CN101850927B - Suspended magnet power circuit - Google Patents
Suspended magnet power circuit Download PDFInfo
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- CN101850927B CN101850927B CN2010101548250A CN201010154825A CN101850927B CN 101850927 B CN101850927 B CN 101850927B CN 2010101548250 A CN2010101548250 A CN 2010101548250A CN 201010154825 A CN201010154825 A CN 201010154825A CN 101850927 B CN101850927 B CN 101850927B
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Abstract
The invention provides a suspended magnet power circuit, which can has simple structure, low heating, high reliability and low cost. A structure in parallel connection with buffer circuits (45a-45d) having contact switches (41a-41d) is arranged in an H bridge type circuit portion (4) which controls power supply to a suspended magnet (2). The buffer circuits (45a-45d) could absorb unnecessary arc voltage so that the contact switches are used instead of conventional non-contact switches. Therefore, the invention can inhibit heating without a cooling device and simplifies the device structure and has advantages of low cost, low danger and easy maintenance owing to the contact switches (41a-41d) instead of conventional non-contact switches.
Description
The application advocates the preceence based on the Japanese patent application of on March 31st, 2009 application 2009-087558 number.The full content of its application is quoted in this manual through reference.
Technical field
The present invention relates to a kind of suspended magnet power circuit.
Background technology
Usually, the known lifting magnet that has in loading and unloading operation or build the iron plate that is used in the operation etc. to sling.As lifting magnet, except lifting magnet, be equipped on the lifting magnet of vehicle in addition as the equipment of factory etc.When using lifting magnet, lifting magnet is carried out excitation, and make it the absorption and the iron plate of slinging.And, when putting down iron plate, lifting magnet is carried out demagnetization.
In patent documentation 1, record the excitation of carrying out lifting magnet and the crane magnet driving circuit of demagnetization.These crane magnet driving circuits possess H bridge circuit portion, and this H bridge circuit portion has 4 switchover elements and 4 diodes, and the excitation of control lifting magnet.In the crane magnet driving circuit of patent documentation 1 record, as 4 switchover elements use noncontacting switches of H bridge circuit portion.
At this, noncontacting switch is meant the switch with the contact that mechanically contacts, and is semiconductor switchs such as transistor.
Patent documentation 1: TOHKEMY 2007-119160 communique
Yet in crane magnet driving circuit, when carrying out excitation and the demagnetization of lifting magnet, the switchover element of H bridge circuit portion carries out switch operating.Yet, because the internal resistance of noncontacting switch is bigger, so if noncontacting switch is used in the switchover element of H bridge circuit portion, because heating becomes big, so need cooling mechanism such as air cooling fan.Therefore, the problem that exists the structure of device to complicate.
And, have the problem of durability of the quartz conductor noncontacting switch of voltage withstand aspect.The quartz conductor noncontacting switch possesses IC, cond, resistance, printed base plate etc., compares with contact switch, has the worry of et out of order.Require to reduce the danger of et out of order in the contact, further improve reliability.
Summary of the invention
Therefore, the objective of the invention is to, provide a kind of and can realize the low suspended magnet power circuit that generates heat and can realize the raising of reliability with simple structure.
Suspended magnet power circuit of the present invention; To the lifting magnet supply capability; It is characterized in that possessing H bridge circuit portion, this H bridge circuit portion has: the 1st switchover element and the 2nd switchover element; Between hot side power supply and low potential side power supply, be connected in series successively, the node between above-mentioned the 1st switchover element and the 2nd switchover element is connected with an end of above-mentioned lifting magnet; The the 3rd and the 4th switchover element is connected in series between above-mentioned hot side power supply and above-mentioned low potential side power supply successively, and the node between above-mentioned the 3rd switchover element and the 4th switchover element is connected with the other end of above-mentioned lifting magnet; And mechanism is used in switching-over; And; This H bridge circuit portion control is to the supply of the electric power of above-mentioned lifting magnet; In above-mentioned the 1st switchover element to the 4 switchover elements at least one used contact switch for exchanging, and further possesses buffer circuit, and this buffer circuit is connected in parallel with above-mentioned the interchange with contact switch.
