CN213991102U - Constant current circuit for multi-path steering lamp - Google Patents
Constant current circuit for multi-path steering lamp Download PDFInfo
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- CN213991102U CN213991102U CN202121531011.4U CN202121531011U CN213991102U CN 213991102 U CN213991102 U CN 213991102U CN 202121531011 U CN202121531011 U CN 202121531011U CN 213991102 U CN213991102 U CN 213991102U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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Abstract
The utility model discloses a multichannel indicator constant current circuit, its characterized in that: the circuit comprises an input filter protection circuit, a fault detection circuit and a triode constant current circuit, wherein the input filter protection circuit comprises a transient pulse suppression diode TVS1, a resistor R1, a capacitor C1 and a diode D1, two ends of the transient pulse suppression diode TVS1, the resistor R1 and the capacitor C1 are respectively connected with a power supply anode and a power supply cathode after being connected in parallel, the anode of the diode D1 is connected with the power supply anode, the cathode of the diode D1 is connected with an LED load anode, and the LED load anode comprises a first group of LED loads and a second group of LED loads; the utility model discloses a second triode Q3 and third triode Q4 constitute constant current voltage stabilizing circuit, constitute the fault detection circuit through first MOS pipe Q1 and second MOS pipe Q2 for reach when one of them LED inefficacy extinguish the back, all LED all extinguish's effect. The circuit has the advantages of simple structure, mature application, low cost and high stability.
Description
Technical Field
The utility model relates to a multichannel indicator constant current circuit belongs to car LED load constant current circuit design field.
Background
In recent years, due to the demands on the design of the external shape of the automobile, the requirements on aerodynamics and the requirement on beauty, the external shape of the low profile streamline is more popular, and the shape of the automobile lamp is also developed towards the heterotyping and integration, so that the application of the LED light source is more extensive.
The LED is a light emitting diode, and the characteristic is that when the voltage at two ends of the LED changes very little, the current changes very much, so as to avoid the burning out of the LED due to the excessive current flowing through the LED, the LED is usually driven by constant current when being lighted.
Due to the regulation requirements, the turn signal lamp has higher safety level, and one LED is usually required to be damaged, and other LEDs are required to be extinguished. Therefore, the conventional LED steering lamp constant current circuit mostly adopts an LED series connection mode, a switch power supply circuit is often used for an LED load in the series connection mode due to high voltage, the conventional LED car lamp constant current circuit mostly adopts a switch power supply circuit, the switch power supply has certain EMI interference and noise although the efficiency is high, and the development and application cost is high for inhibiting the interference and the noise.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is: the current constant current circuit of the LED steering lamp is controlled by adopting a switching power supply circuit, and the problems of circuit interference and large noise are solved.
In order to solve the problem, the technical scheme of the utility model provides a multichannel indicator constant current circuit, its characterized in that is provided: the circuit comprises an input filter protection circuit, a fault detection circuit and a triode constant current circuit, wherein the input filter protection circuit comprises a transient pulse suppression diode TVS1, a resistor R1, a capacitor C1 and a diode D1, two ends of the transient pulse suppression diode TVS1, the resistor R1 and the capacitor C1 are respectively connected with a power supply anode and a power supply cathode after being connected in parallel, the anode of the diode D1 is connected with the power supply anode, the cathode of the diode D1 is connected with an LED load anode, and the LED load anode comprises a first group of LED loads and a second group of LED loads;
the fault detection circuit comprises a first MOS tube Q1 and a second MOS tube Q2, wherein the grid electrode of the first MOS tube Q1 is connected with the negative electrode of the first group of LED loads through a resistor R4, the drain electrode of the first MOS tube Q1 is connected with the positive electrode of the first group of LED loads through a resistor R2, the source electrode of the first MOS tube Q is connected with the negative electrode of a power supply, and a resistor R8 is connected between the grid electrode and the source electrode in parallel;
the grid electrode of the second MOS transistor Q2 is connected with the negative electrode of the second group of LED loads through a resistor R5, the drain electrode of the second MOS transistor Q2 is connected with the positive electrode of the second group of LED loads through a resistor R3, the source electrode of the second MOS transistor Q2 is connected with the negative electrode of the power supply, and a resistor R9 is connected between the grid electrode and the source electrode in parallel;
the drain of the first MOS transistor Q1 is connected to one end of a resistor R6 through a diode D2, and the drain of the second MOS transistor Q2 is connected to one end of a resistor R6 through a diode D3;
the triode constant current circuit comprises a first triode Q5, a second triode Q3 and a third triode Q4, wherein the base electrode of the first triode Q5 is connected with the other end of a resistor R6, the base electrode and an emitting electrode are connected with a capacitor C4 in parallel, the emitting electrode is connected to the negative electrode of a power supply, a voltage stabilizing diode Z1 is connected between a collecting electrode and the emitting electrode in parallel, and the collecting electrode is connected with the anodes of the first group of LED loads and the second group of LED loads through a resistor R7;
the base electrode of the second triode Q3 and the emitter electrode of the second triode Q3 are connected with a capacitor C2 in parallel, the collector electrode of the second triode Q3 is connected with the negative electrode of the first group of LED loads, the base electrode of the second triode Q5 is connected with the collector electrode of the first triode Q3526 through a resistor R10, and the emitter electrode of the second triode Q5 is connected with the negative electrode of the power supply through a resistor R12;
the base electrode of the third triode Q4 and the emitter electrode of the third triode Q4 are connected with a capacitor C3 in parallel, the collector electrode of the third triode Q4 is connected with the negative electrode of the second group of LED loads, the base electrode of the third triode Q3578 is connected with the collector electrode of the first triode Q5 through a resistor R11, and the emitter electrode of the third triode Q4 is connected with the negative electrode of the power supply through a resistor R13.
