Circuit for supplying power to plurality of lasers, integrated circuit, circuit for emitting laser light, lidar and vehicle

Abstract

A circuit for powering a plurality of lasers, an integrated circuit, a circuit for emitting laser light, a lidar, and a vehicle are disclosed. The circuit comprises a first capacitor connected with the anode of a first laser; the second capacitor is connected with the anode of the second laser; the cathode of the first laser is connected with the cathode of the second laser; the first charging circuit is connected between the first power supply end and the first capacitor and is configured to charge the first capacitor in first charging time; the second charging circuit is connected between the second power supply end and the second capacitor and is configured to charge the second capacitor at the second charging time; the switching circuit is connected between the cathodes of the first laser and the second laser and the first signal end and is configured to connect or disconnect the cathodes of the first laser and the second laser and the first signal end; and the current branch is connected between the cathodes of the first laser and the second laser and the second signal end. The laser power supply reliability can be improved, and the laser radar detection performance is improved.

Description

Technical Field

[0001] This disclosure relates to the field of optical detection technology, and more particularly to a circuit for powering multiple lasers, an integrated circuit, a circuit for emitting lasers, a lidar, and a carrier. Background Technology

[0002] Optical detection technology uses light as a medium to detect objects. Lasers, compared to ordinary light sources, possess characteristics such as monochromaticity and good directionality, making them widely used for object detection. For example, LiDAR (Light Detection and Ranging) uses lasers for object detection and has found applications in fields such as autonomous driving, industrial manufacturing, drones, robot recognition, geographic mapping, and environmental monitoring. However, LiDAR applications face the challenge of ensuring the reliability of the laser's power supply. Utility Model Content

[0003] This disclosure provides a circuit, integrated circuit, circuit for emitting lasers, lidar, and carrier for powering multiple lasers, which can improve the reliability of laser power supply.

[0004] In a first aspect, a circuit is provided for powering a plurality of lasers, the circuit comprising: a first capacitor connected to the anode of a first laser; a second capacitor connected to the anode of a second laser, the cathodes of the first laser and the cathodes of the second laser being connected; a first charging circuit connected between a first power supply terminal and the first capacitor, configured to charge the first capacitor during a first charging time; a second charging circuit connected between a second power supply terminal and the second capacitor, configured to charge the second capacitor during a second charging time; a switching circuit connected between the cathodes of the first laser and the second laser and a first signal terminal, configured to turn on or off the connection between the cathodes of the first laser and the second laser and the first signal terminal; and a current branch connected between the cathodes of the first laser and the second laser and the second signal terminal.

[0005] Optionally, the current branch includes a first resistor.

[0006] Optionally, at least one of the first signal terminal or the second signal terminal is grounded.

[0007] Optionally, the first charging circuit includes: a first switch, a first inductor, a first diode, and a second diode; the first inductor is coupled to a first power supply terminal through the first switch, the first inductor and the first diode are connected in series between the first switch and the anode of the first laser, the cathode of the second diode is connected between the first inductor and the first switch, and the anode of the second diode is coupled to a third signal terminal; the second charging circuit includes: a second switch, a second inductor, a third diode, and a fourth diode; the second inductor is coupled to a second power supply terminal through the second switch, the second inductor and the third diode are connected in series between the second switch and the anode of the second laser, the cathode of the fourth diode is connected between the second inductor and the second switch, and the anode of the fourth diode is coupled to a fourth signal terminal.

[0008] Optionally, at least one of the third or fourth signal terminals is grounded.

[0009] Optionally, the anode of the first laser is also coupled to a third power supply terminal; the anode of the second laser is also coupled to a fourth power supply terminal.

[0010] Optionally, it further includes: a first power consumption circuit connected between the first capacitor and the third power supply terminal; and a second power consumption circuit connected between the second capacitor and the fourth power supply terminal.

[0011] Optionally, the first power consumption circuit includes a second resistor; the second power consumption circuit includes a third resistor.

[0012] Optionally, it further includes: a fifth diode connected in series with the first power consumption circuit between the first capacitor and the third power supply terminal; and a sixth diode connected in series with the second power consumption circuit between the second capacitor and the fourth power supply terminal.

[0013] Optionally, the third and fourth power supply terminals are coupled to the first power supply voltage.

[0014] Optionally, the first power supply terminal and the second power supply terminal are coupled to a second power supply voltage.

[0015] In a second aspect, an integrated circuit is provided, comprising: a current branch connected between a first node and a second signal terminal, the first node being configured to connect a first laser and the cathode of the second laser; a first power consumption circuit connected between a third power supply terminal and the second node, the second node being configured to connect an anode of the first laser and a first capacitor; and a second power consumption circuit connected between a fourth power supply terminal and the third node, the third node being configured to connect an anode of the second laser and the second capacitor.

[0016] Optionally, the current branch includes a first resistor.

[0017] Optionally, the first power consumption circuit includes a second resistor, and the second power consumption circuit includes a third resistor.

[0018] Optionally, it further includes: a first diode, which is connected in series with the first power consumption circuit between the third power supply terminal and the second node; and a second diode, which is connected in series with the second power consumption circuit between the fourth power supply terminal and the third node.

[0019] Optionally, it also includes a switching circuit connected between the first node and the second signal terminal.

[0020] Thirdly, a circuit for emitting laser light includes: a plurality of lasers configured to emit laser light; and a circuit as provided in the first aspect configured to supply power to the plurality of lasers.

[0021] Fourthly, a lidar includes: the circuit provided in the third aspect, configured to emit a laser; a laser receiving circuit, configured to receive the echo of the laser and convert the echo into an electrical signal, the electrical signal being used to generate echo data; and a processing circuit, configured to process the echo data.

[0022] Fifthly, a vehicle comprising a lidar as provided in the fourth aspect. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments will be introduced as examples below. The accompanying drawings described below are merely embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort. The accompanying drawings are used to provide a further understanding of this disclosure and constitute a part of the specification. They are used together with the embodiments of this disclosure to explain this disclosure and do not constitute a limitation of this disclosure.

[0024] Figure 1 A structural example diagram of a lidar consistent with some embodiments of this disclosure is shown;

[0025] Figure 2 A schematic diagram of a circuit containing a laser, consistent with some embodiments of this disclosure, is shown.

