CN208999563U - A kind of laser radar APD temperature compensation system - Google Patents
A kind of laser radar APD temperature compensation system Download PDFInfo
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- CN208999563U CN208999563U CN201821610812.8U CN201821610812U CN208999563U CN 208999563 U CN208999563 U CN 208999563U CN 201821610812 U CN201821610812 U CN 201821610812U CN 208999563 U CN208999563 U CN 208999563U
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Abstract
This application involves laser radar fields, a kind of laser radar APD temperature compensation system includes: processor, temperature collecting module, boost module, voltage feedback module, the processor is connect with each functional module, and the data for passing back to each functional module are handled；Data for real-time measurement APD temperature and are issued processor by the temperature collecting module；The boost module is for receiving processor instruction, the boost in voltage that power supply is provided；The voltage feedback module is also connect with boost module, for measuring APD real-time voltage and data being issued processor；Real-time voltage compared with the theoretical voltage prestored, is adjusted output pwm signal by the processor in real time, controls the duty ratio of boost module, and then control the real-time voltage of APD.For the application by circuit design, solution is of the existing technology at high cost, takes up an area greatly, adjusts the inaccurate problem of voltage, has the advantages of at low cost, peripheral circuit is simple, digitizes adjusting.
Description
Technical field
This application involves field of artificial intelligence more particularly to a kind of laser radar APD temperature compensation systems.
Background technique
Avalanche photo diode (APD) is a kind of light detection diode of p-n junction type, is applied in laser pick-off circuit
When, APD avalanche multiplication effect of carrier under breakdown voltage is utilized and carrys out gain, amplify photosignal to improve the spirit of detection
Sensitivity.The variation of environment temperature influences the characteristic of APD very big in practical application, when the temperature increases, the breakdown voltage of APD
Also with rising, if the operating voltage (i.e. high pressure) of APD is constant, the Photoelectric Detection performance of APD can die down, sensitivity decrease.
If operating voltage allows for changing it is required that APD works in constant gain, caused with compensation because of temperature and manufacturing process
Avalanche gain variation.The application of APD is usually along with the compensation for being directed to variation of ambient temperature thus.
Well known laser radar APD temperature-compensating mostly uses greatly thermistor, is fed back with thermistor as APD power supply
Resistance, to allow APD supply voltage to generate variation with temperature.This circuit needs dedicated booster power chip, and
High output boost chip suitable for laser range sensor mostly uses greatly external metal-oxide-semiconductor, with high costs and occupancy circuit board
Area is very big.
Furthermore the temperature curve for being limited to thermistor might not can perfectly match the temperature curve of APD very much, when
When temperature change, voltage needed for avalanche photodide APD is in substantially linear variation with temperature together, and thermistor
Temperature characterisitic be it is nonlinear, high temperature section variation is fast, and low-temperature zone variation is slow, and the circuit built using thermistor can only make
The equivalent resistance of circuit is as the variation of temperature is close to linear variation, rather than linear change, exists between two curves and misses
Difference, so this kind of circuit often does certain compromise to performance.It is all and when replacing the APD of different temperatures curve
Circuit parameter must redesign.
Utility model content
The purpose of the embodiment of the present application is to propose a set of laser radar APD temperature compensation system, cooperation master cpu/MCU
Digital solution, solve of the existing technology at high cost, land occupation is big, adjusts the inaccurate problem of voltage, this laser
Radar cost is low, peripheral circuit is simple, and digitlization is adjusted, and adjustable range is wide.
For this purpose, the application uses following technical scheme:
On the one hand, a kind of laser radar APD temperature compensation system, comprising: processor, temperature collecting module, boost module,
Voltage feedback module,
The processor is connect with each functional module, and the data for passing back to each functional module are handled；
Data for real-time measurement APD temperature and are issued processor by the temperature collecting module；
The boost module is for receiving processor instruction, the boost in voltage that power supply is provided；
The voltage feedback module is also connect with boost module, for measuring APD real-time voltage and data being issued processing
Device；
The processor is by APD real time temperature, ratio and the temperature prestored of real-time voltage, compared with voltage ratio, in real time
Output pwm signal is adjusted, controls the duty ratio of boost module, and then control the real-time voltage of APD.
