1
Naoki Onishi, Tetsuya Hamana, Keisuke Ueda, Kouichi Ikegami, Kazuhiko Tachibana, Takuya Sakai: Discharge lamp lighting device, and illuminating device. Panasonic Electric Works, Ikeda Electric, Greenblum & Bernstein, July 5, 2011: US07973493 (2 worldwide citation)

In order to enhance stability of a discharge lamp at the time of dimming lighting even in the case where a light output is lowered, a direct current superimposing circuit superimposes a direct current voltage on an alternating current voltage applied to a fluorescent lamp, and a dimming signal corre ...


2
Masafumi Yamamoto, Tetsuya Hamana, Hiroyuki Asano: Electronic ballast with multimode lamp power control. Panasonic Corporation, Waddey & Patterson P C, Mark J Patterson, Mark A Pitchford, August 28, 2012: US08253351 (2 worldwide citation)

A control means has an adjustment function in a microprocessor to adjust variations in an output to a discharge lamp due to variations in components by correcting a duty ratio of a PWM signal for varying an operating frequency of an inverter circuit so that a detected value of a second detection cir ...


3
Tetsuya Hamana, Hiroyuki Asano, Masafumi Yamamoto: Lamp end of life protection circuit and method for an electronic dimming ballast. Panasonic Corporation, Waddey & Patterson P C, Mark J Patterson, June 5, 2012: US08193727 (1 worldwide citation)

A electronic ballast includes an inverter circuit for converting a DC voltage into a high-frequency voltage, a resonant circuit connected between outputs of the inverter circuit so as to light a discharge lamp by a resonant action, a control circuit for controlling the inverter circuit, a dimming ci ...


4
Masafumi Yamamoto, Tetsuya Hamana, Hiroyuki Asano: Electronic ballast with lamp end of life detection and protection circuits. Panasonic Corporation, Waddey & Patterson P C, Mark J Patterson, Gary L Montle, June 19, 2012: US08203282 (1 worldwide citation)

An electronic ballast A includes an inverter circuit for converting a DC voltage into a high-frequency voltage, a resonant circuit which is connected between outputs of the inverter circuit and lights a discharge lamp at a high frequency by a resonant action, a dimming circuit for changing an output ...


5
Masafumi Yamamoto, Tetsuya Hamana, Hiroyuki Asano: Electronic Ballast with Lamp End of Life Detection and Protection Circuits. Waddey & Patterson PC, January 7, 2010: US20100001649-A1

An electronic ballast A includes an inverter circuit for converting a DC voltage into a high-frequency voltage, a resonant circuit which is connected between outputs of the inverter circuit and lights a discharge lamp at a high frequency by a resonant action, a dimming circuit for changing an output ...


6
Tetsuya Hamana, Hiroyuki Asano, Masafumi Yamamoto: Lamp End of Life Protection Circuit and Method for an Electronic Dimming Ballast. Waddey & Patterson PC, January 7, 2010: US20100001650-A1

A electronic ballast includes an inverter circuit for converting a DC voltage into a high-frequency voltage, a resonant circuit connected between outputs of the inverter circuit so as to light a discharge lamp by a resonant action, a control circuit for controlling the inverter circuit, a dimming ci ...


7
Naoki Onishi, Tetsuya Hamana, Keisuke Ueda, Kouichi Ikegami, Kazuhiko Tachibana, Takuya Sakai: Discharge lamp lighting device, and illuminating device. Panasonic Electric Works, Ikeda Electric, Greenblum & Bernstein, January 21, 2010: US20100013393-A1

In order to enhance stability of a discharge lamp at the time of dimming lighting even in the case where a light output is lowered, a direct current superimposing circuit superimposes a direct current voltage on an alternating current voltage applied to a fluorescent lamp, and a dimming signal corre ...


8
Masafumi Yamamoto, Tetsuya Hamana, Hiroyuki Asano: Electronic Ballast with Multimode Lamp Power Control. Waddey & Patterson PC, February 11, 2010: US20100033101-A1

A control means has an adjustment function in a microprocessor to adjust variations in an output to a discharge lamp due to variations in components by correcting a duty ratio of a PWM signal for varying an operating frequency of an inverter circuit so that a detected value of a second detection cir ...


9
Naoki ONISHI, Hiroyuki ASANO, Tetsuya HAMANA, Masahiro YAMANAKA: Electronic ballast with input voltage fault control. Waddey & Patterson PC, October 28, 2010: US20100270949-A1

An electronic ballast includes circuitry to prevent a switch from being damaged in the case where an abnormality occurs in an output voltage of an input power supply. A DC power supply control circuit has a zero current detection circuit that, when a current through an inductor becomes equal to or l ...


10
Naoki Onishi, Hiroyuki Asano, Tetsuya Hamana, Masahiro Yamanaka: Fault detection and shutdown control circuits and methods for electronic ballasts. Waddey & Patterson PC, October 28, 2010: US20100270932-A1

An electronic ballast is capable of inhibiting ballast shutdown caused by erroneously determining a fault condition. The ballast includes a DC power supply circuit for outputting DC power, a power conversion circuit that appropriately converts DC power outputted by the DC power supply circuit and ou ...