[0026] Figure 3 A structural example diagram of a circuit for powering multiple lasers, consistent with some embodiments of this disclosure, is shown;

[0027] Figure 4 A structural example diagram of another circuit for powering multiple lasers, consistent with some embodiments of this disclosure, is shown;

[0028] Figure 5 A structural example diagram of another circuit for powering multiple lasers, consistent with some embodiments of this disclosure, is shown;

[0029] Figure 6 A structural example diagram of another circuit for powering multiple lasers, consistent with some embodiments of this disclosure, is shown;

[0030] Figure 7 A structural example diagram of another circuit for powering multiple lasers, consistent with some embodiments of this disclosure, is shown;

[0031] Figure 8 A structural example diagram of another circuit for powering multiple lasers, consistent with some embodiments of this disclosure, is shown;

[0032] Figure 9 A structural example diagram of an integrated circuit consistent with some embodiments of this disclosure is shown;

[0033] Figure 10 A structural example diagram of another integrated circuit consistent with some embodiments of this disclosure is shown;

[0034] Figure 11 A structural example diagram of yet another integrated circuit consistent with some embodiments of this disclosure is shown;

[0035] Figure 12 A structural example diagram of a circuit for emitting a laser, consistent with some embodiments of this disclosure, is shown;

[0036] Figure 13 A structural example diagram of a lidar consistent with some embodiments of this disclosure is shown. Detailed Implementation

[0037] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the specific implementation methods of this disclosure will be described below with reference to the accompanying drawings. The accompanying drawings described below are merely some embodiments of this disclosure. For those skilled in the art, other drawings or embodiments can be obtained based on these drawings or embodiments without creative effort. Adjustments and improvements made without departing from the concept of this disclosure are all within the protection scope of this disclosure.

[0038] To keep the drawings simple, each figure only schematically shows the parts relevant to the embodiment, and they do not represent the actual structure of the product. In addition, for the sake of simplicity and ease of understanding, only some structures or parts are schematically shown, and there may be more or fewer similar structures or parts in reality.

[0039] LiDAR (Light Detection and Ranging) uses laser light as a medium for object detection and has found applications in many fields. For example, LiDAR can be used in autonomous driving, industrial manufacturing, drones, robot recognition, geographic mapping, and environmental monitoring. Autonomous driving, also known as automated driving or assisted driving, includes any level of automated driving (e.g., L1-L5). In applications, LiDAR can be mounted on vehicles to provide them with perception data (e.g., point cloud data), enabling the vehicles to perform one or more functions such as analysis, decision-making, or control. Vehicles can include, but are not limited to, vehicles, manufacturing terminals, ships, aircraft (e.g., flying vehicles or drones), robots (e.g., industrial robots or home robots), or surveying equipment.

[0040] Figure 1 A structural example diagram of a lidar consistent with some embodiments of this disclosure is shown. Please refer to... Figure 1 The lidar 100 includes a laser emitting system 110, a laser receiving system 120, and a control and processing system 130. In some embodiments, the lidar 100 may further include a scanning system 140, such as a mechanical lidar or a semi-solid-state lidar. The scanning system 140 may include a scanner and a driving device. The driving device can drive the scanner to rotate, swing, or vibrate, so that the laser can scan at least one field of view in the vertical or horizontal field of view. For example, the laser is emitted through the scanner, and the movement of the scanner can change the emission path of the laser. Alternatively, the laser echo can be incident on the scanner and guided to the light receiving path. This disclosure does not limit the type of scanner; for example, the scanner may include, but is not limited to, rotating mirrors, oscillating mirrors, galvanometers, or other devices that can direct the laser to different directions in the environment. Furthermore, the scanning system 140 may include a rotating platform, where one or more electrical devices, circuits, or optical elements from the laser emitting system or laser receiving system can be mounted and rotate with the platform to achieve scanning of at least one field of view in the vertical or horizontal field of view.

[0041] The laser emitting system 110 can emit lasers. When the laser encounters an object 10, it is reflected back to the lidar 100; this reflected light is called an echo. The laser receiving system 120 can receive the echo and convert it into an electrical signal. This electrical signal is pre-processed to obtain echo data. The echo data is provided to the control and processing system 130. The control and processing system 130 processes the echo data to obtain sensing data (e.g., point cloud data). The control and processing system 130 can send the sensing data to the vehicle's control platform, which uses the sensing data to perform one or more functions such as analysis, decision-making, or control.

[0042] The laser emitting system 110 may include a laser emitting circuit and emitting optical elements. The laser emitting circuit may include a laser and a driving circuit. The laser emits laser light under the drive of the driving circuit, and the laser light exits through the emitting optical elements. The type of laser includes, but is not limited to, semiconductor lasers, fiber lasers, or other types of lasers. Semiconductor lasers may include, but are not limited to, one or more of vertical cavity surface emitting lasers (VCSELs), edge emitting lasers (EELs), distributed feedback lasers (DFBs), or similar devices.

[0043] The laser receiving system 120 may include receiving optical elements and a laser receiving circuit. The laser receiving circuit may include a detector and a readout circuit. The receiving optical elements can focus the echo reflected from an object onto the photosensitive surface of the detector. The detector uses the photoelectric effect to convert the optical signal into an electrical signal. The readout circuit is used to read out the electrical signal converted by the detector. In some embodiments, the laser receiving circuit may also include a gating circuit. The gating circuit can be used to selectively activate some or all of the detectors. The gated detector is in a state that can respond to the optical signal and can convert the echo into an electrical signal. The detector may be one or more of the following: a PIN photodiode (PINPD), an avalanche photodiode (APD), a single photon avalanche diode (SPAD), a silicon photomultiplier (SiPM), or similar devices.

[0044] The emitting optical element, located along the laser's emission path, can shape the emitted laser light and adjust its exit path. The receiving optical element, located along the laser's receiving path, can collect the echo reflected from the object 10 and converge the echo onto the photosensitive surface of the detector. For example, the emitting optical element includes, but is not limited to, one or more optical elements such as an emitting lens, a reflector, a homogenizer, or a beam splitter (or beam splitter). For example, the receiving optical element includes, but is not limited to, one or more optical elements such as a receiving lens, a reflector, a filter, or a beam splitter. The emitting and receiving optical elements can be independent, partially multiplexed, or fully multiplexed.

