Apparatus for generating positive and negative supply rails from

Details Apparatus for generating positive and negative supply rails from Apparatus for generating positive and negative supply rails from

1993-05-14

1995-10-17

Pellinen, A. D.

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

363 17, 363 63, 363132, 318294, 3889072, 327531, 327108, H02M 704

Patent

active

054596548

ABSTRACT:
A motor control circuit is used to generate positive and negative voltage supply rails. The motor control circuit contains two halfbridges, each of which contains a pair of MOSFETs connected in series, each of the MOSFETs being formed without the customary short between the source and substrate (body). In one embodiment, a common node between the MOSFETs is connected to a positive voltage supply rail, and the body regions of the MOSFETs are connected to a negative voltage supply rail. The positive and negative voltage supply rails are biased by charging respective capacitors, using the positive and negative voltage spikes that appear at the outputs of the motor control circuit as the outputs switch from a low state to a high state, and vice versa.

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