CN109688663B - Color temperature adjusting circuit, circuit board and teaching all-in-one machine - Google Patents

Color temperature adjusting circuit, circuit board and teaching all-in-one machine Download PDF

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Publication number
CN109688663B
CN109688663B CN201910068699.8A CN201910068699A CN109688663B CN 109688663 B CN109688663 B CN 109688663B CN 201910068699 A CN201910068699 A CN 201910068699A CN 109688663 B CN109688663 B CN 109688663B
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circuit
resistor
switch
light bar
switching
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CN109688663A (en
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张志城
周小燕
何利民
郭腾跃
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Shenzhen Sct Optronics Co ltd
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Shenzhen Sct Optronics Co ltd
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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]
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
    • G09B23/00—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes
    • G09B23/06—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics
    • G09B23/18—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics for electricity or magnetism
    • G09B23/183—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics for electricity or magnetism for circuits
    • 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]

Abstract

The invention discloses a color temperature adjusting circuit, a circuit board and a teaching all-in-one machine. The color temperature adjusting circuit includes: the LED lamp comprises a main control circuit, a switching control circuit, a normal lamp bar circuit and a low blue lamp bar circuit; the master control circuit is connected with the switching control circuit and used for sending a switching control signal to the switching control circuit; the switching control circuit is connected with the main control circuit, the normal light bar circuit and the low blue light bar circuit and used for receiving the switching control signal, and the switching control circuit is configured to control the light bars of the low blue light bar circuit to shine when the teaching all-in-one machine is just powered on; when the teaching all-in-one machine normally operates, the lamp strip switched to the normal lamp strip circuit shines. According to the invention, the effect of automatically entering the eye protection mode under the condition of software failure is realized through the software control mode of one group of the lamp bead group with the reduced color temperature and the other group of the lamp bead group with the standard color temperature in the luminous sources.

Description

Color temperature adjusting circuit, circuit board and teaching all-in-one machine
Technical Field
The embodiment of the invention relates to the field of teaching all-in-one machines, in particular to a color temperature adjusting circuit, a circuit board and a teaching all-in-one machine.
Background
The eye protection mode of the teaching all-in-one machine on the market is mostly realized by modifying the display effect or adjusting the switch of liquid crystal molecules. The display effect is modified mainly by adjusting the whole color in a software mode, so that the color can simulate warm color, and the blue color temperature in the original image is reduced.
The eye protection mode realized by software only processes the intensity of blue light from the surface, and the blue light cannot be directly controlled from the light source, so that the existing technology is only a solution for treating symptoms and not root causes. Once the software fails or the adjusting reference and the liquid crystal glass cannot achieve the effect, the effect of the eye protection mode is lost.
Disclosure of Invention
The invention provides a color temperature adjusting circuit, a circuit board and a teaching all-in-one machine, which are used for achieving the effect of automatically entering an eye protection mode under the condition that software fails.
In a first aspect, an embodiment of the present invention provides a color temperature adjustment circuit, including: the LED lamp comprises a main control circuit, a switching control circuit, a normal lamp bar circuit and a low blue lamp bar circuit; the master control circuit is connected with the switching control circuit and used for sending a switching control signal to the switching control circuit; the switching control circuit is connected with the main control circuit, the normal light bar circuit and the low blue light bar circuit and used for receiving the switching control signal, and the switching control circuit is configured to control the light bars of the low blue light bar circuit to shine when the teaching all-in-one machine is just powered on; when the teaching all-in-one machine normally operates, the lamp strip switched to the normal lamp strip circuit shines.
Optionally, the switching control circuit is further configured to switch the light bar of the low blue light bar circuit to illuminate when software of the teaching all-in-one machine fails.
Optionally, the switching control circuit includes a first switch circuit, a second switch circuit, and a third switch circuit;
the first switch circuit is connected with the main control circuit, the second switch circuit and the third switch circuit, and is configured to receive a first control signal of the main control circuit, send a second control signal to the second switch circuit according to the first control signal, and send a third control signal to the third switch circuit according to the first control signal;
the second switch circuit is connected with the first switch circuit and the normal light bar circuit, and is configured to receive the second control signal and control the on and off of the normal light bar circuit according to the second control signal;
the third switch circuit is connected with the first switch circuit and the low blue light bar circuit, and is configured to receive the third control signal and control the on and off of the low blue light bar circuit according to the third control signal.
