CN109217272A - A kind of APD optical module and its protection circuit and guard method - Google Patents
A kind of APD optical module and its protection circuit and guard method Download PDFInfo
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- CN109217272A CN109217272A CN201811320162.8A CN201811320162A CN109217272A CN 109217272 A CN109217272 A CN 109217272A CN 201811320162 A CN201811320162 A CN 201811320162A CN 109217272 A CN109217272 A CN 109217272A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
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Abstract
The invention discloses a kind of protection circuits of APD optical module, comprising: current sampling circuit is sent to control unit for obtaining the current value exported by transforming circuit output end, and by current value；The control unit being connect with current sampling circuit, for when judging that currently received current value is more than or equal to preset first current threshold, output to control signal；First end is connect with the input terminal of APD tube core, second end ground connection, the shunt circuit that control terminal is connect with control unit, for itself first end to be connected with second end after receiving control signal, the voltage that transforming circuit acts on APD tube core is reduced, to reduce the electric current of APD tube core.Using the solution of the present invention, the damage as caused by overcurrent of APD tube core can be effectively protected.The invention also discloses a kind of APD optical module and its guard methods, have corresponding effect.
Description
Technical field
The present invention relates to optical module technical fields, more particularly to a kind of APD optical module and its protection circuit and protection side
Method.
Background technique
Optical module is during test or practical application, it is understood that there may be limit test condition or artificial mistake behaviour
The case where making, strong light be incident on optical module receiving end, when optical module is APD (avalanche photodiode, avalanche optoelectronic
Diode) optical module when, biggish photoelectric current can be generated.And when the photoelectric current generated is more than the permitted maximum electricity of APD tube core
When stream, APD tube core will be damaged.
Current limiting would generally be arranged in existing APD optical module in destruction in order to avoid excessive photoelectric current to APD tube core
Resistance, after the output end of DC-DC circuit increases current-limiting resistance, when strong light is incident on optical module, due to point of current-limiting resistance
Pressure, the bias that DC-DC circuit can be made to act on APD tube core reduces, so that the gain reduction of APD tube core, reaches and subtract
The purpose of low current.But such scheme can only avoid the damage of APD tube core, in the occasion of part, example to a certain extent
In the occasions such as such as excessively high in the bias of DC-DC circuit output, intensity of illumination is excessive, and the permitted maximum exchange of APD tube core is smaller,
Electric current in APD tube core still can exceed that permitted maximum current, cause damage namely the APD optical module of APD tube core
Damage.
In conclusion how further to avoid APD tube core damage as caused by overcurrent in APD optical module, it is
Those skilled in the art's technical problem urgently to be solved at present.
Summary of the invention
The object of the present invention is to provide a kind of APD optical module and its protection circuit and guard methods, to be effectively prevented from APD
APD tube core in optical module is damaged as caused by overcurrent.
In order to solve the above technical problems, the invention provides the following technical scheme:
A kind of protection circuit of APD optical module, comprising:
Current sampling circuit is sent for obtaining the current value exported by transforming circuit output end, and by the current value
To control unit；
The described control unit being connect with the current sampling circuit, for judging the currently received current value
When more than or equal to preset first current threshold, output control signal；
First end is connect with the input terminal of avalanche photodide APD tube core, second end ground connection, control terminal and the control
The shunt circuit of unit connection is reduced for itself first end to be connected with second end after receiving the control signal
The transforming circuit acts on the voltage of the APD tube core, to reduce the electric current of the APD tube core.
Preferably, the current sampling circuit is specifically used for: obtaining according to the default sampling period by transforming circuit output end
The current value of output, and the current value is sent to control unit；
Described control unit is also used to: by the sampling period, the current value that currently obtains and preceding once being obtained
The current value taken, calculates current changing rate；When judge the current changing rate be more than or equal to preset change rate threshold
When value, the control signal is exported.
Preferably, described control unit is also used to: according to the current value and the calculated electricity currently obtained
Rheology rate calculates the target current value after the first duration, when the target current value is more than or equal to preset second electricity
When flowing threshold value, the control signal is exported.
Preferably, the size of second current threshold is equal to the size of first current threshold, first duration
Size be equal to the sampling period size.
