Control circuit of automotive integrated LED lights
By designing an LED light control circuit using MOS tubes and transistors in the car, it is possible that when one LED light bulb is damaged, other light bulbs cannot be lit. The body controller reminds the car owner to replace the light bulb, which solves the problem of LED light bulbs in the car The problem of not being able to detect in time when damaged improves driving safety and reduces costs.
Patent Information
- Application Number
- CN201710187892.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2017-03-27
- Publication Date
- 2025-02-21
- Estimated Expiration
- 2037-03-27
AI Technical Summary
When using multiple LED integrated light bulbs in cars, when one light bulb is damaged, the other light bulbs can still work, but car owners usually cannot notice the failure of the lamp in time, which poses safety risks.
A control circuit for integrated LED lights in automobiles was designed. Through the combination of MOS tube and transistor, when one LED light bulb is damaged, other light bulbs cannot be lit, and are connected to the body controller through transistors to remind the car owner to replace the light bulb.
It effectively improves the car owner's awareness of lamp failure, ensures driving safety, and achieves the effect suitable for popular application through simple circuit structure and low cost.
Smart Images
Figure CN108575008B_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of LED integrated lamps for automobiles, and in particular to a control circuit for an integrated LED lamp for automobiles. Background Art
[0002] LED has the advantages of high efficiency, low energy consumption, and green environmental protection, and is widely used in automotive lighting and civil lighting industries.
[0003] Considering the safety performance and installation structure, more and more automotive lamps are using LEDs. The design requirements for automotive products are relatively strict, especially for lamps related to safety performance. Therefore, when using multiple LED light sources for design, if one LED is damaged, the owner needs to replace the lamp to meet the requirements of automobile driving regulations and safety performance, but the price is relatively high. In order to meet the requirements of automobile regulations and optical requirements, it will become a difficult point that automotive lamp designers and manufacturers need to consider and break through to handle the coordination relationship of integrated LED bulbs in lamps. When using multiple LED integrated bulbs, when one bulb is damaged and cannot be lit, the other bulbs still work, but the owner usually cannot notice the failure of the lamp, so it brings inconvenience to the owner during driving.
[0004] If two LED integrated bulbs A+B work in parallel, when A is damaged, B can still work, and the owner may not notice the failure of the lamp, especially for the rear lights, which poses a safety hazard during driving. Therefore, it is necessary to provide a mechanism that when one of the LED lamps is damaged, both A and B lamps cannot work, and can be provided to the body control unit (BCM) for detection, reminding the owner to make timely changes to improve safety performance. Summary of the invention
[0005] The technical problem to be solved by the present invention is to provide a control circuit for an automotive integrated LED lamp, so that the car owner can promptly notice the failure of the lamp and improve driving safety.
[0006] In order to achieve the purpose of the present invention, the technical scheme adopted is: a control circuit of an automotive integrated LED lamp, including a MOS tube M1, a MOS tube M2, a transistor Q1, a transistor Q2, a transistor Q3, a diode D1 and a diode D2, the positive electrode of LED1 and the positive electrode of LED2 are both connected to the positive electrode of a battery, the negative electrode of LED1 is connected to the base of the transistor Q1, the negative electrode of LED2 is connected to the base of the transistor Q2, the collector of the transistor Q1, the positive electrode of the diode D1, the positive electrode of the transistor Q2 The collector and the positive electrode of the diode D2 are both connected to the positive electrode of the battery, the negative electrode of the diode D1 and the negative electrode of the diode D2 are both connected to the base of the transistor Q3, the collector of the transistor Q3 is respectively connected to the gate of the MOS tube M1 and the gate of the MOS tube M2, the source of the MOS tube M1 and the source of the MOS tube M2 are both grounded, the gate of the MOS tube M1 is connected to the positive electrode of the battery, the drain of the MOS tube M1 is connected to the base of the transistor Q1, and the drain of the MOS tube M2 is connected to the base of the transistor Q2.
[0007] As an optimization solution of the present invention, the transistor Q3 is connected to the vehicle body controller, and the vehicle body controller receives an on or off signal of the transistor Q3.
