40results about How to "To achieve the purpose of dimming" patented technology

The invention discloses a dimming circuit compatible with a silicon controlled rectifier dimmer and a control method. The dimming circuit includes an input voltage source, a rectification circuit, the silicon controlled rectifier dimmer, a dimming circuit and an output circuit, wherein the input voltage source is connected with the rectification circuit and the silicon controlled rectifier dimmer respectively, the rectification circuit is connected with the dimming circuit, the dimming circuit is connected with the output circuit, and the output circuit includes an isolation transformer, a switch tube, a third sampling resistor, a flyback diode, a filtering capacitor and an output LED load. The dimming circuit compatible with the silicon controlled rectifier dimmer is characterized in that the dimming circuit includes a sampling circuit used for sampling the phase-cut angle of the silicon controlled rectifier dimmer, a control and logic circuit which is controlled by the phase-cut angle, and a phase-cut angle setting circuit which can control the switching on and switching off of the switch tube according to the status of an inputted phase-cut angle. With the dimming circuit compatible with the silicon controlled rectifier dimmer of the invention adopted, the problem of flicker appearing in a traditional dimming process can be effectively solved, and at the same time, a dimming purpose can be achieved.

The invention discloses an environment-friendly temperature-controlled dimming glass and a preparation method thereof. It comprises a first glass sheet and a second glass sheet that are consistent in structure and are hermetically bonded. The first glass sheet is provided with a hydrophilic region and a hydrophobic region. The two glass sheets are provided with a hydrophilic area and a hydrophobic area, and the hydrophilic area is adjacent to the hydrophobic area. The hydrophilic area and the hydrophobic area on the first glass sheet are located on the surface layer close to the second glass sheet. The hydrophilic area on the second glass sheet The water area and the hydrophobic area are located on the surface layer close to the first glass sheet, and a reflective condensation drop layer is arranged in the hydrophilic area; the structure is reliable, the preparation is simple, the cost is low, and the performance is good, and the saturated humidity of the air at different temperatures is different. Features, through the change of external temperature to change the condensation and evaporation of water vapor in the air, and the condensed droplets can refract light, and then adjust the luminosity of the glass, reduce the price of the dimming glass, and make the dimming glass more environmentally friendly.

The invention relates to an air filtration composite heat-insulation dimming window, comprising a composite heat-insulating profile window frame, a window-type air filter valve and an air-conditioning glass; The profile center column, the window air filter valve includes a filter valve frame, an alloy magnetic conductive air curtain support net, a filter element, an electromagnet, a permanent magnet, a windproof curtain and a windproof curtain rolling mechanism, and the middle air-conditioning light glass includes tempered glass. Glass, multi-level dimming film and multi-level dimming film sealing tension mechanism. The invention can filter the air entering the room from the outside to realize the convective filtration of the indoor and outdoor air; at the same time, the multi-level dimming film moves up and down to control the amount and amount of ultraviolet, visible and near-infrared light in the sunlight entering the room. Proportion, the optical parameters of the insulating glass can be adjusted, and the wind pressure resistance, air tightness, water tightness, thermal insulation performance, sound insulation performance and thermal insulation performance of the window are higher than the national standards.

A method for suppressing the influence of LED nonlinear distortion on the performance of visible light communication. The main steps are: (1) mapping a modulation symbol sequence, and the output signal satisfies Hermitian symmetry; (2) multiplying the mapped signal by a scale change factor; (3) ) to perform IFFT, and then slice and decompose the optical OFDM symbols to obtain multiple decomposed symbols with smaller amplitudes; (4) decompose the symbols serially framing; (5) the receiving end serially receives all the optical OFDM symbols in a frame in sequence , respectively delayed until the symbols are aligned; (6) the corresponding bits are added and combined into an optical OFDM symbol. The invention is easy to control the average power of the optical OFDM symbol, easy to synchronize, simple to realize, and easy to deploy.

The invention discloses an adjustable photocontrol circuit of an LED (light-emitting diode) lamp, which comprises a power supply conversion circuit capable of connecting an LED lamp load and a PWM (pulse width modulation) control circuit and is characterized in that the power supply conversion circuit comprises a voltage transformation circuit, a rectification filter circuit and an LED load control circuit, the output end of the PWM control circuit is sequentially connected with a diode D3 and a resister R3 in series, and the output end of the resister R3 is connected with a reference controlpoint (A) of the LED load control circuit. The standard control point (A) is an anodic control end of an opticalcoupler, a control end of a reference voltage source or a control end of a comparator. The PWM control circuit is powered by an auxiliary power supply or connected with the output end of the power supply conversion circuit. Because of the advantages, The invention can be applied to a similar laden control circuit of the LED lamp and the like.