CN112134145B

CN112134145B - VCSEL drive circuit and device

Info

Publication number: CN112134145B
Application number: CN202011309187.5A
Authority: CN
Inventors: 杜灿鸿; 林玉波
Original assignee: Shenzhen Goodix Technology Co Ltd
Current assignee: Shenzhen Goodix Technology Co Ltd
Priority date: 2020-11-20
Filing date: 2020-11-20
Publication date: 2021-03-23
Anticipated expiration: 2040-11-20
Also published as: CN112134145A

Abstract

The application provides a VCSEL drive circuit and a VCSEL drive device. The VCSEL drive circuit includes: the device comprises a drive control unit and a power supply unit connected with the drive control unit; the driving control unit is used for controlling the turn-on or turn-off of the VCSEL according to the input pulse signal and outputting a voltage control signal according to an optical power sensing signal of the VCSEL and a preset working current setting signal of the VCSEL; the power supply unit is used for controlling the voltage supplied to the VCSEL according to the voltage control signal. Thus, the driving loss is reduced while the VCSEL current is ensured to be constant.

Description

VCSEL drive circuit and device

Technical Field

The present disclosure relates to circuit technologies, and in particular, to a Vertical Cavity Surface Emitting Laser (VCSEL) driving circuit and device.

Background

VCSELs are widely used as illumination sources in the prior art, for example, in the 3D Time of Flight (3D ToF) imaging technology, i.e., VCSELs are required as illumination sources. The imaging principle of 3D ToF determines the need for switching the VCSEL to be driven during imaging.

In the related art, the driving circuit of the VCSEL generally controls the driving of the VCSEL by controlling the transistors inside the driving circuit to be turned on or off. In a specific implementation, in order to keep the VCSEL stably emitting light, the driving circuit generally adopts a constant current driving mode. In the constant current driving mode, the driving voltage of the transistor in the driving circuit is controlled to control the driving current to keep constant, so that the optical power of the VCSEL keeps constant, and the VCSEL is kept to stably emit light. However, in such a constant current driving mode, the conduction voltage drop of the transistor in the driving circuit is high, which results in a large driving loss and a low driving efficiency.

Disclosure of Invention

The application provides a VCSEL drive circuit and device, has reduced drive loss, has higher drive efficiency.

In a first aspect, the present application provides a VCSEL driving circuit, including: the device comprises a drive control unit and a power supply unit connected with the drive control unit;

the driving control unit is used for controlling the turn-on or turn-off of the VCSEL in a switch driving mode according to an input pulse signal and outputting a voltage control signal according to an optical power sensing signal of the VCSEL and a preset working current setting signal of the VCSEL;

the power supply unit is used for controlling the voltage supplied to the VCSEL according to the voltage control signal so as to enable the current when the VCSEL is switched on to be a preset working current.

In one possible implementation, the driving control unit includes a driving unit, an optical power sensing unit, and a control unit;

the first end of the driving unit is connected with the input pulse signal; the second end of the driving unit is a VCSEL driving signal end; the input end of the optical power sensing unit is connected with the photodiode or the second end of the driving unit; the output end of the optical power sensing unit is connected with the first input end of the control unit; a second input end of the control unit is a signal input end for setting the preset working current; the output end of the control unit is connected with the power supply unit;

the driving unit is used for controlling the VCSEL to be switched on or switched off according to the input pulse signal;

the optical power sensing unit is used for acquiring an optical power sensing signal of the VCSEL;

and the control unit is used for determining a voltage control signal according to the optical power sensing signal and the preset working current setting signal.

In one possible implementation, the driving unit includes a switch driving circuit and a first switch tube;

the input end of the switch driving circuit is connected with the input pulse signal; the output end of the switch driving circuit is connected with the first end of the first switch tube; the second end of the first switching tube is a VCSEL driving signal end; the third end of the first switch tube is grounded;

the switch driving circuit is used for controlling the first switch tube to be in an on state according to the input pulse signal so as to control the VCSEL to be switched on, or controlling the first switch tube to be in an off state according to the input pulse signal so as to control the VCSEL to be switched off.

In a possible implementation manner, an input end of the optical power sensing unit is connected with the photodiode, and the optical power sensing unit includes a first operational amplifier unit and a first timing control unit;

the first operational amplifier unit is connected with the photodiode, and the input end of the first timing control unit is connected with the input pulse signal; the output end of the first time sequence control unit is connected with the first operational amplifier unit;

the photodiode is used for detecting the light intensity of the VCSEL;

the first timing control unit is used for controlling the first operational amplifier unit to output the optical power sensing signal according to the light intensity when the VCSEL is conducted.

In a possible implementation manner, the optical power sensing unit includes a second operational amplifier unit and a second timing control unit;

the second operational amplifier unit is connected with the second end of the first switching tube; the input end of the second time sequence control unit is connected with the input pulse signal; the output end of the second time sequence control unit is connected with the second operational amplifier unit;

the second timing control unit is used for controlling the second operational amplifier unit to output the optical power sensing signal according to the voltage on the first switching tube when the VCSEL is conducted.

In a possible implementation manner, the third terminal of the first switching tube is grounded through a first resistor; the optical power sensing unit comprises a third operational amplifier unit and a third time sequence control unit;

the third operational amplifier unit is connected with the third end of the first switching tube; the input end of the third time sequence control unit is connected with the input pulse signal; the output end of the third time sequence control unit is connected with the third operational amplifier unit;

the third timing control unit is configured to control the third operational amplifier unit to output the optical power sensing signal according to a voltage across the first resistor when the VCSEL is turned on.

In one possible implementation, the control unit includes: the device comprises an analog-to-digital conversion unit, an error correction unit and a digital-to-analog conversion unit;

the analog-to-digital conversion unit is used for converting the optical power sensing signal into a digital sensing signal;

the error correction unit is used for determining a digital voltage control signal corresponding to the current pulse signal according to the digital sensing signal, a preset working current setting signal and a prestored digital voltage control signal corresponding to the last pulse signal;

the digital-to-analog conversion unit is used for converting the digital voltage control signal corresponding to the current pulse signal into the voltage control signal.