Optionally, the first switch circuit includes a second switch tube (Q2), a third switch tube (Q3), a fourth resistor (R4), a fifth resistor (R5), and a sixth resistor (R6);
the base electrode of the third switching tube (Q3) is connected with one end of a sixth resistor (R6), the collector electrode of the third switching tube (Q3) is connected with one ends of a fourth resistor (R4) and a fifth resistor (R5), and the emitter electrode of the third switching tube (Q3) is grounded; the other end of the sixth resistor (R6) is connected with the main control circuit through an interface LED _ ON/OFF, the other end of the fourth resistor (R4) is connected with a power supply with 5V voltage, and the other end of the fifth resistor (R5) is connected with the base electrode of the second switching tube (Q2); the emitter of the second switching tube (Q2) is grounded; the collector of the second switching tube (Q2) is connected with the second switching circuit and the third switching circuit.
Optionally, the second switch circuit includes a first switch tube (Q1), a second resistor (R2), a third resistor (R3), a sixth capacitor (C6), and a seventh capacitor (C7);
wherein one end of a second resistor (R2) and one end of a third resistor (R3) are connected with the first switch circuit; the other end of the second resistor (R2) is connected with an LED _ POWER POWER supply, the LED _ POWER POWER supply is grounded through a sixth capacitor (C6), the other end of the third resistor (R3) is connected with the grid electrode of the first switch tube (Q1), the other end of the third resistor (R3) is connected with the source electrode of the first switch tube (Q1) through a seventh capacitor (C7), the source electrode of the first switch tube Q1 is connected with the LED _ POWER POWER supply, and the drain electrode of the first switch tube (Q1) is connected with the normal light bar circuit through an interface LED _ POWER _ OUT.
Optionally, the third switching circuit includes a fourth switching tube (Q4), a fifth switching tube (Q5), a seventh diode (D7), an eighth diode (D8), a seventh resistor (R7), an eighth resistor (R8), a ninth resistor (R9), a tenth resistor (R10), and an eighth capacitor (C8);
one end of a cathode of the seventh diode (D7) is connected with the first switch circuit, and the anode of the other end of the seventh diode (D7) is connected with one end of the seventh resistor (R7) and one end of the eighth resistor (R8); the other end of the seventh resistor (R7) is connected with a power supply with 5V voltage, and the other end of the eighth resistor (R8) is connected with the base electrode of the fourth switching tube (Q4); a collector of the fourth switching tube (Q4) is connected with one end of a ninth resistor (R9) and one end of a tenth resistor (R10), an emitter of the fourth switching tube is connected with a positive electrode of an eighth diode (D8), and a negative electrode of the eighth diode (D8) is grounded; the other end of the tenth resistor (R10) is connected with the LED _ POWER POWER supply, the other end of the ninth resistor (R9) is connected with the grid electrode of the fifth switch tube (Q5), the other end of the ninth resistor (R9) is connected with the source electrode of the first switch tube (Q5) through the eighth capacitor (C8), the source electrode of the fifth switch tube (Q5) and the other end of the eighth capacitor (C8) are connected with the LED _ POWER POWER supply, and the drain electrode of the fifth switch tube (Q5) is connected with the low-blue light bar circuit through an interface LED _ POWER _ IN.
Optionally, the color temperature adjusting circuit further includes an adjusting control circuit;
the main control circuit is connected with the regulation control circuit and used for sending a regulation control signal to the regulation control circuit;
the adjusting control circuit is connected with the main control circuit, the normal light bar circuit and the low blue light bar circuit, and is used for receiving the adjusting control signal and adjusting the color temperature of the light bars of the normal light bar circuit and the low blue light bar circuit according to the adjusting control signal;
optionally, the switching control circuit is further configured to switch the light bar of the low blue light bar circuit to illuminate when the user switches the eye protection mode.
In a second aspect, an embodiment of the present invention provides a circuit board, including the color temperature adjusting circuit provided in any one of the first aspect.
In a third aspect, an embodiment of the present invention provides a teaching all-in-one machine, including the circuit board provided in the second aspect.
According to the invention, through the software control mode of one group of the lamp bead groups with the reduced color temperature and the other group of the lamp bead groups with the standard color temperature in the luminous sources, when the software control fails, the software control is automatically converted into hardware control, and the lamp bead groups with the reduced color temperature are controlled by default, so that the effect of entering an eye protection mode is realized.
