CN102545620B - Power supply device used for arc machining - Google Patents
Power supply device used for arc machining Download PDFInfo
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- CN102545620B CN102545620B CN201110363285.1A CN201110363285A CN102545620B CN 102545620 B CN102545620 B CN 102545620B CN 201110363285 A CN201110363285 A CN 201110363285A CN 102545620 B CN102545620 B CN 102545620B
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Abstract
The present invention provides a power supply device used for arc machining, and is characterized by comprising: a DC converting circuit; a full-bridge inverter circuit used for converting a DC voltage into a high-frequency AC voltage; an output control circuit used for controlling the inverter circuit, wherein when an input current is high than a reference current, the inverter circuit is stopped for a set time; a switch element drive circuit used for driving a switch element in response to an output control signal and providing current for an inverse bias capacitor; and a switch control circuit used for making a first switch element and a fourth switch element conduct uncoincidently during a period from 0 to 1/2 period and making a second switch element and a third switch element conduct uncoincidently during a period from 1/2 to 1 period when the inverter circuit is stopped. Therefore, the power supply device of the utility model can solve the problem as follows: when an inverse bias voltage of the switch element driving circuit used for driving the inverter circuit of the power supply device drops, turn-off loss may increase, so that the switch element is degraded.
Description
Technical field
The present invention relates to the control of the switch element driver circuit driving the inverter circuit be built in supply unit.
Background technology
If the switch element reverse blas being built in the inverter circuit in arc component processing power source reduces, then can be delayed when turning off, thus increase shutoff loss.
Fig. 4 is the electrical connection diagram of the arc component processing power source of prior art.In the diagram, the smmothing capacitor C1 that DC transfer circuit is located at the outlet side of No. 1 rectification circuit DR1 by No. 1 rectification circuit DR1 and parallel connection is formed.
Inverter circuit INV forms full-bridge by the 1st opposite switch element TR1 to the 4th switch element TR4, exports after DC voltage conversion is high-frequency ac voltage.
The high-frequency ac voltage converted by inverter circuit INV is transformed to the high-frequency ac voltage being suitable for electric arc processes by transformer INT, No. 2 times rectification circuit DR2 carries out rectification to the output of main transformer INT, there is provided electric power via direct current reactor DCL between sacrificial electrode 1 and machined object M, produce electric arc.
1 primary current testing circuit ID shown in Fig. 4 detects the input current of 1 side of transformer INT and exports as 1 primary current detection signal ID.Output current detection circuit OD detects the output current of 2 sides of main transformer INT and exports as output electric current measure signal Od.1 time the value of the value of 1 primary current detection signal Id and the illustrated predetermined reference current signal If of omission compares by overcurrent sensing circuit OCP, if 1 primary current detected value becomes more than reference current value, then exports 1 over-current detection signal Ocp.
Output control circuit SC shown in Fig. 4 carry out making pulse frequency constant come the PWM of modulating pulse width control, export according to output electric current measure signal Od the 1st of half period that controls to offset one from another the pulse duration that control signal Sc1 and the 2nd exports control signal Sc2.Then, if input 1 over-current detection signal Ocp, then during stipulated time T1, forbid that the described 1st exports the output that control signal Sc1 and the 2nd exports control signal Sc2.
Fig. 2 is the use of pulse transformer, the details drawing of the 1st switch element driver circuit DK1 such as shown in Fig. 1, 1st switch element driver circuit DK1 is by 1 driving switch element TR5, pulse transformer PT, 2 driving switch element TR6, resistor R6 and capacitor C2 in reverse bias is formed, 1 driving switch element TR5 responds the 1st and exports control signal Sc1 and conducting, in response to the conducting of this 1 driving switch element TR5, the voltage of regulation is applied on 1 secondary coil of pulse transformer PT, induced voltage is produced according to this applying voltage, and outputted to 2 secondary coils of pulse transformer PT.Next, 2 driving switch element TR6 are cut off in response to induced voltage, apply positive bias via the grid of resistor R6 to the 1st switch element TR1 forming inverter circuit, and provide electric current via resistor R5 and resistor R6 to capacitor C2 in reverse bias, generate reverse blas.
