Switching power supply, amplification device, and communication device
AssigneeFujitsu Limited
InventorTatsuya Hirose
Life of this patent
Estimating the term…
Abstract
A switching power supply includes a switching power supply circuit that has an upper arm and a lower arm that are coupled in series. The switching power supply further includes a drive circuit that alternately turns on the upper arm and the lower arm across a dead time in which the upper arm and the lower arm are turned off such that an output voltage of the switching power supply circuit follows a voltage of an input signal that is an envelope signal or a subcarrier signal; and an adjustment circuit that adjusts the dead time according to the voltage of the input signal.
Claims12
A switching power supply comprising:
- a switching power supply circuit that has an upper arm and a lower arm that are coupled in series;
- a drive circuit that alternately turns on the upper arm and the lower arm across a dead time in which the upper arm and the lower arm are turned off such that an output voltage of the switching power supply circuit follows a voltage of an input signal that is an envelope signal or a subcarrier signal;
- and
- an adjustment circuit that adjusts the dead time according to the voltage of the input signal.
An amplification device comprising:
- an extractor that extracts an input signal that is an envelope signal or a subcarrier signal from a modulated wave;
- an amplifier that amplifies the modulated wave;
- a switching power supply circuit that has an upper arm and a lower arm that are coupled in series and generates an output voltage that is a power supply voltage of the amplifier;
- a drive circuit that alternately turns on the upper arm and the lower arm across a dead time in which the upper arm and the lower arm are turned off such that the output voltage follows a voltage of the input signal;
- and
- an adjustment circuit that adjusts the dead time according to the voltage of the input signal.
A communication device comprising:
- an extractor that extracts an input signal that is an envelope signal or a subcarrier signal from a modulated wave;
- an amplifier that amplifies the modulated wave;
- an antenna fed by the amplifier;
- a switching power supply circuit that has an upper arm and a lower arm that are coupled in series and generates an output voltage that is a power supply voltage of the amplifier;
- a drive circuit that alternately turns on the upper arm and the lower arm across a dead time in which the upper arm and the lower arm are turned off such that the output voltage follows a voltage of the input signal that is the envelope signal or the subcarrier signal;
- and
- an adjustment circuit that adjusts the dead time according to the voltage of the input signal.
Dependencies are inferred from the claim text.