초록 ▼

A plurality of conventional, parallel a.c. to d.c. to a.c. to d.c. converters are driven by a common a.c. source supply current to a common load. Each of the converters includes a controller for a pulse width modulated chopper; the controller determines the amplitude of d.c. current at the output te

A plurality of conventional, parallel a.c. to d.c. to a.c. to d.c. converters are driven by a common a.c. source supply current to a common load. Each of the converters includes a controller for a pulse width modulated chopper; the controller determines the amplitude of d.c. current at the output terminals of the particular converter. Input terminals of each controller are responsive to the output voltage of the particular converter with which the controller is associated. A common controller for the controllers of the individual converters is responsive to the load voltage. The common controller varies the impedance of a single variable impedance connected in parallel to remote sense input terminals of the controller of each of the converters.

대표청구항 ▼

In combination, I. a plurality of power supplies, Pl . . . Pk . . . Pn, where n is an integer greater than 1 and k is selectively l . . . n, supply Pk being responsive to an a.c. source and supplying a d.c. current to a common d.c. load for the power supplies; supply Pk including: (1) power output t

In combination, I. a plurality of power supplies, Pl . . . Pk . . . Pn, where n is an integer greater than 1 and k is selectively l . . . n, supply Pk being responsive to an a.c. source and supplying a d.c. current to a common d.c. load for the power supplies; supply Pk including: (1) power output terminal means connected to supply the d.c. current to the d.c. load; (2) a controller for the amplitude of the d.c. current supplied by the power output terminal means of power supply Pk to the load, said controller including: (i) remote sense input terminal means across which a d.c. input voltage for the controller is derived; (ii) d.c. impedance means connected in series with the power output terminals of power supply Pk; (iii) a first source of d.c. reference voltage; (iv) a first comparison circuit connected to be responsive to the first reference voltage and the voltage across the remote sense input terminal means of supply Pk for deriving a first error signal having a magnitude indicative of the deviation of the first reference voltage from the voltage across the remote sense terminal means of supply Pk; and (v) means responsive to the first error signal for controlling the amplitude of the d.c. current supplied by power supply Pk to the load; II. a second source of d.c. reference voltage; III. a second comparison circuit connected to be responsive to the d.c. voltage across the load and the voltage of the second source for deriving a second error signal indicative of the deviation of the second reference voltage from the d.c. load voltage; and IV. a variable d.c. impedance connected so its value is responsive to the amplitude of the second error signal, said variable impedance having terminals connected in parallel across the sense input terminal means of the controllers of power supplies Pl . . . Pk . . . Pn, whereby a voltage is developed across the remote sense input terminal means of the controller for supply Pk in response to the current flowing to the remote sense terminal means of the controller for supply Pk from the load terminal means of supply Pk and the variable impedance, said developed voltage causing the current supplied by power supply Pk to the load to be approximately equal to the current supplied by each of power supplies P1 . . . Pn.