CN214754672U - Laser drive circuit, laser radar transmission module and laser radar - Google Patents
Laser drive circuit, laser radar transmission module and laser radar Download PDFInfo
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- CN214754672U CN214754672U CN202023007652.8U CN202023007652U CN214754672U CN 214754672 U CN214754672 U CN 214754672U CN 202023007652 U CN202023007652 U CN 202023007652U CN 214754672 U CN214754672 U CN 214754672U
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Abstract
The utility model discloses a laser drive circuit, laser radar emission module and laser radar, laser drive circuit, including charging branch road and discharge branch road, the branch road that charges with the branch road that discharges is established ties, wherein, the branch road that charges includes a charging circuit; the discharge branch comprises a plurality of discharge loops, and the discharge loops are connected in parallel. The laser driving circuit only adopts one charging circuit to provide high-voltage signals for the plurality of discharging circuits, and avoids the problem of large volume of the laser driving circuit caused by the fact that each path of laser driving circuit needs one charging circuit, so that the laser driving circuit has small volume and simple structure and is easy to manufacture, and the cost for manufacturing the laser driving circuit is effectively reduced.
Description
Technical Field
The utility model relates to a laser technical field, in particular to laser drive circuit, laser radar transmission module and laser radar.
Background
With the development of technology, lidar has gained widespread use, particularly for multiline lidar, which includes: 16-line lidar, 32-line lidar, 64-line lidar, and the like. In practical application, the multi-line laser radar mainly comprises a timing circuit, a mechanical rotation structure, a laser driving circuit, a receiving amplifying circuit, a main control circuit and a motor driving circuit, wherein each line of laser in the multi-line laser radar is realized by one laser driving circuit, and each laser driving circuit needs one charging circuit and one discharging circuit. Taking 32-line lidar as an example, 32 laser driving circuits are needed for 32-line lidar, wherein each laser driving circuit comprises 32 charging and discharging loops, i.e. 32 charging loops are needed for 32-path laser driving. Therefore, the problems that laser driving circuit components in the laser radar are more, the structure is complex, laser driving circuit modules are more, the manufacturing and welding costs are increased, the size is large and the like are caused.
Therefore, how to provide a laser driving circuit with simple structure and small volume is becoming a technical problem to be solved urgently.
SUMMERY OF THE UTILITY MODEL
To the above problem, the utility model provides a laser drive circuit, laser radar transmission module and laser radar for laser drive circuit is small, with low costs and the universality is strong.
In a first aspect, the present invention provides a laser driving circuit, comprising a charging branch and a discharging branch, wherein the charging branch is connected in series with the discharging branch,
the charging branch comprises a charging loop;
the discharge branch comprises a plurality of discharge loops, and the discharge loops are connected in parallel.
Optionally, the charging loop is composed of a power supply, an inductor, a first resistor and a first switching device, wherein,
the positive electrode of the power supply is connected with the first connecting end of the inductor;
the second connection end of the inductor is connected with the drain electrode of the first switching device, and the grid electrode of the first switching device is connected with the first connection end of the first resistor.
Optionally, the charging loop includes a first ground terminal, a high-voltage control pulse signal input terminal, a high-voltage output terminal, and a second ground terminal, wherein,
the first grounding end is connected with the negative electrode of the power supply and is used for grounding the negative electrode of the power supply;
the high-voltage control pulse signal input end is connected with the second connecting end of the first resistor and used for receiving a charging pulse control signal by the first resistor;
one end of the high-voltage output end is connected with the second connecting end of the inductor and the drain electrode of the first switching device respectively and used for outputting a high-voltage signal;
the second ground terminal is connected to the source of the first switching device, and is used for grounding the source of the first switching device.
Optionally, each of the plurality of discharge loops is composed of a diode, a semiconductor laser, a second resistor, a first capacitor, a second switching device and a second capacitor; wherein the content of the first and second substances,
the cathode of the diode is respectively connected with the anode of the semiconductor laser and the first connecting end of the second capacitor;
the negative electrode of the semiconductor laser is connected with the drain electrode of the second switching device;
and the grid of the second switching device is respectively connected with the first connecting end of the first capacitor and the first connecting end of the second resistor.
