CN107566047B - Photoelectric detection circuit and photoelectric module - Google Patents
Photoelectric detection circuit and photoelectric module Download PDFInfo
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- CN107566047B CN107566047B CN201710867837.XA CN201710867837A CN107566047B CN 107566047 B CN107566047 B CN 107566047B CN 201710867837 A CN201710867837 A CN 201710867837A CN 107566047 B CN107566047 B CN 107566047B
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Abstract
The invention relates to the field of photoelectric communication, in particular to a photoelectric detection circuit and a photoelectric module. The photoelectric detection circuit comprises a photoelectric detection module and a comparator, wherein the photoelectric detection module comprises a photodiode and a load resistor which are arranged in parallel, a first end of the photoelectric detection module is grounded, a second end of the photoelectric detection module is connected with a positive input end of the comparator and is connected with an inverting input end of the comparator through a low-pass filter, and the comparator outputs a detection level signal from an output end according to access signals of the positive input end and the inverting input end. The invention also relates to a photovoltaic module. The photoelectric detection circuit and the photoelectric module are designed, and the photoelectric effect of the photodiode is utilized to meet the severe power consumption requirement, so that the photoelectric detection circuit without reverse bias voltage is arranged, the current generated by the reverse bias voltage is reduced to the maximum extent, and the power consumption is reduced.
Description
Technical Field
The invention relates to the field of photoelectric communication, in particular to a photoelectric detection circuit and a photoelectric module.
Background
In the optical-electrical communication transmission, optical-electrical conversion is required for the optical signal of the OSC, but there is a severe limitation on energy consumption.
In the conventional photodetection scheme, as shown in fig. 1, it is necessary to apply a reverse bias 130 to the photodiode 110 and transmit an electrical signal to the comparator 120, and the photodiode 110 has high responsivity and good linearity under the action of the reverse bias 130, but generates a large current when the optical signal is large, so that the power consumption is relatively large.
In particular, in an application scenario with very severe requirements for power consumption, the power consumption requirement cannot be met, which is a very fatal disadvantage, and is one of development elements that have always limited the field of photoelectric communication.
Disclosure of Invention
The invention aims to solve the technical problems that the photoelectric detection circuit is provided for overcoming the defects in the prior art, and solves the problems that when the optical signal is large in the existing photoelectric detection scheme, large current is generated and the power consumption of a power supply is relatively large.
The invention aims to solve the technical problems that the photoelectric module is provided for overcoming the defects in the prior art, and solves the problems that when the optical signal is large in the existing photoelectric detection scheme, large current is generated and the power consumption of a power supply is relatively large.
The technical scheme includes that the photoelectric detection circuit comprises a photoelectric detection module and a comparator, wherein the photoelectric detection module comprises a photodiode and a load resistor which are arranged in parallel, the negative electrode of the photoelectric detection module is grounded, the positive electrode of the photoelectric detection module is connected with the positive input end of the comparator and is connected with the negative input end of the comparator through a low-pass filter, and the comparator outputs a detection level signal from the output end according to access signals of the positive input end and the negative input end.
The photoelectric detection circuit further comprises a no-light detection module and an enabling switch, the enabling switch is connected with the output end of the comparator, the no-light detection module is arranged between the photoelectric detection module and the enabling switch, and if the no-light detection module detects that an electric signal is generated by the photoelectric detection module, the enabling switch is controlled to be turned on, and otherwise, the enabling switch is controlled to be turned off.
The optimal scheme is that the no-light detection module is provided with a preset threshold value, the no-light detection module obtains the voltage amplitude of the optical signal and compares the voltage amplitude with the preset threshold value, if the voltage amplitude is lower than the preset threshold value, no-light signal is output, otherwise, the no-light detection module outputs the optical signal.
The preferred scheme is that the enabling switch comprises a control chip, the control chip comprises an enabling end, the enabling end is connected with the non-light detection module, when the enabling end of the control chip receives an irrelevant signal, the output end of the comparator is closed, and otherwise, the output end of the comparator is opened.
The preferred scheme is that the comparator is a hysteresis comparator.
The technical scheme includes that the photoelectric module comprises a shell, a photoelectric detection circuit and a power supply input end, wherein the photoelectric detection circuit is arranged in the shell and comprises a photoelectric detection module and a comparator, the photoelectric detection module comprises a photodiode and a load resistor which are arranged in parallel, the negative electrode of the photoelectric detection module is grounded, the positive electrode of the photoelectric detection module is connected with the positive phase input end of the comparator and is connected with the reverse phase input end of the comparator through a low-pass filter, the comparator outputs a detection level signal from the output end according to an access signal of the positive phase input end and the reverse phase input end, one end of the power supply input end is connected with the comparator, and one end of the power supply input end is connected with an external power supply.
The photoelectric module further comprises a transmission optical fiber which is arranged on the shell and is communicated with the inside of the shell, an output port of the transmission optical fiber is aligned with a photodiode, an optical signal is output from an output port of the transmission optical fiber and is transmitted to the photodiode, and the photodiode is converted into an electric signal according to the optical signal.
The photoelectric module further comprises a signal wire which is arranged on the shell and connected with the output end of the comparator.
Compared with the prior art, the photoelectric detection circuit and the photoelectric module have the advantages that the photoelectric detection circuit which does not need reverse bias is arranged by utilizing the photoelectric effect of the photodiode according to the severe power consumption requirement, so that the current generated by the reverse bias is reduced to the greatest extent, the power consumption is reduced, and the photodiode does not extract energy from a power supply because the bias is not used, so that the overall power consumption increase caused by strong optical signals is greatly reduced.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic structural diagram of a prior art photodetection scheme;
FIG. 2 is a schematic diagram of the structure of the photo-detection circuit of the present invention;
fig. 3 is a schematic diagram of a specific structure of the photodetecting circuit according to the present invention.
Detailed Description
Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
As shown in fig. 2, the present invention provides a preferred embodiment of a photo detection circuit.
The photoelectric detection circuit comprises a photoelectric detection module 210 and a comparator 220, wherein the photoelectric detection module 210 comprises a photodiode 211 and a load resistor 212 which are arranged in parallel, the cathode of the photoelectric detection module 210 is grounded, the anode of the photoelectric detection module 210 is connected with the non-inverting input end of the comparator 220 and is connected with the inverting input end of the comparator 220 through a low-pass filter 230, and the comparator 220 outputs a detection level signal from an output end according to the access signals of the non-inverting input end and the inverting input end.
The photodiode 211 is a semiconductor device composed of a PN junction, as in a normal diode, and has unidirectional conductivity. But in the circuit it is not a rectifying element but a photo-sensor device that converts an optical signal into an electrical signal. The common diode is in a cut-off state when the reverse voltage is applied, only weak reverse current can flow through the common diode, the photodiode 211 enables the PN junction area to be relatively large as much as possible when the common diode is designed and manufactured so as to receive incident light, the photodiode 211 works under the reverse voltage, the reverse current is extremely weak and called dark current when no illumination exists, the reverse current is rapidly increased to tens of microamps when illumination exists, the light is called photocurrent, and the larger the light intensity is, the larger the reverse current is. The change in light causes a change in current in the photodiode 211, which can convert the optical signal into an electrical signal, which becomes a photo-sensing device.
The comparator 220 is a circuit that compares an analog voltage signal with a reference voltage. The comparator 220 has two inputs of analog signal and outputs of binary signal 0 or 1, and its output remains constant when the difference of the input voltages increases or decreases and the sign is unchanged. Wherein the signal is passed through a low pass filter 230 to provide a decision reference voltage to the inverting input of the comparator 220. When the signal level input to the non-inverting input terminal of the comparator 220 is greater than the reference voltage of the inverting input terminal, the output terminal outputs a logic 1 level, otherwise the output terminal outputs a logic 0 level.
The low-pass filter 230 is an electronic filter device that allows signals below the cut-off frequency to pass, but signals above the cut-off frequency cannot pass. And, the signal output by the low-pass filter 230 will leave a quasi-dc component, and input to one end of the comparator as a judgment reference voltage.
The photodiode 211 generates a signal current I through the load resistor 212 according to ohm's law u=i×r, and generates a voltage U.
Specifically, the photodiode 211 generates a current according to the optical signal by using the photoelectric effect of the photodiode 211 and transmits the current to the non-inverting input terminal of the comparator 220, and the photodiode 211 performs low-pass filtering on the current generated according to the optical signal by the low-pass filter 230 and transmits the filtered current to the inverting input terminal of the comparator 220.
