Switching power supply device
A resonant capacitor Crk (k is a natural number of one to n) of each circuit element has one end connected in series to a resonant reactor Lr and a primary winding N 1 of a transformer T, and another end connected to the resonant capacitor Crk of another circuit element 10 so that a dimensional multiphase LLC converter having a phase difference of 360°/Pk is constructed by Pk (Pk is an optional natural number) of the circuit elements 10.
1 . A switching power supply device comprising:
a plurality of half-bridge LLC converters each configured as a circuit element, each of the plurality of half-bridge LLC converters including:
a first switch element and a second switch element connected in series between a positive electrode and a negative electrode of a DC power supply; and
a resonant circuit including a resonant reactor having one end connected to a connection point between the first switch element and the second switch element, a primary winding of a transformer, and n+1 resonant capacitors comprising a zero th order resonant capacitor to an n th order resonant capacitor, wherein n is a natural number equal to three or greater,
wherein in each circuit element the zero th order resonant capacitor has one end connected in series to the respective resonant reactor and the respective primary winding of the respective transformer, and another end connected to a respective power supply line, and
wherein in each circuit element a k th order resonant capacitor of the n+1 resonant capacitors of each circuit element has one end connected in series to the respective resonant reactor and the respective primary winding of the respective transformer, and another end connected to another k th order resonant capacitor of one or more other circuit elements so that a k dimensional multiphase LLC converter having a phase difference of 360°/Pk is constructed by Pk circuit elements, wherein k is a natural number between one and n, and Pk is a natural number equal to or greater than one.
2 . The switching power supply device according to claim 1 , wherein a total number of circuit elements is a product of numbers of phases included in dimensions.
3 . The switching power supply device according to claim 1 ,
wherein numbers of phases in one to n dimensions are set to be identical.
4 . The switching power supply device according to claim 1 , further comprising:
a dimension selection circuit that selects operation and stop of the circuit element in units of dimension; and
a selection signal generation circuit that generates a dimension selection signal for controlling the dimension selection circuit.
5 . The switching power supply device according to claim 1 , wherein the circuit elements are modularized and connected in a multidimensional manner, the modularized circuit elements including n+1 of the resonant capacitors.
6 . The switching power supply device according to claim 1 , wherein the circuit elements are modularized and connected in a multidimensional manner, the modularized circuit elements being provided with a resonant capacitor additional terminal for dimension expansion to which n of the n+1 of the resonant capacitors are connectable.
7 . The switching power supply device according to claim 1 , wherein a plurality of Pk phase LLC converters are modularized and connected in a multidimensional manner, the modularized Pk phase LLC converters including Pk of the circuit elements.