CN218587362U - Color temperature adjusting circuit, LED lamp control system and automobile - Google Patents
Color temperature adjusting circuit, LED lamp control system and automobile Download PDFInfo
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- CN218587362U CN218587362U CN202222585012.8U CN202222585012U CN218587362U CN 218587362 U CN218587362 U CN 218587362U CN 202222585012 U CN202222585012 U CN 202222585012U CN 218587362 U CN218587362 U CN 218587362U
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Abstract
The utility model discloses a colour temperature regulating circuit, LED lamp control system and car, wherein colour temperature regulating circuit includes red luminescent circuit, green luminescent circuit and blue luminescent circuit, and the luminescent circuit of each kind of colour all includes: the device comprises a feedback comparison module, an inversion module, a light-emitting module and a voltage following module, wherein the feedback comparison module receives a color input signal and a fourth output signal output by the voltage following module, compares the color input signal with the fourth output signal and outputs a first output signal; the phase inversion module receives the first output signal, inverts the first output signal and outputs a second output signal; the light emitting module receives the second output signal to control the light emitting brightness of the light emitting module and outputs a third output signal; and the voltage following module receives the third output signal and outputs a fourth output signal to be fed back to the feedback comparison module. The utility model discloses can adjust the colour temperature of locomotive LED headlight.
Description
Technical Field
The utility model relates to a vehicle lighting control technical field, in particular to colour temperature regulating circuit, LED lamp control system and car.
Background
Color temperature is the perception of human eyes of luminous or white reflectors, a perception of the complex combination of physics, physiology and psychology. At present, the LED headlamp in front of the existing automobile generally adopts monochromatic warm light, namely, the whole lamp emits light with a color temperature. The higher the color temperature of the front LED headlight is, the higher the frequency of the light is, so that the loss of light wave energy is directly caused to be larger, and the change of the irradiation distance is indirectly caused. Therefore, in order to improve the irradiation distance of the lamp light, the color temperature of the front LED lamp needs to be adjusted.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the problem that the colour temperature of plantago LED headlight can't be adjusted. The utility model provides a colour temperature regulating circuit, LED lamp control system and car can adjust the colour temperature of the headlight of plantago LED.
In order to solve the above technical problem, the utility model discloses an embodiment discloses a colour temperature regulating circuit, including red luminescent circuit, green luminescent circuit and blue luminescent circuit, the luminescent circuit of each kind of colour all includes: a feedback comparison module, an inversion module, a light emitting module and a voltage following module, wherein,
the feedback comparison module is respectively connected with the voltage following module and the phase reversal module, and is used for receiving the color input signal, the voltage output by the voltage following module and a subsequent fourth output signal, and providing a first output signal output after the color input signal and the fourth output signal are compared to the phase reversal module;
the phase inversion module is respectively connected with the feedback comparison module and the light-emitting module and is used for receiving the first output signal output by the feedback comparison module and providing a second output signal output after the first output signal is in phase inversion for the light-emitting module;
the light emitting module is respectively connected with the phase reversal module and the voltage following module and is used for controlling the light emitting brightness of the light emitting module according to the received second output signal and outputting a third output signal to the voltage following module;
the voltage following module is used for receiving a third output signal output by the light-emitting module and providing the third output signal voltage and a fourth output signal output subsequently to the feedback comparison module.
According to another embodiment of the present invention, the feedback comparison module comprises a first operational amplifier, a first resistor, a second resistor, a third resistor, and a fourth resistor, wherein,
one end of the first resistor is used for receiving color input signals, the other end of the first resistor is respectively connected with one end of the second resistor and the inverting input end of the first operational amplifier, and the other end of the second resistor is connected with the output end of the first operational amplifier;
one end of the third resistor is connected with the voltage following module and used for receiving a fourth output signal output by the voltage following module, and the other end of the third resistor is respectively connected with one end of the fourth resistor and the non-inverting input end of the first operational amplifier;
the output end of the first operational amplifier is also connected with the phase inversion module and used for providing a first output signal output after the color input signal and the fourth output signal are compared to the phase inversion module;
the other end of the fourth resistor is connected to the ground terminal.
