31results about How to "Stable dimming" patented technology

A PWM generating section (32) for black insertion lighting control outputs a black insertion PWM pulse VBL for driving a fluorescent lamp (43) such that a black insertion period for unlighting the fluorescent lamp (43) and a period for lighting the fluorescent lamp (43) are provided in one vertical period, a PWM generating section (31) for luminance lighting control outputs a lighting control PWM pulse Vpwm1 for PWM driving the fluorescent lamp (43) so as to repeat lighting and unlighting in the lighting period, an AND circuit (33) outputs an inverter drive signal Vout1 where the lighting control PWM pulse Vpwm1 and the black insertion PWM pulse VBL are superposed, and an inverter (42) drives the fluorescent lamp (43) by applying a voltage corresponding to the inverter drive signal Vout1 to the fluorescent lamp (43).

The invention discloses a light adjustment device and method of an LED (Light Emitting Diode) high-voltage direct current centralized power supply system. The light adjustment device comprises a power source management module, a direct-current power supply module and N electric current adjustment modules, wherein N is greater than or equal to 1, the power source management module is connected with the control signal receiving end of the direct-current power supply module, the input ends of the N electric current adjustment modules are respectively connected with the positive output end of the direct-current power supply module, the negative output end of the direct-current power supply module is grounded, and the output end of each electric current adjustment module is connected with a load. The light adjustment device has the advantages that the unified light adjustment of multiple loads is realized by adjusting the output voltage value of the direct-current power supply module; and the independent light adjustment of each LED load is realized by adjusting sawtooth signals (vsaw1) in each electric current adjustment module. When a multi-level driving technology is adopted by the light adjustment device, the light emitting efficiency of LEDs is improved, and the long service life of the LED loads is ensured.

The invention discloses a switch-mode direct sliding dimmer that comprises a box body as well as a circuit board component, a dimming movement component and a radiating structure arranged in the box body; wherein, the circuit board component includes a circuit switching mechanism, a circuit and a plurality of power cords; wherein, the circuit switching mechanism switches the dimmed lighting equipment; the power cords are welded on the circuit for being connected with a power supply and a load; the dimming movement component includes a push rod cup and a reciprocating potentiometer; wherein, the push rod cup is arranged on a potentiometer handle of the reciprocating potentiometer; the potentiometer is positioned on the circuit board; and the resistance value of the reciprocating potentiometer is changed through the push rod cup so as to realize dimming effects. The radiating structure is a radiating panel, wherein, the heating elements in the circuit board is connected with the radiating panel, which facilitates a steady dimming, a radiating requirement of main elements and a expanded use of multi-lights.

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.

The invention provides a power supply device and a lighting device, which can stably adjust the light of a light-emitting element. A power supply device according to the present invention includes a control circuit and a detection circuit. The control circuit switches between a current control mode for controlling an output current supplied to the light emitting element to a target current and a voltage control mode for controlling an output voltage supplied to the light emitting element to a target voltage according to an input dimming signal. The light emitting element is dimmed. The detection circuit detects the output current and the output voltage, and the control circuit sets the target voltage when switching between the current mode and the voltage mode as a first voltage.

Disclosed is a lamp anti-disengagement light dimming mechanism capable of achieving inner and outer combined assembling. The lamp anti-disengagement light dimming mechanism is composed of a gear screw (1), a ball bulb fixing buckle (2), a limiting clamping piece (3), a sealing ring (4), a slipping gasket (5), a lamp shell (6), a ball base fixing buckle (7) and an adjusted workpiece (8). The lamp anti-disengagement light dimming mechanism is characterized in that the bottom face of a limiting column (1-2) of the gear screw (1) makes contact with the top face of a plastic thread (2-1) of the ball bulb fixing buckle (2), so that the upper light dimming limit is achieved; the connecting section (2-4) of the ball bulb fixing buckle (2) makes contact with the top face of a rotation-prevention groove (6-6) of the lamp shell (6), so that the lower light dimming limit is achieved. The lamp anti-disengagement light dimming mechanism is stable in light dimming, easy to machine, large in range between the upper adjusting limit and the lower adjusting limit and applicable to an adjusting screw with no gear, and no clamping groove is formed in the adjusting screw so that light dimming with barb meshed fixing when the limiting clamping piece is pressed in can be achieved.