Circuit for generating auxiliary power

1 . A circuit for generating auxiliary power comprising:

a switching unit comprising at least one upper switch and at least one lower switch which are conducting complementarily to each other;

a resonant converter configured to convert power inputted from the switching unit and output the converted power; and

a rectifier configured to rectify the output of the resonant converter to output an auxiliary power,

wherein the resonant converter comprises a plurality of primary circuits connected in parallel and a plurality of secondary circuits corresponding to the plurality of primary circuits,

wherein the rectifier comprises a plurality of rectifiers corresponding to the plurality of secondary circuits,

wherein the plurality of primary circuits outputs a plurality of individual auxiliary powers through one secondary circuit among the plurality of secondary circuits and one rectifier among the plurality of rectifiers, and

wherein the auxiliary power is a power of gate driver of a switching element having a reference potential different from ground.

2 . The circuit for generating auxiliary power according to claim 1 ,

wherein the switching unit is formed as a half-bridge circuit comprising the one upper switch and the one lower switch or formed as a full-bridge circuit comprising a plurality of upper switches and a plurality of lower switches.

3 . The circuit for generating auxiliary power according to claim 1 ,

wherein the resonant converter comprises:

a primary circuit constituting a resonant circuit; and

a secondary circuit comprising a first coil and a second coil connected in parallel.

4 . The circuit for generating auxiliary power according to claim 3 ,

wherein the primary circuit comprises:

a first capacitor and a second capacitor connected in series with each other;

a first inductor connected to a node between the first capacitor and the second capacitor; and

a third coil connected in series with the first inductor,

wherein the upper switch and the lower switch are connected in series,

wherein one end of the third coil is connected to the first inductor and the other end is connected to a node between the upper switch and the lower switch, and

wherein the first coil, the second coil, and the third coil form a transformer.

5 . The circuit for generating auxiliary power according to claim 3 ,

wherein the primary circuit constitutes an LLC resonant converter, an LCC resonant converter, or a CLC resonant converter.

6 . The circuit for generating auxiliary power according to claim 3 ,

wherein the rectifier comprises:

a first diode connected in series with the first coil; and a second diode connected in series with the second coil.

7 . The circuit for generating auxiliary power according to claim 6 , comprising:

an output unit configured to provide power outputted from the rectifier as an auxiliary power,

wherein one end of the output unit is connected to a node between the first diode and the second diode, and the other end is connected to a node between the first coil and the second coil.

8 . The circuit for generating auxiliary power according to claim 1 ,

wherein the resonant converter operates at a resonant frequency.

9 . An auxiliary power generation device comprising:

a switching unit comprising at least one upper switch and at least one lower switch which are conducting complementarily to each other;

a resonant converter configured to convert the voltage inputted from the switching unit and outputs it;

a rectifier configured to rectify the output of the resonant converter and outputs an auxiliary power; and

a control unit configured to control a switching frequency of the switching unit so that the resonant converter operates at a resonant frequency,

wherein the resonant converter comprises a plurality of primary circuits connected in parallel and a plurality of secondary circuits corresponding to the plurality of primary circuits,

wherein the rectifier comprises a plurality of rectifiers corresponding to the plurality of secondary circuits,

wherein the plurality of primary circuits outputs a plurality of individual auxiliary powers through one secondary circuit among the plurality of secondary circuits and one rectifier among the plurality of rectifiers, and

wherein the auxiliary power is a power of gate driver of a switching element having a reference potential different from ground.

10 . The auxiliary power generation device according to claim 9 ,

wherein the switching unit is formed as a half-bridge circuit comprising the one upper switch and the one lower switch or formed as a full-bridge circuit comprising a plurality of upper switches and a plurality of lower switches.

11 . The auxiliary power generation device according to claim 9 ,

wherein the resonant converter comprises:

a primary circuit constituting a resonant circuit; and

a secondary circuit comprising a first coil and a second coil connected in parallel.

12 . The auxiliary power generation device according to claim 11 ,

wherein the primary circuit comprises:

a first capacitor and a second capacitor connected in series with each other;

a first inductor connected to a node between the first capacitor and the second capacitor; and

a third coil connected in series with the first inductor,

wherein the upper switch and the lower switch are connected in series,

wherein one end of the third coil is connected to the first inductor and the other end is connected to a node between the upper switch and the lower switch, and

wherein the first coil, the second coil, and the third coil form a transformer.

13 . The auxiliary power generation device according to claim 11 ,

wherein the primary circuit constitutes an LLC resonant converter, an LCC resonant converter, or a CLC resonant converter.

14 . The auxiliary power generation device according to claim 11 ,

wherein the rectifier comprises:

a first diode connected in series with the first coil; and a second diode connected in series with the second coil.

15 . The auxiliary power generation device according to claim 14 , comprising:

an output unit configured to provide power outputted from the rectifier as an auxiliary power,

wherein one end of the output unit is connected to a node between the first diode and the second diode, and the other end is connected to a node between the first coil and the second coil.

16 . The auxiliary power generation device according to claim 9 ,

wherein the resonant converter operates at a resonant frequency.