According to another embodiment of the present invention, the first resistor, the second resistor, the third resistor and the fourth resistor have the same resistance.
According to another embodiment of the present invention, the inverting module comprises a second operational amplifier, a fifth resistor, a sixth resistor and a seventh resistor, wherein,
one end of the fifth resistor is connected with the feedback comparison module and used for receiving the first output signal, the other end of the fifth resistor is connected with one end of the sixth resistor and the inverting input end of the second operational amplifier, and the other end of the sixth resistor is connected with the output end of the second operational amplifier;
one end of the seventh resistor is connected with the non-inverting input end of the second operational amplifier, and the other end of the seventh resistor is connected with the grounding end;
the output end of the second operational amplifier is also connected with the light-emitting module and used for providing a second output signal output after the first output signal is inverted to the light-emitting module.
According to another embodiment of the present invention, the resistances of the fifth resistor, the sixth resistor and the seventh resistor are the same.
According to the utility model discloses a further embodiment, the light emitting module includes triode and emitting diode, and the collecting electrode of triode links to each other with the power, and the base of triode links to each other with the antiphase module for receive the second output signal of antiphase module output, the projecting pole of triode links to each other with emitting diode's input, and emitting diode's output links to each other with voltage following module, is used for providing voltage following module with the third output signal of light emitting module output.
According to the utility model discloses a further embodiment still includes eighth resistance, and the one end of eighth resistance links to each other with emitting diode's output, and the other end links to each other with the earthing terminal.
According to the utility model discloses a further embodiment, the voltage following module includes third operational amplifier, and third operational amplifier's non inverting input end links to each other with the light emitting module for receive the third output signal of light emitting module output, and third operational amplifier's output links to each other with third operational amplifier's inverting input end and feedback comparison module respectively, is used for providing the fourth output signal of third output signal voltage and subsequent output for feedback comparison module.
The utility model discloses an embodiment also discloses a LED lamp control system, include as above colour temperature regulating circuit and the control unit, the control unit links to each other with colour temperature regulating circuit for provide colour input signal for colour temperature regulating circuit, with the colour temperature of adjusting the LED lamp.
According to the utility model discloses a another embodiment still includes digital-to-analog conversion circuit, and digital-to-analog conversion circuit links to each other with the control unit and colour temperature regulating circuit respectively, and digital-to-analog conversion circuit is used for receiving the colour input signal of the control unit output to after being converted colour input signal into analog signal by digital signal, provide the analogue signal after will converting for colour temperature regulating circuit.
The utility model discloses an embodiment also discloses an automobile, including locomotive LED lamp and as above LED lamp control system for adjust the colour temperature of locomotive LED lamp.
Compared with the prior art, the beneficial effects of the utility model reside in that:
the color input signal and a fourth output signal of a third output signal output by the light-emitting module are compared by the feedback comparison module after passing through the voltage following module, and then the first output signal is output, so that the lower-level driving current can be improved, and the driving capability of the lower-level voltage can be improved. The first output signal output by the feedback comparison module passes through the phase inversion module, and the phase inversion module outputs the second output signal after the first output signal is subjected to phase inversion, so that the driving current can be further improved, and the light emitting module can be driven to emit light. And after receiving the second output signal, the light emitting module controls the light emitting brightness of the light emitting module according to the second output signal. After the third output signal output by the light-emitting module passes through the voltage following module, the voltage following module outputs a fourth output signal with the same voltage value as the third output signal so as to improve the lower-stage driving current. The fourth output signal output by the voltage following module is fed back to the feedback comparison module, and is compared with the input color input signal to determine and control the next light-emitting brightness of the light-emitting module, so that the light-emitting brightness of the light-emitting module can change along with the change of the input voltage of the input color input signal. The light emitting brightness of the red, green and blue three-primary-color light sources is respectively controlled by controlling the input voltage, so that the color temperature can be adjusted by mixing red light, green light and blue light. Therefore, the color temperature adjusting circuit, the LED lamp control system and the automobile can adjust the color temperature of the light source by directly controlling the voltage, can realize more accurate adjustment, and has fluency.
