Sanken Electric Co., Ltd.

Satoshi Nakamoto

Masaru Nakamura

Chie Isshi

Hiroaki Nakamura

Jung Soo Lee

Yoshimichi Tadamasa

Youichi Terasawa

Akira Ichinose

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

The present invention includes: a zero crossing detection circuit which outputs a zero crossing signal when an inductor's regeneration period is completed; a light load detection circuit which compares an amplified error signal from an error amplifier and a threshold and outputs a light load signal; a timer circuit which outputs an intermittent operation enabling signal after a predetermined period based on the light load signal and zero crossing signal and outputs an intermittent operation disabling signal when the zero crossing signal is not outputted for a predetermined period; and an ON-OFF control controller which turns off a switching element when the amplified error signal falls below the threshold while the timer circuit is outputting the intermittent operation enabling signal, and turns on the switching element when the amplified error signal at least reaches or exceeds the threshold while the timer circuit is outputting the intermittent operation enabling signal.

DC/DC converter

A switching power-supply device includes a switching element; an output circuit; a feedback signal generation circuit; a control circuit that drives the switching element, based on the feedback signal, and controls the voltage of the power-supply output; a correction circuit that corrects a signal level of the feedback signal, wherein the control circuit comprises: an oscillation circuit that generates an on-trigger signal; a current detection circuit that generates a current detection signal; a difference detection circuit that generates a difference detection signal; a comparison circuit that generates an off-trigger signal, based on the current detection signal and the difference detection signal; and a first load detection circuit that controls an operation of the correction circuit, based on the current detection signal, and wherein the control circuit changes a setting voltage of the power-supply output, according to the signal level of the feedback signal.

Switching power-supply device and method for manufacturing switching power-supply device

A switching power-supply device includes a main switching element connected between a power-supply and an output terminal; a driving circuit that drives the main switching element; a capacitor that feeds power to the driving circuit; a charging circuit that charges the capacitor when the main switching element is switched from an on-state to an off-state; a switching control circuit that performs switching control of alternately switching the main switching element to the on-state and the off-state via the driving circuit; a voltage detection circuit that detects a voltage between both ends of the capacitor, and a driving control circuit that switches a state of prohibiting driving of the main switching element and a state of permitting driving of the main switching element, based on a difference between an output voltage output from the output terminal and a preset reference voltage and the voltage between both ends of the capacitor.

Growing community of inventors

Saitama, Japan

Satoshi Nakamoto