31results about How to "Stable dimming" patented technology

The invention discloses a rotary dimming mechanism, which relates to the functional characteristic or a part an illuminating device or a system thereof, in particular to a rotary dimming mechanism for changing the characteristic and distribution of luminescence by adjusting a part. The rotary dimming mechanism comprises a light shielding column 1, a worm wheel 2, a worm 3 and a stepping motor 4, wherein the worm wheel 2 is fixedly connected to the shaft end of the light shielding column 1; the worm 3 is fixedly connected to a revolving shaft of the stepping motor 4; the stepping motor 4 is fixedly connected to a vehicle lamp shell 5 through a fixing bracket 7; the stepping motor 4 is in meshed transmission connection with the light shielding column 1 through the worm 3 and the worm wheel 2; the light shielding column 1 rotates around a rotating center thereof, and shows different section shapes on the light path of a vehicle lamp; and the light shielding column is designed with different specific section shapes at different rotating angles, so that a light shielding form which is consistent with far and near light requirements is formed. The rotary dimming mechanism disclosed by the invention has the advantages of stable dimming process, lose dimming action noise, self-locking function, higher reliability and capability of realizing dimming of multiple light forms.

The invention discloses an intelligent dimming controller suitable for dimming in large-area spaces, including an internal dimming module and a bypass switch, and an air switch is connected between the internal dimming module and an external power supply; The internal dimming module described above includes an MCU main control module, an internal power supply, a dry contact module connected with the MCU main control module, a photocoupler connected with the MCU main control module, and a bidirectional thyristor circuit connected with the MCU main control module; The bidirectional thyristor circuit is internally connected with a choke coil, and the bidirectional thyristor circuit is connected to the load output board; a bypass switch is connected between the load output board and the air switch; the MCU main control module passes The 485 communication circuit is connected with the control terminal and the PC respectively; the 485 communication circuit and the dry contact module are respectively connected to two input pins of the MCU main control module; the described bidirectional thyristor circuit is connected to the MCU main control module Output pin; the dry contact module is connected to the current feedback module.

The present invention discloses an HUD brightness automatic regulation device and method in the automatic control technology field. The device comprises: a horizontal light sensor and a vertical light sensor, wherein the installation directions of the horizontal light sensor and the vertical light sensor are mutually perpendicular and the measuring ranges of the horizontal light sensor and the vertical light sensor are the same, and the vertical light sensor is provided with a light filter membrane; a microprocessor, wherein the microprocessor comprises an A / D processing module, a data processing module and a PWM module, the horizontal light sensor and the vertical light sensor are configured to convert the detected light brightness signals to digital signals through the A / D processing module and then transmit the digital signals to the data processing module, and the data processing module performs processing and calculation to obtain PWM digital quantity applied to the PWM module; the LED module, wherein the LED module comprises a LED driver and a LED lighting chain, and the PWM module controls the brightness of the LED lighting chain through the LED driver; an external rotary knob configured to transmit the brightness regulation signals to the A / D module for manual regulation of the brightness. The light regulation range is wide, and the light regulation is more smooth.

The invention relates to a fluorescent lamp dimming control circuit and a dimmable fluorescent lamp using the circuit. The control circuit comprises a feedback detection unit (1), a main control unit (2), a half-bridge drive unit (3) and an oscillation unit (4), wherein the feedback detection unit (1) comprises a current detection unit (101) which detects the working current of a fluorescent lamptube to obtain a sampling current and a voltage detection unit (102) which detects the working voltage of the fluorescent lamp tube to obtain a sampling voltage; and the main control unit (2) is usedto produce a first pulse and a second pulse with the same frequency, the same amplitude and opposite directions and controls and regulates the frequency of the first pulse and the second pulse according to the sampling current, the sampling voltage and externally input dimming control signals. The invention uses a voltage and current loop control circuit to realize dimming control, can accuratelycontrol the output power of the fluorescent lamp tube, and accurately controls output illumination, and the dimming is more continuous and stable.