초록 ▼

A power supply system that utilizes a plurality of inverter power supplies connect in common to drive a common load with control circuitry for forcing the power supplies to share the load equally is described. Control circuitry associated with each inverter power supply senses the current level prov

A power supply system that utilizes a plurality of inverter power supplies connect in common to drive a common load with control circuitry for forcing the power supplies to share the load equally is described. Control circuitry associated with each inverter power supply senses the current level provided to the load and compares to the average current provided by all other power supplies in the system. The control circuitry includes circuitry for controlling the pulse width modulator circuitry in response to the sensed condition that the power supply is supplying more than its equal share of the load and causes it to adjust the duty cycle of power switches in the power supply downward to reduce the output current level.

대표청구항 ▼

In a power supply for use with electronic equipment of the class having input means for coupling to a source of power; a plurality of power supply means coupled to said input means and each having output means coupled in common for providing current to common load; average output summing means for p

In a power supply for use with electronic equipment of the class having input means for coupling to a source of power; a plurality of power supply means coupled to said input means and each having output means coupled in common for providing current to common load; average output summing means for providing average output signals indicative of the average load current output of all of said power supply means to the load; a plurality of control circuit means each coupled to a respectively associated one of said plurality of power supply means for forcing said associated power supply to provide load current substantially equal to the load current provided by each of the other ones of said plurality of power supplies; wherein each of said plurality of power supply means includes power switch means capable of variable duty cycle operation for providing power signals to be utilized in determining said current to said common load pulse width modulation means coupled to said power switch means for adjusting said duty cycle in response to said control signals, thereby adjusting and controlling the level of said current supplied to said common load; and wherein each of said control circuit means includes power supply output level sensing means for providing output level signals indicative of the output level of the associated one of said power supply means to the common load, comparison means for comparing said output level signals to said average output signals for providing control signals when said output level signals have a predetermined relationship to said average output signals, and power supply adjustment means responsive to said control signals for adjusting the output level of the associated one of said power supply means in response thereto, thereby substantially equalizing the load current provided by each of said power supply means; said power supply output level sensing means includes current transformer means coupled to said power switch means for providing feedback current signals indicative of the load current supplied from said power switch means and peak average network means for integrating said current feedback signals and providing said output level signals as comparison voltage levels indicative of said feedback current levels; wherein said comparison means further comprises current error sense means coupled to said peak average network means and having average output receiving means for receiving said average output signals for providing error sense signals when said comparison voltage levels exceed said average output signals; and current error amplifier means coupled to said current error sense means for providing current error indicating signals indicative of the level of comparison of said output level signals to said average output signals in response to said error sense signals.