CN210469821U - Constant current driving circuit for car lamp - Google Patents
Constant current driving circuit for car lamp Download PDFInfo
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- CN210469821U CN210469821U CN201921314601.4U CN201921314601U CN210469821U CN 210469821 U CN210469821 U CN 210469821U CN 201921314601 U CN201921314601 U CN 201921314601U CN 210469821 U CN210469821 U CN 210469821U
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Abstract
The utility model discloses a car light constant current drive circuit, include: the constant current source module adopts a single-chip constant current source integrated circuit and is used for generating constant current output when being connected with a power supply; the load module, connect direct current supply voltage with between single-chip constant current source integrated circuit's power end, the power positive end to produce stable ray radiation in order to realize the illumination effect under the drive of constant current, through the utility model discloses, can realize that an components and parts are few, with low costs, small, do not have installation limitation and can not produce electromagnetic radiation's car light constant current drive circuit.
Description
Technical Field
The utility model relates to a car light constant current control technical field especially relates to a car light constant current drive circuit.
Background
Vehicle lights are essential components for driving safety. Generally, the current is undulant when the car light is used, and car light constant current drive circuit then can make the car light work in certain current and voltage range, the protection car light, when the car light was used for a long time in addition, can make car light ambient temperature rise, and car light constant current drive circuit still possesses the effect of derating for the car light temperature falls, therefore car light constant current drive circuit is very important to the car light design.
Fig. 1 is a circuit configuration diagram of a conventional constant current driving circuit of a vehicle lamp in the prior art. As shown in fig. 1, the constant current driving circuit is a switching circuit, specifically, a power supply voltage VCC is connected to one end of a filter capacitor C1, a cathode of a freewheeling diode D2, a power supply input terminal VIN of a monolithic integrated circuit U1 and one end of a current-limiting resistor R1, the other end of the filter capacitor C1 is grounded, an anode of the freewheeling diode D2 is connected to a switching signal output terminal SW of the monolithic integrated circuit U1 and one end of an energy-storing inductor L1, the other end of the current-limiting resistor R1 is connected to a detection terminal CS of the monolithic integrated circuit U1 and an anode of an LED lamp LED1 to form a first output node LED +, a power supply negative terminal of the monolithic integrated circuit U1 is grounded, the other end of the energy-storing inductor L1 is connected to a cathode of an LED lamp LED3 to form a second output node LED-, and the LED lamps LED1-LED3 are connected in series in the same: the circuit is a voltage reduction constant current source in a continuous inductive current conduction mode, a high-end current sampling mode is adopted, and the average current of the LED lamp is set through an external current limiting resistor.
However, the above-described constant current driving circuit has the following disadvantages: the circuit has a complex structure and many components; the circuit is internally provided with an inductor which can generate some electromagnetic radiation and possibly influence the use of the automobile radio; because components and parts are many, the volume of a driving circuit is large, and the driving circuit is limited when being installed in an automobile lamp and can not be installed in some cases.
SUMMERY OF THE UTILITY MODEL
For overcoming the not enough of above-mentioned prior art existence, the utility model aims to provide a car light constant current drive circuit to realize that an components and parts are few, with low costs, small, do not install the limitation and can not produce electromagnetic radiation's car light constant current drive circuit.
In order to achieve the above and other objects, the present invention provides a constant current driving circuit for a vehicle lamp, including:
the constant current source module adopts a single-chip constant current source integrated circuit chip, a power supply end and a power supply positive end of the constant current source module are connected to the voltage of a direct current power supply through the load module, and a power supply negative end is grounded;
and the load module is connected between the direct-current power supply voltage and a power supply end and a power supply positive end of the single-chip constant-current source integrated circuit so as to generate stable light radiation under the drive of constant current to realize the illumination effect.
Preferably, the load module comprises a plurality of LED lamps connected in series between a dc power supply voltage and a power supply terminal and a power supply positive terminal of the single-chip constant current source integrated circuit chip.
