CN104638884B - A kind of self-locking type PWM wave generation circuits for measuring remote verification device - Google Patents
A kind of self-locking type PWM wave generation circuits for measuring remote verification device Download PDFInfo
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- CN104638884B CN104638884B CN201410716705.3A CN201410716705A CN104638884B CN 104638884 B CN104638884 B CN 104638884B CN 201410716705 A CN201410716705 A CN 201410716705A CN 104638884 B CN104638884 B CN 104638884B
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- 238000003079 width control Methods 0.000 claims abstract description 18
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- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims 1
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- 238000005516 engineering process Methods 0.000 description 5
- 210000001367 artery Anatomy 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K7/00—Modulating pulses with a continuously-variable modulating signal
- H03K7/08—Duration or width modulation ; Duty cycle modulation
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/01—Arrangements for reducing harmonics or ripples
Abstract
The present invention is disclosed and there is provided a kind of self-locking type PWM wave generation circuits for measuring remote verification device，It includes that control signal produces circuit、Pulse width control circuit、Self-locking type PWM wave generation circuits，Control signal produces circuit to be included by ZD1、The amplitude limiter circuit of ZD2 compositions、By R1、R2、R3、R4、C1、The anti-phase subtractor circuit of U1 compositions，Its effect is by input signal VI、VF is processed into the certain inversion signal VO1 of amplitude，Pulse width control circuit is by R5、R6、R7、U2 is constituted，Its effect is that VO1 and VR1 is coordinated the pwm control signal VO2 for producing adjustable pulse width section，Self-locking type PWM wave generation circuits are by upper bridge arm control circuit、Lower bridge arm control circuit composition，Input signal handled by upper and lower bridge arm control circuit is identical，Output signal is contrary，And can not be height simultaneously，VO5 is exported、VO6 is used to control IGBT work.
Description
Technical field
The present invention relates to a kind of PWM wave generation circuits, more particularly to a kind of self-locking type for measuring remote verification device
PWM wave generation circuits.
Background technology
With scientific and technological development, the progress of society, electric energy is used as a kind of cleaning, quick, the convenient controllable type energy of conveying
All trades and professions are had been widely used for, due to rectification and the input of frequency conversion equipment, is being brought great convenience to user, together
When, pollution is also caused to electrical network, for this purpose, Active Power Filter-APF（APF）Arise at the historic moment as modern harmonic decrease devices, with
The characteristics of by means of its small volume, capacity continuously adjustabe, fast compensation harmonic tracking velocity, the main flow for becoming harmonic wave control industry is set
It is standby, wherein, Active Power Filter-APF（APF）IGBT control modes become its development key technology, and active electric power filter
The stable foundation stone of ripple device equipment safety, control IGBT switches it is disconnected just can absorb well or compensation network on harmonic wave, make
The various working conditions of Active Power Filter-APF be in steady statue, PWM wave technologies control IGBT cut-off have become one it is popular
Technology, wherein, the dead zone function of IGBT is also a difficult problem of PWM ripple applications.
For this purpose, lot of domestic and international scholar proposes the mode that different PWM ripples control IGBT, for example, changed using high accuracy
Chip, or DSP processing methods etc., but, the difficulty and cost of PWM ripple control technologies are so considerably increased, based on this, I
Propose a kind of self-locking type PWM wave generation circuits for Active Power Filter-APF, the circuit has simple and stable, cost
It is low, it is easy to accomplish the advantages of.
The content of the invention
The technical problem to be solved is to overcome the deficiencies in the prior art, provides a kind of for measuring remote verification
The self-locking type PWM wave generation circuits of device, for controlling the IGBT working methods of Active Power Filter-APF, the circuit simply may be used
By, low cost, be conducive to marketing.
The technical solution adopted in the present invention is：The present invention includes that control signal produces circuit, pulse width control circuit, self-locking
Type PWM wave generation circuit, the control signal produce circuit, pulse width control circuit, self-locking type PWM wave generation circuits and are electrically connected successively
Connect, the control signal produces input connection output signal of processor VI and power network current feedback signal VF of circuit, described
After signal VI and VF are processed into certain control signal VO1 of amplitude, pulse width control circuit described in Jing produces required PWM ripple pulsewidths
Signal VO2, signal VO2 are treated as driving bridge arm and lower bridge arm on IGBT respectively via the self-locking type PWM wave generation circuits
Signal VO5 and VO6, finally by the self-locking type PWM wave generation circuits export.
