CN217085258U - Drive pulse generation circuit and laser radar - Google Patents
Drive pulse generation circuit and laser radar Download PDFInfo
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- CN217085258U CN217085258U CN202220618419.3U CN202220618419U CN217085258U CN 217085258 U CN217085258 U CN 217085258U CN 202220618419 U CN202220618419 U CN 202220618419U CN 217085258 U CN217085258 U CN 217085258U
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Abstract
The utility model relates to the field of laser technology, a drive pulse generating circuit and laser radar are provided, above-mentioned drive pulse generating circuit includes: the device comprises an initial pulse generating unit, a differentiating unit and an AND gate; the output end of the initial pulse generating unit is respectively connected with the input end of the differentiating unit and the first input end of the AND gate; the output end of the differential unit is connected with the second input end of the AND gate; the initial pulse generating unit is used for generating an initial pulse; the output end of the AND gate outputs a target driving pulse. The utility model discloses a differential circuit produces sharp pulse, and then adopts AND gate and initial pulse AND, not only can produce the pulse that pulse width is extremely narrow, and circuit structure is simple, and is with low costs, and the target drive pulse who just produces has strict time sequence relation with initial pulse, can be convenient in the laser radar system realize complicated luminous time sequence control.
Description
Technical Field
The utility model belongs to the technical field of the laser, especially, relate to a drive pulse generating circuit and laser radar.
Background
The laser driving circuit is an important part of a laser radar system, and the requirement on the repetition frequency of the light emitting of the laser diode is higher and higher along with the popularization and application of the multi-line laser radar. With the increase of the repetition frequency, the driving signal usually adopts narrow pulses to reduce the average power, thereby reducing the thermal damage to the laser diode and improving the overall service life of the laser radar system.
In the prior art, an FPGA (field programmable gate array) can be adopted to increase the reference clock frequency of the FPGA so as to generate laser driving pulses smaller than 5ns, but the method is high in cost, the pulse width cannot reach 1-2ns, and the actual application requirements cannot be met.
SUMMERY OF THE UTILITY MODEL
In view of this, the embodiment of the utility model provides a drive pulse generating circuit and laser radar are provided to adopt FPGA to produce laser drive pulse among the solution prior art, with high costs, the not good problem of effect.
The embodiment of the utility model provides a first aspect provides a drive pulse generating circuit, include: the device comprises an initial pulse generating unit, a differentiating unit and an AND gate;
the output end of the initial pulse generating unit is respectively connected with the input end of the differentiating unit and the first input end of the AND gate;
the output end of the differential unit is connected with the second input end of the AND gate;
the initial pulse generating unit is used for generating an initial pulse;
the output end of the AND gate outputs a target driving pulse.
Optionally, the differentiating unit includes: a first resistor and a first capacitor;
the first end of the first capacitor is connected with the input end of the differential unit, and the second end of the first capacitor is respectively connected with the first end of the first resistor and the output end of the differential unit;
the second end of the first resistor is grounded.
Optionally, the driving pulse generating circuit further includes: a one-way conduction element;
the anode of the unidirectional conducting element is grounded, and the cathode of the unidirectional conducting element is respectively connected with the second end of the first capacitor, the first end of the first resistor and the output end of the differential unit.
Optionally, the unidirectional conducting element is a fast recovery schottky diode.
Optionally, the driving pulse generating circuit further includes: a current limiting unit;
the input end of the current limiting unit is connected with the output end of the AND gate, and the output end of the current limiting unit outputs driving pulse.
Optionally, the current limiting unit includes: a second resistor;
the first end of the second resistor is connected with the input end of the current limiting unit, and the second end of the second resistor is connected with the output end of the current limiting unit.
Optionally, the resistance of the second resistor is less than 10 Ω.
Optionally, initial pulse width T w The value range is as follows:
5τ<T w <10τ
τ＝RC
wherein, R is the resistance of the first resistor, C is the capacitance of the first capacitor, and τ is the time constant.
