CN212875046U - Laser driving circuit based on laser emitting system - Google Patents
Laser driving circuit based on laser emitting system Download PDFInfo
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- CN212875046U CN212875046U CN202021912563.5U CN202021912563U CN212875046U CN 212875046 U CN212875046 U CN 212875046U CN 202021912563 U CN202021912563 U CN 202021912563U CN 212875046 U CN212875046 U CN 212875046U
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Abstract
The utility model provides a laser drive circuit based on laser emission system, which adjusts the optical signal power output by the laser by adopting the analog mode to drive the laser, so that the output optical signal of the laser is stable; the negative feedback loop consisting of the laser, the photodiode, the pre-amplification circuit, the secondary amplification circuit and the current driving circuit is arranged to adjust the power of the optical signal output by the laser, so that when the output optical power of the laser diode LD is increased, the forward current of the laser diode LD in the laser is reduced, the output power is reduced, and the negative feedback effect is achieved; when the output light power of the laser diode LD is reduced, the forward current of the laser diode LD in the laser is increased, the output power is increased, and the positive feedback effect is achieved; through setting up reference voltage regulating circuit, on the one hand can be through adjusting its resistance value and then adjust output optical power's size, on the other hand, adjust secondary amplifier circuit's zero point position, can guarantee the zero point correction of output.
Description
Technical Field
The utility model relates to a laser emission system field especially relates to laser instrument drive circuit based on laser emission system.
Background
The laser emission system generally includes a laser driving circuit and a laser, and the laser driving circuit drives the laser to output a stable optical signal. The existing laser driving circuit generally adopts a numerical control mode, a numerical control circuit of the numerical control mode can generate great noise in the operation process, a special circuit is required for eliminating the noise, and the numerical control circuit and the denoising circuit are required, so that the circuit structure and the cost are greatly increased. Therefore, for solving the above problem, the utility model provides a laser instrument drive circuit based on laser emission system adopts analog mode drive laser instrument, adjusts the light signal power of laser instrument output for the laser instrument outputs light signal stability, and simplifies the structure of laser instrument.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides a laser instrument drive circuit based on laser emission system adopts the analog mode drive laser instrument, adjusts the optical signal power of laser instrument output for the laser instrument outputs optical signal stability, and simplifies the structure of laser instrument.
The technical scheme of the utility model is realized like this: the utility model provides a laser driving circuit based on a laser emission system, which comprises a laser and a photodiode, and further comprises a pre-amplification circuit, a secondary amplification circuit, a reference voltage regulating circuit and a current driving circuit;
the anode of the photodiode is grounded, the cathode of the photodiode is electrically connected with the first input end of the secondary amplifying circuit through the pre-amplifying circuit, the reference voltage regulating circuit is electrically connected with the second input end of the secondary amplifying circuit, the output end of the secondary amplifying circuit is electrically connected with the input end of the current driving circuit, and the output end of the current driving circuit is electrically connected with the laser.
On the basis of the above technical solution, preferably, the preamplifier circuit includes: an operational amplifier OPA2344, a resistor R35 and a capacitor C32;
the negative electrode of the photodiode is electrically connected to the pin 6 of the operational amplifier OPA2344, the resistor R35 is connected in parallel between the pin 6 and the pin 7 of the operational amplifier OPA2344, the capacitor C32 is connected in parallel across the resistor R32, and the pin 7 of the operational amplifier OPA2344 is electrically connected to the first input terminal of the secondary amplifying circuit.
On the basis of the above technical solution, preferably, the secondary amplification circuit includes: an operational amplifier OPA2344, a resistor R36, a resistor R39 and a capacitor C33;
the output end of the preamplifier circuit is electrically connected with a pin 2 of an operational amplifier OPA2344 through a resistor R36, a pin 3 of the operational amplifier OPA2344 is electrically connected with a reference voltage regulating circuit, a resistor R39 is connected between the pin 2 and a pin 1 of the operational amplifier OPA2344 in parallel, a capacitor C33 is connected to two ends of a resistor R39 in parallel, and the pin 1 of the operational amplifier OPA2344 is electrically connected with the input end of a current driving circuit.
On the basis of the above technical solution, preferably, the reference voltage adjusting circuit includes: a reference voltage source, a resistor R37, a resistor R37 and a potentiometer RP 3;
the pin 3 of the operational amplifier OPA2344 is electrically connected to one end of the resistor R37 and one end of the resistor R38, respectively, the other end of the resistor R37 is grounded, the other end of the resistor R38 is electrically connected to the adjustment end of the potentiometer RP3, one end of the potentiometer RP3 is electrically connected to a reference voltage source, and the other end of the potentiometer RP3 is grounded.
