Laser emission circuit and laser radar

Abstract

The utility model brings forward a laser emission circuit and a laser radar, the laser emission circuit comprises a driving circuit, a channel switching circuit and a light emitting circuit, the light emitting circuit comprises a plurality of light emitting units, each light emitting unit comprises a switch circuit and a laser, when the laser emission circuit works, different selection signals are output, and the light emitting units are switched on and switched off. A switch control signal output by the driving circuit is output to the switch circuit of the corresponding light-emitting unit from different output ends in the channel switching circuit according to a time sequence, so that the laser of the corresponding light-emitting unit is driven to emit laser pulses according to a preset time sequence, and a driving circuit and a channel switching circuit are arranged in the laser emitting circuit; therefore, the driving control of a plurality of light-emitting units can be realized, the circuit structures of the laser emission circuit and the laser radar are simplified, and the design cost is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of laser radars, and in particular relates to a laser emission circuit and a laser radar. Background Art

[0002] One of the core components of lidar is semiconductor laser. The driving circuit switches high voltage through switching devices to drive the laser to emit light.

[0003] Conventional driving circuits drive lasers by providing a driving unit for each laser. They have a complex structure, occupy a lot of space, and are relatively expensive, which is not conducive to the miniaturization and scalability of laser emission circuits and lidars. Utility Model Content

[0004] The utility model aims to provide a laser emission circuit, aiming to solve the problems of complex structure and high cost of traditional driving circuits.

[0005] A first aspect of an embodiment of the utility model provides a laser emission circuit, comprising:

[0006] The driving circuit is configured to output a switch control signal;

[0007] A channel switching circuit, the channel switching circuit comprising an input terminal, a plurality of output terminals and a control terminal, the input terminal of the channel switching circuit being connected to the output terminal of the driving circuit, the channel switching circuit being configured to be triggered by a selection signal received by the control terminal to sequentially select its own input terminal and a corresponding output terminal, and select and output the switch control signal;

[0008] The light-emitting circuit includes a plurality of light-emitting units, each of which includes a switch circuit and a laser connected in series between a power supply terminal and a ground, and the switch circuit is configured to be triggered to conduct when turned on by the switch control signal so that each of the lasers is powered on and emits laser pulses according to a preset timing.

[0009] Optionally, the laser is a VCSEL laser light source.

[0010] Optionally, the switch circuit includes an electronic switch tube;

[0011] The first end of the laser is connected to the power supply end, the second end of the laser is connected to the ground through the electronic switch tube, and the control end of the electronic switch tube constitutes the control end of the switch circuit.

[0012] Optionally, the electronic switch tube is an NMOS tube, and the drain, gate and source of the NMOS tube respectively constitute the first end, control end and second end of the switch circuit.

[0013] Optionally, the channel switching circuit includes at least one analog switch, the input end of at least one analog switch is respectively connected to the driving circuit, the multiple output ends of each analog switch are respectively connected to one of the switching circuits, each analog switch includes multiple switching channels, the first ends of the multiple switching channels are connected in common to form the input end of the analog switch, and the second end of each switch channel constitutes an output end of the analog switch.

[0014] Optionally, the laser emission circuit further includes:

[0015] A plurality of pull-down circuits are provided, each of the pull-down circuits is connected to an output terminal of the channel switching circuit, and the pull-down circuits are configured to perform potential pull-down.

[0016] Optionally, the pull-down circuit includes a pull-down resistor;

[0017] A first end of the pull-down resistor is connected to an output end of the channel switching circuit, and a second end of the pull-down resistor is grounded.

[0018] Optionally, the driving circuit includes at least one driving chip, and an output end of each of the driving chips is connected to input ends of a plurality of the analog switches.

[0019] Optionally, the driving chip also includes a feedback end, and the driving circuit also includes a feedback resistor, the feedback resistor is connected to the output end and the feedback end of the driving chip, and the driving chip is also configured to be triggered by the voltage signal fed back by the feedback resistor to adjust the voltage size of the switch control signal.

[0020] A second aspect of an embodiment of the utility model proposes a laser radar, comprising a laser receiving circuit and the laser transmitting circuit as described above.

