Abstract: This straight tube LED illumination lamp includes the following: an LED element; a first plug having an input-output terminal and an empty terminal; a second plug having an input-output terminal and an empty terminal; a first rectifier that is connected to the input-output terminal of the first plug and the empty terminal of the second plug in order to convert alternating current to direct current; a second rectifier that is connected to the input-output terminal of the second plug and the empty terminal of the first plug in order to convert alternating current to direct current; and a bypass circuit through which current is flown back from either the first or second rectifier to the other rectifier. The bypass circuit has a current-limiting resistor to prevent the first and second rectifiers from being damaged.

Abstract: An electrical appliance, particularly a television or a monitor, having a lighting device (8) having light emitting diodes (12). The light emitting diodes (LED) (12) are collected in LED strings (11) and controlled by a balancing network (17). The balancing network (17) has a circuit branch (19) for each string (11), the circuit branches (19) being connected in parallel to each other. Disposed in each circuit branch (19), is a bridge rectifier (20) to which the LED string (11) is connected. Moreover, each circuit branch has a balancing transformer (23), wherein all the secondary windings (26) of the balancing transformer (23) are connected in series in a closed conductor loop (27), by which the currents in all circuit branches are balanced.

Abstract: A sensing device includes a sensing transmitting module and a sensing receiving module respectively mounted in a first housing and a second housing. And an output terminal of the sensing transmitting module and an input terminal of the sensing receiving module are provided with a sensing coil and an electromagnetic rod respectively, the first housing and the second housings are cooperated with each other, and the electromagnetic rod is inserted into the sensing coil, so that the sensing coil or the electromagnetic rod is placed in magnetic field generated by the electromagnetic rod or the sensing coil thereby generating sensing voltage. The sensing parts are formed of the sensing coil and the electromagnetic rod, which significantly reduces the amount of the copper wires in the sensing coil and the electromagnetic rod, therefore the sensing device has a smaller size, lighter weight and lower cost.

Abstract: A light emitting diode current-balancing driving circuit is provided. In accordance with the first aspect of the present invention, a light emitting diode current-balancing driving circuit is provided. The light emitting diode current-balancing driving circuit includes a plurality of rectifiers; a current-balancing circuit having a plurality of capacitors respectively coupled to the plurality of rectifiers; and a plurality of diodes electrically connected to the plurality of rectifiers respectively.

Abstract: A light driving apparatus includes a first rectifying unit for receiving AC power and rectifying the AC power into DC, a switching element controlled to turn on or off by a control signal, a transforming unit having a transformer and an inductor connected to a primary side of the transformer in parallel, a second rectifying unit for rectifying a secondary side output of the transforming unit and supplying an output voltage thereof to a LED unit, and a control unit provided in the primary side to give a constant-current control function so that a secondary side output is maintained consistently. According to the present disclosure, it is possible to simplify the circuit structure of the secondary side and improve the efficiency by controlling the secondary side current at the primary side without secondary side feedback information.

Abstract: According to one embodiment, a power supply for lighting includes a rectifying circuit, a smoothing capacitor, and a current control circuit. The rectifying circuit rectifies a phase-controlled alternating-current voltage supplied to between a pair of input terminals. The smoothing capacitor is connected to a high-potential terminal and a low-potential terminal of the rectifying circuit. A first electric current flows to the current control circuit in a period when an absolute value of the alternating-current voltage is lower than a specified value. After a second electric current larger than the first electric current flows when the absolute value of the alternating-current voltage increases to be equal to or larger than the specified value, the current control circuit is shut off to reduce a current value to be smaller than the second electric current until the absolute value of the alternating-current voltage decreases to be lower than the specified value.

Abstract: The voltage detection module according to the invention comprises: a first electric terminal; a second ground terminal; a load resistor, connected to the first electric terminal; a main gas-filled spark gap, arranged in series between the load resistor and the second terminal; and a main capacitor, connected, on the one hand, to a first middle point situated between the load resistor and the main gas-filled spark gap and, on the other hand, to the second terminal. The voltage detection module also comprises a light source connected in series between the main gas-filled spark gap and the second terminal, the light source and the main gas-filled spark gap being separate from one another. The voltage detection module comprises an additional stage capable of limiting the voltage applied to the terminals of the gas-filled spark gap to a threshold voltage chosen so as to prevent the gas-filled spark gap from always being on.