In contact switch, when conversion conducting state and nonconducting state, bigger arc discharge takes place sometimes.According to this invention; Controlling in the H bridge circuit portion that the electric power of lifting magnet is supplied with; Because be to possess switching-over, and possess the structure of the interchange of being connected in parallel with the buffer circuit of contact switch with mechanism (for example, diode); So can absorb N/R voltage, and can the electric arc of blocking-up during the contact be decreased in use and the life-span aspect can not become the size of problem.That is, can electric arc be maintained suitable size and block the contact.Thus, can close the mobile DC current of turning as lifting magnet of the load with big inductance through exchanging with contact switch (exchanging the universal contactor of usefulness).And, because be possess buffer circuit, switching-over with mechanism, interchange with the structure of contact switch, so can suppress the heating on the contact, do not need necessary in the past cooling mechanism and simplification that can the implement device structure.And, use contact switch through use exchanging, can improve the raising of the problem and the reliability that can implement device of durability.
At this, also can at least 1 in the 1st switchover element to the 4 switchover elements be set as noncontacting switch.According to this structure, because possess switch speed ratio noncontacting switch faster, so can not damage the low heating of realization, the raising of reliability, cost degradation under the controlled prerequisite of lifting magnet.
The invention effect
According to suspended magnet power circuit of the present invention, can realize the raising and the cost degradation of low heating and realization reliability with simple structure.
Description of drawings
Fig. 1 is the circuit diagram of the related suspended magnet power circuit of expression embodiment of the present invention.
Fig. 2 is the figure that the electric current in the excited work pattern of expression suspended magnet power circuit shown in Figure 1 flows.
Fig. 3 is the figure that the electric current in the excited work pattern of expression suspended magnet power circuit shown in Figure 1 flows.
Fig. 4 is the figure that the electric current in the demagnetization mode of operation of expression suspended magnet power circuit shown in Figure 1 flows.
Fig. 5 is the figure that the electric current in the demagnetization mode of operation of residue magnetic force of expression suspended magnet power circuit shown in Figure 1 flows.
Fig. 6 is the circuit diagram of the related suspended magnet power circuit of expression another embodiment of the present invention.
Description of reference numerals
1,1A-suspended magnet power circuit, 2-lifting magnet, 3-direct current converter section, 4-H bridge circuit portion; Energy absorbing portion is used in the 5-demagnetization, 31a～31f-diode, 41a～41d-switchover element (contact switch); 42a～42d-switching-over is with diode (mechanism is used in switching-over), 45a～45d-buffer circuit, 46a～46d-resistance unit; 47a～47d-capacity cell, 49a-switchover element (noncontacting switch), 51-capacity cell.
The specific embodiment
Below, with reference to accompanying drawing preferred implementation of the present invention is elaborated.In addition, for identical or cooresponding part additional phase Reference numeral together among each figure.
Fig. 1 is the circuit diagram of the related suspended magnet power circuit of expression embodiment of the present invention.Suspended magnet power circuit 1 shown in Figure 1 is the power circuit to lifting magnet 2 supply capabilities.Suspended magnet power circuit 1 is to carry out the excitation of lifting magnet 2 and the circuit of demagnetization, possesses direct current converter section 3, H bridge circuit portion 4, demagnetization with energy absorbing portion 5.
Direct current converter section 3 will be by the alternating-current voltage/AC voltage V of three-phase alternating-current supply ACG (electrical generator) supply
AC1～V
AC3Convert vdc V to
DCDirect current converter section 3 has positive side mouth 3a and minus side mouth 3b, and with the direct supply voltage V that produces
DCBe provided between positive side mouth 3a and the minus side mouth 3b.In this embodiment, positive side mouth 3a is as hot side power supply performance function, and minus side mouth 3b is as low potential side power supply performance function.In addition, direct current converter section 3 also can be the mode that alternating-current voltage/AC voltage is converted to vdc from single phase alternating current power supply.And, when electrical generator is dynamo generator, also the direct current converter section can be set.
The direct current converter section 3 of this embodiment is made up of the bridge circuit that comprises 6 diode 31a～31f, carries out three phase full wave rectification.Particularly, among diode 31a～31f, diode 31a and 31b are connected in series, and diode 31c and 31d are connected in series, and diode 31e and 31f are connected in series.And, the group that constitutes by diode 31a and 31b, the group that constitutes by diode 31c and 31d, the group connection parallel with one another that constitutes by diode 31e and 31f.And an end of the negative side of these diode groups is connected electrically in positive side mouth 30a, and the other end of side of the positive electrode is connected electrically in minus side mouth 30b.
