US 11,855,546 B2
Output stabilization circuit and DC/DC converter circuit
Hiroyuki Miyazaki, Natori (JP)
Assigned to SUMIDA CORPORATION
Filed by SUMIDA CORPORATION, Tokyo (JP)
Filed on Mar. 3, 2022, as Appl. No. 17/685,440.
Claims priority of application No. 2021-049647 (JP), filed on Mar. 24, 2021.
Prior Publication US 2022/0311342 A1, Sep. 29, 2022
Int. Cl. H02M 3/338 (2006.01); H02M 1/08 (2006.01)
CPC H02M 3/3388 (2013.01) [H02M 1/08 (2013.01)] 5 Claims
OG exemplary drawing
 
1. An output stabilization circuit comprising:
a primary-side circuit including a first self-excited oscillator circuit and a second self-excited oscillator circuit connected to a direct-current power supply; and
a secondary-side circuit configured to obtain an output voltage by oscillation of the first self-excited oscillator circuit and the second self-excited oscillator circuit, wherein
the first self-excited oscillator circuit includes:
a first power transmission coil;
a first resonant capacitor constituting a resonant circuit together with the first power transmission coil;
a first pair of switching elements connected to the first power transmission coil; and
a first feedback coil magnetically coupled to the first power transmission coil and connected to each control electrode of the first pair of switching elements,
the second self-excited oscillator circuit includes:
a second power transmission coil;
a second resonant capacitor constituting a resonant circuit together with the second power transmission coil;
a second pair of switching elements connected to the second power transmission coil;
a second feedback coil magnetically coupled to the first feedback coil and connected to each control electrode of the second pair of switching elements; and
a phase shift filter connected between the second feedback coil and each control electrode of the second pair of switching elements,
the secondary-side circuit includes a secondary-side control coil in which a magnitude of a flowing current is controlled depending on a magnitude of the output voltage, and
the phase shift filter includes a primary-side control coil magnetically coupled to the secondary-side control coil and having a characteristic that an inductance changes depending on a current flowing through the secondary-side control coil.