CN215579541U - Optical module laser drive circuit - Google Patents
Optical module laser drive circuit Download PDFInfo
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- CN215579541U CN215579541U CN202122346607.3U CN202122346607U CN215579541U CN 215579541 U CN215579541 U CN 215579541U CN 202122346607 U CN202122346607 U CN 202122346607U CN 215579541 U CN215579541 U CN 215579541U
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Abstract
The utility model relates to the technical field of optical communication optical modules, in particular to an optical module laser driving circuit, which comprises a voltage control circuit, a feedback circuit, a power chip, a current monitoring circuit and a load laser, wherein the voltage control circuit is connected with the feedback circuit; the power supply chip is provided with a feedback pin and a voltage output pin; the feedback circuit is connected with the feedback pin, the voltage output pin and the voltage control circuit; the current monitoring circuit is connected with the voltage output pin, the voltage control circuit and the load laser. The voltage type driving circuit is designed by utilizing the power supply chip with the specific feedback pin and the voltage output pin, and the selectable types of the power supply chip in the market are more, at least thousands of types of the power supply chip are provided, so that the price of the power supply chip is lower, the price of the voltage type driving circuit made of the power supply chip is naturally reduced, generally not more than ten yuan, and the cost of the optical module laser is greatly reduced.
Description
Technical Field
The utility model relates to the technical field of optical communication optical modules, in particular to an optical module laser driving circuit.
Background
The traditional drive circuit of the bias current of the optical module laser is a current type drive circuit. The current type driving circuit used at present is mostly an integrated circuit, although the current type driving circuit is simple to use, it has the following disadvantages:
1: the selection number is small, and the current type driving circuit used by the optical module laser does not exceed twenty types at most. The types commonly used at present include current-mode digital-to-analog converters, application specific integrated circuits integrated with a current output function, and the like. Only a few manufacturers can provide similar products and the replaceability is poor.
2: the current-mode driving circuit has a weak driving capability, and the current-mode driving circuit has a limited output current capability due to the limitation of an internal MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor, which is a full-name of chinese) power device. The maximum output current of a current type driving circuit used by the existing optical module is about 140mA, and the current type driving circuit can only be used for one laser. If there are multiple lasers in an optical module, then multiple drive circuits are required.
3: the price is high, and the price of a current type driving circuit for the optical module laser is high, generally about dozens of yuan, which is not beneficial to reducing the cost of the optical module.
SUMMERY OF THE UTILITY MODEL
The technical problem solved by the utility model is as follows:
in the prior art, a current type driving circuit used by an optical module laser is high in price, generally about tens of yuan, and is not beneficial to reducing the cost of the optical module laser;
further, the current mode driving circuit in the prior art is limited by the internal MOSFET power device, and has a limited current output capability. At present, the maximum output current of a current type driving circuit used by an optical module laser is about 140mA, and the current type driving circuit can only be used by one laser. If there are multiple lasers in an optical module, then a multi-current mode drive circuit is required.
The utility model is realized by the following steps:
the utility model provides a driving circuit of an optical module laser, which comprises a voltage control circuit 11, a feedback circuit 12, a power chip 13, a current monitoring circuit 14 and a load laser 15, wherein the voltage control circuit is connected with the feedback circuit 12; the power chip 13 has a feedback pin and a voltage output pin;
the feedback circuit 12 is connected with the feedback pin, the voltage output pin and the voltage control circuit 11;
the current monitoring circuit 14 is connected to the voltage output pin, the voltage control circuit 11 and the load laser 15.
Preferably, the feedback circuit 12 is connected to the feedback pin, the voltage output pin and the voltage control circuit 11, and specifically includes:
the feedback circuit 12 comprises a resistor R1, a resistor R2 and a resistor R3;
the resistor R1 is connected with the resistor R2 in series, the other end of the resistor R1 is connected with the voltage output pin, and the other end of the resistor R2 is grounded;
one end of the resistor R3 is connected between the resistor R1 and the resistor R2, and the other end of the resistor R3 is connected with the voltage control circuit 11;
the feedback pin is connected between resistor R1 and resistor R2.
