Charge pump with current mode output power throttling
AssigneeCirrus Logic, Inc.
InventorsEric J. King, Emmanuel Marchais
Life of this patent
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Abstract
A system may include a charge pump configured to boost an input voltage of the charge pump to an output voltage greater than the input voltage, a current mode control loop for current mode control of a power amplifier powered by the output voltage of the charge pump, and a controller configured to, in a current-limiting mode of the controller, control an output power of the charge pump to ensure that an input current of the charge pump is maintained below a current limit, control the power amplifier by placing the power amplifier into a high-impedance mode during the current-limiting mode, and control state variables of a loop filter of the current mode control loop during the current-limiting mode.
Claims12
A system comprising:
- a charge pump configured to boost an input voltage of the charge pump to an output voltage greater than the input voltage;
- a current mode control loop for current mode control of a power amplifier powered by the output voltage of the charge pump, wherein the current mode control loop is configured to minimize an error between a measured current through an output load of the power amplifier and a time-varying reference signal input to the current mode control loop to maintain the measured current in approximately constant proportion to the time-varying reference signal;
- and
- a controller configured to, in a current-limiting mode of the controller, attenuate the time-varying reference signal input to the current mode control loop.
A method comprising, in a current-limiting mode of a system comprising a charge pump configured to boost an input voltage of the charge pump to an output voltage greater than the input voltage and a current mode control loop for current mode control of a power amplifier powered by the output voltage of the charge pump, wherein the current mode control loop is configured to minimize an error between a measured current through an output load of the power amplifier and a time-varying reference signal input to the current mode control loop to maintain the measured current in approximately constant proportion to the time-varying reference signal, attenuating the time-varying reference signal input to the current mode control loop.
Dependencies are inferred from the claim text.