Abstract:
A circuit board for heat dispersion includes a rectangle dielectric layer (10) and a plurality of pad groups (1, 2, 3) for soldering an electronic element. The pad groups (1, 2, 3) are laid on the front surface of the dielectric layer (10). Each pad group comprises a plurality of metal conductive pads (11, 12, 13), (21, 22, 23), (31, 32, 33) which are arranged at intervals. There is a first transverse insulating isolated area (6) between the two adjacent pads (11, 12), (12, 13), (21, 22), (22, 23), (31, 32), (32, 33). The width of the insulating isolated area (6) is less than the span between the positive terminal solder area and the negative terminal solder area of the electronic component. There are an anode soldering sheet (7) and a cathode soldering sheet (8) on the back surface of the dielectric layer (10). The anode soldering sheet (7) and cathode soldering sheet (8) spread on the back surface of the dielectric layer (10). There is a second insulating isolated area (9) between the anode soldering sheet (7) and the cathode soldering sheet (8). The first pad (11, 21, 31) and the last pad (13, 23, 33) of each pad group have vias (111, 131), (211, 231), (311, 331). The wall of the vias have conductive plating layer. The plating layer connects the pads to the anode soldering sheet (7) or the cathode soldering sheet (8).
Abstract:
A high frequency, low impedance network is integrated into the substrate level of a power module for the reduction of electromagnetic interference ("EMI"). In one embodiment, capacitance is electrically connected to at least one of the positive conducting layer in a substrate or the negative conducting layer in a substrate and a ground. Integrating a capacitive network of low stray inductance in a substrate of a power module allows relatively small, inexpensive capacitors to be used.
Abstract:
A DC bus for use in a power module includes a positive DC conductor bus plate parallel with a negative DC conductor bus plate. The positive bus and negative bus permit counter-flow of currents, thereby canceling magnetic fields and their associated inductances, and the positive and negative bus are connectable to the center portion of a power module.
Abstract:
PROBLEM TO BE SOLVED: To solve the problem that any spurious electromagnetic radiation is newly generated in a case body level in such a stage that a circuit board is mounted on the case body when EMC measures of the circuit board are completed. SOLUTION: This circuit board is provided with a power source mounted on electronic equipment or the like and GND, and the GND of the circuit board is electrically connected to the GND of the other configuring elements of the electronic equipment by a connection component, and components or a circuit for achieving low impedance in a target frequency range are arranged between the opening peripheral conductor of a connection port to be used for the connection and the power source of the circuit board. COPYRIGHT: (C)2008,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To increase a width and a pitch of board terminals provided on a principal surface of a circuit board by decreasing the number of the board terminals. SOLUTION: The circuit board includes: the principal surface 100a; a reverse surface 100b parallel with the principal surface 100a; a side surface 100c positioned between edges of the principal surface 100a and the reverse surface 100b; and board terminals 102 and 101 covering parts of the principal surface 100a and the side surface 100c, respectively. The board terminals are provided on not only the principal surface, but also the side surface of the circuit board, thereby, while the width and pitch of the board terminals are sufficiently secured, the total number of the board terminals can be increased. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To effectively reduce noises produced by the switching action of a driving circuit in an electronic controller. SOLUTION: In an electronic controller having a charge pump circuit 45, a dedicated power wiring 1 and a power wiring 3 common to each circuit are connected to the charge pump circuit 45 through a via hole va whose impedance is larger than that of the wiring pattern, and similarly, a dedicated ground wiring 5 and a ground wiring 7 common to each circuit are connected to the circuit 45 through a via hole vb. Further, a condenser C for controlling noise production is connected between a power wiring 2 connecting the via hole va and the power wiring 1, and a ground wiring 6 connecting the via hole vb and the ground wiring 5. Accordingly, a sharp current variation is surely prevented from being produced to the common power wiring 3 and the ground wiring 7 by the switching action of switching devices 12 and 13 of the circuit 45. COPYRIGHT: (C)2005,JPO&NCIPI
Abstract:
PURPOSE: A circuit board and a semiconductor module including the same are provided to prevent processing and technical problems generated while forming via patterns by directly connecting a capacitor to metal cores. CONSTITUTION: A core unit(C) comprises a first metal core(122a), a second metal core(122b), top and bottom insulating layers(126a,126b). The first metal core passes through an extension direction of the core unit. The second metal core passes through the extension direction of the core unit. One side of the second metal core is arranged while facing one side of the first metal core. A second capacitor(130) is arranged between the first and second metal cores. The second capacitor comprises a first electrode(133a), a second electrode(133b), and a dielectric layer(131) between the first and second electrodes.