CN1469537A - Flexible switching DC-DC converter with active energy discharging slot - Google Patents
Flexible switching DC-DC converter with active energy discharging slot Download PDFInfo
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- CN1469537A CN1469537A CNA021246122A CN02124612A CN1469537A CN 1469537 A CN1469537 A CN 1469537A CN A021246122 A CNA021246122 A CN A021246122A CN 02124612 A CN02124612 A CN 02124612A CN 1469537 A CN1469537 A CN 1469537A
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Abstract
The DC-DC converter includes one boost up converting circuit with one main switch and connected electrically with one first DC voltage to produce one second DC voltage via the on-off switching of the main switch; one resonant circuit comprising one single-way switch, one resonant capacitor and the first winding of one transformer and to make the main switch in the booster converting circuit conduct in one approximately zero voltage; and one active energy discharging slot circuit coupled magnetically to the first winding of the transformer to discharge the energy of the inductor in the transformer to turn off the single-way switch in the resonant circuit in one approximately zero current.
Description
(1) technical field
The relevant a kind of pulse-width modulation voltage-boosting converter of the present invention refers to the initiatively pulse-width modulation voltage-boosting converter of energy discharging slot circuit of application one especially.
(2) background technology
Fig. 1 is known pulse-width modulation (PWM) voltage-boosting converter (Boost Converter) 100.When a main switch 101 conductings (on), direct current power supply cumlative energy on a main inductance 103 of a full-wave rectifier 102 outputs, main diode 104 reverses biased at this moment.When this main switch 101 ends (off), load absorbs input and is stored in the electric energy of this main inductance 103, suppose that this main capacitance 105 is very big, in theory, this main switch 101 can be fast and periodically conducting with close (on-off), make this main inductance 103 cumlative energies, at any time to these main capacitance 105 makeup energy, then this main capacitance 105 can be kept a fixed voltage, is not subjected to the influence of load variations.
Yet, when this voltage-boosting converter (Boost Converter) switches at this main switch 101, the reverse recovery current of this main diode 104 (reverse recovery current), make this main switch 101 and this main diode 104 produce serious switch cost, so that can't improve the size that switching frequency reduces the inductor of this kind voltage-boosting converter.See also Fig. 2, Fig. 2 another located by prior art for proposing at above-mentioned shortcoming, this pulse-width modulation voltage-boosting converter 200 is to add a branch road in addition on a tie point of a main diode 204 and a main switch 201 basically, and this branch road has the reverse answer electric current that an auxiliary induction 206 and an auxiliary switch 207 can be eliminated this main diode 204.When these auxiliary switch 207 conductings, with the electrical power storage of a main power source Vs in this auxiliary induction 206, and the electric energy that impels an electric capacity 208 in parallel of this main switch 201 discharges fully and is stored in this auxiliary induction 206, and makes this main switch 201 can conducting when no-voltage (turn on).Yet when this auxiliary switch 207 cut out, the electric energy of this auxiliary induction 206 was again via 205 discharges of 209 pairs one electric capacity of a diode.Therefore can solve the switch cost of this main switch 101 and this main diode 104 among Fig. 1, but switch costs (during off) of this auxiliary switch 207 itself exist still, and can produce the generation of electromagnetic interference (EMI) and radio frequency interference problems such as (RFI).Wherein, this pulse-width modulation voltage-boosting converter 200 also comprises a full-wave rectifier 202, utilize this full-wave rectifier 202 with an AC wave rectification and a direct current voltage, as a main power source of this pulse-width modulation voltage-boosting converter 200, make this main power source can be on a main inductance 203 cumlative energy.
(3) summary of the invention
Main purpose of the present invention is to provide a kind of initiatively flexible switching DC-DC converter of energy discharging slot that has, utilize a resonance circuit to make the main switch of this DC-to-DC converter can conducting when an approximate zero voltage, and utilize an active energy discharging slot circuit that one single-way switch of this resonant circuit can cut out when an approximate zero electric current, to reduce the switch cost of this DC-to-DC converter.