The control signal produce circuit include the first integrated circuit, the first stabilivolt, the second stabilivolt, the first electric capacity,
First resistor, second resistance, 3rd resistor, the 4th resistance, one end connection output signal of processor VI of the first resistor, institute
State the first resistor other end connect the positive pole of first stabilivolt, one end of the second resistance, the one of first electric capacity
End, the crus secunda of first integrated circuit, the negative pole of first stabilivolt connect the negative pole of second stabilivolt, described
The other end of the positive pole connection second resistance of the second stabilivolt, the other end of first electric capacity, the first integrated electricity
First foot on road, one end connection power network current feedback signal VF of the 3rd resistor, the other end connection of the 3rd resistor
One end of 3rd foot and the 4th resistance of first integrated circuit, the other end connection circuit of the 4th resistance is altogether
Ground, the first foot of first integrated circuit is VO1 signal contacts.
The pulse width control circuit includes the second integrated circuit, the 5th resistance, the 6th resistance, the 7th resistance, the described 5th
One end connection VO1 signal contacts of resistance, the other end of the 5th resistance connect the 3rd foot of second integrated circuit, institute
Crus secunda connection signal VR1 and one end of the 6th resistance of the second integrated circuit are stated, the other end of the 6th resistance connects
Connect circuit altogether, the first foot of second integrated circuit connects one end of the 7th resistance, the 7th resistance it is another
End connection power supply VCC, the first foot of second integrated circuit is VO2 signal contacts.
The self-locking type PWM wave generation circuits include the 3rd integrated circuit, the 4th integrated circuit, the 5th integrated circuit,
It is six integrated circuits, the first diode, the second diode, the second electric capacity, the 3rd electric capacity, the 8th resistance, the 9th resistance, the tenth electric
It is resistance, the 11st resistance, the 12nd resistance, the 13rd resistance, the 14th resistance, the 15th resistance, the 16th resistance, the 17th electric
Resistance, one end of the 8th resistance, one end of the 13rd resistance are connected and connect VO2 signal contacts, the 8th resistance
The other end connects the 3rd foot of the 3rd integrated circuit, and the other end of the 13rd resistance connects the 5th integrated circuit
Crus secunda, the 3rd integrated circuit crus secunda connect one end of the 9th resistance, the other end connection of the 9th resistance
Altogether, the other end of the 14th resistance connects the of the 5th integrated circuit for one end of 14th resistance and circuit
Three feet, one end of the first foot of the 3rd integrated circuit connection the tenth resistance, one end of the 11st resistance, the first diode
Negative pole, the tenth resistance the other end connection circuit power VCC, the 11st resistance the other end connection described first
The positive pole of diode, one end of second electric capacity, the crus secunda of the 4th integrated circuit, the other end of second electric capacity
Altogether, the 3rd foot connection signal VR2 of the 4th integrated circuit, the first foot of the 4th integrated circuit connect connection circuit
One end of 12nd resistance, one end connection circuit power VCC of the 12nd resistance, the of the 4th integrated circuit
One foot exports IGBT control signals VO5, the first foot of the 5th integrated circuit connect one end of the 15th resistance, the 16th
One end of resistance, the negative pole of the second diode, the other end connection circuit power VCC of the 15th resistance, the described 16th
The other end of resistance connect the positive pole of second diode, one end of the 3rd electric capacity, the of the 6th integrated circuit
Two feet, altogether, the 3rd foot of the 6th integrated circuit connects signal VR2, institute to the other end connection circuit of the 3rd electric capacity
The first foot for stating the 6th integrated circuit connects one end of the 17th resistance, the other end connection circuit of the 17th resistance
Power supply VCC, the first foot output IGBT control signals VO6 of the 6th integrated circuit.
