Abstract: The invention discloses a light-emitting decoration which includes a main portion and an engagement portion. The engagement element is disposed on one side of the said main portion. The engagement portion comprises an extending portion to form a first accommodating space. The engagement portion comprises a gap to connect through the first accommodating space. Accordingly, while the light-emitting decoration is engaged with the subject object, the gap expends elastically for letting the subject object enter the first accommodating space through the gap.

Abstract: An improved puck light assembly comprised of a solar-powered puck light mounted in a bracket assembly, which may be securely attached to a structural mounting surface. The puck light device of the present invention is dimensioned to be a hand-held, self-contained, rechargeable, solar-powered lighting assembly. The puck light device of the present invention is mounted in a bracket assembly that allows the puck light to be both recharged and used without repositioning in the bracket assembly. In one embodiment, the bracket assembly comprises a fixed bracket assembly that includes a bracket mount for selectively attaching the bracket assembly to a smooth surface. In another embodiment, the bracket assembly comprises pivoting bracket assembly. The pivoting bracket assembly includes a receiver tray for holding the puck light device, a pivotally attached support bracket connected to a bracket mount for attaching the pivoting bracket assembly to a mounting surface.

Abstract: A light source causes hollow objects to glow in the dark (GID), thereby extending the operating period of light-activated materials in gazing globes and other decorative or ornamental objects. The light source may be provided as part of a conversion kit, enabling objects from different manufacturers to be converted to GID objects following purchase. A base unit includes the light emitter supported to illuminate the object from the inside out. The base unit further includes at least one solar panel facing into the interior of the object, and one or more batteries charged by the solar panel to power the light emitter. A device is used to couple the base unit to the rim of the object. In the preferred embodiment, the device for coupling the base unit to the rim of the object is an elastomeric ring that stretches over the rim of the object, thereby forming a seal.

Abstract: An emergency illumination device includes a housing. The emergency illumination device is arranged to include a light source and a power supply. The emergency illumination device further includes a motion detector to generate a motion signal when motion is detected. The emergency illumination device is arranged to switch on the light source when a motion signal is generated by the motion detector. The housing includes a first outer surface arranged to support the emergency illumination device when positioned on a bearing surface. The motion detector generates a motion detection plane that is substantially perpendicular with respect to the first outer surface.

Abstract: A structure of lighting device includes g a hood, a heat dissipater, at least one substrate board, and a fastener. The hood forms a receiving space, at least one fitting slot, and at least one heat dissipation opening. The fitting slot is located inside the receiving space. The heat dissipation opening is defined in a circumferential surface of the hood. The heat dissipater is received in the receiving space. The heat dissipater forms at least one guide section. The guide section opposes the fitting slot and is received in the fitting slot. The substrate board is electrically connected to at least one light-emitting diode. The substrate board is coupled to the heat dissipater. The heat dissipation opening allows for air circulation for removing heat generated by light-emitting diodes. Further, the heat dissipation opening is formed to have a width W less than 3mm, and the heat dissipater is arranged to be spaced from a circumferential surface of the hood by a distance greater than 6mm.

Abstract: A LED tube lamp includes a hollow heat sink, a cover fixed on the hollow heat sink, at least two LED substrates mounted on the hollow heat sink, a pair of connectors configured to connect to a coupling connector to electrically connect the LED tube lamp to a power source, and a driving circuit contained in the hollow heat sink. Each of the at least two LED substrates emit light in a different direction, enlarging the light divergence angle of the LED tube lamp.

Abstract: A light bar for use on firefighting or other emergency vehicles includes an elongate base that provides a versatile mounting platform for primary visual and audible warning devices as well as providing a mounting platform for other types of equipment such as secondary visual and audible devices, optical devices, cameras, weather monitoring equipment, GPS devices, preemption devices, running lights and other devices that have been traditionally mounted on a firefighting or emergency vehicle roof and/or other exterior surface area of the emergency vehicle. The light bar is versatile in both allowing many different types of equipment to be selectively mounted and adjustably positioned on the base, and on pairs of support plates that are attachable to the opposite ends of the base and provide support for different combinations of signal lights and other equipment.

Abstract: A plurality of light source sections each have a reflector and a light source that is a discharge lamp. The plurality of light source sections are in a positional relationship wherein all reflector center axes are orthogonal to each other and at least one reflector center axis is orthogonal to the optical axis of a projection optical system. Interchange means interchanges the locations of the plurality of light source sections when a light source section needs to be replaced. Reflection means guides, to a converging optical system, light from that light source section whose reflector center axis is perpendicular to the direction of gravity.

