Patent ID: 11936302
Assignee: FUJI ELECTRIC CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  G  Y | IPC G  H

Claim 5:
6. A switching control circuit configured to control switching of a switching device that is configured to control an inductor current flowing through an inductor in a power supply circuit, the switching control circuit comprising:
a determination circuit configured to determine whether a load of the power supply circuit is a light load;
an oscillator circuit configured to output an oscillator signal
to drive the switching device in a first mode, when the load is the light load, and
to drive the switching device in a second mode, when the load is not the light load;

a driver circuit configured to drive the switching device in response to the oscillator signal;
a pulse generator circuit configured to generate a pulse signal;
a temperature voltage generator circuit configured to
generate a detection voltage corresponding to a temperature of the switching control circuit, based on a predetermined constant current, when the pulse signal is at a first level, and
stop generating the detection voltage, when the pulse signal is at a second level; and

an output circuit configured to output a detection signal indicating whether the temperature is higher than a predetermined temperature based on the detection voltage, during a period of time between
a first time that is a predetermined time period after the pulse signal reaches the first level,

and
a second time at which the pulse signal switches from the first level to the second level,

the pulse signal remaining in the first level in the period of time, wherein
the oscillator circuit, upon receiving the detection signal indicative that the temperature is higher than the predetermined temperature, causes a switching operation of the switching device to stop.