And, between diode 31a and diode 31b, be electrically connected with the AC power cord 11a that extends from the phase terminals for power supplies of three-phase alternating-current supply ACG.Between diode 31c and diode 31d, be electrically connected with the AC power cord 11b that extends from the other phase terminals for power supplies of three-phase alternating-current supply ACG.Between diode 31e and diode 31f, be electrically connected with the AC power cord 11c that extends from another other phase terminals for power supplies of three-phase alternating-current supply ACG.In addition, in addition the direct current converter section for example also can or use the mixed type bridge circuit of diode and IGCT to constitute by the pure bridge circuit that uses IGCT.When the direct current converter section is made up of pure bridge circuit or mixed type bridge circuit, IGCT through not shown phase control circuit with the expectant control angle by phase control.
The excitation and the demagnetization of H bridge circuit portion 4 control lifting magnets 2.H bridge circuit portion 4 is by comprising the 1st～the 4th switchover element 41a～41d, being connected electrically in the H bridge circuit formation of the switching-over of the 1st～the 4th between the 1st～the 4th switchover element 41a～41d drain-source utmost point separately (translocation stream) with diode (switching-over is with mechanism, the 1st～the 4th rectifier cell) 42a～42d.
Specifically, the end of the 1st switchover element 41a is connected the positive side mouth 3a of direct current converter section 3, and the other end of the 1st switchover element 41a is connected the end of the 2nd switchover element 41b.The other end of the 2nd switchover element 41b is connected the minus side mouth 3b of direct current converter section 3.On the other hand, the end of the 3rd switchover element 41c is connected the positive side mouth 3a of direct current converter section 3, and the other end of the 3rd switchover element 41c is connected the end of the 4th switchover element 41d.The other end of the 4th switchover element 41d is connected the minus side mouth 3b of direct current converter section 3.
And; 1st, the 2nd, the 4th switching-over is connected to the other end of the 1st, the 2nd, the 4th switchover element 41a, 41b, 41d with the positive pole of diode 42a, 42b, 42d, and the 1st, the 2nd, the 4th commutates is connected to the end of the 1st, the 2nd, the 4th switchover element 41a, 41b, 41d with the negative pole of diode 42a, 42b, 42d.And the end of the other end of the 1st switchover element 41a and the 2nd switchover element 41b is connected an end of lifting magnet 2, and the end of the other end of the 3rd switchover element 41c and the 4th switchover element 41d is connected the other end of lifting magnet 2.
And; The 3rd switching-over is connected the other end of the 3rd switchover element 41c with the positive pole of diode 42c; The 3rd switching-over is not the positive side mouth 3a side of direct connection at direct current converter section 3 with the negative pole of diode 42c, but is connected the positive side mouth 3a side of direct current converter section 3 through resistance unit 46e.For all energy with lifting magnet 2 send back to demagnetization with energy absorbing portion 5, need big capacitor, so transfer heat energy to and only send necessary amount back to demagnetization with energy absorbing portion 5 with resistance unit 46e.
The the 1st～the 4th switchover element 41a～41d control terminal separately is connected not shown control circuit, the 1st～the 4th a switchover element 41a～41d end and control current (or the control voltage) control of the conducting state between the other end through being provided by this control circuit separately.
The the 1st～the 4th switchover element 41a～41d exchanges with contact switch (exchange and use electromagnetic contactor).Use contact switch as exchanging, the interchange that can use the switch that conduct has the contact that mechanically contacts is with the mechanical switch of electromagnetic contactor (MC switch) etc.
Demagnetization is to be used to absorb the circuit part of savings at the energy of lifting magnet 2 when carrying out the demagnetization of lifting magnet 2 with energy absorbing portion 5.Demagnetization is connected between the positive side mouth 3a and minus side mouth 3b of direct current converter section 3 with energy absorbing portion 5.Demagnetization has capacity cell 51 with energy absorbing portion 5.In addition, can use various circuit structures as demagnetization with energy absorbing portion 5.