Optionally, each of the plurality of discharge loops includes a high voltage input terminal, a laser pulse trigger signal input terminal, and a third ground terminal; wherein the content of the first and second substances,
one end of the high-voltage input end is connected with one end of the high-voltage output end, and the other end of the high-voltage input end is connected with the anode of the diode and used for receiving a high-voltage signal by the diode;
the laser pulse trigger signal input end is connected with the second connecting end of the first capacitor and used for receiving a discharge pulse trigger signal by the first capacitor;
and the third grounding end is respectively connected with the second connecting end of the second capacitor, the second connecting end of the second resistor and the source electrode of the second switching device and is used for grounding the second capacitor, the second resistor and the second switching device.
Optionally, the second capacitor is a high-voltage energy storage capacitor.
Optionally, the first switching device and the second switching device are both MOS transistors.
Optionally, the power supply is a dc power supply.
In a second aspect, the present invention provides a laser radar transmitting module, comprising a main control device and the laser driving circuit, wherein the main control device is respectively connected to a high voltage control pulse signal input terminal and a laser pulse trigger signal input terminal of the laser driving circuit,
the main control device is used for generating a charging pulse signal and a discharging pulse trigger signal so as to control the semiconductor laser to emit light.
In a third aspect, the present invention further provides a lidar including the lidar transmitting module, an APD receiving device, and a timing device; wherein the content of the first and second substances,
one end of the laser radar transmitting module is respectively connected with one end of the timing device and one end of the APD receiving device;
and the other end of the timing device is connected with the other end of the APD receiving device.
The utility model discloses an only adopt a charging circuit to do among the laser drive circuit a plurality of discharging circuit provide high voltage signal, avoid because each way laser drive circuit all needs a charging circuit and the laser drive circuit's that leads to bulky problem for the laser circuit is small, and the cost of manufacture is low.
In addition, because one charging loop is connected with a plurality of discharging loops which are connected in parallel mutually in series, one charging loop can simultaneously output high-voltage signals to the plurality of discharging loops, so that the voltage of the second capacitor in each discharging loop is basically consistent, the interference generated by the small difference of the inductance in the charging loop in the prior art is avoided, and the consistency of the pulse laser power output by each discharging loop can be ensured.
Further, each discharge circuit is provided with a second capacitor and a second switching device, which can form a conduction circuit, and generate a pulse current on the conduction circuit, so that the semiconductor laser emits light, thereby generating the pulse laser.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 shows a schematic structural diagram of a laser driving circuit in an embodiment of the present invention;
fig. 2 shows a schematic structural diagram of a charging circuit in an embodiment of the present invention;
fig. 3 shows a schematic structural diagram of a discharge circuit in an embodiment of the present invention;
fig. 4 shows an exemplary structure diagram of a laser driving circuit in an embodiment of the present invention;
fig. 5 shows a schematic structural diagram of a laser radar transmitting module in an embodiment of the present invention;
fig. 6 shows a schematic structural diagram of a laser radar in an embodiment of the present invention.
Description of reference numerals:
1. a charging branch; 2. a discharge branch circuit; 3. a first discharge circuit; 4. a second discharge loop; 5. a third discharge loop; 6. a fourth discharge circuit; 7. a first ground terminal; 8. a high-voltage control pulse signal input end; 9. a second ground terminal; 10. a high voltage output terminal; 11. a power source; 22. an inductance; 33. a first switching device; 21. a high voltage input; 22. a diode; 23. a second capacitor; 24. a semiconductor laser; 25. a second switching device; 26. a laser pulse trigger signal input end; 27. a third ground terminal; 51 a laser driving circuit; 52. an APD receiving device; 53. a timing device; 54. a master control device.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention are clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The embodiment of the utility model provides an in introduce a laser drive circuit, laser drive circuit is including the branch road that charges and the branch road that discharges, charge the branch road with the branch road that discharges is established ties. As shown in fig. 1, the charging branch includes a charging loop; the discharge branch comprises a plurality of discharge loops, and the discharge loops are connected in parallel. Further, the charging loops are respectively connected with the plurality of discharging loops. In the embodiment of the present invention, the plurality of discharging loops may be 4, 16, 32, 64, but not limited thereto, 8, 10, etc. are also suitable for the present invention. When the number of the discharge loops is 4, 16, 32, and 64, the laser driving circuit is respectively suitable for 4-line lidar, 16-line lidar, 32-line lidar, and 64-line lidar. Therefore, only one charging loop is arranged to be connected with the plurality of discharging loops connected in parallel respectively, and the simultaneous driving and generation of the plurality of pulse lasers can be realized. Thereby the utility model discloses a laser drive circuit is small, and the simple easy preparation of structure, and can practice thrift the cost of preparation laser drive circuit, make laser drive circuit's suitability is stronger.
