Abstract: A light emitting diode (LED) backlight driving circuit includes a power supply, an LED light bar, and a constant current driving chip that adjusts brightness of the LED light bar. The constant current driving chip receives the PWM dimming signal. N boost units are connected in series between the power supply and the LED light bar, and the N boost units are connected in parallel with each other. Comparing units are correspondingly coupled to control ends of one or more of (N?1) boost units. When a duty ratio of the PWM dimming signal is less than a preset threshold, the comparing unit drives a corresponding boost unit to turn off. N is an integer greater than or equal to 2.

Abstract: A light emitting diode (LED) backlight driving circuit includes a power module, a constant current driving module, and an LED light bar coupled to the power module. The power module is coupled to a power-voltage collecting module outputting a second comparison voltage, and the LED light bar is coupled to a light-bar-voltage collecting module outputting a first comparison voltage. The constant current driving module includes a switching unit and a control unit coupled to the switching unit and adjusting an output voltage of the power module, the first comparison voltage and the second comparison voltage are sent to the switching unit, and a preset reference voltage is sent to the switching unit. When the first comparison voltage deviates from the reference voltage, and an absolute value of the reference voltage VF subtracted from the first comparison voltage exceeds a preset deviation range of a voltage, the switching unit outputs the first comparison voltage to the control unit.

Abstract: A driver circuit for driving light emitting diodes (LEDs). The driver circuit includes a string of LEDs divided into n groups and the n groups of LEDs is electrically connected to each other in series, where a downstream end of group m?1 is electrically connected to the upstream end of group m. The driver circuit also includes a power source coupled to an upstream end of group 1 and provides an input voltage. The driver circuit further includes current regulating circuits, where each of the current regulating circuits is coupled to the downstream end of the corresponding group at one end and coupled to a ground at the other end. Each of the current regulating circuits includes a sensor amplifier and a cascode having first and second transistors. The driver circuit also includes detectors, where each of the detectors detects a source voltage of the first transistor.

Abstract: A constant current source circuit includes a main circuit, wherein the main circuit includes a first three-terminal regulator, a transistor, a sample resistor and a load, an output terminal of the first three-terminal regulator is connected with a control Electrode of the transistor, a reference Electrode of the transistor is connected with a voltage input terminal, a working Electrode is connected with one end of the load, and the other end of the load is connected with one end of the sample resistor, and the other end of the sample resistor and an input terminal of the first three-terminal regulator are connected to a reference potential, respectively, wherein the constant current source circuit further includes an adjusting unit that includes a voltage stabilizing unit, a fourth resistor and a fifth resistor.

Abstract: A method of controlling an LED string having a first end coupled to a power source and a second end coupled to a first end of a current sink is provided. The method include generating a target voltage at a first end of an external inductor coupled to the second end of the current sink, comparing the target voltage to a measured voltage at the first end of the external inductor, charging the external inductor responsive to the measured voltage being greater than the target voltage, and discharging the external inductor responsive to the measured voltage being less than the target voltage.

Abstract: Disclosed is a variable power dimming control circuit for driving and linearly adjusting the illumination brightness of a plurality of light emitting diodes (LEDs), and the circuit includes a dimming stabilization unit and a control unit. The control unit is provided for detecting an input current of a circuit, and the dimming stabilization unit is driven for outputting a holding current when the input power is smaller than a standard, and stopping the output the holding current when the input power is greater than the standard. When the LEDs are dimmed to low luminance, a chip controls the operation of the dimming stabilization unit to assure the stability of the dimming operation of a TRIAC. When the LEDs are adjusted to high or full brightness, the chip stops the output of the holding current to reduce unnecessary power consumption and enhance the overall circuit performance effectively.

Abstract: A system and method for dimming an LED lighting installation using an AC power source are disclosed. The disclosed LED lighting system includes an LED light having one or more LEDs, a dimming control module for controlling and adjusting brightness level of the LED light toward a desired target brightness, and a user-operated lighting control device including a power on/off switch and a dimmer. The power on/off switch passes or interrupts the AC power fed into the dimming control module. A series of turned-off operations of the power on/off switch of transitory duration causes LED light target brightness levels to be progressively increasing or decreasing leading to a desired target brightness. Operations of the dimmer result in a target brightness setting signal being generated for the dimming control module, representative of a desired target brightness as well.

