Apparatus and method for high efficiency variable power transmission

A high efficiency variable power transmitting apparatus comprising:

• a high frequency signal generating unit configured to generate a high frequency signal having a constant amplitude;
• a power amplifier (PA) configured to amplify the high frequency signal to satisfy a requested power level of a target device based on a variable power supply voltage;
• and
• a variable power supply configured to convert an alternating current (AC) voltage received from a power source to a direct current (DC) voltage, modulate the DC voltage with respect to a time axis by turning the DC voltage ON and OFF to generate the variable power supply voltage, and provide the variable power supply voltage to the PA.

A high efficiency variable power transmitting method comprising:

• converting an alternating current (AC) voltage received from a power source to a direct current (DC) voltage;
• generating a power supply voltage having a predetermined level based on the DC voltage;
• providing the power supply voltage having the predetermined level to a power amplifier (PA);
• outputting a variable power by modulating, with respect to a time axis, a high frequency signal having a constant amplitude by turning the high frequency signal ON and OFF;
• and
• amplifying, using the PA, the variable power to satisfy a requested power level of a target device based on the power supply voltage having the predetermined level.

A high efficiency variable power transmitting method comprising:

• converting an alternating current (AC) voltage received from a power source to a direct current (DC) voltage;
• generating a variable power supply voltage by modulating the DC voltage with respect to a time axis by turning the DC voltage ON and OFF;
• providing the variable power supply voltage to a power amplifier (PA);
• generating a high frequency signal having a constant amplitude;
• and
• amplifying, using the PA, the high frequency signal to satisfy a requested power level of a target device based on the variable power supply voltage.

A variable power transmitting apparatus comprising:

• a variable power generating unit configured to output a high frequency signal having ON states and OFF states having a duty cycle depending on a requested power level of a target device, the high frequency signal having a constant amplitude during the ON states;
• a power supply configured to output a power supply voltage having a fixed predetermined level;
• and
• a power amplifier (PA) operated by the power supply voltage having the fixed predetermined level and configured to amplify the high frequency signal to output a variable power satisfying the requested power level of the target device.

A variable power transmitting apparatus comprising:

• a high frequency signal generating unit configured to output a high frequency signal having ON states and OFF states having a duty cycle depending on a requested power level of a target device, the high frequency signal having a constant amplitude during the ON states;
• a variable power supply configured to output a variable power supply voltage having ON states and OFF states having a duty cycle depending on a requested power level of a target device, the variable power supply voltage having a fixed predetermined level during the ON states;
• and
• a power amplifier (PA) operated by the variable power supply voltage and configured to amplify the high frequency signal to output a variable power satisfying the requested power level of the target device.