Abstract: The invention provides a carpet back lighting system comprising a carpet back lighting unit having a lighting unit front face and a unit back face, wherein the lighting unit front face comprises a light source, arranged to generate light, and an anti-slip coating. The back lighting system is suitable as back lighting at a carpet unit back side of a light transmissive carpet unit selected from the group consisting a light transmissive carpet and a light transmissive carpet tile.

Abstract: An LED conversion module for converting an incandescent work light to an LED work light includes an enclosure housing a plurality of LEDs, wherein at least a portion of the enclosure permits light generated from the LEDs to pass therethrough. A screw base is coupled to the enclosure and extends outwardly therefrom. The screw base provides electrical communication between the LEDs and a screw-type light socket disposed in a work light handle. A hook is coupled to the enclosure to facilitate hanging the LED conversion module and handle from a support structure.

Abstract: A LED luminaire includes a body portion having a lighting module and an optical structure formed integrally with the body portion. The optical structure is formed within the body portion and located in a light-projection direction of the lighting module. The optical structure substantially is a sheet-like structure with a first surface and a second surface. The first surface has at least two side portions with a first curvature, and the second surface has a second curvature. The first curvature is greater than the second curvature. Thereby, the view angle of the light is increased as the light generated from the lighting module passes through the optical structure.

Abstract: In various embodiments, a semiconductor lamp may include at least one semiconductor light source; a heat sink for cooling at least the at least one semiconductor light source; and a diffuser fixed to the heat sink; wherein the heat sink has at least one receptacle space; wherein the receptacle space is filled with solid filling compound; and at least one part of an edge of the diffuser is dipped into the filling compound in a positively locking manner.

Abstract: The invention relates to a reflector unit and a lighting device (1) having a plurality of light sources (4) and a reflection arrangement, with the light sources (4) being positioned in front of a reflection surface of the reflection arrangement, with the light beam from the light sources (4) being deflected by reflection to the main emission direction of the lighting device (1) via the reflection arrangement. According to the invention, a first reflection section (2) and a raised second reflection section (5) are provided, with the first and the second reflection sections being matched to one another such that a main light beam can be produced, in that the light from the light sources (4) first of all strikes the second reflection section (5), and then the first reflection section (2), and leaves the lighting device in the main emission direction.

Abstract: A light panel is disclosed. The light panel comprises a circuit assembly, a plurality of light sources, a light reflective structure, and a diffuser layer. The light reflective structure has a plurality of concaves, which are continuously connected to form a plurality of ridges. Each of the concaves has an opening formed on the bottom surface thereof, and each of the light sources is disposed corresponding to each of the openings of the concaves. The diffuser layer is supported by the ridges of the light reflective structure. In some aspects of the present invention, the diffuser layer may have a sloping inner surface or is coated with patterned diffuser coatings on the top surface. Each light source can be added with a lens.

Abstract: An outdoor area light has a housing, a light source comprised of a printed circuit board, a plurality of LEDs, and a heat sink. The heat sink is disposed in thermally conductive proximity to said light source to conduct heat away from it for temperature control. The light source and heat sink are mounted in the housing. A passive impeller is mounted on the housing. A separate active impeller is also mounted on the housing. A conduit for air is in fluid communication with the active impeller and disposed to direct cooling air over the light source and/or the heat sink. The printed circuit board and/or the heat sink and/or their mounts have holes through them. The holes define fluid throughways disposed to convect heat away from the light source via air moving through the throughways. The fluid throughways may be sufficiently aligned to establish laminar flow through them. In high heat, the active impeller is engaged to cool the light; otherwise the passive impeller keeps the light cool.

Abstract: An electric fire is described which include a flame effect generator provided forwardly of a screen and configured to provide for generation of flame effect on the screen.

Abstract: An optical light emitting device comprises a circuit substrate having a plurality of LED lamps arranged as an array; a plurality of optical lenses correspondingly installed to light extraction portions of the plurality of LED lamps, the optical lens having a platform that is equipped with an incident concave surface for containing the LED lamp, a light extracting convex surface disposed to a corresponding exterior end of the incident concave surface; and a reflector having a plurality of containing holes arranged as an array capable of corresponding to the LED lamps array of the circuit substrate, each containing hole provided for fitting the light extracting convex surface of the optical lens, expansion inclined planes with an upper-wide and lower-narrow shape disposed to a periphery of the containing hole, the platform of the optical lens leaning against a frame border of the containing hole.