In one possible implementation, the control unit includes: the analog subtractor, the analog adder and the analog memory are connected in series;

a first input end of the analog subtractor is connected with an output end of the optical power sensing unit, and a second input end of the analog subtractor is a signal input end for setting the preset working current; the first input end of the analog adder is connected with the output end of the analog subtractor and the output end of the analog memory respectively, the second input end of the analog adder is grounded, and the output end of the analog adder is connected with the power supply unit; the input end of the analog memory is connected with the output end of the analog adder;

the analog subtractor is used for determining an error signal according to the preset working current setting signal and the optical power sensing signal;

the analog memory is used for outputting a voltage control signal corresponding to the last pulse signal;

and the analog adder is used for outputting the voltage control signal according to the error signal and the voltage control signal corresponding to the last pulse signal.

In one possible implementation, the power supply unit includes: the first feedback amplifier, the first regulating tube and the first voltage regulating circuit;

the in-phase end of the first feedback amplifier is connected with the output end of the driving control unit; the inverting terminal of the first feedback amplifier is connected with the first voltage regulating circuit; the input end of the first regulating tube is connected with the output end of the first feedback amplifier; the output end of the first regulating tube is connected with the first voltage regulating circuit, and the output end of the first regulating tube outputs the power supply voltage of the VCSEL;

the first regulating tube is used for regulating the voltage supplied to the VCSEL under the control of the first feedback amplifier and the first voltage regulating circuit.

In one possible implementation, the first voltage regulating circuit includes a second resistor and a third resistor;

the first end of the second resistor is connected with the reverse end of the feedback amplifier, and the second end of the second resistor is connected with the output end of the regulating tube; the first end of the third resistor is connected with the first end of the second resistor, and the second end of the third resistor is grounded.

In one possible implementation, the power supply unit includes: the second feedback amplifier, the second regulating tube and the second voltage regulating circuit;

the non-inverting end of the second feedback amplifier is connected with a reference voltage signal; the inverting terminal of the second feedback amplifier is connected with the second voltage regulating circuit; the second voltage regulating circuit is also connected with the output end of the driving control unit; the input end of the second regulating tube is connected with the output end of the second feedback amplifier; the output end of the second regulating tube is connected with the second voltage regulating circuit; the output end of the second regulating tube outputs the power supply voltage of the VCSEL;

the first regulating tube is used for regulating the voltage supplied to the VCSEL under the control of the first feedback amplifier and the second voltage regulating circuit.

In one possible implementation, the second voltage regulating circuit includes a fourth resistor, a fifth resistor, and a sixth resistor;

a first end of the fourth resistor is connected with an inverting end of the second feedback amplifier, a first end of the fifth resistor and a first end of the sixth resistor respectively; the second end of the fourth resistor is connected with the output end of the regulating tube; the second end of the fifth resistor is connected with the output end of the driving control unit; and the second end of the sixth resistor is grounded.

In a second aspect, the present application provides a VCSEL module, including a VCSEL driving circuit and a VCSEL; the first end of the VCSEL driving circuit is connected with the anode of the VCSEL and used for supplying power to the VCSEL; the second end of the VCSEL drive circuit is connected with the cathode of the VCSEL and used for controlling the VCSEL to be switched on or off according to an input pulse signal, and the VCSEL is used for emitting an optical signal under the control of the VCSEL drive circuit;

the VCSEL driving circuit is the VCSEL driving circuit in the first aspect.

In a third aspect, the present application provides a VCSEL driving chip including the VCSEL driving circuit described in the first aspect.

In a fourth aspect, the present application provides a VCSEL driving method applied to the VCSEL driving circuit in the first aspect, the method including:

acquiring an optical power sensing signal of the VCSEL;

supplying power to the VCSEL according to the optical power sensing signal and a preset operating current setting signal of the VCSEL.

A fifth method is provided, wherein the electronic device comprises an image sensor and the VCSEL module as in the second aspect, wherein an optical signal emitted by the VCSEL module is reflected by a target object, and then a corresponding optoelectronic signal is generated by the image sensor, and the optoelectronic signal is used to calculate a distance between the target object and the electronic device.

The application provides a VCSEL drive circuit and a device, the VCSEL drive circuit controls the voltage for supplying power to the VCSEL based on a VCSEL optical power sensing signal and a VCSEL preset working current setting signal, and therefore the conduction current of the VCSEL can be kept constant. In addition, when the conduction current of the VCSEL needs to be changed, different preset working currents are set through the preset working current setting signal, and the fact that the conduction current of the VCSEL is adjustable can be achieved. Because the conduction current of the VCSEL is adjusted by adjusting the power supply voltage of the VCSEL, namely the VCSEL driving circuit is in a switch driving mode, compared with a constant current driving mode, the driving loss is reduced, the driving efficiency is higher, and the constancy and adjustability of the VCSEL current are ensured.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.

Fig. 1 is a schematic structural diagram of a VCSEL driving circuit in the prior art;

FIG. 2 is a graph of voltage and current waveforms for a VCSEL driver circuit of the prior art;

FIG. 3 is a graph of the output characteristics of a transistor used in the VCSEL driver circuit of FIG. 1;

fig. 4 is a block diagram of a VCSEL driving circuit according to an embodiment of the present disclosure;

FIG. 5 is a schematic structural diagram of one embodiment of a driving control unit in the VCSEL driving circuit shown in FIG. 4;

fig. 6 is a schematic structural diagram of another embodiment of a driving control unit in the VCSEL driving circuit shown in fig. 4;

FIG. 7 is a schematic structural diagram of an embodiment of a driving unit in the driving control unit shown in FIG. 5 or FIG. 6;

FIG. 8 is a schematic structural diagram of an embodiment of an optical power sensing unit in the driving control unit shown in FIG. 5;

FIG. 9 is a schematic structural diagram of an embodiment of an optical power sensing unit in the driving control unit shown in FIG. 6;

FIG. 10 is a schematic structural diagram of another embodiment of an optical power sensing unit in the driving control unit shown in FIG. 6;

FIG. 11 is a schematic structural diagram of an embodiment of a control unit in the drive control unit shown in FIG. 5 or FIG. 6;

FIG. 12 is a schematic structural diagram of another embodiment of a control unit in the drive control unit shown in FIG. 5 or FIG. 6;

FIG. 13 is a schematic diagram of an embodiment of a power supply unit in the VCSEL driver circuit shown in FIG. 4;

FIG. 14 is a schematic diagram of another embodiment of a power supply unit in the VCSEL driver circuit of FIG. 4;

fig. 15 is a schematic structural diagram of a VCSEL driving circuit according to an embodiment of the present disclosure;

fig. 16 is a schematic structural diagram of another VCSEL driving circuit according to an embodiment of the present disclosure.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The VCSEL driving circuit provided by the application can be applied to 3D ToF imaging, ToF depth detection and other scenes which need to switch and drive the VCSEL, and can also be applied to other scenes which need to switch and drive the VCSEL, which is not limited in the application. A VCSEL driving circuit in the related art will be first described below.

