CN211377178U - Laser diode power maintaining controller - Google Patents
Laser diode power maintaining controller Download PDFInfo
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- CN211377178U CN211377178U CN202020260504.8U CN202020260504U CN211377178U CN 211377178 U CN211377178 U CN 211377178U CN 202020260504 U CN202020260504 U CN 202020260504U CN 211377178 U CN211377178 U CN 211377178U
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- operational amplifier
- laser diode
- resistor
- diode
- positive pole
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Abstract
The utility model discloses a laser diode power conservation controller, including operational amplifier A1, operational amplifier A2, operational amplifier A3 and operational amplifier A4, the input positive pole of operational amplifier A2 connects modulation voltage signal Vm, the input negative pole connecting resistance R3 of operational amplifier A2 and the output of operational amplifier A2, the other end connecting resistance R4 of resistance R3 and the input positive pole of operational amplifier A4, the input positive pole of operational amplifier A3 connects modulation voltage signal Vref, the utility model discloses a laser diode power conservation controller has utilized the mechanism of real-time power feedback to adjust laser diode's operating current, eliminate laser diode because of influences such as temperature, modulation frequency, luminous efficiency and ageing, keep laser diode output power to follow the change of control power all the time, expanded laser diode's operating temperature scope and work linear region, the whole service life of the product is prolonged.
Description
Technical Field
The utility model relates to a diode technical field specifically is a laser diode power keeps controller.
Background
The laser diode is widely applied in the fields of laser ranging, correlation alarms and the like, the stability of the laser diode is related to the temperature, and the prior art has the following defects in the regulation and control of the laser diode: 1. the external differential quantum efficiency of the laser diode is smaller and smaller along with the temperature rise, so that the modulation power amplitude of the laser diode is smaller along with the temperature rise; 2. above the threshold current, the P-I linear region of the laser diode is generally small, and thus the modulation waveform is severely distorted non-linearly.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a laser diode power keeps controller 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:
a laser diode power maintaining controller comprises an operational amplifier A1, an operational amplifier A2, an operational amplifier A3 and an operational amplifier A4, wherein the anode of the input end of the operational amplifier A2 is connected with a modulation voltage signal Vm, the cathode of the input end of the operational amplifier A2 is connected with a resistor R3 and the output end of an operational amplifier A2, the other end of a resistor R3 is connected with the anode of the input end of a resistor R4 and the anode of the input end of an operational amplifier A4, the anode of the input end of an operational amplifier A3 is connected with a modulation voltage signal Vref, the cathode of the input end of an operational amplifier A3 is connected with the other end of a resistor R4 and the output end of an operational amplifier A3, the cathode of the input end of an operational amplifier A4 is connected with a resistor R and a capacitor C, the other end of the resistor R is connected with the output end of a resistor R1 and the anode of an operational amplifier A1, the input end of the operational amplifier A1, the other end of the resistor R2 is grounded, the cathode of the diode PD is connected with the anode of the diode LD and the power supply VCC, the cathode of the diode PD is connected with the resistor R5, the other end of the resistor R5 is connected with the collector of the triode Q1, the base of the triode Q1 is connected with the output end of the capacitor C and the operational amplifier A4, and the emitter of the triode Q1 is grounded through the resistor Re.
As a further aspect of the present invention: the diode LD is a laser diode.
As a further aspect of the present invention: the diode PD is a laser diode.
As a further aspect of the present invention: the triode Q is an NPN triode.
Compared with the prior art, the beneficial effects of the utility model are that: the utility model discloses laser diode power keeps controller has utilized the mechanism of real-time power feedback to adjustment laser diode's operating current eliminates laser diode because of influences such as temperature, modulation frequency, luminous efficacy and ageing, keeps laser diode output to follow the change of control power all the time, has expanded laser diode's operating temperature scope and work linear region, has prolonged product whole life-span.
Description of the drawings:
fig. 1 is a circuit diagram of a laser diode power conservation controller according to the present invention.