Abstract: A light bulb includes a bulb body, two electrodes, and a light-transmissible conductive film. The two electrodes are connected to the bulb body. The light-transmissible conductive film covers the bulb body. A lighting fixture includes a lampshade, a cover, and a light-transmissible conductive film. The lampshade has an opening. The cover covers the opening. The light-transmissible conductive film is configured to be attached to the lampshade and the cover.

Abstract: In at least one embodiment, the light guide (10) comprises a single-pieced light guide body (1). The light guide body (1) includes a transparent material and a light entrance segment (2) having a first cross-section (11) with a polygonal shape. Furthermore, the light guide body (1) includes a light output segment (4) having a second cross-section (22) with a rotund, round, circular, oval or elliptic shape. A transition segment (3) is arranged adjacent to and between the light entrance segment (2) and the light output segment (4). Along the transition segment (3), the first cross-section (11) in particular continuously changes to the second cross-section (22).

Abstract: A light guide includes a core made of material having translucency and an optical path conversion mirror for reflecting the signal light from the optical element and converting the optical path of the signal light formed on at least the core. The signal light is transmitted through the core by the reflection at the optical path conversion mirror. The optical path conversion mirror surface has an inclination angle ? formed with a bottom surface of the core changing in the X-direction in a cross-sectional shape in which the core is cut at a YZ plane, the Y-direction being an optical axis direction of the optical element, the Z-direction being an advancing direction of the signal light of the light guide, and the X-direction being a direction perpendicular to both the Y-direction and the Z-direction.

Abstract: An apparatus and related method for housing a light assembly apparatus includes a housing having a housing first end and a housing second end arranged along a central axis, the housing further includes a plurality of fins each having a fin first end and a fin second end, the plurality of fins forming a plurality of vents therebetween, each the plurality of fins has a curvature extending from the fin second end such that the plurality of fins converge towards the central axis proximate each fin first end, an endpiece proximate the housing first end and arranged proximate to the fin first end of each of the plurality of fins, the endpiece having a circular portion including a continuous circumference about the central axis, an electrical connector arranged proximate to the endpiece and arranged along the central axis, and a space arranged along the central axis proximate the housing second end and further configured with the plurality of fins and the plurality of vents arranged therearound, the space configured

Abstract: A non-opaque junction box cover and troubleshooting electronic circuit board are described. The circuit board has one or more light sources. At least one of the light sources is configured to emit light if power is present at a specific terminal stud within the junction box. The non-opaque junction box cover transmits this light, allowing one to troubleshoot a problem in a vehicle's electrical system without opening the junction box. In one embodiment, the circuit board has holes that align with the terminal studs in the junction box. The holes allow the circuit board to connect to the terminal studs physically and electrically without additional fasteners and wires. In another embodiment, the circuit board is coupled to the non-opaque junction box cover. Proper alignment between the non-opaque junction box cover and the circuit board ensure proper electrical contact between the circuit board and the terminal studs.

Abstract: An angle adjusting mechanism for a streetlamp includes a housing connected with a lamp, and an angle positioning board and a lamppost sleeve installed in the housing. The angle positioning board has a first positioning hole and a plurality of second positioning holes. The lamppost sleeve has a first positioning tube and a second positioning tube. Through pre-arranging corresponding angles of the angle positioning board and the lamppost sleeve, the illumination angle of the lamp is capable of being adjusted. Moreover, the lamppost sleeve and the angle positioning board are fastened by screws, so the illumination angle of the lamp and the housing can be rapidly adjusted through loosening or fastening the screws.

Abstract: A multi-workstation for use in a work area of a garage having a vertically oriented pole with an upper end and a lower end and a light fixture mounted between the upper end and the lower end of the vertically oriented pole. The light fixture is capable of sliding up and down along the pole, rotating about an axis that is perpendicular to the axis of the pole, moving horizontally toward and away from the pole, and rotating about an axis that is perpendicular to the axis of the pole. Locking means is provided to lock the light fixture at a desired height and angle relative to the pole and mounting means is provided to hold the pole in a vertical position.

