CN207799065U - Pulse type laser ranging receiving circuit - Google Patents
Pulse type laser ranging receiving circuit Download PDFInfo
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- CN207799065U CN207799065U CN201820135942.4U CN201820135942U CN207799065U CN 207799065 U CN207799065 U CN 207799065U CN 201820135942 U CN201820135942 U CN 201820135942U CN 207799065 U CN207799065 U CN 207799065U
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Abstract
Pulse type laser ranging receiving circuit, including master controller, master controller is connected with high-voltage generating unit, high-voltage detecting circuit, temperature sensing circuit, digital filter circuit and time difference measurement circuit, the output end of high-voltage generating unit connects APD units, and the output end of APD units is connected with I/V conversion circuits, gain amplifying circuit and constant fraction discriminator circuit in turn；The output end of constant fraction discriminator circuit connects digital filter circuit；Digital filter circuit connects time difference measurement circuit, and high-voltage generating unit connects high-pressure generating circuit；The utility model, high sensitivity, detection range is remote, high certainty of measurement, and it is wide to adapt to environment；Mainly apply to laser radar receiving terminal.
Description
Technical field
The utility model is related to laser ranging technique fields, and in particular to a kind of pulse type laser ranging receiving circuit.
Background technology
With the development of laser ranging industry, it is indispensable that the laser ranging based on pulsed has become civilian and industry
A part, major domain have been related to laser radar and artificial intelligence industry etc..The laser ranging of pulsed has measuring speed
Soon, the characteristics of far measuring distance, cardinal principle was designed based on the laser flying time difference, since it is to measure transmitting and reception
Between time difference spacing, and the light reflectivity of the object of unlike material, color is also different, so in unlike material, the object of color
Cause measurement error bigger than normal under body, meanwhile, the variation of its jet lag can be also influenced under different environment temperatures.
Utility model content
For the deficiency in the presence of the prior art, the utility model provides pulse type laser ranging receiving circuit, solution
Determined laser ranging receiving circuit to the correction of signal the problem of.
To achieve the above object, the utility model uses the following technical solution：Pulse type laser ranging receiving circuit,
Including master controller, master controller is connected with high-voltage generating unit, high-voltage detecting circuit, temperature sensing circuit, digital filtering electricity
The output end of road and time difference measurement circuit, high-voltage generating unit connects APD units, and the output end of APD units is connected with I/ in turn
V conversion circuits, gain amplifying circuit and constant fraction discriminator circuit；The output end of constant fraction discriminator circuit connects digital filter circuit；Number
Word filter circuit connects time difference measurement circuit, and high-voltage generating unit connects high-pressure generating circuit；
The temperature sensing circuit：By the operating ambient temperature real-time Transmission of APD units to master controller；
The APD units：For detecting the reflected laser signals being projected on object and converting optical signals into electric current letter
Number output；
The I/V conversion circuits：The current signal that APD units export is converted into voltage signal；
The gain amplifying circuit：Voltage amplification will be carried out for voltage signal；
The constant fraction discriminator circuit：Amplified signal is compared Ratio invariableness and shaping；
Digital filter circuit filters out the part clutter after shaping；Filtered signal enters time difference measurement circuit,
It is accurate to measure the laser flying time difference and Echo width and information is fed back into controller end.