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, a laser diode power conservation controller includes an operational amplifier a1, an operational amplifier a2, an operational amplifier A3 and an operational amplifier A4, wherein a positive terminal of an input terminal of the operational amplifier a2 is connected to a modulation voltage signal Vm, a negative terminal of an input terminal of the operational amplifier a2 is connected to a resistor R3 and an output terminal of the operational amplifier a2, the other terminal of a resistor R3 is connected to a positive terminal of an input terminal of the operational amplifier A4, a positive terminal of an input terminal of the operational amplifier A3 is connected to a modulation voltage signal Vref, a negative terminal of an input terminal of the operational amplifier A3 is connected to the other terminal of the resistor R4 and an output terminal of the operational amplifier A3, a negative terminal of an input terminal of the operational amplifier A4 is connected to a resistor R and a capacitor C, the other terminal of the resistor R is connected to a resistor R1 and an output terminal of the operational amplifier a1, the negative electrode of the input end of the operational amplifier A1 is connected with the other end of the resistor R1 and the resistor R2, the other end of the resistor R2 is grounded, the negative electrode of the diode PD is connected with the positive electrode of the diode LD and the power supply VCC, the negative electrode of the diode PD is connected with the resistor R5, the other end of the resistor R5 is connected with the collector of the triode Q1, the base of the triode Q1 is connected with the capacitor C and the output end of the operational amplifier A4, and the emitter of the triode Q1 is grounded through the resistor Re.
The utility model discloses a theory of operation is: the resistor RD is connected with the power monitoring diode PD, and a voltage signal which is in direct proportion to the output light power of the laser diode LD is generated on the resistor RD; the operational amplifier A1, the resistor R1 and the resistor R2 form a voltage amplifier (b in the figure), which amplifies the voltage on the resistor RD and outputs the voltage to the inverting input end of the error voltage amplifier; the error voltage amplifier consists of an operational amplifier A4, a resistor R and a capacitor C (C in the figure), and the resistor R and the capacitor C are used for phase compensation to ensure the stability of a feedback loop; the power control circuit is composed of an operational amplifier A2, an operational amplifier A3, a resistor R3 and a resistor R4 (a in the figure), the operational amplifier A2 and the operational amplifier A3 are respectively configured as followers, and the resistor R3 and the resistor R4 realize a summation algorithm of a modulation voltage signal Vm and a bias voltage signal Vref to obtain a power control voltage signal (Vin); the laser diode driving circuit (d in the figure) consists of a high-frequency triode Q1, a resistor Re and a resistor R5, wherein the resistor Re is connected between an emitting electrode of the triode Q1 and the ground, the bandwidth of the frequency response of the laser diode driving circuit can be expanded, and the resistor R5 is used for limiting the maximum current of the laser diode.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. 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 (4)
1. A laser diode power conservation controller comprises an operational amplifier A1, an operational amplifier A2, an operational amplifier A3 and an operational amplifier A4, and is characterized in that the positive pole of the input end of the operational amplifier A2 is connected with a modulation voltage signal Vm, the negative pole of the input end of the operational amplifier A2 is connected with a resistor R3 and the output end of the operational amplifier A2, the other end of a resistor R3 is connected with the positive pole of the input end of the operational amplifier A4, the positive pole of the input end of the operational amplifier A3 is connected with a modulation voltage signal Vref, the negative pole of the input end of the operational amplifier A3 is connected with the other end of a resistor R4 and the output end of the operational amplifier A3, the negative pole of the input end of the operational amplifier A4 is connected with a resistor R and a capacitor C, the other end of the resistor R1 and the output end of the operational amplifier A1, the positive pole of the, the negative electrode of the input end of the operational amplifier A1 is connected with the other end of the resistor R1 and the resistor R2, the other end of the resistor R2 is grounded, the negative electrode of the diode PD is connected with the positive electrode of the diode LD and the power supply VCC, the negative electrode of the diode PD is connected with the resistor R5, the other end of the resistor R5 is connected with the collector of the triode Q1, the base of the triode Q1 is connected with the capacitor C and the output end of the operational amplifier A4, and the emitter of the triode Q1 is grounded through the resistor Re.
2. The laser diode power conservation controller of claim 1, wherein the diode LD is a laser diode.
3. The laser diode power conservation controller of claim 1, wherein the diode PD is a laser diode.
4. The laser diode power conservation controller of claim 1, wherein the transistor Q is an NPN transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020260504.8U CN211377178U (en) | 2020-03-05 | 2020-03-05 | Laser diode power maintaining controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020260504.8U CN211377178U (en) | 2020-03-05 | 2020-03-05 | Laser diode power maintaining controller |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211377178U true CN211377178U (en) | 2020-08-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020260504.8U Active CN211377178U (en) | 2020-03-05 | 2020-03-05 | Laser diode power maintaining controller |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211377178U (en) |
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2020
- 2020-03-05 CN CN202020260504.8U patent/CN211377178U/en active Active
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