Abstract: A bi-level lamp ballast to selectively operate two lamps is provided. The ballast includes a control circuit having an input, connected to a switching network, and an output, which provides a particular control signal based on the state of the switching network. The ballast also includes respective lamp control switches, each having respective outputs. The first switch is connected to the output and a ballast power supply. In its first state, it connects the ballast power supply to its first output, and in its second state, it connects the ballast power supply to its second output. The second switch is connected to the output and a ground. In its first state, it connects the ground to its first output, and in its second state, it connects the ground to its second output. The state of each lamp control switch depends on the control signal generated by the control circuit.

Abstract: A capacitor is connected between direct current voltage terminals, and inductance means is connected between one end of the capacitor and one of load terminals. In a case in which the direct current voltage exceeds a set value, voltage at both ends of the capacitor is shared by the first and second switching elements that are not electrically conductive; in a case in which the direct current voltage is below the set value, the first and second switching elements are electrically conductive on a periodic basis or as needed to output reversed-polarity voltage between load terminals; and in a case in which the first and second switching elements are turned off, voltage at both ends of the capacitor restricts voltage applied to both ends of the first and second switching elements, during a period in which the first and second feedback rectifier elements are electrically conductive.

Abstract: A piezoelectric resonant LED driving circuit, wherein a rectifier is used to rectify an AC voltage provided by the supply main into a DC voltage. Then, a quasi-resonant switching module performs resonance by means of the DC voltage to produce an induced current, to raise resonance frequency to operation frequency of a piezoelectric oscillator. Finally, the piezoelectric oscillator performs resonance and filtering using the induced current, to generate a sine wave current. Then, the sine wave current is rectified to output a DC current to drive an LED module.

Abstract: Provided are an energy harvesting device capable of generating electric energy by effectively obtaining an electromagnetic wave emitted from an indoor lighting device and a power control system of a lighting device capable of performing self-power generation by using the energy harvesting device as a power source. The energy harvesting device using an electromagnetic wave according to an exemplary embodiment of the present disclosure includes: an interface unit made of a conductive material and configured to capture a conductive interference signal transferred through a conductive member of a lighting device; and a rectifier circuit unit configured to rectify the captured conductive interference signal to convert the rectified conductive interference signal to direct current power.

Abstract: Certain embodiments provide an LED lighting equipment including a lighting main body. An LED power device has a DC power source and a DC-DC converter having an input terminal connected to the DC power source and the DC-DC converter having an output terminal. An LED light source has a board and a plurality of LED packages; each including a plurality of LED chips connected in series. The LED packages are mounted on the board and connected in series to the output terminal of the DC-DC converter.

Abstract: A switching power supply includes a transformer, a resonant capacitor, a pair of switching elements, an inductor, and a rectifying element. The transformer includes a first winding, a second winding, and a third winding. The resonant capacitor is connected to both ends of the first winding. The switching elements are normally-on elements and alternately turned off according to a voltage induced in the third winding. Each of the switching elements includes a first main terminal, a second main terminal, and a control terminal. The inductor supplies a direct-current power supply voltage between the middle point of the first winding and the each first main terminal of the switching elements. The rectifying element rectify a voltage induced in the second winding.

Abstract: A driving circuit includes a converter, a transformer, a first sensor and a second sensor. The converter is coupled to a switch that operates in a first state or in a second state. The converter receives an input voltage and provides a regulated voltage. The transformer transforms the regulated voltage to an output voltage to power said LED light source. Both a first current through the converter and a second current through the transformer further flow through the switch when the switch operates in the first state. The first sensor coupled between the switch and a first reference node provides a first sense signal indicating a combined current of the first current and the second current. The second sensor coupled between the first reference node and a second reference node provides a second sense signal indicating only the second current.

Abstract: A light system that is controllable to generate a plurality of selected lighting effects, the light system includes a main processor, the main processor being in communication with a plurality of light sources; and each of the plurality of light sources having a distinct, known address whereby one of more of the light sources are individually addressable by the main processor, a known address being received by a selected light source of the plurality of light sources and acting to set the selected light source of the plurality of light sources in a disposition to receive a subsequent command from the main processor for generating a selected lighting effect. A light source and a method of forming a light system are further included.

