A discharge lamp lighting device includes: a storage unit that stores information; a lamp drive unit that supplies drive power to the discharge lamp; a voltage detection unit that detects the lamp voltage of the discharge lamp; and a control unit that, on the basis of the voltage detection value supplied from the voltage detection unit, stores in the storage unit error log information that indicates the operating state of the discharge lamp when change of the lamp voltage indicates a predetermined voltage characteristic.

A discharge lamp driving device includes a discharge lamp driving section configured to supply a driving current to a discharge lamp including a first electrode and a second electrode and a control section configured to control the discharge lamp driving section. The control section is configured to repeat a unit period. The unit period includes a direct current period including a first direct current period in which a direct current having a first polarity is supplied to the discharge lamp and a second direct current period in which a direct current having a second polarity is supplied to the discharge lamp, and an alternating current period provided between the first direct current period and the second direct current period, an alternating current being supplied to the discharge lamp in the alternating current period. The control section is configured to temporally change length of the direct current period.

A discharge lamp driving device includes a discharge lamp driving section configured to supply a driving current to a discharge lamp including a first electrode and a second electrode and a control section configured to control the discharge lamp driving section. The control section is configured to repeat a unit period. The unit period includes a direct current period including a first direct current period in which a direct current having a first polarity is supplied to the discharge lamp and a second direct current period in which a direct current having a second polarity is supplied to the discharge lamp, and an alternating current period provided between the first direct current period and the second direct current period, an alternating current being supplied to the discharge lamp in the alternating current period. The control section is configured to temporally change length of the direct current period.

Multiphase lighting fixtures having one or more light emitting diode (LED) light sources are provided. In one example implementation, a light fixture includes one or more light sources, such as LED light sources. The light fixture includes a power conversion circuit. The power conversion circuit can be configured to receive a multiphase input power comprising three or more alternating current (AC) phases. The power conversion circuit can be further configured to convert the multiphase input power to rectified output for powering the one or more light sources. In some example implementations, the DC rectified output can have a voltage ripple of less than about 7%, such as less than about 3%.

In a discharge lamp driving device, a mixed period is provided, in which a first period in which an alternating current is supplied and a second period in which a direct current is supplied are alternately repeated and a third period alternately including a first direct current period and a second direct current period in which a direct current having a polarity opposite to a polarity of the direct current in the first direct current period is supplied. Length of the second direct current period is smaller than 0.5 ms. A total of lengths of the first direct current periods in the third period is larger than length of the second period. The third period is not provided at least when the inter-electrode voltage is smaller than a first predetermined value or when a cumulative lighting time of the discharge lamp is smaller than a second predetermined value.

A novel compact air-cavity electrodeless high intensity discharge lamp is disclosed that provides added flexibility in its design to improve performance and reliability. A coupling sleeve surrounds a bulb assembly that can replace the output coupling element require for effective operation of the lamp. The coupling sleeve couples the RF energy from the input coupling element to the bulb and the bulb assembly serves to provide the heat sinking needed for the bulb to operate within the temperature range necessary to achieve optimum performance with good reliability. Changing the design of the bulb assembly does not impact the resonant frequency of the air-cavity resonator. De-coupling the bulb assembly design from the operating frequency of the resonator gives more flexibility to designer to optimize the overall performance of the electrodeless HID lamp.

A power supply system for driving a light source includes a transformer including a primary winding and a plurality of secondary windings including an output bias winding, a control bias winding, and an RF bias winding, the output bias winding being electrically coupled to and configured to supply electrical power to the light source, a control circuit electrically coupled to and configured to receive electrical power from the control bias winding; and an RF communication circuit electrically coupled to and configured to receive electrical power from the RF bias winding.

A power supply system for driving a light source includes a transformer including a primary winding and a plurality of secondary windings including an output bias winding, a control bias winding, and an RF bias winding, the output bias winding being electrically coupled to and configured to supply electrical power to the light source, a control circuit electrically coupled to and configured to receive electrical power from the control bias winding; and an RF communication circuit electrically coupled to and configured to receive electrical power from the RF bias winding.

Provided is an excimer lamp light source device that achieves low cost and avoids the occurrence of narrowly-defined contracted discharge by adopting a lamp bulb having a simple structure and of the type in which a discharge current is passed in a tube axis direction. The excimer lamp light source device includes: an excimer lamp that has a pair of external electrodes configured to induce an electric discharge in a discharge space of a lamp bulb and to cause a discharge current to flow in a tube axis direction of the lamp bulb, and that generates UV light in the discharge space by the discharge; and an inverter having a transformer equipped with a secondary winding to which the external electrodes are connected in order to apply a high-voltage alternating current to the excimer lamp, the inverter supplying power lower than power that causes a linear discharge.

Provided is an excimer lamp light source device that achieves low cost and avoids the occurrence of narrowly-defined contracted discharge by adopting a lamp bulb having a simple structure and of the type in which a discharge current is passed in a tube axis direction. The excimer lamp light source device includes: an excimer lamp that has a pair of external electrodes configured to induce an electric discharge in a discharge space of a lamp bulb and to cause a discharge current to flow in a tube axis direction of the lamp bulb, and that generates UV light in the discharge space by the discharge; and an inverter having a transformer equipped with a secondary winding to which the external electrodes are connected in order to apply a high-voltage alternating current to the excimer lamp, the inverter supplying power lower than power that causes a linear discharge.