CN212013133U - Constant-current driving circuit for lighting multiplexing - Google Patents
Constant-current driving circuit for lighting multiplexing Download PDFInfo
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- CN212013133U CN212013133U CN201922487705.1U CN201922487705U CN212013133U CN 212013133 U CN212013133 U CN 212013133U CN 201922487705 U CN201922487705 U CN 201922487705U CN 212013133 U CN212013133 U CN 212013133U
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Abstract
The invention relates to the field of vehicle illumination, in particular to a constant current driving circuit for illumination multiplexing. The method comprises the following steps: the input end of the position switch is connected with the power input end of the car lamp, and the output end of the position switch is connected with the first node; the input end of the brake switch is connected with the power supply input end of the car lamp, the first output end of the brake switch is connected with a first node through a first diode, the second output end of the brake switch is connected with a second node through a second diode, and the second node is respectively connected with a grid electrode of a first MOS (metal oxide semiconductor) tube and a grid electrode of a second MOS tube; one end of the shunt unit is connected with the third node, the other end of the shunt unit is connected with the drain electrode of the second MOS tube, and the source electrode of the second MOS tube is connected with the fourth node; the drain electrode of the first MOS tube is connected with the fourth node through a first resistor, and the source electrode of the first MOS tube is connected with the output end of the power supply. The beneficial effects of the above technical scheme are: the economic cost is reduced, the vehicle design area is saved, the vehicle design line type is optimized, and the load service efficiency is improved.
Description
Technical Field
The invention relates to the field of vehicle illumination, in particular to a constant current driving circuit for illumination multiplexing.
Background
At present, on passenger vehicles or commercial vehicles, LEDs are more and more popular as vehicle lamp loads, because the LED lamp is more beautiful in shape, more energy-saving and more environment-friendly, and gradually replaces the traditional halogen bulb scheme.
In many vehicle models, the LED loads of the stop and position lights are common. When having arrived at dusk or evening, when opening the car light, if not stepping on the brake, back tail lamp can present the position lamp effect, plays one and shows the width, the effect of warning, and when stepping on the brake, the LED load of "position lamp" can become a lot of, and LED current can increase several times, becomes the brake light, plays one and warns for the back car, informs, notices the effect of keeping good vehicle distance.
At present, two common driving loads with the function of the position lamp of the stop lamp are available on the market: one is to use an integrated form, and the problems that the load is common and different functional currents are different can be directly solved through one chip; the other is to use a plurality of triodes to realize specific functional requirements, but the economic cost of the two technical schemes is higher.
Disclosure of Invention
According to the defects and problems in the prior art, a constant current driving circuit for lighting multiplexing is provided, which is applied to a lamp of an automobile and is characterized by comprising:
the input end of the position switch is connected with the power supply input end of the car lamp, and the output end of the position switch is connected with a first node;
the input end of the brake switch is connected with the power input end of the car lamp, the first output end of the brake switch is connected with the first node through a first diode, the second output end of the brake switch is connected with a second node through a second diode, and the second node is respectively connected with the grid electrode of a first MOS (metal oxide semiconductor) tube and the grid electrode of a second MOS tube;
the first input end of the load constant-current unit is connected with the first node, the second input end of the load constant-current unit is connected with a third node, the third input end of the load constant-current unit is connected with a fourth node, and the output end of the load constant-current unit is connected with the power supply output end of the car lamp;
one end of the shunt unit is connected with the third node, the other end of the shunt unit is connected with the drain electrode of the second MOS tube, and the source electrode of the second MOS tube is connected with the fourth node;
the drain electrode of the first MOS tube is connected with the fourth node through a first resistor, and the source electrode of the first MOS tube is connected with the output end of the power supply.
Preferably, the load constant current unit includes:
the input end of the load unit is connected with the first node;
and a first input end of the constant current unit is connected with the first node through a second resistor, a second input end of the constant current unit is connected with the output end of the load unit, and the output end of the constant current unit is connected with the output end of the power supply.
