CN210629928U

CN210629928U - Car light fault protection LED module

Info

Publication number: CN210629928U
Application number: CN201921606319.3U
Authority: CN
Inventors: 黃健维
Original assignee: Laster Automotive Technology Shanghai Co ltd
Current assignee: Laster Automotive Technology Shanghai Co ltd
Priority date: 2019-09-25
Filing date: 2019-09-25
Publication date: 2020-05-26
Anticipated expiration: 2029-09-25

Abstract

The utility model relates to a car light fault protection LED module, including the power, the LED light source of a N series connection, its characterized in that: all the N LED light sources connected in series are connected with the positive end by the open-circuit signal detection circuit, all the N LED light sources connected in series are connected with the negative end by the current-sharing component, the open-circuit signal detection circuit is connected with the positive electrode of the power output end, the current-sharing component is connected with the negative electrode of the power output end, and the current-sharing component is connected with the positive electrode of the power output end by the starting circuit. The utility model has the advantages that: the cost of the controller is reduced, the driving car light fault is reminded, and repair is carried out immediately so as to guarantee the safety during driving.

Description

Car light fault protection LED module

Technical Field

The utility model relates to a car light field especially relates to a car light fault protection LED module.

Background

The LED is a novel efficient and environment-friendly semiconductor light source and has incomparable advantages compared with other light sources. The LEDs can be combined into an LED array in different modes such as series connection, parallel connection and the like so as to meet the requirement of the illumination intensity of the automobile. The car light that uses the LED light source to using LED's light source module in the multiunit series connection, single LED's the inefficacy of opening a way, will reach one-fail-all-fail's function, need use multichannel control IC, integrate all circuits inside the IC, because IC self heat-sinking capability is limited, the electric current that every passageway can flow through receives the restriction to and for reduce cost, can reach this function through the simple and easy circuit via utility model.

Disclosure of Invention

The utility model aims at solving the control IC who needs to use the multichannel among the prior art, integrate all circuits inside the IC, because IC self heat-sinking capability is limited, the electric current that every passageway can flow through receives the problem that the restriction exists, provides a car light fault protection LED module. In order to achieve the above object, the utility model relates to a car light fault protection LED module, including the power, the LED light source of a N series connection, its characterized in that: all the N LED light sources connected in series are connected with the positive end by the open-circuit signal detection circuit, all the N LED light sources connected in series are connected with the negative end by the current-sharing component, the open-circuit signal detection circuit is connected with the positive electrode of the power output end, the current-sharing component is connected with the negative electrode of the power output end, and the current-sharing component is connected with the positive electrode of the power output end by the starting circuit. The open circuit signal detection circuit is composed of a triode, a resistor and a diode, wherein the triode is a PNP triode, the resistor and the diode are connected in series to form a branch, the positive end of the diode is connected with the emitting electrode of the triode, the resistor is connected with the positive end of a resistor and a serially connected LED light source in parallel, and the connected resistor is connected with the base electrode of the triode. The current-sharing component is a triode, the triode is an NPN triode, a collector of the triode is connected with a cathode of a series-connected LED light source, an emitter of the triode is connected with a cathode of a power output end through a resistor, a base of the triode is connected with a starting circuit, the starting circuit is formed by connecting a resistor in series with a capacitor, a positive terminal of the capacitor is connected with a positive electrode of the power output end, a negative terminal of the capacitor is connected with the resistor, and the other terminal of the resistor is connected with a base of the triode.

The utility model has the advantages that make the controller cost reduce, remind driving car light trouble, do the maintenance immediately to security during the guarantee driving.

Drawings

Fig. 1 is a block schematic diagram of the car light fault protection LED module of the present invention;

FIG. 2 is a schematic diagram of components of each block in the car light fault protection LED module of the present invention;

reference numerals:

1. a power supply 2, an open-circuit signal detection 3, an LED light source 4, a current-sharing component 5 and a starting component

6. Resistor 7, diode 8, PNP triode 9, resistor 10, NPN triode 11 and capacitor

12. Resistor 13, light emitting diode.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

The utility model discloses a car light fault protection LED module (one-fail-all-fail), its implementation mode, like the car light fault protection LED module shown in figure 2, the power (1) is the power supply providing the light source module, here using constant current source as an example; the open-circuit signal detection (2) consists of a PNP triode (7), a diode (8) and a resistor (9) and has the functions of detecting an open-circuit signal and cutting off the current of the LED light source; the N strings of LED light sources (3) are composed of LEDs (13) and provide light source output for the car lamp; the current equalizing component (4) is composed of NPN triodes (10) to form a current mirror to maintain the current equalization among the plurality of groups of series circuits. Under normal operation, the power is turned on in a transient state, the starting component (5) utilizes the transient characteristic of the capacitor (11) to open the NPN triode (10) of the current-sharing component (4) in advance, so that each string of LED light sources (3) is conducted, the open-circuit signal of each string is detected (2), the PNP triode (7) is conducted, the conduction of the NPN triode (10) of the current-sharing component (4) can be maintained, and the starting program is completed. At the moment, the starting component (5) forms an open circuit, the LED light sources of each string can be equalized, the overall circuit voltage drop can be maintained at the lowest voltage drop, and the power loss is reduced. When the open circuit failure occurs, and a single LED in a certain string of LED light sources fails to open, no current flows, so that the PNP triode (7) of the open circuit signal detection (2) is turned off, the NPN triode (10) of the current sharing component (4) is turned off, and the whole light source module is turned off immediately, thereby completing the function of one-fail-all-fail.

Claims

1. The utility model provides a car light fault protection LED module, includes the power, the LED light source of N series connection, its characterized in that: all the N LED light sources connected in series are connected with the positive end by the open-circuit signal detection circuit, all the N LED light sources connected in series are connected with the negative end by the current-sharing component, the open-circuit signal detection circuit is connected with the positive electrode of the power output end, the current-sharing component is connected with the negative electrode of the power output end, and the current-sharing component is connected with the positive electrode of the power output end by the starting circuit.

2. The vehicle lamp fault protection LED module according to claim 1, wherein: the open circuit signal detection circuit is composed of a triode, a resistor and a diode, wherein the triode is a PNP triode, the resistor and the diode are connected in series to form a branch, the positive end of the diode is connected with the emitting electrode of the triode, the resistor is connected with the positive end of a resistor and a serially connected LED light source in parallel, and the connected resistor is connected with the base electrode of the triode.

3. The vehicle lamp fault protection LED module according to claim 1, wherein: the current-sharing component is a triode, the triode is an NPN triode, a collector of the triode is connected with a cathode of a series-connected LED light source, an emitter of the triode is connected with a cathode of a power output end through a resistor, a base of the triode is connected with a starting circuit, the starting circuit is formed by connecting a resistor in series with a capacitor, a positive terminal of the capacitor is connected with a positive electrode of the power output end, a negative terminal of the capacitor is connected with the resistor, and the other terminal of the resistor is connected with a base of the triode.