Preferably, the first MOS transistor Q1 and the second MOS transistor Q2 are N-channel MOS transistors.
Preferably, the first transistor Q5, the second transistor Q3 and the third transistor Q4 are NPN transistors.
Preferably, the first group of LED loads includes the LED1 and the LED2 connected in series, and the second group of LED loads includes the LED3 and the LED4 connected in series.
Preferably, the transient pulse suppression diode TVS1 is a bidirectional diode.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model discloses a second triode Q3 and third triode Q4 constitute constant current voltage stabilizing circuit, through setting up the resistance of resistance R12 and R13, realize the LED load constant current; a fault detection circuit is formed by the first MOS tube Q1 and the second MOS tube Q2 and is used for achieving the effect that when one LED is out of work and extinguished, all LEDs are extinguished. The circuit has the advantages of simple structure, mature application, low cost and high stability, and effectively solves the problems of large ripple noise, difficult EMI interference suppression, high cost and the like of the automobile lamp switching power supply.
Drawings
Fig. 1 is the utility model relates to a multichannel indicator constant current circuit structure chart.
Detailed Description
In order to make the present invention more comprehensible, preferred embodiments are described in detail below with reference to the accompanying drawings.
As shown in FIG. 1, the utility model relates to a multichannel indicator constant current circuit includes input filter protection circuit, fault detection circuit and triode constant current circuit.
The input filter protection circuit comprises a transient pulse suppression diode TVS1, a resistor R1, a capacitor C1 and a diode D1, wherein the transient pulse suppression diode TVS1 is a bidirectional diode, two ends of the transient pulse suppression diode TVS1, the resistor R1 and the capacitor C1 are connected in parallel and then are respectively connected to the positive electrode and the negative electrode of a power supply, the anode of the diode D1 is connected to the positive electrode of the power supply, and the cathode of the diode D1 is connected to the positive electrode of an LED load. The LED loads include a first group of LED loads and a second group of LED loads, the first group of LED loads including LED1 and LED 2. The second group of LED loads includes LED3 and LED 4.
The fault detection circuit comprises a first MOS transistor Q1 and a second MOS transistor Q2, wherein the first MOS transistor Q1 and the second MOS transistor Q2 are N-channel MOS transistors. The grid electrode of the first MOS transistor Q1 is connected to the cathode of the first group of LED loads through a resistor R4, the drain electrode of the first MOS transistor Q1 is connected to the anode of the first group of LED loads through a resistor R2, the source electrode of the first MOS transistor Q1 is connected to the cathode of the power supply, and the resistor R8 is connected between the grid electrode and the source electrode in parallel.
The grid electrode of the second MOS tube Q2 is connected to the cathode of the second group of LED loads through a resistor R5, the drain electrode is connected to the anode of the second group of LED loads through a resistor R3, the source electrode is connected with the cathode of the power supply, and the resistor R9 is connected between the grid electrode and the source electrode in parallel. The drain of the first MOS transistor Q1 is connected to the resistor R6 through a diode D2, and the drain of the second MOS transistor Q2 is connected to the resistor R6 through a diode D3.
The triode constant current circuit comprises a first triode Q5, a second triode Q3, a third triode Q4, a first triode Q5, a second triode Q3 and a third triode Q4 which are NPN type triodes. The base of the first triode Q5 is connected to the diodes D2 and D3 of the fault detection circuit through a resistor R6, the base and emitter are connected in parallel with a capacitor C4, the emitter is connected to the negative pole of the power supply, a zener diode Z1 is connected between the collector and the emitter in parallel, and the collector is connected to the positive pole of the LED load through a resistor R7. The base of the second triode Q3 and the emitter of the second triode Q3 are connected with a capacitor C2 in parallel, the collector of the second triode Q3 is connected with the negative electrode of the first group of LED loads, the base of the second triode Q5 is connected with the collector of the first triode Q3526 through a resistor R10, and the emitter of the second triode Q5 is connected with the negative electrode of the power supply through a resistor R12. The base of the third triode Q4 and the emitter of the third triode Q4 are connected with a capacitor C3 in parallel, the collector of the third triode Q4 is connected with the negative electrode of the second group of LED loads, the base of the third triode Q5 is connected with the collector of the first triode Q3526 through a resistor R11, and the emitter of the third triode Q5 is connected with the negative electrode of the power supply through a resistor R13.
