Method apparatus for energy conversion

• US 6,215,675 B1
• Filed: 09/08/1998
• Issued: 04/10/2001
• Est. Priority Date: 09/10/1997
• Status: Expired due to Fees

• Current Assignee: GE Medical Systems Norway AS (General Electric Company)
• Original Assignee: GE Medical Systems Norway AS (General Electric Company)
• Inventors: Laeuffer, Jacques, Planas, Thierry
• Primary Examiner(s): NGUYEN, MATTHEW VAN
• Application Number:
  US09/149,645
• Time in Patent Office: 945 Days
• Field of Search: 363/16, 363/17, 363/97, 363/98, 363/131, 363/132
• US Class Current: 363/17
• CPC Class Codes: H02M 3/3376 with automatic control of output voltage or current

Abstract

Method and apparatus for regulating a converter having transistors, in which the value of a number N₁ of state variables is measured and stored, then action is carried out on a number N₂ of control variables. N₁ being greater than N₂, the value of the control variables is calculated, at a given instant, for a number P of periods such that the product of N₂ multiplied by P is greater than or equal to N₁.

Claims

1. A method for regulating a converter having transistors, in which the value of a number N₁ of state variables is measured and stored, then action is carried out on a number N₂ of control variables, wherein, N₁ being greater than N₂, the value of the control variables is calculated, at a given instant, for a number P of periods such that the product of N₂ multiplied by P is greater than or equal to N₁.

2. The method according to claim 1, wherein N₂ is equal to unity and in that the control variable is a time variable.

3. The method according to claim 1 wherein regulation is of the proportional-integral type for one of the state variables and of the proportional type for the other state variables.

4. The method according to claim 2 wherein regulation is of the proportional-integral type for one of the state variables and of the proportional type for the other state variables.

5. The method according to claim 1 wherein the state variables are measured each time one of the state variables reaches a predetermined threshold value.

6. The method according to claim 5, wherein the state variables are measured each time one of the state variables reaches a zero value.

7. The method according to claim 1 wherein the state variables are the current I_1r in a series filtering inductor, the current I_1r in a parallel filtering inductor, the voltage V_cr across the terminals of a filtering capacitor, and the output voltage V_cf of the converter.

10. The apparatus according to claim 7, wherein the regulation is of the proportional-integral type for one of the state variables and of the proportional type for the other state variables.

12. The apparatus according to claim 1 comprising means for measuring state variables each time one of the state variables reaches a predetermined threshold value.

13. The apparatus according to claim 12 comprising means for measuring state variables each time one of the state variables reaches a zero value.

14. The apparatus according to claim 1 wherein the state variables are the current I_1r in a series filtering inductor, the current I_1p in a parallel filtering inductor, the voltage V_cr across the terminals of a filtering capacitor, and the output voltage V_cf of the converter.

8. An apparatus for regulating an energy conversion assembly, comprising means for discretely measuring the values of a number N₁ of state variables, and means for controlling a number N₂ of control variables, with the aim of obtaining, at the output of the control assembly, an optimum time variation of one or more of the state variables, it being possible for the variation of the energy conversion assembly over a period between two measuring instants to be estimated by knowing the state variables at the first measuring instant and the control variables during the period in question, comprising means for developing the values of the N₂ control variables over a number P of measuring instants, N₁ being greater than N₂, with P such that the product of N₂ multiplied by P is greater than or equal to N₁.

9. The apparatus according to claim 8, wherein N₂ is equal to unity and in that the control variable is a time variable.

11. The apparatus according to claim 8, wherein the regulation is of the proportional-integral type for one of the state variables and of the proportional type for the other state variables.