Specifically, as shown in fig. 2, the charging loop is composed of a power supply 11, an inductor 22, a first resistor, and a first switching device 33, and the charging loop includes a first ground terminal 7, a high-voltage control pulse signal input terminal 8, a high-voltage output terminal 10, and a second ground terminal 9. Further, the positive electrode of the power supply 11 is connected to the first connection end of the inductor 22, and the negative electrode of the power supply 11 is grounded through the first ground end 7; the second connection end of the inductor 22 is connected to the drain of the first switching device 33, the gate of the first switching device 33 is connected to the first connection end of the first resistor, and the source of the first switching device is grounded through the second ground terminal 9. And the second connecting end of the first resistor is connected with the high-voltage control pulse signal input end 8 and used for receiving a charging pulse control signal. The second connection terminal of the inductor 22 and the drain of the first switching device 33 are both connected to one end of the high voltage output terminal 10, and are configured to output a high voltage signal to each discharge loop. When equipment needs a laser driving circuit to provide pulse laser, a high-voltage control pulse signal is sent to a charging loop, the charging loop is used for outputting a high-voltage signal to a plurality of discharging loops when receiving the high-voltage control pulse signal, a first switch device is conducted to store electric energy, and the high-voltage signal is provided for a plurality of discharging loops at the later stage.
In a specific embodiment, after the gate of the first switching device 33 receives the high voltage control pulse signal, the first switching device 33 is turned on, a large current is generated in the inductor 22, and after the first switching device 33 is turned off, the high voltage signal is generated at two ends of the inductor 22, and the high voltage output terminal 10 outputs the high voltage signal to each of the high voltage input terminals. Therefore, compared with the traditional laser driving circuit, the laser driving circuit can output high-voltage signals to a plurality of discharging loops by only one charging loop, so that the laser driving circuit works more reliably and efficiently.
In this embodiment, the first switch device may be an MOS (metal oxide semiconductor) transistor, and in an application process, the MOS transistor is turned on when receiving a high-voltage pulse control signal, so that electric energy can be effectively stored, and a plurality of high-voltage signals can be provided to the discharge circuit at the rear stage, so that the laser driving circuit operates more stably and reliably by the first switch device. Further, the MOS tube can be an N-channel MOS tube.
In this embodiment, the power supply is a dc power supply, and the dc power supply provides electric energy for the charging loop.
In this embodiment, as shown in fig. 3, each of the plurality of discharge loops includes a diode 22, a semiconductor laser 24, a second resistor, a first capacitor, a second switching device 25, and a second capacitor 23, and each of the plurality of discharge loops includes a high voltage input terminal 21, a laser pulse trigger signal input terminal 26, and a third ground terminal 27. One end of the high-voltage input end 21 is connected with one end of the high-voltage output end 10, so that a high-voltage signal output by a charging loop can be effectively received; the other end of the high-voltage input end 21 is connected with the anode of the diode, and the cathode of the diode 22 is respectively connected with the anode of the semiconductor laser 24 and the first connection end of the second capacitor 23; the cathode of the semiconductor laser 24 is connected with the drain of the second switching device 25; the gate of the second switching device 25 is connected to the first connection terminal of the first capacitor and the first connection terminal of the second resistor, respectively. The second connection end of the first capacitor is connected to the laser pulse trigger signal input end 26, and is configured to receive a discharge pulse trigger signal. The second connection end of the second capacitor 23, the second connection end of the second resistor, and the source of the second switching device 25 are all grounded through the third ground terminal 27.