The anode of the power supply flows to the anode VCC of the LED load through the input filter protection circuit, and the VCC passes through the resistor R7 and the zener diode Z1, so that the voltage at two ends of the zener diode Z1 is maintained at Vz1. VCC flows into the second triode Q3 after being limited by the resistor R10, flows into the third triode Q4 after being limited by the resistor R11, and opens the second triode Q3 and the third triode Q4, so that the second triode Q3 and the third triode Q4 work in an amplification state; meanwhile, the main circuit VCC flows to the second triode Q3 through the first group of LED loads, flows to the negative electrode of the power supply through the resistor R12, flows to the third triode Q4 through the second group of LED loads, and flows to the negative electrode of the power supply through the resistor R13.
When the voltage across resistor R12 is equal to the current flowing through the first group of LED loads multiplied by electricityR12, VR12=Iled1R12, and voltage V on resistor R12R12Equal to the voltage V on the zener diode Z1z1Minus the voltage V between the base and emitter of the second transistor Q3be。
The voltage across resistor R13 is equal to the current through the first group of LED loads multiplied by resistor R13, VR13=Iled2R13, and voltage V on resistor R13R13Equal to the voltage V on the zener diode Z1z1Minus the voltage V between the base and emitter of the second transistor Q3be。
From the conduction characteristic of the transistor, Vbe= 0.7V. So that the current I on the first group of LED loadsled1=（Vz1-Vbe) /R12, current I on the second group of LEDsled2=（Vz1-Vbe) and/R13. Therefore, the LED can be made constant current by only adjusting the resistance values of the resistors R12 and R13.
During normal operation, the main circuit VCC flows to the power supply cathode through the second triode Q3 through the cathode of the first group of LED loads, and simultaneously turns on the first MOS transistor Q1 through the resistor R4, at this time, the drain voltage V1=0V of the transistor Q1. The main circuit VCC flows to the negative electrode of the power supply through the second triode Q4 through the negative electrode of the second group of LED loads, and simultaneously turns on the first MOS transistor Q2 through the resistor R4, at which time the drain voltage V2 of Q2 = 0V. At this time, no voltage flows to the diodes D2 and D3, and the first transistor Q5 is not operated.
When one LED is in open circuit fault, for example, the LED1 in the first group of LED loads is damaged and is open, the first group of LED loads are open, no current flows to the R4 and the first MOS transistor Q1, so that the first MOS transistor Q1 does not work and is in an off state. At this time, the voltage of V1 is equal to the voltage of the main power VCC, VCC is limited by the resistor R2 and flows to the diode D3, and flows to the base of the first transistor Q5 through the resistor R6, and the first transistor Q5 is turned on, and the voltage of the collector of the first transistor Q5 is equal to 0V. No current flows through the resistor R10 and the resistor R11, and the second transistor Q3 and the third transistor Q4 are turned off, thereby rendering the entire LED load inoperative.
The common automobile power supply voltage VBAT =12V when the power supply voltage changes. Referring to the ISO16750 standard, automotive lamp related electrical performance tests require that VBAT can still work properly when changing within 9 to 16V. The utility model discloses a constant current circuit can know by LED's characteristic, and under the unchangeable condition of electric current, LED both ends voltage is unchangeable, and when VBAT voltage changed, the voltage difference value that the voltage variation produced was whole to be consumed by second triode Q3 and third triode Q4. When the voltage decreases, the power consumption of the second transistor Q3 and the third transistor Q4 decreases, and when the voltage increases, the power consumption of the second transistor Q3 and the third transistor Q4 increases. Therefore, the second transistor Q3 and the third transistor Q4 are selected according to the design requirements at the beginning of the design, and the failure of the second transistor Q3 and the third transistor Q4 due to the high temperature caused by the increase of the power consumption of the second transistor Q3 and the third transistor Q4 is avoided.
