Digital state controller for a high-voltage generator using the mixed-mode modulation method
First Claim
1. A power supply unit having a switching device (18) for converting an intermediate circuit voltage (UZ) into a switched voltage (UWR), and a resonant circuit (20) that is fed by the switched voltage (UWR) and has a transformer (T) for supplying an output voltage, and having a control device (30, 32) for setting at least one correcting variable (TPW) for actuating the switching device (18), where the control device (30, 32) is provided to process sample values of at least a first actual value (Uout) which depends on the output voltage, and to calculate a time difference value (Δ
- Uout) from two sample values, where the difference value (Δ
Uout) is multiplied by a first controller coefficient (kout) and the result is used in the calculation of the correcting variable (TPW), and where the value of the first controller coefficient (kout) is changeable as a function of the operating point of the power supply unit.
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Accused Products
Abstract
A description is given of a power supply unit, an X-ray device having a power supply unit, and a method of controlling a power supply unit. In order also to control non-linear control paths, such as of a power supply unit operated with mixed-mode modulation, it is proposed that the control device be designed as a digital control device which calculates at least one correcting variable. The control device processes at least a first actual value Uout, which depends on the output voltage. A time difference value is calculated from two sample values of the first actual value Uout and is multiplied by a first controller coefficient Kout. The value of the first controller coefficient can in this case change as a function of the operating point of the power supply unit.
20 Citations
11 Claims
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1. A power supply unit having
a switching device (18) for converting an intermediate circuit voltage (UZ) into a switched voltage (UWR), and a resonant circuit (20) that is fed by the switched voltage (UWR) and has a transformer (T) for supplying an output voltage, and having a control device (30, 32) for setting at least one correcting variable (TPW) for actuating the switching device (18), where the control device (30, 32) is provided to process sample values of at least a first actual value (Uout) which depends on the output voltage, and to calculate a time difference value (Δ - Uout) from two sample values,
where the difference value (Δ
Uout) is multiplied by a first controller coefficient (kout) and the result is used in the calculation of the correcting variable (TPW),and where the value of the first controller coefficient (kout) is changeable as a function of the operating point of the power supply unit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
- Uout) from two sample values,
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11. A method of controlling a power supply unit (10) having a switching device (18) for converting an intermediate circuit voltage (UZ) into a switched voltage (UWR), and a resonant circuit (20) that is fed by the switched voltage (UWR) and has a transformer (T), and possibly a rectifier circuit, for supplying an output voltage, in which, in order to form a correcting variable (TPW) for actuating the switching device
a time difference value (Δ - Uout) is calculated from sample values of a first actual value (Uout) and is multiplied by a first controller coefficient (kout),
where the value of the first controller coefficient (kout) can change as a function of the operating point of the power supply unit (10).
- Uout) is calculated from sample values of a first actual value (Uout) and is multiplied by a first controller coefficient (kout),
Specification