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Multiple output power supply including one regulated converter and at least one semi-regulated converter

Imported: 23 Feb '17 | Published: 22 Oct '02

John C. Curtin

USPTO - Utility Patents

Abstract

A power supply, including a regulated switchmode converter, a PWM controller, a semi-regulated converter, and a linear regulator. The regulated switchmode converter is for converting an input voltage to a first output voltage. The PWM controller is responsive to the first output voltage, and includes an output terminal coupled to a control terminal of a switch of the regulated switchmode converter. The semi-regulated switchmode converter is for converting the input voltage to an intermediate output voltage, and includes a switch having a control terminal coupled to the output terminal of the PWM controller. The linear regulator is coupled to the semi-regulated switchmode converter and is for converting the intermediate output voltage to a second output voltage.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

For the present invention to be clearly understood and readily practiced, the present invention will be described in conjunction with the following figures, wherein:

FIG. 1 is a combination block/schematic diagram of a power supply according to one embodiment of the present invention;

FIG. 2 is a schematic diagram of a linear regulator of the power supply of FIG. 1 according to one embodiment of the present invention;

FIG. 3 is a schematic diagram of the second converter of the power supply of FIG. 1 according to one embodiment of the present invention;

FIG. 4 is a schematic diagram of the second converter of the power supply of FIG. 1 according to one embodiment of the present invention;

FIG. 5 is a schematic diagram of the third converter of the power supply of FIG. 1 according to one embodiment of the present invention;

FIG. 6 is a schematic diagram of the third converter of the power supply of FIG. 1 according to one embodiment of the present invention;

FIG. 7 is a schematic diagram of a power supply according to another embodiment of the present invention; and

FIG. 8 is a schematic diagram of the PWM controller of FIG. 1 according to one embodiment of the present invention.

Claims

1. A power supply, comprising:

2. The power supply of claim 1, further comprising a duty cycle clamp circuit coupled between the output terminal of the PWM controller and the control terminal of the switch of the first semi-regulated switchmode converter.

3. The power supply of claim 2, wherein:

4. The power supply of claim 2, further comprising:

5. The power supply of claim 4, wherein:

6. The power supply of claim 1, wherein the PWM controller includes a comparator having an inverting terminal responsive to a sum of the first output voltage and a time dependent voltage, a non-inverting terminal responsive to a reference voltage, and an output terminal coupled to the control terminal of the switch of the regulated switchmode converter.

7. A power supply, comprising:

8. The power supply of claim 7, wherein:

9. The power supply of claim 7, wherein the PWM controller includes a comparator having an inverting terminal responsive to a sum of the first output voltage and a time dependent voltage, a non-inverting terminal responsive to a reference voltage, and an output terminal coupled to the control terminal of the switch of the regulated switchmode converter.

10. A power supply, comprising:

11. The power supply of claim 10, wherein the first linear switch closed-loop switchmode converter includes an operational amplifier having an input terminal responsive to the second output voltage and an output terminal coupled to the control terminal of the switch of the first linear switch closed-loop switchmode converter.

12. The power supply of claim 10, wherein the first linear switch closed-loop switchmode converter includes:

13. The power supply of claim 10, further comprising a second linear switch closed-loop switchmode converter for converting the first output voltage to a second output voltage, wherein the second linear switch closed-loop switchmode converter includes a switch having a control terminal coupled to the output terminal of the PWM controller.

14. The power supply of claim 10, further comprising:

15. The power supply of claim 10, wherein the PWM controller includes a comparator having an inverting terminal responsive to a sum of the first output voltage and a time dependent voltage, a non-inverting terminal responsive to a reference voltage, and an output terminal coupled to the control terminal of the switch of the regulated switchmode converter.

16. A power supply, comprising:

17. The power supply of claim 16, wherein the first linear switch closed-loop switchmode converter includes an operational amplifier having an input terminal responsive to the second output voltage and an output terminal coupled to the control terminal of the switch of the first linear switch closed-loop switchmode converter.

18. The power supply of claim 16, wherein the first linear switch closed-loop switchmode converter includes:

19. The power supply of claim 16, further comprising:

20. The power supply of claim 16, wherein the PWM controller includes a comparator having an inverting terminal responsive to a sum of the first output voltage and a time dependent voltage, a non-inverting terminal responsive to a reference voltage, and an output terminal coupled to the control terminal of the switch of the regulated switchmode converter.

21. A method of converting an input voltage to multiple output voltages, comprising:

22. The method of claim 21, further comprising:

23. A method of converting an input voltage to multiple output voltages, comprising:

24. A method of converting an input voltage to multiple output voltages, comprising:

25. The method of claim 24, further comprising converting the first output voltage to a third output voltage with a second linear switch closed-loop switchmode converter.

26. The method of claim 24, further comprising:

27. A method of converting an input voltage to multiple output voltages, comprising:

28. The method of claim 27, further comprising: