A radio-frequency (RF) coil assembly for acquiring magnetic resonance (MR) signals, comprising: - at least one radio-frequency (RF) receive coil (246-x) configured for acquiring the MR signals; - a detune circuit (248-x) comprising one or more circuit arms (A, B) serially coupled to the at least one RF receive coil (246-x), each of the one or more circuit arms (A B) having at least two low-loss switches serially coupled to each other; - a charge control circuit coupled to each of the one or more circuit arms (A, B) at a location that is between the at least two serially-coupled low-loss switches of each of the one or more circuit arms (A, B) and configured to draw power from the RF receive coil (246-x) during a detune state; and - an energy storage device coupled to the charge control circuit and configured to store the drawn power, characterized in that - the charge control circuit further comprises at least one power control switch configured to selectively control the draw of power from the RF receive coil (246-x), - the at least one power control switch being coupled in series with the energy storage device and to each of the one or more circuit arms at a location that is between the at least two serially-coupled loss switches of each of the one or more circuit arms and wherein - the detune circuit (248-x) is configured to control impedance of the receive coil (246-x) to tune or detune the receive coil (246-x) during tune or detune states, wherein the at least one power control switch is configured for control of its duty cycle of conductivity by a charge control signal (CHR), thereby allowing to control an amount of charge delivered to the energy storage device, wherein fine temporal modification of the charge control signal (CHR) allows a desired amount of power to be extracted from the RF receive coil (246-x) coupled to the detune circuit (248-x). - at least one radio-frequency (RF) receive coil (246-x) configured for acquiring the MR signals; - a detune circuit (248-x) comprising one or more circuit arms (A, B) serially coupled to the at least one RF receive coil (246-x), each of the one or more circuit arms (A B) having at least two low-loss switches serially coupled to each other; - a charge control circuit coupled to each of the one or more circuit arms (A, B) at a location that is between the at least two serially-coupled low-loss switches of each of the one or more circuit arms (A, B) and configured to draw power from the RF receive coil (246-x) during a detune state; and - an energy storage device coupled to the charge control circuit and configured to store the drawn power, - the charge control circuit further comprises at least one power control switch configured to selectively control the draw of power from the RF receive coil (246-x), - the at least one power control switch being coupled in series with the energy storage device and to each of the one or more circuit arms at a location that is between the at least two serially-coupled loss switches of each of the one or more circuit arms and wherein - the detune circuit (248-x) is configured to control impedance of the receive coil (246-x) to tune or detune the receive coil (246-x) during tune or detune states, wherein the at least one power control switch is configured for control of its duty cycle of conductivity by a charge control signal (CHR), thereby allowing to control an amount of charge delivered to the energy storage device, wherein fine temporal modification of the charge control signal (CHR) allows a desired amount of power to be extracted from the RF receive coil (246-x) coupled to the detune circuit (248-x). <EOS>