On the basis of the above technical solution, preferably, the laser is a semiconductor laser, and a laser diode is built in the laser.
On the basis of the above technical solution, preferably, the current drive circuit includes: resistors R40-R42, a capacitor C34, a capacitor C35, a triode Q3 and a triode Q5;
the output end of the secondary amplifying circuit is electrically connected with the base of a triode Q3 through a resistor R40, the emitter of the triode Q3 is grounded, the collector of the triode Q3 is electrically connected with one end of a resistor R41, one end of a capacitor C34 and the base of a triode Q5, the other end of the resistor R41 is electrically connected with a power supply, the other end of the capacitor C34 is grounded, the emitter of the triode Q5 is grounded through a resistor R42, the collector of the triode Q5 is electrically connected with the cathode of a laser diode, the anode of the laser diode is electrically connected with the power supply, and the capacitor C35 is connected with the two ends of the laser diode in parallel.
The utility model discloses a laser instrument drive circuit based on laser emission system has following beneficial effect for prior art:
(1) the laser is driven in an analog mode, and the power of an optical signal output by the laser is adjusted, so that the optical signal output by the laser is stable;
(2) the power of an optical signal output by the laser is adjusted by arranging a negative feedback loop consisting of the laser, the photodiode, the pre-amplification circuit, the secondary amplification circuit and the current driving circuit, so that when the output optical power of the laser diode LD is increased, the forward current of the laser diode LD in the laser is reduced, the output power is reduced, a negative feedback effect is realized, and the output optical power is stable; when the output light power of the laser diode LD is reduced, the forward current of the laser diode LD in the laser is increased, the output power is increased, and the positive feedback effect is achieved, so that the output light power is stable;
(3) through setting up reference voltage regulating circuit, on the one hand can be through adjusting its resistance value and then adjust output optical power's size, on the other hand, adjust secondary amplifier circuit's zero point position, can guarantee the zero point correction of output.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a structural diagram of a laser driving circuit based on a laser emitting system of the present invention;
fig. 2 is a circuit diagram of the laser driving circuit based on the laser emitting system of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to 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 all belong to the protection scope of the present invention.
As shown in fig. 1, the laser driving circuit based on laser emitting system of the present invention includes a laser, a photodiode, a pre-amplifier circuit, a secondary amplifier circuit, a reference voltage adjusting circuit and a current driving circuit.
And the laser outputs an optical signal with stable power. Preferably, the laser is a semiconductor laser, and a laser diode is disposed therein, and in this embodiment, the laser diode is denoted as LD.
And the photodiode serving as a photoelectric detector is packaged together with the laser and used for detecting the power change of an output optical signal of the laser diode LD, converting the power change into photocurrent and feeding the photocurrent back to the preamplification circuit. In this embodiment, the anode of the photodiode is grounded, the cathode of the photodiode is electrically connected to the first input terminal of the secondary amplifying circuit through the pre-amplifying circuit, the reference voltage adjusting circuit is electrically connected to the second input terminal of the secondary amplifying circuit, the output terminal of the secondary amplifying circuit is electrically connected to the input terminal of the current driving circuit, and the output terminal of the current driving circuit is electrically connected to the laser. In this embodiment, the photodiode is labeled as D9.
The pre-amplifying circuit amplifies the photocurrent output by the photodiode and converts the amplified photocurrent into a feedback voltage, and the feedback voltage has negative feedback effect on the forward current of the laser diode LD after being amplified by the secondary amplifying circuit, so that the optical signal output by the laser is stable. Preferably, in this embodiment, as shown in fig. 2, the preamplifier circuit includes: an operational amplifier OPA2344, a resistor R35 and a capacitor C32; specifically, the cathode of the photodiode is electrically connected to the pin 6 of the operational amplifier OPA2344, the resistor R35 is connected in parallel between the pin 6 and the pin 7 of the operational amplifier OPA2344, the capacitor C32 is connected in parallel between two ends of the resistor R32, and the pin 7 of the operational amplifier OPA2344 is electrically connected to the first input terminal of the secondary amplifying circuit. Wherein, a pin 7 of the operational amplifier OPA2344 is an output end of the preamplifier circuit; resistor R35 and capacitor C32 are used to adjust the gain.
