CN217088216U - N-1 short circuit protection module of LED with net structure - Google Patents
N-1 short circuit protection module of LED with net structure Download PDFInfo
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- CN217088216U CN217088216U CN202220761628.3U CN202220761628U CN217088216U CN 217088216 U CN217088216 U CN 217088216U CN 202220761628 U CN202220761628 U CN 202220761628U CN 217088216 U CN217088216 U CN 217088216U
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Abstract
The utility model discloses a N-1 short circuit protection module of a net-shaped LED, which comprises a power input module, a net-shaped LED module, a driving module, a switch triode Q1 and an N-1 protection circuit module; the power input module supplies power to the LED module with the net structure and the N-1 protection circuit module respectively; the collector of the switching triode Q1 is connected with the LED module with the net structure, and the emitter of the switching triode Q1 is connected with the output end of the driving module; the inverting input end of the N-1 protection circuit module is connected with the collector of a switching triode Q1, and the operational amplifier output end of the N-1 protection circuit module is connected with the base of a switching triode Q1. The utility model provides a N-1 short-circuit protection module of network structure LED when a certain LED takes place the short-circuit fault, can close other LED's control circuit, satisfies the safety requirement.
Description
Technical Field
The utility model relates to a net structure LED's N-1 short-circuit protection module belongs to the automotive electronics circuit design.
Background
At present, with the popularization of the application of the LED in the automobile lamp, a circuit for realizing N-1 aiming at LED particles and simultaneously realizing constant current is very common. The LED is used as the light source, so that the energy is saved, the environment is protected, the service life of the lamp is prolonged, the cost is reduced, and the brightness of the LED is much higher than that of a halogen lamp, so that the LED is selected to be used as the light source for many automobile tail lamps.
An LED is a semiconductor device that converts electrical energy directly into optical energy. In practical use, a plurality of LEDs are generally connected in series or in parallel to meet the requirements for brightness and lighting effect. In automotive lamps, the lamp must meet the corresponding safety guidelines and regulatory requirements. In a vehicle lamp, a single LED generally cannot meet requirements such as regulations, and a plurality of LEDs are often used to meet the requirements. However, for using LEDs as a vehicle light source, the N-1 criterion must be taken into account at the time of design. The N-1 criterion is further divided into optical and electronic N-1:
optical N-1 criterion: if one LED fails, such as short circuit or open circuit, the rest LEDs still need to meet the minimum luminous flux specified by the lighting criterion of the vehicle lamp;
electron N-1 criteria: if one LED fails, such as a short circuit or open circuit, the remaining LEDs must all be turned off.
In the existing LED car lamp technology, when a car lamp has an LED fault, the existing circuit cannot process the fault condition in time, so that a car body controller cannot detect fault information.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that, overcome prior art not enough, the utility model provides a network structure LED's N-1 short-circuit protection module when a certain LED takes place the short-circuit fault, can close other LED's control circuit, satisfies the safety requirement.
In order to solve the technical problem, the technical scheme of the utility model is that:
an N-1 short circuit protection module of a net-shaped structure LED comprises a power input module, a net-shaped structure LED module, a driving module, a switching triode Q1 and an N-1 protection circuit module;
the power input module supplies power to the LED module with the net structure and the N-1 protection circuit module respectively;
the collector of the switching triode Q1 is connected with the LED module with the net structure, and the emitter of the switching triode Q1 is connected with the output end of the driving module;
the inverting input end of the N-1 protection circuit module is connected with the collector of a switching triode Q1, and the operational amplifier output end of the N-1 protection circuit module is connected with the base of a switching triode Q1.
Furthermore, the net-shaped structure LED module comprises a plurality of LED lamps which are sequentially connected in parallel to form a net-shaped structure, and two ends of each LED lamp are connected in parallel with a protection capacitor.
