Apparatus, method and system for control of ac/ac conversion
AssigneePower Offer Electronics Ltd.
InventorOfer Zilberberg
Life of this patent
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Abstract
A method, system and apparatus for controlling a pulse width modulator (PMW) converter for direct AC/AC conversion and/or AC voltage regulation. According to some embodiments of the invention, an output voltage may be provided, independent of the input voltage quality, thereby avoiding or minimizing power company irregularities, brownouts and the like. Embodiments of the present invention may be useful, for example, for use in connection with motors and motored devices or other applications.
Claims36
In a converter for converting an input alternating current (AC) signal to an output AC signal using synchronous pulse width modulation, an apparatus for providing switching signals to at least first and second converter switches, comprising:
- a selectable crossover module adapted to receive first and second input signals produced by a pulse width modulator, and to provide signals at first and second outputs to the first and second converter switches, the crossover module having first and second modes,
- wherein in the first mode, the first output of the crossover module is connected to provide the first input signal, and the second output is connected to provide the second input signal, and in the second mode, the first output of the crossover module is connected to provide the second input signal, and the first output is connected to provide the second input signal.
In a converter for converting an input alternating current (AC) signal to an output AC signal using synchronous pulse width modulation, an apparatus for providing switching signals to at least first and second converter switches, comprising:
- a selectable crossover module adapted to receive an input reference signal and provide an output signal to a pulse width modulation controller, the crossover module having first and second modes,
- wherein in the first mode, the output signal of the crossover module is connected to provide an output signal reference level proportional to said input reference level, and in the second mode, the first signal of the crossover module is connected to provide an output signal reference level inversely proportional to said input reference level.
In a converter for converting an input alternating current (AC) signal to an output AC signal using synchronous pulse width modulation, an apparatus for providing switching signals to at least first and second converter switches, comprising:
- a selectable crossover module adapted to receive an input reference signal and a ramp signal, and to provide signals at first and second outputs to a pulse width modulator, the crossover module having first and second modes,
- wherein in the first mode, the first output of the crossover module is connected to provide the input reference signal, and the second output is connected to provide the ramp signal, and in the second mode, the first output of the crossover module is connected to provide the ramp signal, and the first output is connected to provide the input reference signal.
A method of converting an input alternating current (AC) signal to an output AC signal using synchronous pulse width modulation comprising:
- receiving an input alternating current signal;
- producing a reference signal based on the level of the input signal;
- producing a pulse-width modulated signal based on the level of said reference signal;
- inverting the pulse width modulated signal, thereby producing a signal having an inverse duty cycle;
- and
- driving at least one switch using said pulse-width modulated signal, thereby producing said output signal.
A method of converting an input alternating current (AC) signal to an output AC signal using synchronous pulse width modulation comprising:
- receiving an input alternating current signal;
- producing a reference signal based on the level of the input signal;
- inverting the level of the reference signal;
- and
- producing a pulse-width modulated signal based on the level of said reference signal;
- and
- driving at least one switch using said pulse-width modulated signal, thereby producing said output signal.
Dependencies are inferred from the claim text.