US 12,413,148 B2
Power efficient load current derived switch timing of switching resonant topology
Steven J. Geissler, Wellington, CO (US)
Assigned to Kaufman & Robinson, Inc., Fort Collins, CO (US)
Filed by Kaufman & Robinson, Inc., Fort Collins, CO (US)
Filed on Oct. 10, 2023, as Appl. No. 18/483,812.
Application 18/483,812 is a continuation in part of application No. 17/558,527, filed on Dec. 21, 2021, granted, now 11,823,867.
Claims priority of provisional application 63/191,158, filed on May 20, 2021.
Prior Publication US 2024/0039407 A1, Feb. 1, 2024
Int. Cl. H02M 3/158 (2006.01); H01J 37/32 (2006.01); H02M 1/08 (2006.01); H02M 1/088 (2006.01)
CPC H02M 3/158 (2013.01) [H01J 37/32174 (2013.01); H02M 1/083 (2013.01); H02M 1/088 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A processing system, the system comprising:
a power switching circuit configured to provide a power signal to a resonant load, wherein the power switching circuit is configured to switch a voltage of the power signal at a frequency of the resonant load, and wherein the power switching circuit begins switching the voltage before each zero voltage crossing of the resonant load; and
a current injector circuit configured to add an additional current to a load current controlled by the resonant load at least at each zero voltage crossing of the resonant load.
 
16. A method for providing power to a load, the method comprising:
applying an initial impulse input to a resonant load to cause the resonant load to resonate;
providing a power signal to the resonant load, wherein the power signal switches from a first voltage level to a second voltage level at a frequency corresponding to a frequency of the resonant load, and wherein the power signal includes a load current and a voltage controlled by the resonant load;
beginning a transition of the power signal from the first voltage level to the second voltage level prior to the voltage of the power signal crossing a zero voltage level; and
injecting an additional current, wherein the additional current is added to the load current when the voltage of the power signal crosses a zero voltage level.