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588 results about "TRIAC" patented technology
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TRIAC, from triode for alternating current, is a generic trademark for a three terminal electronic component that conducts current in either direction when triggered. Its formal name is bidirectional triode thyristor or bilateral triode thyristor. A thyristor is analogous to a relay in that a small voltage induced current can control a much larger voltage and current. The illustration on the right shows the circuit symbol for a TRIAC where A1 is Anode 1, A2 is Anode 2, and G is Gate. Anode 1 and Anode 2 are normally termed Main Terminal 1 (MT1) and Main Terminal 2 (MT2) respectively.
Impedance matching circuit for current regulation of solid state lighting
ActiveUS20070182347A1Low component requirementsElectrical apparatusElectroluminescent light sourcesSilicon-controlled rectifierElectrical resistance and conductance
Exemplary embodiments provide an impedance matching circuit for providing variable power from a dimmer switch having a triac to a switching power supply couplable to solid-state lighting. An exemplary impedance matching circuit includes a first resistor coupled to receive a first current from the switching power supply; a second resistor; and a transistor coupled in series to the second resistor, with the transistor responsive to a gate voltage to modulate a second current through the second resistor in response to a detected level of the first current through the first resistor.
Owner:CHEMTRON RES
Current regulator for modulating brightness levels of solid state lighting
ActiveUS20070182338A1Low component requirementsElectrical apparatusElectroluminescent light sourcesImpedance matchingRoot mean square
An exemplary embodiment provides a current regulator for controlling variable brightness levels for solid state lighting. The current regulator is couplable to a phase-modulating switch, such as a dimmer switch, which is coupled to an AC line voltage. An exemplary current regulator includes a rectifier; a switching power supply providing a first current; an impedance matching circuit; and a controller. The impedance matching circuit is adapted to provide a second current through the phase-modulating switch when a magnitude of the first current is below a first predetermined threshold, such as a holding current of a triac of the phase-modulating switch. The controller is adapted to determine a root-mean-square (RMS) voltage level provided by the phase-modulating switch from the AC line voltage and to determine a duty cycle for pulse-width current modulation by the switching power supply in response to the comparison of the RMS voltage level to a nominal voltage level.
Owner:CHEMTRON RES
Dimming Circuit for Led Lighting Device With Means for Holding Triac in Conduction
InactiveUS20080258647A1Sufficient currentElectrical apparatusStatic indicating devicesEffect lightEngineering
The invention disclosed herein is a dynamic dummy load to allow a phase control dimmer to be used with LED lighting. The invention includes providing a dynamic dummy load to provide a load to the dimmer when the LED electronics do not provide sufficient load due to start up issues or ringing in the circuit, the dynamic dummy load providing a reduced flow of current when the LED and its converter electronics provide sufficient current draw from the dimmer. The system generally includes a power source electrically connected to a phase control dimmer, the phase control dimmer electrically connected to converter circuitry to convert the AC power output of the dimmer to DC power output for powering the LED lighting, a dynamic dummy load electrically connected in parallel with the converter circuitry, the dummy load varying its current draw in response to operation of the converter circuitry.
Owner:DYNAMIC LED TECH LLC
Two-wire dimmer switch for low-power loads
ActiveUS20110121752A1No minimum load requirementAc-dc conversion without reversalElectroluminescent light sourcesTRIACDimmer
A two-wire load control device (such as, a dimmer switch) is operable to control the amount of power delivered from an AC power source to an electrical load (such as, a high-efficiency lighting load) and has substantially no minimum load requirement. The dimmer switch includes a bidirectional semiconductor switch, which is operable to be rendered conductive each half-cycle and to remain conductive independent of the magnitude of a load current conducted through semiconductor switch. The dimmer switch comprises a control circuit that conducts a control current through the load in order to generate a gate drive signal for rendering the bidirectional semiconductor switch conductive and non-conductive each half-cycle. The control circuit may provide a constant gate drive to the bidirectional semiconductor switch after the bidirectional semiconductor switch is rendered conductive each half-cycle. The bidirectional semiconductor switch may comprise, for example, a triac or two field-effect transistors coupled in anti-series connection.
