Current sharing modular power supply

Details Current sharing modular power supply Current sharing modular power supply

1989-01-03

1990-05-08

Beha, Jr., William H.

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

323285, 363 71, H02M 3158

Patent

active

049241702

ABSTRACT:
A regulator circuit for equalizing the load currents of a plurality of power supply modules connected in common to feed a common load. Each of the modules includes a pulse-width modulator for adjusting the duty cycle of the module, thereby to adjust the voltage regulation point and corresponding current output of the module. A current sensor produces a current level signal proportional to the current output of the module. The current level signal is applied through a current amplifier to generate a corresponding variable error voltage. A fixed reference voltage derived from the output voltage and the variable error voltage are applied to the pulse-width modulator to vary the duty cycle so as to produce a decrease in load voltage with an increase in current output and an increase in the load voltage with a decrease in current output thereby equalizing the current output of the module with modules having substantially equal output voltages. A low pass filter interposed in the regulator feedback path assures current sharing under quasi steady-state conditions without degradation of high frequency response to dynamic load changes.

REFERENCES:
patent: 4194147 (1980-03-01), Payne et al.
patent: 4257090 (1981-03-01), Kroger
patent: 4309650 (1982-01-01), Boros et al.
patent: 4371919 (1983-02-01), Andrews
patent: 4635178 (1987-01-01), Greenhalgh
patent: 4672518 (1987-06-01), Murdock
patent: 4766364 (1988-08-01), Biamonte et al.
Azzis et al, "Parallel Identical Direct-Mode DC-DC Converters", IBM Tech. Discl. Bul., vol. 25, No. 2, pp, 624, 625, Jul. 1982.

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