Further, the N-1 protection circuit module comprises an operational amplifier chip U1, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5 and a capacitor C1, one end of the resistor R1 is connected with a power supply, the other end of the resistor R1 is connected with one end of the resistor R2, the other end of the resistor R2 is grounded, the non-inverting input end of the operational amplifier chip U1 is connected between the resistor R1 and the resistor R2, the non-inverting input end of the operational amplifier chip U1 is connected with the operational amplifier output end of the operational amplifier chip U1 through a resistor R4, the inverting input end of the operational amplifier chip U1 is connected with the operational amplifier output end of the operational amplifier chip U1 through a resistor R5, one end of the capacitor C1 is connected with the inverting input end of the operational amplifier chip U1, the other end of the capacitor C1 is grounded, the operational amplifier output end of the operational amplifier chip U1 is connected with the base electrode of the switch triode Q1, and the inverting input end of the operational amplifier chip U1 is connected with the collector electrode of the switch triode Q1 through a resistor R3.
According to the technical scheme, the utility model discloses can realize that network structure LED normally during operation, arbitrary LED takes place short-circuit fault, can both realize turning off to other LED, makes LED all extinguish, and the automobile body control system that is convenient for after LED all extinguishes detects fault information, in time feeds back to the driver, improves the security of driving a vehicle. The utility model discloses use the component to be discrete component, with low costs, the reliability is high, is not restricted to certain special chip or component, and the substitutability is strong.
Drawings
Fig. 1 is a schematic block diagram of an N-1 short-circuit protection module of a mesh-structured LED according to the present invention;
fig. 2 is a schematic circuit diagram of the mesh-structured LED module of the present invention;
FIG. 3 is a schematic circuit diagram of the N-1 protection circuit module of the present invention;
fig. 4 is a schematic circuit diagram of the driving module of the present invention.
Detailed Description
In order that the present invention may be more readily and clearly understood, the following detailed description of the present invention is provided in connection with the accompanying drawings.
As shown in fig. 1 to 4, the present embodiment provides an N-1 short-circuit protection module of a mesh-structured LED, which includes a power input module, a mesh-structured LED module, a driving module, a switching transistor Q1, and an N-1 protection circuit module.
Specifically, the power input module supplies power to the LED module with the mesh structure and the N-1 protection circuit module respectively, and the power input module can adopt a circuit formed by a DCDC conversion chip and is used by the LED module with the mesh structure.
The collector of the switching triode Q1 is connected with the LED module with the net structure, and the emitter of the switching triode Q1 is connected with the output end of the driving module; the inverting input end of the N-1 protection circuit module is connected with the collector of the switching triode Q1, and the operational amplifier output end of the N-1 protection circuit module is connected with the base of the switching triode Q1.
When the power input module is started, the switching triode Q1 is conducted, so that the whole circuit is closed, and after the circuit is closed, the driving module sets the current for normal work of the LED, so that the LED module with the net structure works normally.
As shown in fig. 2, the LED module with a mesh structure includes a plurality of LED lamps sequentially connected in parallel to form a mesh structure, and a protection capacitor is connected in parallel to two ends of each LED lamp. In the present embodiment, 12 LED lamps PL1 to PL12 are adopted, and 12 protection capacitors PC1 to PC12 are respectively connected in parallel to each LED lamp.
As shown in fig. 3, the N-1 protection circuit module includes an operational amplifier chip U1, a resistor R1, a resistor R2, the circuit comprises a resistor R3, a resistor R4, a resistor R5 and a capacitor C1, wherein one end of the resistor R1 is connected with a power supply, the other end of the resistor R1 is connected with one end of the resistor R2, the other end of the resistor R2 is grounded, the non-inverting input end of an operational amplifier chip U1 is connected between the resistor R1 and the resistor R2, the non-inverting input end of an operational amplifier chip U1 is connected with the operational amplifier output end of the operational amplifier chip U1 through a resistor R4, the inverting input end of the operational amplifier chip U1 is connected with the operational amplifier output end of the operational amplifier chip U1 through a resistor R5, one end of the capacitor C1 is connected with the inverting input end of the operational amplifier chip U1, the other end of the capacitor C1 is grounded, the operational amplifier output end of the operational amplifier chip U1 is connected with the base of a triode Q1, and the inverting input end of the operational amplifier chip U1 is connected with the collector of a triode Q1 through a resistor R3.
