CN106532635A - Apd protection circuit - Google Patents
Apd protection circuit Download PDFInfo
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- CN106532635A CN106532635A CN201610995831.6A CN201610995831A CN106532635A CN 106532635 A CN106532635 A CN 106532635A CN 201610995831 A CN201610995831 A CN 201610995831A CN 106532635 A CN106532635 A CN 106532635A
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- apd
- circuit
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- outfan
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
- H02H3/32—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
- H02H3/325—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors involving voltage comparison
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Abstract
The invention relates to an APD protection circuit. The APD protection circuit comprises a power supply circuit, a current sampling circuit and a determining circuit, wherein the power supply circuit is accessed to bias voltages through a protection switch and is used for providing driving currents for an APD, the current sampling circuit is used for sampling the driving currents of the APD and outputting sampling currents or sampling voltages to the determining circuit, and the determining circuit is used for controlling the protection switch to be switched off when the sampling currents or the sampling voltages obtained through sampling exceed a set threshold. According to the APD protection circuit provided by the embodiments of the invention, working voltages of the APD are sampled through the sampling circuit, the determining circuit compares the sampling currents or the sampling voltages obtained through converting the sampling currents with the set threshold, when the sampling currents or the sampling voltages exceed the set threshold, the bias voltages are disconnected, and the APD is enabled to stop working, such that the APD can be effectively protected and the damage probability is reduced. The APD protection circuit is reasonable in design, simple in structure, easy to realize and low in cost.
Description
Technical field
The present invention relates to APD technical fields, more particularly to a kind of APD protection circuits.
Background technology
Avalanche photodide（Avalanche Photo Diode, abbreviation APD）It is the photosensitive unit commonly used in laser communication
Part.APD can cause to damage in life-time service, and usual APD is damaged to be caused by energy accumulation, i.e. P=I * t.If in pole
In short time, APD response currents are captured more than certain limit, and close bias voltage immediately（Vapd）, then APD can be realized
Hardware protection.
The content of the invention
It is an object of the invention to provide a kind of APD protection circuits, cause to damage during life-time service to improve APD
Problem.
In order to realize foregoing invention purpose, technical scheme below is embodiments provided：
A kind of APD protection circuits, including power circuit, current sampling circuit and decision circuit；Wherein,
The power circuit, its input access bias voltage, outfan and the current sampling circuit by a protection switch
It is connected, for providing driving current for APD；
The current sampling circuit, its input are connected with the power circuit, and outfan is connected with the decision circuit, is used for
The driving current of equal proportion sampling APD, and the sampling electricity that the sample rate current that obtains of sampling or the sample rate current are converted to
Pressure output is to the decision circuit；
The decision circuit, its input are connected with the current sampling circuit, and outfan is connected with the protection switch, is used for
When the sample rate current is detected or the sampled voltage exceedes default threshold value, disconnection control signal is provided to control
State protection switch disconnection.
Used as a kind of embodiment, the power circuit includes mirror current source, and the input of the mirror current source is
The input of the power circuit, a current output terminal of the mirror current source are used for connecting the APD to provide driving
Electric current, another current output terminal of the mirror current source are the outfan of the power circuit, export institute for equal proportion
Driving current is stated to the current sampling circuit.
As a kind of embodiment, driving current of the current sampling circuit for the APD that samples, and will sample what is obtained
Sample rate current is converted to sampled voltage and exports to the decision circuit；The decision circuit, for detecting the sampling electricity
When pressure is more than default threshold value, provides disconnection control signal and disconnected with controlling the protection switch.
Used as a kind of embodiment, the current sampling circuit includes operational amplifier, first resistor, the first electric capacity；
The input of the operational amplifier is the input of the current sampling circuit, and the outfan of the operational amplifier is
The outfan of the current sampling circuit；
The first resistor and first electric capacity compose in parallel the first parallel branch, one end connection of first parallel branch
The input of the operational amplifier, the other end connect the outfan of the operational amplifier.
Used as another embodiment, the current sampling circuit includes second resistance and the second electric capacity, and described second is electric
Resistance and second electric capacity compose in parallel the second parallel branch, one end of second parallel branch respectively with the power circuit
Outfan, the decision circuit input connection, the other end ground connection.
Used as a kind of embodiment, the decision circuit includes comparator and the first d type flip flop, the input of the comparator
The input for the decision circuit is held, the outfan of first d type flip flop is the outfan of the decision circuit, the ratio
Connect the input of first d type flip flop compared with the outfan of device.