Further, high-voltage generating unit includes high-pressure generating circuit and filter circuit；High-pressure generating circuit includes chip
U1, chip U1 are the enhanced high-voltage MOS pipe of N-channel, and 1 foot of the model ZVN4525 of chip U1, chip U1 are metal-oxide-semiconductor first
Drain electrode foot, 5 feet are the drain electrode of metal-oxide-semiconductor second, 6 feet are that metal-oxide-semiconductor third drains and 2 be that metal-oxide-semiconductor the 4th drains, 1 foot of chip U1
It is connected with inductance L1, the other end of inductance L1 connects fusing resistor B1, and the other end of fusing resistor B1 connects 5V power supplys, 5V power supplys
It is also associated with capacitance C1, the other end of capacitance C1 connects AC ground ACGND, after the 3 foot series resistance R2 of grid of chip U1
Connect AC ground ACGND；4 foot of source electrode of chip U1 connects AC ground ACGND, and 6 feet of chip U1 are connected with connection
There is capacitance C2, AC ground ACGND is connected after the other end series resistance R1 of capacitance C2；6 feet of chip U1 are as high pressure
Raw circuit output end；The drain electrode of metal-oxide-semiconductor first foot, the drain electrode of metal-oxide-semiconductor second foot, metal-oxide-semiconductor third drain electrode foot and the drain electrode foot of metal-oxide-semiconductor the 4th
Connection；
Filter circuit include capacitance C3, capacitance C3 one end be connected with capacitance C4 and resistance R3, capacitance C3 and capacitance
The other end of C4 connects AC ground ACGND, and the other end of resistance R3 is connected with capacitance C5 and resistance R4, and capacitance C5's is another
One end connects AC ground ACGND；Output end of the other end of resistance R4 as high-voltage generating unit；Capacitance C3 is as filter
The input terminal of wave circuit；
Switching diode D1 is connected between filter circuit and high-pressure generating circuit, the anode of switching diode D1 connects core
6 feet of piece U1；Diode D1 cathodes connect the input terminal of filter circuit, and diode D1 cathodes are as voltage detecting end.
Further, high pressure checks that circuit includes chip U2, and chip U2 selects LMV321,1 foot of positive input foot of chip U2
It is connected with resistance R5, resistance R6 and capacitance C7, the other end of resistance R5 checks the input terminal of circuit, resistance R6 and electricity as high pressure
Hold the other end ground connection of C7,3 foot of negative input of chip U2 is connect with 4 foot of amplified signal output pin of chip U2 and conduct
High pressure checks the output end of circuit.
Further, temperature sensing circuit includes sensor U3, model MCP9700.
Further, I/V conversion circuits include chip IC 1,1 model MAX3665 of chip IC, the power end of chip IC 1
1 foot is connected with inductance B0 and capacitance CU2,8 foot of ground terminal of chip IC 1 and 5 feet ground connection, and 7 foot of the first output end of chip IC 1 connects
It is connected to inductance L3, the other end that 6 foot of second output terminal of chip IC 1 is connected with inductance L2, inductance L3 and inductance L2 is in series with electricity
Output end of the both ends of appearance RX, capacitance RX as I/V conversion circuits；
2 foot of input terminal of chip IC 1 connects APD units, and APD units include S1, and S1 is that APD is managed or PIN is managed, and the 2 of S1
Foot is the photosignal output end of S1, and input terminal is used as after the 1 foot series resistance RS of benchmark high voltage input terminal of S1；The benchmark of S1
1 foot of high voltage input terminal is also associated with capacitance CU1.
Further, gain amplifying circuit includes chip IC 2, the model AD8330 of IC2.
Further, constant fraction discriminator circuit includes delay circuit, signal attenuation circuit and signal transformation circuit；Delay circuit
With the output end connection signal shaping circuit of signal attenuation circuit, the output end of signal transformation circuit is as constant fraction discriminator circuit
Output end；The input terminal of delay circuit and the input terminal of signal attenuation circuit as constant fraction discriminator circuit.
Compared with the prior art, the utility model has the advantages that：The utility model, zero degree is high, detection range
Far, it is wide to adapt to environment for high certainty of measurement；Mainly apply to laser radar receiving terminal.
Told master controller is controlled by high speed FPGA for core, is mainly read defeated from APD unit environments temperature, high pressure
The control and regulation that go out, control and time difference measurement circuit data is read, according to measuring jet lag and Echo width is modified
And compensation.Controller controls variable amplifying circuit using related resource so that gain amplifier is in stable state.
The digital filter circuit, the circuit are mainly made of number and simulation, which will come from constant fraction discriminator circuit
Signal be filtered, and export the authenticity for carrying out precisely judging signal to master controller, while the circuit is another
End output connects the input terminal of time difference measurement circuit.To more preferably judge whether the signal measured is correct.
Told IV conversion circuit has the characteristics of transmission bandwidth of superelevation, low distortion.