Abstract: An apparatus for driving LEDs using high voltage includes a plurality of LEDs divided into a plurality of LED segments connected in series and a plurality of three-terminal voltage controlled current limiting devices. Each of the current limiting devices is associated with one of the LED segments and has a first terminal connected to a negative end of the associated LED segment, a second terminal applied with a bias voltage and a third terminal connected to a common node. A current source is connected between the common node and ground. A power-loss reduction circuit having a plurality of LEDs controlled by an LED controlling circuit may further be inserted between the common node and the current source to reduce the power loss in the current source because of the high voltage at the common node.

Abstract: A circuit that has one or more control units that divide a load into two or more load groups, with each load group comprised of at least one load element. The one or more control units directing power from a power source to one or more of the load groups based on voltage variations in an output of the power source, load grouping, and operational parameters of the load elements. The circuit further includes one or more pass stages that regulate current flow from the power source to the load groups.

Abstract: The invention relates to a technical field of light emitting diodes (LEDs), in particular to a self-adaptive drive circuit and an LED lamp with the same. The LED lamp comprises a plurality of series LED lamp strings, and each LED lamp string comprises at least one series LED lamp bead; and the self-adaptive drive circuit comprises a rectifying unit, a current limiting unit, a voltage detection and connectivity control unit and at least one controllable switch unit. According to the self-adaptive drive circuit and the LED lamp with the same, the LEDs can be driven normally in an extremely simple drive mode, which can work without using complex constant current drive circuit and electrolytic capacitor that is life limiting. At the same time, the stroboflash phenomenon is eliminated, the power factor is improved, harmonic distortion is reduced, electromagnetic interference is eliminated, and the cost is reduced.

Abstract: A method and apparatus for controlling a light string is provided. A controller is coupled to the light string and is used to bias one or more of the multicolor LEDs within each bulb on the light string. Using a prearranged determination of 1) the multicolor LEDs within each bulb, 2) the placement of the bulbs within the light string, and 3) the proper biasing of the plurality of leads within the light string, the controller can be used to change the entire light string from one complex holiday color scheme to another using a simple switching mechanism to select from one a of a plurality of desired color schemes.

Abstract: There is an increasing need for simple and low cost power supplies to control loads such as battery chargers and LEDs. It is the object of this invention to provide an alternative method for the control of current in such loads with very high efficiency and to reduce the variation of load current with supply voltage. This invention is particularly relevant to LED power supplies or battery chargers and provides an electronic power supply for the control of an electrical load connected to an electrical source, the electrical load comprising a main load with at least one LED and an auxiliary load with at least one LED, the electronic power supply comprising a series compensation block connected in series with the main load and the voltage source, the series compensation block providing a voltage in opposition to the voltage source by directly controlling the power delivered to the auxiliary load and indirectly controlling the power converted in the main load.

Abstract: Described herein is a circuit and method for independent control of series connected light emitting diodes (LEDs). The circuit includes a first light emitting diode (LED) connected in series with a second LED. A current source is connected in series with the first LED and the second LED and a shunt circuit is connected in parallel with the first LED and the second LED. The shunt circuit includes a pair of serially connected resistors. The shunt circuit prevents inadvertent excitement of the LEDs due to leakage currents but minimally affect illumination characteristics of the LEDs. A pair of transistors is connected to the first LED and the second LED, respectively, and is biased using a set of bias resistors. A tri-state control signal switches on and off the pair of transistors and enables excitation of the first LED, the second LED or both via the current source.

Abstract: A dimming system of a lamp using a light-emitting device includes: a power source including a power input terminal, a dimmer connected to the power input terminal, and a rectifier circuit; a lighting unit including light-emitting devices from a first light-emitting device to an nth light-emitting device; a light-emitting drive unit including a plurality of switching circuits individually connected to an output terminal of each of the light-emitting devices, and dimmer control circuits connected to the switching circuits of the first light-emitting device and configured to sense whether or not a current supply channel for the first light-emitting device is normally operated, and to output a control signal; and a dimmer drive unit parallel-connected to a connection line between the power source and a power input terminal of the first light-emitting device to form a bleeding current supply channel, and having a switch.

Abstract: Ladder network circuits (100) for controlling operation of light emitting diodes (LEDS, 110) using current regulation. The circuits include a number of light sections (110) connected in series and a current regulation circuit (130) configured to limit a LED current flowing through the plurality of light sections (110).