The invention has the beneficial effects as follows：As the present invention includes that control signal produces circuit, pulse width control circuit, self-locking type
PWM wave generation circuits, the control signal produce circuit, pulse width control circuit, self-locking type PWM wave generation circuits and are electrically connected successively
Connect, the control signal produces input connection output signal of processor VI and power network current feedback signal VF of circuit, described
After signal VI and VF are processed into certain control signal VO1 of amplitude, pulse width control circuit described in Jing produces required PWM ripple pulsewidths
Signal VO2, signal VO2 are treated as driving bridge arm and lower bridge arm on IGBT respectively via the self-locking type PWM wave generation circuits
Signal VO5 and VO6, finally by self-locking type PWM wave generation circuit output controls IGBT.Each several part circuit function of the present invention
Clearly and be easily achieved, the electricity such as circuit, pulse width control circuit, self-locking type PWM wave generation circuits are produced with simple control signal
Road part, realizes the function such as the control of the IGBT upper and lower bridge arms to Active Power Filter-APF and the control of Dead Time, so
Have the advantages that components and parts are few, circuit simple, it is good stability, safe so that it is easy to spread, it is easy to the marketization, and the electricity
Road is simple and reliable, reduces the cost of control difficulty and equipment.
Description of the drawings
Fig. 1 is that control signal of the present invention produces circuit theory schematic diagram；
Fig. 2 is present invention control pulse width control circuit principle schematic；
Fig. 3 is self-locking type PWM wave generation circuit principle schematics of the present invention；
Fig. 4 is implementing circuit principle schematic of the present invention.
Specific embodiment
As shown in Figures 1 to 4, the present invention includes that control signal produces circuit, pulse width control circuit, self-locking type PWM ripples and produces
Raw circuit, the control signal produce circuit, pulse width control circuit, self-locking type PWM wave generation circuits and are sequentially connected electrically, the control
Input connection output signal of processor VI of signal generating circuit processed and power network current feedback signal VF, the signal VI and VF
PWM ripple pulse width signal VO2 needed for pulse width control circuit described in Jing is produced after being processed into certain control signal VO1 of amplitude, letter
Number VO2 via the self-locking type PWM wave generation circuits be treated as driving respectively on IGBT the signal VO5 of bridge arm and lower bridge arm and
VO6, finally by self-locking type PWM wave generation circuit output controls IGBT.
The control signal produce circuit include the first integrated circuit U1, the first stabilivolt ZD1, the second stabilivolt ZD2, the
One electric capacity C1, first resistor R1, second resistance R2,3rd resistor R3, the 4th resistance R4, one end connection of first resistor R1
Output signal of processor VI, the other end of first resistor R1 connect the positive pole of the first stabilivolt ZD1, described second electric
One end of resistance R2, one end of the first electric capacity C1, the crus secunda of the first integrated circuit U1, the first stabilivolt ZD1
Negative pole connect the negative pole of the second stabilivolt ZD2, the positive pole of the second stabilivolt ZD2 connects second resistance R2
The other end, the other end of the first electric capacity C1, first foot of the first integrated circuit U1, one end of 3rd resistor R3
Connection power network current feedback signal VF, the other end of 3rd resistor R3 connect the 3rd foot of the first integrated circuit U1 and
One end of the 4th resistance R4, the other end of the 4th resistance R4 connect circuit altogether, the first integrated circuit U1's
First foot is VO1 signal contacts.In the present embodiment, the effect of the circuit is to feed back output signal of processor VI and power network current
Signal VF is processed into certain control signal VO1 of amplitude.
The pulse width control circuit includes the second integrated circuit U2, the 5th resistance R5, the 6th resistance R6, the 7th resistance R7,
One end connection VO1 signal contacts of the 5th resistance R5, the other end of the 5th resistance R5 connect the second integrated electricity
3rd foot of road U2, the crus secunda of the second integrated circuit U2 connect one end of signal VR1 and the 6th resistance R6, described
Altogether, first foot of the second integrated circuit U2 connects the 7th resistance R7's to the other end connection circuit of the 6th resistance R6
One end, the other end connection power supply VCC of the 7th resistance R7, first foot of the second integrated circuit U2 are connect for VO2 signals
Point.In the present embodiment, the effect of the circuit is to coordinate signal VO1 signals with VR1 signals, produces the PWM ripple arteries and veins of our needs
Bandwidth signals VO2, opens the turn-off time so as to control IGBT.