Description of the drawings
Fig. 1 is the utility model circuit block diagram；
Fig. 2 is high-voltage generating unit circuit diagram；
Fig. 3 is that high pressure checks circuit；
Fig. 4 is temperature sensing circuit；
Fig. 5 is I/V conversion circuits；
Fig. 6 is gain amplifying circuit；
Fig. 7 is sensor circuit figure.
Specific implementation mode
Implementation column 1
The utility model is described further below in conjunction with the accompanying drawings.
As shown in Figure 1, a kind of pulse type laser ranging receiving circuit described in the utility model, including master controller, it is main
Controller is connected with high-voltage generating unit, high-voltage detecting circuit, temperature sensing circuit, digital filter circuit and time difference measurement electricity
The output end on road, high-voltage generating unit connects APD units, and the output end of APD units is connected with I/V conversion circuits, gain in turn
Amplifying circuit and constant fraction discriminator circuit；The output end of constant fraction discriminator circuit connects digital filter circuit；Digital filter circuit connects
Time difference measurement circuit, high-voltage generating unit connect high-pressure generating circuit；
The temperature sensing circuit：By the operating ambient temperature real-time Transmission of APD units to master controller；
The APD units：For detecting the reflected laser signals being projected on object and converting optical signals into electric current letter
Number output；
The I/V conversion circuits：The current signal that APD units export is converted into voltage signal；
The gain amplifying circuit：Voltage amplification will be carried out for voltage signal；
The constant fraction discriminator circuit：Amplified signal is compared Ratio invariableness and shaping；
Digital filter circuit filters out the part clutter after shaping；Filtered signal enters time difference measurement circuit,
It is accurate to measure the laser flying time difference and Echo width and information is fed back into controller end.
Told master controller is controlled by high speed FPGA for core, is mainly read defeated from APD unit environments temperature, high pressure
The control and regulation that go out, control and time difference measurement circuit data is read, according to measuring jet lag and Echo width is modified
And compensation.Controller controls variable amplifying circuit using related resource so that gain amplifier is in stable state.
Told APD units are used for detecting object reflected light, and APD units convert optical signals into current signal output end and I/
V conversion circuits connect；
The high-pressure generating circuit, for generating the adjustable high pressure within DC voltage 100V-200V, adjustable voltage point
Resolution is 0.5V, and voltage output end is connect with the backward end of APD units, and ensures the stability of APD unit reversed bias voltages；
The digital filter circuit, the circuit are mainly made of number and simulation, which will come from constant fraction discriminator circuit
Signal be filtered, and export the authenticity for carrying out precisely judging signal to master controller, while the circuit is another
End output connects the input terminal of time difference measurement circuit.To more preferably judge whether the signal measured is correct；
The information of acquisition is fed back to master by the high-voltage detecting circuit, the high pressure for acquiring and feeding back APD units upper end
Controller, by the increase and reduction of main controller controls High voltage output.
The temperature sensing circuit, for detecting environment temperature and transmitting a master controller, master controller is according to environment temperature
It spends size and high pressure compensation is carried out to APD units, to make APD units that can also be operated in optimum state under various environment temperatures；
So that APD units can have good gain at different ambient temperatures, to preferably be received back wave stability；
There is told IV conversion circuit the transmission bandwidth of superelevation, low distortion can believe the low current from photodetector
Number it is amplified to the voltage signal of millivolts up to a hundred (MV)；
Told gain amplifier not only has the gain bandwidth of superelevation, but also can carry out under the control of the controller flexibly
Change its gain amplification factor, signal can be controlled ideal and undistorted in remote and close-in measurement；
Told constant fraction discriminator circuit, the circuit are made of multiple subsystems, with tradition at the time of/high pass discriminator circuit phase
Than, its main feature is that the signal after constant proportion can suppress the decaying of different objects reflection signal, the authenticity of signal can be more greatly promoted,
To the accuracy of the raising measurement accuracy of bigger.The signal that gain amplifying circuit is exported carries out constant proportion shaping, and detaches
Go out pulse laser jet lag and Echo width.
Time difference measurement circuit mainly measures jet lag and Echo width from moment discrimination circuit, and will measure
To controller, time difference measurement circuit is mainly characterized by measurement accuracy and is up to 10ps data transmission, and when can measure flight simultaneously
Difference and Echo width, to not influence pendulous frequency per second.
