Power conversion apparatus and system therefor

Claim 2

Power conversion apparatus for converting a high frequency Signal to a relatively low frequency or controlled d.c. output signal comprising: an SCR bridge rectifier; means for applying two junctions of said bridge with a two phase high frequency signal; control means for controlling the firing of said SCR''s to convert said high frequency signal to a low frequency signal, said control means including means for integrating said high frequency signal, means for providing a first reference signal, and comparator means responsive to said integrated signal and said first reference signal for firing said SCR''s in predetermined order; and means coupled to the other two junctions of said bridge for coupling the low frequency signal to a load, said means including an autotransformer for immunizing the magnitude of the low frequency output signal against changes in load current.

Claim 3

Apparatus as in claim 1 wherein said autotransformer includes two ends and a center tap such ends being coupled to said other two junctions of said bridge and said center tap being adapted to couple to the load.

Claim 4

Apparatus as in claim 1 where said means for supplying said two junctions of said bridge with a two phase high frequency signal includes an autotransformer having a center tap referenced to a common with the load with two taps symmetrical with the center tap coupled to said high frequency signal and two taps symmetrical with the center tap coupled to such two junctions.

Claim 5

Apparatus as in claim 1 where said means for supplying said two junctions of said bridges with a two phase high frequency signal includes a transformer with its primary winding coupled to said high freuqency signal, its secondary winding coupled to such two junctions said secondary winding having a center tap referenced to a common with the load.

Claim 6

Power conversion apparatus for converting a high frequency signal to a relatively low frequency or controlled d.c. output signal comprising: an SCR bridge rectifier; means for supplying two junctions of said bridge with a two phase high frequency signal; control means for controlling the firing of said SCR''s to convert said high frequency signal to a low frequency signal, said control means including means for integrating said high frequency signal, means for providing a first reference signal, and comparator means responsive to said integrated signal and said first reference signal for firing said SCR''s in a predetermined order; means coupled to the other two junctions of said bridge for coupling the low frequency signal to a load, said means including an autotransformer for immunizing the magnitude of the low frequency output signal against changes in load current; and second reference signal means coupled to said comparator means for maintaining a predetermined current and flux level in said autotransformer.

Claim 7

Power conversion apparatus for converting a high frequency signal to a relatively low frequency or controlled d.c. output signal comprising: an SCR bridge rectifier; means for supplying two junctions of said bridge with a two phase high frequency signal; control means for controlling the firing of said SCR''s to convert said high frequency signal to a low frequency signal, said control means including means for integrating said high frequency signal, means for providing a first reference signal, and comparator means responsive to said integrated signal and said first reference signal for firing said SCR''s in a predetermined order; means coupled to the other two junctions of said bridge for coupling the low frequency signal to a load, said means including an autotransformer for immunizing the magnitude of the low frequency output signal against changes in load current; and second reference signal means coupled to said comparator means for maintaining a predetermined current and flux level in said autotransformer.

Claim 8

Apparatus as in claim 5 where said autotransformer has first and second branch currents and where said second reference means includes means for sensing and summing said branch currents which sum is equal to said predetermined current and differential amplifier means responsive to any difference between said summed currents and a reference current of said reference means for causing a shift in the comparison level of said comparator means.

Claim 9

Apparatus as in claim 6 together with overload limit means coupled to said first reference signal means and responsive to said first and second branch currents for limiting said first reference signal.

Claim 10

Appparatus as in claim 5 wherein said means for providing said first reference signal includes means for providing both d.c. reference signals and a.c. reference signals of several different frequencies.

Claim 11

Apparatus as in claim 1 together with means for filtering said low frequency signal said filtering means including an inductor.

Claim 12

Apparatus as in claim 1 together with means for filtering said low frequency signal said filtering means including an inductor and a capacitor.

Claim 13

A control system for firing the control devices of a full wave rectifier circuit which converts a high frequency input signal to a relatively low frequency or controlled d.c. output signal comprising: means for integrating said high frequency signal; means for providing a first reference signal; comparator means responsive to said integrated signal and said reference signal for firing said control devices in a predetermined order; and means providing a second reference signal, said comparator means responsive to said second reference signal to maintain a predetermined circulating current in said rectifier circuit.

Claim 14

A control system for firing the control devices of a full wave rectifier circuit which converts a high frequency input signal to a relatively low frequency or controlled d.c. output signal comprising: means for integrating said high frequency signal; means for providing a first reference signal; comparator means responsive to said integrated signal and said reference signal for firing said control devices in a predetermined order; and means providing a second reference signal, said comparator means responsive to said second reference signal to maintain a predetermined circulating current in said rectifier circuit.

Claim 15

A control system for firing the control devices of an inverter circuit which produces a relatively low frequency or controlled d.c. output signal comprising: means for integrating the inverter''s d.c. input signal to obtain an integrated signal; means for periodically inverting and resetting the integrated signal; means for providing a reference signal; and comparator means responsive to said reference signal and said integrated signal for activating said control devices in a predetermined order.

Claim 16

A control system for firing the control devices of an inverter circuit which produces a relatively low frequency or controlled d.c. output signal comprising: means for integrating the inverter''s d.c. input signal to obtain an integrated signal; means for periodically inverting and resetting the integrated signal; means for providing a reference signal; and comparator means responsive to said reference signal and said integrated signal for activating said control devices in a predetermined order.