Drawings
Fig. 1 is a schematic structural diagram of a red light emitting circuit in a color temperature adjusting circuit according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a green light emitting circuit in a color temperature adjusting circuit according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a blue light emitting circuit in a color temperature adjusting circuit according to an embodiment of the present invention;
fig. 4 is a schematic diagram illustrating a specific structure of an analog-to-digital conversion circuit according to an embodiment of the present invention;
fig. 5 is a schematic diagram illustrating a specific structure of a digital-to-analog conversion circuit according to an embodiment of the present invention.
Detailed Description
The following description is given for illustrative embodiments of the invention, and other advantages and effects of the invention will be apparent to those skilled in the art from the disclosure of the present invention. While the invention will be described in conjunction with the preferred embodiments, it is not intended to limit the features of the invention to that embodiment. On the contrary, the intention of implementing the novel features described in connection with the embodiments is to cover alternatives or modifications as may be included in the appended claims. In the following description, numerous specific details are included to provide a thorough understanding of the invention. The invention may be practiced without these particulars. Furthermore, some of the specific details are omitted from the description so as not to obscure or obscure the present invention. It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.
It should be noted that in this specification, like reference numerals and letters refer to like items in the following drawings, and thus, once an item is defined in one drawing, it need not be further defined and explained in subsequent drawings.
The terms "first," "second," "third," "fourth," "fifth," "sixth," "seventh," "eighth," and the like are used solely to distinguish one from another as to whether relative importance is indicated or implied.
In the description of the present embodiment, it should be further noted that, unless explicitly stated or limited otherwise, the terms "disposed," "connected," and "connected" are to be interpreted broadly, e.g., as a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present embodiment can be understood in specific cases by those of ordinary skill in the art.
In order to make the objects, technical solutions and advantages of the present invention clearer, embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
As shown in fig. 1 to 3, fig. 1 to 3 are schematic circuit structures of a red light emitting circuit, a green light emitting circuit and a blue light emitting circuit in a color temperature adjusting circuit, respectively. The light source of the red light emitting circuit emits red light, the light source of the green light emitting circuit emits green light, and the light source of the blue light emitting circuit emits blue light.
In this embodiment mode, the color input signal includes a red light emission signal, a green light emission signal, or a blue light emission signal. The light emitting signals of the respective colors are connected to the corresponding light emitting circuits. Since the circuit structures of the light emitting circuits of the respective colors are the same, and only the color input signals are different, and the input signals of different colors are respectively connected to the light emitting circuits of the corresponding colors, the circuit structure of the light emitting circuit of the red color is taken as an example in the present embodiment, and the circuit structure descriptions of the light emitting circuits of the green color and the blue color are omitted.
In this embodiment, as shown in fig. 1, the red light emitting circuit includes: a feedback comparison module 1, an inversion module 2, a light emitting module 3 and a voltage following module 4, wherein,
the feedback comparison module 1 is respectively connected with the voltage following module 4 and the phase reversal module 2, and is used for receiving the color input signal, the voltage output by the voltage following module 4 and a subsequent fourth output signal, and providing a first output signal output after the color input signal and the fourth output signal are compared to the phase reversal module 2;
the phase inversion module 2 is respectively connected with the feedback comparison module 1 and the light emitting module 3, and is configured to receive a first output signal output by the feedback comparison module 1, and provide a second output signal output after the phase inversion of the first output signal to the light emitting module 3;
the light emitting module 3 is respectively connected with the phase inverting module 2 and the voltage following module 4, and is used for controlling the light emitting brightness of the light emitting module 3 according to the received second output signal and outputting a third output signal to the voltage following module 4;
the voltage following module 4 is configured to receive the third output signal output by the light emitting module 3, and provide the third output signal voltage and a fourth output signal output subsequently to the feedback comparing module 1.
