CN211090039U - Shared control circuit for automobile L ED daytime running light and clearance indicating light - Google Patents
Shared control circuit for automobile L ED daytime running light and clearance indicating light Download PDFInfo
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- CN211090039U CN211090039U CN201920809724.9U CN201920809724U CN211090039U CN 211090039 U CN211090039 U CN 211090039U CN 201920809724 U CN201920809724 U CN 201920809724U CN 211090039 U CN211090039 U CN 211090039U
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Abstract
The utility model discloses a car L ED day portable lighter and clearance lamp shared control circuit, it includes L ED banks, headlight control signal sampling unit, switch circuit and constant current control unit, constant current control unit includes L ED constant current drive chip and current sampling circuit, L ED banks is connected with switch circuit through current sampling circuit, constant current control unit can be according to headlight control signal sampling unit's control signal control switch circuit, thereby change the resistance value size of current sampling circuit and carry out the output current regulation, realize the luminance regulation of L ED banks, its advantage lies in utilizing a L ED banks to have carried out the dual function of clearance lamp and day portable lighter, carried out the purpose of day portable lighter and sharing a control circuit of clearance lamp, its circuit structure design is simple, the debugging is simple and convenient, the cost is reduced and the constant current effect is very good.
Description
Technical Field
The invention relates to an automobile control circuit, in particular to a control circuit shared by an automobile L ED daytime running light and a clearance lamp, and belongs to the technical field of automobile illumination.
Background
Automobile daytime running light and outline marker lamp adopt L ED lamp module more in the existing market, not only energy-conservation, and improve the safety of automobile driving to a certain extent, however, current L ED daytime running light and outline marker lamp respectively have own control circuit, although can realize L ED daytime running light and outline marker lamp control, control circuit is whole complicated, the debugging is difficult, and L ED lamp module constant current circuit is very simple, thereby the very poor problem of constant current effect has been led to.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a control circuit shared by L ED daytime running lamps and clearance lamps, which can automatically switch the supply current of L ED lamp modules, thereby realizing the functions of daytime running lamps and clearance lamps, has good constant current supply effect of L ED modules, and has simple debugging of the control circuit.
In order to solve the technical problems, the control circuit shared by the automobile L ED daytime running light and the clearance lamp comprises a L ED light group, a headlamp control signal sampling unit, a switch circuit connected with a headlamp control signal detection unit and a constant current control unit with a constant current adjusting function connected with a L ED light group, wherein the constant current control unit comprises a L ED constant current driving chip and a current sampling circuit connected with a L ED constant current driving chip, the L ED light group is connected with the switch circuit through the current sampling circuit, and the constant current control unit can control the switch circuit according to a control signal of the headlamp control signal sampling unit, so that the resistance value of the current sampling circuit is changed to adjust the output current, and the brightness adjustment of the L ED light group is realized.
The constant current control unit is connected with a power supply.
The current sampling circuit is composed of a sampling resistor R4Current sampling regulating resistor R connected in series with switching circuit3Are connected in parallel.
The input end of the L ED constant current driving chip passes through C9、L2、C10Forming a pi-type filter network.
D is arranged between the output end of the L ED constant current driving chip and the grounding end8、C3、R5The stable circuit of L ED constant current drive chip is formed, L is arranged between the output end of L ED constant current drive chip and the grounding end4、C12、C11A filter circuit is formed.
The switch circuit is a field effect transistor.
The control end grid of the field effect transistor is connected with the headlight control signal detection unit, the source electrode of the field effect transistor is connected with the grounding end, and the drain electrode of the field effect transistor is connected with the current sampling adjusting resistor R3And (4) connecting.
R of the front end of the switching circuit1And R2A bias circuit constituting a field effect transistor, said switching circuit front end C1Forming a field effect transistor input filter circuit.
The invention has the advantages that through the circuit structure design, the control circuit judges whether the day is at night or daytime according to the headlight signal, controls L ED lamp group brightness by adjusting the output current, adjusts L ED lamp group brightness to the outline marker lamp brightness at night, and adjusts L ED lamp group brightness to the daytime running lamp brightness in the daytime, so that the L ED lamp group is utilized to realize the dual functions of the outline marker lamp and the daytime running lamp, the aim of sharing one control circuit by the daytime running lamp and the outline marker lamp is fulfilled, the circuit structure design is simple, the debugging is simple and convenient, the cost is reduced, and the constant current effect is very good.
Drawings
FIG. 1 is a schematic block diagram of an automobile L ED daytime running light and clearance light control circuit of the present invention;
fig. 2 is a circuit diagram of an automobile L ED daytime running light and a profile light control circuit according to the present invention.
Detailed Description
The following describes an automobile L ED daytime running light and a profile control circuit according to the present invention in further detail with reference to the accompanying drawings and the detailed description.
As shown in fig. 1 and 2, the L ED daytime running light and clearance lamp control circuit for an automobile of the invention includes a L ED light group, a headlight control signal sampling unit, a switch circuit connected to the headlight control signal detection unit, and a constant current control unit with a constant current regulation function connected to the L ED light group, wherein an input end of the constant current control unit is connected to a power supply, the switch circuit is preferably a field effect transistor to avoid high-temperature interference, the constant current control unit includes a L ED constant current driving chip and a current sampling circuit connected to the L ED constant current driving chip, a L ED constant current chip is specifically X L3001, the L ED light group is connected to the switch circuit through the current sampling circuit, a control signal of the headlight control signal detection unit controls the switch circuit, and the constant current control unit can control the switch circuit according to the control signal of the headlight control signal sampling unit, so as to change a resistance value of the current sampling circuit to implement output current regulation, and realize brightness regulation of the L ED light group.