The self-locking type PWM wave generation circuits include the 3rd integrated circuit U3, the 4th integrated circuit U4, the 5th integrated circuit
U5, the 6th integrated circuit U6, the first diode D1, the second diode D2, the second electric capacity C2, the 3rd electric capacity C3, the 8th resistance R8,
9th resistance R9, the tenth resistance R10, the 11st resistance R11, the 12nd resistance R12, the 13rd resistance R13, the 14th resistance
R14, the 15th resistance R15, the 16th resistance R16, the 17th resistance R17, one end of the 8th resistance R8, the 13rd resistance
One end of R13 is connected and connects VO2 signal contacts, and the other end of the 8th resistance R8 connects the 3rd integrated circuit U3
The 3rd foot, the other end of the 13rd resistance R13 connects the 5th integrated circuit U5 crus secundas, the 3rd integrated electricity
Road U3 crus secundas connect one end of the 9th resistance R9, and the other end of the 9th resistance R9 connects the 14th resistance
Altogether, the other end of the 14th resistance R14 connects the 3rd foot of the 5th integrated circuit U5 for one end of R14 and circuit,
The first feet of the 3rd integrated circuit U3 connect one end of the tenth resistance R10, one end of the 11st resistance R11, the one or two
The negative pole of pole pipe D1, the other end connection circuit power VCC of the tenth resistance R10, the other end of the 11st resistance R11
Connect the positive pole of the first diode D1, one end of the second electric capacity C2, the crus secunda of the 4th integrated circuit U4, institute
State the other end connection circuit of the second electric capacity C2 altogether, the 3rd foot of the 4th integrated circuit U4 connection signal VR2, described the
First foot of four integrated circuit U4 connects one end of the 12nd resistance R12, one end connection electricity of the 12nd resistance R12
First foot output IGBT control signals VO5 of road power supply VCC, the 4th integrated circuit U4, the 5th integrated circuit U5 the
One foot connects one end of the 15th resistance R15, one end of the 16th resistance R16, the negative pole of the second diode D2, and described the
The other end connection circuit power VCC of 15 resistance R15, the other end of the 16th resistance R16 connect the two or two pole
The positive pole of pipe D2, one end of the 3rd electric capacity C3, the crus secunda of the 6th integrated circuit U6, the 3rd electric capacity C3's is another
One end connection circuit altogether, the of the 3rd foot of the 6th integrated circuit U6 connection signal VR2, the 6th integrated circuit U6
One foot connects one end of the 17th resistance R17, and the other end connection circuit power VCC of the 17th resistance R17 is described
First foot output IGBT control signals VO6 of the 6th integrated circuit U6.In the present embodiment, the circuit by upper bridge arm control circuit,
Lower bridge arm control circuit two parts composition, the input signal handled by upper and lower bridge arm control circuit are identical, middle and output signal
Conversely, VO2 is processed into into VO5, VO6, and VO5, VO6 can not be height simultaneously；It is specific as follows：
Upper bridge arm control circuit is made up of R8, R9, R10, R11, R12, D1, C2, U3, U4, and U3 is same by input signal VO2
Its driving force is mutually exported and increases, R11, C2, D1 coordinate VR2 adjust the Dead Time of bridge arm on IGBT, that is,
The open and close of the upper bridge arms of IGBT disconnected time, R10, R12 are used to increase driving force, and most VO2 is processed into and can drive on IGBT at last
The signal VO5 of bridge arm.
Lower bridge arm control circuit is made up of R13, R14, R15, R16, R17, D2, C3, U5, U6, and U5 is by input signal VO2
Anti-phase output simultaneously increases its driving force, and R16, C3, D2 coordinate VR2 adjust the Dead Time of bridge arm under IGBT, that is,
The open and close of bridge arm disconnected time under IGBT, R15, R17 are used to increase driving force, and most VO2 is processed into and can drive under IGBT at last
The signal VO6 of bridge arm.