Preferably, the load unit includes:
the lighting device comprises a plurality of lighting branches, a load unit and a plurality of LED lamps, wherein the lighting branches are connected in parallel to form the load unit, and each lighting branch is connected with the LED lamps and a third resistor in series.
Preferably, the constant current unit includes:
a collector of the first triode is connected with the third node, a base of the first triode is connected with the first node through the second resistor, and an emitter of the first triode is connected with the fourth node;
the collector electrode of the second triode is connected with the collector electrode of the first triode, the base electrode of the second triode is connected with the fourth node, the emitting electrode of the second triode is connected with the power output end, and a fourth resistor is arranged between the second triode and the emitting electrode of the second triode.
Preferably, the shunting unit includes:
the first parallel circuits are sequentially connected in series to form the shunt unit, and the first parallel circuits comprise a plurality of fifth resistors connected in parallel.
Preferably, the method further comprises the following steps:
one end of the first fuse is connected with the output end of the position switch, and the other end of the first fuse is connected with the first node through an anti-reverse diode.
Preferably, the method further comprises the following steps:
one end of the first transient suppression branch is connected with the other end of the first fuse, one end of the first transient suppression branch is connected with the power output end, and the first transient suppression branch comprises a transient suppressor.
Preferably, the method further comprises the following steps:
one end of the voltage stabilizing branch is connected with the negative electrode of the anti-reverse diode, the other end of the voltage stabilizing branch is connected with the power output end, and the voltage stabilizing branch comprises a capacitor.
Preferably, the method further comprises the following steps:
and one end of the second fuse is connected with the output end of the brake switch, and the other end of the second fuse is connected with the first diode.
Preferably, the method further comprises the following steps:
and one end of the second transient suppression branch is connected with the other end of the second fuse, one end of the second transient suppression branch is connected with the power output end, and the second transient suppression branch comprises a transient suppressor.
The beneficial effects of the above technical scheme are: the economic cost is reduced, the vehicle design area is saved, the vehicle design line type is optimized, and the load service efficiency is improved.
Drawings
FIG. 1 is a general circuit schematic in a preferred embodiment of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The invention is further described with reference to the following drawings and specific examples, which are not intended to be limiting.
A constant current driving circuit for lighting multiplexing is applied to a lamp of an automobile, and as shown in figure 1, the constant current driving circuit comprises:
the input end of the position switch 1 is connected with the power supply input end of the vehicle lamp, and the output end of the position switch 1 is connected with a first node A1;
the input end of the brake switch 2 is connected with the power supply input end of the vehicle lamp, the first output end of the brake switch 2 is connected with a first node A1 through a first diode D1, the second output end of the brake switch 2 is connected with a second node A2 through a second diode D2, and the second node A2 is respectively connected with a grid S1_ G of a first MOS tube and a grid S2_ G of a second MOS tube;
the first input end of the load constant-current unit is connected with the first node A1, the second input end of the load constant-current unit is connected with a third node A3, the third input end of the load constant-current unit is connected with a fourth node A4, and the output end of the load constant-current unit is connected with a power supply output end GND of the vehicle lamp;
one end of the shunt unit 4 is connected with the third node A3, the other end of the shunt unit 4 is connected with the drain S2_ D of the second MOS transistor, and the source S2_ S of the second MOS transistor is connected with the fourth node A4;
the drain S1_ D of the first MOS transistor is connected to the fourth node a4 through a first resistor R1, and the source S1_ S of the first MOS transistor is connected to the output terminal of the power supply.
Specifically, the illumination portion in the vehicle may be divided into different portions according to functions, such as brake illumination, position illumination, and the like, where the brake illumination is vehicle illumination when the driver steps on the brake, illumination with higher brightness is displayed in order to realize a function of warning against rear-end collision, the position illumination is vehicle illumination when the driver normally drives, and illumination with lower brightness is displayed in comparison with the brake illumination in order to realize a function of normal indication width. However, in the prior art, an integrated chip or a plurality of triodes are usually adopted for manufacturing, the technical scheme is to reduce the economic cost, save the vehicle design area, optimize the vehicle design line type and improve the load use efficiency, the same load is adopted for illumination, and the state switching between the position switch 1 and the brake switch 2 is adopted, so that the brightness change of the illumination brightness is adjusted, and the brake illumination and the position illumination multiplexing are realized.
