Current control apparatus and manufacturing method for current control apparatus
Provided is a current control apparatus including a first cooler that cools a switch element, a bus bar connected to the switch element, a core penetrated by the bus bar, a magneto-electric transducer, which is inserted into the core in order to detect a value of a current supplied to the switch element, a controller that controls the switch element, a case, and a cover, wherein the core includes an exposed disposal structure in which a part of the core is exposed to the exterior of the case as an exposed portion, and the current control apparatus further includes a divided cooling structure in which the exposed portion is cooled without being affected by the temperature of the first cooler that cools the switch element.
1. A current control apparatus comprising:
a switch element;
a first cooler that cools the switch element;
a bus bar connected to the switch element;
a first core penetrated by the bus bar and comprises a first gap;
a magneto-electric transducer inserted into the first gap, the magneto-electric transducer detecting a value of a current that flows through the bus bar to be supplied to the switch element;
a controller that controls the switch element, using the current value detected by the magneto-electric transducer;
a case that houses the switch element, the first core, the magneto-electric transducer, and the controller; and
a cover provided to cover an opening portion of the case so that an interior of the case is hermetically sealed,
wherein the first core includes an exposed disposal structure in which a part of the first core other than the first gap projects from the case and is exposed to an exterior of the case as an exposed portion,
the first gap is housed in the case and is not exposed to the exterior of the case; and
the current control apparatus further includes a divided cooling structure in which the exposed portion is cooled without being affected by a temperature of the first cooler that cools the switch element.
2. The current control apparatus according to claim 1 , wherein the divided cooling structure includes a second cooler provided at a remove from the first cooler and that cools the exposed portion.
3. The current control apparatus according to claim 2 , wherein a volume and a surface area of the second cooler and a coolant that is used by the second cooler are set individually, independently of the first cooler, so that the second cooler cools the exposed portion to a desired temperature, independently of the first cooler.
4. The current control apparatus according to claim 1 , wherein the divided cooling structure comprises a duct connected to the first cooler and through which the exposed portion is inserted, and
the first cooler and the exposed portion are cooled by forcibly circulating a coolant that is used to cool the first cooler, through the duct by convection.
5. The current control apparatus according to claim 4 , wherein the coolant is forcibly circulated through the duct by convection after defining a flow direction of the coolant such that the coolant flows to the first cooler via the exposed portion.
6. The current control apparatus according to claim 1 , further comprising a plurality of cores,
the magneto-electric transducer is inserted into each of gaps respectively provided in the plurality of cores, and
when the plurality of cores are cooled by an effect that is obtained by combining a first cooling performance using the divided cooling structure and a second cooling performance using the exposed disposal structure, a total cooling performance that is obtained by combining the first cooling performance and the second cooling performance is uniform among the plurality of cores.
7. The current control apparatus according to claim 2 , further comprising a plurality of cores,
the magneto-electric transducer is inserted into each of gaps respectively provided in the plurality of cores, and
when the plurality of cores are cooled by an effect that is obtained by combining a first cooling performance using the divided cooling structure and a second cooling performance using the exposed disposal structure, a total cooling performance that is obtained by combining the first cooling performance and the second cooling performance is uniform among the plurality of cores.
8. The current control apparatus according to claim 3 , further comprising a plurality of cores,
the magneto-electric transducer is inserted into each of gaps respectively provided in the plurality of cores, and
when the plurality of cores are cooled by an effect that is obtained by combining a first cooling performance using the divided cooling structure and a second cooling performance using the exposed disposal structure, a total cooling performance that is obtained by combining the first cooling performance and the second cooling performance is uniform among the plurality of cores.
9. The current control apparatus according to claim 4 , further comprising a plurality of cores,
the magneto-electric transducer is inserted into each of gaps respectively provided in the plurality of cores, and
when the plurality of cores are cooled by an effect that is obtained by combining a first cooling performance using the divided cooling structure and a second cooling performance using the exposed disposal structure, a total cooling performance that is obtained by combining the first cooling performance and the second cooling performance is uniform among the plurality of cores.
10. The current control apparatus according to claim 5 , further comprising a plurality of cores,
the magneto-electric transducer is inserted into each of gaps respectively provided in the plurality of cores, and
when the plurality of cores are cooled by an effect that is obtained by combining a first cooling performance using the divided cooling structure and a second cooling performance using the exposed disposal structure, a total cooling performance that is obtained by combining the first cooling performance and the second cooling performance is uniform among the plurality of cores.
11. A manufacturing method for the current control apparatus according to claim 1 , the manufacturing method comprising integrally molding the core with the case in a condition in which the exposed portion is exposed to the exterior of the case.
12. The current control apparatus according to claim 1 , further comprising:
a second core penetrated by the bus bar and comprising a second gap in which the magneto-electric transducer is inserted, the second core being parallel to the case; and
a third core penetrated by the bus bar and comprising a third gap in which the magneto-electric transducer is inserted, the third core being recessed within the case.