Power supply circuitry and adaptive transient control

摘要

A control circuitry can be configured to receive an error signal indicating a difference between an output voltage of the power supply and a desired setpoint for the output voltage. According to one configuration, depending on the error signal, the control circuitry initiates switching between operating the control circuitry in a pulse width modulation mode and operating the control circuitry in a pulse frequency modulation mode to produce an output voltage. Operation of the control circuitry in the pulse frequency modulation mode during a transient condition, such as when a dynamic load instantaneously requires a different amount of current, enables the power supply to satisfy current consumption by the dynamic load. Subsequent to the transient condition, the control circuitry switches back to operation in the pulse width modulation mode.

主权项

1. A method comprising:
via control circuitry in a power supply:
receiving an error signal, the error signal indicating a difference between an output voltage of the power supply and a desired setpoint for the output voltage;monitoring a slope of the error signal; anddepending on the slope of the error signal, switching between:
operating the control circuitry in a pulse width modulation mode to produce the output voltage, andoperating the control circuitry in a pulse frequency modulation mode to produce the output voltage; the method further comprising:
analyzing both the slope of the error signal and a magnitude of the error signal;switching from the pulse width modulation mode to the pulse frequency modulation mode depending on the slope of the error signal and the magnitude of the error signal; andswitching from the frequency modulation mode to the pulse width modulation mode depending at least in part on a change in polarity of the error signal.