Fig. 5 is the waveform timing diagram of the action that prior art is described.In Figure 5, the waveform of Fig. 5 (A) represents 1 over-current detection signal Pcp, the waveform of Fig. 5 (B) represents that the 1st exports control signal Sc1, the waveform of Fig. 5 (C) represents that the 2nd exports control signal Sc2, the waveform of Fig. 5 (D) represents the 1st switching drive signal Dk1, and the waveform of Fig. 5 (E) represents the 2nd switching drive signal Dk2.
Moment t=t1 shown in Fig. 5, after the 1st output control signal Sc1 shown in Fig. 5 (B) becomes high level, 1 driving switch element TR5 conducting of the 1st switch element driver circuit Dk1 shown in Fig. 2, is applied to the 1 secondary coil N1 of pulse transformer PT by 1 voltage of regulation.Further, if pulse transformer PT is applied in 1 voltage at 1 secondary coil, then induced voltage is produced at 2 secondary coil N2.
At moment t=t1, cut off 2 driving switch element TR6 in response to induced voltage, apply positive bias via resistor R6 to the 1st switch element TR1 forming inverter circuit, make its conducting.And then, via resistor R6, electric current is supplied to capacitor C2 in reverse bias, and via resistor R5, electric current is supplied to capacitor C2 in reverse bias, generate reverse blas (such as-8V).
After the 1st output control signal Sc1 shown in moment t=t2, Fig. 5 (B) becomes low level, cut off 1 driving switch element TR5, stop the 1 secondary coil N1 of pulse transformer T1 to apply 1 voltage.
At moment t=t2, after stopping that 1 voltage is applied to the 1 secondary coil N1 of the pulse transformer T1 shown in Fig. 2, stop the induced voltage of generation 2 secondary coil N2.Now, if 2 driving switch element T6 conducting, be then changed to reverse blas (such as from+16V to-8V) from positive bias, cut off the 1st switch element TR1 shown in Fig. 4.
Now, at moment t=t2, if electric arc, in producing, long-time short circuit occurs, then 1 overcurrent sensing circuit OCP shown in Fig. 4 detects 1 overcurrent formed by long-time short circuit, and exports 1 over-current detection signal Ocp.Then, output control circuit SC is after input 1 over-current detection signal Ocp, during predetermined time T1 (2 cycles in such as inverter cycle), forbid that the 1st exports the output that control signal Sc1 and the 2nd exports control signal Sc2, the action of inverter circuit is stopped, avoiding the damage of the switch element caused due to the increase of the power consumption of long-time short circuit thus.
But as shown in Fig. 5 (C), if the output disabled time of the 2nd output control signal Sc2 is elongated, then the electric charge of capacitor C2 in reverse bias is discharged, thus causes reverse blas to reduce.
At moment t=t4, the 1st output disabled time T1 exporting control signal Sc1 and the 2nd output control signal Sc2 terminates, shown in moment t=t5, Fig. 5 (B) the 1st exports control signal Sc1 becomes high level, and the 1st switch element TR1 is applied in positive bias and conducting.
After the 1st output control signal Sc1 shown in moment t6, Fig. 5 (B) becomes low level, cut off the 1st switch element TR1.Now, because reverse blas (such as from-8V to-2V) reduces, be therefore delayed in the shutoff of the 1st switch element TR1, thus the collector current of turn-off power loss and switch element when turning off increases.Now, if exceed the permissible range of the switch element forming inverter circuit, switch element deterioration (such as, patent documentation 1) will be caused.
Patent documentation 1:JP JP 59-104830 publication
In the arc component processing power source of the prior art shown in Fig. 4, if there is long-time short circuit in electric arc produces, then in each switch element forming inverter circuit, flow through big current, power consumption increases, and causes the damage of switch element.Therefore, in order to avoid the damage of switch element, in prior art, when flowing through big current in the switch element at inverter circuit, during the stipulated time (1 cycle in such as inverter cycle is to 3 cycles), stop the action of inverter circuit, make the inverter cycle elongated, thus reduce the power consumption of switch element and flow through the generation number of times of big current at switch element, avoid damaging.
