Method and device for controlling a multiphase resonant DC/DC converter, and corresponding multiphase converter
A method for controlling a multiphase resonant DC/DC converter comprising a plurality of identical elementary resonant DC/DC converters connected in parallel. The method comprises the steps of measuring each of the supply currents (I R1 , I R2 , . . . I Rn ) of the elementary converters for balancing the supply currents (I R1 , I R2 , . . . I Rn ) and controlling switching frequencies (F 1 , F 2 , . . . F n ) of the elementary converters according to the supply currents (I R1 , I R2 , . . . I Rn ), so as to carry out the balancing. The supply currents (I R1 , I R2 , . . . I Rn ) are measured in the elementary DC/DC converters in order to balance these same currents.
1. A method for controlling a multiphase resonant DC/DC converter comprising a plurality of identical elementary resonant DC/DC converters connected in parallel and provided with supply currents (I R1 , I R2 , . . . I Rn ) the method comprising the steps of:
measuring each of the supply currents (I R1 , I R2 , . . . I Rn ) of the elementary converters for balancing the supply currents (I R1 , I R2 , . . . I Rn );
controlling switching frequencies (F 1 , F 2 , . . . F n ) of the elementary converters according to the supply currents (I R1 , I R2 , . . . I Rn ), so as to carry out the balancing; and
setting the supply currents (I R1 , I R2 , . . . I Rn ) to a common reference intensity (Iref) which is determined according to a difference between an output voltage (Vo) of the multiphase converter and a nominal voltage (Vref).
2. The method according to claim 1 , wherein the supply currents (IR 1 , IR 2 , . . . IRn) are determined by measuring differences of potential (VR 1 , VR 2 , . . . VRn) at terminals of shunts ( 12 ) inserted in series in supply circuits of the elementary converters.
3. The method according to claim 1 , wherein the switching frequencies (F 1 , F 2 , Fn) are derived from a voltage-frequency conversion ( 21 ).
4. A device for controlling the multiphase resonant DC/DC converter, the device comprising an intensity measurement device for each of the supply currents (I R1 , I R2 , . . .I Rn ) of the elementary converters for balancing the supply currents (I R1 , I R2 , . . . I Rn ), and configured to implement the method according to claim 1 , wherein the device further comprises frequency generators ( 21 ) which generate switching frequencies (F 1 , F 2 , . . . F n ) for the elementary converters according to the supply currents (I R1 , I R2 , . . . I Rn ).
5. A device for controlling a multiphase resonant DC/DC converter comprising a plurality of identical elementary resonant DC/DC converters connected in parallel and provided with supply currents (I R1 , I R2 , . . . I Rn ), the device comprising:
an intensity measurement device for each of the supply currents ( 1 R1 , I R2 , . . . I Rn ) of the elementary converters for balancing the supply currents (I R1 , I R2 , . . . I Rn ), and configured to implement a method for controlling the multiphase resonant DC/DC converter;
a comparator between an output voltage (Vo) of the multiphase converter and a nominal voltage (Vref); and
a regulation loop which sets the supply currents (I R1 , I R2 , . . . I Rn ) to a common reference intensity (Iref);
the method for controlling comprising the steps of:
measuring each of the supply currents (I R1 , I R2 , . . . I Rn ) of the elementary converters for balancing the supply currents (I R1 , I R2 , . . . I Rn );and
controlling switching frequencies (F 1 , F 2 , . . . F n )of the elementary converters according to the supply currents (I R1 , I R2 , . . . I Rn )so as to carry out the balancing;
the device further comprising frequency generators ( 21 ) which generate the switching frequencies (F 1 , F 2 , . . . F n for the elementary converters according to the supply currents (I R1 , I R2 , . . . I Rn .
6. A device for controlling the multiphase resonant DC/DC converter according to claim 5 , wherein the intensity measurement means ( 13 ) comprise:
shunts ( 12 ) inserted in series in supply circuits of the elementary converters;
a voltage measurement device which determines differences of potential (VR 1 , VR 2 , . . . VRn) at the terminals of the shunts ( 12 ).
7. A multiphase resonant DC/DC converter, comprising a control device for controlling a multiphase resonant DC/DC converter comprising a plurality of identical elementary resonant DC/DC converters connected in parallel and provided with supply currents (I R1 , I R2 , . . . I Rn ), the control device comprising:
an intensity measurement device for each of the supply currents ( 1 R1 , 1 R2 , 1 Rn ) of the elementary converters for balancing the supply currents (I R1 , I R2 , . . . 1 Rn and configured to implement a method for controlling the multiphase resonant DC/DC converter;
a comparator between an output voltage (Vo) of the multiphase converter and a nominal voltage (Vref); and
a regulation loop which sets the supply currents I 1 , I R2 , . . . 1 Rn ) to a common reference intensity (Iref);
the method for controlling comprising the steps of:
measuring each of the supply currents (I 1 , I R2 , . . . I Rn ) of the elementary converters for balancing the supply currents (I R1 , I R2 , . . . I Rn ); and
controlling switching frequencies (F 1 F 2 , . . . F n ) of the elementary converters according to the supply currents (I R1 , I R2 , . . . I Rn )so as to carry out the balancing;
the device further comprising frequency generators ( 21 ) which generate the switching frequencies (F 1 , F 2 , . . . for the elementary converters according to the supply currents (I R1 , I R2 , . . . I Rn .