CN108575007B - Dimming and brightening processing device of LED constant current circuit based on indoor lamp gate control gear - Google Patents
Dimming and brightening processing device of LED constant current circuit based on indoor lamp gate control gear Download PDFInfo
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- CN108575007B CN108575007B CN201710140958.4A CN201710140958A CN108575007B CN 108575007 B CN108575007 B CN 108575007B CN 201710140958 A CN201710140958 A CN 201710140958A CN 108575007 B CN108575007 B CN 108575007B
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/10—Controlling the intensity of the light
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
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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 invention relates to a dimming and brightening processing device of an LED constant current circuit based on an indoor lamp gate control gear, which comprises an input protection circuit, a constant current control circuit, an indoor lamp LED and a gate control input voltage processing circuit, wherein the input protection circuit is connected with the input protection circuit; the input protection circuit is used for processing the interference of the power supply level of the indoor lamp and providing the processed stable level for the constant current control circuit; the constant current control circuit is used for powering the indoor lamp LEDs to be gradually lightened and darkened and the constant current driving to be lightened; the indoor lamp LED is used for reading lamp functions in the vehicle; the gate control input voltage processing circuit is used for processing the gate control level, the gate control level after processing is controlled in the gate control effect, the indoor lamp LED is controlled to be dark when the gate is closed, and the indoor lamp LED is controlled to be bright when the gate is opened. By adopting the arrangement, the LED of the indoor lamp can be driven at constant current and can meet the requirements of gradual brightness and gradual darkness. For the above reasons, the invention can be widely applied to the technical field of automobile indoor lamps.
Description
Technical Field
The invention relates to the technical field of indoor lamps of automobiles, in particular to a dimming and brightening processing device of an LED constant current circuit based on an indoor lamp gate control gear.
Background
In recent years, the LED technology has been rapidly developed, and the LED lighting device has an increasingly wide application range, especially in the field of automotive lighting, due to the advantages of high efficiency, long service life, safety, environmental protection, and the like, and is favored by the industry. Along with the updating of automobiles, not only the types of automobiles are more and more, but also the modeling designs of indoor lamps are various, because the door control function of the indoor lamps needs to be in a gradually dark and bright process when the door is closed and opened, the driving mode of the LEDs of the indoor lamps is limited, and most of the indoor lamps are in a resistor driving mode in the market at present, which is the simplest linear circuit, and the current linearly changes along with the change of voltage. However, as known, the resistance type driving has low driving efficiency, and when the voltage fluctuates, the LEDs of the indoor lamp have brightness change, and the common constant current circuit cannot meet the requirements of gradually lighting and darkness of the indoor lamp because of constant current.
Disclosure of Invention
The invention aims to solve the technical problems that: in order to solve the problems that in the prior art, when a door is closed, dimming is achieved when the door is opened, driving efficiency is low when a common constant current circuit drives an indoor lamp, and voltage fluctuation is not achieved, the invention provides a dimming and dimming processing device of an LED constant current circuit based on an indoor lamp door control gear, and the problem is solved.
The technical scheme adopted for solving the technical problems is as follows: a dimming and brightening processing device of an LED constant current circuit based on an indoor lamp gate control gear is characterized in that: the LED lamp comprises an input protection circuit, a constant current control circuit, an indoor lamp LED and a gate control input voltage processing circuit; wherein the input end of the input protection circuit is connected with an indoor lamp power supply, the output end of the input protection circuit is respectively connected with one input end of the constant current control circuit and the indoor lamp LED, the output end of the gate control input voltage processing circuit is connected with the other input end of the constant current control circuit; the input protection circuit is used for processing electromagnetic interference of an indoor lamp power supply and providing the processed stable level for the constant current control circuit; the constant current control circuit is used for powering the indoor lamp LEDs to be gradually lightened and darkened and the constant current driving to be lightened; the indoor lamp LEDs are used for reading lamp functions in the vehicle; the gating input voltage processing circuit is used for processing gating level, the gating level after processing is controlled in gating action, the indoor lamp LED is controlled to be dark when the door is closed, and the indoor lamp LED is controlled to be bright when the door is opened.