Abstract: The present invention concerns itself with a floor top holder for a device such as a tablet computer, comprising a floor base, a post, and one, two or more flexible tubes as a support and as a position adjustment mechanism. A wall version of the device holder is also the object of the present invention. Furthermore, the device holder invented can be easily converted from a floor base version to a wall, desk, or table top version.

Abstract: A vehicle includes a wheel and a vehicle body that is supported by the wheel for travelling on a riding surface. The vehicle also includes a light emitting device that is mounted to one of the wheel and the vehicle body. The light emitting device is operable to emit light toward the riding surface to create a defined image on the riding surface.

Abstract: An adaptive forward lighting system for a vehicle includes an imaging sensor and a control. The imaging sensor includes a two-dimensional array of light sensing photosensor elements, and monitors a scene forward of the direction of travel of the vehicle. The control processes image data from the imaging sensor. Adjustment between a first beam pattern and a second beam pattern of a headlamp of the vehicle is responsive, at least in part, to the processing of the image data. The control may receive vehicle data via a vehicle communication bus, and may adjust between a first beam pattern and a second beam pattern of a headlamp of the vehicle responsive, at least in part, to the vehicle data. The control may process image data to determine, at least in part, a presence, location or characteristic of an object of interest in the forward field of view of the imaging sensor.

Abstract: A lighting module having a flat light emitter, a reflector (R1) determined so as to create, in a plane comprising the emitter, a hot spot (S) limited by a control curve (A) contained in the plane comprising the first emitter and constituting the front or rear edge of the spot and a lens (L) determined and arranged with the reflector so as to form the first cutoff beam.

Abstract: A vehicular lamp includes a light source disposed on an optical axis extending in a front-back direction of the vehicular lamp; and a reflector that reflects forward light from the light source. The reflector is formed by a translucent member including a plurality of optical elements disposed continuously in a radial direction of the optical axis. Each of the optical elements includes: a surface of incidence through which light from a light emission reference point in the light source is incident into the optical element and which refracts the light into a direction away from the optical axis, a reflective surface which internally reflects forward the light which is incident into the optical element through the surface of incidence, and a surface of emission through which the light internally reflected by the reflective surface is emitted forward from the optical element.

Abstract: In a vehicular lamp, a first zone includes a first incident portion disposed on a radiation axis. A first light guide portion guides light incident from the first incident portion forward. A first radiation portion formed from a first concave surface and a second concave surface deflects the light from the first light guide portion toward a lamp optical axis side and radiates such light forward in a diffused manner. A second zone includes a cylindrical second incident portion disposed on an outer side of the first incident portion. A second light guide portion that is longer in the direction of the radiation axis than the first light guide portion guides light incident from the second incident portion forward. A cylindrical second radiation portion radiates the light from the second light guide portion forward.

Abstract: The present invention discloses a moving head light included a light sources group having a plurality of light sources, a reflector group slantwise arranged at a circumference of the light sources group; and an angle-adjusting device for adjusting the relative angles between the reflectors and the light sources. Each reflector corresponds to each light source one by one, and the reflector group includes a plurality of reflectors. The present invention uses the angle-adjusting device to adjust the relative angles between the reflectors and the light sources so that lights sent out from the light sources generate a special effect of scaling in a space after being reflected by the reflectors, therefore, the stage rendering effect is good to make persons feel mystery and fantasy.

Abstract: A display and illumination system includes a light source section accommodating a light source; an optical fiber for transmitting light from the light source; a display illumination unit radiating light transmitted by the optical fiber; a light source module installed in the light source section, accommodating the light source, and optically connected to the optical fiber; a plug electrode installed in the light source module and supplying electric power to the light source; a convex portion on a first side of the light source module, engaging the optical fiber, and extracting light from the light source; and a concave portion located opposite the first side of the light source module and urging the convex portion toward the optical fiber with a constant force.

Abstract: An optical fiber teeth illumination apparatus comprises a handle and a treatment device. The handle has a hollow lighting section at a front end to hold a lighting element and at least one optical fiber. The lighting element is connected to a power source. The lighting section has at least one aperture. The lighting element and the optical fiber are interposed by a condensing light element which focuses light generated by the lighting element on an input end of the optical fiber. The optical fiber has at least one output end facing the aperture to project the light outside. The treatment device is fastened to the front side of the lighting section. Thus dentists can correctly inspect ailing portion and perform treatment without holding a lighting device, and overcome the problem of holding multiple tools such as an oral mirror, lighting device and treatment apparatus at the same time.

