COLLIMATOR LED BRIGHTNESS CONTROL DEVICE (VARIANTS) Russian patent published in 2022 - IPC H05B45/10 

FIELD: LED technology.

SUBSTANCE: invention relates to devices for controlling the brightness of LEDs installed in collimator indicators of aircraft. The result is achieved by the fact that in the first variant, the device contains an LED driver (1), a spatial light modulator (2) with electrical addressing, two digital controllers: master (3) and slave (4), three N-channel power MOS transistors (5, 6, 7), three LEDs (8, 9, 10) in red, blue and green colors, an external interface chip (11), a resistor R1 (12), a resistor R2 (13), an N-channel MOS transistor of the logical level (14) and a control panel (15). In the second variant of the device, the external interface chip is made in the form of a programmable logic integrated circuit (41) and a DC voltage source (43) and a bipolar transistor (44) are added to the device. The device works as follows. Using the control panel, the pilot switches the external interface chip from day mode to night mode and back. When operating in day mode, a voltage of about 5 V is applied from the output of the external interface chip to the gate (39) of the N-channel MOS transistor of the logical level, sufficient to open the transistor. At the same time, the current from the sources (23, 24, 25) of the N-channel power MOS transistors goes to the “ground” through two parallel branches, on one of which there is a resistor R1, and on the other, a resistor R2 and an N-channel MOS transistor of the logical level. In this case, the current flowing through the LEDs has a maximum value, which ensures that the LEDs glow with the maximum brightness level. When working in the night mode, a voltage close to zero is applied from the output of the external interface chip to the gate of the N-channel MOS transistor of the logical level. The N-channel MOS transistor of the logic level is closed and the current from the sources (23, 24, 25) of the N-channel power MOS transistors goes to the “ground” only along one branch, on which the resistor R1 is located. Due to the large value of the resistance of the resistor R1, the current flowing through the LEDs has a minimum value, and the LEDs glow with the lowest possible brightness level.

EFFECT: ensuring the possibility of using a collimator indicator with LED illumination at night without the risk of blinding the pilot.

13 cl, 2 dwg