧远视觉技术(北京)有限公司 | PWM constant-current double-feedback laser driving circuit |
| CN217239989U (en) * | 2022-06-06 | 2022-08-19 | 深圳市洛仑兹技术有限公司 | Laser constant current source drive circuit |
| CN117856033A (en) * | 2022-10-08 | 2024-04-09 | 北京一径科技有限公司 | Constant current driving circuit, laser pumping source and laser radar |
| CN117559208A (en) * | 2024-01-11 | 2024-02-13 | 北京盛镭科技有限公司 | Power amplifier of master oscillator and master oscillator |
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| CN119890911B (en) | 2025-06-10 |
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