According to first conception of the present invention, this DC-to-DC converter comprises: a voltage up converting circuit, comprise a main switch, and this voltage up converting circuit is electrically connected one first direct voltage, the switched conductive of utilizing this main switch with close, produce one second direct voltage and this first direct voltage boosted; One resonance circuit, this resonant circuit comprise one first coil of a single-way switch, resonance electric capacity and a transformer, and this resonant circuit makes this main switch of this voltage up converting circuit can conducting when an approximate zero voltage; And an energy discharging slot circuit initiatively, it has magnetic flux with this first coil of this transformer and is connected, and the inductance energy of this transformer of this resonant circuit is released to be similar to zeroly, and this single-way switch of this resonant circuit can cut out when an approximate zero electric current.
According to above-mentioned conception, wherein this voltage up converting circuit also comprises a main inductance, a main diode and a main capacitance, and when this main switch conducting, this first direct voltage is to this main inductance charging, and at this moment, this main diode ends; When this main switch ends, at this moment, this main diode current flow, the voltage of this first direct voltage and this main inductance produces this second direct voltage to this main capacitance charging.
According to above-mentioned conception, wherein this main inductance is to be electrically connected on a first node with one first conducting end of this main switch and the positive terminal of this main diode, and the other end of this main inductance is electrically connected this first direct voltage.
According to above-mentioned conception, wherein the positive terminal of a negative pole end of this main diode and this main capacitance is electrically connected on a Section Point, and this Section Point is an output of this second direct voltage.
According to above-mentioned conception, wherein the negative pole end of one second conducting end of this main switch and this main capacitance is electrically connected on one the 3rd node.
According to above-mentioned conception, wherein this active energy discharging slot circuit is a push-pull type DC-to-DC converter, it comprises: one first switch, has one first conducting end, its be connected in series end of one second coil of this transformer, the other end of this of this transformer second coil is electrically connected this Section Point, and one second conducting end is electrically connected the 3rd node; One second switch has one first conducting end, its be connected in series end of a tertiary coil of this transformer, and the other end of this tertiary coil of this transformer is electrically connected this Section Point, and one second conducting end is electrically connected the 3rd node; And a rectification circuit, it comprises: a second siding ring of this transformer has one first end, one second end and a centre tap; One first diode, one positive electrical connect this first end of this second siding ring; One second diode, one positive electrical connect this second end of this second siding ring, and its negative electricity connects this negative pole of this first diode; And one first electric capacity, its anode is electrically connected the common negative pole end of this first diode and this second diode, and its negative terminal is electrically connected this centre tap of this second siding ring.
According to above-mentioned conception, wherein this resonant circuit also comprises one the 3rd diode.
According to above-mentioned conception, wherein a negative pole of the 3rd diode is the end of this first coil of this transformer of being connected in series, and the other end of this of this transformer first coil is one first conducting end of this single-way switch of being connected in series, and one second conducting end of the positive pole of the 3rd diode and this single-way switch be connected in parallel this main switch and this resonant capacitor.
According to above-mentioned conception, wherein this transformer is one to have the transformer of leakage inductance.
According to above-mentioned conception, wherein this resonant circuit also comprises a resonance inductance, and it is connected in series between this first coil and the 3rd diode.
According to above-mentioned conception, wherein this active energy discharging slot circuit is a push-pull type DC-to-DC converter.
According to above-mentioned conception, wherein this active energy discharging slot circuit is a full-bridge type DC-to-DC converter.
According to second conception of the present invention, this DC-to-DC converter comprises: a voltage up converting circuit, it comprises a main switch, this voltage up converting circuit is electrically connected one first direct voltage, the switched conductive of utilizing this main switch with close, produce one second direct voltage and this first direct voltage boosted; One resonance circuit, this resonant circuit comprise one first coil of a single-way switch, a resonance electric capacity, resonance inductance and a transformer, and this resonant circuit is to make this main switch of this voltage up converting circuit can conducting when an approximate zero voltage; And an energy discharging slot circuit initiatively, be to have magnetic flux with this first coil of this transformer to be connected, the inductance energy of this transformer of this resonant circuit is released to be similar to zeroly, and this single-way switch of this resonant circuit can cut out when an approximate zero electric current.
For further specifying purpose of the present invention, design feature and effect, the present invention is described in detail below with reference to accompanying drawing.