[0021] Compared with the prior art, the embodiments of the utility model have the following beneficial effects: the above-mentioned laser emitting circuit includes a driving circuit, a channel switching circuit and a light-emitting circuit, the light-emitting circuit includes a plurality of light-emitting units, each light-emitting unit includes a switching circuit and a laser, and when the laser emitting circuit is working, by outputting different selection signals, the switch control signal output by the driving circuit is output from different output ends in the channel switching circuit to the switching circuit of the corresponding light-emitting unit according to a timing sequence, thereby driving the laser of the corresponding light-emitting unit to emit laser pulses according to a preset timing sequence. By setting a driving circuit and a channel switching circuit in the laser emitting circuit, the drive control of multiple light-emitting units can be realized, the circuit structure of the laser emitting circuit and the laser radar is simplified, and the design cost is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0023] Figure 1 A schematic diagram of the first structure of a laser emission circuit provided in an embodiment of the utility model;

[0024] Figure 2 A second structural schematic diagram of a laser emission circuit provided in an embodiment of the utility model;

[0025] Figure 3 A third structural schematic diagram of a laser emission circuit provided in an embodiment of the utility model;

[0026] Figure 4 A circuit diagram of a laser emission circuit provided by an embodiment of the utility model;

[0027] Figure 5 A schematic diagram of the structure of a laser radar provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0028] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0029] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0030] like Figure 1 and Figure 2 As shown, the first aspect of the embodiment of the utility model proposes a laser emitting circuit 100, which is arranged opposite to a laser receiving circuit 200 for photoelectric conversion. The laser emitting circuit 100 is provided with a plurality of lasers 311, and the plurality of lasers 311 are used to emit laser pulses at corresponding angles according to corresponding timing.

[0031] The laser receiving circuit 200 is used to receive the laser pulse emitted by the laser emitting circuit 100 and perform photoelectric detection and conversion into an echo signal.

[0032] In order to simplify the structure of the laser emitting circuit 100 and the laser radar and reduce the design cost, in this embodiment, the laser emitting circuit 100 includes:

[0033] The driving circuit 10 is configured to output a switch control signal;

[0034] The channel switching circuit 20 includes an input terminal IN, a plurality of output terminals OUT1 to OUTn and a control terminal. The input terminal of the channel switching circuit 20 is connected to the output terminal of the driving circuit 10. The channel switching circuit 20 is configured to be triggered by a selection signal received by the control terminal to sequentially select its own input terminal and a corresponding output terminal, and select and output the switch control signal;

[0035] The light-emitting circuit 30 includes a plurality of light-emitting units 31. Each light-emitting unit 31 includes a switch circuit 312 and a laser 311 connected in series between a power supply terminal HV and ground. The switch circuit 312 is configured to be triggered to conduct when turned on by a switch control signal so that each laser 311 is powered on and emits laser pulses according to a preset timing.

[0036] In this embodiment, the switch circuit 312 and the laser 311 of each light-emitting unit 31 are connected in series and connected in series between the power supply terminal HV and the ground, wherein one end of the switch circuit 312 or one end of the laser 311 is connected to the power supply terminal HV, for example Figure 1 As shown, the power supply terminal HV, the laser 311, and the switch circuit 312 are connected in sequence, or as Figure 2 As shown, the power supply terminal HV, the switch circuit 312 and the laser 311 are connected in sequence.

[0037] The switch circuit 312 is triggered to turn on when receiving a switch control signal, and a path is formed between the power supply terminal HV, the laser 311 and the switch circuit 312, and the laser 311 electrically emits laser pulses. When the switch control signal is not received, the switch circuit 312 is triggered to turn off, and the path between the power supply terminal HV and the laser 311 is cut off, and the laser 311 does not emit laser pulses.

[0038] When the laser emitting circuit 100 is working, the driving circuit 10 outputs a switch control signal as a signal source, and the channel switching circuit 20 receives one or more different selection signals. Different selection signals select different output ends and input ends of the channel switching circuit 20, so that the switch control signal is correspondingly selected and output from different output ends of the channel switching circuit 20 to a corresponding light-emitting unit 31. After the light-emitting unit 31 receives the switch control signal, the laser 311 electrically emits laser pulses. By outputting different selection signals, the laser 311 of each light-emitting unit 31 emits laser pulses in sequence according to a preset timing.

