US 11,838,008 B2
Current detection circuit
Hideaki Majima, Tokyo (JP)
Assigned to Kabushiki Kaisha Toshiba, Tokyo (JP); and Toshiba Electronic Devices & Storage Corporation, Tokyo (JP)
Filed by Kabushiki Kaisha Toshiba, Tokyo (JP); and Toshiba Electronic Devices & Storage Corporation, Tokyo (JP)
Filed on Dec. 20, 2022, as Appl. No. 18/084,641.
Application 18/084,641 is a continuation of application No. 17/344,727, filed on Jun. 10, 2021, granted, now 11,569,810.
Application 17/344,727 is a continuation of application No. 16/815,498, filed on Mar. 11, 2020, granted, now 11,063,582, issued on Jul. 13, 2021.
Claims priority of application No. 2019-154471 (JP), filed on Aug. 27, 2019.
Prior Publication US 2023/0123382 A1, Apr. 20, 2023
Int. Cl. H03K 17/08 (2006.01); G01R 19/00 (2006.01); H03F 3/45 (2006.01); H03K 17/687 (2006.01); G05F 1/573 (2006.01)
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
OG exemplary drawing
 
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.