Owner:LUTRON TECH CO LLC
Impedance matching circuit for current regulation of solid state lighting
ActiveUS7656103B2Low component requirementsElectrical apparatusElectroluminescent light sourcesElectrical resistance and conductanceTRIAC
Owner:CHEMTRON RES
Power stealing for a thermostat using a TRIAC with FET control
InactiveUS7755220B2Improved power stealingBatteries circuit arrangementsTemperatue controlElectricityControl power
An electronic thermostat circuit has improved power stealing for controlling an AC control device. The circuit comprises a source of AC control power coupled to an electronic switch means having an electronic switch means control input. The electronic switch means controls the AC control device. The diode bridge controls the electronic switch means by a DC control signal applied to the diode bridge means DC connection. The amplifier means has an amplifier input for controlling the state of the amplifier and an amplifier output for generating the DC control signal. An isolated gate FET means is electrically coupled to the amplifier input for controlling the state of the amplifier. The isolated gate FET means is powered by the current derived from the source of AC control power by power stealing. The digital signal controls the state of the AC control.
Owner:CARRIER CORP
Current regulator for modulating brightness levels of solid state lighting
ActiveUS7902769B2Low component requirementsElectrical apparatusElectroluminescent light sourcesImpedance matchingRoot mean square
An exemplary embodiment provides a current regulator for controlling variable brightness levels for solid state lighting. The current regulator is couplable to a phase-modulating switch, such as a dimmer switch, which is coupled to an AC line voltage. An exemplary current regulator includes a rectifier; a switching power supply providing a first current; an impedance matching circuit; and a controller. The impedance matching circuit is adapted to provide a second current through the phase-modulating switch when a magnitude of the first current is below a first predetermined threshold, such as a holding current of a triac of the phase-modulating switch. The controller is adapted to determine a root-mean-square (RMS) voltage level provided by the phase-modulating switch from the AC line voltage and to determine a duty cycle for pulse-width current modulation by the switching power supply in response to the comparison of the RMS voltage level to a nominal voltage level.
Owner:CHEMTRON RES
Thermostat operable from various power sources
InactiveUS6886754B2Fluid heatersTemperature control using electric meansVoltage spikeOperating point
A thermostat is operable from battery, common-wire (“C-wire”), or furnace relay power. The thermostat includes a power source selector, such as a jumper wire, that is set when the thermostat is installed in a heating system. In a gas millivolt heating system, the thermostat operates off of battery power. In heating systems having a C-wire, a diode bridge converter converts alternating-current voltage to direct-current voltage to provide operating power to the thermostat. In heating systems without a C-wire and having sufficient furnace relay current, a triac converter in series with the furnace relay provides voltage spikes to the diode bridge converter to provide operating power to the thermostat when the furnace is on, and the diode bridge converts AC to DC voltage when the furnace is not on. The thermostat can also be used in cooling systems and heating, ventilation, and air-conditioning systems. Thus, the thermostat can be used in a wide variety of applications.
Owner:TIM SIMON
Switching power converter control with triac-based leading edge dimmer compatibility
In at least one embodiment, a controller allows triac-based dimmer to properly function and dim a load whose voltage is regulated by a switching power converter. In at least one embodiment, the switching power converter includes a switch to control voltage conversion of an input voltage to the switching power converter, wherein phase delays are introduced in the input voltage by a triac-based dimmer during a dimming period. In at least one embodiment, the controller is configured to control the switch of the switching power converter to establish an input resistance of the switching power converter during a dimming portion of the input voltage, wherein the input resistance allows the triac-based dimmer to phase modulate a supply voltage to the dimmer so that an output voltage of the dimmer has a substantially uninterrupted phase delay during each half-cycle of the supply voltage during the dimming period.