Fig. 1 is a schematic structural diagram of a VCSEL driving circuit in the prior art. As shown in fig. 1, the power supply unit 11 supplies a power supply voltage VDD, which is a fixed value, to the VCSEL, and the transistor Q0 in the driving unit 12 is controlled by an input pulse signal to perform high-speed switching. When transistor Q0 is off, the VCSEL current is zero; when the transistor Q0 is turned on, the magnitude of the current through the VCSEL depends on the driving mode of the driving circuit 120 of Q0. Fig. 2 is a diagram illustrating voltage and current waveforms of a VCSEL driving circuit according to the prior art. Where Ud is the voltage waveform of transistor Q0 and Vds is the turn-on voltage drop of transistor Q0.

The driving mode of the driving circuit 120 is determined by the circuit configuration, for example, the driving circuit 120 may be implemented by a driving circuit in a switching driving mode, or the driving circuit 120 may be implemented by a driving circuit in a constant current driving mode. It should be noted that the current setting signal SET indicated by a dotted line in fig. 1 is only used for indicating that the driving circuit 120 is a driving circuit in the constant current driving mode, and is a signal for setting the magnitude of the constant current; when the driving circuit 120 is a driving circuit of a switching driving mode, the current setting signal SET is not required.

When the driving circuit 120 is implemented by using a driving circuit of a switching driving mode, the on-current Id of the VCSEL depends on the power supply voltage VDD provided by the power supply unit 11, the on-resistance Rds of the transistor Q0, and the on-voltage drop VF of the VCSEL. Specifically, since Vds = Id Rds, VDD = Vds + VF = Id Rds + VF.

At constant temperature, VDD, VF and Rds are fixed, and therefore Id is also fixed, i.e. the on-current of the VCSEL is not adjustable. However, in practical applications, for example, when the brightness of the VCSEL needs to be adjusted, the on-current Id of the VCSEL needs to be adjusted, and such a circuit obviously cannot meet the requirement of the application. On the other hand, when the temperature varies, there is a significant temperature drift in the turn-on voltage drop VF of the VCSEL and the turn-on voltage drop Rds of the transistor Q0, which may cause the turn-on current Id of the VCSEL to be practically non-constant, so that the VCSEL optical power is not constant.

In another case, when the driving circuit 120 is implemented by using a driving circuit in a constant current driving mode, the on current Id of the transistor Q0, i.e., the on current Id of the VCSEL, is controlled by the current magnitude SET by the external current setting signal SET. The problem existing in the switch driving mode can be improved to a certain extent by the mode, namely that the conduction current of the VCSEL can be adjusted by changing the current SET by the current setting signal SET, and the problem of temperature drift can be improved to a certain extent by the driving circuit in the constant current driving mode, but the constant current driving can generate an additional power consumption problem. The power consumption problem is explained below with reference to the implementation principle of constant current driving.

In the constant current driving mode, the driving circuit 120 controls the output voltage thereof, i.e., controls the driving voltage VGS of the transistor Q0, to make the transistor Q0 generate the constant current effect according to the output characteristics of the transistors, and when the driving voltage VGS is different, the on current Id of the transistor Q0 is different, i.e., the on current Id of the VCSEL is different. However, in this driving mode, the transistor Q0 operates in a linear amplification region, which causes the turn-on voltage drop Vds of the transistor Q0 to be large, resulting in large loss and serious heat generation of the transistor Q0.

For example, fig. 3 is an output characteristic diagram of a transistor used in the VCSEL driving circuit shown in fig. 1, and curves 1-4 in fig. 3 respectively illustrate the output characteristics of the transistor under different driving voltages VGS, where a circle portion is a constant current region of the transistor. Assuming that the on-resistance Rds of the transistor Q0 is 0.1ohm, taking Id =6A as an example, the on-voltage drop Vds of the transistor Q0 in the switching drive mode is =6A × 0.1ohm =0.6V, and in the constant current drive mode, it is known that the on-voltage drop Vds of the transistor Q0 is >1.25V as an example in fig. 3, that is, the loss of the transistor Q0 in the constant current drive mode is greater than 1 time or more than in the switching drive mode.

The application provides a VCSEL drive circuit, this VCSEL drive circuit controls the voltage size of supplying power to VCSEL based on VCSEL luminous power and the preset operating current setting signal of VCSEL, when the conduction current of VCSEL changes, for example when the conduction current changes because the VCSEL temperature changes, VCSEL drive circuit adjusts supply voltage according to the change of the luminous power sensing signal of VCSEL, make the conduction current of VCSEL produce the reverse change that can offset the temperature drift, thereby make the conduction current of VCSEL keep invariable at preset operating current. The VCSEL driving circuit of the present application is described below with reference to embodiments.

Fig. 4 is a block diagram of a VCSEL driving circuit according to an embodiment of the present disclosure. As shown in fig. 4, the VCSEL driving circuit includes: a drive control unit 41 and a power supply unit 42. For clearly illustrating the operation principle of the VCSEL driving circuit, the connection relationship between the VCSEL driving circuit and the VCSEL is also illustrated in fig. 4.

The driving control unit 41 is configured to control the VCSEL to be turned on or off in a switching driving mode according to the input pulse signal, and output a voltage control signal according to an optical power sensing signal of the VCSEL and a preset operating current setting signal of the VCSEL.

The power supply unit 42 is configured to control a voltage supplied to the VCSEL according to the voltage control signal, so that a current when the VCSEL is turned on is a preset operating current.

In this embodiment, the driving control unit 41 is controlled by the input pulse signal to control the on or off of the VCSEL, the power supply unit 42 provides the variable power supply voltage VDD for the VCSEL, and the magnitude of the power supply voltage VDD of the power supply unit 42 is controlled by the voltage control signal of the driving control unit 41. That is, the driving control unit 41 is implemented by using a circuit of a switching driving mode, and when the power supply voltage VDD supplied to the VCSEL by the power supply unit 42 varies, the on-current Id of the VCSEL varies.

The driving control unit 41 determines the voltage control signal according to an optical power sensing signal of the VCSEL and a preset operating current setting signal of the VCSEL, wherein the optical power sensing signal of the VCSEL can be obtained by the driving control unit 41 by directly or indirectly sensing the optical power of the VCSEL, which is not limited in this application.

