Power converting device for reducing an induction problem
First Claim
1. A power converting device for converting DC current into AC current, said power converting device comprising:
- a pair of DC input terminals for receipt of DC current;
an inverter connected across said pair of DC input terminals and including a plurality of pairs of serially connected switching elements, for converting DC current received by said DC input terminals into AC current;
a pair of output terminals adapted for connection to a load and connected across serial connection points of said pairs of serially connected switching elements to permit connection of the load between said connection points;
a filter capacitor connected across said pair of DC input terminals;
an electrically insulating plate;
cooling means in thermal contact with said switching elements through said electrically insulating plate and electrically connected directly to one side of said filter capacitor;
a casing holding said switching elements; and
an electrically insulating mounting member mounting said cooling means on said casing, while electrically isolating said cooling means from said casing,whereby electrical currents induced in said cooling means are blocked by said electrically insulating mounting member from going to said casing and instead are caused to go to said filter capacitor.
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Accused Products
Abstract
In order to reduce an induction problem, which might otherwise be caused by a higher-harmonic current leaking to the outside of an inverter device, with a simple construction, an inverter device casing and a heat receiving plate mounted thereon are insulated from each other, and the heat receiving plate and a filter capacitor in the power supply circuit are connected through a predetermined inductance. Since the higher harmonics current is bypassed to the filter capacitor through the resonance filter which is formed by of the electrostatic capacity in a switching element and the inductance, the induction problem can be reduced by simple construction.
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Citations
5 Claims
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1. A power converting device for converting DC current into AC current, said power converting device comprising:
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a pair of DC input terminals for receipt of DC current; an inverter connected across said pair of DC input terminals and including a plurality of pairs of serially connected switching elements, for converting DC current received by said DC input terminals into AC current; a pair of output terminals adapted for connection to a load and connected across serial connection points of said pairs of serially connected switching elements to permit connection of the load between said connection points; a filter capacitor connected across said pair of DC input terminals; an electrically insulating plate; cooling means in thermal contact with said switching elements through said electrically insulating plate and electrically connected directly to one side of said filter capacitor; a casing holding said switching elements; and an electrically insulating mounting member mounting said cooling means on said casing, while electrically isolating said cooling means from said casing, whereby electrical currents induced in said cooling means are blocked by said electrically insulating mounting member from going to said casing and instead are caused to go to said filter capacitor. - View Dependent Claims (2, 3, 4, 5)
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Specification