But if the action dwell time of inverter circuit is elongated, then the charging forming the capacitor in reverse bias of switch element driver circuit will become insufficient, and reverse blas will reduce.And, if reverse blas reduces, then the turn-off speed of switch element will be slack-off, if remove long-time short circuit in this condition and inverter circuit starts action, the collector current of then first shutoff loss and switch element when turning off can significantly increase, and produces the problem causing the deterioration of switch element.
Summary of the invention
Therefore, in the present invention, even if object is to provide in electric arc produces, long-time short circuit occurs, overcurrent protection also can give full play to the arc component processing power source of function.
In order to solve above-mentioned problem, the 1st invention is a kind of arc component processing power source, is characterised in that to possess: DC transfer circuit, and it carries out rectification, level and smooth to commercial ac power source, thus output dc voltage; The inverter circuit of full-bridge, described DC voltage conversion is high-frequency ac voltage by it, and is made up of to the 4th switch element the 1st switch element; Transformer, described high-frequency ac voltage is transformed to the voltage being suitable for load by it; Output control circuit, it exports the output control signal controlling described inverter circuit, and stops the described inverter circuit predetermined time after the input current of described transformer becomes more than predetermined reference current; And switch element driver circuit, 1 side of its pulse transformer in response to described output control signal applies assigned voltage, induced voltage is exported 2 sides, and drive described switch element via resistance and to capacitor providing current in reverse bias, also possess: ON-OFF control circuit, it is when described inverter circuit stops, make described 1st switch element and the 4th switch element do not overlap during 0 to 1/2 cycle ground conducting, make described 2nd switch element and the 3rd switch element do not overlap during 1/2 to 1 cycle ground conducting.
2nd invention is the arc component processing power source on the basis of the 1st invention, be characterised in that, described ON-OFF control circuit makes the ON time of described 1st switch element be 0 to 1/4 cycle, the ON time making described 2nd switch element was 1/4 to 2/4 cycle, the ON time making described 3rd switch element was 2/4 to 3/4 cycle, and the ON time making described 4th switch element was 3/4 to 4/4 cycle.
3rd invention is the arc component processing power source on the basis of the 1st invention, is characterised in that, when described inverter circuit stops, the minimum ON time of described switch element is 5% of 1 cycle.
(effect of invention)
In order to solve above-mentioned problem, when there is long-time short circuit and flow through big current in switch element at inverter circuit in the 1st invention in electric arc produces, stop the inverter circuit stipulated time, and provide electric charge to reduce to prevent reverse blas to the capacitor in reverse bias forming switch element driver circuit in stopping, therefore removing long-time short circuit and can not be delayed in turn-off speed when starting inverter circuit action, the increase of first shutoff loss and collector current can be suppressed, deterioration or the damage of switch element can be avoided.
2nd invention and the 3rd invention, by the duty ratio of inverter is set as suitable value, can provide electric charge to capacitor in reverse bias fully, reverse blas can be maintained suitable value.
Accompanying drawing explanation
Fig. 1 is the electrical connection diagram of the arc component processing power source of embodiments of the present invention 1.
Fig. 2 is the details drawing of the 1st switch element driver circuit shown in Fig. 1.
Fig. 3 is the waveform timing diagram of the action that execution mode 1 is described.
Fig. 4 is the electrical connection diagram of the arc component processing power source of prior art.
Fig. 5 is the waveform timing diagram of the action that prior art is described.
The explanation of symbol
1 sacrificial electrode
AC commercial ac power source
C1 smmothing capacitor
DS ON-OFF control circuit
Ds1 the 1st switch controlling signal
Ds2 the 2nd switch controlling signal
Ds3 the 3rd switch controlling signal
Ds4 the 4th switch controlling signal
DCL direct current reactor
DR1 No. 1 rectification circuit
DR2 No. 2 rectification circuits
DK1 the 1st switch element driver circuit
DK2 the 2nd switch element driver circuit
DK3 the 3rd switch element driver circuit
DK4 the 4th switch element driver circuit
Dk1 the 1st switch element drive singal
Dk2 the 2nd switch element drive singal
Dk3 the 3rd switch element drive singal
Dk4 the 4th switch element drive singal
ID 1 primary current testing circuit
Id 1 primary current detection signal
IR output current initialization circuit
Ir output current setting signal
INT transformer
OD output current detection circuit
Od output electric current measure signal
OCP 1 overcurrent sensing circuit
Ocp 1 over-current detection signal
M machined object
SC main control circuit
Sc1 the 1st exports control signal
Sc2 the 2nd exports control signal
TH welding torch
TS starting switch
Ts enabling signal
TR1 the 1st switch element
TR2 the 2nd switch element
TR3 the 3rd switch element
TR4 the 4th switch element
Embodiment
Fig. 1 is the electrical connection diagram of the arc component processing power source of embodiments of the present invention 1.In FIG, represent with the construct of the electrical connection diagram same-sign of the prior art shown in Fig. 4 and carry out same action, therefore omit the description, the construct that symbol is different is only described.
