CN205378269U

CN205378269U - LED head -light of can adjusting luminance based on constant current control

Info

Publication number: CN205378269U
Application number: CN201620006473.7U
Authority: CN
Inventors: 孙辉
Original assignee: JIANGSU LANCE VEHICLE TECHNOLOGY Co Ltd
Current assignee: JIANGSU LANCE VEHICLE TECHNOLOGY Co Ltd
Priority date: 2016-01-04
Filing date: 2016-01-04
Publication date: 2016-07-06
Anticipated expiration: 2026-01-04

Abstract

The utility model discloses a LED head -light of can adjusting luminance based on constant current control belongs to automotive filed, including power supply circuit, sampling resistor, chopper circuit, power tube control circuit, LED lamp circuit, dimmer circuit, resistance R8 and constant current source chip, the utility model discloses a constant current source 's LED scheme substitutes traditional halogen bulb, adopts the design of far and near light integral type to the switching of far and near light is realized through adjusting luminance.

Description

A kind of Dimmable LED headlamp based on current constant control

Technical field

This utility model belongs to automotive field.

Background technology

Traditional car headlamp is generally adopted halogen lamp, halogen lamp energy consumption is higher, only has 10% and change into luminous energy in use procedure, and other are partially converted into heat energy dissipation, filament easily fuses under long-time high temperature, fault rate is higher, and anti-seismic performance is poor, and light efficiency is low, colour temperature is relatively single, heat radiation is relatively big, and decay is very fast, has bigger restriction on using.

Summary of the invention

The purpose of this utility model is to provide a kind of Dimmable LED headlamp based on current constant control, adopts the LED scheme that constant-current source drives to substitute traditional halogen lamp, adopts distance-light unitary design, and realized the switching of distance-light by light adjusting circuit.

For achieving the above object, this use is novel by the following technical solutions: a kind of Dimmable LED headlamp based on current constant control, including power supply circuit, sample resistance, chopper circuit, power tube control circuit, LED lamp circuit, light adjusting circuit, resistance R8 and constant-current source chip, constant-current source chip includes IPK pin, VCC pin, COMP pin, GND pin, TCAP pin, SWE pin and SWC pin；

Power supply circuit includes ORL power input, diode D3, resistance R7, diode D1, electric capacity C1 and electric capacity C6, ORL power input connects described VCC pin by diode D1, ORL power input connects described COMP pin also by resistance R8, the negative pole of the cathode connecting diode D3 of diode D1, the positive pole of diode D3 connects ground wire, resistance R7 and diode D3 are connected in parallel, and the negative pole of diode D1 electric capacity C1 together in parallel and electric capacity C6 connects ground wire；

Sample resistance includes resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance R6 and resistance R9, resistance R1, resistance R2, resistance R3, resistance R4, resistance R5 and resistance R6 are connected in series with resistance R9 after being connected in parallel again, the negative pole of diode D1 connects described IPK pin by sample resistance, and described IPK pin connects described SWC pin by resistance R9；

Chopper circuit includes inductance L1, diode D2, electric capacity C5, diode D5, electric capacity C2, resistance R4, electric capacity C3 and electric capacity C4, described SWC pin connects the positive pole of diode D2 by inductance L1, the negative pole of diode D2 connects the positive input terminal of LED lamp circuit, the positive pole of diode D2 connects ground wire also by the electric capacity C2 being cascaded and resistance R14, the negative pole of diode D2 electric capacity C3 together in parallel and electric capacity C4 connects ground wire, the negative pole of diode D2 is also connected with the negative pole of diode D5, the positive pole of diode D5 connects described COMP pin, electric capacity C5 and diode D5 is connected in parallel；

nullPower tube control circuit includes resistance R10、Resistance R11、Resistance R12、Resistance R13、Diode D10、Diode D4、Audion Q1、Power tube TV1 and electric capacity C7，Described SWE pin is by the base stage of the resistance R11 being cascaded and resistance R13 connecting triode Q1，The base stage of audion Q1 connects ground wire by the resistance R13 being cascaded and resistance R12，The colelctor electrode of audion Q1 connects ground wire，The transmitter of audion Q1 connects the grid of power tube TV1，Described SWE pin connects the positive pole of diode D10 by resistance R11，Electric capacity C8 and resistance R11 is connected in parallel，Described TCAP pin connects the positive pole of diode D10 by resistance R10，The negative pole of diode D10 connects the grid of power tube TV1，Described TCAP pin connects ground wire by electric capacity C7，The grid of power tube TV1 connects the negative pole of diode D4，The positive pole of diode D4 connects ground wire，The drain electrode of power tube TV1 connects the positive pole of diode D2，The source electrode of power tube TV1 connects ground wire；