The feedback comparison module 1 compares the color input signal with a fourth output signal of a third signal output by the light-emitting module 3 after passing through the voltage following module 4, and outputs a first output signal, so that the drive current of a next stage can be improved, and the drive capability of a next stage voltage can be improved. The first output signal output by the feedback comparison module 1 passes through the phase inversion module 2, and after the first output signal is subjected to phase inversion, the phase inversion module 2 outputs a second output signal, so that the driving current can be further increased, and the light-emitting module 3 can be driven to emit light. After receiving the second output signal, the light emitting module 3 controls the light emitting brightness of the light emitting module 3 according to the second output signal. After the third output signal output by the light emitting module 3 passes through the voltage following module 4, the voltage following module 4 outputs a fourth output signal having the same voltage value as the third output signal, so as to improve the lower-stage driving current. The fourth output signal output by the voltage following module 4 is fed back to the feedback comparing module 1, and after being compared with the input color input signal, the fourth output signal determines to control the next light-emitting brightness of the light-emitting module 3, so that the light-emitting brightness of the light-emitting module 3 can change along with the change of the input voltage of the input color input signal. The luminance of the red, green and blue tricolor light sources is controlled by controlling the input voltage, so that the color temperature can be adjusted by mixing red light, green light and blue light. Therefore, the color temperature adjusting circuit adjusts the color temperature of the light source by directly controlling the voltage, can realize more accurate adjustment and has fluency.
Further, the feedback comparison module 1 comprises a first operational amplifier, a first resistor R18, a second resistor R10, a third resistor R14 and a fourth resistor R20, wherein
One end of the first resistor R18 is used for receiving color input signals, the other end of the first resistor R18 is respectively connected with one end of the second resistor R10 and the inverting input end of the first operational amplifier, and the other end of the second resistor R10 is connected with the output end of the first operational amplifier;
one end of the third resistor R14 is connected to the voltage following module 4, and is configured to receive a fourth output signal output by the voltage following module 4, and the other end of the third resistor R14 is connected to one end of the fourth resistor R20 and the non-inverting input terminal of the first operational amplifier, respectively;
the output end of the first operational amplifier is also connected with the phase inversion module 2 and used for providing a first output signal output after comparing the color input signal with the fourth output signal to the phase inversion module 2;
the other end of the fourth resistor R20 is connected to the ground terminal.
Further, in the present embodiment, the first resistor R18, the second resistor R10, the third resistor R14, and the fourth resistor R20 may all have the same resistance value.
Specifically, in fig. 1, pins 2, 3, and 1 of the chip U4 are the non-inverting input terminal, the inverting input terminal, and the output terminal of the first operational amplifier, respectively.
In this embodiment, the first to R18 fourth resistors R20 and the first operational amplifier constitute a differential amplifier circuit. The input signal at the inverting input terminal of the first operational amplifier is a color input signal, the non-inverting input terminal of the first operational amplifier is a fourth output signal output by the voltage following module 4, and since the resistances of the first resistor R18 to the fourth resistor R20 are all the same, the voltage at the output terminal of the first operational amplifier is the difference between the voltage at the non-inverting input terminal and the voltage at the inverting input terminal, that is, the difference is the color input signal
V 1out ＝V 2out –V in ，
Wherein, V 1out Voltage, V, representative of the first output signal output by the feedback comparison module 1 2out Voltage, V, representing the fourth output signal output by the voltage follower module 4 in Representing the voltage of the color input signal.
By adopting the technical scheme, the color input signal can improve the lower-stage driving current and the output capacity of the lower-stage voltage after passing through the first operational amplifier.