Drawings
FIG. 1 is a schematic block diagram of a color temperature adjustment circuit according to a first embodiment of the present invention;
fig. 2 is a schematic circuit diagram of a main control circuit of a color temperature adjustment circuit according to a first embodiment of the invention;
FIG. 3 is a schematic circuit diagram of a switching control circuit of the color temperature adjustment circuit according to a first embodiment of the present invention;
FIG. 4 is a schematic circuit diagram of a low-blue light bar circuit of a color temperature adjusting circuit according to a first embodiment of the invention;
fig. 5 is a schematic circuit diagram of a normal lamp strip circuit of a color temperature adjustment circuit according to a first embodiment of the invention;
fig. 6 is a schematic circuit diagram of an adjustment control circuit of a color temperature adjustment circuit according to a first embodiment of the invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Example one
Fig. 1 is a schematic block diagram of a color temperature adjusting circuit according to an embodiment of the present invention. The color temperature adjusting circuit includes a main control circuit 110, a switching control circuit 120, a normal light bar circuit 130, and a low blue light bar circuit 140. The main control circuit 110 is connected to the switching control circuit 120, and configured to send a switching control signal to the switching control circuit 120; the switching control circuit 120 is connected to the main control circuit 110, the normal light bar circuit 130, and the low blue light bar circuit 140, and is configured to receive a switching control signal, and the switching control circuit 120 is configured to control the light bars of the low blue light bar circuit 140 to illuminate when the teaching all-in-one machine is powered on; when the teaching all-in-one machine normally operates, the lamp strip switched to the normal lamp strip circuit 130 shines.
Specifically, as shown in fig. 2, the main control circuit 110 includes a main control chip U1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, and a first clock Y1.
The 5 th pin OSC _ IN and the 6 th pin OSC _ OUT of the main control chip U1 are connected to two ends of the first clock Y1; the 5 th pin OSC _ IN is grounded through the third capacitor C3, and the 6 th pin OSC _ OUT is grounded through the second capacitor C2. The 8 th pin VSSA of the main control chip U1 is grounded, the 14 th pin PA4 of the main control chip U1 is connected to the switching control circuit through the interface LED _ ON/OFF, the 35 th pin VSS of the main control chip U1 is grounded, the 44 th pin BOOT0 of the main control chip U1 is grounded, the 47 th pin VSS of the main control chip U1 is grounded, and the 48 th pin VDD of the main control chip U1 is grounded through the fourth capacitor C4 and the fifth capacitor C5.
Optionally, the switching control circuit includes a first switch circuit 310, a second switch circuit 320, and a third switch circuit 330;
the first switch circuit 310 is connected to the main control circuit, the second switch circuit 320, and the third switch circuit 330, and configured to receive a first control signal from the main control circuit, send a second control signal to the second switch circuit 320 according to the first control signal, and send a third control signal to the third switch circuit 330 according to the first control signal;
the second switch circuit 320 is connected to the first switch circuit 310 and the normal light bar circuit, and configured to receive a second control signal and control on and off of the normal light bar circuit according to the second control signal;
the third switch circuit 330 is connected to the first switch circuit 310 and the low blue stripe circuit, and configured to receive a third control signal and control the on/off of the low blue stripe circuit according to the third control signal.
Specifically, as shown in fig. 3, the first switch circuit 310 includes a second switch transistor Q2, a third switch transistor Q3, a fourth resistor R4, a fifth resistor R5, and a sixth resistor R6;
the base of the third switching tube Q3 is connected with one end of the sixth resistor R6, the collector of the third switching tube Q3 is connected with one end of the fourth resistor R4 and one end of the fifth resistor R5, and the emitter of the third switching tube Q3 is grounded; the other end of the sixth resistor R6 is connected with the main control circuit through an interface LED _ ON/OFF, the other end of the fourth resistor R4 is connected with a power supply with 5V voltage, and the other end of the fifth resistor R5 is connected with the base electrode of the second switching tube Q2; the emitter of the second switching tube Q2 is grounded; the collector of the second switching tube Q2 is connected to the second switching circuit 320 and the third switching circuit 330.
With continued reference to fig. 3, the second switch circuit 320 includes a first switch transistor Q1, a second resistor R2, a third resistor R3, a sixth capacitor C6, and a seventh capacitor C7;
one end of the second resistor R2 and one end of the third resistor R3 are connected with the first switch circuit 310; the other end of the second resistor R2 is connected with an LED _ POWER POWER supply, the LED _ POWER POWER supply is grounded through a sixth capacitor C6, the other end of the third resistor R3 is connected with the grid electrode of the first switch tube Q1, the other end of the third resistor R3 is connected with the source electrode of the first switch tube Q1 through a seventh capacitor C7, the source electrode of the first switch tube Q1 is connected with the LED _ POWER POWER supply, and the drain electrode of the first switch tube Q1 is connected with a normal light bar circuit through an interface LED _ POWER _ OUT.
