CN205911597U - Er -doped fiber laser's drive circuit - Google Patents
Er -doped fiber laser's drive circuit Download PDFInfo
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- CN205911597U CN205911597U CN201620864745.7U CN201620864745U CN205911597U CN 205911597 U CN205911597 U CN 205911597U CN 201620864745 U CN201620864745 U CN 201620864745U CN 205911597 U CN205911597 U CN 205911597U
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- electric contact
- doped fiber
- fiber laser
- current
- electric
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Abstract
The utility model discloses an er -doped fiber laser's drive circuit, include: PWM circuit, control switch and LC filter circuit, LC filter circuit includes inductance L1 and electric capacity C1, control switch includes control end, first electric contact and second electric contact, the control end electricity is connected the PWM signal output part of PWM circuit, L1's first end is connected to first electric contact electricity, second electric contact ground connection, the anodal of electric capacity C1 and er -doped fiber laser's negative pole, electric capacity C1's minus earth is connected to inductance L1's second end difference electricity. Rectangular pulse's duty cycle can be changed through the PWM circuit to change control switch's switching time, and control switch's switching time can change the time constant of LC filter circuit charge -discharge, reaches the big or small purpose of control current, through the level and smooth current -voltage effect that LC strained the circuit, makes the er -doped fiber laser's that flows through electric current smoothness be stable direct current.
Description
Technical field
The utility model is related to erbium doped fiber laser technical field, more particularly, to a kind of driving of erbium doped fiber laser
Circuit.
Background technology
Erbium doped fiber laser is the core devices of erbium-doped fiber amplifier, and existing erbium doped fiber laser is because of its work
Electric current is big, generally higher than 500ma, and the current regulating circuit adopting in the market is usually to adopt the drive circuit shown in Fig. 1.
Existing drive circuit is to be operated in, using FET, the electric current that variable resistor area controls erbium doped fiber laser, and electric current
Size determine the power output of laser instrument.
Refer to Fig. 2, Fig. 2 is the output characteristic curve figure of FET.Have one on the output characteristic curve of FET
Individual region is variable resistor area, when field-effect pipe works in this region, is equivalent to a resistance between its drain electrode and source electrode,
And the resistance of this resistance can be changed by changing the voltage ugs between grid and source electrode.In this region, drain electrode and source electrode
Between voltage uds very little, the corresponding slope of curve of different ugs is different, and ugs is bigger, and slope is bigger, and resistance is less.So
FET is worked as variable resistor use, one is to control its uds little, two is to change its ugs to obtain different equivalent resistances.
But it is operated in the FET in variable resistor area because of dissipated power greatly, if working long hours, can produce is a large amount of
Heat, may result in transistor overheated and puncture, device fails.
Utility model content
The utility model embodiment provides a kind of drive circuit of erbium doped fiber laser, to solve above technology and to ask
Topic.
For reaching this purpose, the utility model employs the following technical solutions:
The utility model embodiment provides a kind of drive circuit of erbium doped fiber laser, comprising: pwm circuit, control
Switch and lc filter circuit；Described lc filter circuit includes inductance l1 and electric capacity c1；
Described controlling switch includes control end, the first electric contact and the second electric contact；Described control end electrically connects described pwm
The pwm signal output part of circuit, described first electric contact electrically connects the first end of l1, described second electric contact ground connection；Inductance l1
The second end be electrically connected the positive pole of electric capacity c1 and the negative pole of erbium doped fiber laser, the minus earth of electric capacity c1；Er-doped light
Positive pole electrical connection+vcc the power supply of fibre laser；
During work, described pwm circuit produces the adjustable rectangular pulse of pulse width, is accounted for according to the pulse of described rectangular pulse
The empty switch time than the described controlling switch of control；Lc filter circuit is used for smoothing the work electricity of described erbium doped fiber laser
Stream, the operating current making described erbium doped fiber laser is direct current；
Wherein, described switch time includes the time that the first electric contact is connected with described second electric contact, and described
One electric contact and the time of described second electric contact disconnection.
