Bi-directional regulator for regulating power

• US 8,223,522 B2
• Filed: 09/25/2007
• Issued: 07/17/2012
• Est. Priority Date: 09/25/2006
• Status: Active Grant

• Current Assignee: Flextronics America LLC (Flextronics International Limited)
• Original Assignee: Flextronics America LLC (Flextronics International Limited)
• Inventors: Telfus, Mark D.
• Primary Examiner(s): Sterrett, Jeffrey
• Assistant Examiner(s): Quddus, Nusrat
• Application Number:
  US11/904,180
• Publication Number:
  US 20080074095A1
• Time in Patent Office: 1,757 Days
• Field of Search: 363/15, 363/63, 363/65, 363/74, 363/78, 363/79, 363/80, 363/125, 363/89, 323/266
• US Class Current: 363/125
• CPC Class Codes: H02M 1/007 Plural converter units in cascade push-pull DC/DC converters with pre-regulator H02M3/3374; DC-AC converters following a DC-DC stage including a high frequency transformer H02M7/4807; DC-AC converters following a DC-DC conversion stage generating periodically varying voltages H02M7/4826
• CPC Class Codes: H02M 1/10 Arrangements incorporating converting means for enabling loads to be operated at will from different kinds of power supplies, e.g. from ac or dc
• CPC Class Codes: H02M 3/1588 comprising at least one synchronous rectifier element H02M3/1582, H02M3/1584 take precedence
• CPC Class Codes: H02M 3/33515 with digital control
• 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 regulated power supply apparatus is provided. The apparatus includes an input power converting circuit for generating a rectified voltage signal, an output power converting circuit comprising a plurality of switching elements, the output power converting circuit coupled to receive the rectified voltage signal, an output power storing element coupled with the output power converting circuit, and an output power bidirectional regulating circuit comprising an integrated circuit coupled with the output power converting circuit, the bidirectional regulating circuit including control signals for operating the switching elements to store power on the output power storing element and to deliver power to an output load from the output power storing element. An integrated circuit controlled regulator circuit is provided for controlling a plurality of switches a boost and buck converter. A method of regulating power supply is also provided.

Claims

1. A regulated power supply apparatus comprising:

an input power converting circuit for generating a rectified voltage signal;

an output power converting circuit comprising a plurality of switching elements, the output power converting circuit coupled to receive the rectified voltage signal;

an output power storing element coupled with the output power converting circuit; and

an output power bidirectional regulating circuit comprising an integrated circuit coupled with the output power converting circuit, the bidirectional regulating circuit including control signals for operating the switching elements to store power on the output power storing element when a voltage applied to the load exceeds a threshold; and

to supply a compensating power to an output load from the power storing element when the voltage applied to the load is less then the threshold, wherein the bidirectional regulating circuit is configured to;

compare a reference voltage with the applied voltage;

configure the plurality of switching elements as a boost converter when the applied voltage is greater than the reference voltage, wherein the applied voltage is reduced by transferring excess power from the applied voltage to the output power storing element; and

configure the plurality of switching elements as a buck converter when the applied voltage is less than the reference voltage, wherein the applied voltage is increased by transferring excess power from the output power storing element to the applied voltage.

2. The apparatus of claim 1, wherein a first switching element and a second switching element are configured such that the first switching element functions as a transistor and the second switching element functions as a diode, wherein the functions of the first and second switching element are alternately switched with each other by the bidirectional regulating circuit.

3. The apparatus of claim 1, further comprising a reference input on the bidirectional regulating circuit for generating a reference voltage for the output load.

4. The apparatus of claim 1, further comprising a sensing input on the bidirectional regulating circuit for measuring a voltage of the output load.

5. The apparatus of claim 1, wherein the output power storing element comprises a capacitor element.

6. The apparatus of claim 1, wherein the switching elements each comprise a semiconductor device.

7. The apparatus of claim 1, wherein the output power converting circuit includes an inductive element coupled with the switching elements.

8. The apparatus of claim 1, wherein the input power converting circuit is configured to convert an alternating current to a direct current.

9. The apparatus of claim 1, wherein a first switching element is an open circuit and a second switching element is a closed circuit such that excess power is stored in the output power storage element when the voltage applied to the load exceeds a threshold.

10. The apparatus of claim 1, wherein a first switching element is a closed circuit and a second switching element is an open circuit such that power stored in the output power storage element is delivered to the output when the voltage applied to the load is less then the threshold.

11. The apparatus of claim 1 further comprising a comparator for comparing the voltage applied to the output load to a reference voltage.

12. The apparatus of claim 11 wherein the bidirectional regulator is configured to generate the reference voltage.

13. The apparatus of claim 11 wherein the first switch and second switch are arranged as a boost converter when the voltage applied is greater than the reference voltage.

14. The apparatus of claim 11 wherein the first switch and second switch are arranged as a buck converter when the voltage applied is less than the reference voltage.

15. A method of regulating a power supply apparatus comprising:

sampling a voltage applied to a load with an output power bidirectional regulating circuit, the regulating circuit including control signals coupled to a plurality of switching elements for operating the switching elements selectively as boost and buck converters of the apparatus for supplying power;

sensing the voltage with the bidirectional regulating circuit; and

regulating the voltage to be in a predetermined range including;

storing power in a power storing element when the voltage applied to the load exceeds a threshold; and

supplying a compensating power to the load when the voltage applied to the load is less then the threshold;

generating a reference voltage from a reference input of the bidirectional regulating circuit,

comparing the reference voltage with the applied voltage;

configuring the plurality of switches as the boost converter when the sampled applied voltage is greater than the reference voltage, wherein the applied voltage is reduced by transferring excess power from the applied voltage to the power storing element; and

configuring the plurality of switches as the buck converter when the sampled applied voltage is less than the reference voltage, wherein the applied voltage is increased by transferring excess power from the power storing element to the applied voltage.

16. The method of claim 15, wherein a first switching element and a second switching element are configured such that the first switching element functions as a transistor and the second switching element functions as a diode, wherein the functions of the first and second switching element are alternately switched with each other by the control signals.

17. The method of claim 15, wherein the output power bidirectional regulating circuit comprises an integrated circuit coupled with an output power converting circuit.

18. The method of claim 15, wherein the applied voltage to the load is sampled using a sensing input of the bidirectional regulating circuit.

19. The method of claim 15, further comprising generating the control signals to configure a first switching element and a second switching element such that the first switching element functions as a transistor and the second switching element functions as a diode, wherein the functions of the first and second switching element are alternately switched with each other based on a difference between the reference voltage and the applied voltage.

20. The method of claim 15, further comprising an inductive element coupled with the plurality of switching elements.

21. The apparatus of claim 15, wherein the power storing element comprises a capacitor element.

22. The apparatus of claim 15, wherein the switching elements each comprise a semiconductor device.

23. The apparatus of claim 15, wherein the input power converting circuit is configured to convert an alternating current to a direct current.

24. A method of regulating a power supply apparatus comprising:

sampling a voltage applied to a load with an output power bidirectional regulating circuit, the regulating circuit including control signals coupled to a plurality of switching elements for operating the switching elements selectively as boost and buck converters of the apparatus for supplying power;

sensing the voltage with the bidirectional regulating circuit; and

regulating the voltage to be in a predetermined range including;

generating a reference voltage from a reference input of the bidirectional regulating circuit;

comparing the reference voltage with the applied voltage, wherein a first and a second switch are configured as the boost converter when the voltage is greater than the reference voltage;

storing power in a power storing element when the voltage applied to the load exceeds a threshold; and

supplying a compensating power to the load when the voltage applied to the load is less then the threshold.