CN107566047A - A kind of photoelectric detective circuit and optical-electric module - Google Patents
A kind of photoelectric detective circuit and optical-electric module Download PDFInfo
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- CN107566047A CN107566047A CN201710867837.XA CN201710867837A CN107566047A CN 107566047 A CN107566047 A CN 107566047A CN 201710867837 A CN201710867837 A CN 201710867837A CN 107566047 A CN107566047 A CN 107566047A
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- comparator
- photoelectric
- detection module
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- detective circuit
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Abstract
The present invention relates to photoelectric communication field, and in particular to a kind of photoelectric detective circuit and optical-electric module.The photoelectric detective circuit includes Photoelectric Detection module and comparator, the Photoelectric Detection module includes the photodiode and load resistance being arranged in parallel, the first end ground connection of the Photoelectric Detection module, second end of the Photoelectric Detection module and the normal phase input end of comparator connect, and are connected by the inverting input of low pass filter and comparator；The comparator exports detection level signal according to the access signal of normal phase input end and inverting input from output end.The invention further relates to a kind of optical-electric module.The present invention is by designing a kind of photoelectric detective circuit and optical-electric module, for the power consumption requirements of harshness, using the photoelectric effect of photodiode, a kind of photoelectric detective circuit for not needing reverse biased is set, so as to reduce electric current caused by reverse biased to greatest extent, power consumption is reduced.
Description
Technical field
The present invention relates to photoelectric communication field, and in particular to a kind of photoelectric detective circuit and optical-electric module.
Background technology
, it is necessary to carry out opto-electronic conversion to OSC optical signal in photoelectric communication transmission, but there is the limit of harshness to energy consumption again simultaneously
System.
In existing opto-electronic detection scheme, as shown in Figure 1, it is necessary to photodiode 110 plus reverse biased 130, and
By electric signal transmission into comparator 120, although in the presence of having reverse biased 130, the responsiveness of photodiode 110 is higher,
The linearity is preferable；But when optical signal is larger, very big electric current can be produced, power supply power consumption is bigger.
Particularly, under the application scenarios very harsh to power consumption requirements, power consumption requirements can not be met, this is very fatal
The shortcomings that, and one of the development factors in photoelectric communication field are limited always.
The content of the invention
The technical problem to be solved in the present invention is, for the drawbacks described above of prior art, there is provided a kind of Photoelectric Detection electricity
Road, when solving that optical signal is larger in existing opto-electronic detection scheme, very big electric current can be produced, the problem of power supply power consumption is bigger.
The technical problem to be solved in the present invention is, for the drawbacks described above of prior art, there is provided a kind of optical-electric module, solution
When optical signal is larger in certainly existing opto-electronic detection scheme, very big electric current can be produced, the problem of power supply power consumption is bigger.
The technical solution adopted for the present invention to solve the technical problems is：A kind of photoelectric detective circuit, the photoelectricity are provided
Detection circuit includes Photoelectric Detection module and comparator, and the Photoelectric Detection module includes the photodiode being arranged in parallel and born
Resistance is carried, the first end ground connection of the Photoelectric Detection module, the second end of the Photoelectric Detection module and the positive of comparator are defeated
Enter end connection, and connected by the inverting input of low pass filter and comparator；The comparator according to normal phase input end and
The access signal of inverting input exports detection level signal from output end.
Wherein, preferred version is：The photoelectric detective circuit also includes unglazed detection module and enabled switch, described enabled
Switch is connected with the output end of comparator, and the unglazed detection module is arranged between Photoelectric Detection module and enabled switch；If
Unglazed detection module detects that Photoelectric Detection module has electric signal generation, controls enabled switch to open, otherwise the enabled switch of control
Close.
Wherein, preferred version is：The unglazed detection module sets a predetermined threshold value, and the unglazed detection module obtains light
The voltage magnitude of signal, and compared with predetermined threshold value, if when voltage magnitude is less than predetermined threshold value otherwise output exports without optical signal
There is optical signal.
Wherein, preferred version is：The enabled switch includes a control chip, and the control chip includes an Enable Pin,
The Enable Pin is connected with unglazed detection module, when the Enable Pin of control chip receives irrelevant signal, closes comparator
Output end；Otherwise the output end of comparator is opened.
Wherein, preferred version is：The comparator is hysteresis comparator.