In this embodiment, the second capacitor 23 is a high-voltage energy storage capacitor. The high voltage energy storage capacitor receives the high voltage signal, and when the second switch device 25 receives the discharge pulse trigger signal through the first capacitor, the second switch device 25 is switched on, so that the semiconductor laser 24, the second switch device 25 and the high voltage energy storage capacitor form a switching-on loop, the high voltage energy storage capacitor discharges, pulse current is generated on the switching-on loop, and the semiconductor laser 24 emits light to generate pulse laser.
In this embodiment, the second switching devices are MOS transistors, and the MOS transistors may be N-channel MOS transistors.
For example, as shown in fig. 4, the laser driving circuit includes a charging circuit and four discharging circuits for illustration. The laser driving circuit includes: one charging loop and four discharging loops. The four discharge loops are respectively: a first discharge circuit 3, a second discharge circuit 4, a third discharge circuit 5 and a fourth discharge circuit 6. The four discharging loops are connected in parallel to form a parallel circuit, namely a discharging branch 2, and the charging branch 1 is connected with the discharging branch 2 in series. I.e. the high voltage output 10 of the charging circuit is simultaneously connected to the high voltage input 21 of each discharging circuit.
In the working process of the laser exciting circuit, the first discharging circuit 3 is used for generating pulse laser when receiving the high-voltage signal and the pulse laser trigger signal. The second discharge circuit 4 is used for generating pulse laser when receiving the high voltage signal and the pulse laser trigger signal. The third discharging circuit 5 is used for generating pulse laser when receiving the high voltage signal and the laser trigger signal. The fourth discharging circuit 6 is used for generating pulse laser when receiving the high voltage signal and the pulse laser trigger signal, and because one charging circuit outputs the high voltage signal to a plurality of pulse laser discharging circuits at the same time, the problem of high cost of the laser driving circuit caused by the fact that each laser driving circuit needs one charging circuit is avoided. In addition, because a charging loop outputs high-voltage signals to a plurality of discharging loops simultaneously, the voltages of the high-voltage energy storage capacitors are basically consistent, and the problem that the pulse laser powers of all paths are inconsistent due to the large difference of the voltages of the high-voltage energy storage capacitors caused by the small difference of the inductances in the high-voltage generating circuit in the prior art is solved.
The embodiment of the utility model provides an in still introduce a laser radar transmission module, including main control unit and the aforesaid laser drive circuit, main control unit respectively with laser drive circuit's high-voltage control pulse signal input and laser pulse trigger signal input are connected, wherein, main control unit is used for producing charge pulse signal and discharge pulse trigger signal to control semiconductor laser and give off light. Specifically, as shown in fig. 5, the laser driving circuit is mounted on the main control device. And the laser driving circuit is formed into the laser radar transmitting module, so that the size of the laser radar transmitting module is smaller, and the manufacturing cost of the laser radar transmitting module is reduced.
The embodiment of the method also introduces a laser radar which comprises the laser radar transmitting module, an APD (avalanche photo diode) receiving device and a timing device. Specifically, as shown in fig. 6, one end of a laser driving circuit 51 in the laser radar transmitting module is connected to one end of the APD receiving device 52; the other end of the APD receiving device 52 is connected to one end of the timing device 53, and the other end of the timing device 53 is connected to the main control device 54 in the laser radar transmitting module. By adopting the laser radar in the embodiment, distance measurement can be realized, and the volume and the cost of the laser radar can be effectively reduced.
In this embodiment, since one charging loop outputs a high voltage signal to a plurality of discharging loops at the same time, the problem of a large volume of the laser driving circuit due to the fact that each laser driving circuit needs one charging circuit is avoided, and therefore, the technical problem of the large volume of the laser driving circuit in the prior art is solved.
