39results about How to "Precise dimming" patented technology

A dimming mirror comprises a fixing base, an adjusting base, a lens, a first adjusting piece and a second adjusting piece. The adjusting base comprises a lens connecting part and a mounting part. The lens is fixed on the lens connecting part. The fixing base comprises a connecting part and a fixing part connected with the connecting part. The connecting part is connected with the mounting part of the adjusting base through the first adjusting piece. The second adjusting piece is connected with the fixing part. The first adjusting piece is used for adjusting the vertical position of the adjusting base. The second adjusting piece is used for adjusting the horizontal position of the fixing base, and accordingly the horizontal position of the adjusting base is adjusted. The lens is fixed through the adjusting base, through the two adjusting pieces, the adjusting base and the fixing base are connected together, the position of the adjusting base is adjusted in a matched mode, accordingly, accurate dimming is achieved under the situation that the structure is simple, the problem of polarization is avoided, the structure is simple, manufacturing, operation and mounting are convenient, and correspondingly, cost is lowered.

The invention discloses a digital linear dimming method for a high-power LED and belongs to the technical field of dimming methods. The digital linear dimming method for the high-power LED is characterized by comprising the following steps that firstly, a single-chip microcomputer receives a potentiometer signal, a current signal, a voltage signal and an LED temperature signal and conducts analog-to-digital conversion; secondly, based on the current signal, the voltage signal and the temperature signal, a luminance compensation coefficient A is calculated; thirdly, a lumen value L is calculated, and an output luminance value Lch which is generated after temperature compensation is calculated according to the luminance compensation coefficient A; fourthly, the current Io which needs to be supplied is obtained according to the Lch; fifthly, whether a sampled current signal is equal to the Io or not is judged, if yes, a result is output to a PWM control circuit, and if not, the result is adjusted and then output to the PWM control circuit. The digital linear dimming method for the high-power LED is convenient to operate, accurate in dimming, and suitable for dimming of the high-power LED.

The invention discloses a large power LED digital linear light modulation system and belongs to the technical field of an LED light modulation system. The large power LED digital linear light modulation system is technically characterized by comprising a filter and protection circuit, a PWM control circuit and an output filter circuit which are sequentially in circuit connection between a DC power source and an LED light source, wherein the PWM control circuit is in circuit connection with a single-chip microcomputer, the single-chip microcomputer is in circuit connection with a linear potentiometer, a current sampling amplification circuit is arranged between the output filter circuit and the LED light source, the current sampling amplification circuit is connected with the single-chip microcomputer, a welding point side edge of the LED light source is provided with a temperature sensor, and the temperature sensor is connected with the single-chip microcomputer through an ADC analog-to-digital converter. The large power LED digital linear light modulation system aims to have properties of compact structure and accurate light modulation and can be used for light modulation of a large power LED.

There is provided a method and corresponding lighting device (100), and a receiver, which employs code modulation which provides a compatibility of code modulation in a dimmable lighting system. The lighting device comprises means for dimming the output light (102), which employs multiple dimming modes, each representing dimming the light output from lighting device by means of a respective dimming method, and means for embedding a code in the light output (103). The means for embedding a code in the light output employs code modulation which is based on controlling the instantaneous dimmed light output from the lighting device such that the integrated value of the dimmed light output during a time period T is modulated to embed the code. The code may then subsequently be extracted from the modulated light by means of an integrate-and-dump process at a receiver, without knowledge of the dimming method and / or dimming level of the lighting device.

A dimming mirror, the dimming mirror includes a fixing seat, an adjusting seat, a lens, a first adjusting part and a second adjusting part, the adjusting seat includes a lens connecting part and a mounting part, the lens is fixed on the lens connecting part On the part, the fixed seat includes a connecting part and a fixed part connected to the connecting part, the connecting part and the installation part of the adjusting seat are connected through the first adjusting part, and the second adjusting part is connected to the fixed part, and the first adjusting part is used to adjust The vertical position of the adjustment base, the second adjustment member is used to adjust the horizontal position of the fixed base, thereby adjusting the horizontal position of the adjustment base. The present invention fixes the lens through the adjusting seat, and then connects the adjusting seat and the fixing seat together through two adjusting parts and cooperates to adjust the position of the adjusting seat, thereby realizing precise light adjustment with a simple structure, avoiding the problem of polarization, and Due to the simple structure, the manufacturing, operation and installation are facilitated, and the cost is correspondingly reduced.

The present invention provides a dimmable LED driving circuit and driving method, which controls the input current in the first power stage circuit through the input current control circuit to be a square wave signal in the conduction time interval of the thyristor, and its peak value is It is a constant value and meets the minimum load current requirement of the electronic transformer, and its valley value is zero; during the turn-off time interval of the silicon controlled rectifier, the input current remains zero. This can ensure that the load current of the electronic transformer is above its minimum load current, thus maintaining normal operation during the working process, avoiding the problem of LED load flickering caused by the shutdown of the electronic transformer; in addition, the dimming signal generation circuit detects the input The current information is used to obtain the dimming signal representing the conduction angle information of the thyristor, which realizes the precise dimming of the LED load, with a wide dimming range and good effect; finally, the output current control circuit realizes the constant current control of the LED load current , so as to ensure the stability of the LED load brightness.

The invention relates to an AC phase-cut digital dimming control device and a control method. The device comprises a zero-crossing detection circuit, an MCU main control circuit, a drive circuit and a phase-cut dimming circuit, and the MCU main control circuit is used for receiving The zero-crossing signal detected by the zero-crossing detection circuit, and output a zero-crossing compensation control signal according to the zero-crossing signal; the driving circuit is used to receive the zero-crossing compensation control signal output by the MCU main control circuit, and respond to the zero-crossing compensation control signal. The compensation control signal performs level amplitude conversion and outputs a MOS / IGBT drive level signal; the phase-cut dimming circuit is used for receiving the MOS / IGBT drive level signal output by the drive circuit, and according to the MOS / IGBT drive level signal The drive level signal outputs a phase-cut control signal to the lamp to be dimmed, so as to perform phase-cut dimming of the lamp to be dimmed. The present invention can realize precise dimming by outputting a phase-cut control signal to the lamp to be dimmed in the next cycle, so as to perform phase-cut dimming of the lamp to be dimmed, thereby improving the accuracy of phase-cut dimming.

In one embodiment, a light-emitting diode (LED) driver can include: (i) a reference voltage control circuit configured to provide a reference voltage signal in response to an enable signal; (ii) a current control circuit configured to control an output current of the LED driver in response to the reference voltage signal; and (iii) the LED driver being configured to drive an LED load when the enable signal is active.