The dutycycle of rectangular pulse in the utility model embodiment, can be changed by pwm circuit, thus changing controlling switch
Switch time, filter the smooth Current Voltage effect of circuit through lc, the electric current flowing through erbium doped fiber laser smooths as steady
Fixed direct current；And the switch time of controlling switch can change the time constant of lc filter circuit discharge and recharge, er-doped light can be flowed through
The electric current of fibre laser changes, and reaches the purpose of control electric current size.
Preferably, described controlling switch is n-channel enhancement mode FET；Described control end is that n-channel enhancement mode field is imitated
Should pipe grid, described first electric contact be n-channel enhancement mode FET drain electrode, described second electric contact be n-channel increasing
The source electrode of strong type FET.
In the present embodiment, as one kind preferably embodiment, described controlling switch is n-channel enhancement mode FET,
And the FET in the present embodiment is operated on off state, reduce the dissipated power of FET, reduce device heating amount,
Increased the stability of equipment work.
Preferably, described controlling switch is Npn triode；Described control end is the base stage of Npn triode, described first electricity
Contact is the colelctor electrode of Npn triode, and described second electric contact is the emitter stage of Npn triode.
In the present embodiment, controlling switch can also adopt Npn triode, likewise, Npn triode is operated in switch shape
State.
Preferably, described drive circuit also includes current-limiting resistance；
The first end of described current-limiting resistance electrically connects the positive pole of erbium doped fiber laser, the second end electricity of described current-limiting resistance
Connect+vcc power supply.
Preferably, the two ends of described current-limiting resistance are also associated with the voltage for testing described current-limiting resistance both end voltage
Table.
Described current-limiting resistance plays metering function in circuit it can also be used to the current detecting of erbium doped fiber laser, passes through
The voltage difference at resistance r1 two ends can learn the size of current of erbium doped fiber laser.
As can be seen from the above technical solutions, the utility model embodiment has the advantage that the utility model embodiment
In, the dutycycle of rectangular pulse being changed by pwm circuit, thus changing the switch time of controlling switch, filtering circuit through lc
The effect of smooth Current Voltage, the electric current flowing through erbium doped fiber laser smooths as stable direct current；And the opening of controlling switch
The pass time can change the time constant of lc filter circuit discharge and recharge, and the electric current that can flow through erbium doped fiber laser changes,
Reach the purpose of control electric current size.
Brief description
In order to be illustrated more clearly that the utility model embodiment or technical scheme of the prior art, below will be to embodiment
Or in description of the prior art the accompanying drawing of required use be briefly described it should be apparent that, drawings in the following description are only
It is some embodiments of the present utility model, for those of ordinary skill in the art, before not paying creative labor
Put, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is the circuit structure diagram of the drive circuit of existing erbium doped fiber laser.
Fig. 2 is the output characteristic curve figure of FET.
Fig. 3 is a kind of drive circuit of erbium doped fiber laser that the utility model embodiment provides.
Fig. 4 is the drive circuit of another kind of erbium doped fiber laser that the utility model embodiment provides.
In figure:
10th, erbium doped fiber laser；20th, pwm circuit；30th, controlling switch；40th, lc filter circuit.
Specific embodiment
For enabling utility model purpose of the present utility model, feature, advantage more obvious and understandable, will tie below
Close the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment be clearly and completely described,
Obviously, the embodiments described below are only a part of embodiment of the utility model, and not all embodiment.Based on this reality
With the embodiment in new, it is all other that those of ordinary skill in the art are obtained under the premise of not making creative work
Embodiment, broadly falls into the scope of the utility model protection.
Further illustrate the technical solution of the utility model below in conjunction with the accompanying drawings and by specific embodiment.
Refer to Fig. 3, Fig. 3 is a kind of drive circuit of erbium doped fiber laser 10 that the utility model embodiment provides.
This drive circuit includes pwm circuit 20, controlling switch 30 and lc filter circuit 40.
