Brightness control circuit of led module with direct supply of alternating current

FIELD: lighting.

SUBSTANCE: invention relates to LED light source module control circuit. Result is achieved by fact, that AC circuit for controlling LED brightness comprises rectifier and N cascades of DC circuits for control of LED. In DC circuit of i-th cascade for control of LED first end of i-th unit of selection of voltage and inlet end of i-th module of LED light source directly or indirectly receives output voltage of rectifier; end of voltage divider of i-th unit of selection of voltage is connected to second inlet end of i-th unit of switching; first inlet end of i-th unit of switching is connected to outlet end of i-th module of LED light source, and outlet end of i-th unit of switching, second end of i-th unit of selection of voltage and second output end of rectifier are grounded. When i-th unit of switching is switched on, modules of LED light source from first to i-th emit light. When i-th unit of switching is switched off, if i is less than N, modules of LED light source from first to (i+1)-th emit light, and if i is equal to N, modules of LED light source from first to N-th, stop emitting light. Such design of LED light source module with direct supply of alternating current also provides absence of flicker in case of AC voltage fluctuations.

EFFECT: technical result consists in provision of LED light source module circuit with direct supply of alternating current and, in particular brightness control circuit, which is compatible with semiconductor device of brightness control.

18 cl, 4 dwg

 



 

Same patents:

FIELD: electricity.

SUBSTANCE: invention is related to the sphere of electric engineering and intended for usage at sites of underground operations. The intrinsic safe luminaire comprises a body with at least one mounted light source that operates at low voltage, one device for light source control and one electric accumulator. The control device is designed with a potential selective light source with electric power, which is supplied from the electric accumulator or from an external electrical circuit, and with potential actuation of a light source by electrical power from the electrical accumulator when the external electric circuit is subjected to high current load and the electric accumulator is charged through the external electrical circuit if the external electrical circuit is loaded by low current.

EFFECT: enlargement of a range of technical means.

6 cl, 2 dwg

FIELD: physics, optics.

SUBSTANCE: invention relates to a device for driving a light-emitting diode (LED), an apparatus having said device and a method of driving a LED. In the first object, the disclosed device comprises an output stage for feeding current to the LED, wherein the current has an average value and a peak value, wherein the peak value, divided by the average value, forms a ratio, and an input stage for receiving a signal from a power supply unit, wherein the input stage includes a tool, having a resonance circuit for reducing the ratio through a frequency component to the signal or adaptation of the frequency component of the signal, which improves efficiency of the LED. According to the second object, in the method on the output stage, current is fed to the LED, wherein the current has an average value and a peak value, wherein the peak value, divided by the average value, forms a ratio, and an input stage for receiving a signal from a power supply unit, wherein the input stage includes a tool, having a resonance circuit for reducing the ratio by adding a frequency component to the signal or adaptation of the amplitude of the frequency component of the signal, which improves efficiency of the LED.

EFFECT: designing a device for driving a LED with high efficiency.

13 cl, 4 dwg

Lighting device // 2479165

FIELD: electricity.

SUBSTANCE: device comprises a light diode matrix connected via a control switch to a source of voltage of stabilised alternating current. The light diode matrix comprises one or several pairs of back-to-back connected branches from serially connected light diodes arranged on a common heat-removing substrate. The substrate is connected with an inlet of a temperature sensor, the output of which is connected to one of inlets of a control unit, which opens the control switch whenever the substrate temperature exceeds the specified level and closes it whenever temperature reduces to the specified level. Temperature is stabilised with accuracy determined by the value of discrecity of intervals n of a modulating signal. By switch opening it is possible to stop supply of voltage to light diodes and thus to reduce temperature of their heating. Due to stabilisation of light diode module substrate temperature, reliable operation of light diodes is ensured under effect of various destabilising factors.

EFFECT: higher reliability and longer life of a device.

3 dwg

Illumination device // 2476037

FIELD: electrical engineering.

SUBSTANCE: device contains a LED unit the power leads whereof are connected to the transformer secondary winding designed in the form of a heat-eliminating plate passed inside the core. The transformer primary winding is linked to a stabilised AC power supply. The LED unit consists of several pairs of anti-parallel connected LEDs. Installed on one of the plate sides projecting outside the transformer core are the anodes of LEDs of one switching-on direction, on the other such sides - those of the other. The LEDs' cathodes are respectively connected to the anodes of the opposite direction LEDs. With a large LEDs number, several identical transformers are used. In this case the primary windings of all the transformers are connected in series while the heat-eliminating plate passed through the cores of all the transformers represents their common secondary winding 2. Implemented in the device is the possibility of installation of numerous LEDs anodes on a common plate with simultaneous provision for identical currents flowing through the LEDs and uniform heating of the surface of the heat-eliminating plate and of the product as a whole.

