A digitally controlled isolated power converter

• Main Authors: ANTHONY GERARD SCANLAN, MARK KEITH HALTON, MARTIN JOSEF SCHARRER
• Format: Patent
• Language: English
• Published: 19.08.2009
• Subjects: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS; CONTROL OR REGULATION THEREOF; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION

A digital SMPC (1) comprises an SMPS primary side (2}and an SMPS secondary side (3). Opto-couplers (4) perform bi-directional communication between primary side and secondary side communication circuits (5, 6). The primary side communication circuits (5) are connected via a loop controller (7) to the primary side (2). The secondary side communication circuits 6 are connected to the secondary side 3 via an ADC (8). The analogue-to-digital converter (ADC, "8) digitises the output voltage Vo on the secondary side. The secondary side communication module (6) encodes this value and uses the data couplers (4) to transmit it over the isolation barrier. The primary side communication module (5) receives and decodes the value and provides it to the loop controller module (7). The loop controller (7) is implemented as a Digital Signal Processor (DSP) or a hardware PID-controller. A Digital Pulse Width Modulator (DPWM) generates the switching signals for the primary stde power stage (2), which stabilizes the secondary side output voltage Vo.