Output control circuit SC shown in Fig. 1 carry out making pulse frequency constant come the PWM of modulating pulse width control, export according to output electric current measure signal Od the 1st of half period that controls to offset one from another the pulse duration that control signal Sc1 and the 2nd exports control signal Sc2.And, if input 1 over-current detection signal Ocp, then export the phase control signal Sct in predetermined time T1 (1 cycle in such as inverter cycle is to 3 cycles), and during output phase control signal Sct, the duty ratio exporting control signal Sc1 and the 2nd output control signal Sc2 by the 1st is fixed as predetermined value (such as, 5% to 25%) and exports.
ON-OFF control circuit DS shown in Fig. 1 exports control signal Sc1 in response to the 1st and exports the 1st switch controlling signal Ds1 and the 4th switch controlling signal Ds4, drive the 1st switch element driver circuit DK1 and the 4th switch element driver circuit DK4, export control signal Sc2 in response to the 2nd and export the 2nd switch controlling signal Ds2 and the 3rd switch controlling signal Ds3, drive the 2nd switch element driver circuit DK2 and the 3rd switch element driver circuit DK3, and when input phase control signal Sct, the 4th switch controlling signal Ds4 is such as made to be shifted 1/4 periodic phase relative to the 1st switch controlling signal Ds1, 3rd switch controlling signal Ds3 to be shifted 1/4 periodic phase relative to the 2nd switch controlling signal Ds2, export afterwards.
Fig. 3 is the waveform timing diagram of the action that embodiments of the present invention 1 are described.
In figure 3, the waveform of Fig. 3 (A) represents 1 over-current detection signal Ocp, the waveform of Fig. 3 (B) represents phase control signal Sct, the waveform of Fig. 3 (C) represents that the 1st exports control signal Sc1, the waveform of Fig. 3 (D) represents that the 2nd exports control signal Sc2, the waveform of Fig. 3 (E) represents the 1st switch controlling signal Ds1, the waveform of Fig. 3 (F) represents the 2nd switch controlling signal Ds2, the waveform of Fig. 3 (G) represents the 3rd switch controlling signal Ds3, the waveform of Fig. 3 (H) represents the 4th switch controlling signal Ds4, the waveform of Fig. 3 (I) represents the 1st switching drive signal Dk1, the waveform of Fig. 3 (J) represents the 2nd switching drive signal Dk2.
Next, action of the present invention is described.
Moment t=t1 shown in Fig. 3, after the 1st output control signal Sc1 shown in Fig. 3 (C) becomes high level, the high level that ON-OFF control circuit DS response the 1st exports control signal Sc1 exports the 1st switch controlling signal Ds1 and the 4th switch controlling signal Ds4.
Inputting the 1st switch controlling signal Ds1 to the 1st switch element driver circuit DK1 shown in Fig. 2 after 1 driving switch element TR5 conducting, the 1 secondary coil N1 of 1 driving switch element TR5 pulse transformer PT applies 1 voltage of regulation, pulse transformer PT, after 1 secondary coil N1 is applied in 1 voltage, produces induced voltage at 2 secondary coil N2.Then, 2 driving switch element TR6 are cut off in response to induced voltage, via the grid applying positive bias of resistor R6 to the 1st switch element TR1 of formation inverter circuit, and provide electric current via resistor R5 and resistor R6 to capacitor C2 in reverse bias, generate reverse blas (such as-8V).Further, the 4th switch element driver circuit DK4 also carries out and above-mentioned identical action, therefore omits the description.
