A circuit module includes a board, a boosting circuit, a processing and a plasma tube. The board is for connecting with a circuit board device with opposite thicknesswise sides. The boosting circuit includes at least one conductive path and electronic components electrically connected to the conductive path. The conductive path includes a power input portion electrically connecting with a power output portion of the circuit board device and two power output terminals. The processing unit is includes a frequency changing circuit electrically connected with the power input portion and the boosting circuit and for transferring an input power into an output power for the boosting circuit, and the input and output power has different frequencies. The plasma tube is electrically connected to the two power output terminals. An electronic device includes one said circuit module and a circuit board device electrically connected to the circuit module.

A light source device includes a light source unit having a dielectric barrier discharge lamp and a lighting circuit. The lighting circuit includes a transformer; a switching element; a controller for the switching element; a detector that detects current flowing through or voltage on a primary or a secondary side of the transformer; and a determination unit. The controller is configured to enable performing a steady-state operation of controlling ON/OFF of the switching element at a steady-state operation frequency (f1) to steadily light the dielectric barrier discharge lamp; and a determination operation of controlling ON/OFF of the switching element at a determination operation frequency (f2) higher than the steady-state operation frequency (f1), and the determination unit determines whether or not to stop the lighting operation based on the current or the voltage detected by the detector when the controller controls the switching element at the determination operation frequency (f2).

Methods and systems for producing a change in a medium. A first method and system (1) place in a vicinity of the medium at least one upconverter including a gas for plasma ignition, with the upconverter being configured, upon exposure to initiation energy, to generate light for emission into the medium, and (2) apply the initiation energy from an energy source including the first wavelength λ.sub.1 to the medium, wherein the emitted light directly or indirectly produces the change in the medium. A second method and system (1) place in a vicinity of the medium an agent receptive to microwave radiation or radiofrequency radiation, and (2) apply as an initiation energy the microwave radiation or radiofrequency radiation by which the agent directly or indirectly generates emitted light in the infrared, visible, or ultraviolet range to produce at least one of physical and biological changes in the medium.

Provided is a new light source device using an excimer lamp, particularly, a light source device for sterilization and deodorization. The light source device includes an excimer lamp and a flyback-type lighting device that supplies power to the excimer lamp. The lighting device includes a transformer, a switching element, and a control circuit that supplies a drive signal to the switching element. The control circuit controls the switching element on and off so that the switching frequency (FS) for the switching element at the time of starting to light is lower than the switching frequency (FO) at the time of steady-state lighting, and the ON-duty (TS) for the switching element at the time of starting to light is lower than the ON-duty (TO) at the time of steady-state lighting.

Provided is a new light source device using an excimer lamp, particularly, a light source device for sterilization and deodorization. The light source device includes an excimer lamp and a flyback-type lighting device that supplies power to the excimer lamp. The lighting device includes a transformer, a switching element, and a control circuit that supplies a drive signal to the switching element. The control circuit controls the switching element on and off so that the switching frequency (FS) for the switching element at the time of starting to light is lower than the switching frequency (FO) at the time of steady-state lighting, and the ON-duty (TS) for the switching element at the time of starting to light is lower than the ON-duty (TO) at the time of steady-state lighting.

Provided is a new light source device using an excimer lamp, particularly, a light source device for sterilization and deodorization. The light source device includes an excimer lamp and a flyback-type lighting device that supplies power to the excimer lamp. The lighting device includes a transformer, a switching element, and a control circuit that supplies a drive signal to the switching element. The control circuit controls the switching element on and off so that the switching frequency (FS) for the switching element at the time of starting to light is lower than the switching frequency (FO) at the time of steady-state lighting, and the ON-duty (TS) for the switching element at the time of starting to light is lower than the ON-duty (TO) at the time of steady-state lighting.

Provided is a new light source device using an excimer lamp, particularly, a light source device for sterilization and deodorization. The light source device includes an excimer lamp and a flyback-type lighting device that supplies power to the excimer lamp. The lighting device includes a transformer, a switching element, and a control circuit that supplies a drive signal to the switching element. The control circuit controls the switching element on and off so that the switching frequency (FS) for the switching element at the time of starting to light is lower than the switching frequency (FO) at the time of steady-state lighting, and the ON-duty (TS) for the switching element at the time of starting to light is lower than the ON-duty (TO) at the time of steady-state lighting.

A control circuit for an induction heating device includes a D.C. power supply, referenced to a ground connection and configured to supply power to the induction heating device. A switching device is configured to be selectively activated to control the induction heating device. The switching device is connected on one end to the ground connection. A resonant load is disposed between the D.C. power supply and the switching device, the resonant load including a capacitor and an inductor connected in a parallel configuration. At least one rectifying device is disposed in series with the resonant load and the switching device. The switching device is configured to control current from the D.C. power supply through the resonant load.

A discharge lamp drive device includes a discharge lamp driver adapted to supply a drive current to a discharge lamp having a first electrode and a second electrode, a control section adapted to control the discharge lamp driver, and a storage section adapted to store a plurality of drive patterns of the drive current. Each of the plurality of drive patterns has a plurality of drive parameters. The control section executes at least three of the drive patterns in a case in which drive power to be supplied to the discharge lamp is in a predetermined power band, and in a case in which an inter-electrode voltage of the discharge lamp is a predetermined voltage value. Any two of the at least three drive patterns are different from each other in a value of at least one of the plurality of drive parameters.

A light emission control device controls a first switching element of a light source circuit including a first resistor, a light emitting element, and the first switching element coupled in series between a first power supply node and a second power supply node set to a lower potential than the first power supply node. The light emission control device includes a second detection circuit that compares a first potential difference between both ends of the first resistor with a determination value, a light emission control circuit that outputs a first control signal that controls on/off of the first switching element, and a logic determination circuit that determines whether or not the first switching element is short-circuited. The light emission control circuit sets the first control signal to a first drive stoppage state that inactivates the first control signal, and when the second detection circuit has detected that the first potential difference is larger than the determination value, the logic determination circuit outputs an error signal.