Voltage conversion method and voltage converter
First Claim
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1. A method in a voltage converter, wherein the method comprises in each of successive drive cycles:
- switching on for an on-period a first electronic switch connected in series with a primary winding of a transformer;
before switching on the first electronic switch, pre-magnetizing the transformer for a pre-magnetizing period;
receiving an input voltage by the voltage converter; and
adjusting the pre-magnetizing period dependent on a voltage level of the input voltage,wherein there is a first delay time between an end of the pre-magnetizing period and a beginning of the on-period.
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Abstract
In accordance with an embodiment, a method in a voltage converter includes, in each of successive drive cycles, switching on for an on-period a first electronic switch connected in series with a primary winding of a transformer. Before first electronic switch is switched on, the transformer is pre-magnetized for a pre-magnetizing period, where there is a first delay time between an end of the pre-magnetizing period and a beginning of the on-period.
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Citations
30 Claims
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1. A method in a voltage converter, wherein the method comprises in each of successive drive cycles:
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switching on for an on-period a first electronic switch connected in series with a primary winding of a transformer; before switching on the first electronic switch, pre-magnetizing the transformer for a pre-magnetizing period; receiving an input voltage by the voltage converter; and adjusting the pre-magnetizing period dependent on a voltage level of the input voltage, wherein there is a first delay time between an end of the pre-magnetizing period and a beginning of the on-period. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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12. The method of claim L wherein adjusting the pre-magnetizing period comprises increasing the pre-magnetizing period as the level of the input voltage increases.
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25. A voltage converter, comprising:
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a transformer comprising a primary winding; a first electronic switch connected in series with the primary winding; a control circuit configured in each of a plurality of successive drive cycles to switch on for an on-period the first electronic switch, before switching on the first electronic switch, to cause the transformer to be pre-magnetized for a pre-magnetizing period, and to generate a first delay time between an end of the pre-magnetizing period and a beginning of the on-period; an auxiliary winding of the transformer; a charge storage; and a second electronic switch coupled between the auxiliary winding and the charge storage, wherein the control circuit is further configured to switch on the second electronic switch in the pre-magnetizing period to cause the transformer to be pre-magnetized. - View Dependent Claims (26, 27)
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28. A method in a voltage converter, wherein the method comprises in each of successive drive cycles:
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switching on for an on-period a first electronic switch connected in series with a primary winding of a transformer; before switching on the first electronic switch, pre-magnetizing the transformer for a pre-magnetizing period, wherein there is a first delay time between an end of the pre-magnetizing period and a beginning of the on-period; receiving an input voltage by the voltage converter; and adjusting the first delay time dependent on a voltage level of the input voltage.
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29. A method in a voltage converter, wherein the method comprises in each of successive drive cycles:
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switching on for an on-period a first electronic switch connected in series with a primary winding of a transformer; before switching on the first electronic switch, pre-magnetizing the transformer for a pre-magnetizing period, wherein there is a first delay time between an end of the pre-magnetizing period and a beginning of the on-period; demagnetizing the transformer in a demagnetizing period after the on-period; capturing, in one drive cycle, an oscillation period of a voltage oscillation across the first electronic switch after the demagnetizing period; and adjusting the first delay time in a drive cycle after the one drive cycle based on the captured oscillation period.
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30. A method in a voltage converter, wherein the method comprises in each of successive drive cycles:
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switching on for an on-period a first electronic switch connected in series with a primary winding of a transformer; and before switching on the first electronic switch, pre-magnetizing the transformer for a pre-magnetizing period, wherein there is a first delay time between an end of the pre-magnetizing period and a beginning of the on-period, pre-magnetizing the transformer comprises switching on a second electronic switch different from the first electronic switch in the pre-magnetizing period, the transformer comprises a secondary winding and the voltage converter comprises a rectifier circuit coupled to the secondary winding, and the second electronic switch is coupled between a storage element in the rectifier circuit and the secondary winding.
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Specification