Preferably, the circuit further comprises an electrodeless circuit, connected to the load module, for converting an arbitrarily connected input voltage into a dc power supply voltage with a determined polarity and supplying the dc power supply voltage to the load module.
Preferably, the electrodeless circuit is a full-bridge rectifying circuit D1 composed of 4 diodes.
Preferably, the input voltage is connected to the ac input terminals IN1 and IN2 of the full-bridge rectifier circuit D1, the full-bridge rectifier circuit D1 is the negative terminal, and the output port of the full-bridge rectifier circuit D1 outputs the dc power voltage to the load module.
Preferably, the circuit further comprises a current limiting circuit, wherein the current limiting circuit is connected between the electrodeless circuit and the load module and is used for adapting to different direct current power supply voltages so as to stabilize effective direct current power supply voltages supplied to the constant current source module and the load module.
Preferably, the current limiting circuit comprises one or more power resistors connected between the electrodeless circuit and the load module.
Preferably, the single-chip constant current source integrated circuit chip at least comprises a low-voltage-difference voltage stabilizing circuit, a reference voltage circuit, a feedback operational amplifier, a power MOS transistor and an internal current limiting resistor, wherein the low-voltage-difference voltage stabilizing circuit is connected with the reference voltage circuit and then connected to a positive input end of the feedback operational amplifier, an inverted input end of the feedback operational amplifier is grounded through the internal current limiting resistor, an output end of the feedback operational amplifier is connected with a grid electrode of the power MOS transistor, a drain electrode of the power MOS transistor is connected with a power end of a power supply, and a source electrode of the feedback operational.
Compared with the prior art, the utility model relates to a car light constant current drive circuit produces the constant current output through the constant current source module who adopts single-chip constant current source integrated circuit chip when connecing the power, with load module connect direct current supply voltage with between single-chip constant current source integrated circuit's power end, the power positive end to produce stable ray radiation under the drive of constant current and in order to realize the illumination effect, realized that a components and parts are few, with low costs, small, do not install the car light constant current drive circuit of limitation.
Drawings
FIG. 1 is a circuit diagram of a constant current driving circuit of a vehicle lamp in the prior art;
fig. 2 is a circuit diagram of a first embodiment of a constant current driving circuit for a vehicle lamp according to the present invention;
fig. 3 is a circuit diagram of a second embodiment of the constant current driving circuit for a vehicular lamp according to the present invention;
fig. 4 is a circuit diagram of a third embodiment of the constant current driving circuit for a vehicular lamp according to the present invention;
fig. 5 is a detailed structure diagram of the single-chip constant current source integrated circuit chip U1 according to an embodiment of the present invention.
Detailed Description
Other advantages and effects of the present invention will become apparent to those skilled in the art from the following description, which is made for the purpose of illustrating the embodiments of the present invention by way of specific examples and with reference to the accompanying drawings. The present invention can be implemented or applied by other different embodiments, and various details in the present specification can be modified and changed based on different viewpoints and applications without departing from the spirit of the present invention.
Fig. 2 is a circuit diagram of a first embodiment of the constant current driving circuit for a vehicular lamp according to the present invention. As shown in fig. 2, the utility model relates to a car light constant current drive circuit, include: the device comprises a constant current source module 1, a load module 2, a current limiting circuit 3 and an electrodeless circuit 4.
The constant current source module 1 is a single-chip constant current source integrated circuit chip U1 and is used for generating constant current output when a power supply is connected; the load module 2 is composed of a plurality of LED lamps, and is used for generating stable light radiation under the driving of constant current to realize lighting effect, and the embodiment uses 3 vehicle LED lamps LED1-LED 3; the current limiting circuit 3 is composed of one or more power resistors and is used for adapting to different power supply voltages to stably supply effective power supply voltages to the constant current source module 1 and the load module 2 so as to obtain the same illumination and protect lamps, the current limiting circuit is a resistor R1 in the embodiment, because the voltages of different automobile (truck and car) lamps are different and the corresponding powers are different, the current limiting circuit is equivalent to the action of power consumption and voltage division to adjust the voltage and the power of the lamps; the electrodeless circuit 4 is composed of a full-bridge rectifying circuit D1 composed of 4 diodes, and is configured to convert an arbitrarily connected input voltage into a dc power supply voltage with a determined polarity.