H bridge circuit portion 4 further possesses buffer circuit 45a～45d.Buffer circuit 45a～45d is connected in parallel with the 1st～the 4th switchover element 41a～41d respectively.
Equally, buffer circuit 45b possesses resistance unit 46b, capacity cell 47b, diode 48b.Resistance unit 46b and capacity cell 47b are connected in series, and are connected in parallel to diode 48b at resistance unit 46b.Particularly, the positive pole of diode 48b is connected the node between resistance unit 46b and the capacity cell 47b, and the negative pole of diode 48b is connected the other end of resistance unit 46b.In addition, the electric capacity of capacity cell 47b for example becomes 100 μ F.
Equally, buffer circuit 45c possesses resistance unit 46c, capacity cell 47c, diode 48c.Resistance unit 46c and capacity cell 47c are connected in series, and are connected in parallel to diode 48c at resistance unit 46c.Particularly, the positive pole of diode 48c is connected the node between resistance unit 46c and the capacity cell 47c, and the negative pole of diode 48c is connected the other end of resistance unit 46c.In addition, the electric capacity of capacity cell 47c for example becomes 100 μ F.
Equally, buffer circuit 45d possesses resistance unit 46d, capacity cell 47d, diode 48d.Resistance unit 46d and capacity cell 47d are connected in series, and are connected in parallel to diode 48d at resistance unit 46d.Particularly, the positive pole of diode 48d is connected the node between resistance unit 46d and the capacity cell 47d, and the negative pole of diode 48d is connected the other end of resistance unit 46d.In addition, the electric capacity of capacity cell 47d for example becomes 100 μ F.
Then, on one side with reference to Fig. 2～Fig. 5 the work of suspended magnet power circuit 1 is described on one side.The figure that the electric current in each mode of operation of suspended magnet power circuit shown in Figure 1 flows is represented in Fig. 2～5th.
(the excited work pattern of lifting magnet)
Make the 1st switchover element 41a and the 4th switchover element 41d conducting of H bridge circuit portion 4.Thus, as shown in Figure 2, exciting current I1 flows at the minus side mouth 3b of the positive side mouth 3a of direct current converter section 3, the 1st switchover element 41a, lifting magnet the 2, the 4th switchover element 41d, direct current converter section 3.
Then, be set as the 1st switchover element 41a non-conduction.Thus, as shown in Figure 3, back flow current I2 flows with diode 42b in lifting magnet the 2, the 4th switchover element 41d, the 2nd rectification.Make 1st switchover element 41a once more conducting thereafter.Thus, as shown in Figure 2, exciting current I1 flows.
Like this, through switching the 1st switchover element 41a, lifting magnet 2 is by the excitation and the iron plate etc. that can adsorb and sling.In addition, the 4th switchover element 41d does not carry out switch operating.
(the demagnetization mode of operation of lifting magnet)
The 1st switchover element 41a of H bridge circuit portion 4 and the 4th switchover element 41d are set as non-conduction, the voltage of lifting magnet 2 are reversed (anti-translocation).Thus; As shown in Figure 4; Erasing current I3 flows in capacity cell the 51, the 2nd diode 48b of energy absorbing portion 5 in lifting magnet the 2, the 3rd diode 48c, demagnetization, and savings moves in the capacity cell 51 at the energy of lifting magnet 2, and savings is in capacity cell 51.
Thus, lifting magnet 2 is by demagnetization and can put down iron plate of absorption etc.
(the demagnetization mode of operation of the residue magnetic force of lifting magnet)
At this, lifting magnet 2 has residue magnetic force because of the hysteresis characteristic.Therefore, make the 2nd switchover element 41b and the 3rd switchover element 41c conducting of H bridge circuit portion 4.Thus, as shown in Figure 5, the erasing current I4 of residue magnetic force is mobile in capacity cell the 51, the 3rd switchover element 41c of energy absorbing portion 5, lifting magnet the 2, the 2nd switchover element 41b in demagnetization.That is, at the electric charge of capacity cell 51, erasing current I4 with the reciprocal residue magnetic force of erasing current I3 flows in lifting magnet 2 through savings.