Preferably, the calculation formula among the resistance value R1 ' of the resistor R1, the resistance value R2 ' of the resistor R2, the resistance value R3 ' of the resistor R3, the output voltage value Vf of the feedback pin, the output voltage value Vout of the voltage output pin, and the output voltage value Vdac of the voltage control circuit 11 is as follows: (Vout-Vf)/R1 '+ (Vdac-Vf)/R3 ═ Vf/R2'.
Preferably, the other end of the resistor R3 is connected to the voltage control circuit 11, specifically:
the voltage control circuit 11 comprises a digital-to-analog converter 111 and a microcontroller 112;
the digital-to-analog converter 111 is connected with the microcontroller 112;
the other end of the resistor R3 is connected to the digital-to-analog converter 111.
Preferably, the digital-to-analog converter 111 is connected to the microcontroller 112. The method specifically comprises the following steps:
the digital-to-analog converter 111 is connected with the microcontroller 112 through an I2C interface.
Preferably, the current monitoring circuit 14 is connected to the voltage output pin, the voltage control circuit 11 and the load laser 15, specifically:
the current monitoring circuit 14 includes a resistor R4 and an operational amplifier 141;
one end of the resistor R4 is connected with the voltage output pin, and the other end of the resistor R4 is connected with the load laser 15;
the operational amplifier 141 is connected in parallel to the resistor R4, and the operational amplifier 141 is connected to the voltage control circuit 11.
Preferably, the operational amplifier 141 is connected to the voltage control circuit 11, and specifically includes:
the operational amplifier 141 is connected to the microcontroller 112 of the voltage control circuit 11.
Preferably, the operational amplifier 141 is connected to the microcontroller 112 of the voltage control circuit 11, specifically:
the operational amplifier 141 is connected to the microcontroller 112 of the voltage control circuit 11 through an I2C interface.
Preferably, the maximum output voltage value of the voltage output pin is smaller than the maximum forward voltage value of the load laser 15.
Preferably, if the number of the load lasers 15 is at least 2, the load lasers 15 are connected in parallel with each other.
The optical module laser uses a voltage type driving circuit, a power chip of a specific feedback pin and a voltage output pin is used in the voltage type driving circuit, and the selectable types of the power chip in the market are many, at least hundreds, so that the price of the power chip is low, the price of the voltage type driving circuit made of the power chip is naturally reduced, generally not more than ten yuan, and the cost of the optical module laser is greatly reduced; in addition, some power supply chips can provide a relatively large output current of several hundreds of milliamperes even in an ampere range within the working voltage range of the optical module laser. Thus, one voltage-type driving circuit can drive several optical module lasers simultaneously.
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 the drawings without creative efforts.
Fig. 1 is a schematic diagram of a frame of a laser driving circuit of an optical module according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a laser driving circuit of an optical module according to an embodiment of the present invention.
Detailed Description
In the description of the present invention, the terms "inner", "outer", "longitudinal", "lateral", "upper", "lower", "top", "bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are for convenience only to describe the present invention without requiring the present invention to be necessarily constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
the embodiment of the utility model provides a driving circuit of an optical module laser, which comprises a voltage control circuit 11, a feedback circuit 12, a power chip 13, a current monitoring circuit 14 and a load laser 15, as shown in fig. 1; the power chip 13 has a feedback pin and a voltage output pin; the feedback circuit 12 is connected with the feedback pin, the voltage output pin and the voltage control circuit 11; the current monitoring circuit 14 is connected to the voltage output pin, the voltage control circuit 11 and the load laser 15. The specific working process is as follows: the voltage control circuit 11 outputs a direct-current voltage (an output voltage value of the direct-current voltage is represented by Vdac) to the feedback circuit 12; the feedback pin of the power supply chip 13 also outputs a dc voltage (the output voltage value of the dc voltage is denoted by Vf) to the feedback circuit 12; the voltage output pin of the power chip 13 outputs a dc voltage (the output voltage value of the dc voltage is denoted by Vout) under the combined action of the output voltage value Vdac of the feedback circuit 12 and the voltage control circuit 11 and the output voltage value Vf of the feedback pin, and a current flows through the current monitoring circuit 14 and the load laser 15 under the action of the output voltage value Vout of the voltage output pin, wherein the current flowing through the current monitoring circuit 14 is the same as the current flowing through the load laser 15.