Used as another embodiment, the decision circuit includes the second d type flip flop, the input of second d type flip flop
The input for the decision circuit is held, the outfan of second d type flip flop is the outfan of the decision circuit.
APD protection circuits provided in an embodiment of the present invention, by the operating current of sampling circuit samples APD, decision circuit
The sampled voltage that sample rate current or sample rate current are converted to is compared with setting threshold value, when more than setting threshold value
Disconnect bias voltage so that APD quits work, and can effectively protect APD, reduce the probability of its damage.APD protections of the present invention
Circuit design is reasonable, simple structure, it is easy to accomplish, and it is with low cost.
Description of the drawings
In order to be illustrated more clearly that the technical scheme of the embodiment of the present invention, below by to be used attached needed for embodiment
Figure is briefly described, it will be appreciated that the following drawings illustrate only certain embodiments of the present invention, thus be not construed as it is right
The restriction of scope, for those of ordinary skill in the art, on the premise of not paying creative work, can be with according to this
A little accompanying drawings obtain other related accompanying drawings.
Fig. 1 is the schematic diagram of the APD protection circuits that the embodiment of the present invention 1 is provided.
Fig. 2 is the schematic diagram of the APD protection circuits that the embodiment of the present invention 2 is provided.
Fig. 3 is the schematic diagram of the APD protection circuits that the embodiment of the present invention 3 is provided.
Fig. 4 is the schematic diagram of the APD protection circuits that the embodiment of the present invention 4 is provided.
Main element symbol description
Power circuit 10；Current sampling circuit 20；Decision circuit 30.
Specific embodiment
A kind of APD protection circuits are embodiments provided, including power circuit, current sampling circuit and judgement electricity
Road；Wherein, the power circuit, its input access bias voltage, outfan and the current sample by a protection switch
Circuit is connected, for providing driving current for APD.
In one embodiment, the current sampling circuit, its input are connected with the power circuit, outfan with
The decision circuit is connected, and for the driving current of equal proportion sampling APD, and the sample rate current that sampling is obtained is exported to described
Decision circuit；
The decision circuit, its input are connected with the current sampling circuit, and outfan is connected with the protection switch, is used for
Relatively the sample rate current and default threshold value, when the sample rate current is detected more than default threshold value, provide disconnected
Open control signal and disconnected with controlling the protection switch, when the sample rate current being detected not less than default threshold value, give
Go out to connect control signal to control the protection switch connection.
In another embodiment, the current sampling circuit, its input are connected with the power circuit, outfan
It is connected with the decision circuit, for the driving current of equal proportion sampling APD, and the sample rate current obtained sampling is converted to and is adopted
Sample voltage output gives the decision circuit；
The decision circuit, its input are connected with the current sampling circuit, and outfan is connected with the protection switch, is used for
Compare the sampled voltage and default threshold value（It is easy to understand, for voltage ratio compared with threshold value with compare for electric current
Threshold value it is different, voltage threshold is converted to by current threshold）, the sampled voltage is being detected more than default door
During limit value, provide disconnection control signal and disconnected with controlling the protection switch, during not less than default threshold value, provide connection control
Signal processed is connected with controlling the protection switch.
Below in conjunction with accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Ground description, it is clear that described embodiment is only a part of embodiment of the invention, rather than the embodiment of whole.Generally exist
The component of the embodiment of the present invention described and illustrated in accompanying drawing can be arranged and be designed with a variety of configurations herein.Cause
This, the detailed description of the embodiments of the invention to providing in the accompanying drawings is not intended to limit claimed invention below
Scope, but it is merely representative of the selected embodiment of the present invention.Based on embodiments of the invention, those skilled in the art are not doing
The every other embodiment obtained on the premise of going out creative work, belongs to the scope of protection of the invention.
Embodiment 1
Fig. 1 shows the schematic diagram of the APD protection circuits that the present embodiment is provided.Fig. 1 is referred to, the APD that the present embodiment is provided is protected
Protection circuit includes power circuit 10, current sampling circuit 20 and decision circuit 30.Wherein,
Power circuit 10 includes mirror current source, and the input of the mirror current source is the input of the power circuit 10,
Which accesses bias voltage by protection switch, and a current output terminal for defining the mirror current source is exported for driving current
End, another current output terminal are sample rate current outfan, and the driving current outfan is used for connecting the APD, to carry to APD
For driving current, sample rate current outfan is the outfan of the power circuit 10, exports the driving current for equal proportion
To the current sampling circuit 20.
