Driving circuit and laser emission module for multi-line laser radar

Abstract

The present application relates to a driving circuit and a laser emission module for a multi-line laser radar. The driving circuit for the multi-line laser radar includes a pulse control unit, a charging switch unit, a charging energy storage unit, a discharging energy storage unit, a discharging switch unit and a laser. The pulse control unit is used to output a pulse control signal. The first end of the charging switch unit is connected to the pulse control unit. The first end of the charging energy storage unit is connected to the second end of the charging switch unit, and the second end of the charging energy storage unit is grounded. The first end of the discharging energy storage unit is connected to the third end of the charging switch unit. The second end of the discharging energy storage unit is grounded. The first end of the laser is connected to the first end of the discharging energy storage unit. The first end of the discharging switch unit is connected to the pulse control unit. The second end of the discharging switch unit is connected to the second end of the laser. The third end of the discharging switch unit is grounded.

Description

Technical Field

[0001] The present application relates to the field of laser radar technology, and in particular to a driving circuit and a laser emission module for a multi-line laser radar. Background Art

[0002] With the development of laser technology, laser scanning technology is increasingly widely used in measurement, transportation, driving assistance, mobile robots and other fields. LiDAR is a radar system that uses laser to detect the position, speed and other characteristic quantities of a target. Its working principle is to first emit a detection laser beam to the target, then compare the signal reflected from the target with the transmitted signal, and after appropriate processing, it can obtain information such as the distance, direction, height, speed, attitude, and even shape of the target.

[0003] In order to improve the resolution of LiDAR, the laser is required to have a very high emission frequency. At the same time, in order to expand the vertical field of view, the number of lasers in a single LiDAR is increasing, and the volume requirements of the laser drive unit are becoming more and more stringent. Therefore, it is necessary to simplify the laser drive circuit and increase the laser's emission frequency. However, the traditional drive circuit takes a long time to charge the laser, which reduces the laser's emission frequency. Summary of the invention

[0004] Based on this, it is necessary to provide a driving circuit and laser emission module for a multi-line laser radar.

[0005] See also Figure 1 The present application provides a driving circuit for a multi-line laser radar. The driving circuit for the multi-line laser radar includes a pulse control unit, a charging switch unit, a charging energy storage unit, a discharging energy storage unit, a discharging switch unit and a laser. The pulse control unit is used to output a pulse control signal. The first end of the charging switch unit is connected to the pulse control unit. The first end of the charging energy storage unit is connected to the second end of the charging switch unit, and the second end of the charging energy storage unit is grounded. The first end of the discharging energy storage unit is connected to the third end of the charging switch unit. The second end of the discharging energy storage unit is grounded. The first end of the laser is connected to the first end of the discharging energy storage unit. The first end of the discharging switch unit is connected to the pulse control unit. The second end of the discharging switch unit is connected to the second end of the laser. The third end of the discharging switch unit is grounded.

[0006] In one embodiment, the driving circuit for the multi-line laser radar further includes a unidirectional conduction unit. The input end of the unidirectional conduction unit is connected to the third end of the charging switch unit. The output end of the unidirectional conduction unit is connected to the first end of the discharge energy storage unit.

[0007] In one embodiment, the driving circuit for the multi-line laser radar further includes a boost circuit unit. The boost circuit unit is connected to the first end of the charging energy storage unit and is used to charge the charging energy storage unit.

[0008] In one embodiment, the charging switch unit includes a first driving chip and a first switch tube. The first end of the first driving chip is connected to the pulse control unit. The first end of the first switch tube is connected to the second end of the first driving chip. The second end of the first switch tube is connected to the first end of the charging energy storage unit. The third end of the first switch tube is respectively connected to the input ends of the plurality of unidirectional conduction units.

[0009] In one embodiment, the discharge switch unit includes a second driver chip and a second switch tube. The first end of the second driver chip is connected to the third end of the first driver chip. The first end of the second switch tube is connected to the second end of the second driver chip. The second end of the second switch tube is connected to the second end of the laser. The third end of the second switch tube is grounded.