Further, the input end of the position switch 1 and the input end of the brake switch 2 are both connected to the power input end of the vehicle lamp, the output end of the position switch 1 is connected to the first node a1, the first output end of the brake switch 2 is connected to the first node a1 through a first diode D1, the anode of the first diode D1 is connected to the input end of the brake switch 2, the cathode of the first diode D1 is connected to the first node a1, the current direction of the current in the circuit can be controlled by utilizing the unidirectional conductivity of the first diode D1, when the driver drives normally, the position illumination is realized through the position switch 1, and the position illumination does not flow into the circuit connected with the anode of the first diode D1.
Further, a sixth resistor R6, a second node a2 and a seventh resistor R7 are disposed between the second diode D2 and the power output end GND, the second node a2 is connected to a gate S1_ G of the first MOS transistor and a gate S2_ G of the second MOS transistor respectively, so that a voltage division is provided at the second node a2 between the sixth resistor R6 and the seventh resistor R7, when the load constant current unit is switched to the brake switch 2 by a driver, the first MOS transistor S1 and the second MOS transistor S2 are turned on, and a zener diode Z1 is incorporated at two ends of the seventh resistor R7 to implement a voltage stabilizing function.
Specifically, when the driver switches to the position switch 1, the load constant current unit has a low demand for the illumination brightness of the position illumination at this time, and the current value of the inflow illumination light source in the circuit is also small, usually 5mA, which can achieve the normal illumination of the load and maintain the constant current driving state, and when the driver switches to the brake switch 2, the demand for the illumination brightness is high at this time, and the current value of the inflow illumination light source in the circuit is large, usually 40mA, so one end of the shunt unit 4 is connected to the third node A3, the third node A3 is connected to the second input end of the load constant current unit, the other end of the shunt unit 4 is connected to the drain S2_ D of the second MOS transistor, the source S2_ S of the second MOS transistor is connected to the fourth node a4, the fourth node a4 is connected to the third input end of the load constant current unit, and when switching to the brake switch 2, the second MOS transistor S2 is turned on, and the corresponding shunt unit 4 can shunt the current in the load constant current unit, so as to share the power in the load constant current unit, thereby avoiding the situation that the circuit element is damaged due to the excessive current.
Further, a source S2_ S of the second MOS transistor is connected to the fourth node a4, a drain S1_ D of the first MOS transistor is connected to the fourth node a4 through a first resistor R1, an output end of the power supply is connected to a source S1_ S of the first MOS transistor, and a fourth resistor R4 is disposed between a base Q2_ b of the second transistor and an emitter Q2_ e of the second transistor in the load constant current unit, when the load constant current unit is switched to the brake switch 2 by a driver, the first MOS transistor S1 is turned on, and at this time, the first resistor R1 and the fourth resistor R4 are connected in parallel, and then an equivalent resistance value is reduced after the parallel connection, so that a constant current value set by the brake lighting is achieved, and a function of constant current driving is achieved.
The utility model discloses a in the preferred embodiment, load constant current unit includes:
a load unit 31, an input terminal of the load unit 31 is connected to the first node a 1;
and a constant current unit 32, a first input terminal of the constant current unit 32 is connected to the first node a1 through a second resistor R2, a second input terminal of the constant current unit 32 is connected to the output terminal of the load unit 31, and an output terminal of the constant current unit 32 is connected to the output terminal of the power supply.
In a preferred embodiment of the present invention, the load unit 31 includes:
the lighting units comprise a plurality of lighting branches M1 and a plurality of lighting branches M1 which are connected in parallel to form a load unit 31, and each lighting branch M1 is connected with a plurality of LED lamps and a third resistor R3 in series.
