Circuit for generating two periodic signals having a controllable phase relationship therebetween
AssigneeReliance Electric Company
InventorsGary G. Siegmund, Robert J. Kretschmann
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Abstract
A circuit for generating at least two periodic output signals having a phase relationship controllable between zero and 180 degrees as a function of a d.c. control signal as compared to a ramp signal. Also included is circuitry for controlling the phase relationship to be at substantially 180 degrees when the d.c. control signal is always greater than the ramp signal and to be at substantially zero degrees when the d.c. control signal is always less than the ramp signal.
Claims19
A circuit for generating as a function of the amplitude of a d.c. control signal at least two periodic output signals having a phase relationship controllable between zero and 180 degrees, said circuit comprising:
- (a) oscillator means for generating a periodically recurring signal of predetermined frequency and waveform said signal having during each period a first portion of first predetermined amplitude and a second portion of second predetermined amplitude;
- (b) means responsive to said oscillator means signal for generating a periodically recurring signal having a ramp waveform said ramp starting each time said first portion of said oscillator signal begins;
- (c) means for comparing said ramp signal to said d.c. control signal said comparison means generating a signal having a first amplitude when said d.c. control signal exceeds said ramp signal and a second amplitude when said ramp signal exceeds said control signal;
- (d) first output means responsive to the beginning of said first portion of said oscillator signal for generating one of said periodic output signals;
- (e) means responsive to the periodic output signal generated by said first output means for generating a delayed version thereof;
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- (f) second output means responsive to said signal generated by said comparator means and said signal generated by said delay means for generating when said comparator means signal changes from said first amplitude to said second amplitude the other of said periodic output signals whereby the phase relationship between said periodic output signals is controlled as a function of said d.c. control signal to be between zero and 180 degrees.
A circuit for generating as a function of the amplitude of a d.c. control signal at least two periodic output signals having a phase relationship controllable between zero and 180 degrees, said circuit comprising:
- (a) oscillator means for generating a periodically recurring signal of predetermined frequency and waveform said signal having during each period a first portion of first predetermined amplitude and a second portion of second predetermined amplitude;
- (b) means responsive to said oscillator means signal for generating a periodically recurring signal having a ramp waveform said ramp starting each time said first portion of said oscillator signal begins;
- (c) means for comparing said ramp signal to said d.c. control signal said comparison means generating a signal having a first amplitude when said d.c. control signal exceeds said ramp signal and a second amplitude when said ramp signal exceeds said control signal;
- (d) first output means responsive to the beginning of said first portion of said oscillator signal for generating one of said periodic output signals and a signal identical to said one output signal said identical signal being at a fixed predetermined delay with respect to said one output signal;
- and
- (e) second output means responsive to said signal generated by said comparator means and said identical signal for generating when said comparator means signal changes from said first amplitude to said second amplitude the other of said periodic output signals whereby the phase relationship between said periodic output signals is controlled as a function of said d.c. control signal to be between zero and 180 degrees.
Dependencies are inferred from the claim text.