Motor drive circuit

Details Motor drive circuit Motor drive circuit

2006-05-31

2010-12-14

Ro, Bentsu (Department: 2837)

Electricity: motive power systems

Positional servo systems

With particular motor control system responsive to the...

C318S400120, C318S400200, C318S599000

Reexamination Certificate

active

07852035

ABSTRACT:
To provide a motor driving circuit and a motor driving system wherein the circuit occupation area is small and the IC size can be reduced.A polarity inversion data generating circuit is provided to use the higher-order bits of an address counter, which do not contribute to the access to a memory, as they are, as polarity inversion instruction data (flag bit). Then, two cyclic memory accesses are performed in the same direction to read a half period of waveform data twice. A polarity inversion instruction is issued for one of the waveform data as read twice. A calculation of the polarity inversion is performed in accordance with the polarity inversion instruction, whereby waveform data corresponding to one period of sinusoidal wave can be simply generated.

REFERENCES:
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patent: 4636928 (1987-01-01), Deguchi et al.
patent: 4651079 (1987-03-01), Wills
patent: 5386182 (1995-01-01), Nikami
patent: 5444340 (1995-08-01), Tamaki et al.
patent: 3-265499 (1991-11-01), None
patent: 7-67391 (1995-03-01), None
patent: 2003-180095 (2003-06-01), None

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