Low cost headlight adjustment circuit

Abstract

This utility model discloses a low-cost headlight adjustment circuit, including a transistor unit Q9 composed of two transistors. The transistor unit Q9 has six pins: the first pin is the emitter of one transistor, the second pin is the base of one transistor, the sixth pin is the collector of one transistor, the third pin is the collector of the other transistor, the fourth pin is the emitter of the other transistor, and the fifth pin is the base of the other transistor. The first pin is grounded. A resistor R579 is electrically connected between the sixth and fifth pins. Capacitors C201 and C211 are electrically connected to the fourth pin. A resistor R583 and a capacitor C692 are electrically connected to the second pin. A resistor R580, a resistor R584, a capacitor C689, and a capacitor C691 are electrically connected to the third pin. A resistor R582 is electrically connected between resistors R580 and R584. A resistor R613 is connected in series with resistor R582, and a capacitor C693 is connected in parallel with resistor R613. The circuit of this invention can control and adjust the height of car headlights, and it is low in cost and highly accurate.

Description

Technical Field

[0001] This utility model relates to the field of vehicle lighting control circuit technology, and more specifically, to a low-cost headlight adjustment circuit. Background Technology

[0002] Automotive lighting systems are crucial for nighttime driving safety and comfort. However, changes in vehicle load (number of passengers, luggage weight, etc.) and dynamic driving conditions (acceleration, braking, incline / descent, etc.) can cause pitch changes in the vehicle's posture, thus altering the headlight beam angle. An unadjusted beam can create two dangerous situations: Insufficient illumination: The effective lighting distance is greatly reduced, the driver's field of vision is limited, and the risk of driving at night is increased.

[0003] Excessive illumination: The beam of light enters the eyes of oncoming or forward drivers, causing temporary glare and blindness, seriously threatening road traffic safety.

[0004] Therefore, it is necessary to control and adjust the height of the car headlights. Utility Model Content

[0005] This invention overcomes the shortcomings of the prior art and provides a low-cost headlight adjustment circuit. This circuit is based on a transistor to build a voltage divider resistor, which can output voltage values ​​at various levels to control the height of the vehicle's headlights, ensuring that the headlight beam can always illuminate the road ahead far enough, while avoiding glare to other road users.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A low-cost headlight adjustment circuit includes a transistor unit Q9 composed of two transistors. Transistor unit Q9 has six pins: the first pin is the emitter of one transistor, the second pin is the base of one transistor, the sixth pin is the collector of one transistor, the third pin is the collector of the other transistor, the fourth pin is the emitter of the other transistor, and the fifth pin is the base of the other transistor. The first pin is grounded. A resistor R579 is electrically connected between the sixth and fifth pins. Capacitors C201 and C211 are electrically connected to the fourth pin. A resistor R583 and capacitor C692 are electrically connected to the second pin. Resistors R580 and R584, capacitors C689 and C691 are electrically connected to the third pin. A resistor R582 is electrically connected between resistors R580 and R584. A resistor R613 is connected in series with resistor R582, and a capacitor C693 is connected in parallel with resistor R613.

[0007] Preferably, resistor R584 is connected in parallel with capacitor C689, and capacitor C691 is connected in parallel with capacitor C689.

[0008] Preferably, capacitor C691 is grounded.

[0009] Preferably, capacitor C201 and capacitor C211 are connected in series, and capacitor C211 is grounded.

[0010] Preferably, capacitor C692 is grounded.

[0011] Preferably, resistor R613 is grounded.

[0012] The beneficial effects of this utility model are: This invention achieves the function of outputting headlight adjustment signals (0-12V) at low cost by using dual transistors with logic level (3.3V / 5V) output. Furthermore, it uses RC filtering to filter the PWM signal into a level signal to control the headlight height, which has the advantages of low cost and high precision. Attached Figure Description

[0013] Figure 1 This is a circuit diagram of a specific embodiment of the present invention. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0015] like Figure 1 As shown, a low-cost headlight adjustment circuit includes a transistor unit Q9 composed of two transistors. Transistor unit Q9 has six pins: the first pin is the emitter of one transistor, the second pin is the base of another transistor, the sixth pin is the collector of one transistor, the third pin is the collector of the other transistor, the fourth pin is the emitter of the other transistor, and the fifth pin is the base of the other transistor. The first pin is grounded. A resistor R579 is electrically connected between the sixth and fifth pins. Capacitors C201 and C211 are electrically connected to the fourth pin. The first pin is electrically connected to resistor R583 and capacitor C692. The third pin is electrically connected to resistors R580 and R584, capacitors C689 and C691. Resistor R582 is electrically connected between resistors R580 and R584. Resistor R582 is connected in series with resistor R613. Resistor R613 is connected in parallel with capacitor C693. Resistor R584 is connected in parallel with capacitor C689. Capacitor C691 is connected in parallel with capacitor C689. Capacitor C691 is grounded. Capacitors C201 and C211 are connected in series. Capacitor C211 is grounded. Capacitor C692 is grounded. Resistor R613 is grounded.

[0016] By adopting the above technical solution, the circuit of this utility model uses dual transistors to achieve the function of outputting headlight adjustment signals (0-12V) at low cost logic level (3.3V / 5V), and uses RC filtering to filter the PWM signal into a level signal to control the headlight height. Specifically, resistor R583 and capacitor C692 are used for control signal filtering; resistor R579 and transistor unit Q9 act as switches to control the 12V output duty cycle; capacitors C201 and C211 are used for drive voltage filtering; resistor R580 is used for current limiting protection; and resistors R580, C689, C691, and R584 are used for output filtering to filter the PWM signal into a level signal; while resistors R582, R613, and C693 are used for diagnostic circuitry and voltage acquisition.

[0017] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A low-cost headlight adjustment circuit, characterized in that, The transistor unit Q9 consists of two transistors and has six pins. The first pin is the emitter of one transistor, the second pin is the base of the other transistor, the sixth pin is the collector of the first transistor, the third pin is the collector of the second transistor, the fourth pin is the emitter of the third transistor, and the fifth pin is the base of the third transistor. The first pin is grounded. A resistor R579 is electrically connected between the sixth and fifth pins. A capacitor C201 and a capacitor C211 are electrically connected to the fourth pin. A resistor R583 and a capacitor C692 are electrically connected to the second pin. A resistor R580, a resistor R584, a capacitor C689, and a capacitor C691 are electrically connected to the third pin. A resistor R582 is electrically connected between the resistors R580 and R584. A resistor R613 is connected in series with the resistor R582, and a capacitor C693 is connected in parallel with the resistor R613.

2. The low-cost headlight adjustment circuit according to claim 1, characterized in that, Resistor R584 is connected in parallel with capacitor C689, and capacitor C691 is connected in parallel with capacitor C689.

3. The low-cost headlight adjustment circuit according to claim 2, characterized in that, Capacitor C691 is grounded.

4. A low-cost headlight adjustment circuit according to claim 1, 2, or 3, characterized in that, Capacitors C201 and C211 are connected in series, and capacitor C211 is grounded.

5. A low-cost headlight adjustment circuit according to claim 4, characterized in that, Capacitor C692 is grounded.

6. A low-cost headlight adjustment circuit according to claim 4, characterized in that, Resistor R613 is grounded.

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