Further, in the present embodiment, the inverting module 2 includes a second operational amplifier, a fifth resistor R11, a sixth resistor R16 and a seventh resistor R22, wherein
One end of a fifth resistor R11 is connected with the feedback comparison module 1 and used for receiving the first output signal, the other end of the fifth resistor R11 is connected with one end of a sixth resistor R16 and the inverting input end of the second operational amplifier, and the other end of the sixth resistor R16 is connected with the output end of the second operational amplifier;
one end of the seventh resistor R22 is connected with the non-inverting input end of the second operational amplifier, and the other end is connected with the grounding end;
the output end of the second operational amplifier is further connected to the light emitting module 3, and is configured to provide the second output signal, which is output after the phase of the first output signal is inverted, to the light emitting module 3.
Further, in the present embodiment, the resistance values of the fifth resistor R11, the sixth resistor R16, and the seventh resistor R22 may all be the same.
Specifically, in fig. 1, pins 10, 9, and 8 of the chip U4 are the non-inverting input terminal, the inverting input terminal, and the output terminal of the second operational amplifier, respectively.
Specifically, since the resistances of the fifth resistor R11 to the seventh resistor R22 are all the same, the fifth resistor R11, the sixth resistor R16, the seventh resistor R22 and the second operational amplifier constitute an inverting circuit, and a voltage signal input from the inverting input terminal of the second operational amplifier passes through the second operational amplifier to output a second output signal having the same magnitude and the opposite direction to the input voltage at the inverting input terminal, that is, the second output signal is output
V 3out ＝-V 1out ，
Wherein, V 3out Representing the voltage of the second output signal output by the inverter module 2.
Further, in this embodiment, the light emitting module 3 includes a transistor Q2 and a light emitting diode D4, a collector of the transistor Q2 is connected to the power supply, a base of the transistor Q2 is connected to the inverting module 2 for receiving the second output signal output by the inverting module 2, an emitter of the transistor Q2 is connected to an input of the light emitting diode D4, and an output of the light emitting diode D4 is connected to the voltage following module 4 for providing the third output signal output by the light emitting module 3 to the voltage following module 4.
Specifically, the base of the transistor Q2 receives the second output signal output by the inverting module 2, and when the voltage of the second output signal is greater than the turn-on voltage of the transistor Q2, the transistor Q2 is turned on, so that a current flows out from the emitter of the transistor Q2 and flows to the input of the light emitting diode D4, thereby causing the light emitting diode D4 to emit light. The light emitting diode D4 emits red light as a red light source in the red light emitting circuit. Therefore, the light emitting brightness of the light emitting diode D4 can be adjusted according to the magnitude of the voltage of the second output signal. The voltage output by the led D4 is a third output signal.
Since the resistances of the transistor Q2 and the led D4 can be almost omitted, the output voltage of the led D4 is:
V LED_out ＝V 3out ，
wherein, V LED_out Representing the voltage of the third output signal output by the light emitting module 3.
Further, in this embodiment, the led lighting device further includes an eighth resistor R24, one end of the eighth resistor R24 is connected to the output end of the led D4, and the other end is connected to the ground end.
By adopting the technical scheme, one end of the eighth resistor R24 is connected with the output end of the light-emitting diode D4, the voltage value of the end is the same as that of the output end of the light-emitting diode D4, in addition, the other end of the eighth resistor R24 is connected with the grounding end, so that the two ends of the eighth resistor R24 can be connected into a voltmeter, and the voltage output by the light-emitting diode D4 can be monitored by measuring the voltage at the two ends of the eighth resistor R24.
Further, in the present embodiment, the voltage follower module 4 includes a third operational amplifier, a non-inverting input terminal of the third operational amplifier is connected to the light emitting module 3 for receiving a third output signal output by the light emitting module 3, and output terminals of the third operational amplifier are respectively connected to an inverting input terminal of the third operational amplifier and the feedback comparator module 1 for providing a fourth output signal voltage and a fourth output signal output subsequently to the third operational amplifier to the feedback comparator module 1.
Specifically, in fig. 1, pins 5, 6, and 7 of the chip U4 are the non-inverting input terminal, the inverting input terminal, and the output terminal of the third operational amplifier, respectively.