Owner:SIGNIFY HLDG BV
Occupant Counter Control Switch for automatic turning on and off electrical appliances in a room
InactiveUS7155317B1Save energyEasy to changeProgramme controlBoards/switchyards circuit arrangementsAlone leftAudio power amplifier
A provided smart switch called Occupant Counter Control Switch, or OCCS, basically comprises of a motion sensor PIR, a photo sensor, an amplifier with band-pass filter, a microprocessor, a digital display, and a relay or triac to drive electrical appliances such as lights. The PIR sensor detects heat from a human body moving across it and generates a distinctive signal that is, unique to each of the two directions, further processed by the microprocessor for counting and thereby controlling the relay. Installed at the entrance of a room replacing the regular switch (see FIG. 1), the OCCS counts up, displaying a digit great than zero, upon detecting a person entering the room and turns on the lights if sensing insufficient ambient light. OCCS constantly energizes the lights during the room is occupied and immediately switches them off upon counting down to zero when detecting the last person exiting the room.
Owner:TRAN NHAN
Load control device for use with lighting circuits having three-way switches
A smart dimmer for control of a lighting load from an AC power source can replace any switch in a three-way or four-way lighting control system. The smart dimmer can be connected on the line-side or the load-side of a three-way system with a standard three-way switch in the other location. According to one embodiment of the present invention, the dimmer includes two triacs to control the intensity of the connected lighting load. The dimmer preferably includes two gate drive circuits coupled to the gates of the triacs for rendering the triacs conductive each half-cycle of the AC power source. The gate drive circuits include sensing circuits for detect whether the gates currents are flowing after the triacs are rendered conductive. A controller is operable to determine the state of the lighting load in response to whether the gate current is flowing or not flowing.
Owner:LUTRON TECH CO LLC
Dimmable lighting system
A lighting system for operation with a dimmer circuit comprising a triac connected to a load. The load comprises a driver circuit for supplying current to a light source comprising one or more LEDs, the current being determined at least in part by an adjusted setpoint value. The system further comprises a setpoint filter circuit for obtaining a dimmer setpoint value determined at least in part by a setting of the dimmer circuit, and for generating an adjusted setpoint value. The sensitivity of the adjusted setpoint value to changes in the dimmer setpoint value is low at low values of the dimmer setpoint value.
Owner:SIGNIFY HLDG BV +1
Multi-Mode Dimmer Interfacing Including Attach State Control
A system and method includes a controller that is configured to coordinate (i) a low impedance path for a dimmer current, (ii) attaching a dimmer to a power converter system at the leading edge of a phase-cut, rectified input voltage, (iii), control of switch mode power conversion, and (iv) an inactive state to, for example, reduce the dimmer current while allowing a dimmer to function normally from cycle to cycle of an alternating current (AC) supply voltage. In at least one embodiment, the dimmer functions normally when the dimmer conducts at a correct phase angle indicated by a dimmer input setting and avoids prematurely resetting while conducting. In at least one embodiment, by coordinating functions (i), (ii), (iii), and (iv) the controller controls a power converter system that is compatible with a triac-based dimmer.
Owner:SIGNIFY HLDG BV
Powering high-efficiency lighting devices from a triac-based dimmer
ActiveUS20120025729A1Preventing false triggeringDissipative loadingElectrical apparatusElectroluminescent light sourcesTRIACThyratron
A circuit for powering high-efficiency lighting devices from a thyristor-controlled dimmer predicts a zero-crossing time of the AC power line supplying the dimmer and causes a glue impedance to be imposed at the output of the dimmer starting at the time of the zero-crossing, so that the timer in the dimmer will operate properly to generate the turn-on event at the correct time. At turn-on, a lower level of impedance is presented to absorb the energy associated with the turn-on event. A higher level of impedance may be presented after the energy is absorbed until all of the energy needed for the cycle is transferred. Then, a high impedance state is maintained until the next zero-crossing time. The impedance control may be provided by non-uniform operation of a power converter that supplies the lighting devices, or by a combination of non-uniform power converter operation and dissipative loading.