[0008] As an optimization solution of the present invention, the control circuit of the automotive integrated LED lamp also includes a resistor R0, a resistor R1 and a resistor R2, one end of the resistor R0 is connected to the positive electrode of the battery, the other end of the resistor R0 is connected to the gate of the MOS tube M1, one end of the resistor R1 is connected to the positive electrode of the battery, the other end of the resistor R1 is connected to the collector of the transistor Q1, one end of the resistor R2 is connected to the positive electrode of the battery, and the other end of the resistor R2 is connected to the collector of the transistor Q2.
[0009] As an optimization solution of the present invention, the control circuit of the automotive integrated LED lamp also includes a diode D3 and a diode D4, the anode of the diode D3 is connected to the cathode of LED1, the cathode of the diode D3 is connected to the base of the transistor Q1, the anode of the diode D4 is connected to the cathode of LED2, and the cathode of the diode D4 is connected to the base of the transistor Q2.
[0010] The present invention has positive effects: 1) The present invention uses MOS tubes and triodes to achieve the effect that when one LED bulb fails, other LED bulbs cannot light up, which can make the car owner more easily notice the failure of the lamp. At the same time, the fault reminder is given through BCM, so that the car owner can make timely changes, thereby improving driving safety;
[0011] 2) The circuit structure of the present invention is simple, the cost is low, and it is suitable for popular application. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0013] Figure 1 It is a circuit diagram of the present invention. DETAILED DESCRIPTION
[0014] like Figure 1 As shown, the present invention discloses a control circuit of an automotive integrated LED lamp, comprising a MOS tube M1, a MOS tube M2, a triode Q1, a triode Q2, a triode Q3, a diode D1 and a diode D2, the positive electrode of LED1 and the positive electrode of LED2 are both connected to the positive electrode of a battery, the negative electrode of LED1 is connected to the base of the triode Q1, the negative electrode of LED2 is connected to the base of the triode Q2, the collector of the triode Q1, the positive electrode of the diode D1, the collector of the triode Q2 and the diode D3 are connected to the positive electrode of the battery, and the positive electrode of LED2 is connected to the base of the triode Q2. The positive electrode of the tube D2 is connected to the positive electrode of the battery, the negative electrode of the diode D1 and the negative electrode of the diode D2 are connected to the base of the transistor Q3, the collector of the transistor Q3 is connected to the gate of the MOS tube M1 and the gate of the MOS tube M2 respectively, the source of the MOS tube M1 and the source of the MOS tube M2 are grounded, the gate of the MOS tube M1 is connected to the positive electrode of the battery, the drain of the MOS tube M1 is connected to the base of the transistor Q1, and the drain of the MOS tube M2 is connected to the base of the transistor Q2.
[0015] The transistor Q3 is connected to the vehicle body controller, and the vehicle body controller receives an on or off signal of the transistor Q3.
[0016] The control circuit of the automotive integrated LED lamp also includes a resistor R0, a resistor R1 and a resistor R2. One end of the resistor R0 is connected to the positive electrode of the battery, and the other end of the resistor R0 is connected to the gate of the MOS tube M1. One end of the resistor R1 is connected to the positive electrode of the battery, and the other end of the resistor R1 is connected to the collector of the transistor Q1. One end of the resistor R2 is connected to the positive electrode of the battery, and the other end of the resistor R2 is connected to the collector of the transistor Q2.
[0017] The control circuit of the automotive integrated LED lamp also includes a diode D3 and a diode D4, wherein the anode of the diode D3 is connected to the cathode of the LED1, the cathode of the diode D3 is connected to the base of the transistor Q1, the anode of the diode D4 is connected to the cathode of the LED2, and the cathode of the diode D4 is connected to the base of the transistor Q2.
[0018] The present invention controls two integrated LED lamps through MOS tube M1, MOS tube M2 and transistor Q3. More integrated LED lamps can be controlled by expanding MOS tube M1. The present invention only provides an example of controlling two LED lamps, namely LED1 and LED2. Under normal working conditions, the MOS tubes are all in a conducting state, and all LED bulbs are connected to the battery; when one of the LED bulbs is damaged and does not work, the transistor Q3 is turned on, the MOS tube is in a non-working state, the LED bulb cannot be connected to the negative pole of the battery, and all LED bulbs cannot be lit. At the same time, the transistor Q3 provides a signal to the BCM to remind the owner that the headlight is faulty.
