CN201766284U - Light power monitoring circuit of digital light emitter - Google Patents
Light power monitoring circuit of digital light emitter Download PDFInfo
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- CN201766284U CN201766284U CN201020537077XU CN201020537077U CN201766284U CN 201766284 U CN201766284 U CN 201766284U CN 201020537077X U CN201020537077X U CN 201020537077XU CN 201020537077 U CN201020537077 U CN 201020537077U CN 201766284 U CN201766284 U CN 201766284U
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- current mirror
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Abstract
The utility model provides a light power monitoring circuit of a digital light emitter, comprising a laser device emission assembly, a laser device driver, a single chip microcomputer, a PNP type triode current mirror image current and a sampling resistance. The utility model is characterized in that the laser device emission assembly consists of a laser diode and a back photoelectric diode; the PNP type triode current mirror image current consists of a first and a second PNP triode, and a first and a second base of the two PNP type triodes are mutually connected; a first collector electrode, the first base and the laser device driver are connected; the laser device driver is connected to the cathode of the laser diode; a first and a second emitting electrode of the two PNP type triode are in a parallel connecting and after that are connected to the anode of the back photoelectric diode; a second collector electrode is connected to the single chip microcomputer and one end of the sampling resistance, and the other end of the sampling resistance is connected to the ground. The utility model is advantageous in that the voltage on the resistance is only required to be collected and sampled, and the voltage sampling loop is free of common-mode noise, thereby the digital emission light power monitoring is high in precision and good in stability.
Description
Technical field
The utility model relates to the digital light radiating circuit that the digital fiber transmission system is used, and relates in particular to a kind of optical power monitoring circuit of digital light reflector.
Background technology
The optical power monitoring circuit of digital light reflector of the prior art as shown in Figure 1, this circuit comprises: a laser assembly 10, a laser driver 20, a sampling resistor 30 and a single-chip microcomputer 40.After the reflector operate as normal, the laser diode 11 that is provided with in the laser emitting module 10 is luminous, photodiode 12 produces photoelectric current dorsad dorsad, in this current circuit owing to be connected in series sampling resistor 30, need only the common-mode voltage that collects the resistance two ends by single-chip microcomputer 40, utilize the voltage difference at its two ends just can obtain the size of photoelectric current dorsad divided by the sampling resistor value.Because the photoelectric efficiency of photodiode 12 is constant in certain reference optical power dorsad, so the luminous power that receives of optical diode 12 is a linear relationship with the photoelectric current of generation dorsad, the big photoelectric current of luminous power just greatly, otherwise just little.Write a coefficient by optical power calibration, just can obtain the corresponding a certain fixing photoelectric current of a certain luminous power.Also just know the luminous power size indirectly as long as know the photoelectricity flow valuve, just reached the function of the average emitted luminous power size of monitoring digital light reflector thus.
During the reflector operate as normal, suppose that recording luminous power with light power meter is Po, the voltage that single-chip microcomputer collects sampling resistor 30 two ends is respectively V2, V1 (supposition V2 is greater than V1), and then luminous power is
Po＝{(V2-V1)/R}*K
K considers that other all factors such as photoelectric current conversion efficiency are at interior fixed coefficient dorsad.Po is the test value of light power meter, the resistance R of sampling resistor 30 is known, once just can obtain the K value by software calibration during the optical transmitting set manufacturer production, no longer need to cut off light path after the system manufacturer networking and just measure monitoring optical power size in real time, when optical power change, as long as single-chip microcomputer reads V2, V1 go out luminous power with regard to the energy inverse size again.The shortcoming that this circuit exists: subtract each other after single-chip microcomputer 40 is gathered two magnitude of voltage V2, V1, because two voltages can change with various factorss such as temperature, 2 common-mode voltage instability, the precision of Cai Jiing can reduce like this, photodiode 12 current circuit common-mode noises directly influence the stability that single-chip microcomputer 40 is gathered voltage dorsad, and the precision of luminous power in the luminous power real-time report process is not high so this kind mode can be brought, the characteristics of less stable.
The utility model content
The utility model provides a kind of precision height, the stability optical power monitoring circuit of digital light reflector preferably.
