BUCK-BOOST DC/DC CONVERTER

A buck-boost DC/DC converter includes an inductor and a power stage (10) having a set of switches selectively connecting the inductor between a voltage input (Vin), a voltage output (Vout) and a reference level (Vref ) in accordance with buck or boost mode. The converter has a switch control block (...

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Bibliographische Detailangaben
Hauptverfasser:	BAYER, ERIC-JOHANN, PREXL, FRANZ, NEUHAEUSLER, JUERGEN
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	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
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Beschreibung
Zusammenfassung:	A buck-boost DC/DC converter includes an inductor and a power stage (10) having a set of switches selectively connecting the inductor between a voltage input (Vin), a voltage output (Vout) and a reference level (Vref ) in accordance with buck or boost mode. The converter has a switch control block (12) providing control signals to the set of switches in the power stage (10). A comparator block (14) provides to the switch control block (12) a first pulse width modulation signal in buck mode and a second pulse width modulation signal in boost mode. A ramp generator block (16) provides to the comparator block (14) a first ramp signal for buck mode and a second ramp signal for boost mode. An overlap control block (20) provides a ramp shift signal to the ramp generator (16) in response to a detection signal Whenever actuation of all switches in the power stage within the same clock period is detected, the ramp signals are adjusted in a sense to reduce the overlap between the ramp signals.