Optionally, the resistance range of the first resistor is 10 Ω to 30 Ω, and the capacitance range of the first capacitor is 330pF to 560 pF.
A second aspect of the embodiments of the present invention provides a laser radar, including any one of the driving pulse generating circuits and the laser diode driving device of the first aspect of the embodiments of the present invention;
the output end of the AND gate of the drive pulse generation circuit is connected with the laser diode drive device.
The embodiment of the utility model provides a drive pulse generating circuit and laser radar, above-mentioned drive pulse generating circuit includes: the device comprises an initial pulse generating unit, a differentiating unit and an AND gate; the output end of the initial pulse generating unit is respectively connected with the input end of the differentiating unit and the first input end of the AND gate; the output end of the differential unit is connected with the second input end of the AND gate; the initial pulse generating unit is used for generating an initial pulse; the output end of the AND gate outputs a target driving pulse. The embodiment of the utility model provides an in adopt differential circuit to produce sharp pulse, and then adopt AND gate and initial pulse AND phase, can produce the pulse that pulse width is extremely narrow, circuit structure is simple, and is with low costs.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive labor.
Fig. 1 is a schematic structural diagram of a driving pulse generating circuit according to an embodiment of the present invention;
fig. 2 is a waveform diagram corresponding to the drive pulse generating circuit shown in fig. 1;
fig. 3 is a schematic circuit diagram of a driving pulse generating circuit according to an embodiment of the present invention;
fig. 4 is a waveform diagram corresponding to the driving pulse generating circuit provided by the embodiment of the present invention when no unidirectional conducting element is provided;
fig. 5 is a waveform diagram corresponding to the driving pulse generating circuit provided by the embodiment of the present invention when the unidirectional conducting element is disposed;
fig. 6 is a schematic structural diagram of another driving pulse generating circuit according to an embodiment of the present invention.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
In order to explain the technical solution of the present invention, the following description is made by using specific examples.
Referring to fig. 1, an embodiment of the present invention provides a driving pulse generating circuit, including: an initial pulse generating unit 11, a differentiating unit 12 and an and gate U1;
the output end of the initial pulse generating unit 11 is respectively connected with the input end of the differentiating unit 12 and the first input end a of the and gate U1;
the output of the differentiating unit 12 is connected to a second input B of the and gate U1;
the initial pulse generating unit 11 is used for generating an initial pulse;
the output terminal C of the and gate U1 outputs the target drive pulse.
In the embodiment of the invention, the differentiating unit 12 is adopted to generate the sharp pulse wave, and the rising edge time of the sharp pulse is short, and the high-frequency characteristic is good. For example, referring to fig. 2, according to the characteristics of the and gate U1, when both input terminals are high, the and gate U1 outputs a high level. The sharp pulse and the initial pulse (tens of ns) can output a very narrow driving pulse (1-2ns), the circuit structure is simple, the cost is low, and the pulse width can meet the requirement of faster light-emitting repetition frequency, so that the method is suitable for practical application.
Meanwhile, referring to fig. 2, since the rising edge of the sharp pulse generated by the differential unit is fast, the sharp pulse and the initial pulse have a strict time sequence relationship, and further the driving pulse and the initial pulse also have a strict time sequence relationship, complex light-emitting time sequences and MEMS synchronous light-emitting time sequences can be conveniently realized in the multi-line laser radar and the MEMS laser radar, the clock requirement on the initial pulse generating unit is reduced, and the cost is reduced.
In some embodiments, referring to fig. 3, the differentiating unit 12 may include: a first resistor R1 and a first capacitor C1;
a first end of the first capacitor C1 is connected to the input end of the differentiating unit 12, and a second end of the first capacitor C1 is connected to a first end of the first resistor R1 and the output end of the differentiating unit 12, respectively;
the second terminal of the first resistor R1 is connected to ground.
In the embodiment of the invention, a capacitance-resistance differential circuit can be adopted, and the device is simple, low in cost and good in effect. Since the pulse width is related to the time constant of the differentiating circuit, the time constant can be adjusted by adjusting the parameters of the first capacitor C1 and the first resistor R1, so as to adjust the width of the target driving pulse.