Preferably, the current sampling circuit specifically includes:
First end and the first end of current-limiting resistance connect, and common end is connect with the output end of the transforming circuit, and second
Hold the first resistor connecting with the first end of second resistance；
The second resistance of second end ground connection；
First end is connect with the second end of the current-limiting resistance, the third electricity that second end is connect with the first end of the 4th resistance
Resistance；
The 4th resistance of second end ground connection；
First input end is connect with the second end of the first resistor, the second end of the second input terminal and the 3rd resistor
Connection, the AD conversion unit that output end is connect with described control unit, first end and second end for obtaining itself are adopted
The voltage value that sample arrives, and by the resistance value of the first resistor, the resistance value of the second resistance, the resistance value of the 3rd resistor,
The resistance value of 4th resistance and the resistance value of the current-limiting resistance, calculate the current value for flowing through the current-limiting resistance, as
The current value exported by the transforming circuit output end got, and the current value is sent to described control unit.
Preferably, the shunt circuit specifically includes:
First end is connect with the input terminal of the APD tube core, as the first end of the shunt circuit, second end and switch
The shunt resistance of the first end connection of device；
Control terminal is connect with described control unit, as the control terminal of the shunt circuit, second end ground connection, as described
The switching device of the second end of shunt circuit, for after receiving the control signal by itself first end and second
End conducting, reduces the voltage that the transforming circuit acts on the APD tube core, to reduce the electric current of the APD tube core.
Preferably, the switching device is metal-oxide-semiconductor.
Preferably, further includes:
The display device being connect with described control unit, be currently received for real-time display described control unit described in
Current value.
A kind of guard method of APD optical module, comprising:
Current sampling circuit obtains the current value exported by transforming circuit output end, and the current value is sent to control
Unit；
Described control unit judge the currently received current value be more than or equal to preset first current threshold when,
Output control signal；
Itself first end is connected with second end after receiving the control signal for shunt circuit, reduces the transformation
Circuit function is in the voltage of APD tube core, to reduce the electric current of the APD tube core.
A kind of APD optical module, the protection circuit including APD optical module described in any of the above embodiments.
Using technical solution provided by the embodiment of the present invention, comprising: current sampling circuit, for obtaining by transforming circuit
The current value of output end output, and current value is sent to control unit；The control unit connecting with current sampling circuit, is used for
When judging that currently received current value is more than or equal to preset first current threshold, output control signal；First end and snow
The input terminal of avalanche photo diode APD tube core connects, and second end ground connection, the shunt circuit that control terminal is connect with control unit is used
In itself first end is connected with second end after receiving control signal, the electricity that transforming circuit acts on APD tube core is reduced
Pressure, to reduce the electric current of APD tube core.
In the scheme of the application, when control unit judges that currently received current value is more than or equal to preset first electric current
When threshold value, illustrates that the electric current in APD tube core at this time is excessively high, APD tube core may be damaged, therefore, control unit output
Control signal.After shunt circuit receives control signal, the first end of itself can be connected with second end, after conducting
The voltage that transforming circuit acts on APD tube core is reduced, so that the gain reduction of APD tube core, and at the same time convertor circuit can
Play the role of shunting.Since the scheme of the application and the size of incident light are unrelated, as long as detecting that current value is excessive, will pass through
Shunt circuit limits the electric current of APD tube core, and the scheme of the application is allowed to be effectively protected APD tube core since overcurrent causes
Damage.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is a kind of structural schematic diagram of the protection circuit of APD optical module in the present invention；
Fig. 2 is another structural schematic diagram of the protection circuit of APD optical module in the present invention；
Fig. 3 is a kind of implementation flow chart of the guard method of APD optical module in the present invention.
Specific embodiment
Core of the invention is to provide a kind of protection circuit of APD optical module, can be effectively protected APD tube core due to mistake
It is damaged caused by electric current.
In order to enable those skilled in the art to better understand the solution of the present invention, with reference to the accompanying drawings and detailed description
The present invention is described in further detail.Obviously, described embodiments are only a part of the embodiments of the present invention, rather than
Whole embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creative work premise
Under every other embodiment obtained, shall fall within the protection scope of the present invention.