And the secondary amplifying circuit amplifies the feedback voltage output by the pre-amplifying circuit to enable the feedback voltage to meet the voltage requirement of the triode drive. Preferably, in this embodiment, as shown in fig. 2, the secondary amplification circuit includes: an operational amplifier OPA2344, a resistor R36, a resistor R39 and a capacitor C33; specifically, the output terminal of the preamplifier circuit is electrically connected to the pin 2 of the operational amplifier OPA2344 through the resistor R36, the pin 3 of the operational amplifier OPA2344 is electrically connected to the reference voltage regulating circuit, the resistor R39 is connected in parallel between the pin 2 and the pin 1 of the operational amplifier OPA2344, the capacitor C33 is connected in parallel to two ends of the resistor R39, and the pin 1 of the operational amplifier OPA2344 is electrically connected to the input terminal of the current driving circuit. Pin 2 of the OPA2344 is a first input terminal of the secondary amplifying circuit; pin 3 of the operational amplifier OPA2344 is the second input of the secondary amplification circuit; pin 1 of the operational amplifier OPA2344 is the output of the secondary amplification circuit; the resistor R38 and the capacitor C33 are used for adjusting the gain; the resistor R36 is used for decoupling.
And the reference voltage regulating circuit regulates the output optical power by regulating the reference voltage of the non-inverting input end of the integrated operational amplifier in the secondary amplifying circuit. As shown in fig. 2, the reference voltage adjusting circuit includes: a reference voltage source, a resistor R37, a resistor R37 and a potentiometer RP 3; specifically, the pin 3 of the operational amplifier OPA2344 is electrically connected to one end of the resistor R37 and one end of the resistor R38, respectively, the other end of the resistor R37 is grounded, the other end of the resistor R38 is electrically connected to the adjustment terminal of the potentiometer RP3, one end of the potentiometer RP3 is electrically connected to the reference voltage source, and the other end of the potentiometer RP3 is grounded. The output voltage of the secondary amplifying circuit can be adjusted by adjusting the resistance value of the potentiometer RP3, so that the optical power of the output signal of the laser can be adjusted.
And the current driving circuit provides stable current driving for the laser, so that the laser can output light with stable power. Preferably, in this embodiment, as shown in fig. 2, the current driving circuit includes: resistors R40-R42, a capacitor C34, a capacitor C35, a triode Q3 and a triode Q5; specifically, the output end of the secondary amplifying circuit is electrically connected with the base of a triode Q3 through a resistor R40, the emitter of a triode Q3 is grounded, the collector of the triode Q3 is electrically connected with one end of a resistor R41, one end of a capacitor C34 and the base of a triode Q5, the other end of the resistor R41 is electrically connected with a power supply, the other end of the capacitor C34 is grounded, the emitter of a triode Q5 is grounded through a resistor R42, the collector of the triode Q5 is electrically connected with the cathode of a laser diode LD, the anode of the laser diode LD is electrically connected with the power supply, and the capacitor C35 is connected at two ends of the laser diode in parallel. The base electrode of the triode Q3 is the input end of the current driving circuit, and the collector electrode of the triode Q5 is the output end of the current driving circuit; the capacitor C35 is used for overvoltage protection; the feedback voltage output by the pre-amplification circuit is input to the base electrode of the triode Q3 after passing through the secondary amplification circuit; when the transistor Q3 operates in the amplifying region, the base voltage input to the transistor Q5 decreases with the increase of the base voltage of the transistor Q3, and the base current of the transistor Q5 also decreases; when the transistor Q5 operates in the amplifying region, the forward current of the laser diode LD, i.e., the collector current of the transistor Q5, increases with the increase of the base current of the transistor Q5; if the output light power of the laser diode LD becomes larger, the base current fed back to the triode Q5 becomes smaller, so that the forward current of the laser diode LD also becomes smaller, a negative feedback effect is achieved, and the output light power is stable; in addition, the reference voltage of the second input end of the secondary amplifying circuit can be adjusted by adjusting the resistance value of the reference voltage adjusting circuit so as to adjust the output optical power.
The working principle of the embodiment is as follows: when the output optical power of the laser diode LD becomes larger, the photodiode detects the optical power signal, the output photocurrent becomes larger accordingly, after the photocurrent signal is amplified by the preamplifier circuit and the secondary amplifier circuit, the voltage output to the base of the triode Q3 becomes larger accordingly, the base voltage and the base current input to the triode Q5 decrease with the increase of the base voltage of the triode Q3, and the collector current of the triode Q5 decreases with the decrease of the base current of the triode Q5, that is, the forward current of the laser diode LD decreases, which plays a role of negative feedback, so that the output optical power is stable.
When the output light power of the laser diode LD decreases, the voltage and current variations of the circuit are opposite to the case where the output light power of the laser diode LD increases, and therefore, description thereof will not be repeated.
