CN218976880U - LED lamp driving circuit - Google Patents
LED lamp driving circuit Download PDFInfo
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- CN218976880U CN218976880U CN202222927771.8U CN202222927771U CN218976880U CN 218976880 U CN218976880 U CN 218976880U CN 202222927771 U CN202222927771 U CN 202222927771U CN 218976880 U CN218976880 U CN 218976880U
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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
An LED lamp driving circuit comprises a voltage input end, a voltage stabilizing circuit, a protection circuit, an LED current setting circuit and an LED lamp; the input end of the voltage stabilizing circuit and the input end of the protection circuit are respectively connected with the voltage input end, the output end of the voltage stabilizing circuit is connected with one end of the LED current setting circuit, and the voltage stabilizing circuit is used for converting the input voltage from the voltage input end into stable voltage and then outputting the stable voltage; the control output end of the protection circuit is connected with the control input end of the voltage stabilizing circuit and is used for controlling the voltage stabilizing circuit to stop working when the input voltage of the voltage input end is higher than a preset voltage; the other end of the LED current setting circuit is connected with the anode of the LED lamp, the cathode of the LED lamp is grounded, and the current setting circuit can change the current flowing through the LED lamp. The utility model has low cost, high current precision and easy realization of miniaturization of products.
Description
Technical Field
The utility model relates to an LED control technology.
Background
Along with the improvement of the living standard of people, the requirements on the comfort of automobiles are higher and higher,atmosphere lamps have become an indispensable configuration in automobiles. For the middle-low end vehicle type, although the functional requirements for the atmosphere lamp are not high, the development of the atmosphere lamp is still required according to the related automobile standard specification. In the middle-low end vehicle type, the requirement of no color change on the atmosphere lamp is met, and the lower the cost is, the better the brightness requirement is. At present, the common low-cost atmosphere lamp control scheme does not use an LED driving chip to control an atmosphere lamp, as shown in fig. 1, when a power supply KL15 is powered on, an LED lamp LED101 serving as the atmosphere lamp is lighted, when the power is turned off, the LED lamp LED101 is turned off, and the current flowing through the LED lamp LED101 is as follows:
wherein V is KL15 For the voltage of the power supply KL15, V D101 For the conduction voltage drop of diode D101, V LED101 R is the conduction voltage drop of the LED101 of the LED lamp 101 Is the resistance of the resistor R101.
The existing atmosphere lamp driving circuit mainly has the following defects:
1. the current accuracy is low. For a 12V power supply system, normal operation is required in the range of 9V to 16V, assuming V LED101 ＝3V，V D101 Deviations in current accuracy for the case of =1v, 9V and 16V supply are:
if the temperature characteristic of PN junction is added, the deviation is larger;
2, the cost of passing the test is high. For a 12V battery standard of a certain manufacturer, it is required to pass the Jump start test (Jump start test, highest voltage 26V,1 min). Assuming that the current corresponding to the battery voltage of 3V and 13V of the conducting voltage drop of the LED lamp is 20mA, the resistor R101 at the moment should be 500 omega of resistor, and when the voltage of the power supply port is 26V, the power of the resistor R101 is
The power of a single common chip resistor R1206 is 0.25W, in order to pass the test stably, 5R 1206 resistors are needed to meet the requirement at the moment, soThe required cost is high;
3. the product miniaturization requirement cannot be met. Under the conditions assumed in point 2 above, 5R 1206 resistors are required, and then a sufficiently large PCB size is required, which is in contradiction with the miniaturization requirements of the product.
Disclosure of Invention
The utility model aims to solve the technical problem of providing the LED lamp control circuit which is low in cost, high in current precision and easy to realize miniaturization of products.