EFFECT: enhanced efficiency of the unit LEDs cooling, improvement of weight and dimension indices and prime cost reduction.

2 cl, 3 dwg

FIELD: physics.

SUBSTANCE: device has a group of light-emitting diodes of different colours, including white. The disclosed device has apparatus for controlling light characteristics, a video capturing device with a camera, and apparatus for analysing and controlling light characteristics. The device also has an optical part which facilitates uniform distribution of brightness and illumination on the working surface and optimum blending of the radiation of red, blue and green light-emitting diodes. A liquid-crystal screen is used to set initial characteristics and control operating modes.

EFFECT: invention enables automation of changing the colour hue and brightness of radiation based on radiation colour coordinates by assigning circadian and circannian cycle of a person in a given range of geographic latitude and longitude, and monitoring and regulating the required level and uniformity of distribution of brightness and colour grade for the operator-assigned type of visual activities using the control device.

5 dwg

Led lamp // 2409916

FIELD: electricity.

SUBSTANCE: lamp includes inverter made in the form of frequency converter connected to in-series resonant circuit which consists of capacity and inductance of primary winding of resonant high-frequency step-up transformer with core or without core, high-potential output of high-voltage winding of transformer is connected to single-wire line; line includes n in-series connected primary windings of high-frequency step-down transformers (n=1, 2, 3…k); the last of primary windings is connected to natural capacity in the form of insulated conducting body, and secondary winding of each high-frequency step-down transformer is connected to bridge rectifier to the diagonal of bridge of which m light emitting diodes (m=1, 2, 3…r) are connected in series or l light emitting diodes (l=1, 2, 3…p) are connected in parallel. In the other version of LED lamp containing inverter which is made in the form of frequency converter and connected to in-series resonant circuit which consists of capacity and inductance of the first winding of resonant high-frequency step-up transformer with core or without core; high-potential output of high-voltage winding is connected by means of single-wire line to natural capacity in the form of insulated conducting body; to single-wire line there in series connected are n bridge rectifiers (n=1, 2, 3…k); to diagonal of each rectifier there connected in parallel are l light emitting diodes (l=1, 2, 3…p) or in-series m light emitting diodes (m=1, 2, 3…r), and number of m in-series connected light emitting diodes, n bridge rectifiers and l parallel connected light emitting diodes are connected to amplitude of current il and voltage Ul of single-wire line with the following ratios Ul > nUbr; Umn > kULED; il > iLED, where Ubr - output voltage of bridge rectifier; ULED - voltage of light emitting diode; iLED - current of light emitting diode.

EFFECT: reducing energy losses and improving operating reliability of lamp.

3 cl, 3 dwg

FIELD: motors and pumps.

SUBSTANCE: invention relates to methods and devices for operation of electrojet plasma engine. Method includes closure of power supply switch and feeding of voltage from power supply for anode and cathode, closure of launching switch and creation of current by at least in one coil of electrojet plasma engine and in connected in turn into electric circuit motor of winding of electro-valves for feeding of actuating medium into anode and cathode, time delay and following breaking of launching switch, formation of high-voltage pulse between cathode and igniter electrode, and ignition of launching discharge between igniter electrode and cathode, which then initiates ignition of main discharge between anode and cathode, with feeding of voltage of its high-voltage pulse simultaneously applied between anode and cathode, and also, through blocking capacitor, between igniter electrode and cathode, and coil is additionally used in the capacity of field magnet and closure of launching switch is implemented for time of its charging, which is taken into account in time delay before disconnection of launching switcher.

EFFECT: invention is directed to reliability growth of electrojet plasma engines and decreasing of its mass.

18 cl, 6 dwg

FIELD: lighting.

SUBSTANCE: photodiode illuminator contains a voltage converter, diode bridge rectifier, capacitor filter and photodiode, which are placed on a printed-circuit board. The board is located inside a transparent body, made with current-carrying leads. The body is made in the form of a pipe, and the photodiodes are uniformly distributed throughout the length of the printed-circuit board. Illuminator proposed is a finished product and can be used in bodies of lamps instead of daylight lamps and incandescent lamps.

EFFECT: expanding the functional capabilities.

7 cl, 4 dwg

Emitter // 2264053

FIELD: optics.

SUBSTANCE: device has protective assembly, mounted between transformer of electric energy and parallel/serial chains of emitting elements with current limiters. Current limiter is made in form of serially connected preventer, inductiveness coil, force key, control input of which through resistor is connected to output of voltage detector. Inputs of voltage detector and output of force key are connected to outputs of electric energy transformation device, which additionally has varistor, mounted in parallel between rectifier and power voltage stabilizer.