[0010] In one embodiment, the charging energy storage unit includes at least one first capacitor. The first end of the first capacitor is connected to the second end of the first switch tube. The second end of the first capacitor is grounded. And the first end of the first capacitor is connected to the boost circuit unit.

[0011] In one embodiment, the discharge energy storage unit includes at least one second capacitor. The first end of the second capacitor is connected to the output end of the unidirectional conduction unit. The second end of the second capacitor is grounded. And the first end of the second capacitor is connected to the first end of the laser.

[0012] In one embodiment, the capacitance value of the charging energy storage unit is more than 10 times the capacitance value of the discharging energy storage unit.

[0013] In one embodiment, the present application provides a laser emission module including a control module and a plurality of laser discharge modules. The control module includes a pulse control unit, a charging switch unit and a charging energy storage unit. Each of the laser discharge modules includes a discharging energy storage unit, a discharging switch unit and a laser. The pulse control unit is used to output a pulse control signal. The first end of the charging switch unit is connected to the pulse control unit. The first end of the charging energy storage unit is connected to the second end of the charging switch unit. The second end of the charging energy storage unit is grounded. The first ends of the plurality of discharging energy storage units are respectively connected to the third end of the charging switch unit. The second ends of the plurality of discharging energy storage units are grounded. The first end of one of the lasers is connected to the first end of one of the discharging energy storage units. The first ends of the plurality of discharging switch units are respectively connected to the pulse control unit. The second end of one of the discharging switch units is connected to the second end of one of the lasers. The third ends of the plurality of discharging switch units are grounded.

[0014] In one embodiment, the control module further includes a boost circuit unit. The boost circuit unit is connected to the first end of the charging energy storage unit for charging the charging energy storage unit. Each of the laser discharge modules further includes a unidirectional conduction unit. The input ends of the plurality of unidirectional conduction units are respectively connected to the third end of the charging switch unit. The output end of one of the unidirectional conduction units is connected to the first end of one of the discharging energy storage units.

[0015] In the above-mentioned driving circuit and laser emission module for multi-line laser radar, the pulse control unit is used to output a pulse control signal. The charging switch unit and the discharging switch unit are used to control the opening or closing of the circuit. At this time, the pulse control unit is respectively connected to the first end of the charging switch unit and the first end of the discharging switch unit, and the opening or closing of the charging switch unit and the discharging switch unit can be respectively controlled by a pulse control signal. Specifically, the pulse control unit can be a programmable logic chip. The pulse control unit can be a single-chip microcomputer. The charging energy storage unit is used to store or release electrical energy. The discharging energy storage unit is also used to store or release electrical energy. At this time, the pulse control unit controls the opening or closing of the charging switch unit and the discharging switch unit respectively by a pulse control signal, so that the charging energy storage unit and the discharging energy storage unit store or release electrical energy. The laser can be a semiconductor laser, etc.

[0016] Based on the driving circuit for the multi-line laser radar, the pulse control unit controls the charging switch unit to close, and the current flows from the charging energy storage unit to the discharging energy storage unit, completing the charging process of the discharging energy storage unit. Then, the pulse control unit controls the discharging switch unit to close, and the current from the discharging energy storage unit passes through the laser and the discharging switch unit in sequence to form a loop, completing the discharging process. At this time, the discharging energy storage unit provides electrical energy to the laser, and the laser emits light.

[0017] Therefore, the charging and discharging circuit in the driving circuit for the multi-line laser radar is divided into two stages. The first stage is that the charging energy storage unit charges the discharging energy storage unit, and the second stage is that the discharging energy storage unit supplies power to the laser, thereby causing the laser to emit light. The pulse control unit controls the closing or opening of the discharging switch unit and the charging switch unit respectively, thereby realizing the charging or discharging of the discharging energy storage unit and the charging energy storage unit, and the control time is at the nanosecond level. Therefore, the driving circuit for the multi-line laser radar can quickly charge the discharging energy storage unit, thereby quickly providing electrical energy to the laser, causing the laser to emit light. At this time, the driving circuit for the multi-line laser radar can greatly reduce the time for charging the discharging energy storage unit, thereby reducing the time for charging the laser, thereby increasing the light emission frequency of the laser. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are 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 creative work.