The input protection circuit comprises a first capacitor, a transient suppression diode, a first resistor and a diode; the first capacitor, the transient suppression diode and the first resistor are connected in parallel, the output ends of the first capacitor, the transient suppression diode and the first resistor are grounded together, an EMC protection circuit is formed by the first capacitor, the transient suppression diode and the first resistor, and the input ends of the first capacitor, the transient suppression diode and the first resistor are connected with the anode of the diode; the negative electrode of the diode is respectively connected with the input end of the indoor lamp LE and the input end of the constant current control circuit.
The constant current control circuit comprises a second resistor, a third resistor, a fourth resistor, a second capacitor, a voltage stabilizing diode, a fifth resistor, a third capacitor, an NPN triode, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor and an indoor lamp switch; one end of the second resistor is connected with the cathode of the diode, the other end of the second resistor is connected with the fourth resistor, the second resistor and the fourth resistor are connected in series for voltage division, and the zener diode is connected in parallel with the two ends of the fourth resistor; the second capacitor is connected in parallel with two ends of the zener diode and is used for protecting the zener diode from electromagnetic interference; the negative electrode of the voltage stabilizing diode is connected with one end of the fifth resistor, the other end of the fifth resistor is connected with the base of the NPN triode, and the third capacitor is connected between the base of the NPN triode and the ground in parallel; the emission set of the NPN triode is respectively connected with one ends of the seventh resistor, the eighth resistor, the ninth resistor and the tenth resistor, and the other ends of the seventh resistor, the eighth resistor, the ninth resistor and the tenth resistor are grounded; the collector electrode of the NPN triode is connected with the indoor lamp LED; the indoor lamp switch is arranged between the second resistor and the fourth resistor, the indoor lamp switch comprises a first connecting port, a second connecting port and a third connecting port, the third connecting port is empty, the second connecting port of the indoor lamp switch is connected with the second resistor, and the first connecting port is connected with the fourth resistor; one end of the third resistor is connected with the output end of the gate control input voltage processing circuit, and the other end of the third resistor is connected with one end of the fifth resistor.
The indoor lamp comprises a light emitting diode and a sixth resistor, and the light emitting diode is connected with the sixth resistor in parallel; the output end of the indoor lamp LED is connected with the collector electrode of the NPN triode, and the input end of the indoor lamp LED is connected with the output end of the input protection circuit.
The gating input voltage processing circuit comprises an eleventh resistor, a PNP triode and a twelfth resistor; the base of the PNP triode is connected with one end of the eleventh resistor, and the other end of the eleventh resistor is connected with a gating level; the emitting set of the PNP triode is connected with an indoor lamp power supply; and the collector electrode of the PNP triode is respectively connected with one end of the third resistor and one end of the twelfth resistor, and the other end of the twelfth resistor is grounded.
The invention has the beneficial effects that 1, the invention comprises an input protection circuit, a constant current control circuit, an indoor lamp LED and a gate control input voltage processing circuit; the input protection circuit is used for processing electromagnetic interference of the indoor lamp power supply and providing the processed stable level for the constant current control circuit; the constant current control circuit is used for powering the indoor lamp LEDs to be gradually lightened and darkened and the constant current driving to be lightened; the indoor lamp LED is used for reading lamp functions in the vehicle; the gate control input voltage processing circuit is used for processing the gate control level, the gate control level after processing is controlled in the gate control effect, the indoor lamp LED is controlled to be dark when the gate is closed, and the indoor lamp LED is controlled to be bright when the gate is opened. By adopting the arrangement, the LED of the indoor lamp can be driven at constant current and can meet the requirements of gradual brightness and gradual darkness. 2. Compared with a resistance type driving circuit, the invention has low driving efficiency, most of energy is consumed on a resistor, and current rises with the rising of voltage, and power rises greatly, but a constant current circuit has constant current with the rising of voltage, and power is not as large as that of the resistance type. For the above reasons, the invention can be widely applied to the technical field of automobile indoor lamps.
Drawings
The invention will be further described with reference to the drawings and examples.
FIG. 1 is a schematic diagram of the overall connection structure of the present invention in a gating state;
FIG. 2 is a schematic diagram showing the current change of the LED of the indoor lamp when the door is closed under the door control function;
Fig. 3 is a schematic diagram of a constant current variation circuit of an indoor lamp LED in the non-gating operation of the present invention.
Detailed Description
The invention will now be described in further detail with reference to the accompanying drawings. The drawings are simplified schematic representations which merely illustrate the basic structure of the invention and therefore show only the structures which are relevant to the invention.