Abstract: An apparatus for driving LEDs using high voltage includes a plurality of LEDs divided into a plurality of LED segments connected in series and a plurality of three-terminal voltage controlled current limiting devices. Each of the current limiting devices is associated with one of the LED segments and has a first terminal connected to a negative end of the associated LED segment, a second terminal applied with a bias voltage and a third terminal connected to a common node. A current source is connected between the common node and ground. A power-loss reduction circuit having a plurality of LEDs controlled by an LED controlling circuit may further be inserted between the common node and the current source to reduce the power loss in the current source because of the high voltage at the common node.

Abstract: An LED driver includes a power converter to convert an input voltage to a regulated voltage, a current source to be connected with an LED string in series between the power converter and a bias node, and a switching circuit to apply a bias voltage to the bias node to set the total voltage drop of the LED string and the current source. By controlling the total voltage drop of the LED string and the current source, the LED driver will automatically select a boost mode or a buck mode for operation, thereby improving the efficiency thereof.

Abstract: LED driver arrangements are disclosed comprising: an input; a plurality of switched mode boost converters, each connected to the input; and a plurality of outputs, each output having a different voltage and being for driving at least one LED string; wherein each of the plurality of switched mode boost converters is configurable to output of any one of the plurality of outputs. Controllers for such arrangements are also disclosed.

Abstract: An electrical circuit is disclosed and methods for controlling the same. The electrical circuit may comprises a plurality of color strings coupled in series, where each color string has at least one lamp, preferably a light emitting diode. Improved efficiency may be accomplished in some embodiments using certain of the disclosed systems and methods.

Abstract: A driving controller for driving a load is disclosed. The driving circuit includes a driving power supply and the driving controller. The driving power supply provides a first power source to the load. The controller is coupled to a second power source to receive an electric power for operating. The controller controls the amount of the electric power to the load when operating in a first mode and stops the driving power supply from providing the electric power to the load when operating in a second mode. The controller operates exclusively in the first mode before the driving power supply provides the first power source to the load.

Abstract: A driver circuit for driving light emitting diodes (LEDs). The driver circuit includes: a string of LEDs divided into n groups, the n groups of LEDs being electrically connected to each other in series, a downstream end of group m-1 being electrically connected to the upstream end of group m, where m is a positive number equal to or less than n. The driver circuit also includes a plurality of current regulating circuits, each of the current regulating circuits being coupled to the downstream end of a corresponding group at one end and coupled to the ground at the other end and including a sensor amplifier and a cascode having first and second transistors, each sensor amplifier being coupled to a different voltage source for providing a different reference voltage thereto.

Abstract: A dimmable solid state lighting apparatus can include a plurality of light emitting diode (LED) segments including a first LED segment that can have a targeted spectral power distribution for light emitted from the apparatus that is different than spectral power distributions for other LED segments included in the plurality of LED segments. An LED segment selection circuit can be configured to selectively control current through the plurality of LED segments to shift the light emitted by the apparatus to the targeted spectral power distribution responsive to dimming input.

Abstract: A ballast configured to connect to a set of lamps to energize the set of lamps is provided. The ballast comprises an inverter circuit for generating an oscillating power signal, wherein the oscillating power signal has a frequency, and a resonant tank circuit electrically connected to the inverter circuit for receiving the oscillating power signal and therefrom providing a lamp current to the set of lamps. A resistance circuit is connected to the inverter circuit. The resistance circuit has a resistance that defines the frequency of the oscillating power signal generated by the inverter circuit. A current control circuit is connected to the resistance circuit for adjusting the resistance of the resistance circuit as a function of a number of lamps that are connected to the ballast.

Abstract: A lighting circuit for a light emitting diode (LED) bulb capable of operating at different light output levels depending on received AC power includes a first group of LEDs and second group of LEDs, each of which is configured to emit light as a group. The lighting circuit also includes an AC/DC converter electrically connected to the first and second groups of LEDs. A detector circuit detects received AC power. A selection circuit is operable to cause the AC/DC converter circuit to provide current into one configuration of LEDs from the group of configurations of LEDs consisting of: the first group of LEDs only, the second group of LEDs only, and the first and second group of LEDs. The configuration of LEDs to provide current to is selected based on received AC power.

Abstract: A plurality of LED-based lighting units is segmented into a plurality of LED-based lighting segments connected in series. Each lighting segment has a plurality of LED-based lighting units connected in series with at least a series-connection switch, and a bypass-connection switch is connected in parallel with the series of LED-based lighting units. The total number of LED-based lighting units can be determined by a maximum voltage level of an input voltage supply and the forward voltage of the LED-based lighting unit for achieving optimal efficiency. The number of lighting segments and the number of lighting units in each lighting segment are properly chosen based on the total number of the LED-based lighting units in such away that any number up to the total number of all the LED-based lighting units can be connected in series by respectively controlling the series-connection switch and the bypass-connection switch of each LED-based lighting segment.