Owner:SIGNIFY HLDG BV
Dimmer Output Emulation
InactiveUS20120043913A1Electrical apparatusElectroluminescent light sourcesConvertersSilicon-controlled rectifier
A lighting system includes a dimmer output voltage emulator to cause a power converter interface circuit to generate an emulated dimmer output voltage. In at least one embodiment, the emulated dimmer output voltage corresponds to an actual dimmer output voltage but is unaffected by non-idealities in the dimmer output voltage, such as premature shut-down of a triac-based dimmer. By generating an emulated dimmer output voltage, the energy delivered to a load, such as a lamp, corresponds to a dimming level setting.
Owner:SIGNIFY HLDG BV
Dimmer switch with adjustable high-end trim
InactiveUS20070285027A1Reducing high-end trimReducing having substantially no affectElectric ignition installationSwitch power arrangementsMinimum timeTRIAC
A dimmer switch has a user adjustable high-end trim. The dimmer switch includes a bidirectional semiconductor switch, such as a triac, for controlling the amount of power delivered from a source of alternating current power to a lighting load, such as an electric lamp. A user-adjustable timing circuit controls the conduction time of the triac from a minimum time to a maximum time. The maximum possible conduction time of the triac is the high-end trim. The minimum possible conduction time of the triac is the low-end trim. The timing circuit includes a user-accessible switch that allows a user to reduce the high-end trim from a first nominal level to a second reduced level, lower than the first level, without substantially affecting the low-end trim. The switch allows a user to switch a transient voltage suppressor into and out of parallel connection with a resistor that is part of an RC timing circuit for the triac. The dimmer switch advantageously uses less energy and the lifetime of the lamp is extended when the second reduced level of the high-end trim is selected.
Owner:LUTRON TECH CO LLC
Constant voltage dimmable LED driver
InactiveUS8497637B2Minimum currentCreate quicklyElectrical apparatusElectroluminescent light sourcesTRIACDimmer
A constant voltage dimmable LED (Light Emitting Diode) driver is disclosed that is compatible with all types of dimmers, including conventional phase cut (TRIAC) dimmers, and behaves like a conventional constant voltage driver which can be connected to any size of LED load that has a matching voltage rating. The driver produces a continuous train of pulses for driving the LED load and obtains an averaged measure of the voltage at the AC input for controlling the duty cycle of the continuous train of pulses. Therefore, when the averaged measure of the voltage at the AC input is reduced by a dimmer, the duty cycle reduces, resulting in a dimmed LED. The driver can be created by adding a few components to a conventional wide input range AC-DC converter without or with very little modifications.
Owner:LIU GANG GARY
Dimming circuit for LED lighting device with means for holding TRIAC in conduction
InactiveUS7872427B2Sufficient currentStatic indicating devicesElectroluminescent light sourcesElectronElectric power
Owner:DYNAMIC LED TECH LLC
Load control device for use with lighting circuits having three-way switches
Owner:LUTRON TECH CO LLC
Coordinated dimmer compatibility functions
A system and method includes a controller that is configured to coordinate (i) a low impedance path for a dimmer current, (ii), control of switch mode power conversion and (iii) an inactive state to, for example, to allow a dimmer to function normally from cycle to cycle of an alternating current (AC) supply voltage. In at least one embodiment, the dimmer functions normally when the dimmer conducts at a correct phase angle indicated by a dimmer input setting and avoids prematurely resetting while conducting. In at least one embodiment, by coordinating functions (i), (ii), and (iii), the controller controls a power converter system that is compatible with a triac-based dimmer. In at least one embodiment, the controller coordinates functions (i), (ii), and (iii) in response to a particular dimming level indicated by a phase cut, rectified input voltage supplied to the power converter system.
