Small form factor power supply

• US 20080151581A1
• Filed: 02/29/2008
• Published: 06/26/2008
• Est. Priority Date: 04/26/1994
• Status: Active Grant

• Current Assignee: Comarco Wireless Technologies Incorporated (Comarco Incorporated)
• Original Assignee: Comarco Wireless Technologies Incorporated (Comarco Incorporated)
• Inventors: Lanni, Thomas W.
• Granted Patent: US 7,613,021 B2
• Time in Patent Office: Days
• US Class Current: 363/21.01
• CPC Class Codes: G06F 1/26 Power supply means, e.g. regulation thereof for memories G11C
• CPC Class Codes: H01F 2027/2819 Planar transformers with printed windings, e.g. surrounded by two cores and to be mounted on printed circuit
• CPC Class Codes: H01R 13/24 resilient; resiliently-mounted
• CPC Class Codes: H01R 13/6675 with built-in power supply
• CPC Class Codes: H01R 2201/16 for telephony
• CPC Class Codes: H01R 2201/24 for radio transmission
• CPC Class Codes: H02J 2207/20 Charging or discharging characterised by the power electronics converter
• CPC Class Codes: H02J 7/00041 in response to measured battery parameters, e.g. voltage, current or temperature profile
• CPC Class Codes: H02J 7/00047 with provisions for charging different types of batteries
• CPC Class Codes: H02J 7/0068 Battery or charger load switching, e.g. concurrent charging and load supply H02J7/0013 takes precedence
• CPC Class Codes: H02J 7/02 for charging batteries from ac mains by converters
• CPC Class Codes: H02M 1/4258 using a single converter stage both for correction of AC input power factor and generation of a regulated and galvanically isolated DC output voltage H02M1/4241 takes precedence
• CPC Class Codes: H02M 3/003 Constructional details, e.g. physical layout, assembly, wiring or busbar connections
• CPC Class Codes: H02M 3/156 with automatic control of output voltage or current, e.g. switching regulators
• CPC Class Codes: H02M 3/28 using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
• CPC Class Codes: H02M 3/33507 with automatic control of the output voltage or current, e.g. flyback converters H02M3/33561, H02M3/33569 take precedence
• CPC Class Codes: H02M 3/33523 with galvanic isolation between input and output of both the power stage and the feedback loop
• CPC Class Codes: H02M 3/3372 of the parallel type
• CPC Class Codes: H02M 3/3378 in a push-pull configuration of the parallel type H02M3/3374 takes precedence
• CPC Class Codes: H02M 3/3382 in a push-pull circuit arrangement
• CPC Class Codes: H02M 3/3387 : in a push-pull configuration
• CPC Class Codes: H02M 7/003 : Constructional details, e.g. physical layout, assembly, wiring or busbar connections
• CPC Class Codes: H05K 1/0203 : Cooling of mounted components H05K1/0272 takes precedence
• CPC Class Codes: H05K 1/0262 : Arrangements for regulating voltages or for using plural voltages
• CPC Class Codes: H05K 1/029 : having a programmable lay-out, i.e. adapted for choosing between a few possibilities
• CPC Class Codes: H05K 1/16 : incorporating printed electric components, e.g. printed resistor, capacitor, inductor
• CPC Class Codes: H05K 1/165 : incorporating printed inductors
• CPC Class Codes: H05K 2201/086 : for inductive purposes, e.g. printed inductor with ferrite core
• CPC Class Codes: H05K 2201/09063 : Holes or slots in insulating substrate not used for electrical connections
• CPC Class Codes: Y02B 40/00 : Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers
• CPC Class Codes: Y02B 70/10 : Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

Abstract

A small form factor power supply includes a switching transformer, control circuitry and rectifier circuitry, each contained within a housing. The switching transformer has a planar core and windings which surround at least a portion of the planar core. The control circuitry includes at least one surface mounted component, to control a switching device to couple a source of DC power to a primary of the switching transformer at a switching frequency. The rectifier circuitry is coupled to a secondary of the switching transformer to provide a DC voltage. The housing contains the switching transformer, the control circuitry and the rectifier circuitry, wherein a height of the housing is not greater than 0.75 inches.