As shown in fig. 1, the present invention includes an input protection circuit 100, a constant current control circuit 200, an indoor lamp LED300, and a gate input voltage processing circuit 400.
The input protection circuit 100 has an input terminal connected to the indoor lamp power supply, an output terminal connected to one input terminal of the constant current control circuit 200 and the indoor lamp LED300, and an output terminal of the gate control input voltage processing circuit 400 connected to the other input terminal of the constant current control circuit 200.
The input protection circuit 100 is used for processing electromagnetic interference of an indoor lamp power supply and providing a processed stable level to the constant current control circuit 200; the constant current control circuit 200 is used for powering the indoor lamp LEDs 300 to be gradually lightened and darkened and the constant current driving to be lightened; the indoor lamp LED300 is used for an in-vehicle reading lamp function; the gating input voltage processing circuit 400 is configured to process a gating level, and the processed gating level controls the indoor lamp LED300 to be gradually dark when the door is closed and controls the indoor lamp LED300 to be gradually bright when the door is opened in a gating effect.
The input protection circuit 100 is used for processing interference of an indoor lamp power supply level, an input end of the input protection circuit 100 is connected with the indoor lamp power supply, the indoor lamp power supply level V1 inputs a high level, and the input protection circuit 100 comprises a first capacitor C1, a transient suppression diode T1, a first resistor R1 and a diode D1.
The output ends of the first capacitor C1, the transient suppression diode T1 and the first resistor R1 are commonly grounded, an EMC protection circuit is formed by connecting the first capacitor C1, the transient suppression diode T1 and the first resistor R1 in parallel, and the positive electrode of the diode D1 is connected after passing through the EMC protection circuit. The cathode of the diode D1 is connected to the input terminal of the indoor lamp LED300 and the input terminal of the constant current control circuit 200, respectively.
The input protection circuit 100 may take any other form, and only needs to meet EMC requirements, and only works under the electromagnetic interference condition of the vehicle body, and has no influence on the normal working circuit. And are not limited herein.
The constant current control circuit 200 is configured to supply power to the LED300 for gradually lighting, gradually dimming, and constant current driving, and the constant current control circuit 200 includes a second resistor R2, a third resistor R3, a fourth resistor R4, a second capacitor C2, a zener diode D3, a fifth resistor R5, a third capacitor C3, an NPN triode Q3, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, and an indoor lamp switch SW1.
One end of the second resistor R2 is connected with the cathode of the diode D1, the other end of the second resistor R2 is connected with the fourth resistor R4, the second resistor R2 and the fourth resistor R4 are connected in series for voltage division, and the voltage stabilizing diode D3 is connected in parallel at two ends of the fourth resistor R4; the second capacitor C2 is connected in parallel to two ends of the zener diode D3, and the second capacitor C2 is used for protecting the zener diode D3 from electromagnetic interference. The negative pole of zener diode D3 connects one end of fifth resistance R5, and the other end of fifth resistance R5 connects NPN triode Q3's base, and third electric capacity C3 connects in parallel between NPN triode Q3's base and ground, makes NPN triode Q3 not receive electromagnetic interference. The emission set of the NPN triode Q3 is respectively connected with one ends of a seventh resistor R7, an eighth resistor R8, a ninth resistor R9 and a tenth resistor R10, the other ends of the seventh resistor R7, the eighth resistor R8, the ninth resistor R9 and the tenth resistor R10 are grounded, and the seventh resistor R7, the eighth resistor R8, the ninth resistor R9 and the tenth resistor R10 are power resistors and consume circuit power. The collector of NPN transistor Q3 is connected to room light LED 300.
In the above embodiment, the resistances of the seventh resistor R7, the eighth resistor R8, the ninth resistor R9, and the tenth resistor R10 connected in parallel are sampling resistors, so that the LED current can be adjusted.
The indoor lamp switch SW1 is arranged between the second resistor R2 and the fourth resistor R4, the indoor lamp switch SW1 comprises a first connecting port 1, a second connecting port 2 and a third connecting port 3, the third connecting port 3 is empty, the second connecting port 2 of the indoor lamp switch SW1 is connected with the second resistor R2, and the first connecting port 1 is connected with the fourth resistor R4. When the second connection port 2 and the first connection port 1 are connected, the constant current drive circuit 200 is turned on. When the second connection port 2 and the third connection port 3, the constant current drive circuit is closed.