The embodiment of the utility model provides an LED lamp driving circuit which comprises a voltage input end, a voltage stabilizing circuit, a protection circuit, an LED current setting circuit and an LED lamp, wherein the voltage stabilizing circuit is connected with the voltage input end; the input end of the voltage stabilizing circuit and the input end of the protection circuit are respectively connected with the voltage input end, the output end of the voltage stabilizing circuit is connected with one end of the LED current setting circuit, and the voltage stabilizing circuit is used for converting the input voltage from the voltage input end into stable voltage and then outputting the stable voltage; the control output end of the protection circuit is connected with the control input end of the voltage stabilizing circuit and is used for controlling the voltage stabilizing circuit to stop working when the input voltage of the voltage input end is higher than a preset voltage; the other end of the LED current setting circuit is connected with the anode of the LED lamp, the cathode of the LED lamp is grounded, and the current setting circuit can change the current flowing through the LED lamp.
The utility model has at least the following advantages:
according to the embodiment of the utility model, on the basis of not arranging the LED driving chip, the voltage stabilizing circuit and the protection circuit are arranged, so that the current precision is improved, the manufacturing cost is reduced, the reliability of a product is improved, and meanwhile, the miniaturization of the product can be realized.
Drawings
Fig. 1 shows a circuit diagram of a prior art atmosphere lamp driving circuit.
Fig. 2 shows a circuit diagram of an LED lamp driving circuit according to an embodiment of the present utility model.
Detailed Description
The utility model will now be described in detail with reference to the drawings and specific examples.
Fig. 2 shows a circuit diagram of an LED lamp driving circuit according to an embodiment of the present utility model. Please refer to fig. 2. The LED lamp driving circuit according to an embodiment of the present utility model includes a voltage input terminal In, a voltage stabilizing circuit 2, a protection circuit 3, an LED current setting circuit 4, and an LED lamp LED101.
The input end of the voltage stabilizing circuit 2 and the input end of the protection circuit 3 are respectively connected with a voltage input end In, the output end of the voltage stabilizing circuit 2 is connected with one end of the LED current setting circuit 4, and the voltage stabilizing circuit 2 is used for converting the input voltage from the voltage input end In into stable voltage and then outputting the stable voltage.
The control output terminal of the protection circuit 3 is connected to the control input terminal of the voltage stabilizing circuit 2, and is used for controlling the voltage stabilizing circuit 2 to stop working when the input voltage of the voltage input terminal In is higher than a predetermined voltage.
The other end of the LED current setting circuit 4 is connected with the anode of the LED lamp LED101, the cathode of the LED lamp LED101 is grounded, and the current setting circuit 4 can change the magnitude of the current flowing through the LED lamp LED101.
Further, the LED lamp driving circuit of this embodiment includes an anti-reverse connection circuit 5, an input end of the anti-reverse connection circuit 5 is connected with the voltage input end In, and an output end of the anti-reverse connection circuit 5 is connected with an input end of the voltage stabilizing circuit 2 and an input end of the protection circuit 3, respectively.
In the present embodiment, the reverse connection preventing circuit 5 includes a diode D101, a capacitor C1, and a capacitor C2. The anode of the diode D101 is connected to the voltage input terminal In, and the cathode of the diode D101 is connected to the input terminal of the voltage stabilizing circuit 2 and the input terminal of the protection circuit 3, respectively. One end of the capacitor C1 is connected to the common contact point of the voltage input end In and the anode of the diode D101, and the other end of the capacitor C1 is grounded; one end of the capacitor C2 is connected to the cathode of the diode D101, the common contact of the input terminal of the voltage stabilizing circuit 2 and the input terminal of the protection circuit 3, and the other end of the capacitor C2 is grounded.
The diode D101 in the anti-reverse connection circuit 5 can avoid the phenomenon that electronic components are burnt out after the power line and the ground line are connected reversely, and meets the requirement of an automobile on the anti-reverse connection circuit. The capacitor C1 and the capacitor C2 can effectively prevent ESD and attenuate the fluctuation of the power port voltage.
In the present embodiment, the voltage stabilizing circuit 2 includes a first switching element Q101 and a zener diode D102. The first conducting end of the first switching element Q101 is connected to the voltage input end In, the second conducting end of the first switching element Q101 is connected to one end of the LED current setting circuit 4, the control end of the first switching element Q101 is connected to the control output end of the protection circuit 3 and the cathode of the zener diode D102, and the anode of the zener diode D102 is grounded.
