Power transforming apparatus with multiple parallel-connected transformers

• US 20030227364A1
• Filed: 06/11/2002
• Published: 12/11/2003
• Est. Priority Date: 06/11/2002
• Status: Abandoned Application

• Current Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Original Assignee: Koninklijke Philips N.V.
• Inventors: Li, Qiong, Li, Yushan, Giannopoulos, Demetri
• Application Number:
  US10/167,183
• Publication Number:
  US 20030227364A1
• Time in Patent Office: Days
• US Class Current: 336/182
• CPC Class Codes: H01F 38/14 Inductive couplings for wireless supply or distribution of electric power using inductive coupling H02J50/10
• CPC Class Codes: H02J 50/10 using inductive coupling
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 7/00712 the cycle being controlled or terminated in response to electric parameters
• CPC Class Codes: H02M 3/28 using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac

Abstract

A power transforming apparatus comprises at least two transformers connected parallel to each other between a common power source and a common output, each of said transformers including a primary and a secondary for transforming power from said same power source to said same output. The resistive loss is substantially decreased because the current is split among multiple transformers, and therefore the temperature of the transformer is kept low as less heat is produced from the transformer loss.

Claims

1. A power transforming and charging apparatus comprising at least two transformers connected parallel to each other between a common power source and a common output, each of said transformers comprising a primary and a secondary for transforming power from said same power source to said same output said output being arranged to charge a portable device.

2. The apparatus of claim 1 wherein said secondaries of said at least two transformers are in phase with each other.

3. The apparatus of claim 2 wherein said secondaries are connected to said output through a bridge rectifier.

4. The apparatus of claim 1 wherein said secondaries of said at least two transformers are 180°

out of phase to each other.

5. The apparatus of claim 4 wherein each of said secondaries is connected to said output through a single rectifier diode.

6. The apparatus of claim 4 wherein in each of said transformers, said primary and said secondary is in phase.

7. The apparatus of claim 4 wherein in each of said transformers, said primary and said secondary is 180°

out of phase.

8. The apparatus of claim 1 wherein said primaries are connected to said power source through an LC resonant converter.

9. The apparatus of claim 1 wherein said primaries are connected to said power source through an LLC resonant converter.

10. The apparatus of claim 1 wherein each of said transformers is a coreless transformer.

11. The apparatus of claim 1 wherein each of said transformers is a coreless PCB spiral transformer.

12. The apparatus of claim 1 wherein said transformers are identical to each other.

13. A battery charger comprising a power transforming circuitry for transforming power from a power source to A battery, wherein said power transforming circuitry comprises at least two transformers connected parallel to each other between said same power source and said same battery, each comprising a primary and a secondary for transforming power from said power source to said battery.

14. The battery charger of claim 13 wherein each of said transformers is a coreless PCB spiral transformer.

15. The battery charger of claim 13 wherein said transformers are identical to each other.

16. The battery charger of claim 13 wherein said secondaries in said at least two transformers are in phase to each other, and are connected to said battery through a bridge rectifier.

17. The battery charger of claim 13 wherein said secondaries in said at least two transformers are 180°

out of phase to each other, each being connected to said battery through a single rectifier diode.

18. An electronic device comprising a battery charger for charging a battery internally accommodated in said electronic device, wherein said battery charger comprises a power transforming circuitry having at least two transformers connected parallel to each other between a common power source and said same battery, each transformer comprising a primary and a secondary for transforming power from said same power source to said battery.

19. The electronic device of claim 18 wherein said primary is located external to said electronic device, while said secondary is located internal to said electronic device.

20. The electronic device of claim 18 wherein said transformers are coreless PCB spiral transformers.