Micro electric power converter
View Patent ↗A thin film magnetic induction element includes a ferrite substrate, a coil provided across the ferrite substrate and including connection conductors and coil conductors, and terminals provided on perimeter portions of the substrate. Terminals capable of being adversely affected by an induced magnetic flux, such as a VDD terminal, a CGND terminal, an IN terminal, a PVDD terminal, a PGND terminal, an FB terminal, a CE terminal, and an AL terminal are arranged along the Y-direction of the substrate, in which the magnetic flux density is low. Terminals substantially incapable of being adversely affected by an induced magnetic flux are arranged along the X-direction of the substrate, in which the magnetic flux density is high. A micro electric power converter having the thin film magnetic induction element is less susceptible to circuit malfunctions.
1. A micro electric power converter comprising:
a magnetic insulator substrate;
a coil provided across a central portion of the magnetic insulator substrate;
first terminals and second terminals provided on a perimeter portion of the magnetic insulator substrate;
a semiconductor chip comprising circuits connected to the first terminals and the second terminals; and
passive component parts,
wherein a direction perpendicular to a cross section of a coil of the solenoid is designated as an X-direction in which a magnetic flux density generated by current flowing through the coil is high, and a direction perpendicular to the X-direction is designated as a Y-direction in which the magnetic flux density is low, and
wherein the first terminals, through which are transmitted signals capable of causing a circuit malfunction under the influence of voltages induced by the magnetic flux, are arranged along the Y-direction; and the second terminals, through which are transmitted signals substantially incapable of causing a circuit malfunction under the influence of voltages induced by the magnetic flux, are arranged along the X-direction.
2. The micro electric power converter according to claim 1 , wherein the magnetic insulator substrate comprises a ferrite substrate.
3. The micro electric power converter according to claim 1 , wherein voltages of the signals transmitted through the first terminals comprise a power supply voltage of a control circuit, a ground voltage of the control circuit, and voltages of analog signals inputted to and outputted from the control circuit.
4. The micro electric power converter according to claim 1 , wherein voltages of the signals transmitted through the second terminals comprise digital signal voltages.
5. A micro electric power converter comprising:
a magnetic insulator substrate;
a coil provided across a central portion of the magnetic insulator substrate;
first terminals and second terminals provided on a perimeter portion of the magnetic insulator substrate;
a semiconductor chip comprising circuits connected to the first terminals and the second terminals on one side of the magnetic insulator substrate; and
a printed circuit board connected to the first terminals and the second terminals on the magnetic insulator substrate, the printed circuit board comprising passive component parts mounted thereon;
wherein a direction perpendicular to a cross section of a coil of the solenoid is designated as an X-direction in which a magnetic flux density generated by current flowing through the coil is high, and a direction perpendicular to the X-direction is designated as a Y-direction in which the magnetic flux density is low, and
wherein the first terminals are arranged along the Y-direction when an impedance seen therefrom in the direction of the semiconductor chip is higher than the impedance seen therefrom in the direction of the printed circuit board, and the second terminals are arranged along the X-direction when the impedance seen therefrom in the direction of the semiconductor chip is lower than the impedance seen therefrom in the direction of the printed circuit board.
6. The micro electric power converter according to claim 5 , wherein at least a portion of the first terminals transmits signals capable of causing a circuit malfunction under the influence of voltages induced by the magnetic flux.