Referring to FIG. 1, Fig. 1 is a kind of structural schematic diagram of the protection circuit of APD optical module, protection circuit in the present invention
Include:
Current sampling circuit 10 is sent to for obtaining the current value exported by transforming circuit output end, and by current value
Control unit 20；
The sampled point of current sampling circuit 10 be generally arranged at transforming circuit output end and APD tube core input terminal it
Between, it can be directly acquisition current signal, be also possible to collection voltages signal and be reconverted into the corresponding magnitude of current, have no effect on this
The implementation of invention.And it should be noted that due to being provided with the shunt circuit in parallel with APD tube core in the scheme of the application
30, and when APD optical module works normally, shunt circuit 30 is simultaneously not turned on, that is, is considered as open-circuit condition, therefore current sample at this time
The current value for the transforming circuit output end output that circuit 10 is got, that is, transforming circuit are input to the current value of APD tube core.
Transforming circuit is usually DC-DC booster circuit, and specific boosting amplitude can be set according to actual needs.?
Fig. 2 shows a kind of specific embodiment in, current sampling circuit 10 specifically includes:
First end is connect with the first end of current-limiting resistance R, the connection of the output end of common end and transforming circuit, second end with
The first resistor R1 of the first end connection of second resistance R2；
The second resistance R2 of second end ground connection；
First end is connect with the second end of current-limiting resistance R, the third electricity that second end is connect with the first end of the 4th resistance R4
Hinder R3；
4th resistance R4 of second end ground connection；
First input end is connect with the second end of first resistor R1, and the second end of the second input terminal and 3rd resistor R3 connect
It connects, the AD conversion unit 11 that output end is connect with control unit 20, the first end and second end for obtaining itself sample
The voltage value arrived, and pass through the resistance value of first resistor R1, the resistance value of second resistance R2, the resistance value of 3rd resistor R3, the 4th resistance
The resistance value of R4 and the resistance value of current-limiting resistance R, calculate the current value for flowing through current-limiting resistance R, electric by transformation as what is got
The current value of road output end output, and current value is sent to control unit 20.
In this kind of embodiment, it is contemplated that APD optical module usually can all be provided with current-limiting resistance R and APD die series, because
This can calculate the current value for flowing through current-limiting resistance R, the current value i.e. transformation electricity by the voltage of acquisition current-limiting resistance R
The current value of road output end output.And in view of the voltage exported due to transforming circuit is usually higher, the scheme of the application is just
It is divided using first resistor R1, second resistance R2,3rd resistor R3 and the 4th resistance R4, so as to AD conversion unit 11
Signal sampling.
The voltage of the collected first end of AD conversion unit 11 is C point voltage UC, with A point voltage UABetween conversion
Formula can indicate are as follows:Correspondingly, D point voltage UDWith B point voltage UBBetween change type can be with table
It is shown as:The current value of calculated transforming circuit output end output is IAPDIt can indicate are as follows:And it should be noted that due to using AD conversion unit 11 to carry out voltage in this kind of embodiment
Acquisition, it is therefore desirable to the ADC value that will acquireAndActual voltage value is converted to, can specifically be indicated are as follows: And it is pointed out that analog-to-digital conversion list in concrete application
The difference of member 11, the parameter in the formula are just corresponding different.For example, in a kind of specific embodiment, using 12, bilateral
Road, low-power consumption, successive approximation AD conversion unit 11, conversion time is fast, is conducive to timely and accurately determine current value.
12 exportable greatest measures of AD conversion unit 11 are that 4095,3.3V is reference voltage corresponding to the greatest measure
Value.
In this kind of embodiment, the resistance value of each resistance can be set and be adjusted according to actual needs, such as be tied
The design parameter of conjunction APD tube core and AD conversion unit 11 carries out the adjustment of each resistance value.Such as it needs to meet:It is thereinAPD is flowed into for setting
The maximum current value of tube core, UmaxThe maximum voltage value that can be inputted for AD conversion unit 11.The resistance value of current-limiting resistance R usually may be used
Think k Ω rank, for example, 1k Ω.The resistance value of first resistor R1 is usually significantly larger than the resistance value of second resistance R2,3rd resistor
The resistance value of R3 is usually significantly larger than the resistance value of the 4th resistance R4.
