CN216414181U

CN216414181U - Semiconductor laser driving source for laser radar

Info

Publication number: CN216414181U
Application number: CN202122708233.5U
Authority: CN
Inventors: 杨立杰; 俞玉春; 赵晓明
Original assignee: Suzhou Etron Technologies Co ltd
Current assignee: Suzhou Etron Technologies Co ltd
Priority date: 2021-11-08
Filing date: 2021-11-08
Publication date: 2022-04-29
Anticipated expiration: 2031-11-08

Abstract

The utility model discloses a semiconductor laser driving source for a laser radar, which comprises a processor S1, a half-bridge driving module S2 and a synchronous BUCK module which are sequentially connected, wherein the output end of the synchronous BUCK module is connected with a laser tube S7 for driving a semiconductor laser; the output end of the synchronous BUCK module is also respectively connected with and transmits the sampled peak current and the sampled output current to the processor S1 through the peak current sampling module S3 and the output current sampling module S4. The semiconductor laser driving source for the laser radar adopts a working mode of synchronous rectification current feedback, and adopts a synchronous BUCK module switching mode, so that the power consumption can be greatly reduced, multiple working modes such as constant current and pulse are realized, the requirements of small volume, high efficiency, quick response and the like are met, the structure is simple, the installation and the maintenance are easy, and the popularization is facilitated.

Description

Semiconductor laser driving source for laser radar

Technical Field

The utility model relates to the field of radar laser power supplies, in particular to a semiconductor laser driving source for a laser radar.

Background

Lidar is a type of radar that operates in the optical frequency band. The method utilizes electromagnetic waves of optical frequency wave bands to transmit detection signals to a target, and then compares received co-wave signals with transmitted signals to obtain the position of the target. For the whole system of the laser radar, the transmitting optical system is the most important part, and the types of the laser include a solid laser and a semiconductor laser, and with the continuous improvement of the output power, the semiconductor laser is the mainstream direction of the future development because of the advantages of wide tuning range, small size and the like.

The laser radar has four basic requirements on a laser light source, namely, the laser radar has higher power, and most of the laser radar needs to work in a pulse mode, so that the corresponding requirements are that the pulse energy is high and the pulse repetition frequency is high; the laser beam quality is good, and especially the divergence angle of the laser beam is required to be small, and the directivity is required to be good; generally, a laser is required to have small volume, low power consumption, stable and reliable performance and the like so as to meet the requirements of various carrying modes of laser radars. The laser driving source matched with the laser driving device is also required to be small in size, low in power consumption, high in response speed and stable in performance. The prior art is generally implemented by using a linear voltage reduction and resistance current limiting manner. Not only the power consumption is high, efficient, and the electric current is not suitable for the regulation simultaneously.

SUMMERY OF THE UTILITY MODEL

The utility model aims to: in order to solve the problems, the utility model provides a semiconductor laser driving source for a laser radar, which adopts a BUCK constant current control technology to realize various working modes such as constant current, pulse and the like and meets the requirements of small volume, high efficiency, quick response and the like.

The technical scheme of the utility model is as follows:

a semiconductor laser driving source for a laser radar comprises a processor S1, a half-bridge driving module S2 and a synchronous BUCK module which are sequentially connected, wherein the output end of the synchronous BUCK module is connected with a laser tube S7 for driving a semiconductor laser; the output end of the synchronous BUCK module is also respectively connected with and transmits the sampled peak current and the sampled output current to the processor S1 through the peak current sampling module S3 and the output current sampling module S4.

Preferably, the synchronous BUCK module comprises two MOS transistors Q1 and Q2, a power inductor L1, and a filter capacitor C1; the two MOS tubes Q1 and Q2 are sequentially connected in series between a positive electrode output end VCC and a negative electrode of a power supply, and gates are respectively connected and controlled by a half-bridge driving module S2; the common joint and the power supply cathode of the two MOS tubes Q1 and Q2 are respectively connected with the anode and the cathode of the laser tube S7; the power inductor L1 comprises a main winding and an auxiliary winding, the main winding is connected in series between the common junction of the MOS tube Q1 and the MOS tube Q2 and the anode of the laser tube S7, and the auxiliary winding generates a peak current detection signal and provides the peak current detection signal to the peak current sampling module S3; the filter capacitor C1 is connected across the anode and cathode of the laser tube S7.