One end of the third resistor R3 is connected with the output end of the gate control input voltage processing circuit 400, and the other end of the third resistor R3 is connected with one end of the fifth resistor R5.
The indoor lamp LED300 is used for reading lamp functions in a vehicle, and the indoor lamp LED300 comprises a light emitting diode LED1 and a sixth resistor R6, wherein the light emitting diode LED1 is connected in parallel with the sixth resistor R6. The output of the indoor lamp LED300 is connected with the collector electrode of the NPN triode Q3, and the input of the indoor lamp LED300 is connected with the output end of the input protection circuit 100.
The gating input voltage processing circuit 400 is configured to process a gating level V2, and includes an eleventh resistor R11, a PNP transistor Q1, and a twelfth resistor R12.
The base of the PNP triode Q1 is connected with one end of an eleventh resistor R11, and the other end of the eleventh resistor R11 is connected with a gate control level V2; the emitter set of the PNP triode Q1 is connected with the power supply level V1 of the indoor lamp; the collector of the PNP triode Q1 is respectively connected with one end of the third resistor R3 and one end of the twelfth resistor R12, and the other end of the twelfth resistor R12 is grounded.
At the collector P1 point of the PNP transistor Q1, a level inverted from the gating level V2 is obtained:
When the door is opened, the power level V1 of the indoor lamp is changed from high to low, and is kept at low after the door is opened, but the indoor lamp is turned on at this time, so that a high level is needed to turn on the NPN transistor Q3 to control the light emitting diode LED1 in the indoor lamp LED300 to be turned on.
When the door is closed, the power level V1 of the indoor lamp changes from low to high, and after the door is closed, the indoor lamp is kept at high level, but at this time, the indoor lamp is turned off, so that a low level is needed to turn off the NPN transistor Q3 to control the light emitting diode LED1 in the indoor lamp LED300 to be turned off.
The gate input voltage processing circuit 400 can obtain a voltage which is opposite to the input level, and the turn-on and turn-off of the NPN triode Q3 is controlled, so that the light emitting diode LED1 in the indoor lamp LED300 is turned on and off.
The invention works as follows:
(1) When the invention works in the door control state, the second connection port 2 and the third connection port 3 of the indoor lamp switch SW1 are communicated with each other:
11 Door closing) door closing:
The gate level V2 is input by the vehicle body control system (this is the prior art and will not be described in detail), the level is increased from 0V to 13.5V, and the point p1 voltage is calculated by: the voltage of the emitter electrode of the PNP triode Q1 is V1, the voltage of the base electrode is V1-0.7V, the base electrode current is (V1-0.7V-V2)/R11, the collector electrode current is beta (V1-0.7V-V2)/R11, and the voltage of the P1 point is beta (V1-0.7V-V2) R12/R11. Since V1 is constant at 13.5V, the voltage at the P1 point is (12.8V-V2) betaR 12/R11. R12/r11=1/β is set. The voltage at point P1 is then 12.8V-V2. It can be seen that the P1 point voltage increases as V2 decreases and decreases as V2 increases.
The level of P1 is inverted from V2, and the level of P1 is used to control the turn-on and turn-off of NPN transistor Q3, thereby controlling the on and off of light emitting diode LED1 in indoor lamp LED 300.
The resistances of the third resistor R3 and the fourth resistor R4 are set (the setting of the resistances of the third resistor R3 and the fourth resistor R4 is not described in detail herein according to the working experience of the staff), so that the zener diode D3, D3 is a 5.1V zener diode, and is not fully opened, that is, the voltage at two ends of the zener diode D3 is smaller than the regulated voltage by 5.1V, at this time, the voltage and the current at two ends of the zener diode D3 have a curve which is approximately linearly changed, along with the linearly decreasing voltage at point P1, the current at the zener diode D3 gradually decreases, the voltage at the end of the zener diode D3 linearly decreases from 5.1V to 0V, so that the voltage at the end of the NPN transistor Q3 linearly decreases, because the resistance values of the seventh resistor R7, the eighth resistor R8, the ninth resistor R9 and the tenth resistor R10 are fixed, so that the current at the collector of the NPN transistor Q3 gradually decreases, that is the current at the time when the current at the two ends of the zener diode D3 has a section of the curve which is approximately linearly changing, that the current at the point P1, the current LED1 in the room lamp LED300 gradually decreases, as shown in fig. 2, thereby the luminance of the LED1 gradually decreases, and the luminance requirement is satisfied, and the luminance requirement is becomes high, and the luminance, as the light is gradually, and the light is, as is as has, and the light, and as has.