Abstract: A fluorescent tube driving device including a first voltage converter, a second voltage converter, an oscillating unit, an inverter, an adjusting unit, a switching unit and a voltage stabilizing unit is provided. The first and the second voltage converters convert an alternating-current (AC) voltage to a first direct-current (DC) voltage and a second DC voltage. The oscillating unit is charged by the first DC voltage to generate a charging voltage and a trigger signal. The adjusting unit is charged by the charging voltage to generate a power supply signal. The switching unit transmits the second DC voltage according to the power supply signal. The voltage stabilizing unit stabilizes the voltage from the switching unit. Both of the oscillating unit and the adjusting unit are charged at a delay speed to synchronously transmit the operation voltage and the trigger signal to a controller in the inverter.

Abstract: The present invention relates to an SCR dimming circuit and method for regulating the luminance of an LED load. In one embodiment, an SCR dimming circuit can include: an SCR element that generates a lack-phase AC voltage based on a sinusoidal AC supply; a rectifier bridge that generates a lack-phase DC voltage based on the lack-phase AC voltage; a conduction angle generator that receives the lack-phase DC voltage, and generates a controlling signal representative of a conduction angle of the SCR element; and a dimming signal generator that generates a dimming signal to regulate luminance of the LED load, where the dimming signal generator receives the controlling signal, an adjustable signal, and a clamping voltage, an amplitude of a dimming phase angle range is selected by a fixed signal determined by the clamping voltage, and the dimming phase angle range may be shifted by regulating the adjustable signal.

Abstract: The present invention of a reverse polarity series type LED is formed by two sets of LED and diode assemblies in reverse polarity series connection wherein the first set is consisted of at least one or multiple homopolar series or parallel connected or series and parallel connected LEDs, and the second set consisting of at least one or more homopolar parallel or series connected or series and parallel connected LEDs for further connection to the drive circuit formed by current-limiting impedance and/or power storage and discharging devices and/or voltage-limit circuit devices in order to produce the required operational characteristics.

Abstract: A light emitting diode (LED) device comprises a base and a cover packaging of a rectifier diode chip and a light emitting diode chip connecting in series with a metal wire. The LED device can be plugged directly into the socket of the LED light string without any other external rectifier circuits. Moreover, the device has advantages of small size, easy-to-use and easy-to-change. By adopting different connection methods with the LED device, it can achieve anticipative functions, such as half-wave, full-wave and bridge rectifier, etc.

Abstract: There is provided an inverter for controlling a backlight using a variable frequency oscillator, the inverter including: a variable frequency oscillator generating a reference waveform having a variable frequency through voltage charged in a first capacitor and voltage discharged therefrom by a current; and a main switching signal generator generating a switching signal for driving a plurality of lamps based on a first error voltage between output voltages corresponding to currents flowing in the lamps and a first reference voltage and the reference waveform, whereby damage of circuit elements such as the lamps, or the like, may be prevented and the brightness of the lamps may be constantly maintained.

Abstract: Circuits to make a 3-way LED light bulb correctly interface to a standard 3-way light socket, producing three levels of light corresponding to the three settings of the socket. One of the circuits prevents color shift due to varying LED current.

Abstract: The voltage detection module according to the invention comprises: a first electric terminal; a second ground terminal; a load resistor, connected to the first electric terminal; a main gas-filled spark gap, arranged in series between the load resistor and the second terminal; and a main capacitor, connected, on the one hand, to a first middle point situated between the load resistor and the main gas-filled spark gap and, on the other hand, to the second terminal. The voltage detection module also comprises a light source connected in series between the main gas-filled spark gap and the second terminal, the light source and the main gas-filled spark gap being separate from one another. The voltage detection module comprises an additional stage capable of limiting the voltage applied to the terminals of the gas-filled spark gap to a threshold voltage chosen so as to prevent the gas-filled spark gap from always being on.

Abstract: A cathodoluminescent lighting system has a light emitting device having an envelope with a transparent face, a cathode for emitting electrons, an anode with a phosphor layer and a conductor layer. The phosphor layer emits light through the transparent face of the envelope. The system also has a power supply for providing at least five thousand volts of power to the light emitting device, and the electrons transiting from cathode to anode are essentially unfocused. Additional embodiments responsive to triac-type dimmers with intensity and color-changes in response to dimmer control. A power-factor-corrected embodiment is also disclosed.

