Programmable power control system

• US 7,969,125 B2
• Filed: 12/31/2007
• Issued: 06/28/2011
• Est. Priority Date: 05/02/2007
• Status: Expired due to Fees

• Current Assignee: Cirrus Logic Incorporated
• Original Assignee: Cirrus Logic Incorporated
• Inventors: Melanson, John L.
• Primary Examiner(s): Berhane; Adolf
• Assistant Examiner(s): Mehari; Yemane
• Application Number:
  US11/967,275
• Publication Number:
  US 20080272747A1
• Time in Patent Office: 1,275 Days
• Field of Search: 323/205, 323282-283, 323/222, 323/284, 363/21.01, 363/21.02, 363/39, 341/143, 315/247
• US Class Current: 323/222
• CPC Class Codes: H02M 1/4225 using a non-isolated boost converter
• CPC Class Codes: H03M 3/476 Non-linear conversion systems
• 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
• CPC Class Codes: Y02P 80/10 Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier

Abstract

A power control system includes a switching power converter and a programmable power factor correction (PFC) and output voltage controller. The programmable PFC and output voltage controller generates a control signal to control power factor correction and voltage regulation of the switching power converter. In at least one embodiment, the control signal is a pulse width modulated signal. The programmability of the PFC and output voltage controller provides the programmable PFC and output voltage controller flexibility to operate in accordance with programmable parameters, to adapt to various operating environments, and to respond to various operating exigencies. In at least one embodiment, the programmable PFC and output voltage controller includes a state machine to process one or more programmable, operational parameters to determine the period and pulse width states of the control signal.

Claims

1. A programmable power factor correction (PFC) and output voltage controller to generate at least one control signal to control power factor correction of a power supply, the programmable PFC and output voltage controller comprising:

a memory to store one or more operational parameters of the PFC and output voltage controller, wherein at least one operational parameter is a control state equation operational parameter to determine at least one member of a group consisting of a period state and a pulse width state of a power factor correction control signal;

a pulse width and period control processor, coupled to the memory, to access each operational parameter and use each operational parameter to generate period state and pulse state output signals to respectively control period and pulse width states of the control signal; and

a pulse width modulator, coupled to the pulse width and period control processor, to generate the control signal in accordance with the period state and pulse state output signals.

2. The programmable PFC and output voltage controller of claim 1 wherein the memory includes a first control state equation operational parameter to set a minimum frequency for the control signal and a second control state equation operational parameter to set a maximum frequency of the control signal.

3. The programmable PFC and output voltage controller of claim 1 wherein the memory includes a first control state equation operational parameter to set a minimum output voltage and a second control state equation operational parameter to set a maximum output voltage, wherein the pulse width and period control processor is configured to determine a control signal that regulates an output voltage of the power supply within the first and second state equation operational parameters.

4. The programmable PFC and output voltage controller of claim 1 wherein the memory includes a control state equation operational parameter to set a minimum input voltage operational parameter, wherein the pulse width and period control processor is configured to generate the control signal in response to an input voltage below the minimum input voltage operational parameter.

5. The programmable PFC and output voltage controller of claim 1 wherein the memory includes a control signal spread spectrum strategy operational parameter, and the pulse width and period control processor is configured to generate the period state and pulse width state signals in accordance with the spread spectrum strategy.

6. The programmable PFC and output voltage controller of claim 1 wherein the memory includes a first control state equation operational parameter to set a minimum pulse width state of the control signal and a second control state equation operational parameter to set a maximum pulse width state of the control signal.

7. The programmable PFC and output voltage controller of claim 1 wherein the memory stores one or more preprocessing operational parameters that affect generation of the control signal.

8. The programmable PFC and output voltage controller of claim 7 wherein the pulse width and period control state machine includes a proportional integrator to process a power supply output voltage feedback signal, and the one or more preprocessing operational parameters include gain factors for the proportional integrator.

9. The programmable PFC and output voltage controller of claim 1 wherein the processor is a state machine.

10. The programmable PFC and output voltage controller of claim 1 wherein the memory is a nonvolatile memory.

11. The programmable PFC and output voltage controller of claim 1 wherein the memory is a one time programmable memory.

12. A method of generating at least one control signal to control power factor correction of a power supply, the method comprising:

accessing one or more operational parameters from a memory, wherein at least one operational parameter is a control state equation operational parameter to determine at least one member of a group consisting of a period state and a pulse width state of a power factor correction control signal;

using each operational parameter to generate period state and pulse state output signals to respectively control period and pulse width states of the control signal; and

generating the control signal in accordance with the period state and pulse state output signals.

13. The method of claim 12 wherein the memory includes a first control state equation operational parameter to set a minimum frequency for the control signal and a second control state equation operational parameter to set a maximum frequency of the control signal, wherein the method further comprises;

generating the control signal with a frequency included within the minimum and maximum frequency operation parameters.

14. The method of claim 12 wherein the memory includes a first control state equation operational parameter to set a minimum output voltage and a second control state equation operational parameter to set a maximum output voltage, the method further comprising:

determining a control signal that regulates an output voltage of the power supply within the first and second state equation operational parameters.

15. The method of claim 12 wherein the memory includes a control state equation operational parameter to set a minimum input voltage operational parameter, the method further comprising:

generating the control signal in response to an input voltage below the minimum input voltage operational parameter.

16. The method of claim 12 wherein the memory includes a control signal spread spectrum strategy operational parameter, the method further comprising:

generating the period state and pulse width state signals in accordance with the spread spectrum strategy.

17. The method of claim 12 wherein the memory includes a first control state equation operational parameter to set a minimum pulse width state of the control signal and a second control state equation operational parameter to set a maximum pulse width state of the control signal.

18. The method of claim 12 wherein the memory stores one or more preprocessing operational parameters that affect generation of the control signal.

19. The method of claim 18 wherein one or more preprocessing operational parameters include gain factors for the proportional integrator, the method further comprising:

generating a proportional integral of an output voltage feedback signal of the power supply using the operational parameter gain factors.

20. The method of claim 12 wherein the memory is a nonvolatile memory.

21. The method of claim 12 wherein the memory is one time programmable memory.

22. An apparatus for generating at least one control signal to control power factor correction of a power supply, the apparatus comprising:

means for accessing one or more operational parameters from a memory, wherein at least one operational parameter is a control state equation operational parameter to determine at least one member of a group consisting of a period state and a pulse width state of a power factor correction control signal;

means for using each operational parameter to generate period state and pulse state output signals to respectively control period and pulse width states of the control signal; and

means for generating the control signal in accordance with the period state and pulse state output signals.