| 摘要 |
A first-path connects an input-terminal and an output-terminal of a high-potential-side switching-element and includes a high-potential-side rectifying-device and a high-potential-side passive-element. A second-path connects the output-terminal of the high-potential-side switching-element and the output-terminal of a low-potential-side switching-element and includes a low-potential-side rectifying-device and a low-potential-side passive-element. A high-potential-side applying-unit applies voltage to a connecting point between the high-potential-side rectifying-device and the high-potential-side passive-element. A high-potential-side determining-unit determines that an overcurrent is flowing between the input-terminal and the output-terminal of the high-potential-side switching-element by using a first-value. A limiting-unit limits a current between the low-potential-side rectifying-device and the output-terminal of the high-potential-side switching-element if the overcurrent is flowing. A low-potential-side applying-unit applies voltage to a connecting point between the low-potential-side rectifying-device and the low-potential-side passive-element. A low-potential-side determining-unit determines that an overcurrent is flowing between the input-terminal and the output-terminal of the high-potential-side or low-potential-side switching element by using a second-value.
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