12 Opening door):
When the door is opened, the working process is completely opposite to the state when the door is closed, so that the details are not repeated.
(2) When the indoor lamp switch SW1 is operated in the door control state, the second connection port 2 of the indoor lamp switch SW1 is communicated with the first connection port 1:
At this time, the indoor lamp LED300 is turned on and is driven by a constant current, as shown in fig. 3, because the voltage of the vehicle body is 9-16V, when the voltage of the power supply level V1 of the indoor lamp reaches 9V, the resistance values of the second resistor R2 and the fourth resistor R4 are set (the setting of the resistance values of the second resistor R2 and the fourth resistor R4 is not described in detail herein according to the working experience of the staff), at this time, the voltage on the zener diode D3 reaches 5.1V, because the zener diode D3 reaches a stable voltage, when V1 continues to rise, the voltage of the zener diode D3 is stabilized at 5.1V, so that the base voltage of the NPN triode Q3 is stabilized at 5.1V, and the emitter voltage is Ub-0.7v=5.1V-0.7v=4.4v, i.e. the sampling resistor: the voltages at two ends of the seventh resistor R7, the eighth resistor R8, the ninth resistor R9 and the tenth resistor R10 are stabilized at 4.4V, and the constant current of the current flowing through the seventh resistor R7, the eighth resistor R8, the ninth resistor R9 and the tenth resistor R10 is unchanged, namely the constant current of the emitter, so that the current of the collector of the NPN triode Q3 is constant, namely the current flowing through the light-emitting diode LED1 in the indoor lamp LED300 is constant, and the constant current driving of the light-emitting diode LED1 with 9-16V working voltage is realized.
(3) When the present invention is not operating in the gating state:
When the indoor lamp LED300 does not operate in the gating state, the gating level V2 is suspended, no gating signal is input, and the gating input voltage processing circuit 400 does not operate.
The on and off of the indoor lamp LED300 lamp is controlled by pressing and bouncing the indoor lamp switch SW 1: the indoor lamp switch SW1 is pressed, that is, the second interface 2 of the indoor lamp switch SW1 is connected with the first interface 1, at this time, the indoor lamp LED300 is turned on, and the indoor lamp LED300 is turned on, which is described in detail in the step (2), so that the description is omitted. The indoor lamp switch SW1 is sprung, that is, the second interface 2 of the indoor lamp switch SW1 is connected with the third interface 3, and at this time, the NPN triode Q3 controlling the lighting of the indoor lamp LED300 is not voltage driven, and the indoor lamp LED300 is turned off.
With the above-described preferred embodiments according to the present invention as an illustration, the above-described descriptions can be used by persons skilled in the relevant art to make various changes and modifications without departing from the scope of the technical idea of the present invention. The technical scope of the present invention is not limited to the description, but must be determined according to the scope of claims.
Claims (2)
1. The working method of the dimming and brightening processing device of the LED constant current circuit based on the indoor lamp gate control gear is characterized by comprising the following steps of: the processing device comprises an input protection circuit (100), a constant current control circuit (200), an indoor lamp LED (300) and a gate control input voltage processing circuit (400);
The input end of the input protection circuit (100) is connected with an indoor lamp power supply, the output end of the input protection circuit is respectively connected with one input end of the constant current control circuit (200) and the indoor lamp LEDs (300), and the output end of the gate control input voltage processing circuit (400) is connected with the other input end of the constant current control circuit (200);
The input protection circuit (100) is used for processing electromagnetic interference of an indoor lamp power supply and providing a processed stable level for the constant current control circuit (200); the constant current control circuit (200) is used for powering the indoor lamp LEDs (300) to be gradually lightened, gradually darkened and constant current driving to lighten; the indoor lamp LED (300) is used for an in-car reading lamp function; the gating input voltage processing circuit (400) is used for processing gating level, controlling the gating level after processing to be in gating action, controlling the indoor lamp LED (300) to be dark when the door is closed, and controlling the indoor lamp LED (300) to be bright when the door is opened;