The preset working current of the VCSEL is a current value required by the VCSEL to work, the preset working current can be set through an external communication signal of the VCSEL driving circuit, different preset working currents can be set according to different application scenes in practical application, and when the brightness of the VCSEL needs to be adjusted, the preset working current can be changed according to the needed brightness.

When the temperature of the VCSEL changes, the conduction current Id of the VCSEL changes, and correspondingly, the optical power sensing signal of the VCSEL acquired by the driving control unit 41 also changes, and the driving control unit 41 can adjust the output voltage control signal according to the change of the optical power sensing signal of the VCSEL, so that the power supply voltage VDD of the power supply unit 42 changes, and thus the conduction current Id of the VCSEL generates an opposite change that can offset the temperature drift, and finally the conduction current of the VCSEL is ensured to be constant at the preset working current.

For example, assuming that the conduction current Id of the VCSEL increases when the temperature of the VCSEL increases, the driving control unit 41 may adjust the output voltage control signal according to the change of the optical power sensing signal of the VCSEL, so that the supply voltage VDD of the supply unit 42 decreases, thereby decreasing the conduction current Id of the VCSEL to offset the increased portion of the conduction current Id caused by the temperature drift, so that the conduction current Id of the VCSEL is maintained constant.

The VCSEL driving circuit provided in this embodiment controls the voltage supplied to the VCSEL according to the VCSEL optical power sensing signal and the preset operating current setting signal of the VCSEL, so that the turn-on current of the VCSEL can be kept constant. In addition, when the conduction current of the VCSEL needs to be changed, different preset working currents are set through the preset working current setting signal, and the fact that the conduction current of the VCSEL is adjustable can be achieved. Because the conduction current of the VCSEL is adjusted by adjusting the power supply voltage of the VCSEL, namely the VCSEL driving circuit is in a switch driving mode, the Q1 works in a saturation region, driving loss is reduced compared with a constant current driving mode, and the driving efficiency is higher.

The driving control unit 41 and the power supply unit 42 in the VCSEL driving circuit are respectively described in detail with reference to examples.

Fig. 5 is a schematic structural diagram of an embodiment of a driving control unit in the VCSEL driving circuit shown in fig. 4. As shown in fig. 5, the driving control unit 41 includes a driving unit 411, an optical power sensing unit 412, and a control unit 413. For clarity of illustrating the operation principle of the driving control unit 41, fig. 5 also illustrates the connection relationship between the driving control unit 41 and the VCSEL.

A first end of the driving unit 411 is connected with an input pulse signal; a second terminal of the driving unit 411 is a VCSEL driving signal terminal, and for example, as shown in fig. 5, the second terminal of the driving unit 411 is connected to a cathode of the VCSEL; the input end of the optical power sensing unit 412 is connected to a Photodiode (PD), the output end of the optical power sensing unit 412 is connected to the first input end of the control unit 413, and the optical power sensing unit 412 is further connected to the input pulse signal; a second input terminal of the control unit 413 is an input terminal of a preset working current setting signal; the output of the control unit 413 is connected to the power supply unit 42.

The driving unit 411 is used for controlling the turn-on or turn-off of the VCSEL according to the input pulse signal; the optical power sensing unit 412 is used for acquiring an optical power sensing signal Vs of the VCSEL; the control unit 413 is configured to determine the voltage control signal Vc according to the optical power sensing signal Vs and a preset working current setting signal; the power supply unit 42 is used for controlling the magnitude of the voltage VDD supplied to the VCSEL according to the voltage control signal Vc.

In this embodiment, the driving unit 411 is controlled by the input pulse signal to control the on or off of the VCSEL, and the driving unit 411 is in a switch driving mode; the optical power sensing unit 412 directly senses the optical power of the VCSEL through the PD or indirectly senses the optical power of the VCSEL through the on-current of the VCSEL, which is proportional to the optical power thereof. The control unit 413 outputs the voltage control signal Vc through operation processing according to the optical power sensing signal Vs acquired by the optical power sensing unit 412 and the preset working current setting signal, and the control unit 413 may be implemented by using a digital circuit and/or an analog circuit, which is not limited by this embodiment.

Fig. 6 is a schematic structural diagram of another embodiment of a driving control unit in the VCSEL driving circuit shown in fig. 4. As shown in fig. 6, the driving control unit 41 includes a driving unit 411, an optical power sensing unit 412, and a control unit 413. For clarity of illustrating the operation principle of the driving control unit 41, fig. 6 also illustrates the connection relationship between the driving control unit 41 and the VCSEL.

A first end of the driving unit 411 is connected with an input pulse signal; a second terminal of the driving unit 411 is a VCSEL driving signal terminal, and for example, as shown in fig. 5, the second terminal of the driving unit 411 is connected to a cathode of the VCSEL; the input end of the optical power sensing unit 412 is connected to the second end of the driving unit 411, the output end of the optical power sensing unit 412 is connected to the first input end of the control unit 413, and the optical power sensing unit 412 is further connected to the input pulse signal; a second input terminal of the control unit 413 is an input terminal of a preset working current setting signal; the output of the control unit 413 is connected to the power supply unit 42.

In this embodiment, the driving unit 411 is controlled by the input pulse signal to control the on or off of the VCSEL, and the driving unit 411 is in a switch driving mode; the optical power sensing unit 412 indirectly senses the optical power of the VCSEL through its on-current, which is proportional to its optical power. The control unit 413 outputs the voltage control signal Vc through operation processing according to the optical power sensing signal Vs acquired by the optical power sensing unit 412 and the preset working current setting signal, and the control unit 413 may be implemented by using a digital circuit and/or an analog circuit, which is not limited by this embodiment.

In practical applications, the driving unit 411, the optical power sensing unit 412 and the control unit 413 may be implemented by various circuits, and each unit module is further described below with reference to examples.

Fig. 7 is a schematic structural diagram of an embodiment of a driving unit in the driving control unit shown in fig. 5 or 6. As shown in fig. 7, the driving unit 411 includes a switch driving circuit 4111 and a first switching tube Q1.

The input end of the switch driving circuit 4111 is connected with an input pulse signal; an output end of the switch driving circuit 4111 is connected to a first end of a first switch tube Q1; the second terminal of the first switching tube Q1 is a VCSEL driving signal terminal for controlling the turn-on or turn-off of the VCSEL, for example, as shown in fig. 7, the second terminal of the first switching tube Q1 is connected to the cathode of the VCSEL; the third terminal of the first switching tube Q1 is grounded.

