Panasonic Intellectual Property Management Co., Ltd.

Panasonic Corporation

Yuji Yoshimoto

Masafumi Yamamoto

Hiroyuki Asano

Katunobu Hamamoto

Hisaya Takikita

Kazuhiro Kumada

Katsunobu Hamamoto

Hiroyuki Nakagawa

A trigger-signal-output part sets a burst time cycle to a time period N (integer of two or more) times as long as a constant first cycle, and outputs a trigger signal M (positive integer of N or less) times during an operation period so as to synchronize it with the first cycle, and does not output the trigger signal during a stop period except the operation period of the burst time cycle. Alternatively, a trigger-signal-output part sets a burst time cycle to a time period N times as long as an output cycle of a trigger signal in an operation period, and sets the operation period to a time period M times as long as the output cycle, and sets a stop period except the operation period of the burst time cycle to a time period generated by multiplying the output cycle by a difference between N and M.

Lighting device

A lighting device includes a voltage conversion circuit having at least a switching element connected to a positive potential side of the output terminals of the DC power source unit, and a drive unit which outputs a drive signal to the switching element. The drive unit has a first impedance element with a first impedance which is determined based on a power consumed by the drive unit before a predetermined time has elapsed after a control power source is supplied. A control capacitor for use in generating the drive signal is charged when the switching element is turned off during an on/off operation of the switching element. The lighting device further includes a second impedance element with a second impedance having a resistance component, which is arranged in a path in which the control capacitor can be charged in DC when the switching element does not perform the on/off operation.

Lighting device and illumination apparatus including same

An LED lighting device includes: a resistor Rconfigured to output a detection value of an inductor current Iflowing through an inductor Lduring an ON period of a switching element Q; a threshold generation sectionconfigured to generate a threshold value Vs of the inductor current Icorresponding to a dimming level; and a switching control sectionconfigured to control the switching element Qto turn on and off. The switching control sectionis configured to determine an OFF timing of the switching element Qbased on comparison between the detection value and the threshold value Vs of the inductor current I. The LED lighting device increases a period of a switching cycle of the switching element Qwith decrease of the dimming level.

LED lighting device and illuminating apparatus using the same

An LED lighting device includes: a power source unit for supplying the DC output voltage to a light-emitting diode; a control unit for adjusting the DC output voltage; and a control power source unit for supplying a control power to the control unit. The control power source unit generates the control power with the DC output voltage and has: a current-limiting resistor for limiting an electric current that flows from the power source unit to the control unit; a constant voltage unit for converting a voltage to be applied to the control unit through the current-limiting resistor unit to a constant voltage; and a switching unit for switching a resistance value of the current-limiting resistor unit among a plurality of resistance values.

Growing community of inventors

Hyogo, Japan

Yuji Yoshimoto