The input protection circuit (100) comprises a first capacitor (C1), a transient suppression diode (T1), a first resistor (R1) and a diode (D1);
The first capacitor (C1), the transient suppression diode (T1) and the first resistor (R1) are connected in parallel, the output ends of the first capacitor, the transient suppression diode (T1) and the first resistor are grounded together to form an EMC protection circuit, and the input ends of the first capacitor, the transient suppression diode (T1) and the first resistor are connected with the positive electrode of the diode (D1); the cathode of the diode (D1) is respectively connected with the input end of the indoor lamp LED (300) and the input end of the constant current control circuit (200);
The constant current control circuit (200) comprises a second resistor (R2), a third resistor (R3), a fourth resistor (R4), a second capacitor (C2), a zener diode (D3), a fifth resistor (R5), a third capacitor (C3), an NPN triode (Q3), a seventh resistor (R7), an eighth resistor (R8), a ninth resistor (R9), a tenth resistor (R10) and an indoor lamp switch (SW 1);
one end of the second resistor (R2) is connected with the cathode of the diode (D1), the other end of the second resistor (R2) is connected with the fourth resistor (R4), the second resistor (R2) and the fourth resistor (R4) are connected in series for voltage division, and the zener diode (D3) is connected in parallel with two ends of the fourth resistor (R4); the second capacitor (C2) is connected in parallel to two ends of the zener diode (D3), and the second capacitor (C2) is used for protecting the zener diode (D3) from electromagnetic interference; the negative electrode of the voltage stabilizing diode (D3) is connected with one end of the fifth resistor (R5), the other end of the fifth resistor (R5) is connected with the base electrode of the NPN triode (Q3), and the third capacitor (C3) is connected between the base electrode of the NPN triode (Q3) and the ground in parallel; the emission set of the NPN triode (Q3) is respectively connected with one end of the seventh resistor (R7), the eighth resistor (R8), the ninth resistor (R9) and one end of the tenth resistor (R10); the other ends of the seventh resistor (R7), the eighth resistor (R8), the ninth resistor (R9) and the tenth resistor (R10) are grounded; the collector electrode of the NPN triode (Q3) is connected with the indoor lamp LED (300); the indoor lamp switch (SW 1) is arranged between the second resistor (R2) and the fourth resistor (R4), the indoor lamp switch (SW 1) comprises a first connecting port (1), a second connecting port (2) and a third connecting port (3), the third connecting port (3) is empty, the second connecting port (2) of the indoor lamp switch (SW 1) is connected with the second resistor (R2), and the first connecting port (1) is connected with the fourth resistor (R4); one end of the third resistor (R3) is connected with the output end of the gate-controlled input voltage processing circuit (400), and the other end of the third resistor (R3) is connected with one end of the fifth resistor (R5);
The indoor lamp LED (300) comprises a light emitting diode (LED 1) and a sixth resistor (R6), wherein the light emitting diode (LED 1) is connected with the sixth resistor (R6) in parallel; the output end of the indoor lamp LED (300) is connected with the collector electrode of the NPN triode (Q3), and the input end of the indoor lamp LED (300) is connected with the output end of the input protection circuit (100);
The working method comprises the following steps:
(1) when the invention works in the door control state, the second connection port (2) and the third connection port (3) of the indoor lamp switch (SW 1) are communicated with each other:
11 Door closing) door closing:
the gate control level (V2) is input by a vehicle body control system, the level is increased from 0V to 13.5V, and the point voltage calculation mode of P1 is as follows: the voltage of the emitter of the PNP triode (Q1) is V1, the voltage of the base is V1-0.7V, the current of the base is (V1-0.7V-V2)/R11, the current of the collector is beta (V1-0.7V-V2)/R11, the voltage of the P1 point is beta (V1-0.7V-V2) R12/R11, because V1 is constant to be 13.5V, the voltage of the P1 point is (12.8V-V2) R12/R11, R12/R11=1/per gram is set, the voltage of the P1 point is 12.8V-V2, when the gate level (V2) is reduced, the voltage of the P1 point is increased, and when the gate level (V2) is increased, the voltage of the P1 point is reduced;
the P1 level is in opposite phase with the gating level (V2), and the level of the P1 point is used for controlling the on and off of an NPN triode (Q3), so that the on and off of a light emitting diode (LED 1) in the indoor lamp LED (300) are controlled;
