CN214204260U - Pulse laser driving circuit system - Google Patents
Pulse laser driving circuit system Download PDFInfo
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- CN214204260U CN214204260U CN202120357330.1U CN202120357330U CN214204260U CN 214204260 U CN214204260 U CN 214204260U CN 202120357330 U CN202120357330 U CN 202120357330U CN 214204260 U CN214204260 U CN 214204260U
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Abstract
The utility model provides a pulse laser drive circuit system, including power, energy storage capacitor, resistance, the inductance that discharges, high speed switch and laser instrument, energy storage capacitor, the inductance that discharges, high speed switch and laser instrument establish ties and constitute discharge circuit, and energy storage capacitor, resistance and power are established ties and are constituted charging circuit, and the oscillating inductance of establishing ties becomes RLC oscillating circuit with charging circuit in charging circuit, makes energy storage capacitor's charging voltage be higher than the voltage of power through the oscillation mode. Compared with the existing power supply system, the utility model discloses only need to introduce the oscillating inductance at drive circuit's the part that charges, can make the driving voltage of laser instrument double, the cost is very cheap, and the stable performance for whole laser radar system does not increase weight almost, nevertheless can reduce nearly half with the laser instrument to mains voltage's demand, has reduced power supply system's cost and complexity in the very big degree.
Description
Technical Field
The utility model relates to a laser radar technical field, in particular to pulse laser drive circuit system.
Background
With the continuous development of laser technology, lasers are widely applied in the field of laser radars (lidar). The remote sensing method for measuring the target distance by utilizing the laser beam has wide application prospect in the fields of military affairs, scientific research, civil use and the like. In particular, laser radar is widely used in vehicle driving assistance systems as an important sensor of remote sensing systems.
The most widely used ranging method is the pulse time of flight (TOF) method. The TOF ranging method is a two-way ranging technique that measures the distance to a target using the round-trip time of a transmitted signal from a transmitter to a receiver. The width of a pulse signal emitted by the laser is as narrow as possible, so that higher detection precision is realized; the peak power of the pulse signal is as large as possible, thereby achieving a longer detection distance. This puts high demands on the design of the laser driver circuit.
At present, the most common pulse laser driving circuit is shown in fig. 1, in which a power supply, a resistor and an energy storage capacitor form a charging part of the driving circuit, and the energy storage capacitor, a high-speed switch, a discharging inductor and a laser form a discharging part of the driving circuit. When the high-speed switch is switched off, the power supply charges the energy storage capacitor, and when the switch is switched on, the charges stored in the energy storage capacitor are completely released to drive the laser to generate pulse laser. The pulse signal source controls the high-speed switch to be periodically switched on and switched off, and the laser emits periodic high-power narrow pulses. However, the laser has a high requirement on the driving voltage, and usually needs a power supply of tens of volts or even hundreds of volts, which results in a complex and heavy power supply system, not only increases the cost, but also reduces the portability of the laser radar.
SUMMERY OF THE UTILITY MODEL
The power supply system to current pulse laser radar has complicated heaviness, problem with high costs, the utility model provides a new pulse laser drive circuit system can make the drive voltage of laser instrument double.
In order to achieve the above purpose, the utility model adopts the following specific technical scheme:
the utility model provides a pulse laser drive circuit system, including power, energy storage electric capacity, resistance, discharge inductance, high speed switch and laser instrument, energy storage electric capacity, high speed switch, discharge inductance and laser instrument establish ties and constitute discharge circuit, and energy storage electric capacity, resistance and power are established ties and are constituted charging circuit, and the oscillating inductance of establishing ties in charging circuit becomes RLC oscillating circuit with charging circuit, makes energy storage electric capacity's charging voltage be higher than the voltage of power through the oscillation mode.
Compared with the existing power supply system, the utility model discloses only need to introduce the oscillating inductance at drive circuit's the part that charges, can make the driving voltage of laser instrument double, the cost is very cheap, and the stable performance for whole laser radar system does not increase weight almost, nevertheless can reduce nearly half with the laser instrument to mains voltage's demand, has reduced power supply system's cost and complexity in the very big degree.
Drawings
FIG. 1 is a schematic diagram of a prior art pulsed laser drive circuit;
fig. 2 is a schematic diagram of a pulsed laser drive circuitry according to an embodiment of the present invention;
fig. 3 is an equivalent circuit diagram of a pulsed laser drive circuitry during charging according to an embodiment of the present invention;
fig. 4 is a graph of the simulation result of the laser current according to embodiment 1 of the present invention;
fig. 5 is a diagram of simulation results of laser current according to embodiment 2 of the present invention.