In particular, conventional circuits (prior art, refer to fig. 1) when detecting 3dBm optical signals,
Power consumption p= (2ma+0.7ma) ×3.3v=8.91 mW, where 2mA is photodiode current and 0.7mA is operational amplifier quiescent current.
The photodetection circuit of this embodiment detects a 3dBm optical signal,
Power consumption p=0.7ma×3.3v=2.31 mW, wherein 0.7mA is the operational amplifier quiescent current.
Therefore, the power consumption of the photodetection circuit of this embodiment theoretically has only 26% of the power consumption of the conventional circuit.
As shown in FIG. 3, the present invention provides a preferred embodiment of a no light detection module 240 and an enable switch 250.
The photoelectric detection circuit further comprises a no-light detection module 240 and an enabling switch 250, wherein the enabling switch 250 is connected with the output end of the comparator 220, the no-light detection module 240 is arranged between the photoelectric detection module 210 and the enabling switch 250, and if the no-light detection module 240 detects that the photoelectric detection module 210 generates an electric signal, the enabling switch 250 is controlled to be turned on, and otherwise, the enabling switch 250 is controlled to be turned off.
Wherein, the no light detection module 240 detects the voltage amplitude of the signal light, and when the voltage amplitude is lower than the set threshold value, the no light detection module considers no light. One implementation is through a comparator and an enable switch. Specifically, the no-light detection module 240 sets a preset threshold, the no-light detection module 240 obtains a voltage amplitude of the optical signal and compares the voltage amplitude with the preset threshold, if the voltage amplitude is lower than the preset threshold, no-light signal is output, otherwise, the optical signal is output.
The enabling switch 250 includes a control chip, the control chip includes an enabling end, the enabling end is connected with the no-light detection module 240, when the enabling end of the control chip receives the irrelevant signal, the output end of the comparator is closed, otherwise, the output end of the comparator is opened.
In this embodiment, the comparator 220 is a hysteresis comparator 220, and the hysteresis comparator 220 is a comparator 220 with hysteresis loop transmission characteristics. The inverted input hysteresis comparator 220 with double threshold values is formed by introducing a positive feedback network on the basis of the inverted input single threshold voltage comparator 220. The threshold voltage of such a comparator 220 varies with the output voltage due to feedback. Its sensitivity is lower, but its anti-interference ability is greatly raised.
And, by using the hysteresis comparator 220 in combination with the no light detection module 240 and the enable switch 250, the judgment of the photoelectric conversion judgment capability is further improved.
In the present invention, a preferred embodiment of an optoelectronic module is provided.
The photoelectric module comprises a shell, a photoelectric detection circuit and a power supply input end, wherein the photoelectric detection circuit is arranged in the shell, the photoelectric detection circuit comprises a photoelectric detection module 210 and a comparator 220, the photoelectric detection module 210 comprises a photodiode 211 and a load resistor 212 which are arranged in parallel, the negative electrode of the photoelectric detection module 210 is grounded, the positive electrode of the photoelectric detection module 210 is connected with the non-inverting input end of the comparator 220 and is connected with the inverting input end of the comparator 220 through a low-pass filter 230, the comparator 220 outputs a detection level signal from the output end according to an access signal of the non-inverting input end and the inverting input end, one end of the power supply input end is connected with the comparator 220, and one end of the power supply input end is connected with an external power supply.
The photoelectric detection module 210 belongs to a part of the photoelectric module, which converts an optical signal into an electrical signal, and the detected electrical signal is input into a processor at the rear end for further digital operation. OSC (Optical Supervisory Channel) is a particular optical signal wavelength in an optical communications network.
In this embodiment, the optoelectronic module further includes a transmission fiber disposed on the housing and in conduction with the interior of the housing, the output port of the transmission fiber is aligned with the photodiode 211, the optical signal is output from the output port of the transmission fiber and transmitted into the photodiode 211, and the photodiode 211 is converted into an electrical signal according to the optical signal.
In this embodiment, the optoelectronic module further includes a signal line disposed on the housing and connected to the output terminal of the comparator 220.
The foregoing description of the preferred embodiments of the present invention is not intended to limit the scope of the invention, but rather is intended to cover all modifications and variations within the scope of the present invention as defined in the appended claims.
