Tamura Corporation

Hiroo Ogawa

Tomohiko Yoshino

Kiyotaka Yoshida

Hirotoshi Aoki

Hisashi Shibata

Semiconductor driving circuit module

A drive circuit is provided. When the switching element is in turn-on state and a collector-emitter voltage of the switching element is equal to or higher than a first predetermined voltage value, the first diode is turned on; the first transistor and the second transistor are turned on; and, after a mask time in which a first capacitor is started to be charged with a current from a current source and a voltage value at two ends becomes equal to or higher than a second predetermined voltage value higher than the first predetermined voltage value, an abnormality detection signal is output to the control unit. The control unit stops an output of the pulse signal to the switching element in response to the abnormality detection signal.

Drive circuit

A high-side driver circuit is a circuit that drives a power semiconductor switch. The high-side driver circuit comprises a main switch N-channel MOSFET that has a drain terminal that is connected to a plus-side Vdc of a power supply and has a source terminal that is connected to an OUT terminal for a signal that drives the power semiconductor switch, a charge storage circuit that stores charge from the Vdc, and a voltage detection-capable switch that detects the voltage difference between an output terminal of the charge storage circuit and the Vdc and, upon detecting that the output terminal voltage of the charge storage circuit is at least a specific voltage higher than the voltage of a plus-side Vcc of the power supply, applies part or all of the output voltage of the charge storage circuit to a gate terminal of the main switch N-channel MOSFET.

High-side driver

An electronic componentincludes: a circuit board modulewhich is composed of a plurality of layers, and in which a primary circuitand secondary circuitsare each formed using wring patterns of a first layer Lto an eighth layer L; and a magnetic corewhich magnetically couples the primary circuitand the secondary circuits. The circuit board moduleincludes: a primary windingand secondary windingswhich are formed spirally around the magnetic core; and a third layer Land a sixth layer Linterposed between a fourth layer Lof the primary windingand a second layer Lof the secondary windingand between a fifth layer Lof the primary windingand a seventh layer Lof the secondary winding

Electronic component including planar transformer

An electronic componentincludes: a circuit board modulewhich is composed of a plurality of layers, and in which a primary circuitand secondary circuitsare each formed using wring patterns of a first layer Lto an eighth layer L; and a magnetic corewhich magnetically couples the primary circuitand the secondary circuits. The circuit board moduleincludes: cutout portionswhich are formed in a cutout shape from side edge portions toward an inner side and which position the magnetic coreat a predetermined attachment position in a state of housing the magnetic core; and widened portionswhich continue from the cutout portionsand are formed in a cutout shape from the side edge portions toward the inner side of the circuit board module, and which are formed on sides of the magnetic coreso as to be larger than a width Wfor housing of the cutout portions

A transformer is capable of suppressing the output voltage difference, and a switched-mode power supply apparatus uses the transformer. A transformer has a core; a primary winding provided in the core; a gap provided in the core at a location where the primary winding is provided; and at least two secondary windings, provided in the core and spaced apart from both sides of the primary winding as well as the gap at an equal distance in a winding axis direction of the primary winding. A switched-mode power supply apparatus has the transformer; a switching element connected to the primary winding of the transformer; and a control circuit configured to control the switching element.

Transformer and switched-mode power supply apparatus

A transformer being capable of reducing cross regulation even in a case where the load is unbalanced and a switched-mode power supply apparatus using the transformer are provided. A transformer T has a core; a primary winding provided in the core; at least two secondary windings provided in the core around a winding axis which is the same as a winding axis of the primary winding; and at least two auxiliary windings provided in the core around a winding axis which is the same as the winding axis of the primary winding; respectively neighboring the secondary windings; and connected in parallel to each other. A switched-mode power supply apparatus has the transformer T; a switching element connected to the primary winding of the transformer T; and a control circuit configured to control the switching element.

Growing community of inventors

Sakado, Japan

Hiroo Ogawa