Output stabilizing circuit and DC/DC converter circuit

An output stabilization circuit comprising:

• a primary-side circuit including a self-oscillation circuit connected to a DC power supply;
• and
• a secondary-side circuit that obtains an output voltage by oscillation of the self-oscillation circuit, wherein
• the self-oscillation circuit includes
• a power transmission coil,
• a resonance capacitor that is connected in series with the power transmission coil and constitutes a series resonant circuit together with the power transmission coil,
• a switching circuit including a plurality of switching elements connected in a half-bridge configuration or a full-bridge configuration, the switching circuit being configured to switch a direction of a current flowing through the power transmission coil in accordance with an on-off state of the plurality of switching elements,
• a drive transformer of which a secondary-side coil is connected to a gate electrode of each of the plurality of switching elements,
• a feedback transformer of which a primary-side coil is connected to the power transmission coil, and
• a phase shift filter connected between a secondary-side coil of the feedback transformer and a primary-side coil of the drive transformer,
• the secondary-side circuit includes
• a power reception coil magnetically coupled to the power transmission coil, and
• a secondary-side control coil in which a magnitude of a current flowing is controlled in accordance with a magnitude of the output voltage, and
• the phase shift filter includes a primary-side control coil that is magnetically coupled to the secondary-side control coil and has a characteristic that an inductance changes in accordance with the current flowing through the secondary-side control coil.