The technical solution adopted for the present invention to solve the technical problems is：A kind of optical-electric module, the optical-electric module are provided
Including housing, photoelectric detective circuit and power input, the photoelectric detective circuit is arranged in housing, the Photoelectric Detection electricity
Road includes Photoelectric Detection module and comparator, and the Photoelectric Detection module includes the photodiode being arranged in parallel and load electricity
Resistance, the first end ground connection of the Photoelectric Detection module, the second end of the Photoelectric Detection module and the normal phase input end of comparator
Connection, and connected by the inverting input of low pass filter and comparator, the comparator is according to normal phase input end and anti-phase
The access signal of input exports detection level signal from output end；One end of the power input is connected with comparator, its
One end is connected with the power supply of outside.
Wherein, preferred version is：The optical-electric module also includes the transmission for being arranged on housing and being turned on enclosure interior
Optical fiber, the delivery outlet alignment photodiode of the Transmission Fibers, optical signal are exported and are transferred to from the delivery outlet of Transmission Fibers
In photodiode, the photodiode is converted into electric signal according to optical signal.
Wherein, preferred version is：The optical-electric module also includes being arranged on housing and being connected with the output end of comparator
Signal wire.
The beneficial effects of the present invention are, compared with prior art, the present invention by design a kind of photoelectric detective circuit and
Optical-electric module, for the power consumption requirements of harshness, using the photoelectric effect of photodiode, a kind of reverse biased that do not need is set
Photoelectric detective circuit, so as to reduce electric current caused by reverse biased to greatest extent, reduce power consumption；And due to not making
With bias, photodiode not from power supply extracting energy, so as to greatly reduce optical signal it is strong when the overall work(that brings
Consumption increase.
Brief description of the drawings
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing：
Fig. 1 is the structural representation of prior art opto-electronic detection scheme；
Fig. 2 is the structural representation of photoelectric detective circuit of the present invention；
Fig. 3 is the concrete structure schematic diagram of photoelectric detective circuit of the present invention.
Embodiment
In conjunction with accompanying drawing, presently preferred embodiments of the present invention is elaborated.
As shown in Fig. 2 the present invention provides a kind of preferred embodiment of photoelectric detective circuit.
A kind of photoelectric detective circuit, the photoelectric detective circuit includes Photoelectric Detection module 210 and comparator 220, described
Photoelectric Detection module 210 includes the photodiode 211 and load resistance 212 being arranged in parallel, the Photoelectric Detection module 210
First end is grounded, and the second end of the Photoelectric Detection module 210 is connected with the normal phase input end of comparator 220, and passes through low pass
Wave filter 230 is connected with the inverting input of comparator 220；The comparator 220 is according to normal phase input end and inverting input
Access signal from output end export detection level signal.
Wherein, photodiode 211 is as general-purpose diode, and the semiconductor devices being made up of a PN junction,
With one direction conductive characteristic.But it is not to make rectifier cell in circuit, but optical signal is converted into the photoelectricity of electric signal
Senser element.General-purpose diode is in cut-off state when backward voltage acts on, and can only flow through faint reverse current, photoelectricity two
Pole pipe 211 makes the area of PN junction relatively large as far as possible in design and making, to receive incident light；And photodiode 211
Worked under backward voltage effect, when not having illumination, reverse current is extremely faint, is dark current；It is reversely electric when having illumination
Stream is rapidly increased to tens microamperes, referred to as photoelectric current, and the intensity of light is bigger, and reverse current is also bigger.The change of light causes
Optical signal is converted into electric signal, turns into optoelectronic sensor by the curent change of photodiode 211, this can.
Wherein, comparator 220 is the circuit that an analog voltage signal compares with a reference voltage.Comparator
220 two-way input be analog signal, output be then binary signal 0 or 1, when input voltage difference increase or reduction and just
When minus symbol is constant, it, which is exported, keeps constant.Wherein, signal gives the inverting input of comparator 220 by low pass filter 230
There is provided one and judge reference voltage.When the signal level for the normal phase input end for being input to comparator 220 is more than inverting input
The reference voltage, then output end output the level of logic 1；Otherwise output end output logical zero level.
Wherein, low pass filter 230 be allow signal less than cut-off frequency by, but higher than cut-off frequency signal not
The electronic filtering device that can pass through.And the signal exported by low pass filter 230, quasi- flip-flop can be left, be input to
One end of comparator judges reference voltage as one.