In addition, in this embodiment, determining corresponding ADC value by AD conversion unit 11, and be also by mould
Computing the resistor value of the number converting unit 11 again based on each resistance goes out to flow through the current value of current-limiting resistance R, and in other embodiments,
AD conversion unit 11 can also be only used for determining corresponding ADC value, the associated components of the subsequent calculating for carrying out current value
Can be integrated with control unit 20, or the calculating of current value is directly carried out by control unit 20, have no effect on reality of the invention
It applies.Such as in a kind of specific embodiment, analog converter exports correlation ADC value by spi bus, by collecting with control unit 20
At current calculator part receive after, carry out the calculating of current value.
The control unit 20 being connect with current sampling circuit 10, for judging that currently received current value is more than or equal to
When preset first current threshold, output control signal.
The setting that can carry out the specific value of the first current threshold according to the actual situation, for example, the first current threshold can
To be equal to the specific permitted maximum current value of APD tube core, or it is set as being slightly less than the maximum current value.Work as control unit
When the 20 current current values got are more than or equal to preset first current threshold, just illustrate that APD tube core exists at this time and damaged
Bad risk, control unit 20 then export control signal.
And it should be noted that in view of the received current value of control unit 20 be more than or equal to the first current threshold when,
May be the case where artificial incorrect operation has occurred or extreme test case, and these extreme cases may not necessarily be eliminated in time, because
This, in a kind of specific embodiment, control unit 20 can be more than or equal to preset the judging currently received current value
When one current threshold, just lasting output controls signal, i.e., no matter whether subsequently received current value is reduced to the first current threshold
Value is hereinafter, will not stop controlling the output of signal, and only when receiving the halt instruction manually sent, disconnection controls the defeated of signal
Out.It is of course also possible to be and to judge the current value weight received after persistently outputing the control signal of certain time length
The first current threshold is returned hereinafter, just no longer carrying out the output of control signal.In addition, considering APD abnormal conditions in the occasion of part
Duration may not be too long, therefore be also possible to only judge current value be more than or equal to the first current threshold when output
Control signal, as long as and the current value that receives is reduced to the first current threshold hereinafter, and other control signals triggering item
Part is also unsatisfactory for, and can no longer export control signal, and above scheme is chosen according to the actual situation, does not influence this
The implementation of invention.
First end is connect with the input terminal of avalanche photodide APD tube core, second end ground connection, control terminal and control unit
The shunt circuit 30 of 20 connections reduces transformation for itself first end to be connected with second end after receiving control signal
Circuit function is in the voltage of APD tube core, to reduce the electric current of APD tube core.
When shunt circuit 30 does not receive control signal, open a way between itself first end and second end.And works as and receive
After controlling signal, itself first end is just connected with second end.Due to the first end of shunt circuit 30 and the input terminal of APD tube core
Connection, second end ground connection, i.e., shunt circuit 30 is in parallel with APD tube core, after conducting, can so that APD tube core bias
It reduces, that is, reduces the voltage that transforming circuit acts on APD tube core.Since bias reduces, the gain of APD tube core is just reduced.Together
When, since shunt circuit 30 is in parallel with APD tube core, also it is achieved that the shunting to APD tube core, the impedance of shunt circuit 30 are got over
Low, shunting effect is more obvious.Therefore, after the shunt circuit 30 of the application setting is connected, the electricity of APD tube core can be effectively reduced
Stream.
In a kind of specific embodiment of the invention, shunt circuit 30 can be specifically included:
First end is connect with the input terminal of APD tube core, as the first end of shunt circuit 30, second end and switching device Q1
First end connection shunt resistance RH；
Control terminal is connect with control unit 20, as the control terminal of shunt circuit 30, second end ground connection, as shunt circuit
The switching device Q1 of 30 second end is reduced for itself first end to be connected with second end after receiving control signal
Transforming circuit acts on the voltage of APD tube core, to reduce the electric current of APD tube core.
In view of the equivalent resistance of APD tube core is usually several kilohms or more of rank, therefore the resistance value of shunt resistance RH
Typically tens ohm to ohms up to a hundred, effectively the bias being applied on APD tube core to be reduced rapidly near 0,
And it can be excessive to avoid the electric current of shunt circuit 30 itself.Since the bias of APD tube core reduces, while transforming circuit output
Electric current substantially passes through shunt circuit 30 and flows into ground, is conducive to quickly reduce the electric current in APD tube core.
