| 主权项 |
1. An electronic direct current (DC) transformer apparatus for distributing off grid (DC power to one or more load devices, comprising:
a. an array of at least two unregulated DC to DC resonant converters separated at substantially equal phase displacements, each comprising:
i. an AC transformer with a primary, a secondary, and a leakage inductance and configured to be able to communicate with a source of off grid DC power,ii. a capacitor in series with the AC transformer,iii. a bridge of semiconductor switches configured to convert DC from a DC power source to AC at near resonance of the capacitor and the AC transformer leakage inductance, and to operate at a resonant frequency of at least 20 kilo Hertz (kHz) to achieve an unregulated energy-transfer efficiency of at least 75%, andiv. a current changing device between the AC transformer secondary and one or more load devices and configured to convert the current between AC and DC, and b. a single controller in communication with the array of resonant converters and configured to drive all resonant converters in the array at a resonant frequency that is the lowest used by any resonant converter in the array, to maintain substantially equal phase displacement between the resonant converters, and to convey DC power to one or more load devices with a power distributing efficiency from the source of off grid power to the load devices of at least 75%. |