[0045] The preprocessing circuit may include one or more of amplification circuits, filtering circuits, or sampling circuits to perform one or more preprocessing operations such as amplification, filtering, or sampling. The preprocessing circuit may be part of or independent of the laser receiving circuit. The amplification circuit may include an amplifier that amplifies the electrical signal converted by the detector. The filtering circuit may include a filter that removes noise or interference. The sampling circuit may include one or more of an analog-to-digital converter (ADC) or a time-to-digital converter (TDC). For example, an ADC can convert an analog electrical signal into a digital signal representing the echo waveform by periodically sampling the detector output signal, thus obtaining echo data. Similarly, a TDC can measure the echo arrival time by sampling the time of the detector output signal, thus obtaining echo data. For instance, the current signal output by the detector can be converted into a voltage signal, which can be compared with a reference voltage to generate an over-threshold signal. The TDC measures the over-threshold time of the received over-threshold signal to achieve time sampling and obtain echo data. The echo data may include data reflecting one or more parameters such as echo time or echo intensity.

[0046] The control and processing system 130 can process the echo data to obtain sensing data. In some embodiments, the control and processing system 130 can also send control signals to the drive circuit to control the drive circuit to drive the laser to emit light. When the lidar 100 includes a scanning system 140, the control and processing system 130 can also control the scanning system 140. In some embodiments, the control and processing system 130 may include one or more processors. The processor includes, but is not limited to, one or more of the following: application-specific integrated circuit (ASIC), hardware circuit implemented by a programmable logic device (PLD), microcontroller unit (MCU), microprocessor unit (MPU), digital signal processor (DSP), or central processing unit (CPU). Hardware circuit implemented by a PLD includes, but is not limited to, field-programmable gate array (FPGA). When the control and processing system 130 includes multiple processors, the types of processors can be the same or different. For example, the control and processing system 130 may include an MCU and an FPGA. Another example is that the control and processing system 130 may include an MCU, an FPGA, and a DSP. For example, the control and processing system 130 may include a CPU and an FPGA. When the control and processing system 130 includes multiple processors, these processors may be configured separately, partially integrated, or fully integrated. In some embodiments, the control and processing system 130 may be implemented as a system-on-chip (SOC) or an ASIC.

[0047] Multiple lasers can be installed within a lidar system, and these lasers can reuse drive circuits to reduce the cost and size of the lidar. However, reusing drive circuits may cause a decrease in laser performance, or even laser malfunction.

[0048] For example, Figure 2 A schematic diagram illustrating the structure of a laser circuit consistent with some embodiments of this disclosure is shown. Please refer to... Figure 2The circuit 200 may include power supply branches 211-21n, lasers LD1-LDn, and a driving circuit 220. Here, n is the number of power supply branches or lasers, and n is a positive integer greater than 1. The driving circuit 220 includes a control circuit 221 and a switching circuit 222. The control circuit 221 can control the switching circuit 222 to turn on or off. For example, the switching circuit 222 may include a semiconductor switching device, which includes a first electrode, a second electrode, and a third electrode. The first electrode is a control terminal, connected to the control circuit 221, and receives control signals from the control circuit 221 to control the on or off state between the second and third electrodes. Types of semiconductor switching devices include, but are not limited to, metal-oxide-semiconductor transistors, triodes, or gallium nitride (GaN) transistors. The power supply branch 21i is connected between the power supply terminal Vs and the anode of the laser LDi, where i ∈ [1, n]. The lasers LD1-LDn are multiplexed using the driving circuit 220. Switching circuit 222 is connected between the cathode connection and the ground terminal of lasers LD1-LDn. Switching circuit 222 can turn the connection between lasers LD1-LDn and the ground terminal on or off.

[0049] An energy storage element (e.g., a capacitor) is provided in the power supply branch 21i. During the power supply of laser LD1, the connection between the energy storage element in power supply branch 211 and the power supply terminal Vs is turned on, and the power supply terminal Vs charges the energy storage element. This energy storage element provides a positive voltage to the anode of laser LD1. During the emission time of laser LD1, control circuit 221 controls switch circuit 222 to close, a positive voltage exists at the anode of laser LD1, the cathode is grounded, and laser LD1 is turned on to emit light. At this time, the anodes of other lasers are not provided with a positive voltage by the power supply branch. Therefore, although the cathodes of other lasers are grounded, they cannot emit light. This achieves the effect of multiplexing the drive circuit for multiple lasers. The power supply and emission process for other lasers is similar to that of laser LD1.

[0050] Continue to refer to Figure 2 When the energy storage element in power supply branch 21i is charged and before switching circuit 222 is turned on, the cathode of laser LDi has a high voltage. This voltage acts on the cathodes of other lasers, effectively applying a reverse voltage to them. Taking laser LD1 as an example, assuming that the anode of laser LD1 has a voltage V1 under the action of power supply branch 211, then the cathode of LD1 has a voltage V1 before switching circuit 222 is turned on. Voltage V1 acts on the cathodes of other lasers (e.g., the cathodes of lasers LD2-LDn), causing a reverse voltage V1 to exist on the cathodes of lasers LD2-LDn. The presence of this reverse voltage affects the performance of other lasers, especially when the laser's withstand voltage capability is low, potentially leading to reverse breakdown of the laser and affecting the reliability of the laser emission system of the laser radar.

[0051] This disclosure provides circuits for powering multiple lasers, integrated circuits, circuits for emitting lasers, lidar, and carriers. The aim is to reduce the impact of drive circuit reuse on laser performance and improve circuit reliability through circuit design, so that lidar using the circuit has more stable detection performance and carriers using the lidar have more reliable sensing performance.

[0052] Figure 3 A structural example diagram of a circuit for powering multiple lasers, consistent with some embodiments of this disclosure, is shown. (Reference) Figure 3 The circuit 300 includes capacitor C1 (which may be referred to as the first capacitor for distinction), capacitor C2 (which may be referred to as the second capacitor for distinction), charging circuit 311 (which may be referred to as the first charging circuit for distinction), and charging circuit 312 (which may be referred to as the second charging circuit for distinction), switching circuit 320, and current branch 330. Capacitor C1 is connected to the anode of laser LD1 (which may be referred to as the first laser for distinction). Capacitor C2 is connected to the anode of laser LD2 (which may be referred to as the second laser for distinction). The cathodes of laser LD1 and laser LD2 are connected. Charging circuit 311 is connected between the first power supply terminal Vs1 and capacitor C1 and is configured to charge capacitor C1 during a first charging time. Charging circuit 312 is connected between the second power supply terminal Vs2 and capacitor C2 and is configured to charge capacitor C2 during a second charging time. Switching circuit 320 is connected between the cathodes of lasers LD1 and LD2 and the first signal terminal S1, and is configured to turn on or off the connection between the cathodes of lasers LD1 and LD2 and the first signal terminal S1. Current branch 330 is connected between the cathodes of lasers LD1 and LD2 and the second signal terminal S2.