Implementation column 2
On the basis of implementation column 1, it is described further in conjunction with attached drawing 2- attached drawings 6：
High-voltage generating unit includes that high-voltage generating unit includes high-pressure generating circuit and filter circuit；High-pressure generating circuit packet
Chip U1 is included, chip U1 is the enhanced high-voltage MOS pipe of N-channel, and 1 foot of the model ZVN4525 of chip U1, chip U1 are MOS
The drain electrode of pipe first foot, 5 feet are the drain electrode of metal-oxide-semiconductor second, 6 feet are that metal-oxide-semiconductor third drains and 2 be that metal-oxide-semiconductor the 4th drains, chip U1
1 foot be connected with inductance L1, the other end of inductance L1 connects fusing resistor B1, and the other end of fusing resistor B1 connects 5V power supplys,
5V power supplys are also associated with capacitance C1, and the other end of capacitance C1 connects AC ground ACGND, the 3 foot series electrical of grid of chip U1
AC ground ACGND is connected after hindering R2；4 foot of source electrode of chip U1 connects AC ground ACGND, the 6 feet connection of chip U1
It is connected with capacitance C2, AC ground ACGND is connected after the other end series resistance R1 of capacitance C2；The 6 foot conducts of chip U1
High-pressure generating circuit output end；The drain electrode of metal-oxide-semiconductor first foot, the drain electrode of metal-oxide-semiconductor second foot, metal-oxide-semiconductor third drain electrode foot and metal-oxide-semiconductor the 4th
Drain foot connection；
Filter circuit include capacitance C3, capacitance C3 one end be connected with capacitance C4 and resistance R3, capacitance C3 and capacitance
The other end of C4 connects AC ground ACGND, and the other end of resistance R3 is connected with capacitance C5 and resistance R4, and capacitance C5's is another
One end connects AC ground ACGND；Output end of the other end of resistance R4 as high-voltage generating unit；Capacitance C3 is as filter
The input terminal of wave circuit；
Switching diode D1 is connected between filter circuit and high-pressure generating circuit, the anode of switching diode D1 connects core
6 feet of piece U1；Diode D1 cathodes connect the input terminal of filter circuit, and diode D1 cathodes are as voltage detecting end.
Chip U1 is high-voltage MOS pipe, and feature has the features such as conducting resistance is small, and turn-on time is fast, high voltage.
Inductance L1 is used for power mask inductance, its main feature is that electric current cannot be mutated for energy storage；
Capacitance C2 and resistance R1 generates boosting energy storage effect；
Capacitance C3 and capacitance C4 is storage capacitor；
Resistance R3 and R4 and capacitance C5 is for filtering out Switching Power Supply ripple；
Resistance R2 pull down resistors, for stablizing input current signal；
Further, high pressure checks that circuit includes chip U2, and chip U2 selects LMV321,1 foot of positive input foot of chip U2
It is connected with resistance R5, resistance R6 and capacitance C7, the other end of resistance R5 checks the input terminal of circuit, resistance R6 and electricity as high pressure
Hold the other end ground connection of C7,3 foot of negative input of chip U2 is connect with 4 foot of amplified signal output pin of chip U2 and conduct
High pressure checks the output end of circuit.Chip U2 is voltage follower, is driven for strengthening electric current；Resistance R5 and R6 are for dividing
Resistance, by the high pressure drop of output as low as 3.3V within；Capacitance C7 and C8 are used to filter out the clutter on power supply.
Further, temperature sensing circuit includes sensor U3.Sensor U3 is temperature sensors of high precision, model
MCP9700 voltage temperature sensors, 3 feet export for temperature analog signal, and 4 feet are power supply VCC, and 2 feet are power ground；Sensor U3
There is low-power consumption, high-precision, the characteristics of wide temperature range.