Specifically, lc filter circuit 40 includes inductance l1 and electric capacity c1.Controlling switch 30 includes control end, the first electric contact
With the second electric contact.
Described control end electrically connects the pwm signal output part of pwm circuit 20, and described first electric contact electrically connects the first of l1
End, described second electric contact ground connection；Second end of inductance l1 is electrically connected positive pole and the erbium doped fiber laser 10 of electric capacity c1
Negative pole, the minus earth of electric capacity c1；Positive pole electrical connection+vcc the power supply of erbium doped fiber laser 10.
During work, pwm circuit 20 produces the adjustable rectangular pulse of pulse width, according to the pulse duration of described rectangular pulse
Than the switch time controlling controlling switch 30；Lc filter circuit 40 is used for smoothing the operating current of erbium doped fiber laser 10, makes
The operating current of erbium doped fiber laser 10 stabilizes to direct current；Wherein, described switch time includes the first electric contact and described
The time that two electric contacts are connected, and the time that described first electric contact and described second electric contact disconnect.
As one kind preferred embodiment, controlling switch 30 adopts n-channel enhancement mode FET；Described control end is
The grid of n-channel enhancement mode FET, described first electric contact is the drain electrode of n-channel enhancement mode FET, described second
Electric contact is the source electrode of n-channel enhancement mode FET.
The rectangle of the control end sending to controlling switch 30 in the utility model embodiment, can be changed by pwm circuit 20
The dutycycle of pulse；The dutycycle of rectangular pulse directly affects the switch time of controlling switch 30；And 40, lc filter circuit smooths
The effect of Current Voltage, it can flow through the electric current of erbium doped fiber laser 10 and smooth as stable direct current；And controlling switch 30
Switch time can change the time constant of lc filter circuit 40 discharge and recharge, the electric current that can flow through erbium doped fiber laser 10 is sent out
Changing, reaches the purpose of control electric current size.Additionally, n-channel enhancement mode FET is operated on off state, reduce field
The dissipated power of effect pipe, reduces device heating amount, increased the stability of equipment work.
Wherein, lc filters the effect that circuit 40 plays smooth Current Voltage, particularly as follows: electric capacity c1 is when its cathode voltage raises,
It is in charging working condition, portion of energy is stored in electric capacity c1, when its cathode voltage reduces, start to put with exponential form
Electricity, discharges the electricity being stored in electric capacity c1, because the electric current of inductance l1 can not be mutated, therefore inductance l1 can smooth work electricity
The waveform of stream, the electric current flowing through laser instrument smooths as fixing direct current.
Please continue to refer to Fig. 4, Fig. 4 is the driving of another kind of erbium doped fiber laser 10 that the utility model embodiment provides
Circuit.
As a kind of embodiment of suboptimum, controlling switch 30 also can adopt Npn triode.
Specifically, described control end is the base stage of Npn triode, and described first electric contact is the colelctor electrode of Npn triode,
Described second electric contact is the emitter stage of Npn triode.
In the present embodiment, controlling switch 30 can also adopt Npn triode, likewise, Npn triode is operated in switch shape
State.By the duty cycle adjustment of the rectangular pulse of pwm circuit 20 output, the electric current that also can flow through erbium doped fiber laser 10 is sent out
Changing, reaches the purpose of control electric current size.
Additionally, described drive circuit also includes current-limiting resistance, i.e. resistance r1.The first end electrical connection of described current-limiting resistance is mixed
The positive pole of erbium optical fiber laser, the second end electrical connection+vcc power supply of described current-limiting resistance.
In the present embodiment, electric current r1 plays metering function it can also be used to the operating current detection of erbium doped fiber laser, passes through
The voltage difference at resistance r1 two ends can calculate the size of this operating current.Preferably, the two ends of described current-limiting resistance also can connect
Connect the voltmeter for testing described current-limiting resistance both end voltage.
It is understood that controlling switch 30 can also be replaced with other switch elements, as relay, pnp triode,
P-channel enhancement mode mosfet pipe etc., simply slightly adjusting in circuit result, it is identical with the utility model embodiment to can achieve
Or close technique effect, it is without departing from thought of the present utility model, and needs not move through performing creative labour and can draw, therefore
All should be within protection domain of the present utility model.