Abstract: A driving circuit for a T8 light-emitting diode (LED) lamp mainly includes two bridge rectifiers. According to the electrical characteristics and the circuit designs of the bridge rectifiers, the T8 LED lamp can be driven to illuminate by the driving circuit while a starter needs not be removed from the T8 lamp holder.

Abstract: The present invention discloses a decorative light string device, which comprises: a power plug receiving AC power, a tail socket coupled to the power plug, and a LED string with one end thereof coupled to the power plug and the other end thereof coupled to the tail socket, wherein each of the power plug and tail socket has a diode and a capacitor coupled to the diode, whereby a DC voltage, which is twice the peak voltage of the AC power, is output to the LED string.

Abstract: The present invention provides a method and apparatus for driving multiple parallel discharge lamps, which increases the switching frequency once the open lamp condition is detected to provide an output voltage that is high enough to ignite the lamp again.

Abstract: A capacitor is connected between direct current voltage terminals, and inductance means is connected between one end of the capacitor and one of load terminals. In a case in which the direct current voltage exceeds a set value, voltage at both ends of the capacitor is shared by the first and second switching elements that are not electrically conductive; in a case in which the direct current voltage is below the set value, the first and second switching elements are electrically conductive on a periodic basis or as needed to output reversed-polarity voltage between load terminals; and in a case in which the first and second switching elements are turned off, voltage at both ends of the capacitor restricts voltage applied to both ends of the first and second switching elements, during a period in which the first and second feedback rectifier elements are electrically conductive.

Abstract: The present invention is disclosed by that the series connected capacitive impedance and inductive impedance are powered by a pulsed power, thereby to produce the bi-directional divided power in series resonance at each impedance, and be rectified by a rectifier device to provide DC power output to drive the unidirectional conducting light emitting diode.

Abstract: A light system that is controllable to generate a plurality of selected lighting effects, the light system includes a main processor, the main processor being in communication with a plurality of light sources; and each of the plurality of light sources having a distinct, known address whereby one of more of the light sources are individually addressable by the main processor, a known address being received by a selected light source of the plurality of light sources and acting to set the selected light source of the plurality of light sources in a disposition to receive a subsequent command from the main processor for generating a selected lighting effect. A light source and a method of forming a light system are further included.

Abstract: A dielectric barrier discharge lamp (14) has an inside electrode (142) in a tube axis direction within the airtight container (141), which has ultraviolet transmission properties and a long tube shape, and an outside electrode (143) having a semicircular shape arranged outside of the airtight container (141) in close contact with it. Besides, an excimer-forming gas is sealed in the airtight container (141). AC voltage supplied from the power source (11) is converted into DC voltage through a converter (12) and outputted. A high-frequency wave is generated by an inverter (13) based on the DC voltage supplied from the converter (12), and a dielectric barrier discharge is induced in the dielectric barrier discharge lamp (14) to irradiate ultraviolet rays. The converter (12) is configured by connecting in series the outputs of DC power sources (121), (122).

Abstract: A method includes rectifying AC power and controlling switching of first, second and third currents from and rectified power and a switching sequence that is locked to the AC cycle time by sensing an amplitude of at least one of the AC power and the rectified power. The first, second and third currents are conducted through corresponding first, second and third series of color light emitting devices of different colors. The switching sequence repeats at least twice each AC cycle time.

Abstract: A circuit arrangement for starting a high-pressure discharge lamp (LA), having a main combustion chamber (HaBk) with a first and a second main electrode (HaE1, HaE2) and an auxiliary combustion chamber (HiBk), comprising: an inverter (10), which has at least one first and one second electronic switch (S1, S2, S3, S4) and one first and one second output terminal (WA1, WA2); a drive circuit (12) for driving the electronic switches (S1, S2, S3, S4) of the inverter (10); and an auxiliary starting circuit (14).