Specifically, the input voltage is connected to the ac input terminal IN1 (input port 1) and IN2 (input port 3) of the full-bridge rectifier circuit D1, the port 4 of the full-bridge rectifier circuit D1 is the negative terminal of the output dc power, i.e., ground, the port 2 of the full-bridge rectifier circuit D1 is the positive terminal of the output dc power, the positive terminal of the output dc power is connected to one end of the current-limiting resistor R1, the other end of the current-limiting resistor R1 is connected to the anode of the LED1, the cathode of the LED1 is connected to the anode of the LED2, the cathode of the LED2 is connected to the anode of the LED3, the cathode of the LED3 is connected to the power supply positive terminal VCC and the power supply terminal VP of the monolithic constant current source integrated circuit U1, and the power.
In order to reduce the cost and the volume, the current limiting circuit 3 can be omitted for the occasion with proper voltage, namely the current limiting resistor R1 is removed, and the constant current driving circuit of the car lamp only comprises a constant current source module 1, a load module 2 and an electrodeless circuit 4, as shown in figure 3.
For further reduce cost and reduce volume, the occasion that can guarantee to input mains voltage polarity can also further save electrodeless circuit 4, gets rid of full-bridge rectifier circuit D1 promptly, and this car light constant current drive circuit only includes constant current source module 1, load module 2, as shown in fig. 4, promptly the utility model discloses basic constant current source circuit.
Fig. 5 shows a circuit structure diagram of a single-chip constant current source integrated circuit chip U1, which includes a low dropout regulator LDO, a reference voltage circuit Vref, a feedback operational amplifier OP, a power MOS transistor M1, and an internal current limiting resistor R, where a current returns to a power negative terminal VN from a power port VP through the MOS transistor M1 and the resistor R, the feedback operational amplifier OP samples from one end of the resistor, when the current flowing through the internal current limiting resistor R (built-in resistor) increases, a voltage drop of the internal current limiting resistor R increases, and an inverted input terminal voltage of the feedback operational amplifier OP increases, which causes a voltage at an output terminal of the feedback operational amplifier, i.e., a gate voltage of the power MOS transistor M1, to decrease a gate-source voltage of the power MOS transistor, and the gate-source voltage decrease causes a decrease in an output current of the power MOS transistor, which is repeated, so that an output current of the power.
Regarding the resistance value of the built-in resistor, different currents correspond to different resistance values for different models of chip constant current source integrated circuits U1, the voltage drop value of the resistor is sampled by the operational amplifier, the reference voltage Vref of the feedback operational amplifier is 0.15V, and for a model with 150mA of output current, the built-in resistance value is 0.15V/0.15A which is 1 Ω.
During manufacture, a single-chip constant current source integrated circuit chip IC and a corresponding external circuit are placed on a rectangular circuit board for die bonding, then wires are welded, and finally packaging is carried out, a layer of black dots is packaged on the surface of the single-chip constant current source integrated circuit chip, and the chip is well protected.
To sum up, the utility model relates to a car light constant current drive circuit produces the constant current output through the constant current source module who adopts single-chip constant current source integrated circuit chip when connecing the power, with load module connect direct current supply voltage with between single-chip constant current source integrated circuit's the power end, the power positive end to produce stable ray radiation under the drive of constant current and in order to realize the illumination effect, realized that a components and parts are few, with low costs, small, do not have the limitation car light constant current drive circuit of installation. The above embodiments are merely illustrative of the principles and effects of the present invention, and are not to be construed as limiting the invention. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention should be as set forth in the claims.