In description of the present utility model, it should be noted that " first end " is upper end or left end, " second end " are lower end
Or right-hand member, it is for only for ease of and describe the utility model and simplify description, rather than instruction or the device or the element that imply indication
Must have specific orientation, with specific azimuth configuration and operation, therefore it is not intended that to restriction of the present utility model.
The above, above example only in order to the technical solution of the utility model to be described, is not intended to limit；Although ginseng
According to previous embodiment, the utility model is described in detail, it will be understood by those within the art that: it is still
Technical scheme described in foregoing embodiments can be modified, or wherein some technical characteristics are carried out with equivalent replacing
Change；And these modifications or replacement, do not make the essence of appropriate technical solution depart from the utility model each embodiment technical scheme
Spirit and scope.
Claims (5)
1. a kind of drive circuit of erbium doped fiber laser is it is characterised in that include: pwm circuit, controlling switch and lc filtered electrical
Road；Described lc filter circuit includes inductance l1 and electric capacity c1；
Described controlling switch includes control end, the first electric contact and the second electric contact；Described control end electrically connects described pwm circuit
Pwm signal output part, described first electric contact electrically connect l1 first end, described second electric contact ground connection；The of inductance l1
Two ends are electrically connected the positive pole of electric capacity c1 and the negative pole of erbium doped fiber laser, the minus earth of electric capacity c1；Er-doped fiber swashs
Positive pole electrical connection+vcc the power supply of light device；
During work, described pwm circuit produces the adjustable rectangular pulse of pulse width, according to the pulse duty factor of described rectangular pulse
Control the switch time of described controlling switch；Lc filter circuit is used for smoothing the operating current of described erbium doped fiber laser, makes
The operating current of described erbium doped fiber laser is direct current；
Wherein, described switch time includes the time that the first electric contact is connected with described second electric contact, and described first electricity
Contact and the time of described second electric contact disconnection.
2. drive circuit according to claim 1 is it is characterised in that described controlling switch is n-channel enhancement mode field-effect
Pipe；Described control end is the grid of n-channel enhancement mode FET, and described first electric contact is n-channel enhancement mode FET
Drain electrode, described second electric contact be n-channel enhancement mode FET source electrode.
3. drive circuit according to claim 1 is it is characterised in that described controlling switch is Npn triode；Described control
Hold the base stage for Npn triode, described first electric contact is the colelctor electrode of Npn triode, described second electric contact is npn tri- pole
The emitter stage of pipe.
4. the drive circuit according to Claims 2 or 3 is it is characterised in that also include current-limiting resistance；
The first end of described current-limiting resistance electrically connects the positive pole of erbium doped fiber laser, the second end electrical connection of described current-limiting resistance
+ vcc power supply.
5. drive circuit according to claim 4 is it is characterised in that the two ends of described current-limiting resistance are also associated with for surveying
Try the voltmeter of described current-limiting resistance both end voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620864745.7U CN205911597U (en) | 2016-08-10 | 2016-08-10 | Er -doped fiber laser's drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620864745.7U CN205911597U (en) | 2016-08-10 | 2016-08-10 | Er -doped fiber laser's drive circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205911597U true CN205911597U (en) | 2017-01-25 |
Family
ID=57801925
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620864745.7U Expired - Fee Related CN205911597U (en) | 2016-08-10 | 2016-08-10 | Er -doped fiber laser's drive circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205911597U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106058627A (en) * | 2016-08-10 | 2016-10-26 | 东莞市金厚田光电有限公司 | Driving circuit of erbium-doped fiber laser |
-
2016
- 2016-08-10 CN CN201620864745.7U patent/CN205911597U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106058627A (en) * | 2016-08-10 | 2016-10-26 | 东莞市金厚田光电有限公司 | Driving circuit of erbium-doped fiber laser |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170125 Termination date: 20200810 |