In some embodiments, the first capacitor C1 may be a non-polar capacitor.
In some embodiments, referring to fig. 3, the driving pulse generating circuit may further include: a one-way conduction element D1;
the anode of the one-way conducting element D1 is grounded, and the cathode of the one-way conducting element D1 is connected to the second terminal of the first capacitor C1, the first terminal of the first resistor R1 and the output terminal of the differentiating unit 12.
In the embodiment of the present invention, referring to fig. 4, at the falling edge of the initial pulse, the differentiating unit 12 generates a negative spike, which is input to the and gate U1, and may have a certain effect on the and gate U1, causing damage to the and gate U1. Therefore, referring to fig. 3, in the embodiment of the present invention, the one-way conducting element D1 is provided, when the differentiating unit 12 generates a negative spike, the one-way conducting element D1 is turned on, and the voltage at the second input terminal B of the and gate U1 is clamped, so that the potential at this point is not too low, and the device is prevented from being damaged due to the influence of the and gate U1. Meanwhile, the potential at this point is slowly restored to 0V by the differentiating unit 12, for example, refer to fig. 5.
In some embodiments, referring to fig. 3, the unidirectional conducting element D1 may be a schottky diode.
The Schottky diode has good switching characteristic and short reverse recovery time, and meets the requirement of high-frequency application. And the forward voltage of the Schottky diode is reduced, namely the clamping voltage is low, so that the safety of the AND gate U1 is ensured, and the quality of an input waveform of the AND gate U1 is improved.
In some embodiments, the forward voltage drop of the schottky diode may be 0.35V.
In some embodiments, the recovery time of the schottky diode may be less than 20 ns.
The schottky diode can clamp the voltage of the second input terminal B of the and gate U1 at-0.35V, which ensures the safety of the and gate U1.
In some embodiments, referring to fig. 6, the driving pulse generating circuit may further include: a current limiting unit 13;
the input terminal of the current limiting unit 13 is connected to the output terminal C of the and gate U1, and the output terminal of the current limiting unit 13 outputs a driving pulse.
When the driving pulse generating circuit is used for driving the laser diode driving device, an oscillation signal is generated when the laser diode driving device is rapidly switched on and off, and the waveform of the driving pulse is influenced. Therefore, in the embodiment of the present invention, the output terminal C of the and gate U1 is connected to the current limiting unit 13 for preventing the influence of the oscillation signal and improving the waveform of the driving signal.
In some embodiments, referring to fig. 3, the current limiting unit 13 may include: a second resistor R2;
a first terminal of the second resistor R2 is connected to the input terminal of the current limiting unit 13, and a second terminal of the second resistor R2 is connected to the output terminal of the current limiting unit 13.
In some embodiments, the resistance of the second resistor R2 may be less than 10 Ω.
The current limiting unit 13 may be a resistor. To improve the waveform quality of the target drive pulse and eliminate overshoot and ringing, the second resistor R2 need not be large, and should typically be less than 10 Ω.
Further, the resistance of the second resistor R2 may also be 0 Ω to ensure the fastest frequency response.
In some embodiments, the initial pulse width T w The value ranges of (a) may be:
5τ<T w <10τ
τ＝RC
wherein, R is the resistance of the first resistor R1, C is the capacitance of the first capacitor C1, and τ is the time constant.
In the embodiment of the present invention, the differentiating unit 12 is formed by a resistor and a capacitorAccording to the characteristics of the differential of resistance and capacitance, if
The pulse waveform output by the differentiating unit 12 is wide, and cannot generate a narrow driving pulse after passing through the and gate U1; if there is
The output pulse waveform of the differentiating unit 12 is too narrow, and the and gate U1 can not generate ideal driving pulse; when the initial pulse width T w Satisfies 5 tau<T w <At 10 τ, the waveform output by the differentiating unit 12 is better and can be used to generate a driving pulse according to the requirements of practical applications.