In the example in the figure, the first switching element Q101 is constituted by a first NPN transistor Q101 having a base, a collector, and an emitter constituting a control terminal, a first conduction terminal, and a second conduction terminal, respectively. The output voltage of the voltage stabilizing circuit 2 (i.e. the emitter voltage V of the first NPN triode Q101 e_Q101 ) Voltage stabilizing value V of zener diode D102 T_D102 And the base-emitter voltage V of the first NPN triode Q101 be_Q101 Has the following relationship: v (V) e_Q101 ＝V T_D102 -V be_Q101 。V T_D102 Is relative stable with the selected parameters of the voltage stabilizing tube, V be_Q101 Is related to the characteristics of the triode and is a relatively stable parameter, so that the voltage fluctuation at the power supply side can not influence V e_Q101 Is relatively stable.
In the present embodiment, the protection circuit 3 includes a voltage sampling circuit 31 and a protection control circuit 32. The input end of the voltage sampling circuit 31 is connected with the voltage input end In, the output end of the voltage sampling circuit 31 is connected with the input end of the protection control circuit 32, and the voltage sampling circuit 31 is used for converting the input voltage of the voltage input end In into a voltage suitable for the operation of the protection control circuit 32. An output terminal of the protection control circuit 32 is connected to a control input terminal of the voltage stabilizing circuit 2, for controlling the voltage stabilizing circuit 2 to stop operation when the output voltage of the voltage sampling circuit 31 is higher than a predetermined off threshold voltage.
The voltage sampling circuit 31 is a voltage dividing circuit, and the voltage dividing circuit includes a resistor R102 and a resistor R103, wherein one end of the resistor R102 is respectively connected to the voltage input terminal In and the first conducting terminal of the switching element Q101, the other end of the resistor R102 is connected to one end of the resistor R103, and the other end of the resistor R103 is grounded. The protection control circuit 32 includes a second switching element Q102, where a control terminal of the second switching element Q102 is connected to a common contact between the other end of the resistor R102 and one end of the resistor R103, and a first conductive terminal of the second switching element Q102 is connected to the voltage input terminal In, one end of the resistor R102, and a first conductive terminal of the first switching element Q101, respectively, and a second conductive terminal of the second switching element Q102 is grounded.
In the example in the figure, the second switching element Q102 is constituted by a second NPN transistor Q102 whose base, collector, and emitter constitute a control terminal, a first conduction terminal, and a second conduction terminal, respectively.
Further, the protection control circuit 32 includes a resistor R104, one end of the resistor R104 is connected to the voltage input terminal, one end of the resistor R102, and the first conductive terminal of the first switching element Q101, and the other end of the resistor R104 is connected to the first conductive terminal of the second switching element Q102.
The state of the second NPN triode Q102 is controlled by utilizing the voltage division of the resistor R102 and the resistor R103, and the output voltage V of the voltage division circuit R103 Will increase with increasing input voltage, when V R103 Increasing to turn-on threshold V of second NPN transistor Q102 T_Q102 When (i.e., the off threshold voltage), the second NPN triode Q102 is turned on to make the base voltage V of the first NPN triode b_Q101 And the voltage is pulled down to GND, so that the first NPN triode Q101 is closed, and the phenomenon that the first NPN triode Q101 is burnt out due to overlarge power consumption caused by overlarge input voltage is avoided.
In this embodiment, the LED current setting circuit 4 includes a resistor R101, one end of the resistor R101 is connected to the output end of the voltage stabilizing circuit 2, and the other end of the resistor R101 is connected to the anode of the LED lamp LED101.
The magnitude of the current flowing through the LED101 of the LED lamp can be changed by adjusting the magnitude of the resistor R101, due to V e_Q101 Is relatively stable, and the current flowing through the LED lamp LED101 is not affected by the variation of the input voltage, and the current flowing through the LED lamp LED101 is also relatively stable.
In one specific application, the aforementioned LED lamp LED101 is an atmosphere lamp for a vehicle.
The LED lamp driving circuit according to the embodiment of the utility model has the following advantages.