The switch driving circuit 4111 is configured to control the VCSEL to be turned on when the first switching transistor Q1 is controlled to be in an on state according to the input pulse signal, or to control the VCSEL to be turned off when the first switching transistor Q1 is controlled to be in an off state according to the input pulse signal.

In this embodiment, the switch driving circuit 4111 is a driving circuit adopting a switch driving mode, in which the switch driving circuit 4111 controls the first switch Q1 to be turned on or off only according to the input pulse signal, and does not need to control the driving voltage of the first switch Q1 to generate a constant current effect. In the switch driving mode, the turn-on current of the VCSEL can be controlled by its supply voltage VDD, thereby reducing driving loss.

Fig. 8 is a schematic structural diagram of an embodiment of an optical power sensing unit in the driving control unit shown in fig. 5. As shown in fig. 8, the input terminal of the optical power sensing unit 412 is connected to the PD, and the optical power sensing unit 412 includes a first operational amplifier unit 4121 and a first timing control unit 4122;

the first operational amplifier unit 4121 is connected to the PD, and an input end of the first timing control unit 4122 is connected to the input pulse signal; the output end of the first timing control unit 4122 is connected to the first operational amplifier unit 4121; the PD is used for detecting the light intensity of the VCSEL; the first timing control unit 4122 is configured to control the first operational amplifier unit 4121 to output the optical power sensing signal Vs according to the light intensity when the VCSEL is turned on.

In this embodiment, direct optical power sensing based on the PD is adopted, and the PD needs to be disposed near the VCSEL to ensure that the PD can receive light emitted from the VCSEL, so that optical power of the VCSEL can be converted into an electrical signal, and then the electrical signal is amplified by the first operational amplifier unit 4121 to output the optical power sensing signal Vs.

Since the VCSEL is in the on/off state, the optical power sensing unit 412 needs to combine the input pulse signal to perform timing control to ensure that the light when the VCSEL is turned on is correctly detected, and therefore, the first timing control unit 4122 is connected to the input pulse signal to control the first operational amplifier unit 4121 to output the optical power sensing signal Vs according to the light intensity when the VCSEL is turned on according to the input pulse signal.

The optical power sensing unit of the embodiment directly senses the optical power through the PD without an additional sensing circuit, so that the optical power sensing unit is not affected by other circuit factors, and the measurement result is accurate.

Fig. 9 is a schematic structural diagram of an embodiment of an optical power sensing unit in the driving control unit shown in fig. 6. As shown in fig. 9, the optical power sensing unit 412 includes a second operational amplifier unit 4123 and a second timing control unit 4124;

the second operational amplifier unit 4123 is connected to the second end of the first switching tube Q1; the input end of the second timing control unit 4124 is connected to the input pulse signal; the output end of the second timing control unit 4124 is connected to the second operational amplifier unit 4123;

the second timing control unit 4124 is configured to control the second operational amplifier unit 4123 to output the optical power sensing signal Vs according to the voltage of the first switching tube Q1 when the VCSEL is turned on.

In this embodiment, the voltage drop of the first transistor Q1 is Id × Rds, so the on-current Id of the first transistor Q1, i.e. the on-current Id of the VCSEL, can be indirectly measured by measuring the voltage drop of the first transistor Q1, thereby indirectly sensing the optical power of the VCSEL. Since the VCSEL is in a high-frequency switching state, the current of the VCSEL is also high-frequency pulse, and in order to accurately measure the current, the VCSEL needs to be controlled by combining an input pulse signal to realize synchronous detection.

Optionally, the second operational amplifier unit 4123 includes an operational amplifier and a capacitor, the second timing control unit 4124 is used to control the switch SW according to the input pulse signal, when Id reaches a stable value after the first transistor Q1 is turned on, the second timing control unit 4124 controls the switch SW to be turned on, and the voltage of the capacitor in the second operational amplifier unit 4123 is Id × Rds; the switch SW is turned off before the first transistor Q1 is turned off, so that the voltage of the capacitor in the second opamp unit 4123 is kept at Id Rds, and the process is repeated for a new sampling until the next pulse comes.

The voltage of the capacitor in the second operational amplifier unit 4123 outputs the optical power sensing signal Vs, Vs = Id × Rds after being buffered by the follower constituted by the operational amplifier.

The optical power sampling unit adopting indirect sensing reduces the circuit cost compared with the optical power sampling unit adopting PD in figure 8.

Fig. 10 is a schematic structural diagram of another embodiment of an optical power sensing unit in the driving control unit shown in fig. 6. As shown in fig. 9, the third terminal of the first switch Q1 is grounded through a first resistor R01; the optical power sensing unit 412 includes a third operational amplifier unit 4125 and a third timing control unit 4126;

the third operational amplifier unit 4125 is connected to the third end of the first switching tube Q1; the input end of the third timing control unit 4126 is connected to the input pulse signal; an output end of the third timing control unit 4126 is connected to the third operational amplifier unit 4125;

the third timing control unit 4126 is configured to control the third operational amplifier unit 4125 to output the optical power sensing signal Vs according to the voltage across the first resistor when the VCSEL is turned on.

In this embodiment, the third terminal of the first switching transistor Q1 is grounded through the first resistor R01, and the voltage drop of the first resistor R01 is Id × R01, so that the conduction current Id of the VCSEL can be indirectly measured by measuring the voltage drop of the first resistor R1, thereby indirectly sensing the optical power of the VCSEL. Similarly, since the VCSEL is in a high-frequency switching state, the current of the VCSEL is also a high-frequency pulse, and in order to accurately measure the current, the VCSEL needs to be controlled by combining an input pulse signal to realize synchronous detection.

Optionally, the third operational amplifier unit 4125 includes an operational amplifier and a capacitor, the third timing control unit 4126 is adopted to control the switch SW according to the input pulse signal, when Id reaches a stable value after the first transistor Q1 is turned on, the second timing control unit 4124 controls the switch SW to be turned on, and the voltage of the capacitor in the second operational amplifier unit 4123 is Id R1; the switch SW is turned off before the first transistor Q1 is turned off, so that the voltage of the capacitor in the second opamp unit 4123 is kept as Id R1, and the process is repeated for a new sampling until the next pulse comes.

The voltage of the capacitor in the second operational amplifier unit 4123 outputs the optical power sensing signal Vs, Vs = Id × R01 after being buffered by the follower constituted by the operational amplifier.