Preferably, this embodiment provides a specific implementation manner of the feedback circuit 12, as shown in fig. 2, the feedback circuit 12 is connected to the feedback pin, the voltage output pin, and the voltage control circuit 11, specifically: the feedback circuit 12 comprises a resistor R1, a resistor R2 and a resistor R3; the resistor R1 is connected with the resistor R2 in series, the other end of the resistor R1 is connected with the voltage output pin, and the other end of the resistor R2 is grounded; one end of the resistor R3 is connected between the resistor R1 and the resistor R2, and the other end of the resistor R3 is connected with the voltage control circuit 11; the feedback pin is connected between resistor R1 and resistor R2. The calculation formula among the resistance value R1 ' of the resistor R1, the resistance value R2 ' of the resistor R2, the resistance value R3 ' of the resistor R3, the output voltage value Vf of the feedback pin, the output voltage value Vout of the voltage output pin, and the output voltage value Vdac of the voltage control circuit 11 is as follows: (Vout-Vf)/R1 '+ (Vdac-Vf)/R3 ═ Vf/R2'.
The present embodiment provides a manner that can be implemented in an actual scenario, specifically, the feedback circuit 12 provided in the present embodiment includes a resistor R1, a resistor R2, and a resistor R3, the resistor R1 is connected in series with the resistor R2, the other end of the resistor R1 is connected to the voltage output pin, and the other end of the resistor R2 is grounded; one end of the resistor R3 is connected between the resistor R1 and the resistor R2, and the other end of the resistor R3 is connected with the voltage control circuit 11; the feedback pin is connected between resistor R1 and resistor R2. The voltage at the two ends of the resistor R1 is the output voltage value Vout of the voltage output pin and the output voltage value Vf of the feedback pin respectively, and the resistance value of the resistor R1 is represented by R1'; the voltage at one end of the resistor R2 is the output voltage value Vf of the feedback pin, the other end of the resistor R2 is grounded, and the resistance value of the resistor R2 is represented by R2'; the voltage across the resistor R3 is the output voltage Vf of the feedback pin and the output voltage Vdac of the voltage control circuit 11, and the resistance of the resistor R3 is represented by R3'. In order to make the output voltage value Vout of the voltage output pin vary with the output voltage value Vdac of the voltage control circuit 11 within a preset range, the calculation of the resistance values of the resistor R1, the resistor R2, and the resistor R3 is critical. The relationship between the resistance value R1 ' of the resistor R1, the resistance value R2 ' of the resistor R2, the resistance value R3 ' of the resistor R3, the output voltage value Vf of the feedback pin, the output voltage value Vout of the voltage output pin, and the output voltage value Vdac of the voltage control circuit 11 follows the following calculation formula: (Vout-Vf)/R1 '+ (Vdac-Vf)/R3 ═ Vf/R2'. The relationship among the resistance value R1 ' of the resistor R1, the resistance value R2 ' of the resistor R2, and the resistance value R3 ' of the resistor R3 can be obtained according to the following manner, so that a resistor with a proper resistance value is selected, specifically:
(1) according to the maximum forward voltage of the load laser 15, the maximum output voltage value Voutmax and the minimum voltage value Voutmin of the output voltage value of the voltage output pin are manually set, that is, the preset range of the output voltage value of the voltage output pin is Voutmin-Voutmin, under a general condition, in order to ensure the safety of the load laser 15, the maximum output voltage value Voutmin of the voltage output pin is manually set to be slightly smaller than the maximum forward voltage of the load laser 15.
Such as: assuming that the maximum forward voltage of the load laser 15 is 3V, the maximum output voltage value Voutmax of the artificially set voltage output pin is 2.8V, and the minimum output voltage value Voutmin of the voltage output pin is 1.2V;
(2) the output voltage Vf of the feedback pin is determined by the power chip 13 itself, and it is assumed that the output voltage Vf of the feedback pin is 1.5V;
(3) the range of the output voltage value Vdac of the voltage control circuit 11 is determined by the voltage control circuit 11, wherein the minimum value of the output voltage value Vdac of the voltage control circuit 11 corresponds to the maximum output voltage value Voutmax of the voltage output pin, and the maximum value of the output voltage value Vdac of the voltage control circuit 11 corresponds to the minimum output voltage value Voutmin of the voltage output pin; assuming that the output voltage value Vdac of the voltage control circuit 11 ranges from 0V to 2.5V, when Vdac is equal to 0V, the corresponding Vout is equal to 2.8V; when Vdac is 2.5V, Vout is 1.2V;
(4) by combining the formulas (1) to (3), the ratio relation among the resistance value R1 ' of the resistor R1, the resistance value R2 ' of the resistor R2 and the resistance value R3 ' of the resistor R3 can be calculated, and then the resistor R1, the resistor R2 and the resistor R3 with proper resistance values can be selected according to the ratio relation.
