Functional control block for voltage regulator with dual servo loops

• US 5,612,612 A
• Filed: 12/21/1995
• Issued: 03/18/1997
• Est. Priority Date: 12/21/1995
• Status: Expired due to Fees

• Current Assignee: Aphex Systems, Ltd. (RØDE Microphones)
• Original Assignee: Aphex Systems, Ltd. (RØDE Microphones)
• Inventors: Werrbach, Donn
• Primary Examiner(s): Krishnan, Aditya
• Application Number:
  US08/576,223
• Time in Patent Office: 453 Days
• Field of Search: 323/285, 323/273-280, 323/299, 323/503, 323/901, 323/349, 323/282, 307/44-46, 307/48, 307/66, 330/85, 330/260, 330/300, 330/253, 363/8, 363/44, 363/45, 363/47-48, 363/84, 363/88-89, 363/80-81, 363/129
• US Class Current: 323/285
• CPC Class Codes: H02M 3/156 with automatic control of output voltage or current, e.g. switching regulators

Abstract

A functional control block (FCB) device for use in conjunction with a signal regulating apparatus which has a signal regulator for producing an output signal and delivers an actual signal on a load through an external conductor, and which further has an inner servo loop and an outer servo loop. The FCB device includes a first input connected to the signal regulator, and a second input connected to the outer servo loop. The FCB device has an internal functional signal processing circuity for processing an output signal from the signal regulator, and the signal from the outer servo loop, and producing a functional sense signal and a functional reference signal. The FCB device further has a first output connected to a sense input of the inner servo loop for delivering the functional sense signal, and a second output connected to a reference input of the inner servo loop for delivering the functional reference signal. The functional sense signal and the functional reference signal produced by the FCB device are functions of the output signal of the signal regulator and the actual signal on the load.

Claims

1. A functional control block device for use in conjunction with a signal regulating apparatus that includes a signal regulator having an input, an output and a control terminal for receiving an input signal at its input and generating an output signal at its output and delivering an actual signal on a load through an external conductor, an inner servo loop having a sense input and a reference input, and an output connected to the control terminal of the signal regulator for generating and delivering an inner servo loop control signal to the signal regulator to control the output signal of the signal regulator, and an outer servo loop having an input connected to the load and an output for generating and delivering an outer servo loop control signal which is responsive to the actual signal on the load, the functional control block device comprising:

a. a first input connected to said output of said signal regulator for receiving said output signal from said signal regulator;

b. a second input connected to said output of said outer servo loop for receiving said outer servo loop control signal from said outer servo loop;

c. an internal functional signal processing circuity for processing said output signal of said signal regulator and said outer servo loop control signal of said outer servo loop and producing a functional sense signal and a functional reference signal;

d. a first output connected to said sense input of said inner servo loop for delivering said functional sense signal to said inner servo loop; and

e. a second output connected to said reference input of said inner servo loop for delivering said functional reference signal to said inner servo loop;

f. whereby said functional sense signal and said functional reference signal produced by said functional control block device are functions of said output signal of said signal regulator and said actual signal on said load.

2. The device as defined in claim 1 wherein said internal functional signal processing circuity includes:

a. a first functional control block having a first input coupled to said first input of said functional control block device for receiving said output signal from said signal regulator, a second input coupled to said second input of said functional control block device for receiving said outer servo loop control signal from said outer servo loop, and an output coupled to said first output of said functional control block device, where the first functional control block produces said functional sense signal as a function of said output signal and said outer servo loop control signal; and

b. a second functional control block having an input coupled to a signal reference which provides a reference signal, and an output coupled to said second output of said functional control block device, where the second functional control block produces said functional reference signal as a function of the reference signal.

3. The device as defined in claim 1 wherein said internal functional signal processing circuity includes:

a. a first functional control block having an input coupled to said first input of said functional control block device for receiving said output signal from said signal regulator, and an output coupled to said first output of said functional control block device, where the first functional control block produces said functional sense signal as a function of said output signal; and

b. a second functional control block having a first input coupled to a signal reference which provides a reference signal, a second input coupled to said second input of said functional control block device for receiving said outer servo loop control signal from said outer servo loop, and an output coupled to said second output of said functional control block device, where the second functional control block produces said functional reference signal as a function of the reference signal and said outer servo loop control signal.