Abstract: In an LED device, a light guide array is disposed between a planar LED array light source and a curved housing. A first surface of the light guide array is a plane evenly distanced from the LED array and a second surface of the light guide array is a curved surface evenly distanced from the curved housing. A plurality of guiding channels, either one-to-one or one-to-many to the LED, are aligning along each light axis of the LED in the light guide array, whose reflective surface allows the lights emitted by each LED to reflect thereon and emit from the second surface and simulate a curved light source having substantially the same shape as the curved housing.

Abstract: The system and method of the present invention advantageously enable controllable light extraction from optical fiber waveguides and offer highly configurable light signal guidance and control capabilities, as well as additional advantageous features associated with waveguides, by providing, in various exemplary embodiments thereof, a multitude of novel techniques by which the parameters relating to utilization of various light signals (such as direction of their emission, magnitude of the emission, physical surface area of the emission, etc.), can be readily controlled and configured as a matter of design choice. Additionally, the inventive system and method, in various exemplary embodiments thereof, also enable and facilitate selective configuration of, and/or control over, various characteristics of the light signals guided/controlled/extracted thereby, such as the signals' wavelength, polarization, intensity, amplitude, etc.

Abstract: A fluid-handling optical system such as a light-pipe assembly of a GC/FTIR apparatus includes a light pipe 10, preferably of gold, surrounded by a body 9. The body is of a material where the linear thermal expansion coefficient differs very little from that of the pipe 10. Thus they can sealingly abut a non-resilient end abutment, e.g. involving a gold disc 4.

Abstract: An LED backlight module includes at least one LED and a light guide plate. The light guide plate includes a light incident surface, a light emitting surface connected to the light incident surface, and a bottom surface parallel to the light emitting surface. The at least one LED is placed on the light incident surface and spaced at regular intervals. The light from the at least one LED enters the light guide plate from the light incident surface and is reflected to the light emitting surface by the bottom surface. The light guide plate defines a plurality of concave dots on the bottom surface. The bottom surface is divided into a plurality of discontinuous dot zones. In the dot zone closest to the incident surface, proximity of the dot to the LED decreases the depth and the distribution density of the dots.

Abstract: A backlight unit is disclosed. The backlight unit includes a light emitting device module, a reflective plate including at least two slopes configured to reflect light emitted from the light emitting device module to an optical member, and the optical member to transmit the light directed from the light emitting device module and the reflective plate. The slope located farther from the light emitting device module has a greater gradient with respect to a horizontal plane than the slope located closer to the light emitting device module.

Abstract: A light guide unit having a planar portion, a first curved portion, and a second curved portion are disclosed. The first curved portion has a first optical surface, a second optical surface, and a light incident surface connecting the first and the second optical surfaces. The planar portion has a first and a second surfaces, respectively, connected to the first and the second optical surfaces. Absolute values of slopes of the first and second optical surfaces with respect to the first and second surfaces gradually increase near to the light incident surface, respectively. The planar portion connects the first and the second curved portions having a third surface and a third optical surface, and the second surface connects the second and the third optical surfaces. An absolute value of a slope of the third optical surface with respect to the second surface gradually increases away from the first surface.

Abstract: The present invention relates to a technique which can make a backlight used in a liquid crystal display device thin and light-weighted. The present invention provides a liquid crystal display device which includes a display panel and a backlight which is arranged behind the display panel, wherein the backlight includes a film-like light guide member, a film-like light semi-transmissive member which is adhered to a first surface of the light guide member which faces the display panel in an opposed manner, a film-like reflective member which is adhered to a back surface of the light guide member opposite to the first surface, and a spot light source which is arranged at a position of the light guide member at which light is incident on the light guide member from the first surface or the back surface, and a refractive index of the light semi-transmissive member is set smaller than a refractive index of the light guide member.

Abstract: A backlight unit capable of emitting heat smoothly and a display device including the same are disclosed. The backlight unit includes a bottom cover, a light emitting module arranged in a predetermined area of the bottom cover, a reflective sheet provided on the bottom cover, the reflective sheet spaced apart a predetermined distance from the bottom cover, a plurality of first heat radiating members provided between the reflective sheet and the bottom cover, the plurality of the first heat radiating members spaced apart a predetermined distance from each other, a second heat radiating member arranged between the light emitting module and the first heat radiating members, and a projected part located in the second heat radiating member below the reflective sheet, the projected part supporting the reflective sheet to locate the reflective sheet spaced apart a predetermined distance from the first heat radiating members.

