CN114859324B - Utilize TVS's laser radar transmission and detection circuitry - Google Patents
Utilize TVS's laser radar transmission and detection circuitry Download PDFInfo
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- CN114859324B CN114859324B CN202210780640.3A CN202210780640A CN114859324B CN 114859324 B CN114859324 B CN 114859324B CN 202210780640 A CN202210780640 A CN 202210780640A CN 114859324 B CN114859324 B CN 114859324B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/483—Details of pulse systems
- G01S7/484—Transmitters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/497—Means for monitoring or calibrating
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/10—Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation
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- Radar, Positioning & Navigation (AREA)
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Abstract
The invention discloses a laser radar transmitting and detecting circuit using TVS; the device comprises an emission module, a control module and a detection module, wherein the emission module is electrically connected with the control module, and the detection module is also electrically connected with the control module; according to the invention, the TVS tube D2 is provided with the detection circuit which is simple in structure and quick in response, so that the whole emission system has a feedback link to form a closed-loop control flow; collecting current signals actually flowing through the laser diode through a detection circuit of the TVS, and diagnosing whether the laser diode works normally or not; the detection circuit directly collects the signals emitted by the laser emitter, and the sampling time is accurate, so that the difficulty of a software compensation algorithm is avoided; TVS tube D2 and laser diode LD are connected in series, and the time of the detection signal obtained from TVS tube D2 is the same time as the actual emission signal of laser, thus omitting fussy time compensation processing, improving the accuracy of flight time calculation and further achieving better measurement accuracy.
Description
Technical Field
The invention belongs to the technical field of laser radars, and particularly relates to a laser radar transmitting and detecting circuit utilizing TVS.
Background
The existing laser transmitting circuit generally comprises a control circuit and a transmitting circuit, wherein the control circuit provides a driving signal for the transmitting circuit, the transmitting circuit completes the transmission of laser, the system control is open-loop control, the feedback and the closed loop cannot be realized, and meanwhile, because the front end circuit of the laser radar transmitting circuit has a complex structure, the random time error introduced by the system is increased, and the deviation factor of the calculation of the flight time is increased.
The laser emission circuit, the laser emission control method and the laser radar disclosed in the authorization notice number CN114594453A, wherein the laser emission circuit comprises: a light emitting module configured to emit a probe beam for detecting a target; an energy storage module coupled with the light emitting module; the driving module is suitable for driving the light emitting module to emit light; a pre-charging module coupled to the energy storage module for charging the energy storage module; and the discharge module is respectively coupled with the pre-charging module and the energy storage module and is suitable for discharging the energy storage module before the pre-charging module charges the energy storage module. Although the stability of good laser radar luminous energy is achieved, and the detection performance of the laser radar is improved, the problems that only laser emission can be driven, acquisition and detection feedback is not achieved, if a laser diode is damaged, a processor cannot sense the damage, the driving signal of the processor is used as laser flight time to start timing, but actually the driving signal can trigger the laser emission after passing through an amplifying and driving circuit, the amplifying and driving circuit arranged in front can introduce large system delay, time errors can be caused due to factors such as device consistency and circuit board layout, the flight time is difficult to calculate, complex algorithm compensation is needed to be carried out by software and the like are solved, and therefore the laser radar emitting and detecting circuit using the TVS is provided.
Disclosure of Invention
The present invention is directed to a lidar transmitting and detecting circuit using TVS to solve the above-mentioned problems.