[0053] For ease of understanding and description, the circuit 300 described above is an example of powering two lasers, but this disclosure is not limited thereto. Circuit 300 may include two or more charging circuits and capacitors to power two or more lasers.

[0054] The first signal terminal S1 can be coupled to a first signal, which may include, for example, a positive voltage signal, a ground signal, or a negative voltage signal. This disclosure does not limit the magnitude of the first signal, as long as it is smaller than the voltage that the capacitor connected to the laser anode can provide to the laser, sufficient to create a forward bias across the laser terminals to excite the laser to emit light. For example, the magnitude of the positive voltage signal can be determined based on the forward voltage drop of the laser to ensure that the laser meets the emission conditions. In some embodiments, the first signal terminal S1 may include a ground terminal. This simplifies circuit implementation, reduces the number of signal sources required, reduces signal interference, and lowers circuit cost.

[0055] The second signal terminal S2 can be coupled to a second signal, such as a positive voltage signal or a ground signal. This disclosure does not limit the magnitude of the second signal, as long as it is less than the voltage of the laser cathode, allowing current to flow from the laser cathode to the second signal terminal. In some embodiments, the second signal terminal S2 may include a ground terminal. This simplifies circuit implementation, reduces the number of signal sources required, decreases signal interference, and lowers circuit cost.

[0056] The switching circuit 320 can be controlled by the control circuit of the drive circuit. The description of the drive circuit can be found in the description of the above embodiments.

[0057] The first power supply terminal Vs1 and the second power supply terminal Vs2 can be the same or different power supply terminals. For example, in some embodiments, the first power supply terminal Vs1 and the second power supply terminal Vs2 are coupled to the same supply voltage (which can be referred to as the second supply voltage for distinction). When the first power supply terminal Vs1 and the second power supply terminal Vs2 use the same power supply terminal or are coupled to the same supply voltage, the implementation of the circuit can be simplified, the number of power supply terminals required for the circuit can be reduced, interference with the power supply signal can be reduced, and the cost of the circuit can be reduced.

[0058] When circuit 300 supplies power to laser LD1, charging circuit 311 charges capacitor C1, and switching circuit 320 is not turned on. After charging capacitor C1, its energy storage function can be used to provide a positive voltage to laser LD1. The charging time for capacitor C1 can be called the first charging time. The control and processing system of the lidar can control charging circuit 311 to complete charging of capacitor C1 before the emission time of laser LD1, i.e., the emission time of laser LD1 is after the first charging time. When the emission time of laser LD1 arrives, the control circuit of the drive circuit can control switching circuit 320 to turn on, and laser LD1 emits light under the excitation of the positive voltage. Similarly, when supplying power to laser LD2, charging circuit 312 charges capacitor C2, and switching circuit 320 is not turned on. After charging capacitor C2, its energy storage function can be used to provide a positive voltage to laser LD2. The charging time for capacitor C2 can be called the second charging time. The control and processing system of the lidar can control the charging circuit 312 to complete the charging of capacitor C2 before the emission time of laser LD2, that is, the emission time of laser LD2 is after the second charging time. When the emission time of laser LD2 arrives, the control circuit of the drive circuit can control the switching circuit 320 to turn on, and laser LD2 emits light under the excitation of a positive voltage.

[0059] This disclosure does not limit the duration of the first charging time and the second charging time. The first charging time and the second charging time can be the same or different. The capacitance values ​​of capacitor C1 and capacitor C2 can be the same or different. In some embodiments, laser LD1 and laser LD2 can be lasers of the same type, and capacitors C1 and C2 can be capacitors of the same type. This can reduce the complexity of the circuit and improve the emission consistency of the lidar.

[0060] Continue to refer to Figure 3 A current branch 330 is provided between the cathodes of lasers LD1 and LD2 and the second signal terminal S2. The current branch 330 provides a path for current flow during the charging process of capacitor C1 (or C2) in the charging circuit 311 (or 312). The presence of the current branch reduces the voltage at the cathode of laser LD1 (or LD2). This reduces the magnitude of the reverse voltage acting on laser LD2 (or LD1), lowering the likelihood of reverse breakdown of laser LD2 (or LD1). The circuit for powering multiple lasers provided in this disclosure not only enables the reuse of drive circuits during laser power supply but also ensures the performance stability of the lasers, reducing the risk of reverse breakdown.

[0061] In some embodiments, the switching circuit 320 may include a switching device. Similar to the description of the above embodiments, the switching device may include a semiconductor switching device. For example, a semiconductor switching device includes, but is not limited to, one or more of the following devices: an N-type metal-oxide-semiconductor (NMOS) transistor, an NPN transistor, an N-channel GaN transistor, a P-type metal-oxide-semiconductor (PMOS), a PNP transistor, or a P-channel GaN transistor.

[0062] In some embodiments, the second signal terminal may be coupled to a positive voltage signal. The magnitude of this positive voltage signal is denoted as V2. The voltage provided by capacitor C1 (or C2) is denoted as V1, where V1 is greater than V2, and the difference between V1 and V2 causes the current flowing through laser LD1 (or LD2) to be less than or equal to a preset current. This disclosure does not limit the magnitude of the preset current, as long as the preset current is sufficient to prevent laser LD1 (or LD2) from emitting light. For example, the preset current may be in the range of hundreds of microamps, such as 50uA, 100uA, 150uA, or 200uA.

[0063] In some embodiments, a resistor may be included in the current branch 330. This resistor not only makes the current flowing through the laser more stable, but also improves the consistency of light output from different lasers.

[0064] Figure 4 A schematic diagram illustrating the structure of another circuit for powering multiple lasers, consistent with some embodiments of this disclosure, is shown. Please refer to... Figure 4 The circuit 400 includes capacitors C1 and C2, charging circuits 411 and 412, a switching circuit 420, and a current branch 430. The descriptions of capacitors C1 and C2, charging circuits 411 and 412, and the switching circuit 420 are similar. Figure 3 The illustrated embodiment. The current branch 430 includes a resistor R1 (which may be referred to as the first resistor for clarity).