Setting the resistance values of a third resistor (R3) and a fourth resistor (R4), so that the voltage stabilizing diode (D3) is not fully opened, namely the voltage at two ends of the voltage stabilizing diode (D3) is smaller than the voltage stabilizing voltage by 5.1V, at the moment, the voltage at two ends of the voltage stabilizing diode (D3) and the current have a section of curve which is close to linear change, along with the linear decrease of the voltage at the point P1, the current on the voltage stabilizing diode (D3) is gradually decreased, the voltage at the end of the voltage stabilizing diode (D3) is linearly decreased from 5.1V to 0V, so that the voltage of an emitter of the NPN triode (Q3) is linearly decreased, and because the resistance values of a seventh resistor (R7), an eighth resistor (R8), a ninth resistor (R9) and a tenth resistor (R10) are fixed, the current of the emitter of the NPN triode (Q3) is gradually decreased, so that the current of a collector of the NPN triode (Q3) is gradually decreased, namely the current of a light emitting diode (LED 1) flowing through an indoor lamp linearly decreases, the light emitting diode (LED 1) is gradually decreased, the light emitting diode (1) gradually decreases, and the brightness requirements of customers are satisfied, and high driving efficiency are satisfied;
12 Opening door):
When the door is opened, the working process is completely opposite to the state when the door is closed;
(2) When the indoor lamp switch works in a gating state, the second connection port (2) of the indoor lamp switch (SW 1) is communicated with the first connection port (1):
At this time, the indoor lamp LED (300) is turned on and is driven by a constant current, because the voltage of the vehicle body is 9-16V, when the voltage of the indoor lamp power supply level (V1) reaches 9V, the resistance values of the second resistor (R2) and the fourth resistor (R4) are set, so that the voltage on the zener diode (D3) reaches 5.1V, because the zener diode (D3) reaches a stable voltage, when the indoor lamp power supply level (V1) continues to rise, the voltage of the zener diode (D3) can be stabilized at 5.1V, so that the base voltage of the NPN triode (Q3) is stabilized at 5.1V, and the emitter voltage is Ub-0.7v=5.1V-0.7v=4.4V, namely, the sampling resistor: the voltages at two ends of the seventh resistor (R7), the eighth resistor (R8), the ninth resistor (R9) and the tenth resistor (R10) are stabilized at 4.4V, and the constant current of the current flowing through the seventh resistor (R7), the eighth resistor (R8), the ninth resistor (R9) and the tenth resistor (R10) is unchanged, namely the constant emitter current, so that the collector current of an NPN triode (Q3) is constant, namely the current flowing through a light emitting diode (LED 1) in an indoor lamp LED (300) is constant, and the constant current driving of the light emitting diode (LED 1) with 9-16V working voltage is realized;
(3) When the present invention is not operating in the gating state:
when the indoor lamp LED (300) does not work in a gating state, the gating level (V2) is suspended, no gating signal is input, and the gating input voltage processing circuit (400) does not work;
the on/off of the indoor lamp LED (300) lamp is controlled by pressing and bouncing an indoor lamp switch (SW 1): the indoor lamp switch (SW 1) is pressed down, namely the second connector (2) of indoor lamp switch (SW 1) is connected with first connector (1), and at this moment, indoor lamp LED (300) is opened, and indoor lamp LED (300) is on, and indoor lamp switch (SW 1) pops up, namely the second connector (2) of indoor lamp switch (SW 1) is connected with third connector (3), and at this moment, NPN triode (Q3) that control indoor lamp LED (300) to be on does not have voltage drive, and indoor lamp LED (300) goes out.
2. The method for operating the dimming and brightening processing device of the LED constant current circuit based on the door stop of the indoor lamp according to claim 1, wherein the method comprises the following steps: the gating input voltage processing circuit (400) comprises an eleventh resistor (R11), a PNP triode (Q1) and a twelfth resistor (R12);
The base electrode of the PNP triode (Q1) is connected with one end of the eleventh resistor (R11), and the other end of the eleventh resistor (R11) is connected with a gating level (V2); the emitter of the PNP triode (Q1) is connected with an indoor lamp power supply; the collector of the PNP triode (Q1) is respectively connected with one end of the third resistor (R3) and one end of the twelfth resistor (R12), and the other end of the twelfth resistor (R12) is grounded.
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| CN110225626B (en) * | 2019-07-09 | 2024-03-29 | 深圳南方德尔汽车电子有限公司 | Indoor lamp controller for vehicle and vehicle with indoor lamp controller |
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