At moment t=t2, after the 1st switch controlling signal Ds1 shown in Fig. 3 (C) becomes low level, stop applying 1 voltage at the 1 secondary coil N1 of the pulse transformer PT of the 1st switch element driver circuit DK1, the generation of the induced voltage of 2 secondary coil N2 also stops.Now, 2 driving switch element TR6 conducting, as shown in Fig. 3 (I), is changed to reverse blas (such as from+16V to-8V) from positive bias, cuts off the 1st switch element TR1.
At moment t=t2, if there is long-time short circuit in electric arc produces, then 1 overcurrent sensing circuit OCP detects 1 overcurrent that long-time short circuit causes, and exports as 1 over-current detection signal Ocp.Then, output control circuit SC is in response to 1 over-current detection signal, export the phase control signal Sct of predetermined time T1, and during output phase control signal Sct, the duty ratio exporting control signal Sc1 and the 2nd output control signal Sc2 by the 1st is set in predetermined value (such as 10%).
ON-OFF control circuit DS shown in Fig. 1 is after moment t=t3 phase control signal Sct becomes high level, at moment t=t4, the 3rd switch controlling signal Ds3 shown in Fig. 3 (G) to be shifted 1/4 periodic phase relative to the 2nd switch controlling signal Ds2 shown in Fig. 3 (F), at moment t=t6, the 4th switch controlling signal Ds4 shown in 3 (H) to be shifted 1/4 periodic phase relative to the 1st switch controlling signal Ds1 shown in Fig. 3 (E), to export afterwards.
If make the 3rd switch controlling signal Ds3 be shifted 1/4 periodic phase relative to the 2nd switch controlling signal Ds2 shown in Fig. 3, then the 2nd switch element TR2 and the 3rd switch element TR3 becomes dissengaged positions, and inverter circuit stops action.Now, the 2nd switch element driver circuit DK2, in response to the voltage of the 1 secondary coil applying regulation of the 2nd switch controlling signal Ds2 pulse transformer PT, produces induced voltage in response to this applying voltage, and exports to 2 secondary coils of pulse transformer PT.Then, 2 driving switch element TR6 are cut off in response to induced voltage, positive bias is applied via the grid of resistor R6 to the 1st switch element TR1 forming inverter circuit, and provide electric current via resistor R5 and resistor R6 to capacitor C2 in reverse bias, maintain reverse blas (such as-8V).
Maintain in the output time of phase control signal Sct, the 1st switch element driver circuit DK1, the 3rd switch element driver circuit DK3 and the 4th switch element driver circuit DK4 also carry out the reverse blas (such as-8V) of above-mentioned shown same action.
At moment t=t11, after phase control signal Sct becomes low level, ON-OFF control circuit DS is passed to PWM from phase control and controls, at moment t=t12, after 1st switch controlling signal Ds1 and the 4th switch controlling signal Ds4 becomes high level, the 1st switch element TR1 and the 4th switch element TR4 conducting.
Next, at moment t=t13, after the 1st switch controlling signal Ds1 and the 4th switch controlling signal Ds4 becomes low level, cut off the 1st switch element TR1 and the 4th switch element TR4.Now, owing to maintaining reverse blas (such as-8V), therefore, can not be delayed in the turn-off speed of the 1st switch element TR1 and the 4th switch element TR4.
As mentioned above; when producing 1 overcurrent due to long-time short circuit in electric arc produces; inverter circuit is controlled to be passed to phase control from PWM; by the reverse blas being applied to switch element being maintained assigned voltage under phase control; the increase of collector current when phase control can be suppressed to terminate and be passed to the first shutoff loss of PWM control and turn off, improves the protection of switch element.
In above-mentioned, if the duty ratio exporting control signal Sc1 and the 2nd output control signal Sc2 by the 1st is set to 5%, then roughly can maintains reverse blas, can not be delayed in the turn-off speed of switch element.
