PWM circuit

Details PWM circuit PWM circuit

1988-08-31

1990-03-20

Shoop, Jr., William M.

Electricity: motive power systems

Positional servo systems

Pulse-width modulated power input to motor

363 41, 388804, 388811, 318254, G05B 1128

Patent

active

049104489

ABSTRACT:
A PWM circuit for generating a PWM wave which is pulse-width modulated in response to binary information and is used for a signal such as a motor driving signal in an R-DAT (rotary head type digital audio tape recorder) comprises a circuit for dividing binary information such as a motor speed error signal provided for generating a PWM wave into plural bit groups and generates PWM waves corresponding to numerical values of these plural bit groups, and a circuit for weighting the generated PWM waves in an analog manner at a ratio corresponding to orders of the respective bit groups and adding the weighted PWM waves. Since binary information is divided into plural bit groups, the bit number of each bit group is small so that the period of PWM wave can be shortened without reducing the quantization bit number of the binary information or shortening reference clock period whereby accuracy of an error signal can be improved when the invention is applied to, e.g., a motor drive device.

REFERENCES:
patent: 4243921 (1981-01-01), Tamura et al.
patent: 4249119 (1981-02-01), Robbi
patent: 4500822 (1985-02-01), Tajima et al.

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