The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 04, 1979
Filed:
Jul. 28, 1978
Saburo Takaoka, Tokorozawa, JP;
Pioneer Electronic Corporation, Tokyo, JP;
Abstract
A speed-and-phase control circuit for a rotary machine. A frequency divider is responsive to an input signal whose frequency is proportional to the revolution number of the rotary machine. The frequency divider provides as a first output signal a frequency-divided version of the input signal. A logical circuit is responsive to the input signal and to the first output signal. The logical circuit provides in timed relationship first, second and third timing pulses. The pulse width of the first timing pulse and of the second timing pulse is equal to a half period of the input signal. The pulse width of the second timing pulse is equal to one period of the input signal. The rising edge of the first timing pulse is substantially coincident with the falling edge of the input signal, the rising edge of the second timing pulse is substantially coincident with the falling edge of the first timing pulse, and the rising edge of the third timing pulse is substantially coincident with the falling edge of the second timing pulse. A charging circuit charges a first capacitor to a predetermined voltage level in response to the first timing pulse. A discharge circuit discharges according to the constant current mode the first capacitor circuit in response to the second timing pulse. A first gate circuit transfers the charge present on the first capacitor circuit to a second capacitor circuit in response to the second timing pulse. A second gate circuit transfer the charge present on the first capacitor circuit to a third capacitor circuit in response to a reference pulse having a reference phase. The speed and phase of the rotary machine is selectively controlled in accordance with the voltages present on the second and third capacitor circuits.