Pulsed power converter with multiple output voltages

• US 5,377,090 A
• Filed: 01/19/1993
• Issued: 12/27/1994
• Est. Priority Date: 01/19/1993
• Status: Expired due to Term

• Current Assignee: Lockheed Martin Corporation (Martin Marietta Corporation)
• Original Assignee: Martin Marietta Corporation
• Inventors: Steigerwald, Robert L.
• Primary Examiner(s): Stephan, Steven L.
• Assistant Examiner(s): BERHANE, ADOLF D
• Application Number:
  US08/005,952
• Time in Patent Office: 707 Days
• Field of Search: 363/20, 363/59, 363/131, 307/17, 307/18, 307/19, 307/20, 358/190, 315/411, 323/266, 323/267, 323/268, 323/350
• US Class Current: 363/20
• CPC Class Codes: H02M 3/33561 having more than one ouput with independent control

Abstract

A distributed power system for providing multiple output voltages, including pulsed voltages, to a solid-state phased-array radar transmit/receive module, for example, includes: an energy-storage capacitor for coupling to an input dc power source and for storing substantial energy at high voltage for supplying pulsed voltages at low voltage; at least one capacitance-multiplying converter, including first and second transformers with multiple secondary windings, for producing positive and negative voltages on buses internal to a power module; and a plurality of series regulators to obtain multiple positive and negative load voltages, including pulsed voltages, from the positive and negative bus voltages. Substantial energy storage is achieved within the power module; and, if even more energy storage is desired, an additional external energy-storage capacitor can be coupled to the input power leads, thereby being coupled in parallel with the energy-storage capacitor. Only two power pins are needed to supply the entire module.

Claims

1. A phased-array apparatus including plural TR modules, each TR module including at least an RF amplifier and controls, said apparatus comprising:

a two-conductor DC power bus carrying power at a particular voltage;

a plurality of power supply assemblages, each comprising a power module and an associated TR module;

each said TR module including at least first and second power input ports, and requiring for operation of said amplifier and controls at least first and second regulated voltages, respectively, at said first and second power input ports, and pulse loading at least said first regulated voltage;

each said power supply including;

(a) an energy storage capacitor including first and second electrodes, each of which is coupled to a different one of said two conductors of said DC power bus by a path lacking inductors;

(b) a first transformer with primary and secondary windings, the number of turns of said secondary winding of said first transformer being less than the number of turns of said primary winding of said first transformer by a predetermined ratio;

(c) a second transformer with primary and secondary windings, the number of turns of said secondary winding of said second transformer being less than the number of turns of said primary winding of said second transformer by said predetermined ratio;

(d) first controllable switching means coupled, by a path lacking inductors, to at least one of said first and second electrodes of said energy storage capacitor and to said primary winding of said first transformer, for controllably coupling said primary winding of said first transformer across said energy storage capacitor during those intervals in which said first switching means is in a first state, and for controllably decoupling said primary winding of said first transformer from said energy storage capacitor during those intervals in which said first controllable switching means is in a second state;

(e) second controllable switching means coupled, by a path lacking inductors, to at least one of said first and second electrodes of said energy storage capacitor and to said primary winding of said second transformer, for controllably coupling said primary winding of said second transformer across said energy storage capacitor during those intervals in which said second switching means is in said first state, and for controllably decoupling said primary winding of said second transformer from said energy storage capacitor during those intervals in which said second controllable switching means is in said second state;

(f) switch drive means coupled to said first and second switching means, for gating said first and second switching means mutually out-of-phase and with a 50% duty cycle;

(g) noise filtering capacitance means;

(h) first rectifying means coupled to said secondary winding of said first transformer and to said noise filtering capacitance means by a path lacking inductors, and poled for aiding in producing a first unregulated DC voltage across said noise filtering capacitance means during those intervals in which said primary winding of said first transformer is coupled across said energy storage capacitor by said first switching means in said first state;

(i) second rectifying means coupled to said secondary winding of said second transformer and to said noise filtering capacitance means by a path lacking inductors, and poled for aiding in producing said first unregulated DC voltage across said noise filtering capacitance means during those intervals in which said primary winding of said second transformer is coupled across said energy storage capacitor by said second switching means in said first state;

(j) first series voltage regulation means coupled to said noise suppressing capacitance means and to said first power input port of said TR module by a path lacking inductors, for generating said first regulated voltage at said first power input port of said TR module;

(k) second series voltage regulation means coupled to said noise suppressing capacitance means and to said second power input port of said TR module by a path lacking inductors, for generating said second regulated voltage at said second power input port of said TR module;

(l) whereby said first and second transformers are alternately coupled to said energy storage capacitor by said first and second switching means and said noise filtering capacitance means is continuously coupled by a capacitance multiplying turns ratio of one of said first and second transformers to said energy storage capacitor, and said pulse load of said TR module is supplied by said energy storage capacitor by way of that one of said first and second transformers currently coupled between said energy storage capacitor and said noise filtering capacitance means.

2. An apparatus according to claim 1, wherein:

each said TR module includes at least third and fourth power input ports, and requires for its operation at least third and fourth regulated voltages, respectively, at said first and second power input ports, which third and fourth regulated voltages are poled oppositely to said first regulated voltage; and

each of said first and second transformers includes a further secondary winding, and further comprising;

second noise filtering capacitance means;

third rectifying means coupled to said further secondary winding of said first transformer and to said second noise filtering capacitance means by a path lacking inductors, and poled for aiding in producing a second unregulated DC voltage, opposite to said first unregulated DC voltage, across said second noise filtering capacitance means during those intervals in which said primary winding of said first transformer is coupled across said energy storage capacitor by said first switching means in said first state;

fourth rectifying means coupled to said further secondary winding of said second transformer and to said second noise filtering capacitance means by a path lacking inductors, and poled for aiding in producing said second unregulated DC voltage across said second noise filtering capacitance means during those intervals in which said primary winding of said second transformer is coupled across said energy storage capacitor by said second switching means in said first state;

third series regulation means coupled to said second noise suppressing capacitance means and to said third power input port of said TR module by a path lacking inductors, for generating said third regulated voltage at said third power input port of said TR module;

fourth series regulation means coupled to said second noise suppressing capacitance means and to said fourth power input port of said TR module by a path lacking inductors, for generating said fourth regulated voltage at said fourth power input port of said TR module, whereby said four regulated voltages are applied to said TR module while drawing power from said two-conductor DC power bus only by way of said coupling of said energy storage capacitor electrodes coupled to said conductors of said DC power bus.