[0019] Figure 1 It is a structural schematic diagram of a driving circuit for a multi-line laser radar provided in this application.

[0020] Figure 2 It is a structural schematic diagram of the laser emission module provided in this application.

[0021] Figure 3 It is a timing diagram of the pulse control signal provided in this application.

[0022] Description of reference numerals:

[0023] A driving circuit 300 for a multi-line laser radar, a pulse control unit 10, a charging switch unit 20, a charging energy storage unit 30, a discharging energy storage unit 40, a discharging switch unit 50, a laser 60, a unidirectional conduction unit 70, a boost circuit unit 80, a first driving chip 220, a first switch tube 210, a second driving chip 510, a second switch tube 520, a first capacitor 310, a second capacitor 410, a laser emission module 400, a control module 100, and a laser discharge module 200. DETAILED DESCRIPTION

[0024] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0026] It is understood that the terms "first", "second", etc. used in this application may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish a first element from another element. For example, without departing from the scope of this application, a first resistor may be referred to as a second resistor, and similarly, a second resistor may be referred to as a first resistor. Both the first resistor and the second resistor are resistors, but they are not the same resistor.

[0027] It can be understood that the “connection” in the following embodiments should be understood as “electrical connection”, “communication connection”, etc. if the connected circuits, modules, units, etc. have electrical signals or data transmission between each other.

[0028] When used herein, the singular forms "a", "an", and "said / the" may also include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" and the like specify the presence of stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof. At the same time, the term "and / or" used in this specification includes any and all combinations of the relevant listed items.

[0029] See also Figure 1The present application provides a driving circuit 300 for a multi-line laser radar. The driving circuit 300 for a multi-line laser radar includes a pulse control unit 10, a charging switch unit 20, a charging energy storage unit 30, a discharging energy storage unit 40, a discharging switch unit 50, and a laser 60. The pulse control unit 10 is used to output a pulse control signal. The first end of the charging switch unit 20 is connected to the pulse control unit 10. The first end of the charging energy storage unit 30 is connected to the second end of the charging switch unit 20, and the second end of the charging energy storage unit 30 is grounded. The first end of the discharging energy storage unit 40 is connected to the third end of the charging switch unit 20. The second end of the discharging energy storage unit 40 is grounded. The first end of the laser 60 is connected to the first end of the discharging energy storage unit 40. The first end of the discharging switch unit 50 is connected to the pulse control unit 10. The second end of the discharging switch unit 50 is connected to the second end of the laser 60. The third end of the discharging switch unit 50 is grounded.

[0030] In this embodiment, the pulse control unit 10 is used to output a pulse control signal. The charging switch unit 20 and the discharging switch unit 50 are used to control the opening or closing of the circuit. At this time, the pulse control unit 10 is connected to the first end of the charging switch unit 20 and the first end of the discharging switch unit 50, respectively, and the opening or closing of the charging switch unit 20 and the discharging switch unit 50 can be controlled by a pulse control signal. Specifically, the pulse control unit 10 can be a programmable logic chip. The pulse control unit 10 can be a single-chip microcomputer. The charging energy storage unit 30 is used to store or release electrical energy. The discharging energy storage unit 40 is also used to store or release electrical energy. At this time, the pulse control unit 10 controls the opening or closing of the charging switch unit 20 and the discharging switch unit 50 respectively through a pulse control signal, so that the charging energy storage unit 30 and the discharging energy storage unit 40 store or release electrical energy. The laser 60 can be a semiconductor laser, etc.