In a possible implementation, the boost module includes metal-oxide-semiconductor, inductance coil, diode, ground connection electricity
Hold, described inductance coil one end external input power, the other end connect with diode, the external APD of diode, in inductance coil and
It is equipped with first node between diode, is connected with metal-oxide-semiconductor, metal-oxide-semiconductor one end is connect with processor, other end ground connection, in diode
It is provided with second node between APD, is connected with voltage feedback module, third node is provided between second node and APD,
It is connected with ground capacity.
In a possible implementation, connected to the processor is additionally provided between the metal-oxide-semiconductor and processor
One resistance R1, processor, first resistor R1, metal-oxide-semiconductor form pwm circuit.
In a possible implementation, the temperature collecting module is the temperature sensor or external built in processor
Temperature sensor or external thermistor.
In a possible implementation, the voltage feedback module includes concatenated second resistance R2 and 3rd resistor
R3 is connect by fourth node with processor between the second resistance R2 and 3rd resistor R3, the 3rd resistor R3 ground connection.
In a possible implementation, 20R3≤R2≤200R3.
In a possible implementation, R2=100R3.
In a possible implementation, a kind of temperature-compensation method of laser radar APD, the above-mentioned technical side of the right to use
Any laser radar APD temperature compensation system of case, includes the following steps:
A, it acquires the temperature of APD in real time by temperature collecting module, and real time temperature is issued into processor；
B, it acquires the voltage of APD in real time by voltage feedback module, and real-time voltage is issued into processor；
C, the processor prestores APD in the corresponding APD theoretical voltage value Vn of different temperatures, by Vt and real time temperature Tt
Corresponding Vn compares, and as Vt < Vn-M, forward direction adjustment PWM drives duty ratio；As Vt-M≤Vn≤Vt+M, PWM driving is kept
Duty ratio is constant；As Kt > Kn+M, the reversed PWM that adjusts drives duty ratio.
In a possible implementation, the M is 0.6V-2V.
In a possible implementation, the M is 1.2V.
The embodiment of the present application overcomes the deficiencies in the prior art, avoid because thermistor and APD temperature curve not
Match and sacrifice partial properties, can make APD work in optimum state in entire operating temperature range.
Wide adaptation range, as the APD more renewed, it is only necessary to the room temperature voltage and temperature of the new APD of typing in software
Coefficient can match new APD, and circuit does not need to do any variation.
Detailed description of the invention
Fig. 1 is the module diagram for the laser radar temperature compensation system that the embodiment of the present application 1 provides.
Fig. 2 is the circuit diagram for the laser radar compensation system that the embodiment of the present application 1 provides.
In figure: 1, processor；2, temperature collecting module；3, boost module；4, voltage feedback module；5,APD；6, field-effect
Pipe.
Specific embodiment
Further illustrate the technical solution of the application below with reference to the accompanying drawings and specific embodiments.
It should be noted that in the absence of conflict, the features in the embodiments and the embodiments of the present application can phase
Mutually combination.The application is described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.
In order to make those skilled in the art more fully understand application scheme, below in conjunction in the embodiment of the present application
Attached drawing, the technical scheme in the embodiment of the application is clearly and completely described, it is clear that described embodiment is only
The embodiment of the application a part, instead of all the embodiments.Based on the embodiment in the application, ordinary skill people
Member's every other embodiment obtained without making creative work, all should belong to the model of the application protection
It encloses.
It should be noted that the description and claims of this application and term " first " in above-mentioned attached drawing, "
Two " etc. be to be used to distinguish similar objects, without being used to describe a particular order or precedence order.It should be understood that using in this way
Data be interchangeable under appropriate circumstances, so as to embodiments herein described herein.In addition, term " includes " and " tool
Have " and their any deformation, it is intended that cover it is non-exclusive include, for example, containing a series of steps or units
Process, method, system, product or equipment those of are not necessarily limited to be clearly listed step or unit, but may include without clear
Other step or units listing to Chu or intrinsic for these process, methods, product or equipment.
