Programmable multiple phase AC power supply
First Claim
1. An oscillator for an AC power supply comprising:
- means for generating a clock signal having a selectively controllable pulse repetition rate;
a memory storing a binary representation of a quarter-cycle sinusoidal waveform segment at a plurality of sequential memory locations;
an address counter responsive to said clock signal and operable for developing output address signals for sequentially addressing the memory locations of said memory in a forward direction and in a reverse direction;
control means responsive to said address signals for operating said address counter for alternately addressing the entire contents of said memory in a forward direction and in a reverse direction for causing said memory to output a continuous sequence of half-cycle sinusoidal waveform segments; and
output means responsive to said control means for inverting every other one of the half-cycle sinusoidal waveform segments developed by said memory, whereby a periodic sinusoidal output signal is produced.
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Accused Products
Abstract
A variable frequency oscillator for an AC power supply having programmable, multiple phase outputs comprises means including a rate multiplier for generating a clock signal having a selectively controllable frequency and one or more AC signal producing stages responsive thereto. Each AC signal producing stage includes a memory storing a quarter-cycle sinusoidal waveform segment in amplitude sampled form and an address counter responsive to the clock signal for alternately addressing the memory in forward and reverse directions for producing a continuous sequence of half-cycle sinusoidal segments, an output circuit inverting every other one of the half-cycle segments. A first one of the stages produces an output signal having a reference phase angle while the remaining stages are operated such that their associated address counters are offset from the address counter of the first stage by an amount corresponding to an input phase control code, whereby the remaining stages produce output signals having phase angles corresponding displaced from the reference phase angle.
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Citations
15 Claims
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1. An oscillator for an AC power supply comprising:
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means for generating a clock signal having a selectively controllable pulse repetition rate; a memory storing a binary representation of a quarter-cycle sinusoidal waveform segment at a plurality of sequential memory locations; an address counter responsive to said clock signal and operable for developing output address signals for sequentially addressing the memory locations of said memory in a forward direction and in a reverse direction; control means responsive to said address signals for operating said address counter for alternately addressing the entire contents of said memory in a forward direction and in a reverse direction for causing said memory to output a continuous sequence of half-cycle sinusoidal waveform segments; and output means responsive to said control means for inverting every other one of the half-cycle sinusoidal waveform segments developed by said memory, whereby a periodic sinusoidal output signal is produced. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A power source oscillator for generating a plurality of AC signals each having the same frequency and a different phase angle comprising:
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means for generating a clock signal having a selectively controllable frequency; a first AC signal producing stage including a binary memory sequentially storing a quarter-cycle sinusoidal waveform segment in amplitude sampled form, means responsive to said clock signal for developing output address signals for alternately addressing said binary memory in a forward direction and in a reverse direction for causing said memory to output a continuous sequence of half-cycle sinusoidal waveform segments and output means responsive to said means for addressing for inverting every other one of said half-cycle sinusoidal segments for producing a periodic output sinusoidal signal having a reference phase angle, and a second one of said AC signal producing stages including means responsive to said first stage for selectively offsetting the address signals of said first stage relative to the address signals of said second stage for causing the AC signal developed by the output means of said second stage to be characterized by a phase angle differing from said reference phase angle by an amount corresponding to said offset. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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Specification