Claims (8)
1. A constant current driving circuit for a vehicle lamp, the circuit comprising:
the constant current source module adopts a single-chip constant current source integrated circuit chip, a power supply end and a power supply positive end of the constant current source module are connected to the voltage of a direct current power supply through the load module, and a power supply negative end is grounded;
and the load module is connected between the direct-current power supply voltage and a power supply end and a power supply positive end of the single-chip constant-current source integrated circuit chip so as to generate stable light radiation under the drive of constant current to realize the illumination effect.
2. A constant current driving circuit for a vehicular lamp according to claim 1, wherein: the load module comprises a plurality of LED lamps which are connected in series between the direct-current power supply voltage and a power supply end and a power supply positive end of the single-chip constant-current source integrated circuit chip.
3. A constant current driving circuit for a vehicular lamp according to claim 1, wherein: the circuit further comprises an electrodeless circuit, wherein the electrodeless circuit is connected with the load module and is used for converting any connected input voltage into direct-current power supply voltage with determined polarity and supplying the direct-current power supply voltage to the load module.
4. A constant current driving circuit for a vehicular lamp according to claim 3, wherein: the electrodeless circuit is a full-bridge rectifying circuit D1 composed of 4 diodes.
5. The constant current driving circuit for the vehicle lamp according to claim 4, wherein: the input voltage is connected to the ac input terminals IN1 and IN2 of the full-bridge rectifier circuit D1, the negative terminal of the full-bridge rectifier circuit D1, and the output port of the full-bridge rectifier circuit D1 outputs the dc power voltage to the load module.
6. The constant current driving circuit for the vehicle lamp according to claim 5, wherein: the circuit further comprises a current limiting circuit, wherein the current limiting circuit is connected between the electrodeless circuit and the load module and is used for adapting to different direct current power supply voltages so as to stably supply effective direct current power supply voltages to the constant current source module and the load module.
7. The constant current driving circuit for the vehicle lamp according to claim 6, wherein: the current limiting circuit comprises one or more power resistors connected between the electrodeless circuit and the load module.
8. A constant current driving circuit for a vehicular lamp according to claim 1, wherein: the single-chip constant current source integrated circuit chip at least comprises a low-voltage-difference voltage stabilizing circuit, a reference voltage circuit, a feedback operational amplifier, a power MOS tube and an internal current-limiting resistor, wherein the low-voltage-difference voltage stabilizing circuit is connected with the reference voltage circuit and then connected to the positive input end of the feedback operational amplifier, the negative input end of the feedback operational amplifier is grounded through the internal current-limiting resistor, the output end of the feedback operational amplifier is connected with the grid electrode of the power MOS tube, the drain electrode of the power MOS tube is connected with the power end of the power supply, and the source electrode of.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921314601.4U CN210469821U (en) | 2019-08-14 | 2019-08-14 | Constant current driving circuit for car lamp |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921314601.4U CN210469821U (en) | 2019-08-14 | 2019-08-14 | Constant current driving circuit for car lamp |
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| CN210469821U true CN210469821U (en) | 2020-05-05 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110493914A (en) * | 2019-08-14 | 2019-11-22 | 广州竟合电子科技有限公司 | A kind of car light constant current driving device and its manufacturing method |
| CN113015289A (en) * | 2021-03-15 | 2021-06-22 | 无锡英迪芯微电子科技股份有限公司 | LED constant current drive circuit with low power consumption |
-
2019
- 2019-08-14 CN CN201921314601.4U patent/CN210469821U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110493914A (en) * | 2019-08-14 | 2019-11-22 | 广州竟合电子科技有限公司 | A kind of car light constant current driving device and its manufacturing method |
| CN113015289A (en) * | 2021-03-15 | 2021-06-22 | 无锡英迪芯微电子科技股份有限公司 | LED constant current drive circuit with low power consumption |
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