The optical power sampling unit of the embodiment also adopts an indirect sensing mode, so that the circuit cost is reduced. In addition, compared with the two detection sensing schemes in fig. 10, in the scheme in fig. 9, the on-resistance Rds of the first switch Q1 is biased to a large temperature, but it does not need to add an additional resistor, so as to avoid an additional resistive power loss, and save one device, which can reduce the cost. Whereas in the solution of fig. 10, the measurement with the first resistance R1 reduces the influence of the temperature drift.

Fig. 11 is a schematic structural diagram of an embodiment of a control unit in the drive control unit shown in fig. 5 or 6. As shown in fig. 11, the control unit 413 includes: an analog-to-digital conversion unit ADC, an error correction unit 4131, and a digital-to-analog conversion unit DAC.

The analog-to-digital conversion unit is used for converting the optical power sensing signal Vs into a digital sensing signal DVs.

The error correction unit 4131 is configured to determine a digital voltage control signal DVc corresponding to the current pulse signal according to the digital sensing signal DVs, the preset working current setting signal, and a digital voltage control signal MVc corresponding to a pre-stored previous pulse signal.

The digital-to-analog conversion unit is used for converting the digital voltage control signal corresponding to the current pulse signal into a voltage control signal Vc.

In this embodiment, the control unit 413 performs signal operation by sampling and digitizing. The preset operation current, based on which the error correction unit 4131 may determine the target reference voltage value DVset, is set by the external communication signal. Alternatively, in order to compensate for the influence of the temperature variation, the error correction unit 4131 may compensate for a preset operating current set by the external communication signal according to the temperature of the VCSEL, and determine the target reference voltage value DVset according to the compensated preset operating current.

After the ADC digitizes the optical power sensing signal Vs into DVs, the error correction unit 4131 subtracts DVset from DVs to obtain an error value Err = DVset-DVs; and performing error correction according to the error value Err to obtain DVc = MVc + Err, and storing the DVc = MVc + Err, wherein MVc is a DVc value stored after the last error correction. The lock signal is used to lock the stored DVc, keeping it constant. The stored value of DVc is converted to a voltage control signal Vc by the DAC.

After several error correction operations as described above, Err =0 is finally obtained, where DVset = DVs, i.e. the sampled value is equal to the target value, and DVc is kept constant, i.e. the voltage control signal Vc is kept constant.

Fig. 12 is a schematic structural diagram of another embodiment of a control unit in the drive control unit shown in fig. 5 or 6. As shown in fig. 12, the control unit 413 includes: an analog subtractor 4132, an analog adder 4133, and an analog memory 4134.

A first input end of the analog subtractor 4132 is connected to the output end of the optical power sensing unit 412, and a second input end of the analog subtractor 4132 is an input end of a preset working current setting signal; a first input end of the analog adder 4133 is connected to the output end of the analog subtractor 4132 and the output end of the analog memory 4134, a second input end of the analog adder 4133 is grounded, and an output end of the analog adder 4133 is connected to the power supply unit 42; an input terminal of the analog memory 4134 is connected to an output terminal of the analog adder 4133.

The analog subtractor 4132 is configured to determine an error signal according to the preset operating current setting signal and the optical power sensing signal Vs.

The analog memory 4134 is used to output a voltage control signal corresponding to the last pulse signal.

The analog adder 4133 is configured to output the voltage control signal Vc according to the voltage control signal corresponding to the previous pulse signal and the error signal.

The control unit 413 in this embodiment obtains the voltage control signal Vc by digital-analog hybrid operation. Wherein the preset operation current is set by an external communication signal, and the target reference voltage value Vset is determined based on the preset operation current. Optionally, in order to compensate for the influence of the temperature variation, a preset operating current set by the external communication signal may be compensated according to the temperature of the VCSEL, and the target reference voltage value Vset may be determined according to the compensated preset operating current.

As shown in fig. 12, the operational amplifier OP1 and the resistors R1-R4 constitute an analog subtractor 4132, and when R1= R2= R3= R4, the output Err of the operational amplifier OP 1= Vset-Vs. The operational amplifier OP2 and the resistors R5-R8 form an analog adder 4133, and when R5= R6= R7= R8, the output Vc = MVc + Err of the operational amplifier. The operational amplifier OP3, the capacitor C1, and the timing control unit constitute an analog memory 4134, and the timing control unit controls the switch SW0 to be closed, thereby buffering the voltage of the voltage control signal Vc onto the capacitor C1, and storing the voltage with C1.

After several cycles of operation in the digital-analog mixing manner, Err =0 and Vset = Vs, a constant voltage control signal Vc is obtained.

Compared with the scheme in fig. 11, the control unit of the present embodiment adopts the operational amplifier to form the analog subtractor, the analog adder and the analog memory, omits the ADC and the DAC, and has a simpler structure.

Fig. 13 is a schematic structural diagram of an embodiment of a power supply unit in the VCSEL driving circuit shown in fig. 4. As shown in fig. 13, the power supply unit 42 includes: a first feedback amplifier 421, a first regulating tube 422 and a first voltage regulating circuit 423.

The non-inverting terminal of the first feedback amplifier 421 is connected to the output terminal of the driving control unit 41; the inverting terminal of the first feedback amplifier 421 is connected to the first voltage regulating circuit 423; the input end of the first regulating tube 422 is connected with the output end of the first feedback amplifier 421; the output terminal of the first regulating tube 422 is connected to the first voltage regulating circuit 423 and the anode of the VCSEL, respectively.

The first regulating tube 422 is used for regulating the voltage supplied to the VCSEL under the control of the first feedback amplifier 421 and the first voltage regulating circuit 423.

Optionally, as shown in fig. 13, the first voltage regulating circuit 423 includes a second resistor R02 and a third resistor R03. A first end of the second resistor R02 is connected with the reverse end of the feedback amplifier, and a second end of the second resistor R02 is connected with the output end of the regulating tube; a first end of the third resistor R03 is connected with a first end of the second resistor R02, and a second end of the third resistor R03 is grounded; the output terminal of the first regulating tube 422 is grounded through a capacitor.

The power supply unit of this embodiment controls the output voltage VDD by controlling the balance condition of the first feedback amplifier 421, i.e., the voltage balance between the non-inverting terminal and the inverting terminal. The circuit shown in fig. 13 can determine the supply voltage VDD = (R02/R03+1) × Vc that the power supply unit 42 supplies power to the VCSEL, so that the supply voltage VDD can be adjusted by controlling the voltage control signal Vc.

