CN100355194C - Topological structure of switch power supply changer - Google Patents
Topological structure of switch power supply changer Download PDFInfo
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- CN100355194C CN100355194C CNB2004100259296A CN200410025929A CN100355194C CN 100355194 C CN100355194 C CN 100355194C CN B2004100259296 A CNB2004100259296 A CN B2004100259296A CN 200410025929 A CN200410025929 A CN 200410025929A CN 100355194 C CN100355194 C CN 100355194C
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Abstract
The present invention relates to a topological structure of a switch power supply converter, which comprises a power supply, a converter and a load, wherein both ends of the power supply are connected with the input end of the converter of a switch power supply or the input end of a switch power supply isolation converter; the output end of the converter is connected with the power supply in series and then is connected with the load in parallel. In the present invention, the output voltage of the switch power supply converter is connected with the power supply voltage in series and simultaneously drives the load; the power supply directly provides a part of power for the load, and thus, the requirements for the power of the switch power supply converter is lightened. The power supply voltage and the output voltage of the switch power supply isolation converter are connected in series and then are used as the input voltage of the switch power supply isolation converter, and thus, a system still can output normal power even when the power supply voltage is low.
Description
Technical field
The invention belongs to the converter of electric power, electronics, the energy, traffic and field of environment protection, particularly a kind of topological structure of switching power converters.
Background technology
With regard to basic pwm converter major loop topological structure, multiple converters such as Buck, Boost, Buck-Boost, Cuk are arranged at present.The circuit structure of the switching mode voltage stabilizer that develops out on this basis (DC/DC converter) has multiple:
(1) by the type of drive branch, self-excitation type and separated exciting are arranged;
(2) by the working method branch of DC/DC converter: 1. single-ended formula and deexcitation formula, push-pull type, semibridge system, full-bridge type etc. of just encouraging; 2. voltage-dropping type, booster type and buck-boost type etc.;
(3) by the circuit bank composition, the mode of resonance and the anharmonic vibration shape are arranged;
(4) by the control mode branch: 1. pulse width modulation (PWM) formula; 2. pulse frequency modulated (PFM) formula; 3. PWM and PFM are hybrid;
(5) whether isolate and feedback control signal coupled modes branch by power supply, isolated, non-isolated and transformer coupled formula, photoelectric coupling type etc. are arranged.
More than the combination of these modes can constitute the switching mode voltage stabilizer of multiple mode.
A common trait of these conventional DC/DC converters is: as energy source, these energy sources are received (energy) input of conventional DC/DC power supply with battery or capacitor or the like, (energy) output termination load of conventional DC/DC power supply.Conventional DC/DC power supply usually with its output voltage as the Voltage Feedback source, promptly its feedback voltage generally is taken from the voltage of conventional DC/DC power output end.
The energy density of present energy storage capacitor has been brought up to very high level, but when discharge, although still there are a lot of energy in the capacitor, its voltage still can constantly reduce along with the minimizing of the depositing quantity of electric charge, and existing conventional DC/DC power supply provides a technology path for addressing this problem.But, when being used for this purpose, existing conventional DC/DC power supply also exists following problem:
(1) power demand is big, so the volume of DC/DC power supply is big, cost is high, efficient is low, heat radiation is particularly thorny;
(2) efficient is low when the capacitor terminal voltage is low, even is difficult to work;
(3) when being used to drive DC motor, people are the demand that the Buck converter is taken into account startup and speed governing with DC chopper usually, but the terminal voltage of capacitor can constantly reduce, need to use booster converter again, this has just limited the feasibility of energy storage capacitor replacement storage battery to a great extent for this reason.
Summary of the invention
The object of the present invention is to provide a kind of simply, efficient, and can make energy storage capacitor replace the topological structure of the switching power converters of storage battery.
For achieving the above object, the technical solution used in the present invention is: the two ends of power supply are in parallel with the input of switching power converters or Switching Power Supply isolated converter, and are common in parallel with load after the output of converter is connected with power supply.