Further, since τ is RC, the initial pulse width T w The value ranges of the first resistor R1 and the first capacitor C1 are limited, and the initial pulse width T is w When determined, the parameters of the first resistor R1 and the first capacitor C1 may be fine-tuned within the above ranges to adjust the width of the target driving pulse.
In some embodiments, the resistance of the first resistor R1 may range from 10 Ω to 30 Ω, and the capacitance of the first capacitor C1 may range from 330pF to 560 pF.
When the resistance of the first resistor R1 is 10 Ω and the capacitance of the first capacitor C1 is 560pF, a target driving pulse having a width of about 2ns can be output. The target driving pulse with a width of 1ns can be output by adjusting the first resistor R1 and the first capacitor C1.
Corresponding to any kind of above-mentioned drive pulse generating circuit, the embodiment of the utility model also provides a laser radar, this laser radar includes any kind of above-mentioned drive pulse generating circuit and laser diode drive arrangement;
the output end of the AND gate of the drive pulse generation circuit is connected with the laser diode drive device.
The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; 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 substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (10)
1. A drive pulse generation circuit characterized by comprising: the device comprises an initial pulse generating unit, a differentiating unit and an AND gate;
the output end of the initial pulse generating unit is respectively connected with the input end of the differentiating unit and the first input end of the AND gate;
the output end of the differential unit is connected with the second input end of the AND gate;
the initial pulse generating unit is used for generating an initial pulse;
and the output end of the AND gate outputs a target driving pulse.
2. The drive pulse generating circuit according to claim 1, wherein the differentiating unit includes: a first resistor and a first capacitor;
the first end of the first capacitor is connected with the input end of the differential unit, and the second end of the first capacitor is respectively connected with the first end of the first resistor and the output end of the differential unit;
the second end of the first resistor is grounded.
3. The drive pulse generating circuit according to claim 2, further comprising: a one-way conduction element;
the anode of the unidirectional conducting element is grounded, and the cathode of the unidirectional conducting element is respectively connected with the second end of the first capacitor, the first end of the first resistor and the output end of the differential unit.
4. The drive pulse generating circuit according to claim 3, wherein the unidirectional conducting element is a fast recovery Schottky diode.
5. The drive pulse generating circuit according to claim 2, further comprising: a current limiting unit;
the input end of the current limiting unit is connected with the output end of the AND gate, and the output end of the current limiting unit outputs the driving pulse.
6. The drive pulse generating circuit according to claim 5, wherein the current limiting unit includes: a second resistor;
the first end of the second resistor is connected with the input end of the current limiting unit, and the second end of the second resistor is connected with the output end of the current limiting unit.
7. The drive pulse generating circuit according to claim 6, wherein the resistance value of the second resistor is less than 10 Ω.
8. The drive pulse generating circuit according to claim 2, wherein the initial pulse width T is w The value range is as follows:
5τ<T w <10τ
τ＝RC
wherein, R is the resistance of the first resistor, C is the capacitance of the first capacitor, and τ is the time constant.
9. The drive pulse generating circuit according to claim 8, wherein the resistance value of said first resistor is in a range of 10 Ω to 30 Ω, and the capacitance value of said first capacitor is in a range of 330pF to 560 pF.
10. A laser radar comprising the drive pulse generation circuit and the laser diode drive device according to any one of claims 1 to 9;
and the output end of the AND gate of the driving pulse generation circuit is connected with the laser diode driving device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220618419.3U CN217085258U (en) | 2022-03-21 | 2022-03-21 | Drive pulse generation circuit and laser radar |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220618419.3U CN217085258U (en) | 2022-03-21 | 2022-03-21 | Drive pulse generation circuit and laser radar |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217085258U true CN217085258U (en) | 2022-07-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220618419.3U Active CN217085258U (en) | 2022-03-21 | 2022-03-21 | Drive pulse generation circuit and laser radar |
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| CN (1) | CN217085258U (en) |
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2022
- 2022-03-21 CN CN202220618419.3U patent/CN217085258U/en active Active
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