1. The precision is high:
the embodiment of the utility model utilizes the voltage stabilizing circuit to ensure V e_Q101 The influence of input voltage fluctuation on the current flowing through the LED lamp is avoided, and the relative stability of the voltages flowing through the two ends of the LED lamp is ensured. V of the first NPN triode Q101 in the range of-40-85 DEG C be_Q101 The variation of (2) is within 0.3V, V of the zener diode D102 T_D102 Is relatively stable, the on-voltage drop V of the LED101 of the LED lamp LED101 The variation of (2) is within 0.5V. Suppose that the model of the selected zener diode is: BZT52H-B7V5, at-40 deg.C, current flows through the LED lamp
At 85℃the current through the LED lamp is +.>
Therefore, in the ambient temperature range of-40 to 85 ℃, the accuracy of the current flowing through the LED lamp is: />
The current precision of the conventional LED driving circuit without the driving chip is only 140%, so that the current precision of the embodiment of the utility model is far higher than that of the conventional LED driving circuit.
2. The system is stable and reliable:
the embodiment of the utility model ensures the current precision of the LED in the process of changing the power supply voltage by 9-16V by utilizing the voltage stabilizing circuit principle, and avoids the phenomenon that electronic components are burnt out due to high voltage or larger power consumption by utilizing the protection circuit of the power supply port. Thereby ensuring that the electric correlation experiment such as a Jump start test (26V, 1 min) and a 5a or 5b test can be stably passed;
assuming that the current flowing through the LED lamp is 20mA, the threshold of the base conduction of the triode is 0.4V, and r102=20kΩ, r103=510 Ω are selected, when the input voltage of the voltage input terminal In (power supply voltage KL 30) is 16.5V, V be_Q102 The second NPN triode Q102 is turned off at the time of=0.4v, and the output of the voltage stabilizing circuit is 0V, so that the LED lamp is turned off, and the safety of each electronic component is ensured;
when the input voltage of the voltage input terminal In is 16V, the power consumption of the first NPN triode Q101 is
Junction temperature T of triode j The temperature is not lower than 150 ℃, so that the triode cannot be burnt out due to overlarge power consumption;
when the input voltage of the voltage input terminal In is lower than 16V, the power consumption of each electronic component is lower, and the system is more stable.
3. Small size, low cost:
the triode of the embodiment of the utility model has lower power consumption, the requirements can be met by selecting the universal triode BC817-25 with smaller package and cheaper price, and the actual power consumption of the resistor R101 for setting current is as follows
Therefore, the R101 resistor can meet the requirements by selecting the R0603 package, the R0603 or R0402 package can meet the requirements by selecting the resistors at other positions only as pull-up or voltage division, the voltage stabilizing diode only provides a relatively stable reference voltage, the BZT52H series is selected by considering the cost and the package, and the parameters of electronic components at other positions are selected according to the actual requirements. Because the electronic components are commonly used and the package is smaller, the product can be made smaller under the condition of lower cost.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present utility model without departing from the spirit or scope of the utility model. Thus, it is intended that the present utility model also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (10)
1. The LED lamp driving circuit is characterized by comprising a voltage input end, a voltage stabilizing circuit, a protection circuit, an LED current setting circuit and an LED lamp;
the input end of the voltage stabilizing circuit and the input end of the protection circuit are respectively connected with the voltage input end, the output end of the voltage stabilizing circuit is connected with one end of the LED current setting circuit, and the voltage stabilizing circuit is used for converting the input voltage from the voltage input end into stable voltage and then outputting the stable voltage;
the control output end of the protection circuit is connected with the control input end of the voltage stabilizing circuit and is used for controlling the voltage stabilizing circuit to stop working when the input voltage of the voltage input end is higher than a preset voltage;
the other end of the LED current setting circuit is connected with the anode of the LED lamp, the cathode of the LED lamp is grounded, and the current setting circuit can change the current flowing through the LED lamp.