[0039] Among them, the selection signal can be an address signal, and the control end of the channel switching circuit 20 includes multiple address signal ends. The channel switching circuit 20 selects different output ends and input ends according to the combination of multiple address signals, thereby selecting the switch control signal to be sent to the light-emitting unit 31 at a preset position according to the address signal, and drives the laser 311 at the preset position to emit laser pulses.

[0040] By setting up a channel switching circuit 20 and a driving circuit 10, the sequential selection and output of the switch control signal can be realized. Multiple light-emitting units 31 only need to be configured with one driving circuit 10 and a channel switching circuit 20 to complete sequential light-emitting control, which simplifies the structure of the laser emitting circuit 100 and the laser radar, reduces the design cost, occupies less space, and is conducive to the miniaturization and scalability of the laser emitting circuit 100 and the laser radar.

[0041] The laser 311 may be a corresponding type of laser 311. In an optional embodiment, the laser 311 is a VCSEL laser light source, such as Figure 4 As shown, the plurality of VCSEL laser light sources may include a first VCSEL laser light source D1 , a second VCSEL laser light source D2 , a third VCSEL laser light source D3 , a fourth VCSEL laser light source D4 , and the like.

[0042] Meanwhile, the switch circuit 312 may be a switch tube, a relay, etc. with controlled on / off. In an optional embodiment, as shown in FIG. Figure 4 As shown, the switch circuit 312 includes electronic switch tubes, such as a first electronic switch tube Q1, a second electronic switch tube Q2, a third electronic switch tube Q3, a fourth electronic switch tube Q4, etc.

[0043] A first end of the laser 311 is connected to the power supply end HV, a second end of the laser 311 is connected to the ground through an electronic switch tube, and a control end of the electronic switch tube constitutes a control end of the switch circuit 312 .

[0044] The electronic switch tube is triggered to turn on when receiving a switch control signal, and is triggered to turn off when not receiving a switch control signal. When the electronic switch tube is turned on, the laser 311 is powered on to emit laser pulses, and when it is turned off, the laser 311 is not powered on to stop emitting laser pulses.

[0045] Among them, the electronic switch tube can be a triode, a MOS tube, etc. In an optional embodiment, the switch control signal is a high level, corresponding to the type of the switch control signal. At the same time, in order to achieve high-frequency switching, reduce switching losses, and improve luminous efficiency, in an optional embodiment, the electronic switch tube is an NMOS tube, and the drain, gate and source of the NMOS tube respectively constitute the first end, control end and second end of the switch circuit 312.

[0046] The NMOS tube is triggered to turn on when it receives a high-level switch control signal, and is triggered to turn off when it does not receive a high-level switch control signal. When the NMOS tube is turned on, the laser 311 is powered on to emit laser pulses, and when it is turned off, the laser 311 is not powered on to stop emitting laser pulses.

[0047] The channel switching circuit 20 may adopt a plurality of switches in parallel or an analog switch U1 including a plurality of switch channels. In order to simplify the circuit structure, in an optional embodiment, as shown in FIG. Figure 4 As shown, the channel switching circuit 20 includes at least one analog switch U1, the input end of at least one analog switch U1 is respectively connected to the driving circuit 10, and the multiple output ends of each analog switch U1 are respectively connected to a switching circuit 312. Each analog switch U1 includes multiple switch channels, and the first ends of the multiple switch channels are connected in common to form an input end of the analog switch U1, and the second end of each switch channel constitutes an output end of the analog switch U1.