Fig. 14 is a schematic structural diagram of another embodiment of a power supply unit in the VCSEL driving circuit shown in fig. 4. As shown in fig. 14, the power supply unit 42 includes: a second feedback amplifier 424, a second regulating tube 425 and a second voltage regulating circuit 426;

the non-inverting terminal of the second feedback amplifier 424 is connected to the reference voltage signal; the inverting terminal of the second feedback amplifier 424 is connected to a second voltage regulating circuit 426; the second voltage regulating circuit 426 is also connected to the output terminal of the drive control unit 41; an input terminal of the second regulating tube 425 is connected with an output terminal of the second feedback amplifier 424; the output terminal of the second regulating tube 425 is connected to the second voltage regulating circuit 426 and the anode of the VCSEL, respectively;

the first regulating tube is used to regulate the voltage level supplied to the VCSEL under the control of the first feedback amplifier and the second voltage regulating circuit 426.

Optionally, as shown in fig. 14, the second voltage regulating circuit 426 includes a fourth resistor R04, a fifth resistor R05, and a sixth resistor R06; a first end of the fourth resistor R04 is connected to the inverting terminal of the second feedback amplifier 424, a first end of the fifth resistor R05, and a first end of the sixth resistor R06, respectively; the second end of the fourth resistor R04 is connected with the output end of the regulating tube; a second end of the fifth resistor R05 is connected to the output end of the drive control unit 41; a second terminal of the sixth resistor R06 is connected to ground.

The power supply unit of the present embodiment controls the output voltage VDD by controlling the balance condition of the first feedback amplifier 424, i.e., the voltage balance between the non-inverting terminal and the inverting terminal. The circuit shown in fig. 14 can determine the supply voltage VDD = R04/(R05// R04// R06) × Vref-R04/R05 × Vc for the power supply unit 42 to supply power to the VCSEL, so that the adjustment of the supply voltage VDD can be realized by controlling the voltage control signal Vc.

In the above embodiments, the respective unit modules of the VCSEL driving circuit provided in the present application are exemplified. A VCSEL drive circuit configured by combining the unit modules will be described below.

Fig. 15 is a schematic structural diagram of a VCSEL driving circuit according to an embodiment of the present disclosure. As shown in fig. 15, the VCSEL driving circuit includes a driving control unit 41 and a power supply unit 42. The driving control unit 41 includes a driving unit 411, an optical power sensing unit 412, and a control unit 413.

Wherein the driving unit 411 is the driving unit shown in fig. 7, and the optical power sensing unit 412 is the optical power sensing unit shown in fig. 8; the control unit 413 is a control unit as shown in fig. 11. The power supply unit 42 is a power supply unit as shown in fig. 14.

The driving unit 411 adopts a switch driving mode, and controls the on or off of the first switching tube Q1 according to the input pulse signal, so as to control the on or off of the VCSEL. The optical power sensing unit 412 senses the optical power of the VCSEL through the PD and outputs an optical power sensing signal Vs to the control unit 413. The control unit 413 performs an operation based on a preset operating current set by the external communication signal and the optical power sensing signal Vs to obtain a voltage control signal Vc, and outputs the voltage control signal Vc to the power supply unit 42. The power supply unit 42 outputs the supply voltage VDD to the VCSEL according to the voltage control signal Vc, thereby completing closed-loop control of the VCSEL conduction current.

In this embodiment, the power supply unit 42 may be implemented by using a Boost-type switching power supply control chip, and a Boost-topology high-efficiency Boost circuit is formed by using the Boost-type switching power supply control chip and matching with the inductor L1 and the capacitor C2, so that the output voltage VDD is higher than the power supply voltage; the second voltage regulating circuit 426 and the voltage control signal Vc together determine the magnitude of the output voltage VDD.

The driving unit 411, the optical power sensing unit 412 and the control unit 413 included in the driving control unit 41 may be integrated inside a driving control chip, wherein: the driving unit 411 is externally connected with a VCSEL; the optical power sensing unit 412 is externally connected to the PD and is used for sensing the optical power of the VCSEL; the control unit 413 outputs a voltage control signal Vc control voltage to the power supply unit 42, controlling the output voltage VDD of the power supply unit 42. The switch pulse input drive control chip is used for controlling the on-off of the VCSEL, and the external communication signal input drive control chip is used for configuring the preset working current or the light power of the VCSEL.

It should be noted that the implementation scheme taking the two chips, namely the boost switching power supply control chip and the driving control chip, as cores is only an example scheme. In practical applications, the unit modules of the VCSEL driving circuit provided in the embodiment of the present application may be integrated as needed, and the unit modules may be integrated in one or more chips. For example, the driving control unit 41 and the power supply unit 42 may be integrated into a chip, such that, when viewed from the outside of the chip, one port is used for receiving an input pulse signal, one port is used for receiving an external communication signal, one port is used for controlling the VCSEL to be turned on or off, one port is used for connecting the PD to collect optical power, and one port is used for outputting the voltage VDD. The embodiment of the present application does not limit the specific chip integration manner of the VCSEL driving circuit.

Fig. 16 is a schematic structural diagram of another VCSEL driving circuit according to an embodiment of the present disclosure. Compared with the circuit shown in fig. 15, in the VCSEL driving circuit of the present embodiment, the optical power sensing unit 412 obtains the optical power sensing signal in an indirect sensing manner, so that when the VCSEL driving circuit is integrated into a chip, there is no separate optical power sampling port outside the chip.

It is to be understood that fig. 15 and 16 only exemplify VCSEL driving circuits in which the unit modules exemplified in the two foregoing embodiments can be combined, but the structure of the VCSEL driving circuit is not limited thereto. In practical applications, the respective unit modules illustrated in the foregoing embodiments may be combined to constitute VCSEL driving circuits having different internal structures. Moreover, according to the integration requirement of the circuit, the unit modules can be integrated to form the VCSEL drive circuit of integrated chip.

The embodiment of the present application further provides a VCSEL module, which includes the VCSEL driving circuit and the VCSEL in any of the above embodiments; the first end of the VCSEL driving circuit is connected with the anode of the VCSEL and used for supplying power to the VCSEL; and the second end of the VCSEL driving circuit is connected with the cathode of the VCSEL and used for controlling the VCSEL to be switched on or off according to the input pulse signal, and the VCSEL is used for emitting light signals under the control of the VCSEL driving circuit.