Abstract: A driver circuit for driving light emitting diodes (LEDs). The driver circuit includes: a string of LEDs divided into n groups, the n groups of LEDs being electrically connected to each other in series, a downstream end of group m?1 being electrically connected to the upstream end of group m, where m is a positive number equal to or less than n. The driver circuit also includes a plurality of current regulating circuits, each of the current regulating circuits being coupled to the downstream end of a corresponding group at one end and coupled to the ground at the other end and including a sensor amplifier and a cascode having first and second transistors, each sensor amplifier being coupled to a different voltage source for providing a different reference voltage thereto.

Abstract: An LED lamp includes a rectifier, an integrated circuit and a string of series-connected LEDs. The lamp receives an incoming AC signal such that a rectified version of the signal is present across the LED string. The integrated circuit includes a plurality of power switches. Each power switch is coupled so that it can separately and selectably short out a corresponding one of several groups of LEDs in the string. As the voltage across the string increases the integrated circuit controls the power switches such that the number of LEDs through which current flows increases, whereas as the voltage across the string decreases the integrated circuit controls the power switches such that the number of LEDs through which current flows decreases. LED string current flow is controlled and regulated to provide superior efficiency, reliability, anti-flicker, regulation against line voltage variations, power factor correction, and lamp over-voltage, over-current, and over-temperature protection.

Abstract: A light source module includes a LED array, a switch and a control part. The LED array includes a plurality of LED rows and a bridge light emitting part connecting the LED rows with each other. Each of the LED rows has a first direction light emitting part and a second direction light emitting part which are alternately disposed with each other. The switch adjusts an intensity of a current applied to the LED array. The control part determines an output status of the LED array and provides a control signal to the switch.

Abstract: A light emitting diode luminance system includes a first power source, a voltage divider, a first switch, a clamping device, a plurality of current sources and a feedback circuit. The voltage divider is coupled to the first voltage source. The first switch is coupled to the voltage divider and a ground. The clamping device includes a plurality of transistors each coupled to a respective set of light emitting diodes and the voltage divider. The plurality of current sources is coupled to the plurality of transistors respectively. The feedback circuit is coupled to the plurality of transistors and the plurality sets of light emitting diodes.

Abstract: An analog electronic circuit for driving a string of LEDs including input terminals for accepting connection to AC voltage, a current regulation circuit operatively coupled to receive an AC voltage from the input terminals and to provide an output for connection to drive the string of LEDs. Included is a current regulation circuit configured to limit the current flow through the string of LEDs on a half-cycle basis to a predetermined value. Also disclosed is an over voltage circuit configured to switch off electrical connection between the AC voltage and the string of LEDs upon the AC reaching a predetermined high voltage value on a half-cycle basis.

Abstract: A light emitting diode (LED) driver circuit controls switching of an output transistor. The LED driver circuit monitors inductor current flowing through an output inductor that is coupled to one or more LEDs. In response to detecting that the inductor current has reached a peak value, the LED driver circuit switches OFF the output transistor. The LED driver circuit switches ON the output transistor in response to detecting zero crossing of the inductor current. The LED driver circuit may detect zero crossing of the inductor current from a gate voltage of the output transistor by detecting for a negative spike.

Abstract: In one embodiment, an LED current controller is formed to determine which of a plurality of LED branches has the largest voltage drop and to select the current through that branch to use in controlling the value of current that flows through other LED branches.

Abstract: A lighting device and a method of controlling a light emitted thereby are disclosed. A lighting device according to the present invention includes a rectifier unit configured to rectify an alternation current voltage to supply the rectified voltage to each of light emitting units, the light emitting units configured of a plurality of light emitting diodes connected with each other in series, a control unit configured to control each light emitting unit and a first switching element based on the input voltage and the first switching element configured to be switched on and off based on the control of the control unit, wherein the control unit controls to the first switching element switch on and off based on the input voltage to connect the first light emitting unit and the second light emitting unit alternatively in series and parallel.