Wherein, according to Ohm's law U=I*R, photodiode 211 produces signal code I after load resistance 212,
Produce voltage U.
Specifically, electric current is produced according to optical signal using the photoelectric effect of photodiode 211, photodiode 211, and
Electricity is streamed to the normal phase input end of comparator 220, and photodiode 211 produces electric current according to optical signal and passes through low pass
After 230 meticulous LPF of wave filter, the electricity after filtering is streamed to the inverting input of comparator 220.
Specifically, custom circuit (prior art, with reference to figure 1) is when detecting 3dBm optical signals,
Power consumption P=(2mA+0.7mA) * 3.3V=8.91mW；Wherein, 2mA is photodiode current, and 0.7mA is computing
Amplifier quiescent current.
The present embodiment photoelectric detective circuit when detecting 3dBm optical signals,
Power consumption P=0.7mA*3.3V=2.31mW；Wherein, 0.7mA is operational amplifier quiescent current.
Therefore, the present embodiment photoelectric detective circuit power consumption only has the power consumption of custom circuit 26% in theory.
As shown in figure 3, the present invention provides the preferred embodiment of a kind of unglazed detection module 240 and enabled switch 250.
The photoelectric detective circuit also includes unglazed detection module 240 and enabled switch 250, the enabled switch 250 with
The output end connection of comparator 220, the unglazed detection module 240 be arranged on Photoelectric Detection module 210 and enabled switch 250 it
Between；If unglazed detection module 240 detects that Photoelectric Detection module 210 has electric signal generation, enabled switch 250 is controlled to open, instead
The enabled switch 250 of control close.
Wherein, the unglazed detection module 240 is by the voltage amplitude of detection signal light, when less than the threshold value of setting,
Then it is considered unglazed.A kind of embodiment is by comparator and enabled switch.Specifically, the unglazed detection module 240 is set
A predetermined threshold value is put, the unglazed detection module 240 obtains the voltage magnitude of optical signal, and compared with predetermined threshold value, if voltage
Output has optical signal without optical signal, otherwise output when amplitude is less than predetermined threshold value.
Wherein, the enabled switch 250 includes a control chip, and the control chip includes an Enable Pin, described enabled
End is connected with unglazed detection module 240, when the Enable Pin of control chip receives irrelevant signal, closes the output of comparator
End；Otherwise the output end of comparator is opened
In the present embodiment, the comparator 220 is hysteresis comparator 220, and hysteresis comparator 220, which is one, has sluggishness
The comparator 220 of winding transmission characteristic.Positive feedback network is introduced on the basis of anti-phase input simple gate voltage limit comparator 220,
Just constitute the anti-phase input hysteresis comparator 220 with two-door limit value.Due to the thresholding of this comparator 220 of effect of feedback
Voltage is changed with the change of output voltage.Its sensitivity is lower, but antijamming capability greatly improves.
And be used in combination by hysteresis comparator 220 with unglazed detection module 240 and enabled switch 250, further carry
Height judges photoelectric conversion judgement.
In the present invention, there is provided a kind of preferred embodiment of optical-electric module.
A kind of optical-electric module, the optical-electric module include housing, photoelectric detective circuit and power input, the photoelectricity inspection
Slowdown monitoring circuit is arranged in housing, and the photoelectric detective circuit includes Photoelectric Detection module 210 and comparator 220, the photoelectricity inspection
Survey photodiode 211 and load resistance 212 that module 210 includes being arranged in parallel, the first end of the Photoelectric Detection module 210
Ground connection, the second end of the Photoelectric Detection module 210 is connected with the normal phase input end of comparator 220, and passes through low pass filter
230 are connected with the inverting input of comparator 220, and the comparator 220 is according to the access of normal phase input end and inverting input
Signal exports detection level signal from output end；One end of the power input is connected with comparator 220, its one end and outside
Power supply connection.
Wherein, Photoelectric Detection module 210 belongs to the part that optical signal is converted to electric signal in optical-electric module, detects
The processor for inputting rear end is done further digital operation and handled by electric signal.OSC(Optical Supervisory
Channel) it is a special wavelength of optical signal in optical communication network.