[0065] Resistor R1 provides a current path for laser LD1 (or LD2) during either the first or second charging time. This current creates a voltage drop across resistor R1, thereby reducing the voltage at the cathode of laser LD1 (or LD2). This reduces the reverse voltage acting on the cathode of laser LD2 (or LD1), lowering the likelihood of reverse breakdown in laser LD2 (or LD1). Choosing a resistor R1 with an appropriate value, such that the current in laser LD1 (or LD2) is less than the current required for laser emission, can prevent unintended emission of laser LD1 (or LD2) during either the first or second charging time. For example, during either the first or second charging time, the current flowing through laser LD1 (or LD2) is approximately I ≈ HV / R1, where HV represents the voltage supplied by capacitor C1 (or capacitor C2). If the threshold current for laser LD1 (or LD2) to emit light is Ith, then by selecting a resistor R1 with an appropriate resistance value so that I < Ith, it is possible to avoid unintended emission of laser LD1 (or LD2) during the first charging time or the second charging time.

[0066] This disclosure does not limit the size of resistor R1, as long as the current flowing through laser LD1 (or LD2) is less than or equal to a preset current (e.g., threshold current Ith). The description of the preset current can be referred to the description of the above embodiments.

[0067] Besides reducing the reverse voltage applied to the laser cathode, resistor R1 also provides a discharge path for capacitor C1 (or C2). During the charging intervals of capacitor C1 (or C2), the stored charge is released, ensuring that both charging cycles of the same capacitor have the same starting voltage, or that different capacitors have the same starting voltage. This allows the energy stored in the same capacitor to be the same or close, or the energy stored in different capacitors to be close or the same. Therefore, capacitor C1 (or C2) can provide the same or close forward voltage to their respective lasers, resulting in similar luminous intensities from different lasers and improving the consistency of the lidar's output light.

[0068] In addition, when resistor R1 is used in the current branch, the resistance value of resistor R1 is less affected by temperature and remains almost unchanged under different temperature conditions. This makes the current flowing through the laser more stable during the first charging time or the second charging time, which is beneficial to the stability of the circuit.

[0069] Figure 5 A schematic diagram illustrating the structure of yet another circuit for powering multiple lasers, consistent with some embodiments of this disclosure, is shown. Please refer to... Figure 5The circuit 500 includes capacitors C1 and C2, charging circuits 511 and 512, a switching circuit 520, and a current branch 530. The descriptions of capacitors C1 and C2, charging circuits 511 and 512, switching circuit 520, and current branch 530 are similar to those in the embodiments described above.

[0070] Charging circuit 511 may include switch M1 (referred to as the first switch for distinction). Charging circuit 512 may include switch M2 (referred to as the second switch for distinction). Switch M1 enables conduction control from the first power supply terminal to capacitor C1, and switch M2 enables conduction control from the second power supply terminal to capacitor C2. Charging circuits 511 and 512 may share the same or different power supply terminals Vs. Switches M1 and M2 can activate different charging circuits at different charging times. This simplifies circuit design, reduces the number of power supply terminals, and lowers circuit cost.

[0071] Charging circuit 511 may further include inductor L1 (referred to as the first inductor for distinction). Charging circuit 512 may further include inductor L2 (referred to as the second inductor for distinction). Charging circuit 511 may further include diode D2 (referred to as the second diode for distinction). Charging circuit 512 may further include diode D4 (referred to as the fourth diode for distinction). By setting inductor L1 (or L2) and second diode D2 (or D4), a BOOST boost circuit can be formed with capacitor C1 (or C2), making the voltage of capacitor C1 (or C2) greater than the voltage provided by the power supply terminal Vs. The second diode D2 (or D4) provides a freewheeling path for current in inductor L1 (or L2) during charging. In some embodiments, a switching transistor (e.g., a field-effect transistor or a bipolar transistor) can be used instead of the second diode D2 (or D4) to provide a freewheeling path for current in inductor L1 (or L2).

[0072] Charging circuit 511 may also include diode D1 (which may be referred to as the first diode for distinction). Charging circuit 512 may also include diode D3 (which may be referred to as the third diode for distinction). Diode D1 (or D3) can prevent current from flowing in reverse, avoiding current flowing in reverse to the power supply terminal Vs after the voltage of capacitor C1 (or C2) rises.

[0073] Please continue to refer to this. Figure 5In some embodiments, inductor L1 can be coupled to a first power supply terminal (e.g., power supply terminal Vs) via switch M1. Inductor L1 and diode D1 are connected in series between switch M1 and the anode of laser LD1. The cathode of diode D2 is connected between inductor L1 and switch M1, and the anode of diode D2 is coupled to a third signal terminal S3. Similarly, inductor L2 can be coupled to a second power supply terminal (e.g., power supply terminal Vs2) via switch M2. Inductor L2 and diode D3 are connected in series between switch M2 and the anode of laser LD2. The cathode of diode D4 is connected between inductor L2 and switch M2, and the anode of diode D4 is coupled to a fourth signal terminal S4.

[0074] In the circuit 500 above, during the first charging time, switch circuit 520 is off, switch M1 is on, and the power supply terminal Vs charges capacitor C1 through charging circuit 511. After a period of time, switch M1 is off, and diode D2 provides a freewheeling path for inductor L1 to continue charging capacitor C1 until the current in inductor L1 drops to zero, and the voltage of capacitor C1 reaches its maximum. During the emission time of laser LD1, control switch circuit 520 is on, and capacitor C1 can provide a forward bias voltage to laser LD1, causing laser LD1 to emit light. During the second charging time, switch circuit 520 is off, switch M2 is on, and the power supply terminal Vs charges capacitor C2 through charging circuit 512. After a period of time, switch M2 is off, and diode D4 provides a freewheeling path for inductor L2 to continue charging capacitor C2 until the current in inductor L2 drops to zero, and the voltage of capacitor C2 reaches its maximum. During the emission time of laser LD2, control switch circuit 520 is turned on, and capacitor C2 provides a forward bias voltage to laser LD2, causing laser LD2 to emit light. The charging process of other charging circuits and the emission process of the laser are similar to the above.

[0075] This disclosure does not limit the connection order of inductor L1 and diode D1. For example, one end of inductor L1 can be connected to one end of switch M1, the other end of inductor L1 can be connected to the anode of diode D1, and the cathode of diode D1 can be connected to capacitor C1. Alternatively, the anode of diode D1 can be connected to one end of switch M1, the cathode of diode D1 can be connected to one end of inductor L1, and the other end of inductor L1 can be connected to capacitor C1. Similarly, this disclosure does not limit the connection order of inductor L2 and diode D3. For example, one end of inductor L2 can be connected to one end of switch M2, the other end of inductor L2 can be connected to the anode of diode D3, and the cathode of diode D3 can be connected to capacitor C2. Alternatively, the anode of diode D3 can be connected to one end of switch M2, the cathode of diode D3 can be connected to one end of inductor L2, and the other end of inductor L2 can be connected to capacitor C2. Diode D4 is connected in parallel with inductor L2.