As shown in Figure 1, a kind of laser radar APD temperature compensation system, comprising: processor 1, temperature collecting module 2, boosting
Module 3, voltage feedback module 4.
The processor 1 is connect with each functional module, and the data for passing back to each functional module are handled；Processor
Select CPU, MCU.
Data for real-time measurement APD temperature and are issued processor 1 by the temperature collecting module 2；Temperature collecting module 2
It can be external temperature sensor, thermistor, or the temperature sensor 2 built in processor.Built-in temperature sensing
Volume is smaller in the case where device 2.
The boost module 3 is for receiving processor instruction, the boost in voltage that power supply is provided；
The voltage feedback module 4 is also connect with boost module 3, for measuring APD real-time voltage and data being issued place
Manage device；
Real-time voltage compared with the theoretical voltage prestored, is adjusted output pwm signal by the processor 1 in real time, and control rises
The duty ratio of die block, and then control the real-time voltage of APD.Specifically, the processor 1 prestores APD in different temperatures
Corresponding APD theoretical voltage value Vn, by real-time voltage Vt Vn corresponding with real time temperature Tt compared with, it is positive as Vt < Vn-M
It adjusts PWM and drives duty ratio；As Vt-M≤Vn≤Vt+M, keep PWM driving duty ratio constant；It is reversed to adjust as Kt > Kn+M
Whole PWM drives duty ratio.
As shown in Fig. 2, further, the boost module 3 includes metal-oxide-semiconductor Q6, inductance coil L, diode D, ground connection electricity
Hold C, the one end inductance coil L external input power, the other end is connect with diode D, the external APD5 of diode D, in inductance
It is equipped with first node between coil L and diode D, is connected with metal-oxide-semiconductor Q6, the one end metal-oxide-semiconductor Q6 is connect with processor 1, the other end
Ground connection, is provided with second node between diode D and APD, voltage feedback module 4 is connected with, between second node and APD
It is provided with third node, is connected with ground capacity C.
Further, it is additionally provided with first resistor R1 connected to the processor between the metal-oxide-semiconductor 6 and processor, handles
Device, first resistor R1, metal-oxide-semiconductor form pwm circuit.
3 working principle of boost module is that processor 1 issues pwm control signal, and control metal-oxide-semiconductor Q6 is opened and disconnected, and works as MOS
When pipe Q6 is in opening state, input power to circuit input voltage, input voltage by inductance coil L, to inductance coil L into
Row charging, inductance coil L electric current rise, and diode D reversely ends at this time, for preventing ground capacity C from discharging over the ground；Work as MOS
When pipe Q is in an off state, diode D forward conduction, inductance coil L charges plus power supply to ground capacity C, to ground connection
The voltage that capacitor is applied with inductance coil L adds the voltage of power supply, and ground capacity C both end voltage increases, and completion was boosted
Journey.
Further, the voltage feedback module 4 includes concatenated second resistance R2 and 3rd resistor R3, second electricity
It is connect by third node with processor between resistance R2 and 3rd resistor R3, the 3rd resistor R3 ground connection.
Voltage feedback module working principle: the ADC conversion connection built in 4 one end of voltage feedback module and processor 1, it is another
End is connected to second node, for measuring ground capacity C, while being also the real-time voltage of APD.Second resistance R2,3rd resistor
R3 forms a bleeder circuit, so that the voltage that processor is connected to end with voltage feedback module is.It is anti-
Only because of the excessive damage processor 1 of APD real-time voltage.
Further, 20R3≤R2≤200R3.
Further, R2=100R3.
If R2 is less than 20R3, partial pressure effect is not had, R2 is greater than 200R3, and the voltage after partial pressure is too small, and processor 1 detects
Less than.
The present embodiment laser radar APD temperature compensation system structure is simple, is all conventional components using element, at low cost
Honest and clean, debugging is simple, is beneficial to produce in enormous quantities.
In the present embodiment processor in the case where integrated temperature sensor and converter, small volume.
