Semiconductor device
AssigneeFuji Electric Co., Ltd.
InventorYuki Kumazawa
Life of this patent
Estimating the term…
Abstract
A semiconductor device includes an output circuit and a switching element. The output circuit includes a switching element, a sense switching element, and a shunt breaking circuit. When an upper arm side switching element changes from an on-state to an off-state, a regenerative current flows from a load because of the regenerative operation of the load. In the output circuit, the shunt breaking circuit is located on the low potential side of a sense MOSFET in the sense switching element. As a result, a shunt of the regenerative current, which is generated at the time of the regenerative operation of the load, to the sense switching element is cut off by the shunt breaking circuit.
Claims20
A semiconductor device, comprising:
- a lower arm circuit including a lower arm side output circuit including:
- a lower arm side switching element that is switching-controlled by a lower arm side control circuit and that supplies a power to a load;
- a lower arm side current monitoring element that is switching-controlled by the lower arm side control circuit and that monitors a current flowing through the lower arm side switching element;
- and
- a lower arm side shunt breaking circuit that is a circuit element that, without application of a control signal, always blocks current in one direction and allows current to pass in the opposite direction, the lower side shunt breaking circuit being electrically connected to a low potential side terminal of the lower arm side current monitoring element;
- and
- an upper arm side switching element connected in series with the lower arm side switching element, wherein
- the lower arm side shunt breaking circuit cuts off a shunt of a regenerative current flowing from the load to the lower arm side current monitoring element upon the upper arm side switching element changing from an on-state to an off-state, the load being connected to a connection point of the upper arm side switching element and the lower arm side switching element at one side thereof, and connected to a low potential side terminal of the lower arm side switching element at another side thereof.
A semiconductor device, comprising:
- an upper arm circuit including an upper arm side output circuit including:
- an upper arm side switching element that is switching-controlled by an upper arm side control circuit and that supplies a power to a load;
- an upper arm side current monitoring element that is switching-controlled by the upper arm side control circuit and that monitors a current flowing through the upper arm side switching element;
- and
- an upper arm side shunt breaking circuit that is a circuit element that, without application of a control signal, always blocks current in one direction and allows current to pass in the opposite direction, the lower side shunt breaking circuit being electrically connected to a low potential side terminal of the upper arm side current monitoring element;
- and
- a lower arm side switching element connected in series with the upper arm side switching element, wherein
- the upper arm side shunt breaking circuit cuts off a shunt of a regenerative current flowing from the load to the upper arm side current monitoring element upon the lower arm side switching element changing from an on-state to an off-state, the load being connected to a high potential side terminal of the upper arm side switching element at a first end thereof, and connected to a connection point of the lower arm side switching element and the upper arm side switching element at a second end thereof.
Dependencies are inferred from the claim text.