4. The device as defined in claim 1 wherein said internal functional signal processing circuity includes:

a. a first functional control block having a first input coupled to said first input of said functional control block device for receiving said output signal from said signal regulator, a second input, and an output coupled to said first output of said functional control block device;

b. a second functional control block having a first input coupled to a signal reference which provides a reference signal, a second input, and an output coupled to said second output of said functional control block device;

c. a third functional control block having an input coupled to said second input of said functional control block device for receiving said outer servo loop control signal from said outer servo loop, a first output coupled to said second input of said first functional control block, and a second output coupled to said second input of said second functional control block;

d. where said third functional control block produces a first output signal as a function of said outer servo loop control signal, and a second output signal also as a function of said outer servo loop control signal;

e. where said first functional control block produces said functional sense signal as a function of said output signal of said signal regulator and said first output signal of said third functional control block; and

f. where said second functional control block produces said functional reference signal as a function of said reference signal of said signal reference and said second output signal of said third functional control block.

5. The device as defined in claim 1 wherein said internal functional signal processing circuity includes an adding functional control block.

6. The device as defined in claim 1 wherein said internal functional signal processing circuity includes a subtracting functional control block.

7. The device as defined in claim 1 wherein said internal functional signal processing circuity includes a multiplying functional control block.

8. The device as defined in claim 1 wherein said internal functional signal processing circuity includes a dividing functional control block.

9. The device as defined in claim 1 wherein said internal functional signal processing circuity includes a resistive summing functional control block.

10. The device as defined in claim 1 wherein said internal functional signal processing circuity includes a differential amplifier functional control block.

11. The device as defined in claim 1 wherein said internal functional signal processing circuity includes a transistor functional control block.

12. The device as defined in claim 1 wherein said internal functional signal processing circuity includes a JFET functional control block.

13. The device as defined in claim 1 wherein said internal functional signal processing circuity includes a light dependent resistor functional control block.

14. The device as defined in claim 1 wherein said internal functional signal processing circuity includes a voltage controlled amplifier functional control block.

15. The device as defined in claim 1 wherein said internal functional signal processing circuity includes an optoisolator functional control block.

16. A signal regulating apparatus comprising:

a. a signal regulator having an input, an output and a control terminal for receiving an input signal at its input, generating an output signal at its output, and delivering an actual signal on a load through an external conductor;

b. an inner servo loop having a sense input, a reference input, and an output connected to said control terminal of said signal regulator for generating an inner servo loop control signal, and delivering the inner servo loop control signal to said signal regulator to control said output signal of said signal regulator;

c. an outer servo loop having an input connected to the load and an output for generating an outer servo loop control signal which is responsive to said actual signal on said load, and delivering said outer servo loop control signal;

d. a functional control block device having a first input, a second input, a first output and a second output;

e. said first input of said functional control block device connected to said output of said signal regulator for receiving said output signal from said signal regulator;

f. said second input of said functional control block device connected to said output of said outer servo loop for receiving said outer servo loop control signal from said outer servo loop;

g. said functional control block device having an internal functional signal processing circuity for processing said output signal of said signal regulator and said outer servo loop control signal of said outer servo loop and producing a functional sense signal and a functional reference signal;

h. said first output of said functional control block device connected to said sense input of said inner servo loop for delivering said functional sense signal to said inner servo loop; and

i. said second output of said functional control block device connected to said reference input of said inner servo loop for delivering said functional reference signal to said inner servo loop;

j. whereby said functional sense signal and said functional reference signal produced by said functional control block device are functions of said output signal of said signal regulator and said actual signal on said load.

17. The apparatus as defined in claim 16 wherein said signal regulator is a switch mode voltage regulator.

18. The apparatus as defined in claim 16 wherein said inner servo loop includes an inner servo loop comparator and an inner servo loop filter.

19. The apparatus as defined in claim 16 wherein said outer servo loop includes an outer servo loop comparator and an outer servo loop filter.

