DC-to-DC switching power supply utilizing a delta-sigma converter in a closed loop controller

摘要

A DC-to-DC switching power supply (12) receives a DC biased power signal at a first input (14), a control signal at its control input (16) and produces an output DC voltage at its output terminal (20). A power supply controller (30) compares the produced output signal Vout with an input reference signal Vref. The reference signal is an analog signal which may be produced via digital-to-analog converter (34) which converts a digital input command into a corresponding analog signal Vref. The resulting error signal is then passed through a proportional gain block 36 and an integral gain block (38). A signal proportional to the differential of the output voltage is passed through a differential gain block (44). The outputs from the proportional gain block (36) integrator gain block (38) differential gain block (44) are summed in the second summer (40) and applied as the input to a delta-sigma converter (42). The output from delta-sigma (42) then constitutes a fixed-width pulse stream of predetermined sequence such that, when applied to the control input (16) of the switching power supply (12), the power supply produces a DC output signal Vout at its output terminal (20) which is determined by the reference signal Vref.