Since the output terminal of the third operational amplifier is directly connected to the inverting input terminal, a voltage follower circuit is formed, and therefore the voltage of the fourth output signal output from the output terminal of the third operational amplifier is the same as the voltage of the third input signal received at the non-inverting input terminal, that is, the voltage of the third input signal is received at the non-inverting input terminal, that is, the output terminal of the third operational amplifier is directly connected to the inverting input terminal
V 2out ＝V LED_out ，
Wherein, V 2out Representing the voltage of the fourth output signal output by the voltage follower module 4.
By combining the above formulas, the following can be calculated:
V in ＝1/2V LED_out 。
it can be seen from the above formula that the voltage of the color input signal affects the base voltage of the transistor Q2, and further affects the output current of the transistor Q2, and the output current of the transistor Q2 affects the luminance of the led D4, and in turn affects the input voltage fed back to the feedback comparison module 1, so that the purpose that the luminance of the led D4 follows the input voltage is achieved.
In practical applications, specific values of the resistances of the resistors may be designed and determined according to practical application environments, and are not limited herein.
It should be noted that, in other embodiments, the resistances of the resistors of the feedback comparison module 1 and the resistances of the resistors of the inversion module 2 may be different, which is not limited by the present invention, as long as the voltage value V of the third output signal outputted by the light emitting module 3 LED_out Voltage value V of color input signal in In a proportional relationship, e.g. V LED_out And V in The ratio of (1).
The utility model provides a color temperature regulating circuit's theory of operation: the red light-emitting signal is connected into the red light-emitting circuit. The red light-emitting signal is input to the feedback comparison module 1, wherein the feedback comparison module 1 includes a first resistor R18 to a fourth resistor R20 and a first operational amplifier, an inverting input terminal of the first operational amplifier receives the red light-emitting signal, a non-inverting input terminal of the first operational amplifier receives a fourth output signal output by the voltage follower module 4, the first operational amplifier compares the red light-emitting signal with the fourth output signal and outputs a first output signal, and a voltage of the first output signal is a difference between a voltage of the fourth output signal and a voltage of the color input signal. The feedback comparison module 1 provides the first output signal to the inversion module 2.
The inverting module 2 includes fifth to seventh resistors R11 to R22 and a second operational amplifier, an inverting input terminal of the second operational amplifier receives the first output signal, the second operational amplifier inverts the first output signal and outputs a second output signal, and a voltage of the second output signal is a negative voltage of the first output signal. The inverting module 2 provides the second output signal to the light emitting module 3.
The light emitting module 3 includes a transistor Q2 and a light emitting diode D4, and a base of the transistor Q2 receives the second output signal to turn on the transistor Q2, and controls an output current of the transistor Q2 according to a voltage of the second output signal, so that a brightness of the light emitting diode D4 can be controlled. The light emitting module 3 provides the third output signal output from the output terminal of the light emitting diode D4 to the voltage following module 4.
The voltage follower module 4 includes a third operational amplifier, a non-inverting input terminal of the third operational amplifier receives the third output signal output by the light emitting module 3, and an output terminal of the third operational amplifier is connected to an inverting input terminal, so as to output a fourth output signal identical to the third output signal, thereby improving the driving capability.
The fourth output signal output by the voltage following module 4 is fed back to the feedback comparison module 1, so that the output voltage of the feedback comparison module 1 in the next period is influenced, and the purpose of following the input voltage is achieved.
The light emitting brightness of the light sources of the red light emitting circuit, the green light emitting circuit and the blue light emitting circuit is controlled according to the input voltage change of the red light emitting circuit, the green light emitting circuit and the blue light emitting circuit, so that the color temperature is adjusted by mixing red light, green light and blue light, and the color temperature adjusting mode has fluency.
The utility model discloses an embodiment also discloses a LED lamp control system, include as above colour temperature regulating circuit and the control unit, the control unit links to each other with colour temperature regulating circuit for provide colour input signal for colour temperature regulating circuit, with the colour temperature of adjusting the LED lamp.