Although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (10)
1. A laser driving circuit, comprising a charging branch and a discharging branch, wherein the charging branch is connected in series with the discharging branch,
the charging branch comprises a charging loop;
the discharging branch comprises a plurality of discharging loops, and the discharging loops are mutually connected in parallel;
the plurality of discharge circuits each include a semiconductor laser.
2. The laser driver circuit of claim 1, wherein the charging loop is comprised of a power supply, an inductor, a first resistor, and a first switching device, wherein,
the positive electrode of the power supply is connected with the first connecting end of the inductor;
the second connection end of the inductor is connected with the drain electrode of the first switching device, and the grid electrode of the first switching device is connected with the first connection end of the first resistor.
3. The laser driving circuit of claim 2, wherein the charging loop comprises a first ground terminal, a high voltage control pulse signal input terminal, a high voltage output terminal, and a second ground terminal, wherein,
the first grounding end is connected with the negative electrode of the power supply and is used for grounding the negative electrode of the power supply;
the high-voltage control pulse signal input end is connected with the second connecting end of the first resistor and used for receiving a charging pulse control signal by the first resistor;
one end of the high-voltage output end is connected with the second connecting end of the inductor and the drain electrode of the first switching device respectively and used for outputting a high-voltage signal;
the second ground terminal is connected to the source of the first switching device, and is used for grounding the source of the first switching device.
4. The laser driving circuit according to claim 3, wherein the plurality of discharge loops further comprises a diode, a second resistor, a first capacitor, a second switching device, and a second capacitor; wherein the content of the first and second substances,
the cathode of the diode is respectively connected with the anode of the semiconductor laser and the first connecting end of the second capacitor;
the negative electrode of the semiconductor laser is connected with the drain electrode of the second switching device;
and the grid of the second switching device is respectively connected with the first connecting end of the first capacitor and the first connecting end of the second resistor.
5. The laser driving circuit according to claim 4, wherein the plurality of discharge loops each include a high voltage input terminal, a laser pulse trigger signal input terminal, and a third ground terminal; wherein the content of the first and second substances,
one end of the high-voltage input end is connected with one end of the high-voltage output end, and the other end of the high-voltage input end is connected with the anode of the diode and used for receiving a high-voltage signal by the diode;
the laser pulse trigger signal input end is connected with the second connecting end of the first capacitor and used for receiving a discharge pulse trigger signal by the first capacitor;
and the third grounding end is respectively connected with the second connecting end of the second capacitor, the second connecting end of the second resistor and the source electrode of the second switching device and is used for grounding the second capacitor, the second resistor and the second switching device.
6. The laser driver circuit of claim 5, wherein the second capacitor is a high voltage energy storage capacitor.
7. The laser driving circuit according to any of claims 4-6, wherein the first switching device and the second switching device are both MOS transistors.
8. The laser driver circuit of claim 7, wherein the power supply is a DC power supply.
9. A lidar transmission module comprising a master control device and the laser driver circuit of any of claims 1-8, wherein the master control device is connected to a high voltage control pulse signal input terminal and a laser pulse trigger signal input terminal of the laser driver circuit, respectively,
the main control device is used for generating a charging pulse signal and a discharging pulse trigger signal so as to control the semiconductor laser to emit light.
10. A lidar comprising the lidar transmit module of claim 9, an APD receiver, and a timing device; wherein the content of the first and second substances,
one end of the laser radar transmitting module is respectively connected with one end of the timing device and one end of the APD receiving device;
and the other end of the timing device is connected with the other end of the APD receiving device.
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| CN202023007652.8U CN214754672U (en) | 2020-12-15 | 2020-12-15 | Laser drive circuit, laser radar transmission module and laser radar |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115343694A (en) * | 2022-10-18 | 2022-11-15 | 深圳市速腾聚创科技有限公司 | Laser emission module and laser radar apparatus |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115343694A (en) * | 2022-10-18 | 2022-11-15 | 深圳市速腾聚创科技有限公司 | Laser emission module and laser radar apparatus |
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