Another characteristics of the present invention are: the output and the load of converter also are in parallel by diode, also are connected with switch between the negative pole of power supply and the load; Power supply also is in series with the series circuit that starts power supply and diode, starts power supply and diode and is in parallel with the output of converter again; Power supply is with after the output of converter is connected, and is in parallel with the input of load and converter respectively; Also in parallel by diode between the input of power supply and converter, the positive pole of converter input also is connected with switch with the positive pole that converter is exported; Switching power converters comprise first capacitor and be connected with the negative pole of first capacitor be with centre tapped inductor, the positive pole of first capacitor is connected with the two ends of inductor with second diode by first diode respectively, one end of inductor also is connected with the negative pole of power supply by the 3rd diode, and the other end of inductor is connected with the negative pole of power supply by first switching tube; Also be parallel with the second switch pipe on the 3rd diode of switching power converters, go back parallel diode on first switching tube; The negative pole of first capacitor of Switching Power Supply isolated converter also is connected with first switching tube by first transformer, one end of the first transformer primary coil is connected with the negative pole of first capacitor, the other end of the first transformer primary coil links to each other with the negative pole of power supply by first switching tube, the end of the same name of the secondary coil of first transformer links to each other with the other end of second capacitor with the secondary coil of first transformer by the 5th diode, and the positive pole of first capacitor links to each other with the negative electrode of the 5th diode by the 6th diode; The output voltage of Switching Power Supply isolated converter is added on first capacitor, it is in parallel after first capacitor is connected with power supply with load, the negative pole of first capacitor of Switching Power Supply isolated converter is connected with the centre cap of the primary coil of second transformer, the negative pole of first capacitor also is connected with the centre cap of the secondary coil of second transformer, the two ends of the primary coil of second transformer link to each other with the negative pole of power supply with the second switch pipe by first switching tube respectively, the end of the same name of first winding of the secondary coil of second transformer links to each other with the centre cap of the 7th diode with the secondary coil of second transformer by the 3rd capacitor, the end of the same name of second winding of the secondary coil of second transformer is that the centre cap of secondary coil is connected with the other end of the 4th capacitor with second winding of the secondary coil of second transformer by the 8th diode, the positive pole of first capacitor links to each other with the negative electrode of the 7th diode by the 9th diode, and the positive pole of first capacitor also links to each other with the negative electrode of the 8th diode by the tenth diode.
The present invention is with the output voltage of switching power converters and supply voltage is in series and drive load simultaneously, because power supply directly provides the part power demand to load, so alleviated the power demand to switching power converters.
Also since the back that supply voltage and Switching Power Supply isolated converter output voltage can be in series as the input voltage of Switching Power Supply isolated converter, so when supply voltage is low system's normal power output still.
Description of drawings
Fig. 1 is an overall structure block diagram of the present invention;
Fig. 2 is the topology diagram of the embodiment of the invention 1;
Fig. 3 is the overall structure block diagram of the embodiment of the invention 2;
Fig. 4 is the overall structure block diagram of the embodiment of the invention 3;
Fig. 5 is the topology diagram of the embodiment of the invention 4;
Fig. 6 is the topology diagram of the embodiment of the invention 5;
Fig. 7 is the topology diagram of the embodiment of the invention 6;
Fig. 8 is the topology diagram of the embodiment of the invention 7;
Fig. 9 is the topology diagram of the embodiment of the invention 8;
Figure 10 is the topology diagram of the embodiment of the invention 9;
Embodiment
Below in conjunction with accompanying drawing structural principle of the present invention and operation principle are described in further detail.
Referring to Fig. 1, the present invention includes power supply 1, the two ends of power supply 1 are in parallel with the input of switching power converters or Switching Power Supply isolated converter 3, it is common in parallel after the output of converter 3 is connected with power supply 1 with load 2, power supply 1 provides the part power demand directly for load 2, and another part power demand is provided by converter 3.
