Patent application number | Description | Published |
20100039039 | High pressure discharge lamp lighting device and luminaire - A high pressure discharge lamp lighting device, includes: a DC/DC converter for converting a power source voltage of a DC power source into a desired DC voltage and stably lighting a high pressure discharge lamp; a DC/AC inverter for inverting the DC voltage into an AC voltage; and a starting pulse generating circuit for generating a high voltage required for the start-up of the high pressure discharge lamp. Further, the high pressure discharge lamp lighting device includes a lighting state decision unit for deciding a lighted/unlighted state of the high pressure discharge lamp; and an operating state switching control unit for switching the operating state of at least one of the DC/DC converter, the DC/AC inverter, and the starting pulse generating circuit to another operating state, depending on a predetermined operation phase out of the start-up, stable lighting and power interrupt phases of the high pressure discharge lamp. | 02-18-2010 |
20100117547 | LAMP BALLAST AND AN ILLUMINATION APPARATUS - A lamp ballast capable of lighting a discharge lamp and an incandescent lamp each at an optimum condition. The lamp ballast has a DC-DC converter, an inverter that converts an output of DC-DC converter into an AC power for applying the same to a lamp load, a starting circuit generating a high voltage pulse from the AC power to provide the same to the lamp load, and a controller that controls the DC-DC converter and the inverter to provide a variable DC voltage and the AC power of variable frequency. The controller has a starting mode of operating the inverter at a starting frequency to generate the high voltage, and a lighting mode of operating the inverter at a lighting frequency lower than the starting frequency. The controller has a detection mode of causing the DC-DC converter to output a detection voltage of a predetermined level prior to the starting mode, a discharge lamp lighting program of operating, after the detection mode, the inverter in the starting mode and subsequently in the lighting mode, and an incandescent lamp lighting program of operating, after the detection mode, the inverter in the lighting mode without through the starting mode. When the detection voltage exceeds a predetermined threshold, the controller selects the discharge lamp lighting program, and otherwise selects the incandescent lamp lighting program. When the incandescent lamp is connected, the ballast turns on the incandescent lamp without applying a high voltage pulse so as to avoid lowering of the lamp life. | 05-13-2010 |
20100327775 | HIGH PRESSURE DISCHARGE LAMP LIGHTING DEVICE AND LIGHTING FIXTURE USING THE SAME - A high pressure discharge lamp lighting device comprising an inverter, an igniter, a controller, a pulse voltage detection circuit, and the starting pulse voltage regulation circuit. The inverter applies a lighting voltage to a high pressure discharge lamp. The controller applies the starting pulse voltage generated by the igniter to the high pressure discharge lamp. The pulse voltage detection circuit is configured to detect a voltage indicative of the starting pulse voltage to output a detection signal. The starting pulse voltage regulation circuit is configured to regulate the starting pulse voltage to a desired value of the starting pulse voltage on the basis of the detection signal. The pulse voltage detection circuit is configured to detect either one of the voltage developed in the specified circuit component of the igniter and the starting pulse voltage as the voltage indicative of the voltage indicative of the starting pulse voltage. | 12-30-2010 |
20100327776 | HIGH PRESSURE DISCHARGE LAMP LIGHTING DEVICE AND LIGHTING FIXTURE USING THE SAME - A high pressure discharge lamp lighting device in this invention comprises a converter, an inverter, an igniter, a controller, and a pulse voltage detection circuit. The converter outputs the direct current voltage. The inverter converts the direct current voltage into the lighting voltage which is alternating current voltage, and applies the lighting voltage to the high pressure discharge lamp through an output terminal. The igniter is configured to output the pulse voltage superimposed on the lighting voltage, whereby the starting voltage is applied to the high pressure discharge lamp. The controller is configured to control the igniter to allow the igniter to superimpose the pulse voltage on the lighting voltage. The pulse voltage detection circuit detects the starting voltage to output the detection signal. The starting voltage regulation circuit regulates the starting voltage to the desired voltage value of the voltage on the basis of the detection signal. | 12-30-2010 |
20110037406 | HIGH PRESSURE DISCHARGE LAMP LIGHTING APPARATUS AND LIGHTING FIXTURE - The high pressure discharge lamp lighting apparatus ( | 02-17-2011 |
Patent application number | Description | Published |
20090146579 | DISCHARGE-LAMP LIGHTING DEVICE AND LUMINAIRE - There is provided a discharge-lamp lighting device that, upon start-up of a high-intensity discharge lamp, alternately outputs a period A during which a starting circuit applies a high voltage to the high-intensity discharge lamp by resonance operation when a DC/AC inverter outputs a high-frequency voltage, and a period B during which the DC/AC inverter applies a low-frequency-square-wave voltage or a DC voltage to the high-intensity discharge lamp via the starting circuit. The period A for applying the high voltage by the resonance operation is set to about a time enough for a high-intensity discharge lamp in an initial aging stage to cause a dielectric breakdown, and a period C for alternately outputting the high-voltage generating period A and the period B for outputting the low-frequency-square-wave voltage or the DC voltage is set to about a time enough for a high-intensity discharge lamp in a life's last stage to cause a dielectric breakdown. | 06-11-2009 |
20090236999 | DISCHARGE LAMP LIGHTING DEVICE AND LIGHT FIXTURE - In a discharge lamp lighting device that, at a time of starting a discharge lamp La, alternately repeats periods HF | 09-24-2009 |
20100195297 | ELECTRONIC BALLAST WITH GROUNDING SPACER AND INSULATING FILLER - An electronic ballast provides a ballast housing including a circuit board electrically and mechanically connected to the ballast housing by an electrically conductive spacer. The circuit board includes a ground electrode surrounding a clearance hole through which an electrically conductive fastener is inserted into a fastener hole located in the spacer. An insulating filler is disposed in the ballast housing between the housing interior surface and the circuit board. A lighting fixture including an electronic ballast is also provided. | 08-05-2010 |
20110018453 | HID LAMP BALLAST WITH MULTI-PHASE OPERATION BASED ON A DETECTED LAMP ILLUMINATION STATE - An electronic ballast is provided for improved startup and powering of a high pressure discharge lamp. The ballast includes an inverter, a starting circuit for generating a high voltage to ignite the lamp, a controller for controlling an operating frequency of the inverter from startup to steady-state lamp operation, and a lamp output detection circuit. The controller controls the inverter in association with one or more of a first phase in which the starting circuit generates the high voltage and causes dielectric breakdown between the lamp electrodes, a second phase in which an electrode heating operation is performed after dielectric breakdown and a third phase in which steady-state operation of the lamp is performed. A lamp output determination is performed at a predetermined time before shifting to the third phase, and upon determining that the lamp is ignited the second phase is inserted. | 01-27-2011 |