Sanken Electric Co., Ltd.

Youichi Terasawa

Akira Ichinose

Osamu Ohtake

Ryuichi Furukoshi

Yoshimichi Tadamasa

Satoshi Nakamoto

Takashi Kawaguchi

Voltage-dividing resistors are arranged in parallel with a first DC power supply. A first switch is electrically connected to a first resistor and a second resistor and includes a first terminal, a second terminal, and a control terminal. A second switch switches supply of a power voltage from a second DC power supply. A voltage comparator includes a first and a second input terminals. A reference power supply is connected to the first input terminal of the voltage comparator and outputs a reference voltage. The first terminal of the first switch is electrically connected to the second input terminal of the voltage comparator. The control terminal of the first switch is electrically connected to a positive voltage side of the second DC power supply. When the power voltage is supplied to the control terminal, and allows a voltage to be applied to the first and the second resistors.

Battery voltage detector

An interleaved DC-DC converter according to one or more embodiments includes a control circuit and N boost converters that are connected in parallel. The control circuit includes: an output voltage detection circuit that compares a detected voltage with a reference voltage, and outputs a comparison result as an error signal; N PWM generators that respectively generate pulses that on/off drive switching elements of the N converters; N current error amplifiers that compare current signals detected by respective current detectors with the error signal, and that outputs comparison results as feedback signals to the respective PWM generators; a differential detector that detects a difference between one feedback signal and another feedback signal for each of the feedback signals; and a latch circuit that stops all switching operations of the N converters when the differential detector detects that any one of the differences is a predetermined threshold value or more.

Interleaved DC-DC converter and semiconductor device having interleaved DC-DC converter

A power factor correction circuit includes: an ON time setting unit, which sets an ON time period of the switching element based on the output voltage; a bottom detection unit, which detects a bottom when a voltage between both ends of the switching element is damped-oscillated while the switching element is being turned off; and a bottom skip controller, which causes the switching element to perform quasi-resonant if a ratio of the ON time period set by the ON time setting unit to a regeneration period of a current flowing through the reactor while the switching element is being turned off is less than or equal to a predetermined value, and turns on the switching element at a timing when a next bottom is reached after one bottom skipped from an initial bottom if the ratio is greater than the predetermined value.

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Tokyo, Japan

Youichi Terasawa