Wherein the reference numerals include: the laser comprises a power supply 1, an energy storage capacitor 2, a resistor 3, a high-speed switch 4, a laser 5, a discharge inductor 6 and an oscillation inductor 7.
Detailed Description
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the following description, the same reference numerals are used for the same blocks. In the case of the same reference numerals, their names and functions are also the same. Therefore, detailed description thereof will not be repeated.
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not constitute limitations on the invention.
As background art shows, the conventional pulse laser has a high requirement on the driving voltage, and many laser radar systems are difficult to meet the requirement on the driving voltage of the laser, which affects the maximum detection distance of the laser radar.
The research shows that although the pulse laser has high requirement on the driving voltage, the pulse laser does not need a constant high-voltage power supply, as long as the energy storage capacitor is charged to the required voltage before the energy storage capacitor is discharged every time, and the RLC oscillation circuit can generate the voltage higher than the power supply in an oscillation mode and has an inherent oscillation period, so that the RLC oscillation circuit is particularly suitable for the pulse laser driving circuit and provides the voltage higher than the power supply for the laser.
It is to this the utility model discloses doing this theory of experimental verification, introducing an oscillating inductance at drive circuit's the part that charges, making power, oscillating inductance, resistance and energy storage electric capacity constitute RLC oscillating circuit, the laser instrument is pulse laser diode, and electric capacity is 1nF, and the oscillating inductance is 10.1mH, and the power is 32V. Through tests, the power emitted by the 32V power supply driven laser after the oscillating inductor is introduced is completely equivalent to the power emitted by a 60V power supply driven laser of a traditional circuit, after the 32V power supply is changed into a 42V power supply, the power emitted by the driven laser is equivalent to the power emitted by an 80V power supply driven laser of the traditional circuit, and the driving voltage of the laser is improved by 88-90% by the RLC oscillating circuit and is close to the doubling effect. The requirement on the precision and the internal resistance of the oscillation inductor is low, the introduced oscillation inductor can be slightly larger than a theoretical calculated value, and the oscillation inductor with the voltage of 10 mH-20 mH is introduced into the circuit in the test, so that a good effect can be achieved. The internal resistance of the oscillating inductor used in the experiment is 20 omega, and the amplification effect of the RLC oscillating circuit on the power supply voltage is not influenced by the existence of the internal resistance.
The following describes the pulse laser driving circuit system provided by the embodiments of the present invention in detail with reference to the accompanying drawings.
Fig. 2 illustrates the principle of a pulsed laser driving circuitry according to an embodiment of the present invention.
As shown in fig. 2, an embodiment of the present invention provides a pulse laser driving circuit system, including: power 1, energy storage capacitor 2, resistance 3, high speed switch 4, laser instrument 5 and discharge inductance 6, power 1, energy storage capacitor 2 and resistance 3 establish ties and form charging circuit, energy storage capacitor 2, high speed switch 4, laser instrument 5 establishes ties with discharge inductance 6 and forms discharge circuit, when high speed switch 4 disconnection, charge energy storage capacitor 2 through power 1, when high speed switch 4 closed, energy storage capacitor 2 releases the electric charge of storage completely, drive laser instrument 5 produces pulsed laser.
The utility model discloses an innovation point lies in, introduces a vibration inductance 7 in charging circuit, establishes ties vibration inductance 7 in charging circuit, and vibration inductance 7, power 1, energy storage electric capacity 2 establish ties with resistance 3 to become RLC second order differential oscillating circuit with original charging circuit, according to differential oscillating circuit's principle characteristic, energy storage electric capacity 2 can obtain the voltage that is higher than power 1 in a period.
Because the RLC second-order differential oscillating circuit has a fixed oscillating period and the closing time of the high-speed switch 4 also has a fixed frequency period, the frequency period when the high-speed switch 4 is closed can be matched with the oscillating period of the RLC second-order differential oscillating circuit by calculating the inductance of the oscillating inductor 7, so that the charging voltage of the energy storage capacitor 2 just reaches the maximum value when the high-speed switch 4 is closed, and the laser 5 is driven.
Fig. 3 is an equivalent circuit of the pulse laser driving circuit system according to an embodiment of the present invention when charging.
As shown in fig. 3, when the high-speed switch 4 is turned off, the amplifying circuit is turned off, and the driving circuit is equivalent to an RLC second-order differential oscillating circuit, which has the following components according to kirchhoff's law:
U＝uL(t)+uR(t)+uC(t) (1)
uR(t)＝i(t)R (3)
formula (5) relates to uC(t) second order constant coefficient differential equation of
y＝uC(t) then the equation can be written as y "+ ay' + by ═ c. For this equation, a general solution Y of the homogeneous equation Y "+ ay ' + by ═ 0 is first solved, and then a specific solution Y of the inhomogeneous equation Y" + ay ' + by ═ c is solved, and Y + Y is a general solution of Y "+ ay ' + by ═ c.