For reaching above goal of the invention, the utility model provides a kind of optical power monitoring circuit of digital light reflector, comprise: a laser emitting module, one laser driver, one single-chip microcomputer, an one positive-negative-positive triode current mirror circuit and a sampling resistor, described laser emitting module comprises laser diode and photodiode dorsad, described positive-negative-positive triode current mirror circuit comprises first, the second positive-negative-positive triode, two positive-negative-positive triodes first wherein, second base stage is connected, first collector electrode, first base stage is connected with described laser driver three, described laser driver is connected with the negative electrode of laser diode, two positive-negative-positive triodes first, second emitter and connect the back be connected with the anode of described photodiode dorsad, second collector electrode connects an end of described single-chip microcomputer and sampling resistor, this sampling resistor other end ground connection.
Described positive-negative-positive triode current mirror circuit is an integrated positive-negative-positive triode current mirror chip.
The equal current proportion mirror image in photoelectric current loop comes out owing to utilize positive-negative-positive triode current mirror circuit to incite somebody to action dorsad in the technique scheme, as long as by a magnitude of voltage on the single-chip microcomputer collection sampling resistor, just can reach the luminous power size of monitoring the digital light reflector constantly, and voltage acquisition circuit has not had common-mode noise, and this circuit has the characteristics of optical power monitoring precision height, good stability.
Description of drawings
Fig. 1 represents the optical power monitoring circuit theory diagrams of prior art digital light reflector;
Fig. 2 represents the optical power monitoring circuit theory diagrams of the utility model digital light reflector.
Embodiment
Describe the utility model preferred example in detail below in conjunction with accompanying drawing.
The optical power monitoring circuit of digital light reflector as shown in Figure 2, comprise: a laser emitting module 10, one laser driver 20, one single-chip microcomputer 40, an one positive-negative-positive triode current mirror circuit 50 and a sampling resistor 60, laser emitting module 10 comprises laser diode 11 and photodiode 12 dorsad, positive-negative-positive triode current mirror circuit 50 comprises first, the second positive-negative- positive triode 51,52, two positive-negative-positive triodes first wherein, second base stage is connected, first collector electrode, first base stage is connected with laser driver 20 threes, laser driver 20 is connected with the negative electrode of laser diode 11, two positive-negative-positive triodes first, second emitter also connects the back and is connected with the anode of photodiode 12 dorsad, second collector electrode connects an end of single-chip microcomputer 40 and sampling resistor 60, sampling resistor other end ground connection.Positive-negative-positive triode current mirror circuit 50 can adopt an integrated positive-negative-positive triode current mirror chip.
At first digital light reflector production firm utilizes light power meter to read the emission luminous power size Po of digital light reflector, and gathers the sampled voltage V of sampling resistors 60 by single-chip microcomputer 40, and the resistance R1 of sampling resistor 60 is known, by following formula:
Po＝(V/R1)*K
Can calculate and comprise the K value of factor such as photoelectric current conversion efficiency dorsad, this K value is changeless, different sample voltage value V ' that when system manufacturer is used the digital light reflector, at every turn collect then by single-chip microcomputer 40, utilize software control single-chip microcomputer 40 just can calculate corresponding luminous power size Po ', Po ' value can real-time report be given system, to reach the function of real-time monitoring digital light reflector emission luminous power size.
The utility model technology only need be gathered a voltage of sampling resistor 60, to dorsad with positive-negative-positive triode current mirror circuit, the equal current proportion mirror image in photoelectric current loop comes out, voltage acquisition circuit has not had the common-mode noise in the prior art scheme, solve the not shortcoming of high stability difference of precision of the prior art thus, also obtained effect preferably in the actual verification.
Claims (2)
1. the optical power monitoring circuit of a digital light reflector, it is characterized in that, comprise: a laser emitting module (10), one laser driver (20), one single-chip microcomputer (40), an one positive-negative-positive triode current mirror circuit (50) and a sampling resistor (60), described laser emitting module (10) comprises laser diode (11) and photodiode (12) dorsad, described positive-negative-positive triode current mirror circuit (50) comprises first, the second positive-negative-positive triode (51,52), two positive-negative-positive triodes first wherein, second base stage is connected, first collector electrode, first base stage is connected with described laser driver (20) three, described laser driver (20) is connected with the negative electrode of laser diode (11), two positive-negative-positive triodes first, second emitter and connect the back be connected with the anode of described photodiode dorsad (12), second collector electrode connects an end of described single-chip microcomputer (40) and sampling resistor (60), sampling resistor other end ground connection.