In the present embodiment, the optical-electric module also includes the transmission light for being arranged on housing and being turned on enclosure interior
Fibre, the delivery outlet alignment photodiode 211 of the Transmission Fibers, optical signal are exported and are transferred to from the delivery outlet of Transmission Fibers
In photodiode 211, the photodiode 211 is converted into electric signal according to optical signal.
In the present embodiment, the optical-electric module also includes being arranged on housing and being connected with the output end of comparator 220
Signal wire.
As described above, only preferred embodiment is not intended to limit the scope of the present invention, Fan Yibenfa
The equivalent change or modification that bright claim is made, it is all that the present invention is covered.
Claims (8)
- A kind of 1. photoelectric detective circuit, it is characterised in that：The photoelectric detective circuit includes Photoelectric Detection module and comparator, institute State photodiode and load resistance that Photoelectric Detection module includes being arranged in parallel, the first termination of the Photoelectric Detection module Ground, the second end of the Photoelectric Detection module and the normal phase input end of comparator connect, and pass through low pass filter and comparator Inverting input connection；The comparator is exported from output end according to the access signal of normal phase input end and inverting input and examined Survey level signal.
- 2. photoelectric detective circuit according to claim 1, it is characterised in that：The photoelectric detective circuit also includes unglazed inspection Module and enabled switch are surveyed, the enabled switch is connected with the output end of comparator, and the unglazed detection module is arranged on photoelectricity Between detection module and enabled switch；If unglazed detection module detects that Photoelectric Detection module has electric signal generation, control enables Switch is opened, otherwise the enabled switch of control is closed.
- 3. photoelectric detective circuit according to claim 2, it is characterised in that：The unglazed detection module sets a default threshold Value, the unglazed detection module obtain the voltage magnitude of optical signal, and compared with predetermined threshold value, if voltage magnitude is less than default threshold Output has optical signal without optical signal, otherwise output during value.
- 4. photoelectric detective circuit according to claim 3, it is characterised in that：The enabled switch includes a control chip, The control chip includes an Enable Pin, and the Enable Pin is connected with unglazed detection module, when the Enable Pin of control chip receives During to irrelevant signal, the output end of comparator is closed；Otherwise the output end of comparator is opened.
- 5. Photoelectric Detection electricity according to claim 1 or 2, it is characterised in that：The comparator is hysteresis comparator.
- A kind of 6. optical-electric module, it is characterised in that：The optical-electric module includes housing, photoelectric detective circuit and power input, The photoelectric detective circuit is arranged in housing, and the photoelectric detective circuit includes Photoelectric Detection module and comparator, the light Electro-detection module includes the photodiode and load resistance being arranged in parallel, the first end ground connection of the Photoelectric Detection module, institute State the second end of Photoelectric Detection module and the normal phase input end of comparator connects, and pass through the anti-phase of low pass filter and comparator Input connects, and the comparator exports detection level according to the access signal of normal phase input end and inverting input from output end Signal；One end of the power input is connected with comparator, and its one end is connected with the power supply of outside.
- 7. optical-electric module according to claim 6, it is characterised in that：The optical-electric module also includes being arranged on housing simultaneously The Transmission Fibers turned on enclosure interior, the delivery outlet alignment photodiode of the Transmission Fibers, optical signal is from Transmission Fibers Delivery outlet export and be transferred in photodiode, the photodiode is converted into electric signal according to optical signal.
- 8. photoelectric detective circuit according to claim 7, it is characterised in that：The optical-electric module also includes being arranged on housing Signal wire that is upper and being connected with the output end of comparator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710867837.XA CN107566047A (en) | 2017-09-22 | 2017-09-22 | A kind of photoelectric detective circuit and optical-electric module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710867837.XA CN107566047A (en) | 2017-09-22 | 2017-09-22 | A kind of photoelectric detective circuit and optical-electric module |
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| Publication Number | Publication Date |
|---|---|
| CN107566047A true CN107566047A (en) | 2018-01-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710867837.XA Pending CN107566047A (en) | 2017-09-22 | 2017-09-22 | A kind of photoelectric detective circuit and optical-electric module |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN113624338A (en) * | 2021-08-23 | 2021-11-09 | 深圳市杰芯创电子科技有限公司 | Photoelectric detection chip and method for smart home |
-
2017
- 2017-09-22 CN CN201710867837.XA patent/CN107566047A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN113624338A (en) * | 2021-08-23 | 2021-11-09 | 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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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. |