The embodiment of the present application further provides a VCSEL driving chip, including the VCSEL driving circuit in any of the above embodiments.

The embodiment of the present application further provides a VCSEL driving method, which is applied to the VCSEL driving circuit in any of the above embodiments, and the method includes:

acquiring an optical power sensing signal of the VCSEL;

and supplying power to the VCSEL according to the optical power sensing signal and a preset working current setting signal of the VCSEL.

The embodiment of the present application further provides an electronic device, which includes an image sensor and the VCSEL module in the above embodiment, wherein an optical signal emitted by the VCSEL module is reflected by a target object, and then a corresponding photoelectric signal is generated by the image sensor, and the photoelectric signal is used to calculate a distance between the target object and the electronic device. The electronic device may be used to determine depth information of the target object, or may be used to acquire a three-dimensional image of the surface of the target object, or the like.

The implementation principle and technical effect of the VCSEL module, the VCSEL driving chip, the VCSEL driving method, and the electronic device in the embodiments of the present application are similar to those of the VCSEL driving circuit in any of the embodiments described above, and are not described herein again.

It will be apparent to those skilled in the art that various changes and modifications may be made in the embodiments of the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the embodiments of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to encompass such modifications and variations.

In the present application, the terms "include" and variations thereof may refer to non-limiting inclusions; the term "or" and variations thereof may mean "and/or". The terms "first," "second," and the like in this application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. In the present application, "a plurality" means two or more. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.

Claims

1. A Vertical Cavity Surface Emitting Laser (VCSEL) driver circuit, comprising: the device comprises a drive control unit and a power supply unit connected with the drive control unit;

the power supply unit is used for controlling the voltage supplied to the VCSEL according to the voltage control signal so as to enable the current when the VCSEL is switched on to be a preset working current;

the driving control unit comprises a driving unit, an optical power sensing unit and a control unit;

the first end of the driving unit is connected with the input pulse signal, and the second end of the driving unit is a VCSEL driving signal end;

the input end of the optical power sensing unit is connected with the photodiode or the second end of the driving unit; the output end of the optical power sensing unit is connected with the first input end of the control unit;

a second input end of the control unit is an input end of the preset working current setting signal; the output end of the control unit is connected with the power supply unit;

2. The VCSEL drive circuit of claim 1, wherein the drive unit comprises a switch drive circuit and a first switching tube;

3. The VCSEL drive circuit of claim 1, wherein an input terminal of the optical power sensing unit is connected to a photodiode, the optical power sensing unit including a first operational amplifier unit and a first timing control unit;

the photodiode is used for detecting the light intensity of the VCSEL;

the first timing control unit is configured to control the first operational amplifier unit to output the optical power sensing signal according to the light intensity when the VCSEL is turned on.

4. The VCSEL drive circuit of claim 2, wherein the optical power sensing unit includes a second operational amplifier unit and a second timing control unit;

the second timing control unit is configured to control the second operational amplifier unit to output the optical power sensing signal according to a voltage on the first switching tube when the VCSEL is turned on.

5. The VCSEL drive circuit of claim 2, wherein a third terminal of the first switching tube is grounded through a first resistor; the optical power sensing unit comprises a third operational amplifier unit and a third time sequence control unit;

6. The VCSEL drive circuit of claim 1, wherein the control unit comprises: the device comprises an analog-to-digital conversion unit, an error correction unit and a digital-to-analog conversion unit;

and the digital-to-analog conversion unit is used for converting the digital voltage control signal corresponding to the current pulse signal into the voltage control signal.

7. The VCSEL drive circuit of claim 1, wherein the control unit comprises: the analog subtractor, the analog adder and the analog memory are connected in series;

a first input end of the analog subtractor is connected with an output end of the optical power sensing unit, and a second input end of the analog subtractor is an input end of the preset working current setting signal; the first input end of the analog adder is connected with the output end of the analog subtractor and the output end of the analog memory respectively, the second input end of the analog adder is grounded, and the output end of the analog adder is connected with the power supply unit; the input end of the analog memory is connected with the output end of the analog adder;

8. A VCSEL drive circuit according to any of claims 1 to 7, wherein the power supply unit includes: the first feedback amplifier, the first regulating tube and the first voltage regulating circuit;

9. The VCSEL drive circuit of claim 8, wherein the first voltage regulating circuit comprises a second resistor and a third resistor;

the first end of the second resistor is connected with the reverse end of the first feedback amplifier, and the second end of the second resistor is connected with the output end of the first regulating tube; the first end of the third resistor is connected with the first end of the second resistor, and the second end of the third resistor is grounded.

10. A VCSEL drive circuit according to any of claims 1 to 7, wherein the power supply unit includes: the second feedback amplifier, the second regulating tube and the second voltage regulating circuit;

the second regulating tube is used for regulating the voltage supplied to the VCSEL under the control of the second feedback amplifier and the second voltage regulating circuit.

11. A VCSEL driver circuit according to claim 10, wherein the second voltage regulating circuit comprises a fourth resistor, a fifth resistor, and a sixth resistor;

a first end of the fourth resistor is connected with an inverting end of the second feedback amplifier, a first end of the fifth resistor and a first end of the sixth resistor respectively; the second end of the fourth resistor is connected with the output end of the second regulating tube; the second end of the fifth resistor is connected with the output end of the driving control unit; and the second end of the sixth resistor is grounded.

12. A VCSEL module of a vertical cavity surface emitting laser is characterized by comprising a VCSEL drive circuit and a VCSEL; the first end of the VCSEL driving circuit is connected with the anode of the VCSEL and used for supplying power to the VCSEL; the second end of the VCSEL drive circuit is connected with the cathode of the VCSEL and used for controlling the VCSEL to be switched on or off according to an input pulse signal, and the VCSEL is used for emitting an optical signal under the control of the VCSEL drive circuit;

the VCSEL driver circuit is the VCSEL driver circuit of any of claims 1-11.

13. A VCSEL driver chip comprising the VCSEL driver circuit according to any of claims 1 to 11.

14. A VCSEL driving method applied to the VCSEL driving circuit of any of claims 1 to 11, the method comprising:

acquiring an optical power sensing signal of the VCSEL;

15. An electronic device comprising an image sensor and the VCSEL module of claim 12, wherein the VCSEL module generates a corresponding optical-electrical signal from the image sensor after the optical signal is reflected by a target object, and the optical-electrical signal is used to calculate a distance between the target object and the electronic device.