Further, I/V conversion circuits include chip IC 1, and 2 foot of input terminal of chip IC 1 connects S1, the electricity of chip IC 1
1 foot of source is connected with inductance B0 and capacitance CU2,8 foot of ground terminal of chip IC 1 and 5 feet ground connection, the first output end 7 of chip IC 1
Foot is connected with inductance L3, and 6 foot of second output terminal of chip IC 1 is connected with the other end series connection of inductance L2, inductance L3 and inductance L2
There is a capacitance RX, the output end of the both ends of capacitance RX as I/V conversion circuits.Further, gain amplifying circuit selects chip IC 2
Model AD8330.Select AD8330 as signal gain amplifier, AD8330 circuits have the ultra high bandwidth gain of 150M,
Its input and output, more can spurious clutter in filtering circuit system all by the way of difference.Chip IC 1 is preamplifier
MAX3665,1 foot are power supply VCC, and 2 feet are current signal output end, and 6 feet and 7 feet are respectively differential signal outputs.It is wherein electric
Feel B0 and capacitance CU1 integrated drive generator filter circuits, filters out the ripple interference of Power supply belt；Inductance L3, L2 and capacitance RX are combined into
The differential voltage signal of IC1 outputs is carried out LC filtering, preferably to obtain useful signal by LC filter networks.
The current signal that APD units export is converted into voltage signal by I/V conversion circuits, and is amplified, difference output；
Output signal from AD8330 passes through delay circuit, signal is accurate to ps ranks, high-precision is delayed, same with this
When the output signal from AD8330 pass through signal attenuation circuit, its signal is suitably decayed, finally with delay circuit into
Row signal compares shaping output.
Finally illustrate, above example is merely intended for describing the technical solutions of the present application, but not for limiting the present application, although ginseng
The utility model is described in detail according to preferred embodiment, it will be understood by those of ordinary skill in the art that, it can be to this
The technical solution of utility model is modified or replaced equivalently, without departing from the objective and model of technical solutions of the utility model
It encloses, should all cover in the right of the utility model.
Claims (7)
1. pulse type laser ranging receiving circuit, which is characterized in that including master controller, master controller is connected with high pressure and list occurs
Member, high-voltage detecting circuit, temperature sensing circuit, digital filter circuit and time difference measurement circuit, the output end of high-voltage generating unit
APD units are connected, the output end of APD units is connected with I/V conversion circuits, gain amplifying circuit and constant fraction discriminator circuit in turn；
The output end of constant fraction discriminator circuit connects digital filter circuit；Digital filter circuit connects time difference measurement circuit, and high pressure occurs single
Member connection high-pressure generating circuit；
The temperature sensing circuit：By the operating ambient temperature real-time Transmission of APD units to master controller；
The APD units：For detecting the reflected laser signals being projected on object and to convert optical signals into current signal defeated
Go out；
The I/V conversion circuits：The current signal that APD units export is converted into voltage signal；
The gain amplifying circuit：For voltage signal to be carried out voltage amplification；
The constant fraction discriminator circuit：Amplified signal is compared Ratio invariableness and shaping.
2. pulse type laser ranging receiving circuit as described in claim 1, which is characterized in that high-voltage generating unit includes high pressure
Circuit and filter circuit occurs；High-pressure generating circuit includes chip U1, and chip U1 is the enhanced high-voltage MOS pipe of N-channel, chip U1
Model ZVN4525,1 foot of chip U1 be metal-oxide-semiconductor first drain foot, 5 feet be the drain electrode of metal-oxide-semiconductor second, 6 feet are metal-oxide-semiconductor the
It three drain electrodes and 2 drains for metal-oxide-semiconductor the 4th, 1 foot of chip U1 is connected with inductance L1, and the other end of inductance L1 connects fusing resistor
The other end of B1, fusing resistor B1 connect 5V power supplys, and 5V power supplys are also associated with capacitance C1, and the other end connection exchange of capacitance C1 connects
AC ground ACGND is connected after the 3 foot series resistance R2 of grid of ground terminal ACGND, chip U1；4 foot of source electrode of chip U1 connects
6 feet of AC ground ACGND, chip U1 are connected with capacitance C2, are connected after the other end series resistance R1 of capacitance C2
AC ground ACGND；6 feet of chip U1 are as high-pressure generating circuit output end；The drain electrode of metal-oxide-semiconductor first foot, metal-oxide-semiconductor second leak
Pole foot, metal-oxide-semiconductor third drain electrode foot and the drain electrode foot of metal-oxide-semiconductor the 4th are connected to；
Filter circuit include capacitance C3, capacitance C3 one end be connected with capacitance C4 and resistance R3, capacitance C3 and capacitance C4's is another
The other end of end connection AC ground ACGND, resistance R3 are connected with capacitance C5 and resistance R4, and the other end connection of capacitance C5 is handed over
Flow ground terminal ACGND；Output end of the other end of resistance R4 as high-voltage generating unit；Inputs of the capacitance C3 as filter circuit
End；
Switching diode D1, the anode connection chip U1 of switching diode D1 are connected between filter circuit and high-pressure generating circuit
6 feet；Diode D1 cathodes connect the input terminal of filter circuit, and diode D1 cathodes are as voltage detecting end.
