초록 ▼

An inverter/converter power supply system that employs pulse-width modulation controlled by an absolute-value representation of a reference wave. A low-frequency wave, such as a 60 hertz sine wave, is precision-rectified which then is the reference input of a pulse-width modulation controller (PWM).

An inverter/converter power supply system that employs pulse-width modulation controlled by an absolute-value representation of a reference wave. A low-frequency wave, such as a 60 hertz sine wave, is precision-rectified which then is the reference input of a pulse-width modulation controller (PWM). The PWM then produces a high-frequency square-wave signal whose pulse width changes as the amplitude of the rectified reference wave changes. The high-frequency square-wave signal is further rectified at an inverter/converter transformer secondary, whose output is filtered through a low-pass filter that removes the high-frequency component while minimizing the stored charge in the filter capacitor(s) to an amount easily drained by a small constant-current load across it. Feedback from the constant-current load to the PWM further adjusts the pulse-width to compensate for load variations and circuit losses. A flip-flop matrix of transistors then converts the pulsating DC wave signal to an AC wave signal by inverting the polarity on every other half wave cycle.

대표청구항 ▼

A switching-mode AC wave replication system comprising: (a) a rectifier for converting a low-frequency, low-voltage AC reference signal applied thereto into a low-voltage DC signal and transmitting said low-voltage DC Signal into a pulse-width modulator and a zero crossing detector and matrix contro

A switching-mode AC wave replication system comprising: (a) a rectifier for converting a low-frequency, low-voltage AC reference signal applied thereto into a low-voltage DC signal and transmitting said low-voltage DC Signal into a pulse-width modulator and a zero crossing detector and matrix controller; (b) said pulse-width modulator for varying the pulse-width of a DC power source into a pulsed DC signal and transmitting said pulsed DC signal into a transformer; (c) said transformer converting said pulsed DC signal into a high-frequency, high-voltage AC signal, and transmitting said high-frequency, high-voltage AC signal into a full-wave bridge rectifier; (d) said bridge rectifier converting said high-frequency, high-voltage AC signal into a high-voltage DC signal, and transmitting said high-voltage DC signal to a filter; (e) said filter converting said high-voltage DC signal into a filtered high-voltage DC signal and transmitting said filtered high-voltage DC signal to a feedback circuit, a constant-current load;, and to a matrix of high-voltage transistors; (f) said feedback circuit transmitting said filtered high-voltage DC signal back to said pulse-width modulator; (g) said pulse-width modulator adjusting the pulse width of said dc power source in response to said low-voltage DC signal from said rectifier and said filtered high-voltage DC signal from said feedback circuit; (h) said matrix having connections with said zero crossing detector and matrix controller and converting said filtered high-voltage DC signal into a low-frequency, high-voltage AC signal having a wave-shape substantially replicating the wave-shape of said reference signal; and (I) said controller having connections for receiving said reference signal and means for detecting when said wave-shape of said reference signal is above and below a zero value, and sending control signals to said matrix in response to said detection means.