2. The LED lamp driving circuit of claim 1, wherein the protection circuit comprises a voltage sampling circuit and a protection control circuit;
the input end of the voltage sampling circuit is connected with the voltage input end, the output end of the voltage sampling circuit is connected with the input end of the protection control circuit, and the voltage sampling circuit is used for converting the input voltage of the voltage input end into a voltage suitable for the operation of the protection control circuit;
the output end of the protection control circuit is connected with the control input end of the voltage stabilizing circuit and is used for controlling the voltage stabilizing circuit to stop working when the output voltage of the voltage sampling circuit is higher than a preset disconnection threshold voltage.
3. The LED lamp driving circuit according to claim 2, wherein the voltage stabilizing circuit comprises a first switching element Q101 and a zener diode D102;
the first conducting end of the first switching element Q101 is connected to the voltage input end, the second conducting end of the first switching element Q101 is connected to one end of the LED current setting circuit, the control end of the first switching element Q101 is connected to the control output end of the protection circuit and the cathode of the zener diode D102, and the anode of the zener diode D102 is grounded.
4. The LED lamp driving circuit according to claim 3, wherein the voltage sampling circuit is a voltage dividing circuit, the voltage dividing circuit includes a resistor R102 and a resistor R103, one end of the resistor R102 is connected to the voltage input terminal and the first conducting terminal of the switching element Q101, the other end of the resistor R102 is connected to one end of the resistor R103, and the other end of the resistor R103 is grounded;
the protection control circuit comprises a second switching element Q102, a control end of the second switching element Q102 is connected to a common contact point between the other end of the resistor R102 and one end of the resistor R103, a first conducting end of the second switching element Q102 is respectively connected with a voltage input end, one end of the resistor R102 and a first conducting end of the first switching element Q101, and a second conducting end of the second switching element Q102 is grounded.
5. The LED lamp driving circuit according to claim 4, wherein the first switching element Q101 and the second switching element Q102 are NPN transistors, and a base, a collector, and an emitter of the NPN transistors respectively form a control terminal, a first conduction terminal, and a second conduction terminal of the switching elements;
the protection control circuit comprises a resistor R104, one end of the resistor R104 is respectively connected with the voltage input end, one end of the resistor R102 and the first conducting end of the first switching element Q101, and the other end of the resistor R104 is connected with the first conducting end of the second switching element Q102.
6. The LED lamp driving circuit according to claim 1, wherein the LED current setting circuit comprises a resistor R101, one end of the resistor R101 is connected with the output end of the voltage stabilizing circuit, and the other end of the resistor R101 is connected with the anode of the LED lamp.
7. The LED lamp driving circuit of claim 1, wherein the LED lamp driving circuit comprises an anti-reverse connection circuit, an input end of the anti-reverse connection circuit is connected with the voltage input end, and an output end of the anti-reverse connection circuit is connected with an input end of the voltage stabilizing circuit and an input end of the protection circuit respectively.
8. The LED lamp driving circuit of claim 7, wherein the anti-reverse connection circuit comprises a diode D101, an anode of the diode D101 is connected to the voltage input terminal, and a cathode of the diode D101 is connected to the input terminal of the voltage stabilizing circuit and the input terminal of the protection circuit, respectively.
9. The LED lamp driving circuit of claim 8, wherein the anti-reverse circuit comprises a capacitor C1 and a capacitor C2;
one end of the capacitor C1 is connected to the common contact point of the voltage input end and the anode of the diode D101, and the other end of the capacitor C1 is grounded;
one end of the capacitor C2 is connected to the cathode of the diode D101, the common contact point of the input end of the voltage stabilizing circuit and the input end of the protection circuit, and the other end of the capacitor C2 is grounded.
10. The LED lamp driving circuit according to claim 1, wherein the LED lamp is an atmosphere lamp of a vehicle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222927771.8U CN218976880U (en) | 2022-11-03 | 2022-11-03 | LED lamp driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222927771.8U CN218976880U (en) | 2022-11-03 | 2022-11-03 | LED lamp driving circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218976880U true CN218976880U (en) | 2023-05-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222927771.8U Active CN218976880U (en) | 2022-11-03 | 2022-11-03 | LED lamp driving circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218976880U (en) |
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2022
- 2022-11-03 CN CN202222927771.8U patent/CN218976880U/en active Active
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