[0031] Based on the driving circuit 300 for the multi-line laser radar, the pulse control unit 10 controls the charging switch unit 20 to close, and the current flows from the charging energy storage unit 30 into the discharging energy storage unit 40, completing the charging process of the discharging energy storage unit 40. Then, the pulse control unit 10 controls the discharging switch unit 50 to close, and the current passes through the laser 60 and the discharging switch unit 50 from the discharging energy storage unit 40 in sequence to form a loop, completing the discharging process. At this time, the discharging energy storage unit 40 provides electrical energy to the laser 60, and the laser 60 emits light.

[0032] Therefore, the charging and discharging circuit in the driving circuit 300 for the multi-line laser radar is divided into two stages. The first stage is that the charging energy storage unit 30 charges the discharging energy storage unit 40, and the second stage is that the discharging energy storage unit 40 supplies power to the laser 60, thereby making the laser 60 emit light. The pulse control unit 10 controls the closing or opening of the discharging switch unit 50 and the charging switch unit 20 respectively, thereby realizing the charging or discharging of the discharging energy storage unit 40 and the charging energy storage unit 30, and the control time is at the nanosecond level. Therefore, the driving circuit 300 for the multi-line laser radar can quickly charge the discharging energy storage unit 40, and then quickly provide electrical energy to the laser 60, so that the laser 60 emits light. At this time, the driving circuit 300 for the multi-line laser radar can greatly reduce the time for charging the discharging energy storage unit 40, thereby reducing the time for charging the laser 60, thereby increasing the light emission frequency of the laser 60.

[0033] In one embodiment, the pulse control unit 10 controls the charging switch unit 20 to open for a first preset time of 50ns to 120ns to charge the discharging energy storage unit 40. Then, the pulse control unit 10 controls the discharging switch unit 50 to open for a second preset time of 50ns to 120ns, and the laser 60 emits light.

[0034] In one embodiment, the driving circuit 300 for the multi-line laser radar further includes a unidirectional conduction unit 70. The input end of the unidirectional conduction unit 70 is connected to the third end of the charging switch unit 20. The output end of the unidirectional conduction unit 70 is connected to the first end of the discharging energy storage unit 40.

[0035] In this embodiment, the one-way conducting unit 70 is a one-way conducting electronic component that allows current to flow in only one direction. The input end of the one-way conducting unit 70 is connected to the third end of the charging switch unit 20, and the output end of the one-way conducting unit 70 is connected to the first end of the discharging energy storage unit 40, so that the current flows unidirectionally from the charging energy storage unit 30 to the discharging energy storage unit 40, and is blocked in the reverse direction, so that the problem of reverse flow does not occur.

[0036] In one embodiment, the unidirectional conducting unit 70 includes at least one diode 710 . The positive terminal of the diode 710 is connected to the third terminal of the charging switch unit 20 , and the negative terminal of the diode 710 is connected to the first terminal of the discharging energy storage unit 40 .

[0037] In one embodiment, the driving circuit 300 for the multi-line laser radar further includes a boost circuit unit 80. The boost circuit unit 80 is connected to the first end of the charging energy storage unit 30, and is used to charge the charging energy storage unit 30.

[0038] In this embodiment, the boost circuit unit 80 can use a dedicated boost chip that can realize the DC / DC conversion function to boost the voltage, output a constant voltage, and supply power to the charging energy storage unit 30, thereby supplying power to the discharging energy storage unit 40. At this time, the discharging energy storage unit 40 allows multiple charging without discharging without damaging the device, thereby increasing the reliability of the discharge module and the flexibility of the driving method. Therefore, the charging energy storage unit 30 can be continuously charged through the boost circuit unit 80, thereby continuously supplying power to the discharging energy storage unit 40.