The color temperature adjusting circuit is used for adjusting the color temperature of the color image, and the color temperature adjusting circuit is used for adjusting the color temperature of the color image.
Specifically, in the present embodiment, as shown in fig. 4 and 5, fig. 4 and 5 are analog-to-digital conversion circuits of a red light emission signal, a green light emission signal, and a blue light emission signal, respectively. The input end of the analog-to-digital conversion circuit is connected with the control unit and used for respectively converting analog signals of the red light-emitting signal, the green light-emitting signal and the blue light-emitting signal which are sent by the control unit into digital signals, and the converted digital signals are used as color input signals of the color temperature adjusting circuit and are respectively connected with the light-emitting circuits with corresponding colors.
In fig. 4 and 5, the digital signals of the Red light-emitting signal, the Green light-emitting signal, and the Blue light-emitting signal output by the digital-to-analog conversion circuit are Red D/a, green D/a, and Blue D/a, respectively. The Red D/a, green D/a and Blue D/a signals outputted in fig. 4 are connected to the light emitting circuits of the corresponding colors as the color input signals in fig. 1, 2 and 3, respectively, that is, to one end of the first resistor of the feedback comparison module.
The utility model discloses an embodiment also discloses an automobile, including locomotive LED lamp and as above LED lamp control system for adjust the colour temperature of locomotive LED lamp.
The utility model provides a colour temperature regulating circuit, LED lamp control system and car, wherein colour temperature regulating circuit includes red luminescent circuit, green luminescent circuit and blue luminescent circuit, and the luminescent circuit of each kind of colour all includes: the device comprises a feedback comparison module, an inversion module, a light-emitting module and a voltage following module, wherein the feedback comparison module receives a color input signal and a fourth output signal output by the voltage following module, compares the color input signal with the fourth output signal and outputs a first output signal; the phase inversion module receives the first output signal, inverts the first output signal and outputs a second output signal; the light emitting module receives the second output signal to control the light emitting brightness of the light emitting module and outputs a third output signal; the voltage following module receives the third output signal and outputs a fourth output signal to be fed back to the feedback comparison module. The utility model discloses can adjust the colour temperature of plantago LED headlight.
While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that the foregoing is a more detailed description of the invention, and the specific embodiments thereof are not to be considered as limiting. Various changes in form and detail, including simple deductions or substitutions, may be made by those skilled in the art without departing from the spirit and scope of the invention.
Claims (11)
1. A color temperature adjusting circuit comprising a red light emitting circuit, a green light emitting circuit, and a blue light emitting circuit, wherein the light emitting circuit of each color comprises: a feedback comparison module, an inversion module, a light emitting module and a voltage following module, wherein,
the feedback comparison module is respectively connected with the voltage following module and the phase inversion module, and is used for receiving a color input signal, a voltage output by the voltage following module and a subsequent fourth output signal, and providing a first output signal output after the color input signal and the fourth output signal are compared to the phase inversion module;
the inverting module is respectively connected with the feedback comparison module and the light-emitting module, and is used for receiving the first output signal output by the feedback comparison module and providing a second output signal output by the inverted first output signal to the light-emitting module;
the light-emitting module is respectively connected with the phase reversal module and the voltage following module, and is used for controlling the light-emitting brightness of the light-emitting module according to the received second output signal and outputting a third output signal to the voltage following module;
the voltage following module is used for receiving the third output signal output by the light-emitting module and providing the third output signal voltage and the fourth output signal output subsequently to the feedback comparison module.
2. The color temperature adjustment circuit of claim 1, wherein the feedback comparison module comprises a first operational amplifier, a first resistor, a second resistor, a third resistor, and a fourth resistor, wherein,
one end of the first resistor is used for receiving the color input signal, the other end of the first resistor is respectively connected with one end of the second resistor and the inverting input end of the first operational amplifier, and the other end of the second resistor is connected with the output end of the first operational amplifier;
one end of the third resistor is connected with the voltage following module and used for receiving the fourth output signal output by the voltage following module, and the other end of the third resistor is respectively connected with one end of the fourth resistor and the non-inverting input end of the first operational amplifier;
the output end of the first operational amplifier is further connected with the inverting module, and is used for providing the first output signal output after the color input signal and the fourth output signal are compared to the inverting module;
and the other end of the fourth resistor is connected with a grounding end.