Current sampling circuit 20 includes operational amplifier, electric capacity C1 and resistance R1, and the "-" input of operational amplifier is electricity
The input of stream sample circuit 20, connects the sample rate current outfan of mirror current source, and electric capacity C1 and resistance R1 compose in parallel the
One parallel branch, one end of the first parallel branch connect the "-" input of the operational amplifier, and the other end connects the computing
The outfan of amplifier.Outfan of the outfan of operational amplifier for current sampling circuit 20.
Decision circuit 30 includes comparator and the first d type flip flop D1, and the "+" input of comparator is the defeated of decision circuit 30
Enter end, the outfan of concatenation operation amplifier, the "-" input connection reference voltage of comparator, the outfan connection of comparator
The input of the first d type flip flop D1, the outfan of the first d type flip flop D1 is the outfan of decision circuit 30, connects protection switch.
Mirror current source provides driving current for APD, while providing sample rate current, sample rate current for current sampling circuit 20
Proportional to driving current, sample rate current Jing resistance R1 are converted to sampled voltage and export to comparator, and comparator is by sampled voltage
Be compared with default threshold value, if sampled voltage is more than threshold value, export and control signal is disconnected to protection switch, with
Protection switch is disconnected, and is made mirror current source stop driving current being provided for APD so that APD quits work, is realized protection APD's
Purpose；, whereas if sampled voltage is less than or equal to threshold value, then connection control signal is exported to protection switch, so that protection is opened
Continue to be held in pass.
Embodiment 2
Fig. 2 shows the schematic diagram of the APD protection circuits that the present embodiment is provided.Fig. 2 is referred to, the APD that the present embodiment is provided is protected
Protection circuit includes power circuit 10, current sampling circuit 20 and decision circuit 30.Wherein,
Power circuit 10 includes mirror current source, and the input of the mirror current source is the input of the power circuit 10,
Which accesses bias voltage by protection switch, and a current output terminal for defining the mirror current source is exported for driving current
End, another current output terminal are sample rate current outfan, and the driving current outfan is used for connecting the APD, to carry to APD
For driving current, sample rate current outfan is the outfan of the power circuit 10, exports the driving current for equal proportion
To the current sampling circuit 20.
Current sampling circuit 20 includes operational amplifier, electric capacity C1 and resistance R1, and the "-" input of operational amplifier is electricity
The input of stream sample circuit 20, connects the sample rate current outfan of mirror current source, and electric capacity C1 and resistance R1 compose in parallel the
One parallel branch, one end of the first parallel branch connect the "-" input of the operational amplifier, and the other end connects the computing
The outfan of amplifier.Outfan of the outfan of operational amplifier for current sampling circuit 20.
Decision circuit 30 includes the second d type flip flop D2, and the input of the second d type flip flop D2 is the input of decision circuit 30
End, the outfan of concatenation operation amplifier, the outfan of the second d type flip flop D2 is the outfan of decision circuit 30, connects protection
Switch.
Mirror current source provides driving current for APD, while providing sample rate current, sample rate current for current sampling circuit 20
Proportional to driving current, sample rate current Jing resistance R1 are converted to sampled voltage and export to the second d type flip flop D2, the 2nd D triggerings
Sampled voltage is compared by device D2 with default threshold value, if sampled voltage is more than threshold value, output disconnects control letter
Number give protection switch, to disconnect protection switch, make mirror current source stop provide driving current for APD so that APD stopping work
Make, realize the purpose of protection APD；, whereas if sampled voltage is less than or equal to threshold value, then connection control signal is exported to protection
Switch, so that protection switch continues to be held on.
In the present embodiment, directly judgement is compared using the TTL logic thresholds of d type flip flop, instead of making for comparator
With, hardware cost is on the one hand reduced, another aspect has also been simplified circuit structure, has reduced PCB area.
Embodiment 3
Fig. 3 shows the schematic diagram of the APD protection circuits that the present embodiment is provided.Fig. 3 is referred to, the APD that the present embodiment is provided is protected
Protection circuit includes power circuit 10, current sampling circuit 20 and decision circuit 30.Wherein,
Power circuit 10 includes mirror current source, and the input of the mirror current source is the input of the power circuit 10,
Which accesses bias voltage by protection switch, and a current output terminal for defining the mirror current source is exported for driving current
End, another current output terminal are sample rate current outfan, and the driving current outfan is used for connecting the APD, to carry to APD
For driving current, sample rate current outfan is the outfan of the power circuit 10, exports the driving current for equal proportion
To the current sampling circuit 20.