Claims (2)
1. an arc component processing power source, possesses:
DC transfer circuit, it carries out rectification, level and smooth to commercial ac power source, thus output dc voltage;
The inverter circuit of full-bridge, described DC voltage conversion is high-frequency ac voltage by it, and is made up of to the 4th switch element the 1st switch element, and the 1st switch element and the 2nd switch element are positioned at the 1st half-bridge, and the 3rd switch element and the 4th switch element are positioned at the 2nd half-bridge;
Transformer, described high-frequency ac voltage is transformed to the voltage being suitable for load by it;
Output control circuit, it exports the output control signal controlling described inverter circuit, and stops the described inverter circuit predetermined time after the input current of described transformer becomes more than predetermined reference current; With
Switch element driver circuit, 1 side of its pulse transformer in response to described output control signal applies assigned voltage, exports induced voltages 2 sides, and drives described switch element via resistance and to capacitor providing current in reverse bias,
Described arc component processing power source also possesses:
ON-OFF control circuit, it is when described inverter circuit stops, make described 1st switch element and the 4th switch element do not overlap during 0 to 1/2 cycle ground conducting, make described 2nd switch element and the 3rd switch element do not overlap during 1/2 to 1 cycle ground conducting
When described inverter circuit stops, the minimum ON time of described switch element is 5% of 1 cycle.
2. arc component processing power source according to claim 1, is characterized in that,
Described ON-OFF control circuit makes the ON time of described 1st switch element be 0 to 1/4 cycle, the ON time making described 4th switch element was 1/4 to 2/4 cycle, the ON time making described 2nd switch element was 2/4 to 3/4 cycle, and the ON time making described 3rd switch element was 3/4 to 4/4 cycle.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2010260905A JP5584101B2 (en) | 2010-11-24 | 2010-11-24 | Arc machining power supply |
| JP2010-260905 | 2010-11-24 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102545620A CN102545620A (en) | 2012-07-04 |
| CN102545620B true CN102545620B (en) | 2015-07-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110363285.1A Active CN102545620B (en) | 2010-11-24 | 2011-11-16 | Power supply device used for arc machining |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP5584101B2 (en) |
| CN (1) | CN102545620B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110679076B (en) * | 2017-05-29 | 2021-03-26 | 松下知识产权经营株式会社 | Power supply device for arc machining and method for controlling power supply device for arc machining |
| JP7087471B2 (en) | 2018-03-08 | 2022-06-21 | オムロン株式会社 | Power converter and inverter control method |
| CN112867581A (en) * | 2018-08-24 | 2021-05-28 | 罗伯特·博世有限公司 | Laser cutting machine and safe electric power system for same |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87101347A (en) * | 1987-06-11 | 1988-12-28 | 张作庆 | The high-voltage inverted electric welding machine of mining transistor DC |
| CN1663728A (en) * | 2004-03-01 | 2005-09-07 | 株式会社大亨 | Soft-switching half-bridge inverter power supply system |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07118641B2 (en) * | 1987-05-07 | 1995-12-18 | オリジン電気株式会社 | Driving circuit for semiconductor switching element |
| JPH04217877A (en) * | 1990-12-19 | 1992-08-07 | Hitachi Seiko Ltd | Overcurrent protective device for inverter |
| JPH09140122A (en) * | 1995-11-10 | 1997-05-27 | Nippon Electric Ind Co Ltd | Igbt driving reverse bias circuit |
| US6498321B1 (en) * | 2001-04-09 | 2002-12-24 | Lincoln Global, Inc. | System and method for controlling an electric arc welder |
| JP2010284709A (en) * | 2009-06-15 | 2010-12-24 | Daihen Corp | Power source device |
-
2010
- 2010-11-24 JP JP2010260905A patent/JP5584101B2/en active Active
-
2011
- 2011-11-16 CN CN201110363285.1A patent/CN102545620B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87101347A (en) * | 1987-06-11 | 1988-12-28 | 张作庆 | The high-voltage inverted electric welding machine of mining transistor DC |
| CN1663728A (en) * | 2004-03-01 | 2005-09-07 | 株式会社大亨 | Soft-switching half-bridge inverter power supply system |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2012115009A (en) | 2012-06-14 |
| CN102545620A (en) | 2012-07-04 |
| JP5584101B2 (en) | 2014-09-03 |
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