WO1998050993B1 - Inductive power transfer across an extended gap - Google Patents
Inductive power transfer across an extended gapInfo
- Publication number
- WO1998050993B1 WO1998050993B1 PCT/NZ1998/000053 NZ9800053W WO9850993B1 WO 1998050993 B1 WO1998050993 B1 WO 1998050993B1 NZ 9800053 W NZ9800053 W NZ 9800053W WO 9850993 B1 WO9850993 B1 WO 9850993B1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- power supply
- power
- inductive
- capacitive load
- inductor
- Prior art date
Links
- 230000001939 inductive effect Effects 0.000 title claims abstract 9
- 239000004020 conductor Substances 0.000 claims abstract 4
- 235000013361 beverage Nutrition 0.000 claims 4
- 230000003321 amplification Effects 0.000 claims 1
- 230000000295 complement Effects 0.000 claims 1
- 238000003199 nucleic acid amplification method Methods 0.000 claims 1
- 238000004804 winding Methods 0.000 claims 1
- 239000003990 capacitor Substances 0.000 abstract 1
- 230000001808 coupling Effects 0.000 abstract 1
- 238000010168 coupling process Methods 0.000 abstract 1
- 238000005859 coupling reaction Methods 0.000 abstract 1
Abstract
Inductive power transfer across an extended gap (100) from a primary conductor (119) is provided by means of a resonant intermediate loop comprised of capacitor (118) with inductor (117) - perhaps simply a non-coiled wire - carrying a larger resonating current, that can in turn generate an inductive field to be collected by a pickup coil (120). This loop may increase the transfer rate or reduce the alignment accuracy required of an IPT system, useful for vehicles as well as for lighting and display purposes, and also offers frequency-stabilising features. An electroluminescent advertising panel may be powered from a sine-wave oscillator at 1.2 kHz; its DC power at 50 volts collected by a controlled secondary pickup coil tuned to a system frequency of 15 kHz and placed near to an intermediate pickup coil; also resonant at the system frequency and which is driven by inductive coupling from a primary conductor fed with alternating current at the system frequency.
Claims
1. A power supply for a capacitive load, wherein the power supply is capable of generating a substantially sine-wave alternating current at an effective voltage and an effective frequency for use with said capacitive load, and said power supply includes a pair of switches capable of being driven in a complementary manner at the effective frequency from a source of power, and includes inductance means capable of resonance at or about the effective frequency when connected to the capacitive load.
2. A power supply as claimed in claim 1, wherein the switches each have a first terminal, a second terminal, and a control terminal respectively, and each switch has current amplification properties, and said inductance means includes a first inductor and a second resonating inductor, wherein said first inductor is in series between a source of power and a centre tap of the second resonating inductor, the start and finish of the winding of the second inductor being connected to the second terminals of each of the pair of switches, each first terminal of each switch being connected to the return line to the source of power, and each control terminal of each switch being connected via a resistor chain to the second terminal of the other switch, and wherein in use the capacitive load is connected between the second terminals of the two switches.
3. A power supply as claimed in claim 2, wherein the circuit can be functionally enabled or disabled by connecting an intermediate point in one or both resistor chains to a potential capable of reversibly interrupting oscillation, thereby halting the supply of sine wave power.
4. A power supply as claimed in any one of claims 1 to 3, wherein the power supply is connected to the capacitive load, and the capacitive load includes one or more electroluminescent panels connected in parallel with a frequency-adjusting capacitance.
5. A power supply as claimed in any one of claims 1 to 4, wherein the power supply is capable of being supplied with electric power from a conventional utility supply.
6. A power supply as claimed in any of claims 1 to 4, wherein the power supply includes a secondary resonant pick-up circuit capable of collecting inductive power from a primary conductor.
7. A power supply as claimed in claim 6, further including an intermediate resonant loop, resonant at a system-wide frequency and capable of being positioned within an inductive power transfer system so that inductive power is capable of being coupled inductively from the primary inductive conductor through the intermediate resonant loop to the secondary resonant pick-up circuit.
8. A beverage dispenser having one or more electroluminescent panels associated with valves capable of controlling the flow of a beverage, wherein the or each electroluminescent panel is capable of being provided with power from a power supply as claimed in any of claims 1 to 3.
9. A beverage dispenser as claimed in claim 8, wherein the power supply is as claimed in claim 7 so that in use the intermediate resonant loop enables power to be supplied to the electroluminescent panel even though the effective distance between the electroluminescent panel and the source of inductive power changes during operation of the beverage dispenser.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NZ500773A NZ500773A (en) | 1997-05-06 | 1998-05-04 | Resonant power supply for a capacitative electroluminescent panel |
| CA002288877A CA2288877A1 (en) | 1997-05-06 | 1998-05-04 | Inductive power transfer across an extended gap |
| EP98923226A EP1010229A4 (en) | 1997-05-06 | 1998-05-04 | Inductive power transfer across an extended gap |
| US09/423,364 US6317338B1 (en) | 1997-05-06 | 1998-05-04 | Power supply for an electroluminescent display |
| JP54794298A JP2002508916A (en) | 1997-05-06 | 1998-05-04 | Induction power transfer across the widening gap |
| AU75564/98A AU752159B2 (en) | 1997-05-06 | 1998-05-04 | Inductive power transfer across an extended gap |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NZ314754 | 1997-05-06 | ||
| NZ31475497 | 1997-05-06 |
Related Child Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US09/423,364 A-371-Of-International US6317338B1 (en) | 1997-05-06 | 1998-05-04 | Power supply for an electroluminescent display |
| US09/826,352 Division US20010012208A1 (en) | 1997-05-06 | 2001-04-05 | Inductive power distribution system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| WO1998050993A1 WO1998050993A1 (en) | 1998-11-12 |
| WO1998050993B1 true WO1998050993B1 (en) | 1999-01-07 |
Family
ID=19926237
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/NZ1998/000053 WO1998050993A1 (en) | 1997-05-06 | 1998-05-04 | Inductive power transfer across an extended gap |
Country Status (6)
| Country | Link |
|---|---|
| US (2) | US6317338B1 (en) |
| EP (1) | EP1010229A4 (en) |
| JP (1) | JP2002508916A (en) |
| AU (1) | AU752159B2 (en) |
| CA (1) | CA2288877A1 (en) |
| WO (1) | WO1998050993A1 (en) |
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- 1998-05-04 EP EP98923226A patent/EP1010229A4/en not_active Withdrawn
- 1998-05-04 WO PCT/NZ1998/000053 patent/WO1998050993A1/en not_active Application Discontinuation
- 1998-05-04 US US09/423,364 patent/US6317338B1/en not_active Expired - Fee Related
- 1998-05-04 AU AU75564/98A patent/AU752159B2/en not_active Ceased
- 1998-05-04 JP JP54794298A patent/JP2002508916A/en active Pending
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2001
- 2001-04-05 US US09/826,352 patent/US20010012208A1/en not_active Abandoned
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