Such as: the formula is obtained by substituting Vdac equal to 0V, Voutmax equal to 2.8V and Vf equal to 1.5V into the formula (Vout-Vf)/R1 '+ (Vdac-Vf)/R3 equal to Vf/R2':
(2.8-1.5)/R1’+(0-1.5)/R3’＝1.5/R2’(a)
the formula is obtained by substituting Vdac ═ 2.5V, Voutmin ═ 1.2V, and Vf ═ 1.5V into the formula (Vout-Vf)/R1 '+ (Vdac-Vf)/R3 ═ Vf/R2':
(1.2-1.5)/R1’+(2.5-1.5)/R3’＝1.5/R2’(b)
this can be calculated from equations (a) and (b):
R1’/R3’＝16/25； (c)
R1’/R2’＝17/75； (d)
according to the formulas (c) and (d), the resistances of the resistor R1, the resistor R2 and the resistor R3 can be selected as appropriate, such as: when R1 ' is 272 Ω, R3 ' is 425 Ω and R2 ' is 1200 Ω, which are only exemplified by the ratio of the formulas (c) and (d) and are not intended to limit the present invention. After the resistances of the resistor R1, the resistor R2, and the resistor R3 are determined, the output voltage value Vdac of the voltage control circuit 11 is changed, and the output voltage value Vout of the voltage output pin synchronously changes in a reverse direction within a preset range, that is, the output voltage value Vdac of the voltage control circuit 11 becomes larger and the output voltage value Vout of the voltage output pin becomes smaller.
The other end of the resistor R3 is connected to the voltage control circuit 11, and specifically includes: the voltage control circuit 11 comprises a digital-to-analog converter 111 and a microcontroller 112; the digital-to-analog converter 111 is connected with the microcontroller 112; the other end of the resistor R3 is connected to the digital-to-analog converter 111.
The digital-to-analog converter 111 is connected to the microcontroller 112. The method specifically comprises the following steps: the digital-to-analog converter 111 is connected to the microcontroller 112 via an I2C (Inter-Integrated Circuit) interface.
The current monitoring circuit 14 is connected to the voltage output pin, the voltage control circuit 11 and the load laser 15, and specifically includes: the current monitoring circuit 14 includes a resistor R4 and an operational amplifier 141; one end of the resistor R4 is connected with the voltage output pin, and the other end of the resistor R4 is connected with the load laser 15; the operational amplifier 141 is connected in parallel to the resistor R4, and the operational amplifier 141 is connected to the voltage control circuit 11. The current monitoring circuit 14 is composed of a resistor R4 and an operational amplifier 141, and since the resistor R4 is connected in series with the load laser 15 (i.e., one end of the resistor R4 is connected to the voltage output pin, and the other end of the resistor R4 is connected to the load laser 15), the current flowing through the resistor R4 is the same as the current flowing through the load laser 15, so that the current flowing through the load laser 15 can be known by monitoring the current flowing through the resistor R4, and the current of the load laser 15 can be monitored. Therefore, the operational amplifier 141 is connected to the two ends of the resistor R4 for obtaining the voltage of the resistor R4, and since the voltage of the resistor R4 is relatively small, the operational amplifier 141 also has a function of amplifying the obtained voltage of the resistor R4 to improve the monitoring accuracy; the operational amplifier 141 is connected to the microcontroller 112 connected to the voltage control circuit 11, and the operational amplifier 141 amplifies the acquired voltage of the resistor R4 and converts the amplified voltage into a digital signal, and then sends the digital signal to the microcontroller 112, so as to monitor the current of the load laser 15.
The operational amplifier 141 is connected to the voltage control circuit 11, and specifically includes: the operational amplifier 141 is connected to the microcontroller 112 of the voltage control circuit 11.
The operational amplifier 141 is connected to the microcontroller 112 of the voltage control circuit 11, and specifically includes: the operational amplifier 141 is connected to the microcontroller 112 of the voltage control circuit 11 through an I2C interface.