Preferably, the two MOS transistors Q1 and Q2 are N-channel MOSFETs; the drain electrode of the MOS tube Q1 is connected with the anode output end VCC of the power supply, the source electrode is connected with the drain electrode of the MOS tube Q2, and the source electrode of the MOS tube Q2 is connected with the cathode of the power supply.

Preferably, a sampling resistor R1 is connected in series between the negative end of the MOS transistor Q2 and the cathode of the laser tube S7, and the output current sampling module S4 collects the voltage across the sampling resistor R1 and provides the voltage to the processor S1.

Preferably, the power supply adopts an external high-power AC/DC power supply S5.

Preferably, the processor S1 is further connected to an external control signal transmission line S6.

Preferably, the external control signal transmission line S6 provides the processor S1 with a voltage signal, which is one of a constant voltage, a triangular wave, and a pulse signal having a frequency of not more than 5 KHz.

The utility model has the advantages that:

the semiconductor laser driving source for the laser radar adopts a working mode of synchronous rectification current feedback, and adopts a synchronous BUCK module switching mode, so that the power consumption can be greatly reduced, multiple working modes such as constant current and pulse are realized, the requirements of small volume, high efficiency, quick response and the like are met, the structure is simple, the installation and the maintenance are easy, and the popularization is facilitated.

Drawings

The utility model is further described with reference to the following figures and examples:

fig. 1 is a schematic diagram of a drive source of a semiconductor laser for laser radar according to the present invention.

Detailed Description

As shown in FIG. 1, the laser radar semiconductor laser driving source of the present invention comprises a processor S1, a half-bridge driving module S2, a synchronous BUCK module, a peak current sampling module S3, an output current sampling module S4, an external high power AC/DC power supply S5, an external control signal transmission line S6, a sampling resistor R1, and a laser tube S7.

The processor S1, the half-bridge driving module S2 and the synchronous BUCK module are sequentially connected, and the output end of the synchronous BUCK module is connected with a laser tube S7 for driving the semiconductor laser; the output end of the synchronous BUCK module is also respectively connected with and transmits the sampled peak current and the sampled output current to the processor S1 through the peak current sampling module S3 and the output current sampling module S4.

The high-power AC/DC power supply S5 supplies power to the whole system. The processor S1 is a core component of the whole module, the design adopts a PIC16F1777 device of Microchip company, an 8-bit mcu processor and a power supply control chip capable of supporting analog output are integrated in the device, and the device not only supports software programming control but also supports hardware rapid adjustment.

The synchronous BUCK module is a main power device of the whole module and comprises two MOS (metal oxide semiconductor) tubes Q1 and Q2, a power inductor L1 and a filter capacitor C1; the two MOS tubes Q1 and Q2 adopt N-channel MOSFETs, the drain electrode of the MOS tube Q1 is connected with the positive electrode output end VCC of the power supply, the source electrode is connected with the drain electrode of the MOS tube Q2, the source electrode of the MOS tube Q2 is connected with the negative electrode of the power supply, and the grid electrodes of the MOS tube Q1 and the Q2 are respectively connected and controlled by a half-bridge driving module S2; the common joint and the power supply cathode of the two MOS tubes Q1 and Q2 are respectively connected with the anode and the cathode of the laser tube S7; the power inductor L1 comprises a main winding and an auxiliary winding, the main winding is connected in series between the common junction of the MOS tube Q1 and the MOS tube Q2 and the anode of the laser tube S7, and the auxiliary winding generates a peak current detection signal and provides the peak current detection signal to the peak current sampling module S3; a sampling resistor R1 is also connected in series between the source of the MOS tube Q2 and the cathode of the laser tube S7, and the output current sampling module S4 collects the voltage at two ends of the sampling resistor R1 and provides the voltage to the processor S1. The filter capacitor C1 is connected across the anode and cathode of the laser tube S7.