Switching device Q1 can be according to whether receiving control signal determines the first end of itself and the on-off of second end
Situation.In view of the extensive use of metal-oxide-semiconductor, cost is relatively low, and switching device Q1 can be chosen for metal-oxide-semiconductor, the embodiment of Fig. 2
In, it is using the source level of metal-oxide-semiconductor as the second end of switching device Q1, the first end to drain as switching device Q1, grid is made
For the control terminal of switching device Q1.Certainly, in other embodiments, other kinds of switch can be chosen according to actual needs
Device Q1 has no effect on implementation of the invention.
Using the protection circuit of APD optical module provided by the embodiment of the present invention, comprising: current sampling circuit, for obtaining
The current value exported by transforming circuit output end is taken, and current value is sent to control unit；It is connect with current sampling circuit
Control unit, for when judging that currently received current value is more than or equal to preset first current threshold, output control to be believed
Number；First end is connect with the input terminal of avalanche photodide APD tube core, and second end ground connection, control terminal is connect with control unit
Shunt circuit, for itself first end be connected with second end after receiving control signal, reduction transforming circuit is acted on
In the voltage of APD tube core, to reduce the electric current of APD tube core.
In the scheme of the application, when control unit judges that currently received current value is more than or equal to preset first electric current
When threshold value, illustrates that the electric current in APD tube core at this time is excessively high, APD tube core may be damaged, therefore, control unit output
Control signal.After shunt circuit receives control signal, the first end of itself can be connected with second end, after conducting
The voltage that transforming circuit acts on APD tube core is reduced, so that the gain reduction of APD tube core, and at the same time convertor circuit can
Play the role of shunting.Since the scheme of the application and the size of incident light are unrelated, as long as detecting that current value is excessive, will pass through
Shunt circuit limits the electric current of APD tube core, and the scheme of the application is allowed to be effectively protected APD tube core since overcurrent causes
Damage.
In a kind of specific embodiment of the invention, current sampling circuit 10 is specifically used for: according to the default sampling period
The current value exported by transforming circuit output end is obtained, and current value is sent to control unit 20；
Control unit 20 is also used to: by the sampling period, the current value and the preceding current value once obtained currently obtained,
Calculate current changing rate；When judging that current changing rate is more than or equal to preset change rate threshold value, output control signal.
In this embodiment, it is contemplated that if only when determining that current value is excessive, then control shunt circuit 30 and lead
It is logical, it can not still may avoid the destruction of APD tube core in time in the occasion of part.Therefore, in this kind of embodiment, become from electric current
Rate is set out, to play the role of prevention.Specifically, current sampling circuit 10 obtains electric current according to the preset sampling period
Value, the sampling period usually can be set it is shorter, in order to acquisition current value close to instantaneous value, while can to calculate
Current changing rate it is more accurate, such as the sampling period be set as 1 microsecond.
The current value currently got can be subtracted the current value got in a upper sampling period by control unit 20, divided by
Using the period to obtain current changing rate.When judging that current changing rate is more than or equal to preset change rate threshold value, APD pipe
Core is likely to abnormal conditions occurred, and control unit 20 exports control signal then to be prevented in advance, avoids APD electric current excessive
The generation of caused damage.It should be noted that control unit 20 is carrying out current changing rate in this kind of embodiment
The sampling period is used when calculating, i.e., it is identical as the progress sampling period of current value of current sampling circuit 10, in other implementations
In mode, the calculating that other times interval carries out current changing rate is also can be used in control unit 20, is had no effect on of the invention
Implement.
In a kind of specific embodiment of the invention, control unit 20 is also used to: according to the current value currently obtained with
And calculated current changing rate, the target current value after the first duration is calculated, is preset when target current value is more than or equal to
The second current threshold when, output control signal.