With continued reference to fig. 3, the third switching circuit 330 includes a fourth switching tube Q4, a fifth switching tube Q5, a seventh diode D7, an eighth diode D8, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, and an eighth capacitor C8;
one end of the cathode of the seventh diode D7 is connected to the first switch circuit 310, and the anode of the other end is connected to one end of the seventh resistor R7 and one end of the eighth resistor R8; the other end of the seventh resistor R7 is connected with a power supply with 5V voltage, and the other end of the eighth resistor R8 is connected with the base electrode of the fourth switching tube Q4; a collector of the fourth switching tube Q4 is connected to one end of the ninth resistor R9 and one end of the tenth resistor R10, an emitter is connected to an anode of the eighth diode D8, and a cathode of the eighth diode D8 is grounded; the other end of the tenth resistor R10 is connected to the LED _ POWER supply, the other end of the ninth resistor R9 is connected to the gate of the fifth switch Q5, the other end of the ninth resistor R9 is connected to the source of the first switch Q5 through the eighth capacitor C8, the source of the fifth switch Q5 and the other end of the eighth capacitor C8 are connected to the LED _ POWER supply, and the drain of the fifth switch Q5 is connected to the low-blue light bar circuit through the interface LED _ POWER _ IN. Wherein, Q1, Q5 are field effect transistors, and Q2, Q3, Q4 are triodes.
Specifically, as shown IN fig. 4 and 5, the low-blue light bar circuit 140 is formed by sequentially connecting a first diode D1, a second diode D2, and a third diode D3 IN series, and the anode of the first diode D1 is connected to the third switch circuit 330 of the switching control circuit through an interface LED _ POWER _ IN; the normal light bar circuit 130 is formed by sequentially connecting a fourth diode D4, a fifth diode D5 and a sixth diode D6 in series, and the anode of the fourth diode D4 is connected with the second switch circuit 320 of the switching control circuit through an interface LED _ POWER _ OUT.
When the teaching all-in-one machine is just powered ON, the pin LED _ ON/OFF is in a low level state, namely an OFF state, and at the moment, the triode Q3 is cut OFF. Due to the high "+ 5V NORMAL", transistor Q2 is turned on, and diode D7 is turned on. Since the transistor Q2 is turned on, the fet Q1 is turned off, the pin LED _ POWER _ OUT is at a low level, and the light bar of the normal light bar circuit 130 does not emit light. Since the diode D7 is turned on, the transistor Q4 is turned off, so the fet Q5 is turned on, the pin LED _ POWER _ IN is at a high level, and the light bar of the low blue light bar circuit 140 emits light.
When the teaching all-in-one machine normally operates, the pin LED _ ON/OFF is in a high level state, namely an 'ON' state, and at the moment, the triode Q3 is conducted. Since the transistor Q3 is turned on, the base of the transistor Q2 is at a low level state, and the transistor Q2 is turned off, so that the fet Q1 is turned on, the pin LED _ POWER _ OUT is at a high level, and the light bar of the normal light bar circuit 130 emits light. Since the transistor Q2 is turned off, the transistor Q4 is turned on, so the fet Q5 is turned off, the pin LED _ POWER _ IN is at a low level, and the light bar of the low blue light bar circuit 140 does not emit light.
Optionally, the switching control circuit 120 is further configured to switch the light bar of the low blue light bar circuit 140 to illuminate when the software of the teaching machine fails.
Specifically, when software control fails, i.e., the processor is unable to send a switching control signal to the switching control circuit 120 via pin 13, LED _ ON/OFF is at a low level. At this time, the transistor Q3 is turned off, so the fet Q1 is turned off, the pin LED _ POWER _ OUT is at a low level, the light bar of the normal light bar circuit 130 does not emit light, the fet Q5 is turned on, the pin LED _ POWER _ IN is at a high level, and the light bar of the low blue light bar circuit 140 emits light.
Optionally, the switching control circuit 120 is further configured to switch to the low blue light bar circuit 140 to illuminate when the user switches the eye-protecting mode.
Specifically, when the teaching all-IN-one machine is IN normal operation, if the user clicks the eye protection mode, the processor sends an instruction through the LED _ ON/OFF communication interface, so that the original switching control circuit 120 is changed from LED _ POWER _ OUT to LED _ POWER _ IN, and the lamp strip group is changed from the lamp strip operation of the normal lamp strip circuit 130 to the lamp strip operation of the low blue lamp strip circuit 140.