Abstract: An LED light string employs a plurality of LEDs wired in block series-parallel, where the one or more series blocks, each driven at the same input voltage or rectified AC input voltage as the source voltage (110 VAC or 220 VAC), are coupled in parallel. This voltage matching requirement for direct AC drive places fundamental restrictions on the number of diodes on each diode series block, depending on the types of diodes used. The same method that apply to matching the sum of the LED lamps (VAC values) to the AC input, or applied voltage in an AC circuit apply to matching the sum of the LED lamps (VP values) to the full-wave or half-wave rectified AC (VP) voltage applied. Filtering capacitors may also be employed.

Abstract: A three-level dimming circuit for a discharging lamp includes a first contact, a second contact, and a third contact, a first full-wave rectification circuit connected to the first contact and the third contact, and a second full-wave rectification circuit connected to the first contact and the second contact. A selection circuit includes three resistors and a first electrical controlled switch. A half-wave rectification circuit includes a second electrical controlled switch and a third electrical controlled switch in series connection. The three resistors of the election circuit are the main devices for dimming that the present invention has a lower cost and superior competition in the market.

Abstract: A string of lights has an electrical plug at one end and a receptacle at the other end and plural light-emitting diodes (LEDs) in series with a negative temperature coefficient (NTC) thermistor. The device also includes a bridge rectifier providing direct current to the LEDs and the thermistor but split between the plug and receptacle of the light string so that alternating current from the plug is delivered to the receptacle but direct current flow through the LEDs. Light string fuses protect the string but the NTC fuses protect the LEDs at a lower current rating. The LEDs can be arranged in a simple electrical series, or, in an alternative embodiment, an electrical series of groups of plural LEDs each of which is arranged electrically in parallel with other LEDs of the same group.

Abstract: A power supply system for an ion implantation system. In one particular exemplary embodiment, the system may be realized as a power supply system that includes a low frequency power inverter, a stack driver and a high voltage power generation unit that receives source power from the power inverter. The high voltage generation unit may include a high voltage transformer for providing an output power that is multiplied to a desired output level and delivered to an input terminal of an ion beam accelerator. The power supply system may also include a dielectric enclosure that encases at least a portion of the high voltage power generation unit, thereby preventing variation in the break down strength of the internal components.

Abstract: The present invention is disclosed by that the series connected capacitive impedance and inductive impedance are powered by a pulsed power, thereby to produce the bi-directional divided power in series resonance at each impedance, and be rectified by a rectifier device to provide DC power output to drive the unidirectional conducting light emitting diode.

Abstract: A single-stage electronic ballast device outputs a square wave current to drive an HID lamp, which includes a rectifying and power factor correction unit, a bridge converter and a controller circuit. The rectifying and power factor correction unit has an input connected to an AC power source to rectify an AC power to a DC power. The bridge converter comprises two bridge arms formed by four switches, load terminals defined by midpoints of the two bridge arms and the HID lamp is connected between the load terminals. The bridge converter converts DC current to square wave current to drive the HID lamp with power control. The load terminals are selectively connected to output of the rectifying and power factor correction unit to adjust waveform of input current for higher power factor. The controller circuit has output connected to DC link voltage terminal and load terminal of the bridge converter.

Abstract: Disclosed is a low cost LED string circuit design that uses an inexpensive half-wave rectification and low-pass filter circuit that is designed to produce minimal flicker in the LED string that is connected to the circuit. The components of the half-wave rectification and low-pass filter circuit are selected in accordance with design principles that prevent glittering and flickering of the LED string. The circuit components of the half-wave rectification and low-pass filter circuit can be embedded in an outlet plug or as a separate independent unit between an AC power plug and the LED string.

Abstract: An illumination system having cold cathode started, illumination controlled gas discharge lamps in series, includes the parts of a voltage-adjustable full-wave voltage-doubler rectifier power supply, a gas discharge lamp operating serially with the full-wave rectifier power supply, and inductor-resistor switches for controlling illumination.

Abstract: A LED lighting chain is disclosed to include a front plug, a rear plug, an AC-DC converter formed of four rectifying diodes, and a LED serial set, wherein the LED serial set has a voltage dropping device formed of a resistance and two capacitors so arranged that changing the resistance and capacitors relatively changes the voltage of the LED serial set, and therefore increasing the number of LEDs does not change the brightness of the LED serial set. Further, a resistance is connected in parallel to each capacitor of the voltage dropping device so that when power is off, residual electric energy is discharged out of the capacitors to ensure safety of the LED lighting chain and to prevent damage to the LEDs during start.