Claims

1. A small form factor power supply comprising:

a switching transformer having a planar core and windings which surround at least a portion of the planar core;

control circuitry, including at least one surface mounted component, to control a switching device to couple a source of DC power to a primary of the switching transformer at a switching frequency;

rectifier circuitry coupled to a secondary of the switching transformer to provide a DC voltage; and

a housing containing the switching transformer, the control circuitry and the rectifier circuitry, wherein a height of the housing is not greater than 0.75 inches.

2. The small form factor power supply of claim 1, wherein the planar core is an “

E”

type core.

3. The small form factor power supply of claim 1, wherein the rectifier circuitry includes at least one surface mounted component.

4. The small form factor power supply of claim 1 further including a circuit board having a cutout through which the planar core extends.

5. The small form factor power supply of claim 4, wherein the windings are formed by wiring traces on the printed circuit board.

6. The small form factor power supply of claim 5, wherein the at least one surface mounted component is mounted to the printed circuit board.

7. A small form factor power supply comprising:

a switching transformer having a low profile core and windings which surround at least a portion of the low profile core;

control circuitry, including at least one surface mounted component, to control a switching device to couple a source of DC power to a primary of the switching transformer at a switching frequency;

rectifier circuitry coupled to a secondary of the switching transformer to provide a DC voltage; and

a housing containing the switching transformer, the control circuitry and the rectifier circuitry, wherein a height of the housing is not greater than about 0.75 inches.

8. The small form factor power supply of claim 7, wherein the low profile core is an “

E”

type core.

9. The small form factor power supply of claim 7, wherein the rectifier circuitry includes at least one surface mounted component.

10. The small form factor power supply of claim 7 further including a circuit board having a cutout through which the low profile core extends.

11. The small form factor power supply of claim 10, wherein the windings are formed by wiring traces on the printed circuit board.

12. The small form factor power supply of claim 11, wherein the at least one surface mounted component is mounted to the printed circuit board.

13. A small form factor power supply comprising:

a switching transformer having a planar core and windings which surround at least a portion of the planar core;

control circuitry, including at least one surface mounted component, to control a switching device to couple a source of DC power to a primary of the switching transformer at a switching frequency;

rectifier circuitry coupled to a secondary of the switching transformer to provide a DC voltage; and

a housing containing the switching transformer, the control circuitry and the rectifier circuitry, wherein a height of the housing is not greater than about 0.75 inches and a volume of the housing is not greater than 9.3 cubic inches.

14. The small form factor power supply of claim 13, wherein the planar core is an “

E”

type core.

15. The small form factor power supply of claim 13, wherein the rectifier circuitry includes at least one surface mounted component.

16. The small form factor power supply of claim 13 further including a circuit board having a cutout through which the planar core extends.

17. The small form factor power supply of claim 16, wherein the windings are formed by wiring traces on the printed circuit board.

18. The small form factor power supply of claim 17, wherein the at least one surface mounted component is mounted to the printed circuit board.

19. A small form factor power supply comprising:

a switching transformer having a low profile core and windings which surround at least a portion of the low profile core;

control circuitry, including at least one surface mounted component, to control a switching device to couple a source of DC power to a primary of the switching transformer at a switching frequency;

rectifier circuitry coupled to a secondary of the switching transformer to provide a DC voltage; and

a housing containing the switching transformer, the control circuitry and the rectifier circuitry, wherein a height of the housing is not greater than 0.75 inches and a volume of the housing is not greater than 9.3 cubic inches.

20. The small form factor power supply of claim 19, wherein the low profile core is an “

E”

type core.

21. The small form factor power supply of claim 19, wherein the rectifier circuitry includes at least one surface mounted component.

22. The small form factor power supply of claim 19 further including a circuit board having a cutout through which the low profile core extends.

23. The small form factor power supply of claim 22, wherein the windings are formed by wiring traces on the printed circuit board.

24. The small form factor power supply of claim 23, wherein the at least one surface mounted component is mounted to the printed circuit board.