Claims (3)
1. a kind of self-locking type PWM wave generation circuits for measuring remote verification device, it is characterised in that：It includes control signal
Produce circuit, pulse width control circuit, self-locking type PWM wave generation circuits, the control signal produce circuit, pulse width control circuit,
Self-locking type PWM wave generation circuits are sequentially connected electrically, and the control signal produces the input connection output signal of processor of circuit
VI and power network current feedback signal VF, the signal VI and VF are processed into pulsewidth described in Jing after certain control signal VO1 of amplitude
Control circuit produces required PWM ripple pulse width signal VO2, and signal VO2 is treated as via the self-locking type PWM wave generation circuits
The signal VO5 and VO6 of bridge arm and lower bridge arm on IGBT are driven respectively, are finally exported by the self-locking type PWM wave generation circuits, institute
Stating control signal generation circuit includes the first integrated circuit（U1）, the first stabilivolt（ZD1）, the second stabilivolt（ZD2）, it is first electric
Hold（C1）, first resistor（R1）, second resistance（R2）, 3rd resistor（R3）, the 4th resistance（R4）, the first resistor（R1）'s
One end connects output signal of processor VI, the first resistor（R1）The other end connect first stabilivolt（ZD1）Just
Pole, the second resistance（R2）One end, first electric capacity（C1）One end, first integrated circuit（U1）Second
Foot, first stabilivolt（ZD1）Negative pole connect second stabilivolt（ZD2）Negative pole, second stabilivolt（ZD2）
Positive pole connect the second resistance（R2）The other end, first electric capacity（C1）The other end, first integrated circuit
（U1）The first foot, the 3rd resistor（R3）One end connection power network current feedback signal VF, the 3rd resistor（R3）'s
The other end connects first integrated circuit（U1）The 3rd foot and the 4th resistance（R4）One end, the 4th resistance
（R4）The other end connection circuit altogether, first integrated circuit（U1）The first foot be VO1 signal contacts.
2. a kind of self-locking type PWM wave generation circuits for measuring remote verification device according to claim 1, its feature
It is：The pulse width control circuit includes the second integrated circuit（U2）, the 5th resistance（R5）, the 6th resistance（R6）, the 7th resistance
（R7）, the 5th resistance（R5）One end connection VO1 signal contacts, the 5th resistance（R5）Other end connection described the
Two integrated circuits（U2）The 3rd foot, second integrated circuit（U2）Crus secunda connection signal VR1 and the 6th resistance
（R6）One end, the 6th resistance（R6）The other end connection circuit altogether, second integrated circuit（U2）The first foot
Connect the 7th resistance（R7）One end, the 7th resistance（R7）The other end connection power supply VCC, the second integrated electricity
Road（U2）The first foot be VO2 signal contacts.
3. a kind of self-locking type PWM wave generation circuits for measuring remote verification device according to claim 1, its feature
It is：The self-locking type PWM wave generation circuits include the 3rd integrated circuit（U3）, the 4th integrated circuit（U4）, the 5th integrated electricity
Road（U5）, the 6th integrated circuit（U6）, the first diode（D1）, the second diode（D2）, the second electric capacity（C2）, the 3rd electric capacity
（C3）, the 8th resistance（R8）, the 9th resistance（R9）, the tenth resistance（R10）, the 11st resistance（R11）, the 12nd resistance（R12）、
13rd resistance（R13）, the 14th resistance（R14）, the 15th resistance（R15）, the 16th resistance（R16）, the 17th resistance
（R17）, the 8th resistance（R8）One end, the 13rd resistance（R13）One end be connected and connect VO2 signal contacts, institute
State the 8th resistance（R8）The other end connect the 3rd integrated circuit（U3）The 3rd foot, the 13rd resistance（R13）'s
The other end connects the 5th integrated circuit（U5）Crus secunda, the 3rd integrated circuit（U3）It is electric that crus secunda connects the described 9th
Resistance（R9）One end, the 9th resistance（R9）The other end connect the 14th resistance（R14）One end and circuit altogether,
