Mitsumi Electric Company Ltd.

Kenji Mitsuhira

Fumihiro Inoue

Heisuke Nakashima

The present disclosure provides a drive circuit whereby dead times and boost periods can be generated accurately. A drive circuit includes: a drive terminal; a first source current source to generate a first source current; a second source current source to generate a second source current; a first sink current source to generate a first sink current; a second sink current source to generate a second sink current; a logic circuit to generate a source drive command and a sink drive command in accordance with a clock; and a control circuit to generate a source boost signal and a sink boost signal in accordance with the clock.

Drive circuit

A DC-DC converter, which allows a current to pass through an inductor and rectifies the current through the inductor to convert an input direct current voltage supplied from a direct current power unit into a direct current voltage at a different potential and output the direct current voltage, includes a switching control circuit performing peak-current control procedures including turning on the switching element when the converted direct current voltage drops to a predetermined potential and turning off the switching element when the current through the inductor reaches a predetermined value. The converter includes a copied-current generating circuit generating a current proportional to the output current. The switching control circuit turns off the switching element when the circuit detects that the current through the inductor reaches a predetermined value with reference to a combined current of the copied current generated at the copied-current generating circuit and a predetermined reference current.

Growing community of inventors

Tama, Japan

Kenji Mitsuhira