Patent Number:
6,310,912
Title:
System for increasing the definition in converting a digital datum in a PWM signal for driving a full-bridge output stage
Abstract:
The definition of conversion of a digital value in a PWM signal using an N-bit up/down counter is improved by increasing the dimension of the input data to N+2 bits. This is done using the two Lsb's of the N+2 input data for selecting one among three intermediate levels between two consecutive values of an N-bit dynamic, according to a predefined table of combinations. The converter may still use an N-bit comparator. The system is particularly useful in driving a multi-phase brushless DC motor with each phase-winding singularly driven through a full-bridge output stage.
Inventors:
Maiocchi; Giuseppe (Villa Guardia, IT), Galbiati; Ezio (Agnadello, IT)
Assignee:
STMicroelectronics S.r.l.
International Classification:
H02M 7/5387 (20060101); H03M 1/82 (20060101); H03K 009/08 ()
Expiration Date:
10/30/2018