Thus, lifting magnet 2 also can be put down the iron plate of absorption etc. by demagnetization.When carrying out the demagnetization of this residue magnetic force, the 2nd and the 3rd switchover element 41b, 41c do not carry out switch operating.Because use the smaller contact switch of internal resistance at the 2nd and the 3rd switchover element 41b, 41c, heating is lowered.
The suspended magnet power circuit 1 related according to this embodiment; In control in the H bridge circuit portion 4 of the supply of the electric power of lifting magnet 2; Owing to be to possess switching-over with diode 42a～42d; And the structure that possesses the buffer circuit 45a～45d that is connected in the 1st～the 4th switchover element 41a～41d (exchange use contact switch) in parallel so pass through these buffer circuits 45a～45d, can absorb and consumes the electric energy of staying in the inductance that is made up of part, distribution.Thus, absorb the N/R arc voltage and electric arc can be with the blocking-up contact time is reduced in use and the unchallenged size in life-span aspect.Can suppress the generation of the arc discharge of the 1st～the 4th switchover element 41a～41d.Thus, can turn off the DC current that flows to load like lifting magnet 2 through exchanging with universal contactor with big inductance.
And; In suspended magnet power circuit 1; Since be possess buffer circuit 45a～45d, switching-over with diode 42a～42d, exchange structure with contact switch 41a～41d, so can suppress to generate heat, do not need necessary in the past cooling mechanism and simplification that can the implement device structure.
And contact switch is compared with noncontacting switch in the past, and cheap and also maintenance easily is so can realize the raising and the cost degradation of reliability.And, need not be used to blow out the device of arc discharge, so simplification and cost degradation that can the implement device structure yet.In addition, contact switch is meant to exchange uses electromagnetic contactor, as the mechanical switch of the relay of the switch with the contact that mechanically contacts etc.
In addition, the invention is not restricted to this above-mentioned embodiment, can carry out various distortion.In the suspended magnet power circuit 1 of above-mentioned embodiment; The the 1st～the 4th switchover element 41a～41d is set as contact switch, but also as long as at least 1 in the 1st～the 4th switchover element is contact switch and the structure that further possesses the buffer circuit that is connected in parallel with contact switch.
Fig. 6 is the circuit diagram of the related suspended magnet power circuit of expression another embodiment of the present invention.The difference of suspended magnet power circuit 1A shown in Figure 6 and suspended magnet power circuit 1 shown in Figure 1 is: replace possessing the 1st switchover element 49a as contact switch as the 1st switchover element 41a of noncontacting switch.
Like this, the 1st switchover element 49a is owing to be switch speed than noncontacting switch faster, thus can improve the constant potential control that is added to the voltage on the lifting magnet 2 or electric current decide the controlled of current control.
In addition,, the voltage that is added to lifting magnet 2 can be adjusted, and the energy of savings can be adjusted at lifting magnet 2 through adjusting the switching proportion of the 1st switchover element 41a.Thus, for example can adjust the adsorption strength of iron plate.In this embodiment, because the switch speed of the 1st switchover element 41a is than very fast, so also can improve the controlled of this adjustment.
And the 1st～the 4th diode 42a～42d of the diode 31a～31f of direct current converter section 3, H bridge circuit portion 4 can replace with the element beyond the diode as long as possess rectification function in a direction.
And, in the above-described embodiment, though illustration CRD type buffer circuit, buffer circuit 45a～45d is not limited to this embodiment.For example, also can be the buffer circuit that only constitutes by capacity cell (C), also can be the buffer circuit that constitutes by capacity cell and resistance unit (R).And, also can be the buffer circuit that possesses a plurality of capacity cells.And the electric capacity of capacity cell can be different by buffer circuit.
And, in the above-described embodiment,, but also can switchover element be used with mechanism as switching-over as the diode 42a～42d that commutated with mechanism's illustration.