[0048] In the present embodiment, each analog switch U1 includes a plurality of output terminals, and several of the plurality of output terminals of each analog switch U1 are respectively connected to the control terminal of the switch control circuit of a light emitting unit 31, wherein the number of analog switches U1 is set correspondingly according to the number of light emitting units 31 and the number of output terminals of the analog switch U1. For example, each analog switch U1 includes 8 output terminals. When the number of light emitting units 31 is 24, 3 analog switches U1 need to be set. Alternatively, when the number of output terminals of each analog switch U1 is 8 and the number of light emitting units 31 is 20, the 8 output terminals of two of the analog switches U1 can be selected to be connected to 16 light emitting units 31, and the 4 output terminals of another light emitting unit 31 can be connected to 4 light emitting units 31. The output terminals of the three analog switches U1 can also be connected to 20 light emitting units 31 in a manner of 6, 7, 7 or 6, 6, 8. The number and connection method of the analog switches U1 are specifically set according to the number of light emitting units 31, and are not specifically limited here.

[0049] The analog switch U1 also includes a control end. The analog switch U1 selects the internal switch channel according to the selection signal received by the control end, thereby connecting the input end and the corresponding output end, and selects and outputs the received switch control signal to the corresponding light-emitting unit 31. After the light-emitting unit 31 receives the switch control signal, the laser 311 is powered on to emit laser pulses. By outputting different selection signals, the laser 311 of each light-emitting unit 31 emits laser pulses in sequence according to a preset timing.

[0050] Among them, the selection signal can be an address signal, and the control end of the analog switch U1 includes multiple address signal ends, such as address signal ends A0, A1, and A2. The analog switch U1 selects different output ends and input ends according to the combination of multiple address signals. For example, assuming that the analog switch U1 includes 8 output ends and three address signal ends A0, A1, and A2, when A0, A1, and A2 are respectively 000, the analog switch U1 selects the input end and the first output end, when A0, A1, and A2 are respectively 001, the analog switch U1 selects the input end and the second output end, and when A0, A1, and A2 are respectively 111, the analog switch U1 selects the input end and the eighth output end. Each output end is connected to a different light-emitting unit 31, so that the switch control signal is sent to the light-emitting unit 31 at a preset position according to the address signal selection, and the laser 311 at the preset position is driven to emit a laser pulse.

[0051] The analog switch U1 further includes an enable terminal, such as a first enable terminal EN1 and a second enable terminal EN2 . The analog switch U1 is triggered to work or stop working according to an enable signal received by the enable terminal.

[0052] The enable signal and the selection signal can be output by a corresponding control circuit, which can be a separate control unit used only to control the analog switch U1, or the control circuit can be a control module of the laser radar, which is also used to receive the echo signal through the laser receiving circuit 200, and determine the flight time of the echo signal, as well as the distance information and reflectivity according to the echo pulse width and pulse arrival time of the echo signal. The sources of the enable signal and the selection signal are not limited.

[0053] In order to prevent the laser 311 from being mistakenly excited by the transient voltage, in an optional embodiment, as Figure 3 As shown, the laser emission circuit 100 further includes:

[0054] A plurality of pull-down circuits 40 are provided, each of which is connected to an output terminal of the channel switching circuit 20 , and the pull-down circuit 40 is configured to perform potential pull-down.

[0055] In this embodiment, at the working moment of the laser emitting circuit 100, the output end of the channel switching circuit 20 is pulled down by the pull-down circuit 40, thereby lowering the transient voltage output by the channel switching circuit 20, preventing the laser 311 from being mistakenly excited or damaged by high voltage, and improving the working reliability of the laser 311.

[0056] The pull-down circuit 40 may use a corresponding pull-down resistor or a bias circuit. In an optional embodiment, Figure 4As shown, in order to simplify the circuit structure and reduce the design cost, the pull-down circuit 40 includes pull-down resistors, such as a first pull-down resistor R1, a second pull-down resistor R2, a third pull-down resistor R3, a fourth pull-down resistor R4, etc.

[0057] A first end of the pull-down resistor is connected to an output end of the channel switching circuit 20 , and a second end of the pull-down resistor is grounded.

[0058] In this embodiment, the pull-down resistor is connected between the output end of the channel switching circuit 20 and the ground. At the working moment of the laser emitting circuit 100, the pull-down resistor pulls down the potential of the output end of the channel switching circuit 20, thereby lowering the transient voltage output by the channel switching circuit 20, preventing the laser 311 from being mistakenly excited or damaged by high voltage, and improving the working reliability of the laser 311.