3. pulse type laser ranging receiving circuit as described in claim 1, which is characterized in that high pressure checks that circuit includes chip
U2, chip U2 select LMV321,1 foot of positive input foot of chip U2 to be connected with resistance R5, resistance R6 and capacitance C7, and resistance R5's is another
One end checks the input terminal of circuit, the other end ground connection of resistance R6 and capacitance C7,3 foot of negative input of chip U2 as high pressure
The output end of circuit is connect and checked as high pressure with 4 foot of amplified signal output pin of chip U2.
4. pulse type laser ranging receiving circuit as described in claim 1, which is characterized in that temperature sensing circuit includes sensing
Device U3, model MCP9700.
5. pulse type laser ranging receiving circuit as described in claim 1, which is characterized in that I/V conversion circuits include chip
1 foot of power end of IC1,1 model MAX3665 of chip IC, chip IC 1 are connected with inductance B0 and capacitance CU2, and chip IC 1 connects
7 foot of the first output end of 8 foot of ground terminal and 5 feet ground connection, chip IC 1 is connected with inductance L3, and 6 foot of second output terminal of chip IC 1 connects
The other end for being connected to inductance L2, inductance L3 and inductance L2 is in series with capacitance RX, and the both ends of capacitance RX are as the defeated of I/V conversion circuits
Outlet；
2 foot of input terminal of chip IC 1 connects APD units, and APD units include S1, and S1 is that APD is managed or PIN pipes, 2 feet of S1 are
The photosignal output end of S1 is used as input terminal after the 1 foot series resistance RS of benchmark high voltage input terminal of S1；The benchmark high pressure of S1 is defeated
Enter 1 foot of end and is also associated with capacitance CU1.
6. pulse type laser ranging receiving circuit as described in claim 1, which is characterized in that gain amplifying circuit includes chip
The model AD8330 of IC2, IC2.
7. pulse type laser ranging receiving circuit as described in claim 1, which is characterized in that constant fraction discriminator circuit includes delay
Circuit, signal attenuation circuit and signal transformation circuit；The output end connection signal shaping electricity of delay circuit and signal attenuation circuit
Road, the output end of the output end of signal transformation circuit as constant fraction discriminator circuit；The input of delay circuit and signal attenuation circuit
Hold the input terminal as constant fraction discriminator circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820135942.4U CN207799065U (en) | 2018-01-26 | 2018-01-26 | Pulse type laser ranging receiving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820135942.4U CN207799065U (en) | 2018-01-26 | 2018-01-26 | Pulse type laser ranging receiving circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207799065U true CN207799065U (en) | 2018-08-31 |
Family
ID=63270600
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820135942.4U Active CN207799065U (en) | 2018-01-26 | 2018-01-26 | Pulse type laser ranging receiving circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207799065U (en) |
-
2018
- 2018-01-26 CN CN201820135942.4U patent/CN207799065U/en active Active
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20190528 Address after: Floor 2, Building 13, 27 Xinjinqiao Road, China (Shanghai) Free Trade Pilot Area, Shanghai, 200120 Patentee after: Shanghai Qing Long Technology Co. Ltd. Address before: 610000 Chengdu City, Sichuan Province, Wuhou District, Wuhou Avenue, Tiefu Section 1 Building 1 Unit 14 Layer 1408 Patentee before: Chengdu micro cloud Technology Co., Ltd. |
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| TR01 | Transfer of patent right |