[0039] See also Figure 2 In one embodiment, the boost circuit unit 80 uses an integrated DC-DC boost chip of LM5001, and the maximum output voltage can reach 75V. In this embodiment, the output voltage of the boost circuit unit 80 is 60V. Alternatively, the boost circuit unit 80 uses an LT8705 chip. The ground terminal of the boost circuit unit 80 is grounded, the power terminal of the boost circuit unit 80 is connected to VCC, and the output terminal of the boost circuit unit 80 is connected to the first terminal of the charging energy storage unit 30, so that the charging energy storage unit 30 can be charged.

[0040] See also Figure 2 In one embodiment, the charging switch unit 20 includes a first driving chip 220 and a first switch tube 210. The first end of the first driving chip 220 is connected to the pulse control unit 10. The first end of the first switch tube 210 is connected to the second end of the first driving chip 220. The second end of the first switch tube 210 is connected to the first end of the charging energy storage unit 30. The third end of the first switch tube 210 is respectively connected to the input ends of the plurality of unidirectional conduction units 70.

[0041] In this embodiment, the first driver chip 220 may be an NMOS driver chip, such as LTC7001. The first switch tube 210 may be an NMOS tube. Alternatively, the first driver chip 220 may be a PMOS driver chip, and the first switch tube 210 may be a PMOS tube. The pulse control unit 10 outputs a charging signal to the first driver chip 220. After being driven by the first driver chip 220, the first switch tube 210 is driven to close quickly, and the current flows from the charging energy storage unit 30 into the discharging energy storage unit 40, completing the charging process of the discharging energy storage unit 40.

[0042] In one embodiment, the discharge switch unit 50 includes a second driver chip 510 and a second switch tube 520. The first end of the second driver chip 510 is connected to the third end of the first driver chip 220. The first end of the second switch tube 520 is connected to the second end of the second driver chip 510. The second end of the second switch tube 520 is connected to the second end of the laser 60. The third end of the second switch tube 520 is grounded.

[0043] In this embodiment, the second driver chip 510 may be an NMOS driver chip, such as IX4310T. The second switch tube 520 may be an NMOS tube. Alternatively, the second driver chip 510 may be a PMOS driver chip, and the second switch tube 520 may be a PMOS tube. The pulse control unit 10 outputs a discharge signal to the first driver chip 220, and after being driven by the first driver chip 220, a discharge signal (such as discharge signal 1, discharge signal 2, discharge signal 3, discharge signal 4) is formed, and the discharge signal is transmitted to the second driver chip 510, and is converted into a strong drive signal by the second driver chip 510, and the second switch tube 520 is quickly controlled to close, and the current from the charging energy storage unit 30 forms a loop with the second switch tube 520 through the laser 60, completing the discharge process, and the laser 60 emits light.

[0044] In one embodiment, the charging energy storage unit 30 includes at least one first capacitor 310. The first end of the first capacitor 310 is connected to the second end of the first switch tube 210. The second end of the first capacitor 310 is grounded. And the first end of the first capacitor 310 is connected to the boost circuit unit 80.

[0045] In this embodiment, the charging energy storage unit 30 includes at least one of the first capacitors 310, which can be multiple first capacitors 310 connected in series or / and in parallel. Multiple first capacitors 310 can be used to store or release electrical energy. The pulse control unit 10 outputs a charging signal, and after passing through the first driving chip 220 and the first switch tube 210, the first switch tube 210 is quickly closed, and the current flows from the first capacitor 310 into the discharging energy storage unit 40, completing the charging process of the discharging energy storage unit 40.

[0046] In one embodiment, the first capacitor 310 may be a ceramic capacitor with a capacitance of 1 UF.

[0047] In one embodiment, the discharge energy storage unit 40 includes at least one second capacitor 410. A first end of the second capacitor 410 is connected to the output end of the unidirectional conduction unit 70. A second end of the second capacitor 410 is grounded. And a first end of the second capacitor 410 is connected to a first end of the laser 60.