Abstract: A LED light source comprises a first rectifier (DB1) having input terminals coupled to an AC voltage source and output terminals connected by a first series arrangement comprising N LED loads and further comprises circuitry (I1, I2, I3, CC) for making the LED loads one by one carry a current when the momentary value of the AC voltage increases and one by one stop carrying a current when the momentary value of the AC voltage decreases. The LED light source also comprises a second rectifier (DB2) having input terminals coupled to the AC voltage source via a reactive element and LED1 LED2 LED3 output terminals connected by a second series arrangement comprising M LED loads and further comprises circuitry (I4) for making the LED loads one by one carry a current when the momentary value of the AC voltage present at the input terminals of the second rectifier increases and one by one stop carrying a current when the momentary value of the AC voltage decreases.

Abstract: An array of LED diodes includes N channels each having LEDs coupled in series with a switch. A current driver for the array includes a processing circuit configured to detect N currents flowing respectively through the N channels of the array. The detected currents are converted by a single analog to digital converter, one at a time, into a digital word. The circuit further includes N comparator devices configured to control the N switches as result of a comparison between the digital words and respective target digital words. A memory is provided for storing the digital words received from the analog to digital converter.

Abstract: A power converter for an LED assembly includes a switched mode power supply arranged to power the LED assembly, an AC/DC converter arranged to provide a DC supply voltage to the switched mode power supply, and a control unit arranged to receive an input signal representing a required load voltage for powering the LED assembly. The control unit is arranged to control the AC/DC converter based on the input signal.

Abstract: One embodiment in accordance with the invention can include a circuit for controlling a light emitting diode (LED) lighting fixture via a power line. The circuit can include a power switch coupled to the power line and is for outputting a firing angle. Additionally, the circuit can include a control circuit coupled to the power switch and is for implementing firing angle control of the power switch. Furthermore, the circuit can include a translator coupled to receive the firing angle and for mapping the firing angle to a function of the LED lighting fixture.

Abstract: A light emitting module includes a body, first to Mth (wherein, M is an integer of 2 or greater) light emitting devices provided on the body to be spaced apart from each other, and a turn-on controller controlling the first to Mth light emitting devices to turn on. An mth (1?m?M) light emitting device among the first to Mth light emitting devices comprises first to Nth (wherein, N is an integer of 2 or greater) light emitting cells connected to each other in series. An nth (1?n?N) light emitting cell among the first to Nth light emitting cells includes at least one light emitting structure, and the turn-on controller simultaneously turns on or turns off the nth light emitting cells of the first to Mth light emitting devices.

Abstract: An LED arrangement includes a first LED chain having first LEDs; a second LED chain having second LEDs; a circuit arrangement for coupling the first and second LED chains to a supply source; wherein the circuit arrangement is configured such that the first and second LED chains can be coupled to or decoupled from the supply source, wherein the first LED chain can be coupled to the supply source at first points in time and the second LED chain can be coupled to the supply source at second points in time; wherein the circuit arrangement is configured such that, in the case of a coupling of the LED arrangement to the supply source, a current having a first average current intensity through the first LED chain and a current having a second average current intensity through the second LED chain, wherein the LEDs are arranged depending on their current intensities.

Abstract: The present invention provides an overvoltage protection method for backlight drive circuit of 2D/3D mode and a backlight drive circuit using the method. The method includes: providing a liquid crystal display, the liquid crystal display having a 2D mode and a 3D mode, the liquid crystal display including a backlight drive circuit; the backlight drive circuit using the first overvoltage protection voltage level as an overvoltage protection voltage level when the liquid crystal display is set in the 2D mode; and the backlight drive circuit using the second the overvoltage protection voltage level as an overvoltage protection voltage level when the liquid crystal display is set in the 3D mode, the second the overvoltage protection voltage level being greater than the first overvoltage protection voltage level. Different overvoltage protection voltage levels are provided for the 2D and 3D modes so as to alleviate impact on components by over voltage.

Abstract: Illumination devices (10), systems and methods that convert an alternating current (AC) supply (14) to a direct current (DC) for powering a plurality of light emitting diodes (LEDs) are disclosed. An illumination device (10) comprises a full wave rectifier (12) for converting the AC supply into a direct current (DC). A current limiting diode (CLD) module (16), comprising at least one CLD is coupled in series to an output of the full wave rectifier and a light emitting diode (LED) module (18) comprising a plurality of LEDs is coupled in series between an output of the CLD module (16) and the full wave rectifier (12).