In order to achieve the purpose, the invention provides the following technical scheme: a laser radar transmitting and detecting circuit utilizing TVS comprises a transmitting module, a control module and a detecting module, wherein the transmitting module is electrically connected with the control module, and the detecting module is also electrically connected with the control module;
the transmitting module is used for transmitting laser and realizing the transmission of laser radar signals;
the control module is used for controlling the laser emission of the emission module and realizing the operation calculation processing of various algorithms;
the detection module is used for detecting the working state of the laser emitting circuit;
in the laser emission circuit, the emission module emits laser signals, the emission module adopts a laser of a laser diode electronic component, the control module controls the laser emission of the emission module, and the detection module detects, processes and outputs the laser emission signals;
the detection module comprises a TVS tube D2, the TVS tube D2 is electrically connected with the control module, one end of the TVS tube D2 is electrically connected with the source electrode of the MOS tube Q1, and one side of the TVS tube D2 is electrically connected with a divider resistor connected in series; the voltage dividing resistor comprises a resistor R2 and a resistor R3, the resistor R2 and the resistor R3 are respectively and electrically connected to two ends of the TVS tube D2, and a detection signal output circuit is electrically connected between the resistor R2 and the resistor R3;
the resistor R3 is electrically connected with one end of the TVS tube D2 and is grounded, and the voltage stabilizing diode D1 is electrically connected with the other end of the filter capacitor C1 and is grounded.
Preferably, the control module includes an MOS transistor Q1 therein, the gate of the MOS transistor Q1 is electrically connected to a driver U1, and the driver U1 is configured to drive the MOS transistor Q1.
Preferably, the MOS transistor Q1 is a gallium nitride MOS transistor, the MOS transistor Q1 is electrically connected to the emission module, and the MOS transistor Q1 is used for controlling and regulating laser emission.
Preferably, the transmitting module comprises a laser diode LD, a cathode of the laser diode LD is electrically connected with the control module, and an anode of the laser diode LD is electrically connected with a laser driving power supply.
Preferably, the cathode of the laser diode LD is electrically connected to the drain of the MOS transistor Q1, and a protection circuit is electrically connected between the laser diode LD and the laser driving power supply.
Preferably, the protection circuit includes a voltage stabilizing diode D1, a filter capacitor C1 and a current limiting resistor R1, and the voltage stabilizing diode D1 and the filter capacitor C1 are connected in parallel.
Preferably, the current limiting resistor R1 is electrically connected between the laser diode LD and the laser driving power supply, and one end of the zener diode D1 and one end of the filter capacitor C1 are electrically connected between the current limiting resistor R1 and the laser driving power supply.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, the TVS tube D2 is skillfully used, and the detection circuit which is simple in structure and quick in response is designed, so that the whole transmitting system has a feedback link to form a closed-loop control flow; the TVS detection circuit has the advantages of simple structure, quick response, low cost and high stability, and the current signal actually flowing through the laser diode is collected by designing the TVS-based detection circuit, so that whether the laser diode normally works or not is directly diagnosed;
in the traditional design, a laser driving signal is used as a flying time for starting timing, actually, the device delay of a control circuit can reach ns level, and the control circuit is complex, so that more discrete and random errors are introduced, so that the compensation is more difficult; TVS tube D2 and laser diode LD are connected in series, so that the time of the detection signal obtained from TVS tube D2 is the same time as the actual emission signal of the laser, thereby omitting fussy time compensation processing, improving the accuracy of flight time calculation and achieving better measurement accuracy.
Drawings
FIG. 1 is a schematic block diagram of a system of the present invention;
FIG. 2 is a circuit diagram of the system of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be 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 only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
Referring to fig. 1-2, the present invention provides a technical solution: a laser radar transmitting and detecting circuit utilizing TVS comprises a transmitting module, a control module and a detecting module, wherein the transmitting module is electrically connected with the control module, and the detecting module is also electrically connected with the control module;
the transmitting module is used for transmitting laser and realizing the transmission of laser radar signals;
the control module is used for controlling the laser emission of the emission module and realizing the operation calculation processing of various algorithms;
the detection module is used for detecting the working state of the laser emitting circuit;
in the laser emission circuit, the emission module emits laser signals, the emission module adopts a laser of a laser diode electronic component, the control module controls the laser emission of the emission module, and the detection module detects, processes and outputs the laser emission signals.
In order to realize the control and adjustment of the laser emission process of the emission module and the drive control of the MOS transistor Q1, in this embodiment, preferably, the control module includes the MOS transistor Q1 therein, the gate of the MOS transistor Q1 is electrically connected to a driver U1, and the driver U1 is used for driving the MOS transistor Q1.