Current sampling circuit 20 includes that electric capacity C2 and resistance R2, electric capacity C2 and resistance R2 compose in parallel the second parallel branch,
One end ground connection of the second parallel branch, the sample rate current outfan of other end connection mirror current source, the input of decision circuit 30
End.
Decision circuit 30 includes comparator and the first d type flip flop D1, and the "+" input of comparator is the defeated of decision circuit 30
Enter end, connect the outfan of the second parallel branch, the "-" input connection reference voltage of comparator, the outfan of comparator connect
The input of the first d type flip flop D1 is connect, the outfan of the first d type flip flop D1 is the outfan of decision circuit 30, connects protection and opens
Close.
Mirror current source provides driving current for APD, while providing sample rate current, sample rate current for current sampling circuit 20
Proportional to driving current, sample rate current Jing resistance R2 are converted to sampled voltage and export to comparator, and comparator is by sampled voltage
Be compared with default threshold value, if sampled voltage is more than threshold value, export and control signal is disconnected to protection switch, with
Protection switch is disconnected, and is made mirror current source stop driving current being provided for APD so that APD quits work, is realized protection APD's
Purpose；, whereas if sampled voltage is less than or equal to threshold value, then connection control signal is exported to protection switch, so that protection is opened
Continue to be held in pass.
In the present embodiment, current sampling circuit 20 reduces computing compared to the embodiment in embodiment 1, embodiment 2
The use of amplifier, not only reduces hardware cost, also simplify circuit structure.
Embodiment 4
Fig. 4 shows the schematic diagram of the APD protection circuits that the present embodiment is provided.Fig. 4 is referred to, the APD that the present embodiment is provided is protected
Protection circuit includes power circuit 10, current sampling circuit 20 and decision circuit 30.Wherein,
Power circuit 10 includes mirror current source, and the input of the mirror current source is the input of the power circuit 10,
Which accesses bias voltage by protection switch, and a current output terminal for defining the mirror current source is exported for driving current
End, another current output terminal are sample rate current outfan, and the driving current outfan is used for connecting the APD, to carry to APD
For driving current, sample rate current outfan is the outfan of the power circuit 10, exports the driving current for equal proportion
To the current sampling circuit 20.
Current sampling circuit 20 includes that electric capacity C2 and resistance R2, electric capacity C2 and resistance R2 compose in parallel the second parallel branch,
One end ground connection of the second parallel branch, the sample rate current outfan of other end connection mirror current source, the input of decision circuit 30
End.
Decision circuit 30 includes the second d type flip flop D2, and the input of the second d type flip flop D2 is the input of decision circuit 30
End, connects the outfan of the second parallel branch, and the outfan of the second d type flip flop D2 is the outfan of decision circuit 30, connects and protects
Shield switch.
Mirror current source provides driving current for APD, while providing sample rate current, sample rate current for current sampling circuit 20
Proportional to driving current, sample rate current Jing resistance R2 are converted to sampled voltage and export to the second d type flip flop D2, the 2nd D triggerings
Sampled voltage is compared by device D2 with default threshold value, if sampled voltage is more than threshold value, output disconnects control letter
Number give protection switch, to disconnect protection switch, make mirror current source stop provide driving current for APD so that APD stopping work
Make, realize the purpose of protection APD；, whereas if sampled voltage is less than or equal to threshold value, then connection control signal is exported to protection
Switch, so that protection switch continues to be held on.
In the present embodiment, compared to embodiment 3 in the circuit structure, reduce further hardware cost, simplify
Circuit structure.
In order to ensure that APD is injury-free, more preferably, when sampled voltage/electric current exceedes threshold value, even if in the short time
APD works on the damage that be also unlikely to.Some special application scenarios are directed to, sampled voltage/electric current may be worked as more than thresholding
During value, it is also desirable to continue to keep work in the APD short time.Supplement accordingly, as a kind of, in any of the above-described embodiment, APD protections
Circuit can also include MCU, MCU respectively with protection switch, first（Or second）D type flip flop is connected.MCU is enabled when needed,
The state of protection switch is detected by MCU, connection control signal is exported when protection switch is off to first（Or the
Two）D type flip flop, to control protection switch connection.
