CPC H03K 17/08 (2013.01) [G01R 19/0092 (2013.01); G05F 1/573 (2013.01); H03F 3/45179 (2013.01); H03K 17/687 (2013.01)] | 19 Claims |
1. A current detection circuit, comprising:
a normally-on-type first switching element that has a source, a drain, and a gate;
a normally-off-type second switching element that has a source, a drain, and a gate and has a main current path that is connected to a main current path of the first switching element in series;
a normally-off-type third switching element that has a source that is connected to the source of the second switching element, a gate, and a drain that is connected to a constant current source, where a voltage that is applied to the gate of the second switching element at a time of current detection is applied to the gate of the third switching element; and
a division circuit including a first terminal connected to the drain of the second switching element and a second terminal connected to the drain of the third switching element, the division circuit being configured to divide a drain voltage of the second switching element supplied to the first terminal by a drain voltage of the third switching element supplied to the second terminal.
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