[0048] In this embodiment, the discharge energy storage unit 40 includes at least one second capacitor 410, and may include multiple second capacitors 410 connected in series or / and in parallel. Multiple second capacitors 410 can be used to store or release electrical energy. The pulse control unit 10 outputs a discharge signal, and after passing through the first drive chip 220, the second drive chip 510 and the second switch tube 520, the second switch tube 520 is quickly closed, and the current from the first capacitor 310 forms a loop through the laser 60 and the second switch tube 520 to complete the discharge process, and the laser 60 emits light.

[0049] In one embodiment, the second capacitor 410 is a ceramic capacitor with a capacitance of 1 nf.

[0050] In one embodiment, the capacitance value of the charging energy storage unit 30 is more than 10 times the capacitance value of the discharging energy storage unit 40 .

[0051] In this embodiment, when the first switch tube 210 is quickly closed, the current flows from the charging energy storage unit 30 into the discharging energy storage unit 40, completing the charging process of the discharging energy storage unit 40. At this time, the capacitance value of the charging energy storage unit 30 is greater than the capacitance value of the discharging energy storage unit 40, and the discharging energy storage unit 40 can be continuously charged.

[0052] Therefore, based on the above-mentioned embodiments, the driving circuit 300 for the multi-line laser radar can reduce the charging time of the laser 60 while simplifying the circuit, thereby increasing the light emission frequency of the laser 60.

[0053] See also Figure 2In one embodiment, the present application provides a laser emission module 400 including a control module 100 and a plurality of laser discharge modules 200. The control module 100 includes a pulse control unit 10, a charging switch unit 20 and a charging energy storage unit 30. Each of the laser discharge modules 200 includes a discharge energy storage unit 40, a discharge switch unit 50 and a laser 60. The pulse control unit 10 is used to output a pulse control signal. The first end of the charging switch unit 20 is connected to the pulse control unit 10. The first end of the charging energy storage unit 30 is connected to the second end of the charging switch unit 20. The second end of the charging energy storage unit 30 is grounded. The first ends of the plurality of discharge energy storage units 40 are respectively connected to the third end of the charging switch unit 20. The second ends of the plurality of discharge energy storage units 40 are grounded. The first end of one of the lasers 60 is connected to the first end of one of the discharge energy storage units 40. The first ends of the plurality of discharge switch units 50 are respectively connected to the pulse control unit 10. The second end of one of the discharge switch units 50 is connected to the second end of one of the lasers 60. The third ends of the plurality of discharge switch units 50 are grounded. The control module 100 further includes a boost circuit unit 80. The boost circuit unit 80 is connected to the first end of the charging energy storage unit 30 for charging the charging energy storage unit 30. Each of the laser discharge modules 200 further includes a unidirectional conduction unit 70. The input ends of the plurality of unidirectional conduction units 70 are respectively connected to the third ends of the charging switch unit 20. The output end of one of the unidirectional conduction units 70 is connected to the first end of one of the discharge energy storage units 40.

[0054] In this embodiment, the boost circuit unit 80, the pulse control unit 10, the charging switch unit 20 and the charging energy storage unit 30 form the control module 100 and are placed on the same control module. The unidirectional conduction unit 70, the discharge energy storage unit 40, the laser 60 and the discharge switch unit 50 constitute the laser discharge module 200. There are multiple laser discharge modules 200, which are placed in parallel in one or more columns and connected to the control module 100. The laser discharge module 200 is small in size, which is more advantageous for the tight space requirements of the multi-line laser radar transmission module.

[0055] In a multi-channel laser radar system, multiple laser discharge modules 200 are required. By simplifying the laser discharge module 200, the laser emission module 400 can occupy a smaller space. Multiple laser discharge modules 200 are arranged in parallel and connected to the control module 100. The connection signal can be a high-voltage power supply signal, a ground signal, a discharge switch signal, an IX4310T power supply signal, etc. Among them, the pulse control unit 10, the charging switch unit 20, the charging energy storage unit 30, the discharging energy storage unit 40, the discharge switch unit 50, the laser 60, the boost circuit unit 80 and the unidirectional conduction unit 70 can refer to the various embodiments in the above embodiments.