[0019] like Figure 1 As shown, under normal working conditions, the working voltage is provided to the gate of the MOS through the resistor R0. When Ug>Us>0, the MOS tubes M1 and M2 are turned on, and the current is connected to the ground through LED1, LED2, diode D3 and diode D4 to light up. At this time, the transistor Q1 is at a high level. At this time, the transistors Q1 and Q2 are working, and the working current is basically shared by LED1 and LED2. The base of the transistor Q3 has no current, and the transistor Q3 does not work; when LED1 is damaged, the transistor Q1 is at a low level and cannot be turned on. The current provides the base current to the transistor Q3 through the diode D1, so that the transistor Q3 is turned on. At this time, the gate of the MOS tube M1 and the gate of the MOS tube M2 are both connected to the ground, and the on state cannot be achieved.
[0020] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. The control circuit of the automotive integrated LED lamp is characterized by: It includes MOS tube M1, MOS tube M2, transistor Q1, transistor Q2, transistor Q3, diode D1 and diode D2. The positive electrode of LED1 and the positive electrode of LED2 are both connected to the positive electrode of the battery. The negative electrode of LED1 is connected to the base of transistor Q1, the negative electrode of LED2 is connected to the base of transistor Q2, the negative electrode of diode D1 and the negative electrode of diode D2 are both connected to the base of transistor Q3, the base of transistor Q3 is connected to one end of resistor R3, the other end of resistor R3 is grounded, the collector of transistor Q3 is respectively connected to the gate of MOS tube M1 and the gate of MOS tube M2, the emitter of transistor Q3 is grounded, the source of MOS tube M1 and the source of MOS tube M2 are both grounded, The drain of the S tube M1 is connected to the base of the transistor Q1, and the drain of the MOS tube M2 is connected to the base of the transistor Q2; the transistor Q3 is connected to the body controller, and the body controller receives the on or off signal of the transistor Q3; the control circuit of the automotive integrated LED lamp also includes a resistor R0, a resistor R1 and a resistor R2, one end of the resistor R0 is connected to the positive electrode of the battery, the other end of the resistor R0 is connected to the gate of the MOS tube M1, one end of the resistor R1 is connected to the positive electrode of the battery, the other end of the resistor R1 is connected to the collector of the transistor Q1 and the positive electrode of the diode D1, one end of the resistor R2 is connected to the positive electrode of the battery, and the other end of the resistor R2 is connected to the collector of the transistor Q2 and the positive electrode of the diode D2.
2. The control circuit of the automotive integrated LED lamp is characterized by: The invention comprises a MOS tube M1, a MOS tube M2, a triode Q1, a triode Q2, a triode Q3, a diode D1, a diode D2, a diode D3 and a diode D4, wherein the positive electrode of LED1 and the positive electrode of LED2 are both connected to the positive electrode of the battery, the negative electrode of diode D1 and the negative electrode of diode D2 are both connected to the base of triode Q3, the base of triode Q3 is connected to one end of resistor R3, the other end of resistor R3 is grounded, the collector of triode Q3 is respectively connected to the gate of MOS tube M1 and the gate of MOS tube M2, the emitter of triode Q3 is grounded, the source of MOS tube M1 and the source of MOS tube M2 are both grounded, the drain of MOS tube M1 is connected to the base of triode Q1, the drain of MOS tube M2 is connected to the base of triode Q2; the triode Q3 is connected to the vehicle body control The vehicle body controller receives the on or off signal of the transistor Q3; the control circuit of the automobile integrated LED lamp also includes a resistor R0, a resistor R1 and a resistor R2, one end of the resistor R0 is connected to the positive electrode of the battery, the other end of the resistor R0 is connected to the gate of the MOS tube M1, one end of the resistor R1 is connected to the positive electrode of the battery, the other end of the resistor R1 is connected to the collector of the transistor Q1 and the positive electrode of the diode D1, one end of the resistor R2 is connected to the positive electrode of the battery, the other end of the resistor R2 is connected to the collector of the transistor Q2 and the positive electrode of the diode D2, the positive electrode of the diode D3 is connected to the negative electrode of the LED1, the negative electrode of the diode D3 is connected to the base of the transistor Q1, the positive electrode of the diode D4 is connected to the negative electrode of the LED2, and the negative electrode of the diode D4 is connected to the base of the transistor Q2.
Citation Information
Patent Citations
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