High resolution pulse width modulation

Details High resolution pulse width modulation High resolution pulse width modulation

1989-04-21

1991-06-11

Shoop, Jr., William M.

Electricity: motive power systems

Positional servo systems

Pulse-width modulated power input to motor

363129, 91362, G05B 1128

Patent

active

050235354

ABSTRACT:
An electrohydraulic servo system in which a microprocessor-based controller directs a pulse width modulated control signal to a servo valve for controlling flow of hydraulic fluid therethrough. Duration of each half-cycle in the pulse width modulated control signal is separately controlled by selectively incrementing or decrementing duration of the half-cycle in increments of the microprocessor clock period. Signal transition is controlled by a timer interrupt in which time required to enter the interrupt routine is measured following generation of the interrupt, and further operation is delayed by a complementary time, so that control signal transition takes place a fixed preselected number of clock periods after generation of a timer interrupt. In this way, timer interrupt latency is eliminated, and resolution of the pulse width modulated signal is enhanced through individual duration control of the signal half-cycles while maintaining a fixed modulated signal period.

REFERENCES:
patent: 4456865 (1984-06-01), Robertson, Jr. et al.
patent: 4577269 (1986-03-01), Abbondanti
patent: 4757747 (1988-07-01), Blotter et al.

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