20. The apparatus as defined in claim 16 wherein said internal functional signal processing circuity includes:

a. a first functional control block having a first input coupled to said first input of said functional control block device for receiving said output signal from said signal regulator, a second input coupled to said second input of said functional control block device for receiving said outer servo loop control signal from said outer servo loop, and an output coupled to said first output of said functional control block device, where the first functional control block produces said functional sense signal as a function of said output signal and said outer servo loop control signal; and

b. a second functional control block having an input coupled to a signal reference which provides a reference signal, and an output coupled to said second output of said functional control block device, where the second functional control block produces said functional reference signal as a function of the reference signal.

21. The apparatus as defined in claim 16 wherein said internal functional signal processing circuity includes:

a. a first functional control block having an input coupled to said first input of said functional control block device for receiving said output signal from said signal regulator, and an output coupled to said first output of said functional control block device, where the first functional control block produces said functional sense signal as a function of said output signal; and

b. a second functional control block having a first input coupled to a signal reference which provides a reference signal, a second input coupled to said second input of said functional control block device for receiving said outer servo loop control signal from said outer servo loop, and an output coupled to said second output of said functional control block device, where the second functional control block produces said functional reference signal as a function of the reference signal and said outer servo loop control signal.

22. The apparatus as defined in claim 16 wherein said internal functional signal processing circuity includes:

a. a first functional control block having a first input coupled to said first input of said functional control block device for receiving said output signal from said signal regulator, a second input, and an output coupled to said first output of said functional control block device;

b. a second functional control block having a first input coupled to a signal reference which provides a reference signal, a second input, and an output coupled to said second output of said functional control block device;

c. a third functional control block having an input coupled to said second input of said functional control block device for receiving said outer servo loop control signal from said outer servo loop, a first output coupled to said second input of said first functional control block, and a second output coupled to said second input of said second functional control block;

d. where said third functional control block produces a first output signal as a function of said outer servo loop control signal, and a second output signal also as a function of said outer servo loop control signal;

e. where said first functional control block produces said functional sense signal as a function of said output signal of said signal

regulator and said first output signal of said third functional control block; and

f. where said second functional control block produces said functional reference signal as a function of said reference signal of said signal reference and said second output signal of said third functional control block.

23. The apparatus as defined in claim 16 wherein said internal functional signal processing circuity includes an adding functional control block.

24. The apparatus as defined in claim 16 wherein said internal functional signal processing circuity includes a subtracting functional control block.

25. The apparatus as defined in claim 16 wherein said internal functional signal processing circuity includes a multiplying functional control block.

26. The apparatus as defined in claim 16 wherein said internal functional signal processing circuity includes a dividing functional control block.

27. The apparatus as defined in claim 16 wherein said internal functional signal processing circuity includes a resistive summing functional control block.

28. The apparatus as defined in claim 16 wherein said internal functional signal processing circuity includes a differential amplifier functional control block.

29. The apparatus as defined in claim 16 wherein said internal functional signal processing circuity includes a transistor functional control block.

30. The apparatus as defined in claim 16 wherein said internal functional signal processing circuity includes a JFET functional control block.

31. The apparatus as defined in claim 16 wherein said internal functional signal processing circuity includes a light dependent resistor functional control block.

32. The apparatus as defined in claim 16 wherein said internal functional signal processing circuity includes a voltage controlled amplifier functional control block.

33. The apparatus as defined in claim 16 wherein said internal functional signal processing circuity includes an optoisolator functional control block.

34. A method for improve the performance of a signal regulator circuit that includes a signal regulator having an input, an output and a control terminal for receiving an input signal at its input and generating an output signal at its output and delivering an actual signal on a load through an external conductor, an inner servo loop having a sense input and a reference input, and an output connected to the control terminal of the signal regulator for generating and delivering an inner servo loop control signal to the signal regulator to control the output signal of the signal regulator, and an outer servo loop having an input connected to the load and an output for generating and delivering an outer servo loop control signal which is responsive to the actual signal on the load, the method comprising the steps of:

a. providing a functional control block having a first input, a second input, a first output and a second output;

b. connecting said first input of said functional control block to said output of said signal regulator for receiving said output signal from said signal regulator;

c. connecting said second input of said functional control block to said output of said outer servo loop for receiving said outer servo loop control signal from said outer servo loop;

d. providing an internal functional signal processing circuity in said functional control block for processing said output signal of said signal regulator and said outer servo loop control signal of said outer servo loop and producing a functional sense signal and a functional reference signal;

e. connecting said first output of said functional control block to said sense input of said inner servo loop for delivering said functional sense signal to said inner servo loop; and

f. connecting said second output of said functional control block to said reference input of said inner servo loop for delivering said functional reference signal to said inner servo loop;

g. whereby said functional sense signal and said functional reference signal produced by said functional control block are functions of said output signal of said signal regulator and said actual signal on said load.