[0059] The driving circuit 10 may adopt corresponding signal source circuits, signal amplification circuits, power conversion circuits, etc. In an optional embodiment, as Figure 4 As shown, the driving circuit 10 includes at least one driving chip U2 , and the output end of each driving chip U2 is connected to the input ends of a plurality of analog switches U1 .

[0060] In this embodiment, the driver chip U2 includes a positive power supply terminal VCC, a signal input terminal and a signal output terminal. The positive power supply terminal VCC is used to output the working power to the driver chip U2. The driver chip U2 amplifies or converts the signal received at the signal input terminal, and outputs a switch control signal from the signal output terminal. The driver chip U2 can be a corresponding type of driver chip U2 according to the signal conversion method, such as an amplifier chip, a voltage conversion chip, etc.

[0061] One or more driver chips U2 can be selected. When there is one, the output end of the driver chip U2 is connected to the input end of one or more analog switches U1, and the switch control signal is output to the analog switch U1 to switch the output from the analog switch U1 to the corresponding light-emitting unit 31.

[0062] When multiple driver chips U2 are included, the input ends of the multiple driver chips U2 are connected in common and receive the same signal. At the same time, the output ends of each driver chip U2 are respectively connected to a number of analog switches U1, and respectively output switch control signals. At the same time, according to the requirements of the turn-on voltage of different electronic switch tubes, the voltage of the switch control signal output by each driver chip U2 may be equal or unequal, which is specifically set according to the requirements of the electronic switch tube at the back end.

[0063] At the same time, in order to ensure that the voltage of the switch control signal output by each driver chip U2 remains constant, in an optional embodiment, as Figure 4As shown, the driving chip U2 also includes a feedback terminal FB, and the driving circuit 10 also includes feedback resistors, such as a first feedback resistor R5, a second feedback resistor R6, etc. The feedback resistors are connected to the output terminal and the feedback terminal FB of the driving chip U2. The driving chip U2 is also configured to be triggered by the voltage signal fed back by the feedback resistor to adjust the voltage size of the switch control signal.

[0064] The feedback resistor serves to limit waveform oscillation and ensure stable operation of the driver chip U2. By feeding back the voltage of the output switch control signal to the feedback end, the driver chip U2 implements constant voltage regulation to prevent waveform oscillation of the switch control signal. At the same time, it ensures that the back-end switch circuit 312 receives a stable switch control signal to achieve normal on-off control and excitation control of the laser 311.

[0065] Compared with the prior art, the embodiments of the utility model have the following beneficial effects: the above-mentioned laser emitting circuit 100 includes a driving circuit 10, a channel switching circuit 20 and a light-emitting circuit 30, the light-emitting circuit 30 includes a plurality of light-emitting units 31, each light-emitting unit 31 includes a switching circuit 312 and a laser 311, when the laser emitting circuit 100 is working, by outputting different selection signals, the switch control signal output by the driving circuit 10 is output from different output ends in the channel switching circuit 20 to the switching circuit 312 of the corresponding light-emitting unit 31 according to the timing, thereby driving the laser 311 of the corresponding light-emitting unit 31 to emit laser pulses according to the preset timing, and the laser emitting circuit 100 is provided with one driving circuit 10 and one channel switching circuit 20, so as to realize the drive control of multiple light-emitting units 31, simplify the circuit structure of the laser emitting circuit 100 and the laser radar, and reduce the design cost.

[0066] The utility model also proposes a laser radar, such as Figure 5 As shown, the laser radar includes a laser receiving circuit 200 and a laser transmitting circuit 100. The specific structure of the laser transmitting circuit 100 refers to the above embodiment. Since the laser radar adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0067] In this embodiment, the laser emitting circuit 100 is correspondingly arranged to the laser receiving circuit 200. The laser emitting circuit 100 includes a corresponding light-emitting circuit 30, a channel switching circuit 20 and a driving circuit 10. Each laser 311 in the light-emitting circuit 30 is used to receive power and emit laser pulses. The channel switching circuit 20 is used to control the selection and output a switch control signal to the corresponding light-emitting unit 31 to control the laser 311 in each light-emitting unit 31 to emit laser pulses at a corresponding angle according to a corresponding timing.

