Control method of BUCK-BOOST converter

The invention belongs to the technical field of analog circuits, and particularly relates to a control method of a BUCK-BOOST converter. A small section of A+D conduction time is inserted before the A+C conduction stage of each period. And after the SW1 is charged to VIN and the reverse recovery tim...

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1. Verfasser:	XIE JIANZHANG
Format:	Patent
Sprache:	chi ; eng
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:	The invention belongs to the technical field of analog circuits, and particularly relates to a control method of a BUCK-BOOST converter. A small section of A+D conduction time is inserted before the A+C conduction stage of each period. And after the SW1 is charged to VIN and the reverse recovery time of the body diode of the switch B is over, the A+C conduction stage is entered. And the current in the switch A is always equal to the current in the inductor in the A+C conduction stage. The system does not need to shield a current sampling signal for a period of time, so that the minimum time of A+C conduction is reduced, and the ripple of inductive current is reduced. 本发明属于模拟电路技术领域，具体的说是涉及一种BUCK-BOOST变换器的控制方法。本发明在每个周期A+C导通阶段前插入一小段A+D导通时间。确保在将SW1充至VIN且开关B的体二极管反向恢复时间结束之后，再进入A+C导通阶段。在A+C导通阶段开关A中的电流一直等于电感中的电流。系统不再需要将电流采样信号屏蔽一段时间，从而减小了A+C导通的最小时间，降低了电感电流的纹波。