[0056] See also Figure 3 At time t1, the pulse control unit 10 gives a charging signal with a pulse width of 200ns. After being driven by the LTC7001 chip, the NMOS tube of the charging switch unit 20 is quickly closed, and the current flows from the charging energy storage unit 30 into each of the discharging energy storage units 40, completing the charging process of each of the discharging energy storage units 40.

[0057] The pulse control unit 10 gives a discharge signal with a pulse width of 50ns at moments t2, t3, t4, and t5, with an interval of 1us between moments t2, t3, t4, and t5, respectively, which is converted into a strong drive signal by the NMOS driver chip IX4310T, and quickly controls the discharge NMOS tube of the discharge switch unit 50 to be closed. The current forms a loop from the discharge energy storage unit 40 through the laser 60 and the discharge NMOS tube, completing the discharge process, and the laser 60 emits light.

[0058] In the description of this specification, the description with reference to the terms "some embodiments", "other embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic description of the above terms does not necessarily refer to the same embodiment or example.

[0059] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0060] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A driving circuit for a multi-line laser radar, characterized in that: include: A pulse control unit (10), used for outputting a pulse control signal; A charging switch unit (20), wherein a first end of the charging switch unit (20) is connected to the pulse control unit (10); A charging energy storage unit (30), wherein a first end of the charging energy storage unit (30) is connected to a second end of the charging switch unit (20), and a second end of the charging energy storage unit (30) is grounded; A discharge energy storage unit (40), wherein a first end of the discharge energy storage unit (40) is connected to a third end of the charging switch unit (20), and a second end of the discharge energy storage unit (40) is grounded; the discharge energy storage unit (40) allows multiple charges without discharge without damaging the device; the capacitance value of the charging energy storage unit (30) is greater than the capacitance value of the discharge energy storage unit (40), so as to continuously charge the discharge energy storage unit (40); A laser (60), wherein a first end of the laser (60) is connected to a first end of the discharge energy storage unit (40); A discharge switch unit (50), wherein a first end of the discharge switch unit (50) is connected to the pulse control unit (10), a second end of the discharge switch unit (50) is connected to a second end of the laser (60), and a third end of the discharge switch unit (50) is grounded; The pulse control unit (10) is also used for charging or discharging the discharging energy storage unit (40) and the charging energy storage unit (30), and the control time is at the nanosecond level; the pulse control unit (10) controls the charging switch unit (20) to be closed, so that current flows from the charging energy storage unit (30) into the discharging energy storage unit (40) to charge the discharging energy storage unit (40); the pulse control unit (10) also controls the discharging switch unit (50) to be closed, so that current flows from the discharging energy storage unit (40) through the laser (60) and the discharging switch unit (50) in sequence to form a loop, so that the discharging energy storage unit (40) provides electrical energy for the laser.

2. The driving circuit for a multi-line laser radar according to claim 1, characterized in that: The driving circuit for the multi-line laser radar also includes: A unidirectional conduction unit (70), wherein an input end of the unidirectional conduction unit (70) is connected to the third end of the charging switch unit (20), and an output end of the unidirectional conduction unit (70) is connected to the first end of the discharging energy storage unit (40).

3. The driving circuit for a multi-line laser radar according to claim 2, characterized in that: The driving circuit for the multi-line laser radar also includes: A boost circuit unit (80), the boost circuit unit (80) being connected to the first end of the charging energy storage unit (30) and being used for charging the charging energy storage unit (30).

4. The driving circuit for a multi-line laser radar according to claim 3, characterized in that: The charging switch unit (20) comprises: A first driving chip (220), wherein a first end of the first driving chip (220) is connected to the pulse control unit (10); A first switch tube (210), wherein a first end of the first switch tube (210) is connected to a second end of the first driving chip (220), a second end of the first switch tube (210) is connected to a first end of the charging energy storage unit (30), and a third end of the first switch tube (210) is respectively connected to input ends of a plurality of the unidirectional conducting units (70).