The above, the only specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, any
Those familiar with the art the invention discloses technical scope in, change or replacement can be readily occurred in, should all be contained
Cover within protection scope of the present invention.Therefore, protection scope of the present invention described should be defined by scope of the claims.
Claims (9)
1. a kind of APD protection circuits, it is characterised in that including power circuit, current sampling circuit and decision circuit；Wherein,
The power circuit, its input access bias voltage, outfan and the current sampling circuit by a protection switch
It is connected, for providing driving current for APD；
The current sampling circuit, its input are connected with the power circuit, and outfan is connected with the decision circuit, is used for
The driving current of equal proportion sampling APD, and the sampling electricity that the sample rate current that obtains of sampling or the sample rate current are converted to
Pressure output is to the decision circuit；
The decision circuit, its input are connected with the current sampling circuit, and outfan is connected with the protection switch, is used for
When the sample rate current is detected or the sampled voltage exceedes default threshold value, disconnection control signal is provided to control
State protection switch disconnection.
2. APD protection circuits according to claim 1, it is characterised in that the power circuit includes mirror current source, institute
The input for stating mirror current source is the input of the power circuit, and a current output terminal of the mirror current source is used for
Connect the APD to provide driving current, another current output terminal of the mirror current source is the defeated of the power circuit
Go out end, the driving current is exported to the current sampling circuit for equal proportion.
3. APD protection circuits according to claim 2, it is characterised in that the current sampling circuit is used for sampling APD's
Driving current, and the sample rate current that obtains of sampling is converted to into sampled voltage exports to the decision circuit；The decision circuit,
For when the sampled voltage is detected more than default threshold value, providing disconnection control signal to control the protection switch
Disconnect.
4. APD protection circuits according to claim 3, it is characterised in that the current sampling circuit includes operation amplifier
Device, first resistor, the first electric capacity；
The input of the operational amplifier is the input of the current sampling circuit, and the outfan of the operational amplifier is
The outfan of the current sampling circuit；
The first resistor and first electric capacity compose in parallel the first parallel branch, one end connection of first parallel branch
The input of the operational amplifier, the other end connect the outfan of the operational amplifier.
5. APD protection circuits according to claim 3, it is characterised in that the current sampling circuit includes second resistance
With the second electric capacity, the second resistance and second electric capacity composes in parallel the second parallel branch, second parallel branch
One end outfan respectively with the power circuit, the input of the decision circuit are connected, other end ground connection.
6. APD protection circuits according to claim 4 or 5, it is characterised in that the decision circuit includes comparator and
One d type flip flop, the input of the comparator are the input of the decision circuit, and the outfan of first d type flip flop is
The outfan of the decision circuit, the outfan of the comparator connect the input of first d type flip flop.
7. APD protection circuits according to claim 4 or 5, it is characterised in that the decision circuit includes that the 2nd D is triggered
Device, the input of second d type flip flop is the input of the decision circuit, and the outfan of second d type flip flop is institute
State the outfan of decision circuit.
8. APD protection circuits according to claim 7, it is characterised in that the APD protection circuits also include MCU, described
MCU is connected with the protection switch, second d type flip flop respectively, for detecting the state of the protection switch, in the guarantor
Shield switch exports connection control signal to second d type flip flop when being off, to control the protection switch connection.
9. APD protection circuits according to claim 6, it is characterised in that the APD protection circuits also include MCU, described
MCU is connected with the protection switch, first d type flip flop respectively, for detecting the state of the protection switch, in the guarantor
Shield switch exports connection control signal to first d type flip flop when being off, to control the protection switch connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610995831.6A CN106532635B (en) | 2016-11-11 | 2016-11-11 | APD protects circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610995831.6A CN106532635B (en) | 2016-11-11 | 2016-11-11 | APD protects circuit |
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| CN106532635A true CN106532635A (en) | 2017-03-22 |
| CN106532635B CN106532635B (en) | 2019-06-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610995831.6A Active CN106532635B (en) | 2016-11-11 | 2016-11-11 | APD protects circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114415150A (en) * | 2021-12-27 | 2022-04-29 | 重庆九洲星熠导航设备有限公司 | Laser radar APD protection method and device, storage medium and laser radar system |
| CN116191381A (en) * | 2023-02-02 | 2023-05-30 | 武汉莱创德技术有限公司 | System and method for protecting APD corresponding to transient high light |
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| Publication number | Publication date |
|---|---|
| CN106532635B (en) | 2019-06-28 |
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