Claims (5)
1. The photoelectric detection circuit is characterized by comprising a photoelectric detection module and a comparator, wherein the photoelectric detection module comprises a photodiode and a load resistor which are arranged in parallel, the negative electrode of the photoelectric detection module is grounded, and the positive electrode of the photoelectric detection module is connected with the positive input end of the comparator and the negative input end of the comparator through a low-pass filter;
the photoelectric detection circuit further comprises a no-light detection module and an enabling switch, the enabling switch is connected with the output end of the comparator, the no-light detection module is arranged between the photoelectric detection module and the enabling switch, if the no-light detection module detects that the photoelectric detection module generates an electric signal, the enabling switch is controlled to be turned on, and otherwise, the enabling switch is controlled to be turned off;
The no-light detection module is used for setting a preset threshold value, acquiring the voltage amplitude of the optical signal, comparing the voltage amplitude with the preset threshold value, and outputting no-light signal if the voltage amplitude is lower than the preset threshold value, or outputting the optical signal if the voltage amplitude is lower than the preset threshold value, wherein the comparator is a hysteresis comparator.
2. The photoelectric detection circuit according to claim 1, wherein the enable switch comprises a control chip, the control chip comprises an enable end, the enable end is connected with the no-light detection module, when the enable end of the control chip receives the irrelevant signal, the output end of the comparator is closed, and otherwise, the output end of the comparator is opened.
3. A photoelectric module is characterized by comprising a shell, a power input end and a photoelectric detection circuit as claimed in any one of claims 1-2, wherein the photoelectric detection circuit is arranged in the shell and comprises a photoelectric detection module and a comparator, the photoelectric detection module comprises a photodiode and a load resistor which are arranged in parallel, the negative electrode of the photoelectric detection module is grounded, the positive electrode of the photoelectric detection module is connected with the positive input end of the comparator and is connected with the reverse input end of the comparator through a low-pass filter, the comparator outputs a detection level signal from an output end according to an access signal of the positive input end and the reverse input end, one end of the power input end is connected with the comparator, and one end of the power input end is connected with an external power supply.
4. The optoelectronic module of claim 3 further comprising a transmission fiber disposed on the housing and in communication with the interior of the housing, wherein an output port of the transmission fiber is aligned with the photodiode, wherein an optical signal is output from the output port of the transmission fiber and transmitted into the photodiode, and wherein the photodiode converts the optical signal into an electrical signal.
5. The optoelectronic module as set forth in claim 4, further comprising a signal line disposed on the housing and connected to the output of the comparator.
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| CN110111723A (en) * | 2019-06-18 | 2019-08-09 | 京东方科技集团股份有限公司 | Pixel circuit and its driving method, display panel |
| CN113238204A (en) * | 2021-05-07 | 2021-08-10 | 上海嘉沃光电科技有限公司 | Laser pulse detection and measurement input stage circuit |
| CN113624338B (en) * | 2021-08-23 | 2024-06-11 | 深圳市杰芯创电子科技有限公司 | Photoelectric detection chip and method for smart home |
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| CN106781424A (en) * | 2017-01-09 | 2017-05-31 | 上海胤祺集成电路有限公司 | Infrared receiving circuit |
| CN207732771U (en) * | 2017-09-22 | 2018-08-14 | 昂纳信息技术（深圳）有限公司 | A kind of photoelectric detective circuit and optical-electric module |
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| JP2010122004A (en) * | 2008-11-18 | 2010-06-03 | Canon Inc | Measurement apparatus, measurement method, computer, program and, exposure apparatus |
| JP4640507B2 (en) * | 2009-01-06 | 2011-03-02 | ソニー株式会社 | Solid-state imaging device, signal processing method for solid-state imaging device, and imaging device |
| CN105517250B (en) * | 2016-01-20 | 2017-08-08 | 深圳创维－Rgb电子有限公司 | A kind of LED constant current drive system and its constant-current control circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106781424A (en) * | 2017-01-09 | 2017-05-31 | 上海胤祺集成电路有限公司 | Infrared receiving circuit |
| CN207732771U (en) * | 2017-09-22 | 2018-08-14 | 昂纳信息技术（深圳）有限公司 | A kind of photoelectric detective circuit and optical-electric module |
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Address after: No.35 Cuijing Road, Pingshan District, Shenzhen City, Guangdong Province Applicant after: Ona Technology (Shenzhen) Group Co.,Ltd. Address before: No.35 Cuijing Road, Pingshan District, Shenzhen City, Guangdong Province Applicant before: O-NET COMMUNICATIONS (SHENZHEN) Ltd. |
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