Car lamp circuit formed by utilizing triode amplification principle
By using an amplifier circuit composed of multiple transistors, the problem of complex and costly vehicle headlight control circuits in the prior art is solved, and simple and low-cost control of headlight brightness changes is achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHANGZHOU XINGYU AUTOMOTIVE LIGHTING SYST CO LTD
- Filing Date
- 2025-04-23
- Publication Date
- 2026-04-21
AI Technical Summary
Existing technologies for controlling changes in vehicle headlight brightness use complex and costly control circuits with chips such as MCUs, and problems are not easily detected.
An amplifier circuit using multiple transistors, including a filter module, an inverter, and a transistor amplifier module, utilizes the amplification principle of transistors to achieve changes in the brightness of vehicle lights. The circuit is simple and low in cost.
It enables simple control of headlight brightness, reduces costs, and makes it easy to identify and troubleshoot circuit problems.
Smart Images
Figure CN224154385U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a vehicle lamp circuit that utilizes the amplification principle of a transistor. Background Technology
[0002] In existing technologies, to achieve simple control of vehicle lights, such as creating brightness variations, chips like MCUs are typically used. This approach is a good choice for implementing more complex brightness variations. In simpler cases, such as achieving sinusoidal brightness variations, a simpler circuit utilizing transistor amplification can be used.
[0003] In some simpler cases, such as making the headlights achieve a sine wave-like brightness change, using MCU chips or other chips to control the headlights is more complex, more expensive, and the cause of problems is not easy to find. Utility Model Content
[0004] To address the shortcomings of the existing technology, this utility model provides a vehicle headlight circuit that utilizes the amplification principle of transistors. By using an amplification circuit composed of multiple transistors, the brightness of the headlights can be varied in a sine wave-like manner. The method is novel, the circuit is simple, the cost is low, and it is easy to find the cause of any problems in the circuit.
[0005] This utility model provides a vehicle lamp circuit based on the transistor amplification principle. The circuit comprises a DC power supply, a filter module, an inverter, a transistor amplifier circuit module, and a lamp board module. The transistor amplifier circuit module includes an input terminal and an output terminal. The filter module and the inverter are connected in parallel via the DC power supply and then respectively connected to the input terminal of the transistor amplifier circuit module. The output terminal of the transistor amplifier circuit module is connected to the lamp board module.
[0006] The circuit of the filtering module uses a TVS diode D1 to suppress the input surge voltage and current;
[0007] The transistor amplifier circuit module consists of two NPN transistors, four resistors, and five capacitors. The two NPN transistors are Q1 and Q2, the four resistors are R1, R2, R3, and R4, and the five capacitors are C1, C2, C3, C4, and C5.
[0008] Resistor R1 connects the power supply and the base, providing the base bias voltage. Resistor R2 connects the base and ground, and together with R1, determines the base voltage. Resistor R3 converts the collector current into voltage, providing voltage gain and limiting the collector current. Resistor R4 provides negative feedback. Capacitor C5 bypasses the AC signal, preventing R4 from generating negative feedback to the AC signal. Capacitor C3 isolates the DC component of the input signal, allowing only the AC signal to enter the base. Capacitor C4 isolates the DC component of the output signal, allowing only the AC signal to be transmitted to the load.
[0009] The beneficial effects of this utility model are: This utility model utilizes the amplification principle of transistors and uses a composite transistor amplifier circuit composed of transistors to control vehicle lights. The method is novel and the cost is low. Attached Figure Description
[0010] A more complete understanding of the present invention and its accompanying advantages and features will be more readily apparent from the accompanying drawings and the following detailed description, wherein:
[0011] Figure 1 This is a schematic diagram of the principle of this utility model;
[0012] Figure 2 This is a schematic diagram of the filter module structure in this utility model;
[0013] Figure 3 This is a schematic diagram of the transistor amplifier circuit structure in this utility model;
[0014] Figure 4 This is a schematic diagram of the lamp board module structure in this utility model. Detailed Implementation
[0015] To make the content of this utility model clearer and easier to understand, the following description, in conjunction with the accompanying drawings, further illustrates the content of this utility model. Of course, this utility model is not limited to this specific embodiment, and common substitutions well-known to those skilled in the art are also covered within the protection scope of this utility model.
