Digital switched mode voltage regulator

摘要

The present invention relates to a switched mode voltage regulator circuit comprising a regulation loop coupled between the output voltage of the regulator and a switch driver. The regulation loop comprising an error signal generator supplying a digital error signal representative of a voltage difference between the output voltage and a reference voltage. The regulation loop further comprises a linear digital filter and a non-linear digital filter both coupled for receipt of the digital error signal and a digital summer coupled for receipt of linearly and non-linearly filtered digital error signals to provide a combined digital error signal. A digital pulse modulator is configured to generate the pulse width or pulse density modulated driver control signal in accordance with the combined digital error signal.

主权项

1. A switched mode voltage regulator circuit comprising:
an input terminal for receipt of a regulator input voltage, an output terminal for supply of an output voltage, a power supply block configured for energy charging from the regulator input voltage in a first regulator mode and for discharge of stored energy to the output voltage in a second regulator mode, a driver configured to supply pulse control signals to control the regulator modes of the power supply block, and a regulation loop coupled between the output voltage and the driver, the regulation loop comprising: an error signal generator operatively coupled to one of the output voltage and a reference voltage and configured to supply a digital error signal representative of a voltage difference between the output voltage and the reference voltage, a linear digital filter coupled for receipt of the digital error signal to provide a linearly filtered digital error signal, a non-linear digital filter coupled for receipt of the digital error signal to provide a non-linearly filtered digital error signal, a digital summer coupled for receipt of the linearly and the non-linearly filtered digital error signals to provide a combined digital error signal, and a digital pulse modulator configured to modulate the combined digital error signal.