Claims (5)
1. A constant current circuit of a multi-path steering lamp is characterized in that: the circuit comprises an input filter protection circuit, a fault detection circuit and a triode constant current circuit, wherein the input filter protection circuit comprises a transient pulse suppression diode TVS1, a resistor R1, a capacitor C1 and a diode D1, two ends of the transient pulse suppression diode TVS1, the resistor R1 and the capacitor C1 are respectively connected with a power supply anode and a power supply cathode after being connected in parallel, the anode of the diode D1 is connected with the power supply anode, the cathode of the diode D1 is connected with an LED load anode, and the LED load anode comprises a first group of LED loads and a second group of LED loads;
the fault detection circuit comprises a first MOS tube Q1 and a second MOS tube Q2, wherein the grid electrode of the first MOS tube Q1 is connected with the negative electrode of the first group of LED loads through a resistor R4, the drain electrode of the first MOS tube Q1 is connected with the positive electrode of the first group of LED loads through a resistor R2, the source electrode of the first MOS tube Q is connected with the negative electrode of a power supply, and a resistor R8 is connected between the grid electrode and the source electrode in parallel;
the grid electrode of the second MOS transistor Q2 is connected with the negative electrode of the second group of LED loads through a resistor R5, the drain electrode of the second MOS transistor Q2 is connected with the positive electrode of the second group of LED loads through a resistor R3, the source electrode of the second MOS transistor Q2 is connected with the negative electrode of the power supply, and a resistor R9 is connected between the grid electrode and the source electrode in parallel;
the drain of the first MOS transistor Q1 is connected to one end of a resistor R6 through a diode D2, and the drain of the second MOS transistor Q2 is connected to one end of a resistor R6 through a diode D3;
the triode constant current circuit comprises a first triode Q5, a second triode Q3 and a third triode Q4, wherein the base electrode of the first triode Q5 is connected with the other end of a resistor R6, the base electrode and an emitting electrode are connected with a capacitor C4 in parallel, the emitting electrode is connected to the negative electrode of a power supply, a voltage stabilizing diode Z1 is connected between a collecting electrode and the emitting electrode in parallel, and the collecting electrode is connected with the anodes of the first group of LED loads and the second group of LED loads through a resistor R7;
the base electrode of the second triode Q3 and the emitter electrode of the second triode Q3 are connected with a capacitor C2 in parallel, the collector electrode of the second triode Q3 is connected with the negative electrode of the first group of LED loads, the base electrode of the second triode Q5 is connected with the collector electrode of the first triode Q3526 through a resistor R10, and the emitter electrode of the second triode Q5 is connected with the negative electrode of the power supply through a resistor R12;
the base electrode of the third triode Q4 is connected with the emitter electrode of the capacitor C3 in parallel, the collector electrode of the third triode Q4 is connected with the negative electrode of the second group of LED loads, the base electrode of the third triode Q5 is connected with the collector electrode of the first triode Q3684 through a resistor R11, and the emitter electrode of the third triode Q4 is connected with the negative electrode of the power supply through a resistor R13.
2. The multi-way turn signal lamp constant current circuit as claimed in claim 1, wherein: the first MOS transistor Q1 and the second MOS transistor Q2 are N-channel MOS transistors.
3. The multi-way turn signal lamp constant current circuit as claimed in claim 1, wherein: the first triode Q5, the second triode Q3 and the third triode Q4 are NPN type triodes.
4. The multi-way turn signal lamp constant current circuit as claimed in claim 1, wherein: the first group of LED loads includes LEDs 1 and 2 connected in series, and the second group of LED loads includes LEDs 3 and 4 connected in series.
5. The multi-way turn signal lamp constant current circuit as claimed in claim 1, wherein: the transient pulse suppression diode TVS1 is a bidirectional diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121531011.4U CN213991102U (en) | 2021-07-07 | 2021-07-07 | Constant current circuit for multi-path steering lamp |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121531011.4U CN213991102U (en) | 2021-07-07 | 2021-07-07 | Constant current circuit for multi-path steering lamp |
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| CN213991102U true CN213991102U (en) | 2021-08-17 |
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| CN202121531011.4U Active CN213991102U (en) | 2021-07-07 | 2021-07-07 | Constant current circuit for multi-path steering lamp |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114721461A (en) * | 2022-04-27 | 2022-07-08 | 华荣科技股份有限公司 | Constant current source circuit with irradiation-resistant dual protection |
| CN116471723A (en) * | 2023-05-25 | 2023-07-21 | 湖北工业大学 | LED serial fault bypass circuit and method based on constant current control |
-
2021
- 2021-07-07 CN CN202121531011.4U patent/CN213991102U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114721461A (en) * | 2022-04-27 | 2022-07-08 | 华荣科技股份有限公司 | Constant current source circuit with irradiation-resistant dual protection |
| CN116471723A (en) * | 2023-05-25 | 2023-07-21 | 湖北工业大学 | LED serial fault bypass circuit and method based on constant current control |
| CN116471723B (en) * | 2023-05-25 | 2023-09-15 | 湖北工业大学 | LED serial fault bypass circuit and method based on constant current control |
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