Method of controlling a dc-to-dc converter
Abstract
Abstract A HIGH-POWER DC-TO-DC CONVERTER (OR "CHOPPER") SYSTEM PROVIDES AN INPUT VOLTAGE V1 OF SUBSTANTIALLY CONSTANT LEVEL TO A CHOPPER WHICH INCLUDES A SWITCH. THE OPENED AND CLOSED TIMES OF THE SWITCH ARE CONTROLLED TO PASS AN OUTPUT VOLTAGE VO OF VARIABLE MAGNITUDE THROUGH A FILTER TO A LOAD. A CONTROL CIRCUIT IS CONNECTED TO ACTUATE THE CHOPPER OVER A VARIABLE FREQUENCY RANGE, AND PRACTICAL OPERATING CONDITIONS SUCH AS HEATING OF THE SWITCH IMPOSE AN UPPER LIMIT ON THIS FREQUENCY RANGE. THE CHOPPER IS OPERATED SUCH THAT THE OUTPUT VOLTAGE VO IS ONE-HALF THE INPUT VOLTAGE VI AT THE MAXIMUM OPERATING FREQUENCY OF THE CHOPPER. TO PROVIDE LEVELS OF OUTPUT VOLTAGE VO LESS THAN HALF VI, THE FREQUENCY IS GRADUALLY REDUCED AS THE CHOPPER ON DWELL TIME IS MAINTAINED APPROXIMATELY CONSTANT OR ALLOWED TO DECREASE. TO PROVIDE LEVELS OF OUTPUT VOLTAGE VO GREATER THAN ONE-HALF THE INPUT VOLTAGE VI, THE CHOPPER OPERATING FREQUENCY IS GRADUALLY REDUCED AS THE CHOPPER OFF DWELL TIME IS MAINTAINED SUBSTANTIALLY CONSTANT OR ALLOWED TO DECREASE. CIRCUIT DETAILS OF A CONTROL CIRCUIT FOR OPERATING THE CHOPPER ACCORDING TO THIS METHOD ARE SET OUT.
Inventors
- 👤 George H Studtmann
- 👤 Raymond J Yarema
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
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| 3.5 Years (Year 4) | 1974-01-25 | 1974-07-27 | 1975-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-25 | 1978-07-27 | 1979-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-25 | 1982-07-27 | 1983-01-26 | $7700.00 | Window Closed / Lapsed |