Abstract: There is provided a backlight unit. The backlight unit includes a light guiding plate, a light source module including a substrate provided with a circuit wiring and a plurality of light emitting diode (LED) blocks each including one or more LED mounted on the substrate to be positioned vertically with respect to the substrate, the one or more LED being disposed to face a side surface of the light guiding plate, a bottom chassis including a base and a sidewall upwardly extending from a circumference of the base, and accommodating the light source module and the light guiding plate in such a manner that the one or more LED is disposed to be adjacent to the sidewall, and a driving unit controlling a current signal applied to each of the plurality of LED blocks to thereby control brightness for each LED block.

Abstract: A projecting part (4) is provided on at least one of a reflection sheet (3), which is provided so as to cover a surface facing an emission surface (1c) of a light guide (1), and a light guide section (1a) of the light guide (1) so that a space is secured at least partially between the light guide section (1a) and the reflection sheet (3). This makes it possible to provide an illumination device which (i) has a reduce thickness, (ii) achieves high light use efficiency, and (iii) can carry out a local dimming.

Abstract: An integrated light guide plate and a backlight unit including the same. The integrated light guide plate includes a light guide plate, which forms planar light by guiding light, and a reflecting mirror, which is integrally formed on an underside of the light guide plate. The reflecting mirror reflects light that has downwardly passed through the light guide plate so that the light is introduced again into the light guide plate. The reflecting mirror includes a buffer layer, which is formed on the underside of the light guide plate, and a reflecting layer, which is formed on an underside of the buffer layer. The reflecting layer reflects light that has downwardly passed through the light guide plate so that the light is introduced again into the light guide plate. A protective layer is formed on an underside of the reflecting layer, and protects the reflecting layer.

Abstract: A capacitor circuit includes a first capacitor line including a film capacitor and a second capacitor line including a ceramic capacitor that are connected in parallel with each other. The second capacitor line includes an inductance element that is connected in series with the ceramic capacitor. The inductance element is set to a value such that a series resonant frequency of the first capacitor line and a series resonant frequency of the second capacitor line are matched.

Abstract: A high voltage transformer for transforming electric power from a high voltage direct current source to a lower voltage direct current or to a lower voltage alternating current, without intermediate magnetic transformation. The transformer has a number of stages. Each stage includes capacitors and switching devices. There is a controller that controls the switching devices to change the polarity of one or more capacitors.

Abstract: A resonant conversion system is provided, in which a resonant converter receives an input voltage to generate an output voltage, and a buck converter provides the input voltage of the resonant converter, and controls the input voltage to perform an over-current protection process.

Abstract: A driving circuit includes a generator configured to generate a driving signal having plural levels of voltage at which a power switching device is turned on. The driving circuit also includes a switching controller configured to switch between the plural levels of voltage at which the power switching device is turned on. The driving circuit further includes a load current detector configured to output a load current detection signal to the switching controller, the load current detection signal indicating whether or not a current flowing through the power switching device exceeds a threshold, wherein the switching controller is configured to perform the switching based on the load current detection.

Abstract: A multi-winding high step-up DC-DC converter includes a three-winding transformer to transform a low DC voltage to a high DC voltage; a power switch to control the energy flux of the primary winding of the three-winding transformer based on turning on/off the power switch; a first diode to control the current of the first secondary winding of the three-winding transformer; a second diode to control the current of the second secondary winding of the three-winding transformer; and a third diode to control the current of the primary winding. When the DC-DC converter is in the first operation state, the switch and the second diode are in on state, and the first and the third diodes are in off state. When the DC-DC converter is in the second operation state, the switch and the second diode are in off state, and the first and the third diodes are in on state.

Abstract: In an ON/OFF type isolated DC-DC converter that stores electromagnetic energy in a main transformer during an ON period of a power switch and releases the electromagnetic energy to an output during an OFF period of the power switch, high-speed, highly stable output voltage control without the need for a photocoupler, for which the allowable temperature range is relatively narrow and the current transfer ratio changes over time, is performed. An integrating circuit including a resistor and a capacitor generates a ramp wave, and the ramp wave is superposed on a reference voltage of a reference voltage source Vref through a capacitor. A comparator compares a voltage Vo that is proportional to an output voltage of a converter with the reference voltage on which the ramp wave has been superposed, and transmits an inversion timing signal through a pulse transformer.