Back to results
US 9,178,438 B2Granted
Apparatus for resonant converters
AssigneeFuturewei Technologies, Inc.
InventorsDianbo Fu, Hengchun Mao, Heping Dai
Life of this patent
Estimating the term…
Abstract
A converter comprises a bridge and a resonant tank coupled between the bridge and an isolation transformer. The converter is configured such that the converter operates at a first constant-gain resonant frequency during a normal operation condition wherein a voltage gain of the converter is essentially insensitive to an output load change and the converter operates at a minimum-gain damping frequency during an abnormal operation condition wherein a voltage gain of the converter is approximately equal to zero.
Claims20
A converter comprising:
- a bridge including at least two switches coupled between an input voltage source and an isolation transformer;
- a resonant tank coupled to the bridge comprising five resonant components, wherein:
- the five resonant components are configured to provide:
- a first constant-gain resonant frequency, and wherein a voltage gain of the converter is essentially insensitive to an output load change when the converter operates at the first constant-gain resonant frequency;
- a minimum-gain damping frequency, and wherein a ratio of the minimum-gain damping frequency to the first constant-gain resonant frequency is in a range from about one and half to three and a voltage gain of the converter is approximately equal to zero when the converter operates at the minimum-gain damping frequency;
- and
- a second constant-gain resonant frequency, and wherein the second constant-gain resonant frequency is higher than the minimum-gain damping frequency;
- and
- a secondary rectifier coupled to the isolation transformer comprising at least two switches, wherein a dead time is placed between a first gate signal of a first switch of the secondary rectifier and a second gate signal of a second switch of the secondary rectifier.
6 more elements
An apparatus comprising:
- a resonant tank coupled between a bridge and a primary side of a transformer of a multiple constant gain resonant converter, wherein the resonant tank comprises:
- a first capacitor connected in series with a first inductor to form a first resonant device;
- a second capacitor connected in parallel with the first resonant device;
- a second inductor connected in series with the primary side of the transformer;
- and
- a magnetizing inductance of the transformer, and wherein the magnetizing inductance, the second inductor, the second capacitor and the first resonant device are configured such that the resonant tank provides:
- a first constant-gain resonant frequency, and wherein a voltage gain of the multiple constant gain resonant converter is essentially insensitive to an output load change when the multiple constant gain resonant converter operates at the first constant-gain resonant frequency;
- a minimum-gain damping frequency, and wherein a voltage gain of the multiple constant gain resonant converter is approximately equal to zero when the multiple constant gain resonant converter operates at the minimum-gain damping frequency;
- and
- a second constant-gain resonant frequency, and wherein the second constant-gain resonant frequency is higher than the minimum-gain damping frequency;
- and
- a secondary rectifier coupled to a secondary side of the transformer, wherein a switching frequency of the secondary rectifier is approximately equal to the first constant-gain resonant frequency.
9 more elements
A method comprising:
- providing a resonant tank coupled to a bridge and a primary side of a transformer of a power converter, wherein the resonant tank comprises:
- a first resonant component connected in series with a second resonant component to form a first resonant device;
- a third resonant component connected in parallel with the first resonant device;
- a fourth resonant component connected in series with the primary side of the transformer;
- and
- a fifth resonant component connected in parallel with the primary side of the transformer;
- in a normal operation condition, configuring the power converter such that the power converter operates at a first constant-gain resonant frequency, wherein, at the first constant-gain resonant frequency, a voltage gain of the power converter is essentially insensitive to an output load change;
- and
- in an abnormal operation condition, configuring the power converter such that the power converter operates at a minimum-gain damping frequency, wherein, at the minimum-gain damping frequency, a voltage gain of the converter is approximately equal to zero.
6 more elements
Dependencies are inferred from the claim text.