Claims (2)
1. a suspended magnet power circuit to the lifting magnet supply capability, is characterized in that,
Possesses H bridge circuit portion; This H bridge circuit portion has: the 1st switchover element and the 2nd switchover element; Between hot side power supply and low potential side power supply, be connected in series successively, the node between above-mentioned the 1st switchover element and the 2nd switchover element is connected with an end of above-mentioned lifting magnet; The the 3rd and the 4th switchover element is connected in series between above-mentioned hot side power supply and above-mentioned low potential side power supply successively, and the node between above-mentioned the 3rd switchover element and the 4th switchover element is connected with the other end of above-mentioned lifting magnet; And switching-over use mechanism, and this H bridge circuit portion controls the supply to the electric power of above-mentioned lifting magnet,
In above-mentioned the 1st switchover element to the 4 switchover elements at least one used contact switch for exchanging,
Further possess buffer circuit, this buffer circuit is connected in parallel with above-mentioned the interchange with contact switch.
2. suspended magnet power circuit as claimed in claim 1 is characterized in that,
In above-mentioned the 1st switchover element to the 4 switchover elements at least one is noncontacting switch.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2009087558A JP5117438B2 (en) | 2009-03-31 | 2009-03-31 | Power supply circuit for lifting magnet |
| JP087558/2009 | 2009-03-31 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101850927A CN101850927A (en) | 2010-10-06 |
| CN101850927B true CN101850927B (en) | 2012-11-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010101548250A Active CN101850927B (en) | 2009-03-31 | 2010-03-30 | Suspended magnet power circuit |
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| JP (1) | JP5117438B2 (en) |
| CN (1) | CN101850927B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102897642B (en) * | 2011-07-26 | 2014-10-01 | 宝山钢铁股份有限公司 | Capacitor inversion type magnetizing and demagnetizing lifting electromagnet |
| CN102897643B (en) * | 2011-07-26 | 2014-10-01 | 宝山钢铁股份有限公司 | Electromagnet coil tap type magnetizing and demagnetizing lifting electromagnet |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1182972A (en) * | 1996-10-07 | 1998-05-27 | 东芝株式会社 | Electric power conversion system |
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| JPS60144288A (en) * | 1983-12-29 | 1985-07-30 | 神鋼電機株式会社 | Power supply circuit for hanging electromagnet |
| JPS61156491U (en) * | 1985-03-20 | 1986-09-27 | ||
| EP0262521B1 (en) * | 1986-09-30 | 1991-04-17 | Siemens Aktiengesellschaft | Device for controlling the electrical voltage at the rotating exciter winding of an electrical generator |
| JPH06104289B2 (en) * | 1988-07-20 | 1994-12-21 | フジ磁工株式会社 | Degaussing device for electromagnetic chuck |
| US5317122A (en) * | 1992-01-28 | 1994-05-31 | Mitsubishi Denki Kabushiki Kaisha | Discharge-processing electric power-source assembly |
| JPH08255670A (en) * | 1995-03-20 | 1996-10-01 | Juki Corp | Electric heater driving device |
| JPH09245586A (en) * | 1996-03-12 | 1997-09-19 | Tai-Haa Yan | Arc-extinguishing circuit device for cutting off dc power source |
| JPH10174424A (en) * | 1996-10-07 | 1998-06-26 | Toshiba Corp | Power converter |
| JP2000036238A (en) * | 1998-04-06 | 2000-02-02 | Shigeisa Imoto | Switch circuit |
| JP2000153983A (en) * | 1998-11-18 | 2000-06-06 | Sakato Kosakusho:Kk | Power circuit for lifting magnet |
| JP2000156967A (en) * | 1998-11-19 | 2000-06-06 | Meidensha Corp | Turn-on test circuit for current driving type power semiconductor element |
| JP3395145B2 (en) * | 2000-03-17 | 2003-04-07 | 住友重機械工業株式会社 | Lifting magnet device |
| JP4335198B2 (en) * | 2005-10-27 | 2009-09-30 | 住友重機械工業株式会社 | Lifting magnet drive circuit |
| JP2007301703A (en) * | 2006-05-15 | 2007-11-22 | Ryobi Ltd | Electric power tool |
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2009
- 2009-03-31 JP JP2009087558A patent/JP5117438B2/en active Active
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2010
- 2010-03-30 CN CN2010101548250A patent/CN101850927B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1182972A (en) * | 1996-10-07 | 1998-05-27 | 东芝株式会社 | Electric power conversion system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101850927A (en) | 2010-10-06 |
| JP5117438B2 (en) | 2013-01-16 |
| JP2010235293A (en) | 2010-10-21 |
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