Barricade warning light flashing circuit

The H1.9811 single-channel flash control integrated circuit from Wuxi Love Core Microelectronics Co., Ltd. is designed for controlling flashing warning lights in road barricades. It features an integrated internal RC oscillator, frequency divider, output buffer amplifier, shaping circuit, and power output circuit. The HL9811 circuit is housed in a T092 package and operates with a negative power supply. The flashing output connects to a 220V AC source, which is rectified by diodes VD1-VD4. This setup provides a direct input for the electric lamp, while another path includes a buck limit and voltage regulator that filters the output to provide 12V DC for the light control circuit and integrated flash.

The circuit utilizes a photosensitive resistor (Rl) and Darlington transistor pair (VT1, VT2) to create a power switch that responds to ambient light. During the day, Rl exhibits low resistance, turning off the Darlington pair and consequently the power switch, which prevents power loss and keeps the thyristor (VT4) off, causing the warning light to remain off. At night, Rl's resistance increases, allowing the Darlington pair to activate and provide the necessary 12V DC voltage for the follow-up circuit.

The H1.9811 generates a square wave pulse signal, which is amplified and used to control the thyristor (VT4) for the flashing operation of the warning light. The flash rate is controlled by the internal oscillator of the H1.9811, with an oscillation frequency adjustable between 0.5 to 2Hz. If a different frequency is required, customization may be necessary through the manufacturer. The circuit can support small plastic products, such as brake lights, with a power rating of 100W or less.

The design of the H1.9811 circuit allows for efficient operation in various lighting conditions, ensuring that the warning lights function effectively as intended for road safety applications. The integration of components such as the RC oscillator and Darlington transistors enhances the reliability and responsiveness of the circuit, making it suitable for use in outdoor environments where fluctuations in light can significantly affect performance.Using Wuxi love core Microelectronics Co., Ltd. H1.9811 single Chan flash control integrated road barricades made of flashing warning lights, HL9811 integrated internal RC oscillator, frequency divider, the output buffer amplifier punching, shaping circuit, power output circuit. HL9811 1 '[J-92 and I'CB black paste soft decision means two kinds, the circuit hired T () - 92 package, it O pin Negative power supply v ,,; feet flash output () LT; feet to stop power supply terminal V ...

by 220v AC after VDl-VD4 rectifier, a direct road E electric lamp as the source, and the other path R, buck limit, vs regulator with (1 filtered wave output 12V DC voltage for light control circuit, integrated flash and other electrical path .VT1, VT2 Darlington cares constitute the photosensitive resistor Rl, and the resistor R, the power switch is composed of a light twist, daytime RI. irradiated by light exhibits low resistance, so Darling Leighton tube (ie, VT1, VT2) off, the power switch is turned off, the subsequent circuit as a loss of power is not T, thyristor VT4 also turned off, the warning light E small light.

when night comes, R1J resistance increases, VTI the substrate potential but also with the increased proliferation of Darlington when a certain value .V ri and VT2 composed of MOSFET, provides follow-up circuit work must be 12V DC voltage. when H1.9811 must obtain a DC voltage is normal , its output on the output square wave pulse signal after amplification was added to unravel diode VT3 VT4 of thyristor f J Ying, so VT4 gap opened and closed so powerful horse movement warning women E flashes.

flashing lamp H zygomatic rate by the manifold H1.98 children control the internal oscillator, the oscillation frequency in the range of 0 5 ~ 2Hz inner circle can not be adjusted by external components Cambodia. If the oscillation frequency is too inappropriate, may "require manufacturers to customize. 4 bite with W]] A, ' 600V unidirectional small plastic products such as brake pipes and other .F MCR100-8 Journal of 100W or less red incandescent bulbs.