Embodiment 1: referring to Fig. 2, the two ends of power supply 1 are in parallel with the input of switching power converters 3, switching power converters 3 comprise first capacitor 15 and be connected with the negative pole of first capacitor 15 be with the centre tapped air gap inductor 10 that adds, the positive pole of first capacitor 15 is respectively by diode 12,13 are connected with the two ends of inductor 10, one end of inductor 10 also is connected by the negative pole of diode 14 with power supply 1, the other end of inductor 10 is connected with the negative pole of power supply 1 by first switching tube 11, also be connected with diode 4 between the output of switching power converters 3 and the load 2, also be connected with switch 5 between the negative pole of power supply 1 and the load 2.When 11 conductings of first switching tube, diode 12 conductings, diode 13,14 ends, inductor 10 charges and storage power in the magnetic core of inductor 10 to first capacitor 15 by diode 12, under the condition that switch 5 disconnects, provide energy by first capacitor 15 to load, under the condition of switch 5 closures, power supply 1 provides the part power demand directly for load 2, and another part power demand is by i.e. first capacitor, 15 power supplies of output of switching power converters 3.When first switching tube 11 ends, diode 13,14 conductings, diode 12 ends, inductor 10 discharges the energy of storage, and charges to first capacitor 15 by diode 13, under the condition that switch 5 disconnects, by diode 14 to power supply 1 recuperated energy, load 2 is 15 power supplies of first capacitor by the output of switching power converters 3, and under the condition of switch 5 closures, inductor 10 also charges to power supply 1 to load 2 power supplies and by diode 14 by the diode 14 and first capacitor 15.
Embodiment 2: referring to Fig. 3, it is common in parallel after power supply 1 is connected with the output of Switching Power Supply isolated converter 3 with the input of Switching Power Supply isolated converter 3, it is also common in parallel after the output of Switching Power Supply isolated converter 3 is connected with power supply 1 with load 2, power supply 1 also is in series with mutual startup power supply 6 of connecting, diode 7, starting power supply 6 and diode 7 is in parallel with the output of Switching Power Supply isolated converter 3 again, under the constant condition of power supply 1 terminal voltage, voltage height between C, D, then voltage is also high between A, B; Otherwise, C, voltage is low between D, A then, also low (utmost point when carrying out pulse-width modulation by control IC can think in the short time that the terminal voltage of power supply 1 remains unchanged to voltage between B, even if power supply 1 is an energy storage capacitor), so if think A, voltage is stable between B, feedback voltage should be got A, voltage between B, this voltage is the input voltage of Switching Power Supply isolated converter 3, it also is the terminal voltage of load 2, need to prove, power supply 1 is boosted and drives load 2 is not to have no to limit, for example, the terminal voltage of power supply 1 is 2V and supposes that it can provide big electric current arbitrarily that the energy conversion efficiency of establishing Switching Power Supply isolated converter 3 is 80%, so A, the upper limit (UL) of voltage is 10V between B.Present embodiment is applicable to the lower situation of power supply 1 voltage, start power supply 6 and power supply 1 simultaneously to switching power converters 3 intakes, the output voltage that starts back switching power converters 3 is greater than the terminal voltage that starts power supply 6, this moment, diode 7 ended, power supply 1 boosts the back simultaneously to load 2 power supplies as unique energy source by switching power converters 3, and this moment, power supply 1 directly provided the part power demand to load.Arrow among the figure is the sense of current.
Embodiment 3: referring to Fig. 4, the two ends of power supply 1 are in parallel with the input of Switching Power Supply isolated converter 3 by diode 8, common in parallel with load 2 after the output of Switching Power Supply isolated converter 3 is connected with power supply 1, the positive pole of the positive pole of Switching Power Supply isolated converter 3 inputs and Switching Power Supply isolated converter 3 outputs also is connected with switch 9.If power supply 1 is energy storage capacitor, and its terminal voltage is higher during beginning, at this moment switch 9 is disconnected; When the terminal voltage of power supply 1 is hanged down, make switch 9 closures.When switch 9 disconnects, diode 8 conductings, power supply 1 provides the part power demand directly for load 2, and another part power demand is provided by Switching Power Supply isolated converter 3; When switch 9 was closed, diode 8 ended, power supply 1 with power and common supplying power for input end after the output of Switching Power Supply isolated converter 3 connect jointly to Switching Power Supply isolated converter 3 to load 2.
Embodiment 5, and referring to Fig. 6, the switching power converters 3 of present embodiment is the CUK converter 18 of a routine, power supply 1 with after the output of switching power converters 3 is connected jointly to load 2 power supplies.The advantage of present embodiment is: under the condition on be used for electric bicycle etc., when starting, can switching tube not worked, the inductance on the right can play the effect of limiting starting current, avoiding direct current machine and mechanical device that it drove to be subjected to overstress impacts, the control voltage of speed governing does not need to isolate, promptly as long as regulate the resistance of swept resistance in the PWM control IC circuit.
