Electric power conversion systems – Current conversion – With condition responsive means to control the output...
Patent
1992-12-04
1994-12-06
Sterrett, Jeffrey L.
Electric power conversion systems
Current conversion
With condition responsive means to control the output...
363 17, 363 41, 363132, H02M 75387
Patent
active
053716663
ABSTRACT:
A current mode control apparatus generates an AC power output from a DC input source. The apparatus includes a pulse width modulator (PWM) to produce gate drive signals for driving a power output section having an output inductor and connected across the DC input source. An inner current error control loop coupled between the AC power output and the PWM, controls the average current in the output inductor by generating a current error signal for inputting to the PWM for conversion to the gate drive signals. The current error signal is the difference between the average current and a voltage controlled input signal. An outer voltage error control loop coupled between the AC power output and the inner current error control loop generates a voltage error signal based on the difference between the AC power output and a reference AC voltage. The voltage error signal represents a change in demand for current in the output inductor and serves as the voltage controlled input signal to the inner current error control loop. A voltage limiter in the outer voltage error control loop limits the voltage error signal to a maximum value to prevent the average current in said output inductor and thus in said AC power output from exceeding a predetermined limit. The current mode control apparatus is adaptable for use in an uninterruptible power supply for supplying a load with the AC power output.
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Microcontroller Application in an Uninterruptible Power Supply by Thomas E. Helfrich-his master's thesis which was submitted to West Coast University on Apr. 11, 1991.
Femal Michael J.
Golden Larry I.
Graefe Richard J.
Square D Company
Sterrett Jeffrey L.
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