(4) description of drawings
Fig. 1 is known pulse-width modulation (PWM) voltage-boosting converter (Boost Converter);
Fig. 2 is known Improvement type pulse-width modulation (PWM) voltage-boosting converter (Boost Converter);
Fig. 3 is the initiatively circuit diagram of the flexible switching DC-DC converter of energy discharging slot that has of the present invention's first preferred embodiment;
Fig. 4 a ~ 4h is the initiatively circuit operation schematic diagram of the flexible switching DC-DC converter of energy discharging slot that has of the present invention's first preferred embodiment; And
Fig. 5 is the initiatively circuit diagram of the flexible switching DC-DC converter of energy discharging slot that has of the present invention's second preferred embodiment.
(5) embodiment
See also Fig. 3, it is the initiatively circuit diagram of the flexible switching DC-DC converter of energy discharging slot that has of the present invention's first preferred embodiment.As shown in Figure 3, a kind of DC-to-DC converter 300 comprises: a voltage up converting circuit, a resonance circuit 306, an active energy discharging slot circuit 307.This voltage up converting circuit is electrically connected one first direct voltage V1, the switched conductive of utilizing a main switch 301 with close, produce one second direct voltage V2 and this first direct voltage V1 boosted.Wherein, this first direct voltage V1 is through a full-wave rectifier 302 and an electric capacity rectifying and wave-filtering and get by an alternating current, for the present invention, this first direct voltage V1 can be a direct voltage with voltage ripple, or the direct voltage of a level and smooth no-voltage ripple.
And this voltage up converting circuit also comprises a main inductance 303, one a main diode 304 and a main capacitance 305, and when these main switch 301 conductings, this first direct voltage V1 is to these main inductance 303 chargings, and at this moment, this main diode 304 ends; When this main switch 301 ends, at this moment, these main diode 304 conductings, the voltage of this first direct voltage V1 and this main inductance 303 is to these main capacitance 305 chargings, produces this second direct voltage V2.
Wherein, this main inductance 303 is to be electrically connected on a first node N1 with one first conducting end of this main switch 301 and a positive terminal of this main diode 304, and the other end of this main inductance 303 is electrically connected this first direct voltage V1.One negative pole end of this main diode 304 and the positive terminal of this main capacitance 305 are electrically connected on a Section Point N2, and this Section Point N2 is the output of this second direct voltage V2.One second conducting end of this main switch 301 and a negative pole end of this main capacitance 305 are electrically connected on one the 3rd node N3.
In addition, this resonant circuit 306 comprises one first coil 3063 and one the 3rd diode 3065 of a single-way switch 3061, a resonance electric capacity 3062, a transformer Tra.This resonant circuit 306 is to make this main switch 301 of this voltage up converting circuit can conducting when an approximate zero voltage.Wherein, one negative pole of the 3rd diode 3065 is the ends of this first coil 3063 of this transformer Tra of being connected in series, and the other end of this first coil 3063 of this transformer Tra is one first conducting end of this single-way switch 3061 of being connected in series, and one second conducting end of the positive pole of the 3rd diode 3065 and this single-way switch 3061 be connected in parallel this main switch 301 and this resonant capacitor 3062.This resonant circuit 306 also comprises a resonance inductance 3064, and it is connected in series between this first coil 3063 and the 3rd diode 3065.Yet this transformer Tra can be a transformer with leakage inductance, need not to use this resonance inductor.And this transformer Tra can be a single transformer, also can be two different transformers and connects to form.This single-way switch 3061 can be multi-form combination, as an IGBT or a MOSFET is connected in series modes such as a diode.
Yet this is energy discharging slot circuit 307 initiatively, can be a push-pull type DC-to-DC converter, can be used as a main power source or an accessory power supply.This active energy discharging slot circuit 307 makes the main switch of this voltage-boosting converter have magnetic flux with this first coil 3063 of this transformer Tra to be connected, the inductance energy of this transformer of this resonant circuit 306 released is similar to zero, and this single-way switch 3061 of this resonant circuit 306 can cut out when an approximate zero electric current.