For the circuit structure, as can be seen from fig. 2, the input terminal of the L ED constant current driving chip is connected through C9、L2、C10C at the input end for forming a pi-type filter network to filter out clutter signals of the input signal10Filtering low-frequency interference signals, wherein D is the distance between the output end of the L ED constant current driving chip and the grounding end8、C3、R5The stable circuit required by L ED constant current driving chip is formed, and L is arranged between the output end and the grounding end of L ED constant current driving chip4、C12、C11Forming a filter circuit to ensure output current purity, field effect transistor Q1The control end grid is connected with the headlight control signal detection unit, and the field effect tube Q1Is connected with the grounding end, and a field effect tube Q1Drain and current sampling regulation resistor R3The switch circuit is connected in parallel with the current sampling circuit, specifically the current sampling circuit is composed of a sampling resistor R4Current sampling regulating resistor R connected in series with switching circuit3Formed in parallel, so that the resistors R are adjusted in series by field-effect transistors3Is connected in parallel to the current sampling resistor R4Both ends, can change sampling resistor's resistance, sampling resistor's current signal feeds back L ED constant current driver chip, realize L ED constant current driver chip's output current and adjust, when headlight control signal is low, L ED driver chip exports the low current, L ED banks is for showing the clearance lamp this moment, when headlight signal is high, L ED driver chip exports the high current, L ED banks is the daytime running light this moment, in addition, the R of switch circuit front end1And R2Bias circuit constituting field effect transistor, switching circuit front end C1Forming a field effect transistor input filter circuit.
The principle is as follows:
field effect transistor Q1On-off control according to headlight control signal, thereby controllingCurrent sampling adjusting resistor R3Whether or not to sample the resistor R with the current4The resistance values of the current sampling resistors are changed in parallel connection, then the L ED constant current driving chip realizes the current output to the L ED lamp group according to the feedback resistance values of the sampling resistors, so that adjustment is carried out, when the headlamp control signal is low voltage, the L ED constant current output is low current, the L ED lamp group is a profile indicating lamp, when the headlamp control signal is high voltage, the L ED constant current output is low current, the shared L ED lamp group is used as an automobile L ED daytime running lamp group.
Claims (8)
1. A control circuit shared by an automobile L ED daytime running lamp and a clearance lamp is characterized by comprising a L ED lamp group, a headlamp control signal sampling unit, a switching circuit connected with a headlamp control signal detection unit and a constant current control unit connected with a L ED lamp group and having a constant current adjusting function, wherein the constant current control unit comprises a L ED constant current driving chip and a current sampling circuit connected with a L ED constant current driving chip, the L ED lamp group is connected with the switching circuit through the current sampling circuit, and the constant current control unit can control the switching circuit according to a control signal of the headlamp control signal sampling unit, so that the resistance value of the current sampling circuit is changed to adjust the output current, and the brightness adjustment of the L ED lamp group is realized.
2. The control circuit for the L ED daytime running light and clearance light of claim 1, wherein the constant current control unit is connected with a power supply.
3. The control circuit for the L ED daytime running light and clearance light of the automobile according to claim 1 or 2, wherein the current sampling circuit is composed of a sampling resistor R4Current sampling regulating resistor R connected in series with switching circuit3Are connected in parallel.
4. The control circuit for L ED daytime running light and clearance light of car as claimed in claim 3, wherein the input terminal of said L ED constant current driving chip is connected via C9、L2、C10Forming a pi-type filter network.
5. The control circuit for the L ED daytime running light and clearance light of the car as claimed in claim 1, 2 or 4, wherein the distance between the output terminal of the L ED constant current driving chip and the ground terminal is D8、C3、R5The stable circuit of L ED constant current drive chip is formed, L is arranged between the output end of L ED constant current drive chip and the grounding end4、C12、C11A filter circuit is formed.
6. The control circuit for both the L ED daytime running light and the clearance light of claim 5, wherein the switch circuit is a FET.
7. The control circuit for the L ED daytime running light and clearance light of claim 6, wherein the control end grid of the FET is connected with the headlight control signal detection unit, the source electrode of the FET is connected with the ground terminal, and the drain electrode of the FET is connected with the current sampling adjustment resistor R3And (4) connecting.
8. The control circuit for L ED daytime running light and clearance light of automobile according to claim 7, wherein R at the front end of the switch circuit1And R2A bias circuit constituting a field effect transistor, said switching circuit front end C1Forming a field effect transistor input filter circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920809724.9U CN211090039U (en) | 2019-05-31 | 2019-05-31 | Shared control circuit for automobile L ED daytime running light and clearance indicating light |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920809724.9U CN211090039U (en) | 2019-05-31 | 2019-05-31 | Shared control circuit for automobile L ED daytime running light and clearance indicating light |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211090039U true CN211090039U (en) | 2020-07-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920809724.9U Active CN211090039U (en) | 2019-05-31 | 2019-05-31 | Shared control circuit for automobile L ED daytime running light and clearance indicating light |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211090039U (en) |
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2019
- 2019-05-31 CN CN201920809724.9U patent/CN211090039U/en active Active
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