EFFECT: higher reliability.

3 cl, 3 dwg

FIELD: microwave-operated lighting fixtures and their power supplies.

SUBSTANCE: proposed power supply designed to feed electrodeless microwave-operated lighting fixture has high-voltage transformer that functions to transform standard ac power into high-voltage ac power and to supply this high-voltage ac power; voltage doubling unit used for converting high-voltage ac power into high-voltage dc power, for doubling dc current frequency, and for supplying dc power at high frequency. Power is supplied to magnetron at higher frequency for eliminating flicker effect.

EFFECT: enhanced stability of light emitted into environment.

4 cl, 7 dwg

FIELD: lighting equipment used for houses, offices, shops, etc.

SUBSTANCE: proposed lighting unit specially designed so that any user can easily control light and obtain any desired hue within comprehensive range has section assembled of light-emitting diodes, means for generating input control signal to shape one input control signal train, means for generating output control signal, and means for individual power control. Hue of lighting unit section built of light-emitting diodes continuously varies depending on magnitude of input control signal.

EFFECT: simplified control of light, enlarged range of hues that can be chosen.

6 cl, 3 dwg

FIELD: microwave-operated lighting fixtures and their power supplies.

SUBSTANCE: proposed power supply designed to feed electrodeless microwave-operated lighting fixture has high-voltage transformer that functions to transform standard ac power into high-voltage ac power and to supply this high-voltage ac power; voltage doubling unit used for converting high-voltage ac power into high-voltage dc power, for doubling dc current frequency, and for supplying dc power at high frequency. Power is supplied to magnetron at higher frequency for eliminating flicker effect.

EFFECT: enhanced stability of light emitted into environment.

4 cl, 7 dwg

Emitter // 2264053

FIELD: optics.

SUBSTANCE: device has protective assembly, mounted between transformer of electric energy and parallel/serial chains of emitting elements with current limiters. Current limiter is made in form of serially connected preventer, inductiveness coil, force key, control input of which through resistor is connected to output of voltage detector. Inputs of voltage detector and output of force key are connected to outputs of electric energy transformation device, which additionally has varistor, mounted in parallel between rectifier and power voltage stabilizer.

EFFECT: higher reliability.

3 cl, 3 dwg

FIELD: lighting.

SUBSTANCE: photodiode illuminator contains a voltage converter, diode bridge rectifier, capacitor filter and photodiode, which are placed on a printed-circuit board. The board is located inside a transparent body, made with current-carrying leads. The body is made in the form of a pipe, and the photodiodes are uniformly distributed throughout the length of the printed-circuit board. Illuminator proposed is a finished product and can be used in bodies of lamps instead of daylight lamps and incandescent lamps.

EFFECT: expanding the functional capabilities.

7 cl, 4 dwg

FIELD: motors and pumps.

SUBSTANCE: invention relates to methods and devices for operation of electrojet plasma engine. Method includes closure of power supply switch and feeding of voltage from power supply for anode and cathode, closure of launching switch and creation of current by at least in one coil of electrojet plasma engine and in connected in turn into electric circuit motor of winding of electro-valves for feeding of actuating medium into anode and cathode, time delay and following breaking of launching switch, formation of high-voltage pulse between cathode and igniter electrode, and ignition of launching discharge between igniter electrode and cathode, which then initiates ignition of main discharge between anode and cathode, with feeding of voltage of its high-voltage pulse simultaneously applied between anode and cathode, and also, through blocking capacitor, between igniter electrode and cathode, and coil is additionally used in the capacity of field magnet and closure of launching switch is implemented for time of its charging, which is taken into account in time delay before disconnection of launching switcher.

EFFECT: invention is directed to reliability growth of electrojet plasma engines and decreasing of its mass.

18 cl, 6 dwg

Led lamp // 2409916

FIELD: electricity.