Specifically, 3 lighting branches M1 are connected in series in the load unit 31, each lighting branch M1 is connected in series with a plurality of LED lamps and a third resistor R3, where a resistor with a resistance value of 33 ohms is selected from the lighting branches M1M3 as the third resistor R3, and the third resistor R3 is connected in series with 4 LED lamps to form a lighting branch M1.
In a preferred embodiment of the present invention, the constant current unit 32 includes:
a first triode Q1, wherein a collector Q1_ e of the first triode is connected with a third node A3, a base Q1_ b of the first triode is connected with a first node A1 through a second resistor R2, and an emitter Q1_ e of the first triode is connected with a fourth node A4;
a collector Q2_ c of the second triode Q2 is connected with a collector Q1_ e of the first triode, a base Q2_ b of the second triode is connected with a fourth node A4, an emitter Q2_ e of the second triode is connected with a power output end GND, and a fourth resistor R4 is arranged between the second triode Q2 and the emitter Q2_ e of the second triode.
Specifically, when the current flows from the load unit 31 to the first transistor Q1, then from the emitter Q1_ e of the first transistor to the first resistor R1 and the fourth resistor R4, and then to the power output terminal GND, if the current in the load unit 31 increases, the current in the first resistor R1 and the fourth resistor R4 on the same working line also increases, so the voltage drop across the first resistor R1 and the fourth resistor R4 also increases, when the voltage across the first resistor R1 and the fourth resistor R4 is greater than the conducting voltage of the second transistor Q2, the second transistor Q2 is turned on, so that the voltage across the base Q1_ b of the connected first transistor is pulled down, the first transistor Q1 does not work, the voltage across the first resistor R1 and the fourth resistor R4 drops again, and after the voltage drops to be less than the conducting voltage of the second transistor Q2, the second transistor Q2 is turned off again, so that the first transistor Q1 is turned on again, and a dynamic balance is formed, and finally, the currents of the first resistor R1 and the fourth resistor R4 are constant at the conduction voltage drop value of the second triode Q2 divided by the resistances of the first resistor R1 and the fourth resistor R4, so that the LEDs in the load unit 31 on the same working line can also realize constant current operation.
The utility model discloses an in preferred embodiment, include in the reposition of redundant personnel unit 4:
the first parallel circuits M2, the first parallel circuits M2 are sequentially connected in series to form the shunt unit 4, and the first parallel circuit M2 includes a plurality of fifth resistors R5 connected in parallel.
Specifically, when the input voltage is continuously increased, the voltage from the collector Q1_ e to the emitter of the first triode increases, the power of the first triode Q1 becomes large, the temperature rises, the effective power of the first triode Q1 is reduced, the first triode Q1 is damaged, the shunt unit 4 is connected between the collector Q1_ c and the emitter Q1_ e of the first triode, the plurality of first parallel circuits M2 are connected in series in the shunt branch, and the plurality of fifth resistors R5 are connected in parallel in the first parallel circuit M2. Considering that the LED lamp in the load unit 31 is driven by a constant current, in order to ensure that the driving circuit can still normally operate at this time and does not affect the components, the equivalent resistance value of the shunt unit 4 at this time is the maximum value of the voltage Vce divided by the current value by using the ohm's law, and the resistance value is taken as the minimum resistance value, so long as the equivalent resistance value of the shunt unit 4 is greater than or equal to the minimum resistance value, the constant current driving of the LED in the load unit 31 can be ensured. And a plurality of resistors with the resistance value of 130 ohms are selected as the fifth resistor R5, so that the first triode Q1 is protected by shunting the first triode Q1 while the constant-current driving LED lamp is ensured to work.
The utility model discloses a better embodiment, still include:
one end of a first fuse F1 and one end of a first fuse F1 are connected with the output end of the position switch 1, and the other end of the first fuse F1 is connected with a first node A1 through an anti-reverse diode D3.