[0076] In some embodiments, at least one of the third signal terminal S3 or the fourth signal terminal S4 is grounded. Similar to the embodiments described above, grounding design simplifies circuit implementation, reduces the number of signal sources required, lowers signal interference, and reduces circuit cost. In some embodiments, at least one of the third signal terminal S3 or the fourth signal terminal S4 is connected to a positive voltage, which is sufficiently small to enable the laser to conduct and emit light. For example, connecting the third signal terminal S3 to a positive voltage can provide a positive voltage to the anode of laser LD1, thereby increasing the reverse voltage that the cathode of laser LD1 can withstand. Similarly, connecting the fourth signal terminal S4 to a positive voltage can provide a positive voltage to the anode of laser LD2, thereby increasing the reverse voltage that the cathode of laser LD2 can withstand. This further reduces the possibility of the laser being reverse-biased.

[0077] Figure 6 A schematic diagram illustrating the structure of yet another circuit for powering multiple lasers, consistent with some embodiments of this disclosure, is shown. Please refer to... Figure 6 The circuit 600 includes capacitors C1 and C2, charging circuits 611 and 612, a switching circuit 620, and a current branch 630. The descriptions of capacitors C1 and C2, charging circuits 611 and 612, switching circuit 620, and current branch 630 are similar to those in the previous embodiment. The anode of laser LD1 is also coupled to a third power supply terminal Vs3, and the anode of laser LD2 is also coupled to a fourth power supply terminal Vs4. The third power supply terminal Vs3 can provide a positive voltage Vb1 to laser LD1, making the voltage (i.e., reverse bias voltage) Vb1 across laser LD1... LD1 =V C2 -ΔV LD2 -Vb1 is used to further reduce the reverse bias voltage of laser LD1, protecting it from breakdown. Where V... C2 The voltage ΔV supplied by capacitor C2 to laser LD2 LD2 This represents the voltage drop across the laser LD2. Similarly, the fourth power supply terminal Vs4 can provide a positive voltage Vb2 to the laser LD2, making the voltage (i.e., the reverse bias voltage) across the laser LD2 Vb2 equal to the voltage drop across the laser LD2. LD2 =V C1 -ΔV LD1 -Vb2 is used to further reduce the reverse bias voltage of laser LD2, protecting it from breakdown. Where V... C1 The voltage ΔV supplied by capacitor C1 to laser LD1 LD1 This represents the voltage drop across the laser LD1.

[0078] Continue to refer to Figure 5 and Figure 6Lasers (such as LD1 or LD2) inherently possess parasitic inductance. Laser emission can cause the voltage of capacitors (such as C1 or C2) to change from positive to negative. The potential of the third power supply terminal Vs3 is higher than that of capacitor C1. Vs3 charges capacitor C1 through diode D2, inductor L1, and diode D1, increasing C1's voltage. This can cause LD1 to emit light unexpectedly, affecting the lidar's detection performance. For example, LD1 might also emit light during LD2's emission time. Similarly, the potential of the fourth power supply terminal Vs4 is also higher than that of capacitor C2. Vs4 charges C2 through diode D4, inductor L2, and diode D3, increasing C2's voltage. This can also cause LD2 to emit light unexpectedly, affecting the lidar's detection performance.

[0079] In some embodiments, a power consumption circuit can be provided between capacitor C1 and the third power supply terminal Vs3, and between capacitor C2 and the fourth power supply terminal Vs4, in order to reduce the generation of unexpected light emission and improve the detection performance of the lidar.

[0080] Figure 7 A schematic diagram illustrating the structure of yet another circuit for powering multiple lasers, consistent with some embodiments of this disclosure, is shown. Please refer to... Figure 7 The circuit 700 includes capacitors C1 and C2, charging circuits 711 and 712, a switching circuit 720, and a current branch 730. The descriptions of capacitors C1 and C2, charging circuits 711 and 712, switching circuit 720, and current branch 730 are similar to those in the above embodiments. The circuit 700 may further include a power consumption circuit 741 (which may be referred to as a first power consumption circuit for distinction) and a power consumption circuit 742 (which may be referred to as a second power consumption circuit for distinction), wherein power consumption circuit 741 is connected between capacitor C1 and a third power supply terminal Vs3, and power consumption circuit 742 is connected between capacitor C2 and a fourth power supply terminal Vs4.

[0081] The power consumption circuit can dissipate the energy supplied to capacitor C1 (or C2) by power supply terminal Vs3 (or Vs4), causing some of the energy supplied by power supply terminal Vs3 (or Vs4) to be wasted in the form of heat in the power consumption circuit. This reduces the voltage reached by capacitor C1 (or C2) after laser LD1 (or LD2) emits light, as it is charged through power supply terminal Vs3 (or Vs4), thus reducing the possibility of laser LD1 (or LD2) emitting light unexpectedly. Taking power consumption circuit 741 as an example, after laser LD1 emits light, assuming the voltage of capacitor C1 changes from HV1 to -HV2. At this time, the potential of the third signal terminal S3 is higher than the potential of capacitor C1, and the third signal terminal S3 can charge capacitor C1 through diode D2, inductor L1, and diode D1. At the same time, the third power supply terminal Vs3 charges capacitor C1 through power consumption circuit 741. During this process, some energy is consumed in the form of heat in power consumption circuit 741. This ensures that the final voltage of capacitor C1 is less than HV2. The anode voltage of laser LD1 can be lowered, reducing the risk of unintended emission from laser LD1 and improving the detection performance of the lidar. Similarly, the power consumption circuit 742 can dissipate the energy on capacitor C2, reducing unintended emission from laser LD2 and improving the detection performance of the lidar.