The beneficial effect of this embodiment does: the laser is driven in an analog mode, and the power of an optical signal output by the laser is adjusted, so that the optical signal output by the laser is stable;
the power of an optical signal output by the laser is adjusted by arranging a negative feedback loop consisting of the laser, the photodiode, the pre-amplification circuit, the secondary amplification circuit and the current driving circuit, so that when the output optical power of the laser diode LD is increased, the forward current of the laser diode LD in the laser is reduced, the output power is reduced, a negative feedback effect is realized, and the output optical power is stable; when the output light power of the laser diode LD is reduced, the forward current of the laser diode LD in the laser is increased, the output power is increased, and the positive feedback effect is achieved, so that the output light power is stable;
through setting up reference voltage regulating circuit, on the one hand can be through adjusting its resistance value and then adjust output optical power's size, on the other hand, adjust secondary amplifier circuit's zero point position, can guarantee the zero point correction of output.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. Laser instrument drive circuit based on laser emission system, it includes laser instrument and photodiode, its characterized in that: the circuit also comprises a pre-amplification circuit, a secondary amplification circuit, a reference voltage regulating circuit and a current driving circuit;
the anode of the photodiode is grounded, the cathode of the photodiode is electrically connected with the first input end of the secondary amplifying circuit through the pre-amplifying circuit, the reference voltage regulating circuit is electrically connected with the second input end of the secondary amplifying circuit, the output end of the secondary amplifying circuit is electrically connected with the input end of the current driving circuit, and the output end of the current driving circuit is electrically connected with the laser.
2. The laser driving circuit based on the laser emission system as claimed in claim 1, wherein: the pre-amplifier circuit includes: an operational amplifier OPA2344, a resistor R35 and a capacitor C32;
the cathode of the photodiode is electrically connected to the pin 6 of the OPA2344, the resistor R35 is connected in parallel between the pin 6 and the pin 7 of the OPA2344, the capacitor C32 is connected in parallel to two ends of the resistor R32, and the pin 7 of the OPA2344 is electrically connected to the first input terminal of the secondary amplifying circuit.
3. The laser driving circuit based on the laser emission system as claimed in claim 1, wherein: the secondary amplification circuit includes: an operational amplifier OPA2344, a resistor R36, a resistor R39 and a capacitor C33;
the output end of the preamplifier circuit is electrically connected with a pin 2 of an operational amplifier OPA2344 through a resistor R36, a pin 3 of the operational amplifier OPA2344 is electrically connected with a reference voltage regulating circuit, a resistor R39 is connected between the pin 2 and the pin 1 of the operational amplifier OPA2344 in parallel, a capacitor C33 is connected to two ends of the resistor R39 in parallel, and the pin 1 of the operational amplifier OPA2344 is electrically connected with the input end of a current driving circuit.
4. A laser driving circuit based on a laser emission system as claimed in claim 3, wherein: the reference voltage regulating circuit includes: a reference voltage source, a resistor R37, a resistor R37 and a potentiometer RP 3;
the pin 3 of the operational amplifier OPA2344 is electrically connected with one end of a resistor R37 and one end of a resistor R38 respectively, the other end of the resistor R37 is grounded, the other end of the resistor R38 is electrically connected with an adjusting end of a potentiometer RP3, one end of the potentiometer RP3 is electrically connected with a reference voltage source, and the other end of the potentiometer RP3 is grounded.
5. The laser driving circuit based on the laser emission system as claimed in claim 1, wherein: the laser is a semiconductor laser and is internally provided with a laser diode.
6. The laser driving circuit based on the laser emission system as claimed in claim 5, wherein: the current drive circuit includes: resistors R40-R42, a capacitor C34, a capacitor C35, a triode Q3 and a triode Q5;
the output end of the secondary amplifying circuit is electrically connected with the base of a triode Q3 through a resistor R40, the emitter of the triode Q3 is grounded, the collector of the triode Q3 is electrically connected with one end of a resistor R41, one end of a capacitor C34 and the base of a triode Q5, the other end of the resistor R41 is electrically connected with a power supply, the other end of the capacitor C34 is grounded, the emitter of the triode Q5 is grounded through a resistor R42, the collector of the triode Q5 is electrically connected with the cathode of a laser diode, the anode of the laser diode is electrically connected with the power supply, and the capacitor C35 is connected with the two ends of the laser diode in parallel.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021912563.5U CN212875046U (en) | 2020-09-04 | 2020-09-04 | Laser driving circuit based on laser emitting system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021912563.5U CN212875046U (en) | 2020-09-04 | 2020-09-04 | Laser driving circuit based on laser emitting system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113224640A (en) * | 2021-07-08 | 2021-08-06 | 成都成电光信科技股份有限公司 | Drive circuit of laser and drive method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113224640A (en) * | 2021-07-08 | 2021-08-06 | 成都成电光信科技股份有限公司 | Drive circuit of laser and drive method thereof |
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