Method and a circuit arrangement for determining a demagnetization zero current time
AssigneeInfineon Technologies AG
InventorsMarc Fahlenkamp, Ordwin Haase
Life of this patent
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Abstract
In various embodiments a method for determining a demagnetization zero current time, at which a transformer is substantially demagnetized, for a switched mode power supply comprising a transformer is provided, wherein the method may include: applying a first current through a winding of one side of the transformer; interrupting the current flow of the first current; measuring a time at which a voltage across a winding of another side of the transformer becomes substantially zero; and determining the demagnetization zero current time using the measured time.
Claims25
A method for determining a demagnetization zero current time period, during which a transformer is substantially demagnetized, for a switched mode power supply, comprising a transformer having a first side and a second side, the method comprising:
- applying a first current through a winding of the first side of the transformer;
- interrupting the current flow of the first current;
- measuring a time period triggered by the interruption of the current flow of the first current and finishing at a time at which a voltage across a winding of the second side of the transformer becomes substantially zero;
- determining the demagnetization zero current time period using the measured time period.
A method for controlling a switched mode power supply comprising a transformer and a first side and a second side being galvanically separated from each other, the method comprising:
- determining a demagnetization zero current time period for the switched mode power supply, the determining comprising:
- applying a first current through a winding of the first side of the transformer;
- interrupting the current flow of the first current;
- measuring a time period triggered by the interruption of the current flow of the first current and finishing at a time at which a voltage across a winding of the second side of the transformer becomes substantially zero;
- determining the demagnetization zero current time period using the measured time period;
- and
- controlling the switched mode power supply in accordance with the determined demagnetization zero current time period.
A circuit arrangement for determining a demagnetization zero current time period, during which a transformer is substantially demagnetized, for a switched mode power supply comprising a transformer and a first side and a second side being galvanically separated from each other, the circuit arrangement comprising:
- a current supply configured to apply a first current through a winding of the first side of the transformer;
- a control circuit configured to interrupt the current flow of the first current;
- a measuring circuit configured to measure a time period triggered by the interruption of the current flow of the first current and finishing at a time at which a voltage across a winding of the second side of the transformer becomes substantially zero;
- a determining circuit configured to determine the demagnetization zero current time period using the measured time period.
A circuit arrangement for controlling a switched mode power supply comprising a transformer and a first side and a second side being galvanically separated from each other, the circuit arrangement comprising:
- a determining circuit configured to determine a demagnetization zero current time period, during which the transformer is substantially demagnetized, for the switched mode power supply, the determining circuit comprising:
- a current supply configured to apply a first current through a winding of the first side of the transformer;
- a control circuit configured to interrupt the current flow of the first current;
- a measuring circuit configured to measure a time period triggered by the interruption of the current flow of the first current and finishing at a time at which a voltage across a winding of the second side of the transformer becomes substantially zero;
- a determiner circuit configured to determine the demagnetization zero current time period using the measured time period;
- and
- a controller configured to control the switched mode power supply in accordance with the determined demagnetization zero current time period.
A circuit arrangement, comprising:
- a switched mode power supply comprising:
- a transformer and a first side and a second side being galvanically separated from each other;
- a determining circuit configured to determine a demagnetization zero current time period, at during which the transformer is substantially demagnetized, for the switched mode power supply, the determining circuit comprising:
- a current supply configured to apply a first current through a winding of the first side of the transformer;
- a control circuit configured to interrupt the current flow of the first current;
- a measuring circuit configured to measure a time period triggered by the interruption of the current flow of the first current and finishing at a time at which a voltage across a winding of the second side of the transformer becomes substantially zero;
- a determiner circuit configured to determine the demagnetization zero current time period using the measured time period;
- and
- a controller configured to control the switched mode power supply in accordance with the determined demagnetization zero current time period.
Dependencies are inferred from the claim text.