Firstly, solving a homogeneous equationy "+ ay' + by ═ 0 general solution, and its characteristic equation is r2+ ar + b is 0, the characteristic root is
(for weakly damped oscillation circuits, a)2-4b < 0) to obtain
So the solution of the next equation y "+ ay' + by ═ 0 is:
One particular solution of the non-homogeneous equation y "+ ay' + by ═ c is
The general solution of the non-homogeneous equation y "+ ay' + by ═ c is:
When t is 0, the current in the circuit is zero and the voltage of the energy storage capacitor 2 is zero, depending on the initial conditions of the circuit, so that
uC(0) 0, can be determined according to this condition
Non homogeneous equation
The general solution of (A) is as follows:
It can be seen that uC(t) oscillation with time, uC(t) the first maximum point of oscillation is uC(t) maximum value.
Order to
The time of the first extreme point can be determined
Calculating corresponding L according to R, C and the time interval T value of two times of switch closure, and when the high-speed switch 4 is closed, u is exactlyC(t) at the highest point of oscillation, in this case
In fact
Therefore, it is not only easy to use
The driving voltage of the laser can be increased from U to 2U, and the effect of doubling the voltage is achieved.
That is, according to
The inductance of the oscillating inductor 7 is selected to ensure that u is exactly equal to u when the high-speed switch 4 is closed each timeC(t) at the highest point of oscillation.
In order to demonstrate the technical effects that the present invention can achieve, two specific embodiments are described below.
Detailed description of the preferred embodiment 1
Fig. 4 shows the simulation result of the laser current according to embodiment 1 of the present invention.
As shown in fig. 4, the three curves respectively correspond to the simulation results of the laser current of 30V power supply without inductance, 30V power supply with inductance, and 60V without inductance, where t is the simulation time and I is the laser current. It can be seen that under a 30V power supply, the peak current of the laser can be doubled by introducing a proper inductance, and the effect is equivalent to that of a laser driven by a 60V power supply.
Specific example 2
Fig. 5 shows a simulation result diagram of laser current according to embodiment 2 of the present invention.
As shown in fig. 5, similar simulation is performed by using a 40V power supply, and it can also be seen that, under the 40V power supply, the peak current of the laser can be doubled by introducing a suitable oscillating inductor, and the effect is equivalent to that of a laser driven by an 80V power supply. According to the simulation result, under different power supply voltages, the power supply voltage can be doubled by introducing proper oscillation inductance.
Compared with the existing driving circuit, the utility model discloses only introduce an oscillating inductance in charging circuit, the cost is very cheap, and the stable performance for whole laser radar system does not increase weight almost, nevertheless can reduce nearly half with the laser instrument to mains voltage's demand, has reduced power supply system's cost and complexity to a very big extent. Even for some existing circuits which cannot be modified after being formed, the problem can be solved by externally connecting a series inductor. The utility model provides an idea not only is limited to this experiment, and a lot of pulse laser's drive circuit all can improve through this kind of mode, probably has wide application prospect in the future.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the scope of the present invention.
The above detailed description of the present invention does not limit the scope of the present invention. Various other changes and modifications of the present invention should be covered by the appended claims.
Claims (1)
1. The utility model provides a pulse laser drive circuit system, includes power, energy storage capacitor, resistance, high speed switch, discharge inductance and laser instrument, energy storage capacitor high speed switch discharge inductance with the laser instrument establishes ties and constitutes discharge circuit, energy storage capacitor resistance with the power establishes ties and constitutes charging circuit, its characterized in that in series connection oscillating inductance in the charging circuit, will charging circuit becomes RLC oscillating circuit, makes through the oscillation mode energy storage capacitor's charging voltage is higher than the voltage of power.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120357330.1U CN214204260U (en) | 2021-02-07 | 2021-02-07 | Pulse laser driving circuit system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120357330.1U CN214204260U (en) | 2021-02-07 | 2021-02-07 | Pulse laser driving circuit system |
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| CN214204260U true CN214204260U (en) | 2021-09-14 |
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| CN202120357330.1U Active CN214204260U (en) | 2021-02-07 | 2021-02-07 | Pulse laser driving circuit system |
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2021
- 2021-02-07 CN CN202120357330.1U patent/CN214204260U/en active Active
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