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US 8,711,529 B2Granted
Switching apparatus and controlling method thereof
AssigneeSanken Electric Co., Ltd.
InventorsAkihiro Shinoda, Kiyokatsu Satoh, Hiroaki Kawaguchi
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Abstract
A switching apparatus includes a DC voltage output unit, a switching element to supply the DC voltage to a load, a power detection unit to detect power supplied from the switching element to the load, a drive unit to control the switching element in PWM manner according to an output from the power detection unit, and a stop unit to stop the PWM control if a value of the DC voltage is lower than a first threshold value. The first threshold value is lower than a minimum operation voltage value of the power detection unit.
Claims5
A switching apparatus comprising:
- a DC voltage output unit to output a DC voltage;
- a switching element supplying the DC voltage to a load;
- a power detection unit detecting power supplied from the switching element to the load;
- a driver configured to control the switching element in a manner of PWM according to an output from the power detection unit;
- and
- a stop unit configured to stop the PWM control if a value of the DC voltage is lower than a first threshold value, wherein
- the first threshold value is lower than a minimum operation voltage value of the power detection unit
- wherein
- the apparatus has a second threshold value higher than the minimum operation voltage value of the power detection unit, and
- if the value of the DC voltage is lower than the second threshold value, the driver controls the switching element at a constant duty ratio.
7 more elements
Dependencies are inferred from the claim text.