Wherein, this active energy discharging slot circuit 307 comprises one first switch 3071, a second switch 3072 and a diode rectifier circuit.This first switch, has one first conducting end, its be connected in series end of one second coil 3073 of this transformer, the other end of this of this transformer second coil 3073 is to be electrically connected this Section Point N2, and one second conducting end is to be electrically connected the 3rd node N3.This second switch 3072, has one first conducting end, its be connected in series end of a tertiary coil 3074 of this transformer, the other end of this tertiary coil 3074 of this transformer is to be electrically connected this Section Point N2, and one second conducting end is to be electrically connected the 3rd node N3.And this diode rectifier circuit comprises a second siding ring 3075, one first diode 3076, one second diode 3077 and one first electric capacity 3078 of this transformer Tra.This second siding ring 3075 of this transformer Tra has one first end, one second end and a centre tap.This first diode 3076, one positive pole are this first ends that is electrically connected this second siding ring 3075.This second diode 3077, its positive pole are this second ends that is electrically connected this second siding ring 3075, and its negative pole is this negative pole that is electrically connected this first diode 3077.And this first electric capacity 3078, one anode are the common negative pole ends that is electrically connected this first diode 3076 and this second diode 3077, and the one negative terminal is this centre tap that is electrically connected this second siding ring 3075.
Seeing also Fig. 4 a ~ 4h is the initiatively circuit operation schematic diagram of the flexible switching DC-DC converter of energy discharging slot that has of the present invention's first preferred embodiment.Its groundwork principle is described below:
Shown in Fig. 4 a; pattern 0 (Mode 0); it is identical that this pattern and conventional P WM voltage-boosting converter operate in discharge mode (discharge mode); be stored in these main inductance 303 energy of this boost type change-over circuit; can be via this main diode 304; be discharged on this main capacitance 305; initiatively the circuit of energy discharging slot circuit 307 is then because the conducting of this second switch 3072; and via this transformer Tra with electrical energy transfer to this first electric capacity 3078, the output on as shown in the figure this first electric capacity 3078 can be in order to provide monitoring, protection and fan required power supply.
Shown in Fig. 4 b, pattern one (Mode 1), when this second switch 3072 ends (turn off), then the excitatory energy of this transformer Tra will impel main diode (bodydiode) conducting of this first switch 3071 and make this excitatory energy be discharged to this first electric capacity 3078 via this transformer Tra, again these first switch, 3071 conductings (turn on) promptly can be obtained this first switch, 3071 no-voltage conductings after the body of this first switch 3071 diode conducting.(magnetizing inductance at this hypothesis auxiliary transformer is very big, and first switch 3071, and the equivalent output capacitance on the second switch 3072 can be ignored)
Shown in Fig. 4 c, pattern two (Mode 2), make these single-way switch 3061 conductings in zero current (ZCS), the electric current of this resonance inductor 3064 then increases in the mode of linearity, when the electric current of this resonance inductor 3064 increases to the electric current that makes this main diode 304 when being 0, then this main diode 304 ends, and for zero current ends, this pattern finished this moment.
Shown in Fig. 4 d, pattern three (Mode 3), after main diode 304 begins to close, this resonant capacitor 3062 produces resonance through this transformer Tra and this resonance inductor 3064, and this resonance will make the energy of this resonant capacitor 3062 release to 0 and have energy partly to be discharged to this first electric capacity 3078 and this main capacitance 305 via this transformer Tra.When the voltage that this Mode ends in this resonant capacitor 3062 is discharged to 0V.
Shown in Fig. 4 e, pattern four (Mode 4), when these resonant capacitor 3062 voltages arrive no-voltage, drive this main switch 301 conductings, so this main switch 301 conducting when no-voltage, the energy of this resonance inductor 3064 is discharged to this first electric capacity 3078 and this main capacitance 305 linearly via this transformer Tra, finishes and release when these resonance inductor 3064 energy, that is is that this pattern is when finishing.Because this switch 3061 is a single-way switch, so when even the drive signal of this single-way switch 3061 still keeps a high voltage, this single-way switch 3061 can cut out naturally, and closes under the situation of zero current.
Shown in Fig. 4 f, pattern five (Mode 5), this Mode starts from this resonance inductor 3064 energy discharge to 0, and it is identical that this Mode operates in charge mode with conventional P WM pulse-width modulation formula boost converter.
Shown in Fig. 4 g, pattern six (Mode 6), this main switch 301 still is in conducting state, and this first switch 3071 cuts out, this second switch 3072 because of excitatory energy conducting in no-voltage, when this Mode ends at this main switch 301 and closes.
