| 摘要 |
<p>A switching power source (20) includes: a transformer (23); a semiconductor switching element (25) that is provided at a primary side of the transformer (23); a rectifying-and-smoothing circuit (27) that is provided at a secondary side of the transformer (23); a switching controller (50) configured to perform a switching control to turn on-and-off the semiconductor switching element (25), wherein the switching controller (50) comprises: a stoppage circuit (67) configured to perform a stoppage process to stop the switching control when a first-level control signal is input, a restart circuit (65) configured to restart the switching control when a second-level control signal different in its level from the first-level control signal, and a limiting circuit (71) configured to limit, at the time of a start-up of the switching power source, a performance of the stoppage process performed by the stoppage circuit (67) until an output voltage of the switching power source (20) increases to a target voltage.</p> |