Embodiment 6, referring to Fig. 7, in the present embodiment power supply 1 be in series with the output of switching power converters 3 again after the output of conventional CUK converter 18 is connected, and jointly to load 2 power supplies, the base stage of first switching tube 11 in the base stage of the 3rd switching tube 19 in the conventional CUK converter 18 and the switching power converters 3 links to each other, and the emitter and the diode 14 of first switching tube 11 in the emitter of the 3rd switching tube 19 in the CUK converter 18 of routine and the switching power converters 3 link to each other.
Embodiment 7: referring to Fig. 8, power supply 1 is in parallel with load 2 after first capacitor 15 is connected with the output of Switching Power Supply isolated converter 3 in the present embodiment, the negative pole of first capacitor 15 of Switching Power Supply isolated converter 3 is connected with the end of the primary coil L1 of first transformer 20, the other end of L1 links to each other with the negative pole of power supply 1 by first switching tube 11, the end of the same name of the secondary coil L2 of first transformer 20 links to each other with the other end of L2 with second capacitor 21 by diode 22, and the positive pole of first capacitor 15 links to each other with the negative electrode of diode 22 by diode 23.When 11 conductings of first switching tube, first transformer 20 is storage power in second capacitor 21 by secondary coil and diode 22, and while storage power in the magnetic core of first transformer 20, and this moment, diode 23 ended diode 22 conductings.When first switching tube 11 disconnected, diode 22 ended, diode 23 conductings, and 21 one-tenth series relationship of the L2 and second capacitor, and to 15 chargings of first capacitor, power supply 1, L2 and second capacitor 21 also become series relationship and while to load 2 power supplies at this moment.Compare with common Switching Power Supply isolated converter, when L2 is identical with the L1 turn ratio, can obtain higher voltage gain.
Embodiment 8: referring to Fig. 9, because Switching Power Supply isolated converter 3 is isolated converters among the embodiment 7, according to embodiment 2 and embodiment 3, also corresponding topological structure should be arranged, Fig. 9 provides the 3 corresponding topological structures with embodiment in the present embodiment, and its operation principle is referring to embodiment 7 and embodiment 3.
Embodiment 9: referring to Figure 10, power supply 1 is in parallel with load 2 after first capacitor 15 is connected with the output of Switching Power Supply isolated converter 3 in the present embodiment, the negative pole of first capacitor 15 of Switching Power Supply isolated converter 3 is connected with the centre cap of the primary coil L3 of second transformer 24, the negative pole of first capacitor 15 also is connected with the centre cap of the secondary coil L4 of second transformer 24, the two ends of L3 link to each other with the negative pole of second switch pipe 16 with power supply 1 by first switching tube 11 respectively, the end of the same name of first winding L 41 of the secondary coil of second transformer 24 links to each other with the centre cap of diode 26 with the secondary coil L4 of second transformer 24 by the 3rd capacitor 25, the end of the same name of second winding L 42 of the secondary coil of second transformer 24 is that the centre cap of secondary coil L4 is connected with the other end of the 4th capacitor 28 with second winding L 42 of the secondary coil of second transformer 24 by the 8th diode 27, the positive pole of first capacitor 15 links to each other with the input of diode 26 by diode 29, and the positive pole of first capacitor 15 also links to each other with the input of diode 27 by diode 30.When 11 conductings of first switching tube, second switch pipe 16 ends, second transformer 24 by second winding L 42 and the 8th diode 27 in the 4th capacitor 28 storage power and in magnetic core of transformer storage power, second transformer 24 charges to first capacitor 15 by first winding L 41 and the 3rd capacitor 25, the 9th diode 29, first winding L 41, the 3rd capacitor 25, the 9th diode 29 are also and power supply 1 series connection and jointly to load 2 power supplies, at this moment, the 7th diode 26, the tenth grade of pipe 30 end the 8th diode 27,29 conductings of the 9th diode; When first switching tube 11 ends, second switch pipe 16 conducting not yet, at this moment, the 7th diode 26,30 conductings of the tenth diode, the 8th diode 27, the 9th diode 29 end, second transformer 24 charges to first capacitor 15 by second winding L 42 and the 4th capacitor 28, the tenth diode 30, second winding L 42, the 4th capacitor 28, the tenth diode 30 are also and power supply 1 is connected and jointly to load 2 power supplies, first winding L 41 is passed through the 7th diode 26 to 25 chargings of the 3rd capacitor; After a time cycle, 16 conductings of second switch pipe, this moment, first switching tube 11 ended, and the 7th diode 26,30 conductings of the tenth diode, the 8th diode 27, the 9th diode 29 end, at this moment, second transformer 24 continues to 15 chargings of first capacitor by second winding L 42 and the 4th capacitor 28, the tenth diode 30, second winding L 42, the 4th capacitor 28, the tenth diode 30 are also and power supply 1 is connected and common the continuation to load 2 power supplies, and first winding L 41 is passed through the 7th diode 26 and continued to 25 chargings of the 3rd capacitor; When first switching tube 16 ends, first switching tube 11 conducting not yet, at this moment, the 8th diode 27,29 conductings of the 9th diode, the 7th diode 26, the tenth diode 30 end, second transformer 24 charges to first capacitor 15 by first winding L 41 and the 3rd capacitor 25, the 9th diode 29, first winding L 41, the 3rd capacitor 25, the 9th diode 29 are also and power supply 1 is connected and jointly to load 2 power supplies, second winding L 42 is passed through the 8th diode 27 to 28 chargings of the 4th capacitor.