Shown in Fig. 4 h, pattern seven (Mode 7), when main switch 301 is closed, this main inductance 303 of this boost type change-over circuit charges to this resonant capacitor 3062, the voltage of this this resonant capacitor 3062 can linearly rise, when the voltage of this resonant capacitor 3062 equaled this second direct voltage V2, this pattern promptly finished.
In addition, this first switch 3071 and this second switch 3072 are respectively with 50% buty cycle (dutycycle) conducting.
See also Fig. 5, Fig. 5 is the initiatively circuit diagram of the flexible switching DC-DC converter of energy discharging slot that has of the present invention's second preferred embodiment.Wherein Zui Da difference is that this active energy discharging slot circuit is to be a full-bridge type DC-to-DC converter.
Comprehensively above-mentioned, the present invention can provide a kind of flexible switching DC-DC converter with active energy discharging slot to reduce the switch cost of this DC-to-DC converter, is therefore solved the mistake of known techniques, and then reaches research and development purpose of the present invention.
Certainly, those of ordinary skill in the art will be appreciated that, above embodiment is used for illustrating the present invention, and be not to be used as limitation of the invention, as long as in connotation scope of the present invention, all will drop in the scope of claims of the present invention variation, the modification of the above embodiment.
Claims (13)
1. a DC-to-DC converter is characterized in that, comprising:
One voltage up converting circuit, it comprises a main switch, this voltage up converting circuit is electrically connected one first direct voltage, the switched conductive of utilizing this main switch with close, produce one second direct voltage and this first direct voltage boosted;
One resonance circuit, it comprises one first coil of a single-way switch, resonance electric capacity and a transformer, this resonant circuit is to make this main switch of this voltage up converting circuit can conducting when an approximate zero voltage; And
One energy discharging slot circuit initiatively, it is connected with this first coil flux of this transformer, and the inductance energy of this transformer of this resonant circuit is released to be similar to zeroly, and this single-way switch of this resonant circuit can cut out when an approximate zero electric current.
2. DC-to-DC converter as claimed in claim 1 is characterized in that, this voltage up converting circuit also comprises a main inductance, a main diode and a main capacitance, when this main switch conducting, this first direct voltage is to this main inductance charging, and at this moment, this main diode ends; When this main switch ends, at this moment, this main diode current flow, the voltage of this first direct voltage and this main inductance is to this main capacitance charging, to produce this second direct voltage.
3. DC-to-DC converter as claimed in claim 2, it is characterized in that, this main inductance is to be electrically connected on a first node with one first conducting end of this main switch and an anode tap of this main diode, and the other end of this main inductance is to be electrically connected this first direct voltage.
4. DC-to-DC converter as claimed in claim 3 is characterized in that, a negative pole end of this main diode and the positive terminal of this main capacitance are electrically connected on a Section Point, and this Section Point is the output for this second direct voltage.
5. DC-to-DC converter as claimed in claim 4 is characterized in that, one second conducting end of this main switch and a negative pole end of this main capacitance are electrically connected on one the 3rd node.
6. DC-to-DC converter as claimed in claim 5 is characterized in that, this active energy discharging slot circuit is a push-pull type DC-to-DC converter, and it comprises:
One first switch has one first conducting end, its be connected in series end of one second coil of this transformer, and the other end of this of this transformer second coil is electrically connected this Section Point, and one second conducting end is electrically connected the 3rd node;
One second switch has one first conducting end, its be connected in series end of a tertiary coil of this transformer, and the other end of this tertiary coil of this transformer is electrically connected this Section Point, and one second conducting end is to be electrically connected the 3rd node; And
One rectification circuit, it comprises:
One second siding ring of this transformer has one first end, one second end and a centre tap;
One first diode, its positive electrical connect this first end of this second siding ring;
One second diode, its positive electrical connect this second end of this second siding ring, and the one negative electricity connects this negative pole of this first diode; And
One first electric capacity, one anode are electrically connected the common negative pole end of this first diode and this second diode, and the one negative terminal is electrically connected this centre tap of this second siding ring.
7. DC-to-DC converter as claimed in claim 1 is characterized in that, this resonant circuit also comprises one the 3rd diode.