3. The color temperature adjusting circuit of claim 2, wherein the first resistor, the second resistor, the third resistor and the fourth resistor have the same resistance.
4. The color temperature adjusting circuit of claim 1, wherein the inverting module comprises a second operational amplifier, a fifth resistor, a sixth resistor, and a seventh resistor, wherein,
one end of the fifth resistor is connected with the feedback comparison module and used for receiving the first output signal, the other end of the fifth resistor is connected with one end of the sixth resistor and the inverting input end of the second operational amplifier, and the other end of the sixth resistor is connected with the output end of the second operational amplifier;
one end of the seventh resistor is connected with the non-inverting input end of the second operational amplifier, and the other end of the seventh resistor is connected with the grounding end;
the output end of the second operational amplifier is further connected with the light-emitting module, and is used for providing the second output signal output after the first output signal is inverted to the light-emitting module.
5. The color temperature adjusting circuit of claim 4, wherein the fifth resistor, the sixth resistor and the seventh resistor have the same resistance.
6. The color temperature adjusting circuit according to claim 1, wherein the light emitting module comprises a transistor and a light emitting diode, a collector of the transistor is connected to a power supply, a base of the transistor is connected to the inverting module for receiving the second output signal outputted by the inverting module, an emitter of the transistor is connected to an input terminal of the light emitting diode, and an output terminal of the light emitting diode is connected to the voltage following module for providing the third output signal outputted by the light emitting module to the voltage following module.
7. The color temperature adjusting circuit of claim 6, further comprising an eighth resistor, wherein one end of the eighth resistor is connected to the output terminal of the light emitting diode, and the other end of the eighth resistor is connected to the ground terminal.
8. The color temperature adjusting circuit of claim 1, wherein the voltage follower module comprises a third operational amplifier, a non-inverting input terminal of the third operational amplifier is connected to the light emitting module for receiving the third output signal outputted from the light emitting module, and output terminals of the third operational amplifier are respectively connected to an inverting input terminal of the third operational amplifier and the feedback comparison module for providing the third output signal voltage and the fourth output signal outputted subsequently to the feedback comparison module.
9. An LED lamp control system comprising the color temperature adjusting circuit according to any one of claims 1-8 and a control unit connected to the color temperature adjusting circuit for providing a color input signal to the color temperature adjusting circuit for adjusting the color temperature of the LED lamp.
10. The LED lamp control system of claim 9, further comprising a digital-to-analog conversion circuit, wherein the digital-to-analog conversion circuit is respectively connected to the control unit and the color temperature adjustment circuit, and the digital-to-analog conversion circuit is configured to receive the color input signal output by the control unit, convert the color input signal from a digital signal to an analog signal, and provide the converted analog signal to the color temperature adjustment circuit.
11. An automobile comprising a head LED lamp and an LED lamp control system according to claim 9 or 10 for adjusting the color temperature of the head LED lamp.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222585012.8U CN218587362U (en) | 2022-09-28 | 2022-09-28 | Color temperature adjusting circuit, LED lamp control system and automobile |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222585012.8U CN218587362U (en) | 2022-09-28 | 2022-09-28 | Color temperature adjusting circuit, LED lamp control system and automobile |
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| Publication Number | Publication Date |
|---|---|
| CN218587362U true CN218587362U (en) | 2023-03-07 |
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| CN202222585012.8U Active CN218587362U (en) | 2022-09-28 | 2022-09-28 | Color temperature adjusting circuit, LED lamp control system and automobile |
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| Country | Link |
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| CN (1) | CN218587362U (en) |
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