Power supply of the present invention can be battery, capacitor an or the like energy source.Its advantage is: (1) according to the topological structure of circuit, the drive circuit of switching tube can be very simple; (2) compare with conventional converter, when the load power demand is a determined value, because power supply directly provides part power to load, thereby the power output demand of converter nature is just little, it is big that this has just solved the power demand that conventional converter ran into, the problem that the volume of switching power converters is big, cost is high, efficient is low, heat radiation is particularly thorny.
Also since the back that supply voltage and Switching Power Supply isolated converter output voltage can be in series as the input voltage of Switching Power Supply isolated converter, so when supply voltage is low system's normal power output still.
Claims (8)
1, a kind of topological structure of switching power converters is characterized in that: the two ends of power supply [1] are in parallel with the input of switching power converters or Switching Power Supply isolated converter [3], and are common in parallel with load [2] after the output of converter [3] is connected with power supply [1].
2, the topological structure of switching power converters according to claim 1 is characterized in that: the output of said converter [3] and load [2] also are in parallel by diode [4], also are connected with switch [5] between the negative pole of power supply [1] and the load [2].
3, the topological structure of switching power converters according to claim 1, it is characterized in that: said power supply [1] also is in series with the series circuit that starts power supply [6] and diode [7], and startup power supply [6] and diode [7] are in parallel with the output of converter [3] again; Power supply [1] is with after the output of converter [3] is connected, and is in parallel with the input of load [2] and converter [3] respectively.
4, the topological structure of switching power converters according to claim 1, it is characterized in that: also in parallel by diode [8] between the input of said power supply [1] and converter [3], the positive pole of converter [3] input also is connected with switch [9] with the positive pole that converter [3] is exported.
5, the topological structure of switching power converters according to claim 1, it is characterized in that: said switching power converters [3] comprise first capacitor [15] and be connected with the negative pole of first capacitor [15] be with centre tapped inductor [10], the positive pole of first capacitor [15] is connected with the two ends of second diode [13] with inductor [10] by first diode [12] respectively, one end of inductor [10] also is connected by the negative pole of the 3rd diode [14] with power supply [1], and the other end of inductor [10] is connected by the negative pole of first switching tube [11] with power supply [1].
6, the topological structure of switching power converters according to claim 5 is characterized in that: also be parallel with second switch pipe [16] on the 3rd diode [14] of said switching power converters [3], go back parallel diode [17] on first switching tube [11].
7, the topological structure of switching power converters according to claim 1, it is characterized in that: the negative pole of first capacitor [15] of said Switching Power Supply isolated converter [3] also is connected with first switching tube [11] by first transformer [20], one end of first transformer [20] primary coil [L1] is connected with the negative pole of first capacitor [15], the other end of first transformer [20] primary coil [L1] links to each other with the negative pole of power supply [1] by first switching tube [11], the end of the same name of the secondary coil [L2] of first transformer [20] links to each other with the other end of second capacitor [21] with the secondary coil [L2] of first transformer [20] by the 5th diode [22], and the positive pole of first capacitor [15] links to each other with the negative electrode of the 5th diode [22] by the 6th diode [23].