14th resistance（R14）The other end connect the 5th integrated circuit（U5）The 3rd foot, the 3rd integrated circuit
（U3）First foot connects the tenth resistance（R10）One end, the 11st resistance（R11）One end, the first diode（D1）'s
Negative pole, the tenth resistance（R10）The other end connection circuit power VCC, the 11st resistance（R11）The other end connection
First diode（D1）Positive pole, second electric capacity（C2）One end, the 4th integrated circuit（U4）Crus secunda,
Second electric capacity（C2）The other end connection circuit altogether, the 4th integrated circuit（U4）The 3rd foot connection signal VR2,
4th integrated circuit（U4）The first foot connect the 12nd resistance（R12）One end, the 12nd resistance（R12）
One end connection circuit power VCC, the 4th integrated circuit（U4）The first foot output IGBT control signals VO5, described the
Five integrated circuits（U5）First foot connects the 15th resistance（R15）One end, the 16th resistance（R16）One end, second
Diode（D2）Negative pole, the 15th resistance（R15）The other end connection circuit power VCC, the 16th resistance
（R16）The other end connect second diode（D2）Positive pole, the 3rd electric capacity（C3）One end, the described 6th integrated
Circuit（U6）Crus secunda, the 3rd electric capacity（C3）The other end connection circuit altogether, the 6th integrated circuit（U6）'s
3rd foot connects signal VR2, the 6th integrated circuit（U6）The first foot connect the 17th resistance（R17）One end,
17th resistance（R17）The other end connection circuit power VCC, the 6th integrated circuit（U6）The first foot output
IGBT control signals VO6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410716705.3A CN104638884B (en) | 2014-12-02 | 2014-12-02 | A kind of self-locking type PWM wave generation circuits for measuring remote verification device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410716705.3A CN104638884B (en) | 2014-12-02 | 2014-12-02 | A kind of self-locking type PWM wave generation circuits for measuring remote verification device |
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| CN104638884A CN104638884A (en) | 2015-05-20 |
| CN104638884B true CN104638884B (en) | 2017-03-29 |
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|---|---|---|---|---|
| CN101388595A (en) * | 2008-01-08 | 2009-03-18 | 上海大学 | PWM pulse controller |
| CN102098030A (en) * | 2009-12-09 | 2011-06-15 | 罗姆股份有限公司 | Semiconductor device and switching regulator using the device |
| CN102224663A (en) * | 2008-11-24 | 2011-10-19 | Itt制造企业公司 | Low voltage power supply |
| CN103208909A (en) * | 2013-04-25 | 2013-07-17 | 国家电网公司 | Pulse-width modulation (PWM) wave generation circuit for controlling on-off of insulated gate bipolar transistor (IGBT) |
| CN104158387A (en) * | 2013-05-13 | 2014-11-19 | 力智电子股份有限公司 | DC-DC controller and operation method of multi-ramp signal thereof |
| CN204538948U (en) * | 2014-12-02 | 2015-08-05 | 国网内蒙古东部电力有限公司电力科学研究院 | A kind of self-locking type PWM wave generation circuit for measuring long-range calibration equipment |
-
2014
- 2014-12-02 CN CN201410716705.3A patent/CN104638884B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101388595A (en) * | 2008-01-08 | 2009-03-18 | 上海大学 | PWM pulse controller |
| CN102224663A (en) * | 2008-11-24 | 2011-10-19 | Itt制造企业公司 | Low voltage power supply |
| CN102098030A (en) * | 2009-12-09 | 2011-06-15 | 罗姆股份有限公司 | Semiconductor device and switching regulator using the device |
| CN103208909A (en) * | 2013-04-25 | 2013-07-17 | 国家电网公司 | Pulse-width modulation (PWM) wave generation circuit for controlling on-off of insulated gate bipolar transistor (IGBT) |
| CN104158387A (en) * | 2013-05-13 | 2014-11-19 | 力智电子股份有限公司 | DC-DC controller and operation method of multi-ramp signal thereof |
| CN204538948U (en) * | 2014-12-02 | 2015-08-05 | 国网内蒙古东部电力有限公司电力科学研究院 | A kind of self-locking type PWM wave generation circuit for measuring long-range calibration equipment |
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| CN104638884A (en) | 2015-05-20 |
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