8. DC-to-DC converter as claimed in claim 7, it is characterized in that, the negative pole of the 3rd diode is the end of this first coil of this transformer of being connected in series, and be connected in series one first conducting end of this single-way switch of the other end of this of this transformer first coil, and one second conducting end of the positive pole of the 3rd diode and this single-way switch be connected in parallel this main switch and this resonant capacitor.
9. DC-to-DC converter as claimed in claim 8 is characterized in that, this transformer is one to have the transformer of leakage inductance.
10. DC-to-DC converter as claimed in claim 8 is characterized in that, this resonant circuit also comprises a resonance inductance, and it is connected in series between this first coil and the 3rd diode.
11. DC-to-DC converter as claimed in claim 1 is characterized in that, this active energy discharging slot circuit is a push-pull type DC-to-DC converter.
12. DC-to-DC converter as claimed in claim 1 is characterized in that, this active energy discharging slot circuit is a full-bridge type DC-to-DC converter.
13. a DC-to-DC converter is characterized in that, comprising:
One voltage up converting circuit, it comprises a main switch, this voltage up converting circuit is to be electrically connected one first direct voltage, the switched conductive of utilizing this main switch with close, produce one second direct voltage and this first direct voltage boosted;
One resonance circuit, it comprises one first coil of a single-way switch, a resonance electric capacity, resonance inductance and a transformer, this resonant circuit makes this main switch of this voltage up converting circuit can conducting when an approximate zero voltage; And
One energy discharging slot circuit initiatively, it has magnetic flux with this first coil of this transformer and is connected, and the inductance energy of this transformer of this resonant circuit is released to be similar to zeroly, and this single-way switch of this resonant circuit can cut out when an approximate zero electric current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02124612 CN1238956C (en) | 2002-06-13 | 2002-06-13 | Flexible switching DC-DC converter with active energy discharging slot |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02124612 CN1238956C (en) | 2002-06-13 | 2002-06-13 | Flexible switching DC-DC converter with active energy discharging slot |
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| CN1469537A true CN1469537A (en) | 2004-01-21 |
| CN1238956C CN1238956C (en) | 2006-01-25 |
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| CN 02124612 Expired - Fee Related CN1238956C (en) | 2002-06-13 | 2002-06-13 | Flexible switching DC-DC converter with active energy discharging slot |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101060290B (en) * | 2006-04-21 | 2011-04-27 | 台达电子工业股份有限公司 | Current source inverter with energy clamping circuit and its control method |
| CN103812222A (en) * | 2012-11-13 | 2014-05-21 | 徐夫子 | Conversion device for improving generating efficiency |
| CN107733101A (en) * | 2017-12-01 | 2018-02-23 | 华北电力大学（保定） | Wide area intelligence mutual inductance power taking control system |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103330831B (en) * | 2013-05-28 | 2015-03-25 | 陈松 | Traditional Chinese medicine for treating purple plague |
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2002
- 2002-06-13 CN CN 02124612 patent/CN1238956C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101060290B (en) * | 2006-04-21 | 2011-04-27 | 台达电子工业股份有限公司 | Current source inverter with energy clamping circuit and its control method |
| CN103812222A (en) * | 2012-11-13 | 2014-05-21 | 徐夫子 | Conversion device for improving generating efficiency |
| CN107733101A (en) * | 2017-12-01 | 2018-02-23 | 华北电力大学（保定） | Wide area intelligence mutual inductance power taking control system |
| CN107733101B (en) * | 2017-12-01 | 2024-03-26 | 华北电力大学（保定） | Wide-area intelligent mutual inductance power-taking control system |
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| CN1238956C (en) | 2006-01-25 |
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Assignee: In reach electronics (Jiangsu) Co., Ltd Assignor: Delta Optoelectronics Inc. Contract fulfillment period: 2008.1.1 to 2013.12.31 contract change Contract record no.: 2009990000379 Denomination of invention: Flexible switching DC-DC converter with active energy discharging slot Granted publication date: 20060125 License type: Exclusive license Record date: 2009.4.28 |
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Free format text: EXCLUSIVE LICENSE; TIME LIMIT OF IMPLEMENTING CONTACT: 2008.1.1 TO 2013.12.31; CHANGE OF CONTRACT Name of requester: ZHONGDA ELECTRONICS (JIANGSU) CO., LTD. Effective date: 20090428 |
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Granted publication date: 20060125 Termination date: 20170613 |