[0082] This disclosure does not limit the type of devices or circuit structure included in the power consumption circuit. In some embodiments of this disclosure, the power consumption circuit may include resistors, which is simple to implement and low in cost. For example, Figure 8 A schematic diagram illustrating the structure of yet another circuit for powering multiple lasers, consistent with some embodiments of this disclosure, is shown. Please refer to... Figure 8 The circuit 800 includes capacitors C1 and C2, charging circuits 811 and 812, a switching circuit 820, and a current branch 830. The descriptions of capacitors C1 and C2, charging circuits 811 and 812, switching circuit 820, and current branch 830 are similar to those in the embodiments described above. The first power consumption circuit may include resistor R2 (which may be referred to as the second resistor for distinction). The second power consumption circuit may include resistor R3 (which may be referred to as the third resistor for distinction). This disclosure does not limit the resistance value of resistor R2 (or resistor R3), as long as the energy consumed by this resistance is sufficient to make the voltage provided by capacitor C1 (or capacitor C2) less than the turn-on voltage of laser LD1 (or laser LD2).

[0083] In some embodiments of this disclosure, please refer to [the relevant documentation]. Figure 8The circuit 800 may further include diode D5 (which may be referred to as the fifth diode for distinction) and diode D6 (which may be referred to as the sixth diode for distinction). Diode D5 is connected in series with the first power consumption circuit (e.g., resistor R2) between capacitor C1 and the third power supply terminal Vs3. Diode D6 is connected in series with the second power consumption circuit (e.g., resistor R3) between capacitor C2 and the fourth power supply terminal Vs4. Diode D5 or diode D6 can prevent capacitor C1 (or C2) from charging the third power supply terminal Vs3 or the fourth power supply terminal Vs4 after capacitor C1 (or C2) has finished charging, thereby avoiding interference with the light emission of laser LD1 (or LD2) and preventing damage to the third power supply terminal Vs3 or the fourth power supply terminal Vs4.

[0084] This disclosure does not limit the connection location of the diodes and power-consuming circuits. For example, diode D5 and the first power-consuming circuit (e.g., resistor R2) can be connected between the cathode of laser LD1 and the third signal terminal Vs3. Alternatively, diode D5 and the first power-consuming circuit (e.g., resistor R2) can be connected between the anode of diode D1 and the third signal terminal Vs3. Similarly, diode D6 and the second power-consuming circuit (e.g., resistor R3) can be connected between the cathode of laser LD2 and the fourth signal terminal Vs4; or, diode D6 and the second power-consuming circuit (e.g., resistor R3) can be connected between the anode of diode D3 and the fourth signal terminal Vs4.

[0085] Furthermore, this disclosure does not limit the connection order of the diodes and power-consuming circuits. For example, the cathode of diode D5 is connected to the anode of laser LD1. The anode of diode D5 is connected to the third power supply terminal Vs3 through resistor R2. As another example, resistor R2 is connected to the anode of laser LD1. The cathode of diode D5 is connected to resistor R2, and the anode of diode D5 is connected to the third power supply terminal Vs3. Similarly, the cathode of diode D6 is connected to the anode of laser LD2, and the anode of diode D6 is connected to the fourth power supply terminal Vs4 through resistor R3. Alternatively, resistor R3 is connected to the anode of laser LD2, the cathode of diode D6 is connected to resistor R3, and the anode of diode D6 is connected to the fourth power supply terminal Vs4.

[0086] In some embodiments, the third power supply terminal Vs3 and the fourth power supply terminal Vs4 can be coupled to the same power supply voltage (which can be referred to as the first power supply voltage for clarity). This simplifies circuit design, reduces the number of power supply signals, and allows for a basically consistent power supply design for different lasers using a simple circuit design, thereby improving the consistency of laser output.

[0087] above Figures 5-8The switch shown is merely an example, and this disclosure does not limit the type of semiconductor switching device used. Furthermore, in any of the above embodiments, the other end of capacitor C1 or capacitor C2 can be grounded to simplify circuit design. In other embodiments, the other end of capacitor C1 or capacitor C2 can also be coupled to a positive or negative voltage signal, and this disclosure is not limiting.

[0088] This disclosure also provides an integrated circuit. For example, Figure 9 A structural example diagram of an integrated circuit consistent with some embodiments of this disclosure is shown. The integrated circuit 900 may include a current branch 910, a power consumption circuit 920, and a power consumption circuit 930. The current branch 910 is connected between a first node J11 and a signal terminal J12. The first node J11 may be connected to the cathodes of lasers LD1 and LD2. The power consumption circuit 920 is connected between a power supply terminal J22 and a second node J21, whereby the second node J21 may be connected to the anode of laser LD1 and capacitor C1. The power consumption circuit 930 is connected between a power supply terminal J32 and a third node J31, whereby the third node J32 may be connected to the anode of laser LD2 and capacitor C2.

[0089] Signal terminal J12 may include, for example, the second signal terminal S2 in the above embodiments; power supply terminal J22 may include, for example, the third power supply terminal Vs3 in the above embodiments; and power supply terminal J32 may include, for example, the fourth power supply terminal Vs4 in the above embodiments.

[0090] In some embodiments, the current branch 910 may include a resistor R1.

[0091] In some embodiments, the power consumption circuit 920 may include resistor R2, and the power consumption circuit 920 may include resistor R3.

[0092] Figure 10 An example diagram of another integrated circuit structure consistent with some embodiments of this disclosure is shown. In some embodiments, the integrated circuit 1000 further includes diodes D5 and D6. Diode D5 is connected in series with resistor R2 between power supply terminal J22 and second node J21; diode D6 is connected in series with resistor R3 between power supply terminal J32 and third node J31.

[0093] Figure 11 A structural example diagram of another integrated circuit consistent with some embodiments of this disclosure is shown. In some embodiments, the integrated circuit 1100 further includes a switching circuit 1110; the switching circuit 1110 is connected between the first node J11 and the signal terminal J4. The switching circuit 1110 can turn on or off the connection between the first node J11 and the signal terminal J4. The signal terminal J4 may, for example, include the first signal terminal S1 in the above embodiments.

[0094] This disclosure also provides a circuit for emitting laser light. For example, Figure 12 A schematic diagram of a circuit for emitting lasers, consistent with some embodiments of this disclosure, is shown. The circuit 1200 includes a plurality of lasers LD1-LDN and a circuit 1210, where N is the number of lasers and is a positive integer greater than 1. Lasers LD1-LDN can emit lasers; circuit 1210 can supply power to lasers LD1-LDN.

[0095] This disclosure also provides a lidar system. For example, Figure 13 A structural example diagram of a lidar consistent with some embodiments of this disclosure is shown. Please refer to... Figure 13 The lidar 1300 includes: a circuit 1310 for emitting laser light, a laser receiving circuit 1320, and a processing circuit 1330, as provided in the above embodiments. The circuit 1310 can emit laser light. The laser receiving circuit 1320 can receive the laser echo and convert the echo into an electrical signal, which is used to generate echo data. The processing circuit 1330 can process the echo data.