Owner:SIGNIFY HLDG BV
Enhanced active preload for high performance LED driver with extended dimming
Enhanced active preload circuits for an LED driver implementing phase-angle dimming are disclosed. The enhanced active preload circuits may be used with any type of phase-angle control dimmer that either controls the leading edge or trailing edge of the line voltage cycle. In one example, the enhanced active preload circuitry may be used with an isolated or non-isolated LED driver converter having a Triac leading edge phase-angle control dimmer by directly sensing (e.g., by sensing the dimming level using an output / load voltage signal or output / load current signal) or indirectly sensing (e.g., by sensing a signal of output or bias winding) the Triac conduction angle. The enhanced active preload circuitry may advantageously improve performance of the LED driver by extending the dimming ratio at deep dimming and by adjusting the preload sinking current in response to a preload control signal.
Owner:POWER INTEGRATIONS INC
Duty factor probing of a triac-based dimmer
InactiveUS20120112651A1Improve efficiencyElectrical apparatusElectroluminescent light sourcesTRIACThyratron
A power supply circuit for operating high-efficiency lighting devices from a thyristor-controlled dimmer determines the dimming value, i.e., the dimmer duty factor by periodically probing the dimmer output. A minimum conductance is applied across the output of the dimmer during probing intervals that begin at the turn-on time of the dimmer and last until enough information has been gathered to correctly predict a next zero crossing of the AC line voltage that supplies the input of the dimmer. The dimming value is determined from the time interval between the predicted zero-crossing and a next turn-on time of the dimmer. The probing can be performed at intervals of an odd number of half-cycles of the AC line frequency so that a DC offset is not introduced within internal timing circuits of the dimmer. The AC line frequency can also be determined from a time interval between the predicted zero crossings.
Owner:SIGNIFY HLDG BV
LED lighting
ActiveUS9420644B1Energy efficiency sufficientGuaranteed uptimeElectrical apparatusElectric circuit arrangementsTRIACDimmer
Apparatus and associated methods relate to a diversion driver module that dynamically adds a diversion current to an LED current so that the summed current maintains a predetermined minimum holding current requirement of a phase-controlled dimmer supply. In an illustrative example, the diversion current may be a function of input AC line voltage and / or firing angle of the phase-controlled dimmer supply. The phase controlled device may include, for example, a triac. The triac may supply adjustable pulse-width current to dim the LED according to a phase control signal. The diversion driver module may include one or more heat dissipating components disposed in thermal communication with the lamp base. Some driver modules may be sufficiently compact and energy efficient to provide smooth dim-to-black performance while operating within acceptable temperature limits for reliable operation while contained in the base of a standard form factor lamp, such as an E12 full-glass lamp.
Owner:FILAMENT LIGHTING LLC
Central vacuum cleaning system control subsystems
InactiveUS7403360B2Coupling device detailsEmergency protective arrangements for automatic disconnectionControl powerTRIAC
Owner:CUBE INVESTMENTS
A led dimming circuit suitable for thyristor dimmer
InactiveCN102300375AGood dimming effectImprove consistencyElectric light circuit arrangementMicrocontrollerTRIAC
An LED dimming circuit suitable for thyristor dimmers, 50 / 60Hz AC sine wave waveforms are chopped by a triac (TRIAC), rectified by a bridge rectifier circuit (A), and separated by an isolation circuit ( U1) Take out the chopping waveform and send it to the single-chip control unit (MCU), the single-chip control unit (MCU) outputs the PWM waveform to the LED driver chip (LEDDRIVE), and the LED driver chip (LEDDRIVE) drives the light-emitting diodes (LED1, LED2) to emit light. It makes the LED lamp directly replace the incandescent lamp with the same perfect dimming effect, and the circuit is simple and the cost is low, which overcomes an important obstacle for the LED lamp to replace the incandescent lamp.