8, the topological structure of switching power converters according to claim 1, it is characterized in that: the output voltage of said Switching Power Supply isolated converter [3] is added on first capacitor [15], it is in parallel after first capacitor [15] is connected with power supply [1] with load [2], the negative pole of first capacitor [15] of Switching Power Supply isolated converter [3] is connected with the centre cap of the primary coil [L3] of second transformer [24], the negative pole of first capacitor [15] also is connected with the centre cap of the secondary coil [L4] of second transformer [24], the two ends of the primary coil [L3] of second transformer [24] link to each other with the negative pole of second switch pipe [16] with power supply [1] by first switching tube [11] respectively, the end of the same name of first winding [L41] of the secondary coil of second transformer [24] links to each other with the centre cap of the 7th diode [26] with the secondary coil [L4] of second transformer [24] by the 3rd capacitor [25], the end of the same name of second winding [L42] of the secondary coil of second transformer [24] is that the centre cap of secondary coil [L4] is connected with the other end of the 4th capacitor [28] with second winding [L42] of the secondary coil of second transformer [24] by the 8th diode [27], the positive pole of first capacitor [15] links to each other with the negative electrode of the 7th diode [26] by the 9th diode [29], and the positive pole of first capacitor [15] also links to each other with the negative electrode of the 8th diode [27] by the tenth diode [30].
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| CNB2004100259296A CN100355194C (en) | 2004-03-08 | 2004-03-08 | Topological structure of switch power supply changer |
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| CNB2004100259296A CN100355194C (en) | 2004-03-08 | 2004-03-08 | Topological structure of switch power supply changer |
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| CN1560988A CN1560988A (en) | 2005-01-05 |
| CN100355194C true CN100355194C (en) | 2007-12-12 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102655377B (en) * | 2012-04-25 | 2015-05-27 | 华为技术有限公司 | Voltage regulating circuit |
| CN104218795B (en) * | 2013-06-04 | 2017-09-22 | 台达电子工业股份有限公司 | Power inverter and its method of supplying power to |
| TWI556538B (en) | 2013-06-04 | 2016-11-01 | 台達電子工業股份有限公司 | Power supply system and method for converting power thereof |
| CN111884198A (en) * | 2020-05-20 | 2020-11-03 | 金国卫 | Energy-saving 5G load power supply |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1039685A (en) * | 1988-06-30 | 1990-02-14 | 菲利浦光灯制造公司 | Switched-mode power supply circuit |
| CN2101345U (en) * | 1991-10-04 | 1992-04-08 | 上海电子元件二厂 | Passive suppressor for source current harmonic distortion |
| CN1042382C (en) * | 1994-10-14 | 1999-03-03 | 松下电工株式会社 | Power converting system |
| CN1058357C (en) * | 1994-02-14 | 2000-11-08 | 弗莱德·欧·巴斯罗德 | Full wave buck boost power converter with buck power converter properties |
-
2004
- 2004-03-08 CN CNB2004100259296A patent/CN100355194C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1039685A (en) * | 1988-06-30 | 1990-02-14 | 菲利浦光灯制造公司 | Switched-mode power supply circuit |
| CN2101345U (en) * | 1991-10-04 | 1992-04-08 | 上海电子元件二厂 | Passive suppressor for source current harmonic distortion |
| CN1058357C (en) * | 1994-02-14 | 2000-11-08 | 弗莱德·欧·巴斯罗德 | Full wave buck boost power converter with buck power converter properties |
| CN1042382C (en) * | 1994-10-14 | 1999-03-03 | 松下电工株式会社 | Power converting system |
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Assignee: Changzhou Jutai Electronic Co., Ltd. Assignor: Geng Xianwen Contract fulfillment period: 2007.12.20 to 2013.12.19 contract change Contract record no.: 2008320000365 Denomination of invention: Topological structure of switch power supply changer Granted publication date: 20071212 License type: Exclusive license Record date: 2008.9.25 |
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Free format text: EXCLUSIVE LICENCE; TIME LIMIT OF IMPLEMENTING CONTACT: 2007.12.20 TO 2013.12.19 Name of requester: CHANGZHOU CITY JUTAI ELECTRONICS CO.,LTD. Effective date: 20080925 |
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Granted publication date: 20071212 |