In view of in practical applications, depositing in some circumstances, the current value of transforming circuit output end output is closer to
First current threshold, but electric current is only relatively slowly to rise, i.e., and current changing rate is lower than change rate threshold value, at this time control unit
20 may also there is one there is still a need for the output for carrying out control signal again after detecting that current value is more than the first current threshold
The impaired risk of fixed APD tube core.In this kind of embodiment, according to the current value and calculated curent change currently obtained
Rate calculates the target current value after the first duration, that is, realizes estimating to the electric current of future time instance, work as target current value
When more than or equal to preset second current threshold, control unit 20 can export control signal, and such scheme is further
Avoid the damage of APD tube core.
First duration usually can be set shorter, such as in a kind of specific embodiment, the size of the first duration can be with
Equal to the size in the sampling period that current sampling circuit 10 uses.The size of second current threshold may be set to be equal to first
The size of current threshold, in order to design and calculate.
Table 1 is seen, table 1 is under 25 DEG C of test environment, using the survey of multiple APD optical modules of this kind of embodiment
Test result:
Table 1:
Even if received incident light has reached 3dbm it can be seen from test result, the APD of the scheme of the application is applied
Optical module can still work normally, not damaged.
In a kind of specific embodiment of the invention, further includes:
The display device being connect with control unit 20, the current value being currently received for real-time display control unit 20.
In this kind of embodiment, the current value being currently received using display device real-time display control unit 20, favorably
The curent change situation in APD tube core is known in staff, especially in test, carries out subsequent place convenient for staff
Reason.
Corresponding to above embodiment, the embodiment of the invention also provides a kind of guard methods of APD optical module, hereafter retouch
The guard method for the APD optical module stated can correspond to each other reference with the protection circuit of above-described APD optical module.
See Fig. 3, for the present invention in a kind of implementation flow chart of the guard method of APD optical module, this method include with
Lower step:
Step S301: current sampling circuit obtains the current value exported by transforming circuit output end, and current value is sent
To control unit；
Step S302: control unit is judging currently received current value more than or equal to preset first current threshold
When, output control signal；
Step S303: itself first end is connected with second end after receiving control signal for shunt circuit, reduces and becomes
Volt circuit acts on the voltage of APD tube core, to reduce the electric current of APD tube core.
In a kind of specific embodiment of the invention, step S301 specifically: current sampling circuit is according to default sampling
Period obtains the current value exported by transforming circuit output end, and current value is sent to control unit；
Further comprising the steps of: control unit the current value currently obtained and preceding was once obtained by the sampling period
Current value calculates current changing rate；When judging that current changing rate is more than or equal to preset change rate threshold value, output control
Signal.
In a kind of specific embodiment of the invention, further includes: control unit according to the current value currently obtained and
Calculated current changing rate calculates the target current value after the first duration, when target current value is more than or equal to preset
When the second current threshold, output control signal.
In a kind of specific embodiment of the invention, the size of the second current threshold is equal to the big of the first current threshold
Small, the size of the first duration is equal to the size in sampling period.
In a kind of specific embodiment of the invention, further includes:
The current value that display device real-time display control unit is currently received.
The invention also discloses a kind of APD optical module, which may include the APD in any of the above-described embodiment
The protection circuit of optical module, herein not repeated explanation.
It should also be noted that, herein, relational terms such as first and second and the like are used merely to one
Entity or operation are distinguished with another entity or operation, without necessarily requiring or implying between these entities or operation
There are any actual relationship or orders.Moreover, the terms "include", "comprise" or its any other variant are intended to contain
Lid non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those
Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or equipment
Intrinsic element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that
There is also other identical elements in process, method, article or equipment including the element.
Professional further appreciates that, unit described in conjunction with the examples disclosed in the embodiments of the present disclosure
And algorithm steps, can be realized with electronic hardware, computer software, or a combination of the two, in order to clearly demonstrate hardware and
The interchangeability of software generally describes each exemplary composition and step according to function in the above description.These
Function is implemented in hardware or software actually, the specific application and design constraint depending on technical solution.Profession
Technical staff can use different methods to achieve the described function each specific application, but this realization is not answered
Think beyond the scope of this invention.
Used herein a specific example illustrates the principle and implementation of the invention, and above embodiments are said
It is bright to be merely used to help understand technical solution of the present invention and its core concept.It should be pointed out that for the common of the art
, without departing from the principle of the present invention, can be with several improvements and modifications are made to the present invention for technical staff, these
Improvement and modification are also fallen within the protection scope of the claims of the present invention.