Owner:缪仙荣
Power supply for LED lamp with triac dimmer
ActiveUS20170027029A1Reducing bleeder current consumptionImprove power factorElectrical apparatusElectroluminescent light sourcesSilicon-controlled rectifierTRIAC
A bleeder circuit is provided in a switched mode power supply (SMPS) that provides a compensation current when the loop current drops below the holding current of the TRIAC to alleviate light flickering problem. Further, automatic power factor correction is also provided in embodiments of the invention, which enables the output current to be in phase with the input voltage. The power factor correction not only improves the efficiency of the power supply, it can also reduce the compensation current and the duration in which compensation current flows, thereby reducing the power loss in the bleeder circuit.
Owner:BCD SHANGHAI MICRO ELECTRONICS CO LTD +1
Dimmer output emulation
InactiveUS8569972B2Electrical apparatusElectroluminescent light sourcesConvertersSilicon-controlled rectifier
A lighting system includes a dimmer output voltage emulator to cause a power converter interface circuit to generate an emulated dimmer output voltage. In at least one embodiment, the emulated dimmer output voltage corresponds to an actual dimmer output voltage but is unaffected by non-idealities in the dimmer output voltage, such as premature shut-down of a triac-based dimmer. By generating an emulated dimmer output voltage, the energy delivered to a load, such as a lamp, corresponds to a dimming level setting.
Owner:SIGNIFY HLDG BV
Systems and methods for intelligent control related to triac dimmers
ActiveUS20150312988A1Wide rangeImprove energy efficiencyElectrical apparatusElectroluminescent light sourcesDriving currentTRIAC
System controller and method for a lighting system. The system controller includes a first controller terminal configured to receive a first signal, and a second controller terminal configured to output a second signal to a diver component. The driver component is configured to receive a first current and provide one or more drive currents to one or more light emitting diodes in response to the second signal. Additionally, the system controller is configured to process information associated with the first signal, determine a first time period for the first signal to increase from a first threshold to a second threshold, and determine a second time period for the first signal to decrease from the second threshold to the first threshold.
Owner:GUANGZHOU ON BRIGHT ELECTRONICS
Triac/scr-based energy savings device, system and method
ActiveUS20090051344A1Save energyDc network circuit arrangementsIgnition automatic controlEngineeringPoint detector
A TRIAC / SCR-based energy savings device, system and method (1) wherein a predetermined amount of voltage below a nominal line voltage and / or below a nominal appliance voltage is saved, thereby conserving energy. Phase input connections (2) are provided for inputting analog signals into the device and system (1). A magnetic flux concentrator (3) senses the incoming analog signal (20) and a volts zero crossing point detector (5) determines the zero volts crossing point (21) of the signal (20). The positive half cycle (22) and negative half cycle (23) of the signal (20) are identified and routed to a digital signal processor (10) for processing the signal (20). The signal (20) is reduced by pulse width modulation and the reduced amount of energy is outputted, thereby yielding an energy savings for an end user.
Owner:THE POWERWISE GRP
Bleeder circuit and control method thereof, and LED control circuit
ActiveUS20180139816A1Reduce power consumptionImprove system efficiencyElectrical apparatusElectroluminescent light sourcesTRIACComputer module
The present disclosure discloses a bleeder circuit and a control method thereof, and an LED control circuit. The present disclosure is applied in an LED control circuit of TRIAC dimming, directly or indirectly detects cross-zero point of input voltage; after cross-zero point of the input voltage is delayed by a second time, the bleeder module works to generate bleeder current, and a time between turn-on time of the TRIAC and a time that a driving circuit input current achieves a predetermined value (maintaining current of TRIAC) is a first time. During the first time, the bleeder circuit generates losses; when the first time is greater than a predetermined value, the second time is prolonged; when the first time is smaller than the predetermined value, the second time is reduced, such that the first time is close to or equal to the predetermined value. By using the present disclosure, the second time, which is used as the delay time, is self-adaptively adjusted according to the first time and the predetermined value, and the bleeder power consumption is reduced and system efficiency is enhanced.
Owner:JOULWATT TECH INC LTD
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