MULTILAYER CIRCUIT BOARD AND MOTOR DRIVE CIRCUIT BOARD
1 Assignment
0 Petitions
Accused Products
Abstract
A multilayer circuit board in which wirings are arranged so that the inductance thereof is reduced. A ground wiring and a power source wiring which are provided in a multilayer circuit board are arranged so that most of the wirings are superposed vertically along a direction of a longer side of the circuit board, and since currents flow in an opposite direction to each other in the portions which are superposed, magnetic fields generated by the currents so flowing are canceled by each other. Similarly, a W-phase wiring, a V-phase wiring and a W-phase wiring are also arranged so that the wirings are partially superposed along their longer side direction vertically, and magnetic fields generated by currents flowing in the portions which are superposed vertically are canceled by one another. By this, the inductance of the wirings can be reduced by increasing a mutual inductance between these wirings.
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Citations
10 Claims
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1-5. -5. (canceled)
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6. A multilayer circuit board including a plurality of conductor layers and a plurality of resin insulation layers which are laminated alternately, comprising:
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a first wiring formed on a first layer of the plurality of conductor layers; a second wiring formed on a second layer of the plurality of conductor layers; a third wiring formed on a third layer of the plurality of conductor layers, wherein portions of the first wiring and the second wiring which face each other in a laminated direction in which the plurality of conductor layers are laminated extend in parallel; wherein the first wiring and the second wiring are arranged so as to weaken a magnetic field generated by a current which flows through the first wiring and a magnetic field generated by a current which flows through the second wiring to each other; wherein the first wiring and the second wiring are a power source wiring and a ground wiring in which currents flow therethrough in an opposite direction to each other; and wherein the first wiring, the second wiring, and the third wiring are respectively connected to phases of a multiphase motor provided outside. - View Dependent Claims (7, 8)
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9. A motor drive circuit board for an electric power steering system, comprising:
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a multilayer circuit board which includes a plurality of conductor layers and a plurality of resin insulation layers, the conductor layers and the resin insulation layers being laminated alternately; a first wiring formed on a first layer of the plurality of conductor layers; a second wiring formed on a second layer of the plurality of conductor layers; and a third wiring formed on a third layer of the plurality of conductor layers, wherein portions of the first wiring and the second wiring which face each other in a laminated direction in which the plurality of conductor layers are laminated extend in parallel; wherein the first wiring and the second wiring are arranged so as to weaken a magnetic field generated by a current which flows through the first wiring and a magnetic field generated by a current which flows through the second wiring to each other; wherein the first wiring and the second wiring are a power source wiring and a ground wiring in which currents flow therethrough in an opposite direction to each other; and wherein the first wiring, the second wiring, and the third wiring are respectively connected to phases of a multiphase motor provided outside. - View Dependent Claims (10)
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Specification