Abstract: A backlight driving circuit is disclosed. The backlight driving circuit includes a steady voltage circuit, a boost converter, a current setting circuit, and a control circuit. The steady voltage circuit receives an input voltage, filters the input voltage and outputs a steady DC voltage. The boost converter connects to the steady voltage circuit to receive the steady DC voltage. The control circuit provides a first PWM square wave such that the boost converter may supply power to the LED light bar. Wherein the boost converter includes a first MOSFET or a triode. At least three parallel connected resistors are arranged between a source of the first MOSFET or a collector of the triode and the ground, and the three resistors have the same or similar resistance. In addition, a liquid crystal display includes the backlight driving circuit is also disclosed.

Abstract: A lamp including a first set of light emitting diodes configured to generate first light, a second set of light emitting diodes configured to generate second light, and a third set of light emitting diodes configured to generate third light. The first light, the second light, and the third light combine to produce white light. A first switch is located at a base portion of the lamp. The state of the first switch corresponds to a color temperature of the white light. A color temperature adjustment module is configured to vary outputs of the first, second, and third sets of light emitting diodes in accordance with the color temperature of the white light selected by a user using the first switch.

Abstract: An LED control circuit for controlling a current supplied to an LED unit is disclosed. A sense resistor is included for sensing an output current provided from an output node. A comparator circuit is provided for detecting upper and lower thresholds in the output current based on the voltages at ends of the sense resistor, and for controlling a current supply to maintain the current between the thresholds. The comparator circuit comprises a reference current source and reference resistors, for generating upper and lower threshold references. The comparator circuit further comprises a comparator for detecting a mid-range voltage dependent on the output current and deriving a control signal which indicates if the detected voltage is above or below the mid-range voltage. The control signal is used to adjust the reference current source, thereby to vary the upper and lower threshold references to maintain a constant median or average output current.

Abstract: A lighting system includes: a rectifier full-wave rectified an AC voltage to generate an output voltage; first and second LED groups connected to each other in series, wherein an input terminal of the first LED group is coupled to the output voltage; first terminals of first and second switches respectively coupled to output terminals of the first and second LED groups; a first resistor having a first terminal connected to the second terminal of the first switch and the second switch and a second terminal connected to a ground voltage; and first and second operational amplifiers having output terminals respectively coupled to control terminals of the first and second switches, and inverting input terminals respectively coupled to the first terminal of the first resistor, and non-inverting input terminals respectively coupled to the first and second reference voltages.

Abstract: An LED dimmer circuit to sequentially control multiple banks of LEDs connected in series. The invention is designed to respond to demands for more or less illumination by sequentially turning on or off one or more banks of LEDs. Each bank is turned off or on in response to the phase angle of an AC power source with each LED bank being controlled by a different phase angle.

Abstract: Methods and apparatus are provided to fabricate massive monolithic arrays of individually addressable light emitting diodes, assemble a plurality of such massive monolithic arrays of individually addressable light emitting diodes, control each individual light emitting diode, and to assemble the same in manner to achieve the accuracy and stability for a massive number of individually controlled light emitting diodes that can then be focused using projection optics on to a photoreceptive surface. In addition methods and apparatus are provided to move the imaging system thus described relative to the photoreceptive surface in two axes orthogonal to each other thus exposing the photoreceptive surface.

Abstract: A light emitting diode (LED) backlight driving circuit includes a light bar and a power supply module that is coupled with the light bar. The light bar and the power supply module are connected by a flexible circuit board. The light bar is also connected with a measuring resistor in series. A test point is arranged at two ends of the measuring resistor.

Abstract: The subject matter disclosed herein relates to a system for controlling strings of lights. This system can include a host controller, one or more strings of lights, and an effects modulator. Each string of light can include at least one LED light. The effects modulator can be operatively connected to the host controller and to the strings of light. The effects modulator can include a microcontroller and an inverter. The inverter can include a high side driver circuit and one or more low side driver circuits operatively connected to the high side driver circuit. Each low side driver circuit can be operatively connected to one of the strings of light. The microcontroller can be configured to receive one or more control signals from the host controller and control the strings of light via the inverter in accordance with the control signals. Related apparatus, methods, and techniques are also described.

Abstract: An LED driving circuit, adapted to drive an LED module, is disclosed. The LED driving circuit comprises a converting circuit, a converting controller, and a short-circuit protection circuit. The converting circuit, having a capacitor coupled to the LED module, is coupled to an input power source to proceed converting operation to supply an output current for driving the LED module. The converting controller controls the converting circuit to provide a stable current flowing through the LED module. The short-circuit protection circuit is coupled to the LED module in series and cuts the current flowing through the LED module off when detecting that the current higher than a current protection value.