Claims (10)
1. a kind of protection circuit of APD optical module characterized by comprising
Current sampling circuit is sent to control for obtaining the current value exported by transforming circuit output end, and by the current value
Unit processed；
The described control unit being connect with the current sampling circuit, for judging that the currently received current value is greater than
When equal to preset first current threshold, output control signal；
First end is connect with the input terminal of avalanche photodide APD tube core, second end ground connection, control terminal and described control unit
The shunt circuit of connection, for itself first end to be connected with second end after receiving the control signal, described in reduction
Transforming circuit acts on the voltage of the APD tube core, to reduce the electric current of the APD tube core.
2. the protection circuit of APD optical module according to claim 1, which is characterized in that the current sampling circuit is specific
For: the current value exported by transforming circuit output end is obtained according to the default sampling period, and the current value is sent to control
Unit processed；
Described control unit is also used to: by the sampling period, the current value that currently obtains and preceding once being obtained
The current value, calculates current changing rate；When judging that the current changing rate is more than or equal to preset change rate threshold value,
Export the control signal.
3. the protection circuit of APD optical module according to claim 2, which is characterized in that described control unit is also used to: being pressed
According to the current value and the calculated current changing rate currently obtained, the target current after the first duration is calculated
Value exports the control signal when the target current value is more than or equal to preset second current threshold.
4. the protection circuit of APD optical module according to claim 3, which is characterized in that second current threshold it is big
The small size equal to first current threshold, the size of first duration are equal to the size in the sampling period.
5. the protection circuit of APD optical module according to claim 1, which is characterized in that the current sampling circuit is specific
Include:
First end and the first end of current-limiting resistance connect, and common end is connect with the output end of the transforming circuit, second end and
The first resistor of the first end connection of second resistance；
The second resistance of second end ground connection；
First end is connect with the second end of the current-limiting resistance, the 3rd resistor that second end is connect with the first end of the 4th resistance；
The 4th resistance of second end ground connection；
First input end is connect with the second end of the first resistor, and the second end of the second input terminal and the 3rd resistor connects
It connects, the AD conversion unit that output end is connect with described control unit, the first end and second end for obtaining itself sample
The voltage value arrived, and pass through the resistance value of the first resistor, the resistance value of the second resistance, the resistance value of the 3rd resistor, institute
The resistance value of the 4th resistance and the resistance value of the current-limiting resistance are stated, the current value for flowing through the current-limiting resistance is calculated, as obtaining
The current value exported by the transforming circuit output end got, and the current value is sent to described control unit.
6. the protection circuit of APD optical module according to claim 5, which is characterized in that the shunt circuit specifically includes:
First end is connect with the input terminal of the APD tube core, as the first end of the shunt circuit, second end and switching device
First end connection shunt resistance；
Control terminal is connect with described control unit, as the control terminal of the shunt circuit, second end ground connection, as the shunting
The switching device of the second end of circuit, for leading itself first end with second end after receiving the control signal
It is logical, the voltage that the transforming circuit acts on the APD tube core is reduced, to reduce the electric current of the APD tube core.
7. the protection circuit of APD optical module according to claim 6, which is characterized in that the switching device is metal-oxide-semiconductor.
8. the protection circuit of APD optical module according to any one of claims 1 to 7, which is characterized in that further include:
The display device being connect with described control unit, the electric current being currently received for real-time display described control unit
Value.
9. a kind of guard method of APD optical module characterized by comprising
Current sampling circuit obtains the current value exported by transforming circuit output end, and the current value is sent to control list
Member；
Described control unit is when judging that the currently received current value is more than or equal to preset first current threshold, output
Control signal；
Itself first end is connected with second end after receiving the control signal for shunt circuit, reduces the transforming circuit
The voltage of APD tube core is acted on, to reduce the electric current of the APD tube core.
10. a kind of APD optical module, which is characterized in that the protection including APD optical module as claimed in any one of claims 1 to 8
Circuit.
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| CN201811320162.8A CN109217272B (en) | 2018-11-07 | 2018-11-07 | APD optical module and protection circuit and protection method thereof |
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| CN112260247A (en) * | 2020-12-23 | 2021-01-22 | 深圳市迅特通信技术有限公司 | APD protection circuit and device |
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