A Novel Δ∑ Modulation Processing Circuit suitable for Switched Mode DC-DC Converter Application

Abstract

In recent years, the authors have proposed that Δ∑ modulation signal processing circuit is effectively applied for an inverter system with a PWM pulse pattern generating scheme. But if Δ∑ modulation processing circuit is applied to switching mode DC-DC converter, the major advantageous feature of spread spectrum characteristic disappears. In this paper, the authors propose a novel Δ∑ modulation circuit suitable for switched mode DC-DC converter application. In addition to this, there is the feature of automatic amplitude control scheme for this converter treated here. From the simulation results, unnecessary signals out of signal frequency band are much reduced and the voltage fluctuations of input side DC supply are minimized at the output side of the converter. Furthermore, the system design simplification can be achieved for the Δ∑ modulated converter system.