Resonant circuit and resonant dc/dc converter

Abstract

The present disclosure relates to a resonant circuit ( 20 ). The resonant circuit comprises three resonant circuit input nodes ( 11, 12, 13 ) and three resonant circuit output nodes ( 21, 22, 23 ), a transformer device and resonant tank devices. The transformer device (TR) comprises three primary windings (LP 1, LP 2, LP 3 ) and three secondary windings (LS 1, LS 2, LS 3 ) magnetically connected to each other, where the three secondary windings (LS 1, LS 2, LS 3 ) are connected to the three resonant circuit output nodes ( 21, 22, 23 ). The first, second and third resonant tank devices (RT 1, RT 2, RT 3 ) are each connected between the respective three resonant circuit input nodes ( 11, 12, 13 ) and the respective primary windings (LP 1, LP 2, LP 3 ). The disclosure also relates to a resonant DC-DC converter comprising such a resonant circuit ( 20 ).

1 . A resonant circuit comprising:
 a first resonant circuit input node, a second resonant circuit input node, and a third resonant circuit input node;   a first resonant circuit output node, a second resonant circuit output node, and a third resonant circuit output node;
 a transformer device comprising:
 a first primary winding, a second primary winding, and a third primary winding; 
 a first secondary winding, a second secondary winding, and a third secondary winding, 
 wherein the first, second, and third primary windings are magnetically connected to the first, second, and third secondary windings each other, and 
 wherein the first, second, and third secondary windings are connected to the first, second, and third resonant circuit output nodes; 
 
   a first resonant tank device, a second resonant tank device, and a third resonant tank device each connected between the respective resonant circuit input nodes and the respective primary windings; and
 a first transformer switching device, a second transformer switching device, and a third transformer switching device arranged to reconfigure the first, second, and third secondary windings between a delta-configuration and a star-configuration, 
   wherein the first, second, and third primary windings together with the first, second, and third resonant tank devices are configured in the delta-configuration.   
     
     
         2 . The resonant circuit according to  claim 1 , wherein each resonant tank device comprises a resonant inductor and a resonant capacitor. 
     
     
         3 . (canceled) 
     
     
         4 . (canceled) 
     
     
         5 . (canceled) 
     
     
         6 . The resonant circuit according to  claim 2 , wherein:
 the resonant inductor of the first resonant tank device, the resonant capacitor of the first resonant tank device, and the first primary winding are connected in series between the first resonant circuit input node and the third resonant circuit input node,   the resonant inductor of the second resonant tank device, the resonant capacitor of the second resonant tank device, and the second primary winding are connected in series between the second resonant circuit input node and the first resonant circuit input node, and   the resonant inductor of the third resonant tank device, the resonant capacitor of the third resonant tank device, and the third primary winding are connected in series between the third resonant circuit input node and the second resonant circuit input node.   
     
     
         7 . The resonant circuit according to  claim 2 , wherein a magnetic inductor is connected in parallel with each of the primary windings. 
     
     
         8 . The resonant circuit according to  claim 2 , wherein:
 the resonant inductor of the first resonant tank device, the resonant capacitor of the first resonant tank device, and the first primary winding are connected in series between the first resonant circuit input node and a primary common node,   the resonant inductor of the second resonant tank device, the resonant capacitor of the second resonant tank device, and the second primary winding are connected in series between the second resonant circuit input node and the primary common node, and   the resonant inductor of the third resonant tank device, the resonant capacitor of the third resonant tank device, and the third primary winding are connected in series between the third resonant circuit input node and the primary common node.   
     
     
         9 . A resonant DC-DC converter comprising:
 a first input terminal and a second input terminal;   a first output terminal and a second output terminal;   a switching device connected between the first and second input terminals and a first resonant circuit input node, a second resonant circuit input node, and a third resonant circuit input node of a resonant circuit;   a rectifier device connected between a first resonant circuit output node, a second resonant circuit output node, and a third resonant circuit output node and the first and second output terminals,   wherein the resonant circuit comprises a transformer device comprising:
 a first primary winding, a second primary winding, and a third primary winding; 
 a first secondary winding, a second secondary winding, and a third secondary winding, 
 wherein the first, second, and third primary windings are magnetically connected to the first, second, and third secondary windings, wherein the the first, second, and third secondary windings are connected to the first, second, and third resonant circuit output nodes, 
   wherein the resonant circuit comprises a first resonant tank device, a second resonant tank device, and a third resonant tank device each connected between the respective first, second, and third resonant circuit input nodes and the respective first, second, and third primary windings, and   wherein the resonant circuit comprises a first transformer switching device, a second transformer switching device, and a third transformer switching device arranged to reconfigure the first, second, and third secondary windings between a delta-configuration and a star-configuration and the first, second, and third primary windings are configured in a delta-configuration.   
     
     
         10 . The converter according to  claim 9 , wherein each resonant tank device comprises a resonant inductor and a resonant capacitor. 
     
     
         11 . (canceled) 
     
     
         12 . (canceled) 
     
     
         13 . The converter according to  claim 9 , wherein the switching device comprises six switching devices, wherein each switching device is connected between one of the first or second input terminals and one of the respective switch output nodes. 
     
     
         14 . The converter according to  claim 9 , wherein the rectifier device is a diode rectifier or a synchronous rectifier. 
     
     
         15 . The converter according to  claim 10 , wherein the switching device comprises six switching devices, wherein each switching device is connected between one of the first or second input terminals and one of the respective switch output nodes. 
     
     
         16 . The converter according to  claim 10 , wherein the rectifier device is a diode rectifier or a synchronous rectifier. 
     
     
         17 . The converter according to  claim 13 , wherein the rectifier device is a diode rectifier or a synchronous rectifier.