The utility model discloses a better embodiment, still include:
the first transient suppression branch M3 has one end of the first transient suppression branch M3 connected to the other end of the first fuse F1, one end of the first transient suppression branch M3 connected to the power output GND, and the first transient suppression branch includes a transient suppressor TVS 1.
The utility model discloses a better embodiment, still include:
one end of the voltage stabilizing branch M4 is connected with the cathode of the anti-reverse diode D3, the other end of the voltage stabilizing branch M4 is connected with the power output end GND, and the voltage stabilizing branch M4 comprises a capacitor C1.
Specifically, one end of the voltage-stabilizing branch M4 is connected to the first node a1, and the voltage-stabilizing branch M4 includes a capacitor C1.
The utility model discloses a better embodiment, still include:
and one end of a second fuse F2, one end of the second fuse F2 is connected with the output end of the brake switch 2, and the other end of the second fuse F2 is connected with the first diode D1.
Specifically, the first fuse F1 and the second fuse F2 are both recoverable fuses, when the input current is in the working range, the first fuse F1 and the second fuse F2 do not work, the resistance values of the first fuse F1 and the second fuse F2 are small at the moment, however, when a transient input large current passes through, the first fuse F1 and the second fuse F2 are triggered, the resistance values become infinite, the current value is reduced, and therefore the situation that the large current flows through a rear-end driving circuit and damages the driving circuit is avoided. When the input current is reduced and recovered to a normal value, the self resistance values of the first fuse F1 and the second fuse F2 are recovered to the normal value, and the recoverable fuse is selected as the first fuse F1 and the second fuse F2, so that the driving circuit can be protected, and the situation that other circuit elements are damaged due to damage of the fuses can be avoided
The utility model discloses a better embodiment, still include:
one end of the second transient suppression branch M5 and one end of the second transient suppression branch M5 are connected to the other end of the second fuse F2, one end of the second transient suppression branch M5 is connected to the power output GND, and the second transient suppression branch includes a transient suppressor TVS 2.
Specifically, the TVS1 and TVS2 are used as the transient suppressors of the first transient suppression branch M3 and the second transient suppression branch M5, and when the input voltage suddenly increases to the highest operating voltage of the driving circuit, the transient suppressors will respond instantaneously to pull down the input voltage to the normal operating voltage range.
When the load unit 31 encounters high voltage of external transient, the transient suppressors TVS1 and TVS2 of the first transient suppression branch M3 and the second transient suppression branch M5 respond instantaneously, and the impedance at both ends changes from high impedance to low impedance instantaneously, absorbing an instantaneous large current, thereby clamping the voltage at both ends to a predetermined value. When the transient suppressors TVS1 and TVS2 of the first transient suppression branch M3 and the second transient suppression branch M5 increase current due to the decrease of impedance in response, the resistances of the first fuse F1 and the second fuse F2 increase with triggering, and the current of the loop is reduced, thereby indirectly protecting the transient suppressors from being damaged by overheating due to the absorption of transient large current for a long time. Therefore, when the first fuse F1 and the second fuse F2 are used together with the transient suppressors TVS1 and TVS2 of the first transient suppression branch M3 and the second transient suppression branch M5, the transient high voltage of the external environment is protected highly, and the P5A pulse in the transient anti-interference test in the EMC test ISO7637 standard is adopted.
The above description is only an example of the preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and those skilled in the art should be able to realize the equivalent alternatives and obvious variations of the present invention.