Abstract: An adapter for permitting a medical diagnostic instrument having an illumination source including at least one LED (light emitting diode) to be used with a power supply normally configured for use with a diagnostic instrument having at least one incandescent lamp as an illumination source. The adapter includes circuitry for compensating LED specific characteristics for permitting the power supply to be used with the LED.

Abstract: An improved decorative light string circuit comprises full bridge rectification located in or downstream of the front plug, wherein the rectification circuit contains one or more voltage reducing and/or filtering elements in order to reduce or limit LED drive current and reduce (filter) DC ripple and 1 or 2 LED series sets. Additional rectification circuits and LED series sets can be added in parallel to the first in “stacked mode”, with each rectification circuit and LED series set electrically independent of prior and subsequent circuits. This eliminates the rectifying diode current summation load restrictions imposed by prior art and associated safety hazard due to diode overheating.

Abstract: A DC-AC converter in a half bridge configuration is used for operation with high pressure discharge lamps as well as low pressure discharge lamps. The converter consists in two switches (T1-T2) serially connected through a first series of diodes (D1, D2) and a second series of diodes (D3,D4) to which at their middle points (N1, N2) a first and a second lamp loads (L1,L2,LA1,LA2) are connected. Furthermore, the second terminals of the lamp loads are connected to the middle point of a series of capacitors (C3,C4) which are also connected to the terminals (Ki,K2) of the supply voltage source. The converter includes also four diodes (D5,D6,D7,D8) which shunt the switches (T1,T2) and their respective series of diodes (D1,D2,D3,D4). The switches (T1,T2) are controlled by a controller (CC) which renders alternatively conductive at low frequency the two switches (Ti,T2).

Abstract: A current-regulating driver circuit for a light emitting diode (LED) maintains energization drive to and thereby illumination provided by the LED at a prescribed, substantially constant value, over a relatively wide range of input (AC or DC) voltage. First and second input nodes are coupled to a source of AC or DC voltage and to a load, powered by the source of AC or DC voltage. An input rectifying diode is coupled to the first input node. A controlled current flow element is coupled in a first current flow path between the input rectifying diode and the LED and is controllably operative to supply current for illuminating the LED.

Abstract: The present invention relates to a vacuum arc discharge power supply. The power supply may be a high frequency resonant AC supply or it may be rectified to give resonant DC. The power supply of the present invention may be used in x-ray production, vacuum arc deposition equipment, vacuum metal refining, ion implantation devices, or other applications that perform vacuum arc discharge.

Abstract: A full-wave driving circuit for multiple electroluminescent lamps includes circuitry at a collective first end of the electroluminescent lamps for boosting of both positive and negative waves, and control elements at second ends of the electroluminescent lamps for turning on/off individual lamps at different times, whereby single or multiple electroluminescent lamps can be driven to flash at the same time.

Abstract: A driver for an EL lamp includes a voltage boost circuit and an H-bridge output having an AC diagonal and a DC diagonal. An EL lamp is coupled across the AC diagonal. A current path is coupled in series with the DC diagonal and limits current through the EL lamp. The current path is either internal or external to the semiconductor device implementing the driver.

Abstract: The multiple lamp circuit for minimizing lamp current imbalance comprises at least one transformer comprising primary windings and secondary windings. Multiple lamps are coupled in serial to the secondary windings of the transformer. Multiple separated lamp drive circuits are spliced from the transformer's secondary windings. A current balancing resistance is connected at a common node of the multiple lamps and other terminal of the current balancing resistance is connected to ground. The impedance of the current balancing resistance is relatively high compared to the ones of the multiple lamps to generate a balancing current for one of the multiple lamps, thereby resulting a current that flows through the multiple lamps is approximately equal.

Abstract: An inverter for driving an EL lamp is tapped to provide voltage or current for driving one or more EL lamps, LEDs, and an LCD. In accordance with one aspect of the invention, one side of the pump inductor is tapped for a voltage that drives one or more LEDs and the LCD. In accordance with another aspect of the invention, the LEDs are in series with a storage capacitor and are driven by the current pulses to the storage capacitor.