2. the optical power monitoring circuit of digital light reflector according to claim 1 is characterized in that, described positive-negative-positive triode current mirror circuit (50) is an integrated positive-negative-positive triode current mirror chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020537077XU CN201766284U (en) | 2010-09-20 | 2010-09-20 | Light power monitoring circuit of digital light emitter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020537077XU CN201766284U (en) | 2010-09-20 | 2010-09-20 | Light power monitoring circuit of digital light emitter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201766284U true CN201766284U (en) | 2011-03-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201020537077XU Expired - Lifetime CN201766284U (en) | 2010-09-20 | 2010-09-20 | Light power monitoring circuit of digital light emitter |
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| CN (1) | CN201766284U (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012139397A1 (en) * | 2011-04-15 | 2012-10-18 | 中兴通讯股份有限公司 | Digital control method and system for output optical power of laser |
| CN102857298A (en) * | 2012-04-25 | 2013-01-02 | 索尔思光电（成都）有限公司 | Circuit and method for monitoring power parameter in optical module |
| CN102983497A (en) * | 2012-11-30 | 2013-03-20 | 索尔思光电（成都）有限公司 | Laser backlight current feedback control method |
| CN103837732A (en) * | 2014-03-21 | 2014-06-04 | 上海富欣智能交通控制有限公司 | Passive current detecting circuit |
| CN109990896A (en) * | 2019-04-18 | 2019-07-09 | 黎伟雄 | Array infrared photocell recycles amplifier element |
| CN111404615A (en) * | 2020-04-23 | 2020-07-10 | 东莞铭普光磁股份有限公司 | High-compatibility optical power sampling monitoring circuit and method |
| CN111416660A (en) * | 2020-04-23 | 2020-07-14 | 东莞铭普光磁股份有限公司 | High-compatibility optical power monitoring circuit and monitoring method |
| CN111817781A (en) * | 2020-06-18 | 2020-10-23 | 武汉光迅科技股份有限公司 | Optical power monitoring circuit and method |
-
2010
- 2010-09-20 CN CN201020537077XU patent/CN201766284U/en not_active Expired - Lifetime
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012139397A1 (en) * | 2011-04-15 | 2012-10-18 | 中兴通讯股份有限公司 | Digital control method and system for output optical power of laser |
| CN102857298A (en) * | 2012-04-25 | 2013-01-02 | 索尔思光电（成都）有限公司 | Circuit and method for monitoring power parameter in optical module |
| CN102857298B (en) * | 2012-04-25 | 2015-10-21 | 索尔思光电（成都）有限公司 | The circuit of monitor power parameter and method in optical module |
| CN102983497A (en) * | 2012-11-30 | 2013-03-20 | 索尔思光电（成都）有限公司 | Laser backlight current feedback control method |
| CN102983497B (en) * | 2012-11-30 | 2015-05-13 | 索尔思光电（成都）有限公司 | Laser backlight current feedback control method |
| CN103837732A (en) * | 2014-03-21 | 2014-06-04 | 上海富欣智能交通控制有限公司 | Passive current detecting circuit |
| CN103837732B (en) * | 2014-03-21 | 2017-07-18 | 上海富欣智能交通控制有限公司 | Passive current detection circuit |
| CN109990896A (en) * | 2019-04-18 | 2019-07-09 | 黎伟雄 | Array infrared photocell recycles amplifier element |
| CN111404615A (en) * | 2020-04-23 | 2020-07-10 | 东莞铭普光磁股份有限公司 | High-compatibility optical power sampling monitoring circuit and method |
| CN111416660A (en) * | 2020-04-23 | 2020-07-14 | 东莞铭普光磁股份有限公司 | High-compatibility optical power monitoring circuit and monitoring method |
| CN111817781A (en) * | 2020-06-18 | 2020-10-23 | 武汉光迅科技股份有限公司 | Optical power monitoring circuit and method |
| CN111817781B (en) * | 2020-06-18 | 2022-07-15 | 武汉光迅科技股份有限公司 | Optical power monitoring circuit and method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20170531 Address after: 518101, Guangdong, Shenzhen Baoan District Xian two road COFCO Business Park 2, 1503 Patentee after: Shenzhen Apat Optoelectronics Components Co., Ltd. Address before: South South technology twelve road 518057 in Guangdong Province, Shenzhen high tech Industrial Park, No. 8 Frestech. Patentee before: Shenzhen Neo Photonic Technology Co., Ltd. |
|
| CX01 | Expiry of patent term |
Granted publication date: 20110316 |
|
| CX01 | Expiry of patent term |