Claims (10)
1. The utility model provides a multiplexing constant current drive circuit of illumination, is applied to the car light of car which characterized in that includes:
the input end of the position switch is connected with the power supply input end of the car lamp, and the output end of the position switch is connected with a first node;
the input end of the brake switch is connected with the power input end of the car lamp, the first output end of the brake switch is connected with the first node through a first diode, the second output end of the brake switch is connected with a second node through a second diode, and the second node is respectively connected with the grid electrode of a first MOS (metal oxide semiconductor) tube and the grid electrode of a second MOS tube;
the first input end of the load constant-current unit is connected with the first node, the second input end of the load constant-current unit is connected with a third node, the third input end of the load constant-current unit is connected with a fourth node, and the output end of the load constant-current unit is connected with the power supply output end of the car lamp;
one end of the shunt unit is connected with the third node, the other end of the shunt unit is connected with the drain electrode of the second MOS tube, and the source electrode of the second MOS tube is connected with the fourth node;
the drain electrode of the first MOS tube is connected with the fourth node through a first resistor, and the source electrode of the first MOS tube is connected with the output end of the power supply.
2. The constant current driving circuit for lighting multiplexing according to claim 1, wherein the load constant current unit comprises:
the input end of the load unit is connected with the first node;
and a first input end of the constant current unit is connected with the first node through a second resistor, a second input end of the constant current unit is connected with the output end of the load unit, and the output end of the constant current unit is connected with the output end of the power supply.
3. An illumination multiplexing constant current driving circuit according to claim 2, wherein the load unit comprises:
the lighting device comprises a plurality of lighting branches, a load unit and a plurality of LED lamps, wherein the lighting branches are connected in parallel to form the load unit, and each lighting branch is connected with the LED lamps and a third resistor in series.
4. An illumination multiplexing constant current driving circuit according to claim 2, wherein the constant current unit comprises:
a collector of the first triode is connected with the third node, a base of the first triode is connected with the first node through the second resistor, and an emitter of the first triode is connected with the fourth node;
the collector electrode of the second triode is connected with the collector electrode of the first triode, the base electrode of the second triode is connected with the fourth node, the emitting electrode of the second triode is connected with the power output end, and a fourth resistor is arranged between the second triode and the emitting electrode of the second triode.
5. The constant current driving circuit for lighting multiplexing according to claim 1, wherein the shunting unit comprises:
the first parallel circuits are sequentially connected in series to form the shunt unit, and the first parallel circuits comprise a plurality of fifth resistors connected in parallel.
6. The constant current driving circuit for lighting multiplexing according to claim 1, further comprising:
one end of the first fuse is connected with the output end of the position switch, and the other end of the first fuse is connected with the first node through an anti-reverse diode.
7. The illumination multiplexing constant current drive circuit according to claim 6, further comprising:
one end of the first transient suppression branch is connected with the other end of the first fuse, one end of the first transient suppression branch is connected with the power output end, and the first transient suppression branch comprises a transient suppressor.
8. The illumination multiplexing constant current drive circuit according to claim 6, further comprising:
one end of the voltage stabilizing branch is connected with the negative electrode of the anti-reverse diode, the other end of the voltage stabilizing branch is connected with the power output end, and the voltage stabilizing branch comprises a capacitor.
9. The constant current driving circuit for lighting multiplexing according to claim 1, further comprising:
and one end of the second fuse is connected with the output end of the brake switch, and the other end of the second fuse is connected with the first diode.
10. The illumination multiplexing constant current driving circuit according to claim 9, further comprising:
and one end of the second transient suppression branch is connected with the other end of the second fuse, one end of the second transient suppression branch is connected with the power output end, and the second transient suppression branch comprises a transient suppressor.
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| CN201922487705.1U CN212013133U (en) | 2019-12-31 | 2019-12-31 | Constant-current driving circuit for lighting multiplexing |
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| CN201922487705.1U CN212013133U (en) | 2019-12-31 | 2019-12-31 | Constant-current driving circuit for lighting multiplexing |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113677067A (en) * | 2021-08-19 | 2021-11-19 | 上汽大众汽车有限公司 | Dynamic control method and control system for vehicle brake lamp |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113677067A (en) * | 2021-08-19 | 2021-11-19 | 上汽大众汽车有限公司 | Dynamic control method and control system for vehicle brake lamp |
| CN113677067B (en) * | 2021-08-19 | 2023-08-04 | 上汽大众汽车有限公司 | Dynamic control method and control system for vehicle brake lamp |
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