The processor S1 is also connected to an external control signal transmission line S6 for receiving control signals from outside. The external control signal transmission line S6 provides the processor S1 with a voltage signal that is one of a constant voltage, a triangular wave, and a pulse signal having a frequency of not more than 5 KHz.

The voltage signal can be constant voltage, triangular wave, pulse (frequency is not more than 5 KHz) and the like, the MCU can generate a specific PWM signal according to the voltage signal to drive the MOS tubes Q1 and Q2, chop the voltage generated by the AC/DC power supply, and sequentially generate constant current, triangular wave current signals and pulse current signals for the laser tube of the load S7 through the filter inductor L1 and the filter capacitor C1;

the MCU adopts a hardware control mode, so that the response time is greatly reduced, and the delay time between the output current and the control signal can be controlled within 20 us;

the high-power AC/DC power supply S5, the external control signal S6 and the laser tube S7 in the schematic diagram belong to external supporting facilities and do not belong to the scope of the utility model.

The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose of the embodiments is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All modifications made according to the spirit of the main technical scheme of the utility model are covered in the protection scope of the utility model.

Claims

1. The semiconductor laser driving source for the laser radar is characterized by comprising a processor S1, a half-bridge driving module S2 and a synchronous BUCK module which are sequentially connected, wherein the output end of the synchronous BUCK module is connected with a laser tube S7 for driving a semiconductor laser; the output end of the synchronous BUCK module is also respectively connected with and transmits the sampled peak current and the sampled output current to the processor S1 through the peak current sampling module S3 and the output current sampling module S4.

2. The laser drive source of claim 1, wherein the synchronous BUCK module comprises two MOS transistors Q1, Q2, a power inductor L1, and a filter capacitor C1; the two MOS tubes Q1 and Q2 are sequentially connected in series between a positive electrode output end VCC and a negative electrode of a power supply, and gates are respectively connected and controlled by a half-bridge driving module S2; the common joint and the power supply cathode of the two MOS tubes Q1 and Q2 are respectively connected with the anode and the cathode of the laser tube S7; the power inductor L1 comprises a main winding and an auxiliary winding, the main winding is connected in series between the common junction of the MOS tube Q1 and the MOS tube Q2 and the anode of the laser tube S7, and the auxiliary winding generates a peak current detection signal and provides the peak current detection signal to the peak current sampling module S3; the filter capacitor C1 is connected across the anode and cathode of the laser tube S7.

3. The laser radar semiconductor laser drive source according to claim 2, wherein the two MOS transistors Q1 and Q2 are N-channel MOSFETs; the drain electrode of the MOS tube Q1 is connected with the anode output end VCC of the power supply, the source electrode is connected with the drain electrode of the MOS tube Q2, and the source electrode of the MOS tube Q2 is connected with the cathode of the power supply.

4. The laser radar semiconductor laser driving source as claimed in claim 2, wherein a sampling resistor R1 is connected in series between the negative terminal of the MOS transistor Q2 and the cathode of the laser diode S7, and the output current sampling module S4 collects the voltage across the sampling resistor R1 and provides the voltage to the processor S1.

5. The laser radar semiconductor laser drive source according to claim 4, wherein the power supply is an external high-power AC/DC power supply S5.

6. The laser radar semiconductor laser drive source according to claim 4, wherein the processor S1 is further connected to an external control signal transmission line S6.

7. The laser radar semiconductor laser driving source as claimed in claim 6, wherein the external control signal transmission line S6 provides the processor S1 with a voltage signal selected from a constant voltage, a triangular wave, and a pulse signal having a frequency of not more than 5 KHz.