Light follower

Abstract

The utility model discloses a follow-up light device which structurally comprises a flashing light HR and a follow-up light control circuit, the follow-up light control circuit comprises a voltage division circuit formed by a resistor R1 and a variable resistor R2, a series circuit formed by reversely connecting two photodiodes D1 and D2, an integrated chip with the model of TDA2822M and an indicator light HL arranged on a vehicle instrument panel; the voltage division circuit and the photodiode series circuit are connected in parallel to the positive and negative electrodes of the power supply; a pin 5 and a pin 7 of the integrated chip are jointly connected to an intermediate node of the voltage division circuit, a pin 6 and a pin 8 are jointly connected to an intermediate node of the light emitting diode series circuit, a pin 1 is connected with a negative electrode of an indicating lamp HL through a diode D, a pin 3 is connected with a positive electrode of the indicating lamp HL, a pin 2 is connected with a positive electrode of a power supply, and a pin 4 is connected with a negative electrode of the power supply; the flashing lamp HR comprises a lamp bead and a lampshade; the two photodiodes D1 and D2 are arranged in a lampshade of the flashing lamp HR, and the photodiode D1 is close to a lamp bead. According to the utility model, a driver can know the change of the flashing lamp according to the change of the indicating lamp at any time.

Description

Technical Field

[0001] This utility model relates to a device that changes with the state of a lamp, specifically a light follower. Background Technology

[0002] Airport operation management regulations require that all vehicles operating on or supporting the apron be equipped with warning lights, which must be illuminated day and night. Since the driver is inside the vehicle while the warning lights are mounted on the exterior roof, a malfunction in the warning lights may go unnoticed by the driver, potentially leading to operational problems. Furthermore, if the driver is excessively focused on the warning lights and extends their head out of the window to observe them, it will inevitably affect safe driving and could even pose a potential risk of traffic accidents. Utility Model Content

[0003] The purpose of this invention is to provide a light follower to solve the problem that drivers cannot always see the status of warning lights.

[0004] The technical solution of this utility model is as follows:

[0005] A light follower includes a strobe lamp (HR) and a light follower control circuit;

[0006] The light-following control circuit includes a voltage divider circuit composed of resistor R1 and variable resistor R2, a series circuit composed of two photodiodes D1 and D2 connected in reverse, an integrated chip of model TDA2822M, and an indicator light HL for installation on the vehicle dashboard. The voltage divider circuit and the photodiode series circuit are connected in parallel to the positive and negative terminals of the power supply. Pins 5 and 7 of the integrated chip are connected to the middle node of the voltage divider circuit. Pins 6 and 8 of the integrated chip are connected to the middle node of the light-emitting diode series circuit. Pin 1 of the integrated chip is connected to the negative terminal of the indicator light HL through diode D. Pin 3 of the integrated chip is connected to the positive terminal of the indicator light HL. Pin 2 of the integrated chip is connected to the positive terminal of the power supply. Pin 4 of the integrated chip is connected to the negative terminal of the power supply.

[0007] The strobe light HR includes an LED and a lamp cover; the photodiode D1 in the light-following control circuit is disposed inside the lamp cover of the strobe light HR and is close to the LED.

[0008] Furthermore, the negative terminal of photodiode D1 is connected to the positive terminal of the power supply, and the negative terminal of photodiode D2 is connected to the negative terminal of the power supply.

[0009] Furthermore, the photodiode D2, the TDA2822M chip, the resistor R1, and the variable resistor R2 are disposed inside the lampshade of the strobe lamp HR.

[0010] In this invention, the resistance of photodiode D1 in the light-following control circuit changes according to the brightness of the strobe light. This changes the voltage at pins 5, 6, 7, and 8 of the TDA2822M chip, thereby altering the output levels at pins 1 and 3. The strobe light illuminates when it illuminates and extinguishes when it extinguishes. By placing the indicator light on the vehicle's dashboard, the driver can easily monitor the strobe light's status without needing to stick their head out of the window. This allows for timely detection of any strobe light malfunctions or failure to illuminate.

[0011] The light follower is designed to reflect the status of the external warning lights to the driver inside the vehicle, facilitating driver observation and serving as a reminder and warning. The transmission method is not based on collecting electrical signals or simple circuit series connection; instead, it uses a specially developed electronic sensor to collect information about the warning light source, amplifies it through comparison, and transmits it to the vehicle interior, where it is displayed via indicator lights. Power can be drawn from the vehicle's onboard charger, making installation convenient. This product's electronic circuitry collects the warning light source day and night, unaffected by time or ambient light sources, and adaptable to a wide range of ambient light levels. This enhances safety margins during production and maintenance. Attached Figure Description

[0012] Figure 1 This is the circuit diagram of this utility model. Detailed Implementation

[0013] The present invention will now be described in further detail.

[0014] like Figure 1 As shown, the structure of the light follower of this utility model includes a strobe lamp HR and a light follower control circuit.

[0015] The light-following control circuit includes a voltage divider circuit consisting of resistor R1 and variable resistor R2, a series circuit consisting of two photodiodes D1 and D2 connected in reverse, an integrated chip of model TDA2822M, and an indicator light HL for setting on the vehicle dashboard.