In order to effectively realize the accurate control of the emission process of the emission module, in this embodiment, preferably, the MOS transistor Q1 is a gallium nitride MOS transistor, the MOS transistor Q1 is electrically connected to the emission module, and the MOS transistor Q1 is used for controlling and adjusting the laser emission.
In order to enable the transmitting module to effectively transmit a laser signal and achieve normal operation of the system, in this embodiment, preferably, the transmitting module includes a laser diode LD, a cathode of the laser diode LD is electrically connected to the control module, and an anode of the laser diode LD is electrically connected to a laser driving power supply.
In order to realize the control and driving of the laser diode LD and the safety protection of the laser diode LD, in this embodiment, preferably, a negative electrode of the laser diode LD is electrically connected to a drain of the MOS transistor Q1, and a protection circuit is electrically connected between the laser diode LD and the laser driving power supply.
In order to effectively control the power supply process, maintain the voltage stable, and prevent the current from being too high and damaging the laser diode LD, in this embodiment, preferably, the protection circuit includes a voltage stabilizing diode D1, a filter capacitor C1, and a current limiting resistor R1, and the voltage stabilizing diode D1 and the filter capacitor C1 are connected in parallel.
In order to implement processing of the power supply process, firstly, voltage stabilization is implemented, voltage fluctuation and clutter influence are prevented, and current limiting processing is implemented on current, in this embodiment, preferably, the current limiting resistor R1 is electrically connected between the laser diode LD and the laser driving power supply, and one end of the zener diode D1 and one end of the filter capacitor C1 are electrically connected between the current limiting resistor R1 and the laser driving power supply.
In order to realize the detection of the emission process of the emission module and the closed-loop feedback regulation, in this embodiment, it is preferable that the detection module includes a TVS tube D2, the TVS tube D2 is electrically connected to the control module, one end of the TVS tube D2 is electrically connected to the source of the MOS tube Q1, one side of the TVS tube D2 is electrically connected to a voltage dividing resistor connected in series, and the TVS tube D2 utilizes the quick response characteristic of the TVS tube D2 when the laser diode LD emits a laser signal, can be quickly broken down within tens of ps and allow a large current to pass, and simultaneously utilizes the voltage clamping function of the TVS tube D2, and the junction of the TVS tube D2 and the MOS tube Q1 in the control circuit obtains a stable clamping level signal.
In order to divide the TVS clamping voltage into the voltage range allowed by the processor, in this embodiment, preferably, the voltage dividing resistor includes a resistor R2 and a resistor R3, the resistor R2 and the resistor R3 are electrically connected to two ends of the TVS tube D2, a detection signal output line is electrically connected between the resistor R2 and the resistor R3, and the voltage dividing resistor is bridged across two ends of the TVS tube D2, so that the TVS clamping voltage can be divided into the voltage range allowed by the processor, and the processor can accurately and quickly receive the feedback signal emitted by the laser diode LD at the time of emission.
In order to implement effective safety protection of the system and implement loop connection, in this embodiment, preferably, the resistor R3 is electrically connected to one end of the TVS tube D2 and grounded, and the zener diode D1 is electrically connected to the other end of the filter capacitor C1 and grounded.
The working principle and the using process of the invention are as follows:
when a laser diode LD in the emission module is conducted to emit laser, a laser driving power supply is controlled to be at a proper voltage, meanwhile, a voltage stabilizing diode D1 and a filter capacitor C1 are used for carrying out clamping protection and filtering on the power supply, a driving pulse signal is input from an input end of a driver U1 in the control module, the pulse signal is usually the pulse width of dozens of to hundreds of nanoseconds, and during the high level duration of the pulse signal, an MOS tube Q1 is conducted so as to conduct the laser diode LD and emit the laser signal.