The maximum output voltage value output by the voltage output pin is smaller than the maximum forward voltage value of the load laser 15.
If the number of the load lasers 15 is at least 2, the load lasers are connected in parallel.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A light module laser driving circuit is characterized by comprising a voltage control circuit (11), a feedback circuit (12), a power chip (13), a current monitoring circuit (14) and a load laser (15); wherein the power supply chip (13) has a feedback pin and a voltage output pin;
the feedback circuit (12) is connected with the feedback pin, the voltage output pin and the voltage control circuit (11);
the current monitoring circuit (14) is connected with the voltage output pin, the voltage control circuit (11) and the load laser (15).
2. A light module laser driver circuit according to claim 1, characterized in that the feedback circuit (12) is connected to the feedback pin, the voltage output pin and the voltage control circuit (11), in particular:
the feedback circuit (12) includes a resistor R1, a resistor R2, and a resistor R3;
the resistor R1 is connected with the resistor R2 in series, the other end of the resistor R1 is connected with the voltage output pin, and the other end of the resistor R2 is grounded;
one end of the resistor R3 is connected between the resistor R1 and the resistor R2, and the other end of the resistor R3 is connected with the voltage control circuit (11);
the feedback pin is connected between resistor R1 and resistor R2.
3. The optical module laser driving circuit according to claim 2, wherein the calculation formula among the resistance value R1 ' of the resistor R1, the resistance value R2 ' of the resistor R2, the resistance value R3 ' of the resistor R3, the output voltage value Vf of the feedback pin, the output voltage value Vout of the voltage output pin, and the output voltage value Vdac of the voltage control circuit (11) is: (Vout-Vf)/R1 '+ (Vdac-Vf)/R3 ═ Vf/R2'.
4. The optical module laser driving circuit according to claim 2, wherein the other end of the resistor R3 is connected to the voltage control circuit (11), specifically:
the voltage control circuit (11) comprises a digital-to-analog converter (111) and a microcontroller (112);
the digital-to-analog converter (111) is connected with the microcontroller (112);
the other end of the resistor R3 is connected with the digital-to-analog converter (111).
5. The light module laser driving circuit according to claim 4, wherein the digital-to-analog converter (111) is connected to the microcontroller (112), in particular:
the digital-to-analog converter (111) is connected with the microcontroller (112) through an I2C interface.
6. A light module laser driver circuit according to claim 4, characterized in that the current monitoring circuit (14) is connected to the voltage output pin, the voltage control circuit (11) and the load laser (15), in particular:
the current monitoring circuit (14) comprises a resistor R4 and an operational amplifier (141);
one end of the resistor R4 is connected with the voltage output pin, and the other end of the resistor R4 is connected with the load laser (15);
the operational amplifier (141) is connected in parallel with the resistor R4, and the operational amplifier (141) is connected to the voltage control circuit (11).
7. The optical module laser driving circuit according to claim 6, wherein the operational amplifier (141) is connected to the voltage control circuit (11), and specifically:
the operational amplifier (141) is connected to a microcontroller (112) of the voltage control circuit (11).
8. The light module laser driving circuit according to claim 7, wherein the operational amplifier (141) is connected to a microcontroller (112) of the voltage control circuit (11), in particular:
the operational amplifier (141) is connected with the microcontroller (112) of the voltage control circuit (11) through an I2C interface.
9. A light module laser driver circuit according to any of claims 1-8, characterized in that the maximum output voltage value of the voltage output pin is smaller than the maximum forward voltage value of the load laser (15).
10. A light module laser driver circuit according to claim 1, characterized in that if the number of load lasers (15) is at least 2, the load lasers are connected in parallel with each other.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122346607.3U CN215579541U (en) | 2021-09-27 | 2021-09-27 | Optical module laser drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122346607.3U CN215579541U (en) | 2021-09-27 | 2021-09-27 | Optical module laser drive circuit |
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| Publication Number | Publication Date |
|---|---|
| CN215579541U true CN215579541U (en) | 2022-01-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122346607.3U Active CN215579541U (en) | 2021-09-27 | 2021-09-27 | Optical module laser drive circuit |
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| CN (1) | CN215579541U (en) |
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2021
- 2021-09-27 CN CN202122346607.3U patent/CN215579541U/en active Active
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