[0016] like Figure 1 As shown, a vehicle headlight circuit utilizing the transistor amplification principle is characterized by comprising a DC power supply, a filter module, an inverter, a transistor amplifier circuit module, and a headlight board module. The transistor amplifier circuit module includes an input terminal and an output terminal. The filter module and the inverter are connected in parallel via the DC power supply and then respectively connected to the input terminal of the transistor amplifier circuit module. The output terminal of the transistor amplifier circuit module is connected to the headlight board module. One path of the DC power supply passes through the filter module to power the transistor amplifier circuit, while the other path is converted to AC power by the inverter to power the transistor amplifier circuit. The output of the transistor amplifier circuit is connected to the headlight board.
[0017] like Figure 2 As shown, the circuit uses a TVS diode D1 to suppress the input surge voltage and current, capacitors C1 and C2 to filter, and diode D2 for rectification.
[0018] like Figure 3 As shown, two NPN transistors Q1 and Q2 form a composite transistor. The base current i of the composite transistor is... B Equal to the base current i of transistor Q1 B1 collector current i C Equal to the collector current i of transistor Q2 C2 With the collector current i of transistor Q1 C1 The sum of the base current i of transistor Q2. B2 Equal to the emitter current i of transistor Q1 E1 The composite transistor composed of transistors Q1 and Q2 greatly improves the amplification factor of the circuit, which is very significant for amplifying weak AC signals.
[0019] Resistor R1 connects the power supply and the base, providing the base bias voltage. R2 connects the base and ground, and together with R1, determines the base voltage, ensuring the transistor operates in the amplification region. Collector resistor R3 converts the collector current into voltage, providing voltage gain and limiting the collector current. Emitter resistor R4 provides negative feedback, stabilizing the operating point and reducing the impact of temperature on amplification performance. Emitter bypass capacitor C5 bypasses the AC signal, preventing R4 from generating negative feedback on the AC signal and improving AC gain. Input coupling capacitor C3 isolates the DC component of the input signal, allowing only AC signals to enter the base. Output coupling capacitor C4 isolates the DC component of the output signal, allowing only AC signals to be passed to the load.
[0020] like Figure 4 As shown, the capacitor connected in parallel with the LED serves as a decoupling element.
[0021] The entire circuit works by providing a suitable quiescent operating point to the transistor amplifier circuit via a DC input. The AC signal obtained by the inverter is amplified by the transistor amplifier circuit and then supplies power to the LED board, causing the brightness of the LEDs on the board to change.
Claims
1. A vehicle lamp circuit composed of a triode amplification principle, characterized by, The circuit includes a DC power supply, a filter module, an inverter, a transistor amplifier module, and a lamp board module. The transistor amplifier module has an input terminal and an output terminal. The filter module and the inverter are connected in parallel through the DC power supply and then connected to the input terminal of the transistor amplifier module. The output terminal of the transistor amplifier module is connected to the lamp board module. The filter module uses a TVS diode D1 to suppress the input surge voltage and current. The transistor amplifier circuit module consists of two NPN transistors, four resistors, and five capacitors. The two NPN transistors are Q1 and Q2, the four resistors are R1, R2, R3, and R4, and the five capacitors are C1, C2, C3, C4, and C5. Resistor R1 is connected to the power supply and the base, providing the base bias voltage, and resistor R2 is connected to the base and ground, together with R1, determining the base voltage. The resistor R3 converts the collector current into voltage; the resistor R4 provides negative feedback; the capacitor C5 bypasses the AC signal to prevent R4 from generating negative feedback to the AC signal; the capacitor C3 isolates the DC component of the input signal; and the capacitor C4 isolates the DC component of the output signal.