[0096] In this disclosure, unless otherwise expressly specified and limited, ordinal numbers, such as "first," "second," etc., are used only to distinguish and describe related objects, and should not be construed as indicating or implying the relative importance or order between related objects. Furthermore, ordinal numbers do not represent the quantity of related objects. For example, "first lidar" may include one lidar or multiple lidars.

[0097] "Multiple" includes two or more, and other classifiers are similar.

[0098] The terms "or" and "and / or" in this disclosure are used to describe relationships between related objects, indicating a non-exclusive inclusion. For example, "A and / or B" and "A or B" can both include: "A alone," "B alone," or "A and B," where "A" and "B" can include a single object or multiple objects. Similarly, "A, B and / or C," "A, B or C," and "A, B and C" can both include: "A alone," "B alone," "C alone," "A and B," "A and C," "B and C," or "A, B and C," where "A," "B," and "C" can include a single object or multiple objects. Additionally, the " / " in this disclosure is used to indicate an "or" relationship between related objects. The meanings of "at least one of A or B" and "one or more of A and B" in this disclosure are the same as the meaning of "A or B" above. The meanings of "one or more of A, B, and C" and "at least one of A, B, or C" are the same as the meaning of "A, B, or C" above. The meaning of "one or more of A, B, and C" is the same as the meaning of "A, B, or C" above.

[0099] In the above embodiments, the descriptions of each embodiment have their own emphasis. Parts not described in detail or in a particular embodiment can be referred to in the relevant descriptions of other embodiments. Furthermore, the above embodiments can be freely combined as needed.

Claims

1. A circuit for powering a plurality of lasers, the circuit comprising: The first capacitor is connected to the anode of the first laser; The second capacitor is connected to the anode of the second laser, and the cathodes of the first laser and the second laser are connected. A first charging circuit is connected between a first power supply terminal and the first capacitor and is configured to charge the first capacitor during a first charging time. The second charging circuit is connected between the second power supply terminal and the second capacitor and is configured to charge the second capacitor during the second charging time. A switching circuit, connected between the cathodes of the first laser and the second laser and the first signal terminal, is configured to turn on or off the connection between the cathodes of the first laser and the second laser and the first signal terminal; The current branch is connected between the cathodes of the first laser and the second laser and the second signal terminal.

2. The circuit according to claim 1, characterized in that, The current branch includes a first resistor.

3. The circuit according to claim 1, characterized in that, At least one of the first signal terminal or the second signal terminal is grounded.

4. The circuit according to any one of claims 1-3, characterized in that, The first charging circuit includes: a first switch, a first inductor, a first diode, and a second diode; the first inductor is coupled to the first power supply terminal through the first switch, the first inductor and the first diode are connected in series between the first switch and the anode of the first laser, the cathode of the second diode is connected between the first inductor and the first switch, and the anode of the second diode is coupled to a third signal terminal; The second charging circuit includes: a second switch, a second inductor, a third diode, and a fourth diode; the second inductor is coupled to the second power supply terminal through the second switch, the second inductor and the third diode are connected in series between the second switch and the anode of the second laser, the cathode of the fourth diode is connected between the second inductor and the second switch, and the anode of the fourth diode is coupled to the fourth signal terminal.

5. The circuit according to claim 4, characterized in that, At least one of the third signal terminal or the fourth signal terminal is grounded.

6. The circuit according to claim 1, characterized in that, The anode of the first laser is also coupled to a third power supply terminal; the anode of the second laser is also coupled to a fourth power supply terminal.

7. The circuit according to claim 6, characterized in that, Also includes: A first power consumption circuit is connected between the first capacitor and the third power supply terminal; The second power consumption circuit is connected between the second capacitor and the fourth power supply terminal.

8. The circuit according to claim 7, characterized in that, The first power consumption circuit includes a second resistor; the second power consumption circuit includes a third resistor.

9. The circuit according to claim 7 or 8, characterized in that, Also includes: The fifth diode is connected in series with the first power consumption circuit between the first capacitor and the third power supply terminal; The sixth diode is connected in series with the second power consumption circuit between the second capacitor and the fourth power supply terminal.

10. The circuit according to claim 6, characterized in that, The third power supply terminal and the fourth power supply terminal are coupled to the first power supply voltage.

11. The circuit according to claim 1, characterized in that, The first power supply terminal and the second power supply terminal are coupled to the second power supply voltage.

12. An integrated circuit for powering a plurality of lasers, the integrated circuit comprising: The first capacitor is connected to the anode of the first laser; The second capacitor is connected to the anode of the second laser, and the cathodes of the first laser and the second laser are connected. A first charging circuit is connected between a first power supply terminal and the first capacitor and is configured to charge the first capacitor during a first charging time. The second charging circuit is connected between the second power supply terminal and the second capacitor and is configured to charge the second capacitor during the second charging time. A current branch is connected between a first node and a second signal terminal, wherein the first node is configured to connect the cathodes of the first laser and the second laser; A first power consumption circuit is connected between a third power supply terminal and a second node, wherein the second node is configured to connect the anode of the first laser and the first capacitor. A second power consumption circuit is connected between a fourth power supply terminal and a third node, wherein the third node is configured to connect the anode of the second laser and the second capacitor.

13. The integrated circuit according to claim 12, characterized in that, The current branch includes a first resistor.

14. The integrated circuit according to claim 12 or 13, characterized in that, The first power consumption circuit includes a second resistor, and the second power consumption circuit includes a third resistor.

15. The integrated circuit according to claim 12, characterized in that, Also includes: The first diode is connected in series with the first power consumption circuit between the third power supply terminal and the second node; The second diode is connected in series with the second power consumption circuit between the fourth power supply terminal and the third node.

16. The integrated circuit according to claim 12, characterized in that, Also includes: A switching circuit is connected between the first node and the second signal terminal.

17. A circuit for emitting laser light, comprising: Multiple lasers are configured to emit lasers; The circuit as described in any one of claims 1-11 or the integrated circuit as described in any one of claims 12-16 is configured to supply power to the plurality of lasers.

18. A lidar, comprising: The circuit as described in claim 17 is configured to emit a laser; A laser receiving circuit is configured to receive the echo of the laser and convert the echo into an electrical signal, the electrical signal being used to generate echo data; The processing circuit is configured to process the echo data.

19. A vehicle, characterized in that, Including the lidar as described in claim 18.

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