Inverter buffered H-bridges

Published:2013/6/27 21:14:00 Author:muriel | Keyword: Inverter buffered H-bridges | From:SeekIC

Two independently-developed, but very similar designs use a 74HC240's inverters to buffer inputs to a 4-transistor H-bridge. Wilf Rigter was first with his HC bridge: Over the course of several posts, Wilf had this to say about his design: Here is a smokeless design I will call HC-bridge because it combines the best features of the H bridge and CMOS motor drivers. It has forward, reverse, freewheel and brake modes. For low voltage applications (ie 1.5V or 2.4V), the HC-Bridge circuit can be further simplified by using direct transistor base drive (no base resistors), since the base current is limited by the HC output resistance. That baseresistorless design was used more recently in the uRover circuit.



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