CN211743675U - Multi-path pulse control laser emission circuit - Google Patents
Multi-path pulse control laser emission circuit Download PDFInfo
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- CN211743675U CN211743675U CN202020765342.3U CN202020765342U CN211743675U CN 211743675 U CN211743675 U CN 211743675U CN 202020765342 U CN202020765342 U CN 202020765342U CN 211743675 U CN211743675 U CN 211743675U
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Abstract
The utility model discloses a multichannel pulse control laser emission circuit, including input channel, drive circuit, negative feedback control loop, laser pipe and compensating circuit, input channel connects drive circuit, and drive circuit still connects the laser pipe, and negative feedback control loop is connected with the reference channel, and drive circuit is still connected to negative feedback control loop, drive circuit still connects compensating circuit, the utility model discloses a set up external pin resistance and can realize managing automatic current control circuit (ACC) or automatic power control circuit (APC) to the laser, relative prior art main drive circuit supports single drive mode, and this circuit mode only need just can accomplish the switching of two kinds of modes through the modification to through hardware compensating circuit, make laser possess better versatility.
Description
Technical Field
The utility model relates to a laser control field specifically is a multichannel pulse control laser emission circuit.
Background
At present, a laser detector adopts laser as a detection light source, and the laser has better brightness and directivity compared with a common light source due to strong emission capability and high concentration of energy. Coherence is the common property of all waves, but the coherence of various light waves is divided into high and low parts due to different qualities of the light waves. Laser light is different from a common light source, is stimulated radiation light, and has extremely strong coherence. Therefore, the laser is popularized and used in the field of security detection. However, the laser has a certain service life, and under the condition of long-term operation, the laser power is attenuated, and the annual attenuation rate is about 3%. The laser has serious performance attenuation after working for 3-5 years, which causes the equipment to be incapable of normally operating, solves the problem of laser attenuation and ensures the long-term fault-free operation of the laser.
In the design of the laser driving circuit, an operational amplifier circuit is mainly adopted. The circuit is mainly pulse-driven, an impedance matching resistor is adopted to connect a pulse control signal into a modulation signal for modulating the drive of a laser, and the on-off control is realized through a subsequent comparator and a drive circuit. The special power supply IC provides basic voltage for driving the laser, the voltage is maintained to be stable by the voltage stabilizing diode, and the setting of the reference voltage of the negative input end of the comparator is realized by adjusting the slide rheostat. The integrated operational amplifier is designed in the part, the pulse control circuit is compared with the reference voltage through the comparator, and the comparison signal is sent to the positive input end of a voltage follower formed by an amplifier in a subsequent integrated operational amplifier chip. The positive input end of the voltage follower is externally connected with a pull-up resistor of reference voltage, and the comparator outputs a switching signal to control the voltage of the positive input end of the voltage follower to realize a switching function so as to complete the subsequent starting and conducting of the field effect transistor and further realize the integral control of a pulse switching signal.
The conventional laser control circuit is easily subjected to temperature influence to generate temperature drift, and the current of the control circuit changes, so that the brightness of a laser diode is not constant, and the laser diode is easily aged.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a multichannel pulse control laser emission circuit to solve the problem that proposes among the above-mentioned background art.
In order to achieve the above object, the utility model provides a following technical scheme:
the utility model provides a multichannel pulse control laser emission circuit, includes input channel, drive circuit, negative feedback control loop, laser pipe and compensating circuit, input channel connects drive circuit, and drive circuit still connects the laser pipe, and negative feedback control loop is connected with the reference channel, and negative feedback control loop still connects drive circuit, drive circuit still connects compensating circuit.
As a further technical solution of the present invention: the front end of the input channel is connected with an MCU.
As a further technical solution of the present invention: the front end of the input channel is connected with 3-5V voltage.
As a further technical solution of the present invention: the reference channel is connected with the laser tube.
As a further technical solution of the present invention: the reference channel is connected with a ground resistor.
Compared with the prior art, the beneficial effects of the utility model are that: the utility model discloses a set up outside pin resistance and can realize managing automatic current control circuit (ACC) or automatic power control circuit (APC) to the laser, relative prior art main drive circuit supports single drive mode, and this circuit mode only need just can accomplish the switching of two kinds of modes through the modification to through hardware compensating circuit, make laser possess better general nature.
Drawings
FIG. 1 is a block diagram of example 1.
FIG. 2 is a block diagram of example 2.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1, embodiment 1: the utility model provides a multichannel pulse control laser emission circuit, includes input channel, drive circuit, negative feedback control loop, laser pipe and compensating circuit, input channel connects drive circuit, and drive circuit still connects the laser pipe, and negative feedback control loop is connected with the reference channel, and negative feedback control loop still connects drive circuit, drive circuit still connects compensating circuit. The front end of the input channel is connected with an MCU. The reference channel is connected with the laser tube.
In the APC mode, the current of the laser diode is detected by the feedback of the photodiode in the APC mode. The main working mode is to acquire a feedback signal of an FD pin of the laser tube through a reference channel, gain-amplify the signal through a negative feedback control loop and feed the signal back to a driving circuit, so that the automatic adjustment effect is achieved. Under the APC driving mode, the MCU can control the frequency change of the control signal to realize the control of the whole power of the laser tube.
Embodiment 2, as shown in fig. 2, a multi-channel pulse control laser emitting circuit includes an input channel, a driving circuit, a negative feedback control loop, a laser tube, and a compensation circuit, where the input channel is connected to the driving circuit, the driving circuit is further connected to the laser tube, the negative feedback control loop is connected to a reference channel, the negative feedback control loop is further connected to the driving circuit, and the driving circuit is further connected to the compensation circuit. The front end of the input channel is connected with 3-5V voltage. The reference channel is connected with a grounding resistor.
At the moment, the laser tube is in an ACC mode, 3-5V voltage is connected to an input channel in the ACC driving mode, and the reference channel enables the reference channel to acquire a quantitative voltage value through changing the resistance value of an external ground resistor, so that the passing current of the laser tube is always a stable fixed value, and the ACC automatic current control effect is achieved.
The maximum working current of the laser diode flowing through the driving circuit can be adjusted by the external resistor in both the ACC driving mode and the APC driving mode.
It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (5)
1. The utility model provides a multichannel pulse control laser emission circuit, includes input channel, drive circuit, negative feedback control loop, laser tube and compensating circuit, its characterized in that, input channel connects drive circuit, and drive circuit still connects the laser tube, and negative feedback control loop is connected with the reference channel, and negative feedback control loop still connects drive circuit, drive circuit still connects compensating circuit.
2. The multi-channel pulse control laser emission circuit according to claim 1, wherein the front end of the input channel is connected with an MCU.
3. The multi-channel pulse-controlled laser transmitter circuit as claimed in claim 1, wherein the front end of the input channel is connected to a voltage of 3-5V.
4. The multi-channel pulse-controlled laser transmitter circuit as claimed in claim 2, wherein said reference channel is connected to a laser tube.
5. The multi-channel pulse-controlled laser transmitter circuit as claimed in claim 3, wherein said reference channel is connected to a ground resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020765342.3U CN211743675U (en) | 2020-05-11 | 2020-05-11 | Multi-path pulse control laser emission circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020765342.3U CN211743675U (en) | 2020-05-11 | 2020-05-11 | Multi-path pulse control laser emission circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211743675U true CN211743675U (en) | 2020-10-23 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020765342.3U Active CN211743675U (en) | 2020-05-11 | 2020-05-11 | Multi-path pulse control laser emission circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211743675U (en) |
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2020
- 2020-05-11 CN CN202020765342.3U patent/CN211743675U/en active Active
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