In this embodiment, as shown in fig. 4, the driving module in the loop is used to control the current of the LED lamp in the LED module with the mesh structure.
In this implementation, when the power input is turned on, the voltage of the non-inverting input terminal of the operational amplifier chip U1 is higher than that of the inverting input terminal, the operational amplifier outputs a high level, the switching transistor Q1 is turned on, and the branch circuit connected with the switching transistor Q1 and the driving module is turned on, so that the LED lamp can work normally.
When a short-circuit fault occurs to a certain LED lamp:
all the LED lamps in the whole LED module with the net structure and connected with the short-circuit LED lamp in parallel are short-circuited and cannot work normally;
at this moment, the voltage at the connection part of the LED module with the net structure and the switching triode Q1 is increased, so that the voltage at the inverting input end of the operational amplifier chip U1 is higher than the voltage at the non-inverting input end, the operational amplifier chip U1 outputs low level, the base electrode of the switching triode Q1 is closed, and the branch circuit of the driving module connected with the LED module with the net structure is disconnected, so that all LED lamps are turned off.
The above-mentioned embodiments further explain in detail the technical problems, technical solutions and advantages solved by the present invention, and it should be understood that the above only is a specific embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (3)
1. The utility model provides a N-1 short circuit protection module of network structure LED which characterized in that: the LED drive circuit comprises a power input module, a net-shaped LED module, a drive module, a switching triode Q1 and an N-1 protection circuit module;
the power input module supplies power to the LED module with the net structure and the N-1 protection circuit module respectively;
the collector of the switching triode Q1 is connected with the LED module with the net structure, and the emitter of the switching triode Q1 is connected with the output end of the driving module;
the inverting input end of the N-1 protection circuit module is connected with the collector of a switching triode Q1, and the operational amplifier output end of the N-1 protection circuit module is connected with the base of a switching triode Q1.
2. The N-1 short protection module of a mesh-structured LED according to claim 1, wherein: the LED module with the net structure comprises a plurality of LED lamps which are sequentially connected in parallel to form the net structure, and two ends of each LED lamp are connected in parallel with a protective capacitor.
3. The N-1 short protection module of a mesh-structured LED according to claim 1, wherein: the N-1 protection circuit module comprises an operational amplifier chip U1, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5 and a capacitor C1, one end of the resistor R1 is connected with a power supply, the other end of the resistor R1 is connected with one end of the resistor R2, the other end of the resistor R2 is grounded, the non-inverting input end of the operational amplifier chip U1 is connected between the resistor R1 and the resistor R2, the non-inverting input end of the operational amplifier chip U1 is connected with the operational amplifier output end of the operational amplifier chip U1 through a resistor R4, the inverting input end of the operational amplifier chip U1 is connected with the operational amplifier output end of the operational amplifier chip U1 through a resistor R5, one end of the capacitor C1 is connected with the inverting input end of the operational amplifier chip U1, the other end of the capacitor C1 is grounded, the operational amplifier output end of the operational amplifier chip U1 is connected with the base electrode of the switch triode Q1, and the inverting input end of the operational amplifier chip U1 is connected with the collector electrode of the switch triode Q1 through a resistor R3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220761628.3U CN217088216U (en) | 2022-04-02 | 2022-04-02 | N-1 short circuit protection module of LED with net structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220761628.3U CN217088216U (en) | 2022-04-02 | 2022-04-02 | N-1 short circuit protection module of LED with net structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217088216U true CN217088216U (en) | 2022-07-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220761628.3U Active CN217088216U (en) | 2022-04-02 | 2022-04-02 | N-1 short circuit protection module of LED with net structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217088216U (en) |
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2022
- 2022-04-02 CN CN202220761628.3U patent/CN217088216U/en active Active
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