[0068] The laser receiving circuit 200 is used to receive the laser pulse emitted by the laser transmitting circuit 100, and perform detection and conversion into a pulse echo signal. The laser receiving circuit 200 can select corresponding photodetectors and signal processing circuits. The photodetector is used to realize the photoelectric conversion of laser pulses to echo signals. At the same time, the signal processing circuit is used to realize signal isolation, amplification, detection and other processing. According to the signal processing method, the isolation circuit, amplification circuit, detection circuit, etc. can be selected accordingly.

[0069] The laser radar may also include a control module, which is used to output a selection signal to the laser emitting circuit 100, drive the laser emitting circuit 100 to emit laser pulses, and simultaneously receive an echo signal output by the laser receiving circuit 200, and determine the flight time of the echo signal, as well as the distance information and reflectivity according to the echo pulse width and pulse arrival time of the echo signal.

[0070] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention.

Claims

1. A laser emission circuit, characterized in that: include: The driving circuit is configured to output a switch control signal; A channel switching circuit, the channel switching circuit comprising an input terminal, a plurality of output terminals and a control terminal, the input terminal of the channel switching circuit being connected to the output terminal of the driving circuit, the channel switching circuit being configured to be triggered by a selection signal received by the control terminal to sequentially select its own input terminal and a corresponding output terminal, and select and output the switch control signal; A light-emitting circuit, wherein the light-emitting circuit includes a plurality of light-emitting units, each light-emitting unit includes a switch circuit and a laser connected in series between a power supply terminal and a ground, an input terminal of each switch circuit is connected to an output terminal of the channel switching circuit, and the switch circuit is configured to be triggered to turn on by the switch control signal so that each of the lasers is powered on and emits laser pulses according to a preset timing.

2. The laser emitting circuit according to claim 1, characterized in that: The laser is a VCSEL laser light source.

3. The laser emitting circuit according to claim 1, characterized in that: The switch circuit includes an electronic switch tube; The first end of the laser is connected to the power supply end, the second end of the laser is connected to the ground through the electronic switch tube, and the control end of the electronic switch tube constitutes the control end of the switch circuit.

4. The laser emitting circuit according to claim 3, characterized in that: The electronic switch tube is an NMOS tube, and the drain, gate and source of the NMOS tube respectively constitute the first end, control end and second end of the switch circuit.

5. The laser emitting circuit according to claim 1, characterized in that: The channel switching circuit includes at least one analog switch, the input end of at least one analog switch is respectively connected to the driving circuit, and the multiple output ends of each analog switch are respectively connected to one of the switching circuits. Each analog switch includes multiple switch channels, and the first ends of the multiple switch channels are connected in common to form the input end of the analog switch, and the second end of each switch channel constitutes an output end of the analog switch.

6. The laser emitting circuit according to claim 5, characterized in that: The laser emission circuit also includes: A plurality of pull-down circuits are provided, each of the pull-down circuits is connected to an output terminal of the channel switching circuit, and the pull-down circuits are configured to perform potential pull-down.

7. The laser emitting circuit according to claim 6, characterized in that: The pull-down circuit includes a pull-down resistor; A first end of the pull-down resistor is connected to an output end of the channel switching circuit, and a second end of the pull-down resistor is grounded.

8. The laser emitting circuit according to claim 5, characterized in that: The driving circuit includes at least one driving chip, and the output end of each driving chip is connected to the input ends of a plurality of the analog switches.

9. The laser emitting circuit according to claim 8, characterized in that: The driving chip also includes a feedback end, and the driving circuit also includes a feedback resistor, which is connected to the output end and the feedback end of the driving chip. The driving chip is also configured to be triggered by the voltage signal fed back by the feedback resistor to adjust the voltage of the switch control signal.

10. A laser radar, characterized in that: The invention comprises a laser receiving circuit and a laser emitting circuit as claimed in any one of claims 1 to 9.

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