[0016] The voltage divider circuit and the photodiode series circuit are connected in parallel to the positive and negative terminals of the power supply; pins 5 and 7 of the integrated chip are connected to the middle node of the voltage divider circuit, pins 6 and 8 of the integrated chip are connected to the middle node of the LED series circuit, pin 1 of the integrated chip is connected to the negative terminal of the indicator light HL via diode D, pin 3 of the integrated chip is connected to the positive terminal of the indicator light HL, pin 2 of the integrated chip is connected to the positive terminal of the power supply, and pin 4 of the integrated chip is connected to the negative terminal of the power supply; the strobe light HR includes an LED and a lamp cover; the two photodiodes D1 and D2 in the light-following control circuit are placed inside the lamp cover of the strobe light HR, with photodiode D1 close to the LED.

[0017] The positive terminals of photodiode D1 and photodiode D2 are connected together, the negative terminal of photodiode D1 is connected to the positive terminal of the power supply, and the negative terminal of photodiode D2 is connected to the negative terminal of the power supply.

[0018] Pin 7 of the integrated chip is connected to the end closest to resistor R1, and pin 5 of the integrated chip is connected to the end closest to the variable resistor R2; pin 8 of the integrated chip is connected to the end closest to photodiode D1, and pin 6 of the integrated chip is connected to the end closest to photodiode D2. The anode of diode D is connected to the cathode of indicator light HL, and the cathode of diode D is connected to pin 1.

[0019] The photodiode D2, TDA2822M chip, resistor R1, and variable resistor R2 of this invention are installed inside the lampshade of the strobe lamp HR, which saves space.

[0020] The power supply for this invention is taken from the vehicle's DC 12V power supply. The photodiode used in this invention is a 5mm QT523C-EE1 5800B; resistor R1 is 1 / 4W, 10K; variable resistor R2 is a horizontal adjustable 503; indicator light HL is DC 12V; the strobe light is placed on the roof of the vehicle. Photodiode D1 can be covered with black heat-shrink tubing to reduce interference from strong ambient light, leaving only the top exposed to collect the strobe light source.

[0021] Pins 2 and 4 of the TDA2822M chip are power input terminals, with pin 2 connected to the positive terminal and pin 4 to the negative terminal. Pin 1 is connected to the negative terminal of the indicator light HL. Pin 5 is the negative input terminal of signal 2, and pin 6 is the positive input terminal of signal 2. Pin 7 is the positive input terminal of signal 1, and pin 8 is the negative input terminal of signal 1. When the voltage at pin 7 is greater than that at pin 8, pin 1 outputs a high level (positive voltage), and vice versa. When the voltage at pin 6 is greater than that at pin 5, pin 3 outputs a high level (positive voltage), and vice versa.

[0022] When the power is on, the voltage at pins 6 and 8 is approximately 12V, and the voltage at pins 5 and 7 is approximately 7.3V. When the strobe light is powered on, the chip simultaneously receives power and begins operation. Since photodiode D1 is reverse-biased and photodiode D2 is forward-biased, the voltage at pins 6 and 8 of the integrated chip is significantly affected by photodiode D1. Because photodiode D1 is close to the strobe light, its resistance decreases, and the voltage at pins 6 and 8 is approximately 12V. Comparing the voltages using the TDA2822M, the voltage at pin 8 is greater than that at pin 7, resulting in a negative output voltage at pin 1; the voltage at pin 6 is greater than that at pin 5, resulting in a positive output voltage at pin 3. At this point, the indicator light HL illuminates.

[0023] When the strobe light HR interval turns off: the resistance of D1 increases, and the voltage between pins 6 and 8 to ground is approximately 0V. Using the TDA2822M voltage comparison, the voltage at pin 8 is less than that at pin 7, so pin 1 outputs a high level (positive); the voltage at pin 6 is greater than that at pin 5, so pin 3 outputs a low level (negative). Due to the reverse cutoff of the Schottky diode SR2200, the indicator light HL is not energized. This creates a flashing cycle. Even during the day, because the strobe light's cover is a colored, semi-transparent cover (e.g., yellow, blue, and red), light does not completely penetrate the cover. Therefore, D1's resistance does not decrease due to light, preventing the circuit from conducting. Photodiode D1 is unaffected by the environment; it is only affected by the strobe light's illumination. The integrated chip, by comparing voltages, ensures the circuit operates in a stable state and displays the strobe light's status by acquiring its signal.

Claims

1. A light follower, characterized in that, Including the strobe light HR and the light-following control circuit; The light-following control circuit includes a voltage divider circuit composed of resistor R1 and variable resistor R2, a series circuit composed of two photodiodes D1 and D2 connected in reverse, an integrated chip of model TDA2822M, and an indicator light HL for installation on the vehicle dashboard. The voltage divider circuit and the photodiode series circuit are connected in parallel to the positive and negative terminals of the power supply. Pins 5 and 7 of the integrated chip are connected to the middle node of the voltage divider circuit. Pins 6 and 8 of the integrated chip are connected to the middle node of the light-emitting diode series circuit. Pin 1 of the integrated chip is connected to the negative terminal of the indicator light HL through diode D. Pin 3 of the integrated chip is connected to the positive terminal of the indicator light HL. Pin 2 of the integrated chip is connected to the positive terminal of the power supply. Pin 4 of the integrated chip is connected to the negative terminal of the power supply. The strobe light HR includes an LED and a lamp cover; the photodiode D1 in the light-following control circuit is disposed inside the lamp cover of the strobe light HR and is close to the LED.

2. The optical follower according to claim 1, characterized in that, The negative terminal of photodiode D1 is connected to the positive terminal of the power supply, and the negative terminal of photodiode D2 is connected to the negative terminal of the power supply.

3. The optical follower according to claim 1, characterized in that, The photodiode D2, the TDA2822M chip, the resistor R1, and the variable resistor R2 are installed inside the lampshade of the strobe lamp HR.

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