Multiplexing A/D converter for a generator control unit

Details Multiplexing A/D converter for a generator control unit Multiplexing A/D converter for a generator control unit

1989-12-22

1991-08-27

Lall, Parshotam S.

Boots, shoes, and leggings

364132, 364134, G06F 1520

Patent

active

050439111

ABSTRACT:
A "reversible master/slave" handshaking protocol is disclosed for addressing the problem of interfacing a multiplexing analog-to-digital (A/D) converter, having a first operating rate, to a microprocessor, having a second operating rate. In the specific embodiment of a generator control unit (GCU) for an electrical power generating system, an analog multiplexer (124), an A/D converter (126), and a dual-port RAM (130) are controlled by an A/D controller (134) to provide data words to a voltage regulator processor (92). If a fast A/D converter is used, then the A/D controlling system will multiplex and convert samples from all of the analog input signals, load the RAM, and wait for the processor to read the RAM. If the A/D conversion rate is slow, the A/D controller will continuously sample all the multiplexed channels, while the processor waits for the appropriate channel information to be loaded into the RAM. In this manner, data acquisition can be perform utilizing A/D converters having various conversion rates, multiplexers having additional channels, or microprocessors having numerous feedback control loops.

REFERENCES:
patent: 4032757 (1977-06-01), Eccles
patent: 4258545 (1981-03-01), Slater
patent: 4730256 (1988-03-01), Niimi et al.
patent: 4740883 (1988-04-01), McCollum
patent: 4803618 (1989-02-01), Ita et al.

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