| 摘要 |
A switching power source includes: a transformer; a semiconductor switching element that is provided at a primary side of the transformer; a rectifying-and-smoothing circuit that is provided at a secondary side of the transformer; a switching controller configured to perform a switching control to turn on-and-off the semiconductor switching element, wherein the switching controller comprises: a stoppage circuit configured to perform a stoppage process to stop the switching control when a first-level control signal is input, a restart circuit 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 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 until an output voltage of the switching power source increases to a target voltage. |
| 主权项 |
1. A power supply system, comprising:
a switching power source comprising:
a transformer;a semiconductor switching element that is provided at a primary side of the transformer;a rectifying-and-smoothing circuit that is provided at a secondary side of the transformer;a switching controller configured to perform a switching control to turn on-and-off the semiconductor switching element, the switching controller being configured to start the switching control in response to receiving power from an AC power source,wherein the switching controller comprises:
a stoppage circuit configured to perform a stoppage process to stop the switching control when a first-level control signal, which is associated with a first level, is input;a restart circuit configured to restart the switching control when a second-level control signal, which is associated with a second level and is different in its level from the first-level control signal, is input; anda limiting circuit configured to limit, when the limiting circuit is started in response to receiving power from the AC power source, a performance of the stoppage process performed by the stoppage circuit;a control device configured to start up in response to receiving power from the AC power source and to output one of a first switching signal to switch a control signal input into the switching controller to the first-level control signal and a second switching signal to switch the control signal input into the switching controller to the second-level control signal,wherein, during start-up of the control device, the control device outputs the first switching signal, andwherein, after the control device is started up, the limiting circuit releases a limitation of the performance of the stoppage process. |