5. The driving circuit for a multi-line laser radar according to claim 4, characterized in that: The discharge switch unit (50) comprises: a second driving chip (510), wherein a first end of the second driving chip (510) is connected to a third end of the first driving chip (220); A second switch tube (520), wherein a first end of the second switch tube (520) is connected to a second end of the second driving chip (510), a second end of the second switch tube (520) is connected to a second end of the laser (60), and a third end of the second switch tube (520) is grounded.

6. The driving circuit for a multi-line laser radar according to claim 5, characterized in that: The charging energy storage unit (30) comprises at least one first capacitor (310); The first end of the first capacitor (310) is connected to the second end of the first switch tube (210), and the second end of the first capacitor (310) is grounded; And the first end of the first capacitor (310) is connected to the boost circuit unit (80).

7. The driving circuit for a multi-line laser radar according to claim 2, characterized in that: The discharge energy storage unit (40) comprises at least one second capacitor (410); A first end of the second capacitor (410) is connected to the output end of the unidirectional conductive unit (70), and a second end of the second capacitor (410) is grounded; And the first end of the second capacitor (410) is connected to the first end of the laser (60).

8. The driving circuit for a multi-line laser radar according to claim 1, characterized in that: The capacitance value of the charging energy storage unit (30) is more than 10 times the capacitance value of the discharging energy storage unit (40).

9. A laser emission module, characterized in that: include: A control module (100), the control module (100) comprising a pulse control unit (10), a charging switch unit (20) and a charging energy storage unit (30); A plurality of laser discharge modules (200), each of the laser discharge modules (200) comprising a discharge energy storage unit (40), a discharge switch unit (50) and a laser (60); The pulse control unit (10) is used to output a pulse control signal; A first end of the charging switch unit (20) is connected to the pulse control unit (10); A first end of the charging energy storage unit (30) is connected to a second end of the charging switch unit (20), and a second end of the charging energy storage unit (30) is grounded; The first ends of the plurality of discharging energy storage units (40) are respectively connected to the third ends of the charging switch unit (20), and the second ends of the plurality of discharging energy storage units (40) are grounded; the discharging energy storage unit (40) allows multiple charging without discharging without damaging the device; the capacitance value of the charging energy storage unit (30) is greater than the capacitance value of the discharging energy storage unit (40), so as to continuously charge the discharging energy storage unit (40); A first end of the laser (60) is connected to a first end of the discharge energy storage unit (40); The first ends of the plurality of discharge switch units (50) are respectively connected to the pulse control unit (10); The second end of one of the discharge switch units (50) is connected to the second end of one of the lasers (60), and the third ends of the plurality of discharge switch units (50) are grounded; The pulse control unit (10) is also used for charging or discharging the discharging energy storage unit (40) and the charging energy storage unit (30), and the control time is at the nanosecond level; the pulse control unit (10) controls the charging switch unit (20) to be closed, so that current flows from the charging energy storage unit (30) into the discharging energy storage unit (40) to charge the discharging energy storage unit (40); the pulse control unit (10) also controls the discharging switch unit (50) to be closed, so that current flows from the discharging energy storage unit (40) through the laser (60) and the discharging switch unit (50) in sequence to form a loop, so that the discharging energy storage unit (40) provides electrical energy for the laser.

10. The laser emission module according to claim 9, characterized in that: The control module (100) further comprises a boost circuit unit (80), wherein the boost circuit unit (80) is connected to a first end of the charging energy storage unit (30) and is used to charge the charging energy storage unit (30); Each of the laser discharge modules (200) further comprises a unidirectional conduction unit (70); The input ends of the plurality of unidirectional conducting units (70) are respectively connected to the third end of the charging switch unit (20); An output end of the one-way conducting unit (70) is connected to a first end of the discharging energy storage unit (40).

Images