SUBSTANCE: lamp includes inverter made in the form of frequency converter connected to in-series resonant circuit which consists of capacity and inductance of primary winding of resonant high-frequency step-up transformer with core or without core, high-potential output of high-voltage winding of transformer is connected to single-wire line; line includes n in-series connected primary windings of high-frequency step-down transformers (n=1, 2, 3…k); the last of primary windings is connected to natural capacity in the form of insulated conducting body, and secondary winding of each high-frequency step-down transformer is connected to bridge rectifier to the diagonal of bridge of which m light emitting diodes (m=1, 2, 3…r) are connected in series or l light emitting diodes (l=1, 2, 3…p) are connected in parallel. In the other version of LED lamp containing inverter which is made in the form of frequency converter and connected to in-series resonant circuit which consists of capacity and inductance of the first winding of resonant high-frequency step-up transformer with core or without core; high-potential output of high-voltage winding is connected by means of single-wire line to natural capacity in the form of insulated conducting body; to single-wire line there in series connected are n bridge rectifiers (n=1, 2, 3…k); to diagonal of each rectifier there connected in parallel are l light emitting diodes (l=1, 2, 3…p) or in-series m light emitting diodes (m=1, 2, 3…r), and number of m in-series connected light emitting diodes, n bridge rectifiers and l parallel connected light emitting diodes are connected to amplitude of current il and voltage Ul of single-wire line with the following ratios Ul > nUbr; Umn > kULED; il > iLED, where Ubr - output voltage of bridge rectifier; ULED - voltage of light emitting diode; iLED - current of light emitting diode.

EFFECT: reducing energy losses and improving operating reliability of lamp.

3 cl, 3 dwg

FIELD: physics.

SUBSTANCE: device has a group of light-emitting diodes of different colours, including white. The disclosed device has apparatus for controlling light characteristics, a video capturing device with a camera, and apparatus for analysing and controlling light characteristics. The device also has an optical part which facilitates uniform distribution of brightness and illumination on the working surface and optimum blending of the radiation of red, blue and green light-emitting diodes. A liquid-crystal screen is used to set initial characteristics and control operating modes.

EFFECT: invention enables automation of changing the colour hue and brightness of radiation based on radiation colour coordinates by assigning circadian and circannian cycle of a person in a given range of geographic latitude and longitude, and monitoring and regulating the required level and uniformity of distribution of brightness and colour grade for the operator-assigned type of visual activities using the control device.

5 dwg

Illumination device // 2476037

FIELD: electrical engineering.

SUBSTANCE: device contains a LED unit the power leads whereof are connected to the transformer secondary winding designed in the form of a heat-eliminating plate passed inside the core. The transformer primary winding is linked to a stabilised AC power supply. The LED unit consists of several pairs of anti-parallel connected LEDs. Installed on one of the plate sides projecting outside the transformer core are the anodes of LEDs of one switching-on direction, on the other such sides - those of the other. The LEDs' cathodes are respectively connected to the anodes of the opposite direction LEDs. With a large LEDs number, several identical transformers are used. In this case the primary windings of all the transformers are connected in series while the heat-eliminating plate passed through the cores of all the transformers represents their common secondary winding 2. Implemented in the device is the possibility of installation of numerous LEDs anodes on a common plate with simultaneous provision for identical currents flowing through the LEDs and uniform heating of the surface of the heat-eliminating plate and of the product as a whole.

EFFECT: enhanced efficiency of the unit LEDs cooling, improvement of weight and dimension indices and prime cost reduction.

2 cl, 3 dwg

Lighting device // 2479165

FIELD: electricity.

SUBSTANCE: device comprises a light diode matrix connected via a control switch to a source of voltage of stabilised alternating current. The light diode matrix comprises one or several pairs of back-to-back connected branches from serially connected light diodes arranged on a common heat-removing substrate. The substrate is connected with an inlet of a temperature sensor, the output of which is connected to one of inlets of a control unit, which opens the control switch whenever the substrate temperature exceeds the specified level and closes it whenever temperature reduces to the specified level. Temperature is stabilised with accuracy determined by the value of discrecity of intervals n of a modulating signal. By switch opening it is possible to stop supply of voltage to light diodes and thus to reduce temperature of their heating. Due to stabilisation of light diode module substrate temperature, reliable operation of light diodes is ensured under effect of various destabilising factors.

EFFECT: higher reliability and longer life of a device.

3 dwg

FIELD: physics, optics.

SUBSTANCE: invention relates to a device for driving a light-emitting diode (LED), an apparatus having said device and a method of driving a LED. In the first object, the disclosed device comprises an output stage for feeding current to the LED, wherein the current has an average value and a peak value, wherein the peak value, divided by the average value, forms a ratio, and an input stage for receiving a signal from a power supply unit, wherein the input stage includes a tool, having a resonance circuit for reducing the ratio through a frequency component to the signal or adaptation of the frequency component of the signal, which improves efficiency of the LED. According to the second object, in the method on the output stage, current is fed to the LED, wherein the current has an average value and a peak value, wherein the peak value, divided by the average value, forms a ratio, and an input stage for receiving a signal from a power supply unit, wherein the input stage includes a tool, having a resonance circuit for reducing the ratio by adding a frequency component to the signal or adaptation of the amplitude of the frequency component of the signal, which improves efficiency of the LED.

EFFECT: designing a device for driving a LED with high efficiency.

13 cl, 4 dwg

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