In the conventional design, the source electrode of an MOS tube Q1 is directly grounded, the source electrode of the MOS tube Q1 is connected with a TVS tube D2 in a detection module, the TVS tube D2 is usually added on a signal or power line and is used as an electrostatic or surge protection device, the invention skillfully utilizes the characteristics of voltage clamping and quick response of the TVS tube D2, the source electrode of the MOS tube Q1 is connected with the negative electrode of the TVS tube D2, the positive electrode of the TVS tube D2 is grounded, at the moment of conduction of a laser diode LD, the TVS tube D2 can be instantaneously broken down at the ps level and emit allowable large current (usually, dozens of amperes) through the laser diode LD, meanwhile, the TVS tube D2 has the function of clamping voltage, the digital signal level which can be identified by a processor can be directly output by using a simple divider resistor, the divider resistor comprises a resistor R2 and a resistor R3, the resistor R2 and the resistor R3 are bridged at two ends of the TVS tube D2, the TVS tube D2 can divide the TVS voltage into the voltage range of the processor, so as to realize that the accurate feedback of laser signal emission of the TVS diode LD at the moment can be accurately received.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (2)
1. A laser radar transmitting and detecting circuit utilizing TVS is characterized by comprising a transmitting module, a control module and a detecting module, wherein the transmitting module is electrically connected with the control module, and the detecting module is also electrically connected with the control module;
the transmitting module is used for transmitting laser and realizing the transmission of laser radar signals;
the control module is used for controlling the laser emission of the emission module and realizing the operation calculation processing of various algorithms;
the detection module is used for detecting the working state of the laser emitting circuit;
in the laser emission circuit, a laser signal is emitted through the emission module, the emission module adopts a laser of a laser diode electronic component, the control module controls the laser emission of the emission module, and the detection module detects, processes and outputs the laser emission signal;
the control module comprises an MOS tube Q1, a driver U1 is electrically connected to the grid electrode of the MOS tube Q1, and the driver U1 is used for driving the MOS tube Q1;
the MOS tube Q1 is a gallium nitride MOS tube, the MOS tube Q1 is electrically connected with the emission module, and the MOS tube Q1 is used for controlling and adjusting laser emission;
the transmitting module comprises a laser diode LD, the cathode of the laser diode LD is electrically connected with the control module, and the anode of the laser diode LD is electrically connected with a laser driving power supply;
the cathode of the laser diode LD is electrically connected with the drain electrode of the MOS tube Q1, and a protection circuit is electrically connected between the laser diode LD and the laser driving power supply;
the protection circuit comprises a voltage stabilizing diode D1, a filter capacitor C1 and a current limiting resistor R1, wherein the voltage stabilizing diode D1 is connected with the filter capacitor C1 in parallel;
the detection module comprises a TVS tube D2, the TVS tube D2 is electrically connected with the control module, one end of the TVS tube D2 is electrically connected with the source electrode of the MOS tube Q1, and one side of the TVS tube D2 is electrically connected with a divider resistor connected in parallel; the voltage dividing resistor comprises a resistor R2 and a resistor R3, the resistor R2 and the resistor R3 are respectively and electrically connected to two ends of the TVS tube D2, and a detection signal output circuit is electrically connected between the resistor R2 and the resistor R3;
the resistor R3 is electrically connected with one end of the TVS tube D2 to be grounded, and the voltage stabilizing diode D1 is electrically connected with the other end of the filter capacitor C1 to be grounded.
2. The laser radar transmitting and detecting circuit using TVS according to claim 1, wherein: the current-limiting resistor R1 is electrically connected between the laser diode LD and the laser driving power supply, and one ends of the voltage-stabilizing diode D1 and the filter capacitor C1 are electrically connected between the current-limiting resistor R1 and the laser driving power supply.
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| CN202210780640.3A CN114859324B (en) | 2022-07-05 | 2022-07-05 | Utilize TVS's laser radar transmission and detection circuitry |
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| CN202210780640.3A CN114859324B (en) | 2022-07-05 | 2022-07-05 | Utilize TVS's laser radar transmission and detection circuitry |
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| CN115372940A (en) * | 2022-10-24 | 2022-11-22 | 天津光电集团有限公司 | Laser radar transmitting and online diagnosing system |
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