Dual feedback loop DC-to-AC converter

Details Dual feedback loop DC-to-AC converter Dual feedback loop DC-to-AC converter

1990-10-18

1991-12-31

Wong, Peter S.

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

363 26, 363 41, 363 98, 363132, H02M 700

Patent

active

050776525

ABSTRACT:
Disclosed is a direct current (DC) to alternating current (AC) converter (5) that receives a direct current signal from an input power source (10) to drive a load (2). A power module (16), controlled by a central processing unit (CPU) (14), includes a DC-to-DC voltage booster (20) that boosts the direct current signal from approximately 12 volts to 150 volts. A DC-to-AC inverter (70), which is also controlled by the CPU, converts the boosted DC voltage from DC to a 60 Hz AC output signal (18) used to drive the load. The power module includes a voltage feedback path and a current feedback path for regulating the AC output voltage signal in response to changes in the load (12). The voltage feedback path includes a fast integrator (36) connected in parallel with a slow integrator (34). Should the voltage on a capacitor bank (22) fall below a predetermined minimum, the slow integrator is removed from the feedback path allowing the DC-to-DC voltage booster to provide more power, thereby quickly increasing the output AC voltage signal to compensate. Since the slow integrator normally remains in the voltage feedback path, the output AC voltage signal is regulated more slowly, thereby reducing the variation of current demanded from the input power source.

REFERENCES:
patent: 4788635 (1988-11-01), Heinrich
patent: 4814965 (1989-03-01), Peterson
patent: 4855652 (1989-08-01), Yamashita et al.
patent: 4864483 (1989-09-01), Divan
patent: 4879639 (1989-11-01), Tsukahara
patent: 4934822 (1990-06-01), Higaki
patent: 4937725 (1990-06-01), Dhyanchand

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