Shindengen Electric Manufacturing Company Limited

Kenichi Kubota

Hideyuki Ono

Masanori Hayashi

Hiroyuki Haga

Yukihiro Nozaki

Kenichi Suzuki

Haruo Watanabe

Yoshihiko Kikuchi

Yutaka Sekine

Shinya Iljima

Masaki Ohshima

Masaki Oshima

Kenichi Zenta

In a control circuit that controls an interleaved power supply, a clock generator generates a clock pulse having a predetermined frequency. A signal doubler generates a master switch on-interval pulse signal indicating information concerning an on-interval of the master switch based on the clock pulse and a master drive pulse signal that drives the master switch, and generates a doubled duty pulse signal having a duty that is double that of the master switch on-interval pulse signal. An edge pulse generator generates a first edge pulse signal based on the master drive pulse signal, and generates a second edge pulse signal based on the doubled duty pulse signal. A slave drive pulse signal generator generates, based on the first and second edge pulse signals, a slave drive pulse signal that drives the slave switch so that an on-interval of the slave switch is identical to that of the master switch.

Control circuit and interleaved power supply including that control circuit

A direction indication lamp control device includes: a current control element including an end which outputs a drive current having a magnitude corresponding to amplitude of a pulse signal; a current clamp unit which limits the drive current to a current upper limit value; a voltage clamp unit which limits a reference voltage to a voltage upper limit value; and a wire disconnection detection unit which outputs a wire disconnection detection signal in a case where the drive current corresponding to the pulse wave of the pulse signal is equal to or less than a wire disconnection detection value, or in a case where the reference voltage is equal to the voltage upper limit value. The current upper limit value is smaller than the drive current flowing through a direction indication lamp when the reference voltage is the voltage upper limit value.

Direction indication lamp control device, direction indication device and wire disconnection detection method of the direction indication device

A direction indication lamp control device includes: a pulse signal generation unit that generates a pulse signal; a current control element having one end to which power supply voltage is supplied, a control terminal to which the pulse signal is supplied, and the other end which outputs a drive current, the other end of the current control element being connected to one end of an external direction indication switch, and the other end of the direction indication switch being connected to a direction indication lamp; and a leak detection unit that causes the pulse signal generation unit to decrease the amplitude of the pulse signal in a case where the drive current corresponding to a pulse wave of the pulse signal is equal to or less than a leak detection current value during a leak detection period.

Direction indication lamp control device, direction indication device, and method of controlling direction indication device

The present invention provides a switching circuit comprising a current detecting circuit that detects current waveform of a main switch in real time waveform and outputs it in low impedance. The switching circuit comprises the current detecting circuit having the main switch (), of which on-voltage shows resistance characteristics, wherein a gate terminal is connected to a driving circuit () and further either terminal of drain or source thereof is connected to a fixed potential () and the other terminal thereof is connected to a load circuit () respectively, a first resistance element (), of which resistance value is higher than on-resistance of the main switch connected to the fixed potential (), a subsidiary switch (), a source terminal thereof is connected to the first resistance element (), an amplifier () that amplifies comparatively voltage generated in the first resistance element () and outputs to a gate terminal of the subsidiary switch () and the second resistance element () that generates voltage by amplifying on-current of the main switch () by connecting to the drain terminal of the subsidiary switch ().

Switching circuit

A switching power supply; wherein a voltage detector is provided at the output of a power supply circuit and connected to the negative input of an error amplifier to amplify the error between detected voltage and reference voltage, the output of said amplifier is connected to the negative input of a first comparator and to the negative input of a second comparator through split resistors, a filter circuit is connected between a control switch and synchronous switch and the output of said filter circuit is connected to a first comparator and a second comparator, wherein said configuration constitues a control means to control the amplitude of the triangular waveform obtained through said filter circuit to be between an input level of said first comparator and an input of said second comparator, whereby the stability of the switching power supply is ensured without lowering the frequency band of said amplified error signal and stable output ripple characteristics can be materialized.

Growing community of inventors

Saitama, Japan

Kenichi Kubota