35. The method as defined in claim 34 further comprising the steps of:

a. providing a first functional control block in said internal functional signal processing circuitry, the first functional control block having a first input coupled to said first input of said functional control block device for receiving said output signal from said signal regulator, a second input coupled to said second input of said functional control block device for receiving said outer servo loop control signal from said outer servo loop, and an output coupled to said first output of said functional control block device, where the first functional control block produces said functional sense signal as a function of said output signal and said outer servo loop control signal; and

b. providing a second functional control block in said internal functional signal processing circuitry, the second functional control block having an input coupled to a signal reference which provides a reference signal, and an output coupled to said second output of said functional control block device, where the second functional control block produces said functional reference signal as a function of the reference signal.

36. The method as defined in claim 34 further comprising the steps of:

a. providing a first functional control block in said internal functional signal processing circuity, the first functional control block having an input coupled to said first input of said functional control block device for receiving said output signal from said signal regulator, and an output coupled to said first output of said functional control block device, where the first functional control block produces said functional sense signal as a function of said output signal; and

b. providing a second functional control block in said internal functional signal processing circuity, the first functional control block having a first input coupled to a signal reference which provides a reference signal, a second input coupled to said second input of said functional control block device for receiving said outer servo loop control signal from said outer servo loop, and an output coupled to said second output of said functional control block device, where the second functional control block produces said functional reference signal as a function of the reference signal and said outer servo loop control signal.

37. The method as defined in claim 34 further comprising the steps of:

a. providing a first functional control block in said internal functional signal processing circuity, the functional control block having a first input coupled to said first input of said functional control block device for receiving said output signal from said signal regulator, a

second input, and an output coupled to said first output of said functional control block device;

b. providing a second functional control block in said internal functional signal processing circuity, the functional control block having a first input coupled to a signal reference which provides a reference signal, a second input, and an output coupled to said second output of said functional control block device;

c. providing a third functional control block in said internal functional signal processing circuity, the functional control block having an input coupled to said second input of said functional control block device for receiving said outer servo loop control signal from said outer servo loop, a first output coupled to said second input of said first functional control block, and a second output coupled to said second input of said second functional control block;

d. where said third functional control block produces a first output signal as a function of said outer servo loop control signal, and a second output signal also as a function of said outer servo loop control signal;

e. where said first functional control block produces said functional sense signal as a function of said output signal of said signal regulator and said first output signal of said third functional control block; and

f. where said second functional control block produces said functional reference signal as a function of said reference signal of said signal reference and said second output signal of said third functional control block.

38. The method as defined in claim 34 further comprising the step of utilizing an adding functional control block in said internal functional signal processing circuity.

39. The method as defined in claim 34 further comprising the step of utilizing a subtracting functional control block in said internal functional signal processing circuity.

40. The method as defined in claim 34 further comprising the step of utilizing a multiplying functional control block in said internal functional signal processing circuity.

41. The method as defined in claim 34 further comprising the step of utilizing a dividing functional control block in said internal functional signal processing circuity.

42. The method as defined in claim 34 further comprising the step of utilizing a resistive summing functional control block in said internal functional signal processing circuity.

43. The method as defined in claim 34 further comprising the step of utilizing a differential amplifier functional control block in said internal functional signal processing circuity.

44. The method as defined in claim 34 further comprising the step of utilizing a transistor functional control block in said internal functional signal processing circuity.

45. The method as defined in claim 34 further comprising the step of utilizing a JFET functional control block in said internal functional signal processing circuity.

46. The method as defined in claim 34 further comprising the step of utilizing a light dependent resistor functional control block in said internal functional signal processing circuity.

47. The method as defined in claim 34 further comprising the step of utilizing a voltage controlled amplifier functional control block in said internal functional signal processing circuity.

48. The method as defined in claim 34 further comprising the step of utilizing an optoisolator functional control block in said internal functional signal processing circuity.