nullLight adjusting circuit includes PL power input、Diode D6、Resistance R18、Diode D7、Diode D8、Resistance R19、Electric capacity C10、Diode D9、Resistance R20、Electric capacity C11、Audion Q2、Resistance R21、Power tube TV2、Resistance R22、Resistance R16、Resistance R17、Resistance R23 and resistance R15，PL power input connects the positive pole of diode D7，The negative pole of diode D7 connects described COMP pin by resistance R8，PL power input connects the negative pole of diode D6，The positive pole of diode D6 connects ground wire，Resistance R18 and diode D6 is connected in parallel，PL power input connects the positive pole of diode D8，The negative pole of the diode D8 base stage by resistance R19 connecting triode Q2，The base stage of audion Q2 connects ground wire by electric capacity C10，The emitter stage of audion Q2 connects ground wire，Resistance R21 is connected in parallel between transmitter and the colelctor electrode of audion Q2，The colelctor electrode of audion Q2 is connected with the grid of power tube TV2，ORL power input is connected with the positive pole of diode D9，The negative pole of diode D9 connects the grid of power tube TV2 by resistance R20，The grid of power tube TV2 connects ground wire by electric capacity C11，The drain electrode of power tube TV2 resistance R22 together in parallel and resistance R23 connects ground wire，The drain electrode of power tube TV2 connects the negative input end of LED lamp circuit also by resistance R16 and the R17 being connected in parallel，The source electrode of power tube TV2 connects ground wire；The positive pole of described diode D5 connects the negative input end of LED lamp circuit by described resistance R15.

Described constant-current source chip is NCP3065.

Described ORL power input range of voltage values is 3V to 40V.

Described PL power input range of voltage values is 3V to 40V.

Described LED circuit includes light emitting diode L2, light emitting diode L3 and light emitting diode L4, and light emitting diode L2, light emitting diode L3 and light emitting diode L4 are for being connected in series.

A kind of Dimmable LED headlamp based on current constant control described in the utility model, adopts LED scheme to substitute traditional halogen lamp, consumes relatively low, and caloric value is less, has better anti-seismic performance, has more colour temperature section to select, and service life is longer.And adopt distance-light unitary design, by dimming the switching realizing distance-light, make use of the energy of automobile batteries efficiently, extend the life-span of illuminator, and achieve environment friendly and pollution-free design, adopt the technical scheme that constant-current source drives, no matter how automobile storage battery voltage suddenlys change, LED can with constant current work, automobile lamp is made to remain in that stable brightness when low-voltage driving, improve reliability and the safety of automobile, distance-light unitary design is structurally greatly saved space, and lower in cost.

Accompanying drawing explanation

Fig. 1 is schematic diagram of the present utility model；

Detailed description of the invention

A kind of Dimmable LED headlamp based on current constant control as shown in Figure 1, including power supply circuit, sample resistance, chopper circuit, power tube control circuit, LED lamp circuit, light adjusting circuit, resistance R8 and constant-current source chip, constant-current source chip includes IPK pin, VCC pin, COMP pin, GND pin, TCAP pin, SWE pin and SWC pin；

Described constant-current source chip is NCP3065.

Described ORL power input range of voltage values is 3V to 40V.

Described PL power input range of voltage values is 3V to 40V.

Operationally, running voltage is loaded in the LED constant current source drive circuit being made up of NPC3065 and related elements by described ORL power input, ORL power input is filtered by filter capacitor C1 and filter capacitor C6, ensure the stability of running voltage, NPC3065 will take in current sampling by described sample resistance, automatically the unidirectional current of input is become another kind of fixedly adjustable constant-current source again through chopper circuit, it is loaded on load LED, then switches distance light and the dipped beam of automobile lamp again through light adjusting circuit.

Sample resistance can adopt the resistor coupled in parallel of 61 ohm to obtain, economical and practical, if the electric current flowing through sample resistance exceedes peak point current, or the voltage at sample resistance two ends more than 0.2V, NPC3065 with regard to automatic cut-off, play the effect of protection circuit.

When PL power input is not loaded with voltage, power tube TV2 turns on, and LED resistance R16 together in parallel and resistance R17 connects ground wire, and now car light is distance light；When PL power input on-load voltage, audion Q2 turns on, and the grid voltage making power tube TV2 is zero, and power tube TV2 ends, and LED connects ground wire by resistance R16, resistance R17, resistance R22 and resistance R23, and now car light is dipped beam.

Claims

1. the Dimmable LED headlamp based on current constant control, it is characterized in that: include power supply circuit, sample resistance, chopper circuit, power tube control circuit, LED lamp circuit, light adjusting circuit, resistance R8 and constant-current source chip, constant-current source chip includes IPK pin, VCC pin, COMP pin, GND pin, TCAP pin, SWE pin and SWC pin；

2. a kind of Dimmable LED headlamp based on current constant control as claimed in claim 1, it is characterised in that: described constant-current source chip is NCP3065.

3. a kind of Dimmable LED headlamp based on current constant control as claimed in claim 1, it is characterised in that: described ORL power input range of voltage values is 3V to 40V.

4. a kind of Dimmable LED headlamp based on current constant control as claimed in claim 1, it is characterised in that: described PL power input range of voltage values is 3V to 40V.

5. a kind of Dimmable LED headlamp based on current constant control as claimed in claim 1, it is characterized in that: described LED circuit includes light emitting diode L2, light emitting diode L3 and light emitting diode L4, and light emitting diode L2, light emitting diode L3 and light emitting diode L4 are for being connected in series.