Wireless power feedback loop and control system for wireless coil in mri system

A power control system for a magnetic resonance imaging (MRI) system, comprising:

• a power source configured to wirelessly provide electrical energy;
• and
• a local coil, comprising:
• a wireless power receiver configured to convert electrical energy to alternating current (AC) electricity, the electrical energy being wirelessly received from the power source;
• an AC-direct current (DC) converter configured to convert the AC electricity to first DC electricity having a first voltage;
• a DC-DC converter configured to convert the first DC electricity to second DC electricity having a second voltage;
• a comparator configured to compare the first voltage and the second voltage, and generating a level signal based on the comparison result;
• and
• a transmitter configured to send the level signal to the power source;
• wherein the power source is further configured to adjust an output power of the electrical energy based on the level signal.

A local coil for a magnetic resonance imaging (MRI) system, comprising:

• a wireless power receiver configured to convert electrical energy to alternating current (AC) electricity, the electrical energy being wirelessly received from a power source;
• a coupler configured to distribute power of the AC electricity according to a predetermined ratio;
• an AC-direct current (DC) converter configured to convert AC electricity from the coupler to DC electricity;
• an operational amplifier configured to determine, based on AC electricity from the coupler, a DC voltage corresponding to a power of AC electricity before distribution;
• an analog-digital converter (ADC) configured to convert the DC voltage to a digital quantity;
• and
• a transmitter configured to send a DC voltage of the digital quantity to the power source, the power source adjusting an output power of the electrical energy based on the DC voltage of the digital quantity.

A power control system for a magnetic resonance imaging (MRI) system, comprising:

• a power source configured to wirelessly provide electrical energy;
• and
• a local coil, comprising:
• a wireless power receiver configured to convert electrical energy to alternating current (AC) electricity, the electrical energy being wirelessly received from the power source;
• a coupler configured to distribute power of the AC electricity according to a predetermined ratio;
• an AC-direct current (DC) converter configured to convert AC electricity from the coupler to DC electricity;
• an operational amplifier configured to determine, based on AC electricity from the coupler, a DC voltage corresponding to a power of AC electricity before distribution;
• an analog-digital converter (ADC) configured to convert the DC voltage to a digital quantity;
• and
• a transmitter configured to send a DC voltage of the digital quantity to the power source;
• wherein the power source is further configured to adjust an output power of the electrical energy based on the DC voltage of the digital quantity.

A power control method for a magnetic resonance imaging (MRI) system, comprising:

• generating a radio frequency (RF) signal;
• sending the RF signal to wirelessly transmit electrical energy to a local coil;
• receiving a level signal from the local coil;
• and
• adjusting an output power of the electrical energy based on the level signal;
• wherein, at the local coil:
• the electrical energy is converted to alternating current (AC) electricity, the AC electricity being converted to first direct current (DC) electricity having a first voltage, the first DC electricity being converted to second DC electricity having a second voltage, and the level signal being generated based on the result of comparing the first voltage and the second voltage.

A power control method for a magnetic resonance imaging (MRI) system, comprising:

• generating a radio frequency (RF) signal;
• sending the RF signal to wirelessly transmit electrical energy to a local coil;
• receiving a direct current (DC) voltage of a digital quantity from the local coil;
• adjusting an output power of the electrical energy based on the DC voltage of the digital quantity;
• wherein, at the local coil:
• the electrical energy is converted to alternating current (AC) electricity, a power of the AC electricity being measured and the AC electricity being converted to DC electricity, the measured power of the AC electricity being converted to a DC voltage, and the DC voltage being converted to the digital quantity.