A kind of temperature-compensation method of laser radar APD, using laser radar APD temperature compensation system, including walks as follows
It is rapid:
A, it acquires the temperature of APD in real time by temperature collecting module, and real time temperature Tt is issued into processor；
B, it acquires the voltage of APD in real time by voltage feedback module, and real-time voltage Vt is issued into processor；
C, the processor prestores APD in the corresponding APD theoretical voltage value Vn of different temperatures, by Vt and real time temperature Tt
Corresponding Vn compares, and as Vt < Vn-M, forward direction adjustment PWM drives duty ratio；As Vt-M≤Vn≤Vt+M, PWM driving is kept
Duty ratio is constant；As Kt > Kn+M, the reversed PWM that adjusts drives duty ratio.
M value is big, inaccurate to the adjusting of real-time voltage, but regulating time is shorter, and it is low to adjust difficulty；M value is small, to real-time
The adjusting of voltage is more accurate, but regulating time is longer, and it is big to adjust difficulty.
Further, the M is 0.6V-2V.
Further, the M is 1.2V.
Meets the needs of to precision and regulating time simultaneously in this way.
Describe the technical principle of the application in conjunction with specific embodiments above.These descriptions are intended merely to explain the application's
Principle, and it cannot be construed to the limitation to the application protection scope in any way.Based on the explanation herein, the technology of this field
Personnel do not need to pay for creative labor the other specific embodiments that can associate the application, these modes are fallen within
Within the protection scope of the application.
Claims (7)
1. a kind of laser radar APD temperature compensation system characterized by comprising processor, temperature collecting module, boosting mould
Block and voltage feedback module,
The processor is connect with each functional module, and the data for passing back to each functional module are handled；
Data for real-time measurement APD temperature and are issued processor by the temperature collecting module；
The boost module is for receiving processor instruction, the boost in voltage that power supply is provided；
The voltage feedback module is also connect with boost module, for measuring APD real-time voltage and data being issued processor；
Real-time voltage compared with the theoretical voltage prestored, is adjusted output pwm signal by the processor in real time, controls boost module
Duty ratio, and then control APD real-time voltage.
2. laser radar APD temperature compensation system according to claim 1, which is characterized in that the boost module includes
Metal-oxide-semiconductor, inductance coil, diode and ground capacity, described inductance coil one end external input power, the other end and diode connect
It connects, the external APD of diode, first node is equipped between inductance coil and diode, be connected with metal-oxide-semiconductor, metal-oxide-semiconductor one end and place
Device connection is managed, other end ground connection is provided with second node between diode and APD, voltage feedback module is connected with, second
It is provided with third node between node and APD, is connected with ground capacity.
3. laser radar APD temperature compensation system according to claim 2, which is characterized in that the metal-oxide-semiconductor and processor
Between be additionally provided with first resistor R1 connected to the processor, processor, first resistor R1, metal-oxide-semiconductor form pwm circuit.
4. laser radar APD temperature compensation system according to claim 1, which is characterized in that the temperature collecting module
For the temperature sensor or external temperature sensor or external thermistor built in processor.
5. laser radar APD temperature compensation system according to claim 1, which is characterized in that the voltage feedback module
Including concatenated second resistance R2 and 3rd resistor R3, between the second resistance R2 and 3rd resistor R3 by fourth node with
Processor connection, the 3rd resistor R3 ground connection.
6. laser radar APD temperature compensation system according to claim 5, which is characterized in that 20R3≤R2≤200R3.
7. laser radar APD temperature compensation system according to claim 6, which is characterized in that R2=100R3.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201821610812.8U CN208999563U (en) | 2018-09-30 | 2018-09-30 | A kind of laser radar APD temperature compensation system |
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| CN201821610812.8U CN208999563U (en) | 2018-09-30 | 2018-09-30 | A kind of laser radar APD temperature compensation system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111007479A (en) * | 2019-11-27 | 2020-04-14 | 广东博智林机器人有限公司 | Laser radar detection system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111007479A (en) * | 2019-11-27 | 2020-04-14 | 广东博智林机器人有限公司 | Laser radar detection system |
| CN111007479B (en) * | 2019-11-27 | 2022-01-04 | 广东博智林机器人有限公司 | Laser radar detection system |
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