Optionally, as shown in fig. 1, the color temperature adjusting circuit of the present invention further includes: the control circuit 150 is regulated. The adjusting control circuit 150 is connected to the main control circuit 110, the normal light bar circuit 130, and the low blue light bar circuit 140, and is configured to receive an adjusting control signal, and adjust the color temperature of the light bars of the normal light bar circuit 130 and the low blue light bar circuit 140 according to the adjusting control signal.
Specifically, as shown in fig. 6, the regulation control circuit includes a control chip U2, a first resistor R1, and a first capacitor C1. The IO pin of the CONTROL chip U2 is connected to the main CONTROL circuit 110 through the interface CONTROL, the VDD pin is connected to one end of the first resistor R1 and one end of the first capacitor C1, and the other end of the first capacitor is grounded. The OUTN pin is connected to the normal light bar circuit 130 through an N _ OUT interface, and the OUTB pin is connected to the low-blue light bar circuit 140 through a B _ OUT interface.
When the teaching all-in-one machine normally operates, the all-in-one machine mainboard U1 sends an instruction through the control communication interface, the backlight optical control module U2 of the all-in-one machine is controlled according to the sent instruction, the U2 controls the corresponding light bar group, and the color temperature of the all-in-one machine can be changed to the corresponding color temperature value according to the self-requirement of a user. Specifically, when the teaching all-in-one machine normally operates, and a user clicks a button for adjusting color temperature, after receiving the instruction, the all-in-one machine mainboard U1 sends the instruction to the control chip U2 through the control communication interface, and the control chip U2 controls the corresponding light bar group. For example, when the working light bar is a light bar with a normal color temperature, the control chip U2 sends different level signals to the normal light bar circuit through the interface N-OUT to adjust and control the light bar of the normal light bar circuit.
According to the technical scheme of the embodiment, the mode of software control of one group of the lamp bead group with the reduced color temperature and the other group of the lamp bead group with the standard color temperature in the light emitting source is automatically converted into hardware control when the software control fails, the lamp bead group with the reduced color temperature is controlled in a default mode, and the effect of entering the eye protection mode is achieved.
Example two
In this embodiment, a circuit board includes any one of the color temperature adjusting circuits provided in the first embodiment.
According to the technical scheme of the embodiment, the mode of software control of one group of the lamp bead group with the reduced color temperature and the other group of the lamp bead group with the standard color temperature in the light emitting source is automatically converted into hardware control when the software control fails, the lamp bead group with the reduced color temperature is controlled in a default mode, and the effect of entering the eye protection mode is achieved.
EXAMPLE III
In this embodiment, an all-in-one teaching machine includes the circuit board that embodiment two provided.
According to the technical scheme of the embodiment, the mode of software control of one group of the lamp bead group with the reduced color temperature and the other group of the lamp bead group with the standard color temperature in the light emitting source is automatically converted into hardware control when the software control fails, the lamp bead group with the reduced color temperature is controlled in a default mode, and the effect of entering the eye protection mode is achieved.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments illustrated herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims (9)

1. The utility model provides a colour temperature regulating circuit for teaching all-in-one, its characterized in that includes: the LED lamp comprises a main control circuit, a switching control circuit, a normal lamp bar circuit and a low blue lamp bar circuit;
the master control circuit is connected with the switching control circuit and used for sending a switching control signal to the switching control circuit;
the switching control circuit is connected with the main control circuit, the normal light bar circuit and the low blue light bar circuit and used for receiving the switching control signal, and the switching control circuit is configured to control the light bars of the low blue light bar circuit to shine when the teaching all-in-one machine is just powered on; when the teaching all-in-one machine normally operates, the lamp strip switched to the normal lamp strip circuit shines;
the switching control circuit is further configured to switch the light bar of the low blue light bar circuit to illuminate when software of the teaching all-in-one machine fails.
2. The color temperature adjustment circuit of claim 1, wherein the switching control circuit comprises a first switch circuit, a second switch circuit, a third switch circuit;
the first switch circuit is connected with the main control circuit, the second switch circuit and the third switch circuit, and is configured to receive a first control signal of the main control circuit, send a second control signal to the second switch circuit according to the first control signal, and send a third control signal to the third switch circuit according to the first control signal;
the second switch circuit is connected with the first switch circuit and the normal light bar circuit, and is configured to receive the second control signal and control the on and off of the normal light bar circuit according to the second control signal;
the third switch circuit is connected with the first switch circuit and the low blue light bar circuit, and is configured to receive the third control signal and control the on and off of the low blue light bar circuit according to the third control signal.
3. The color temperature adjusting circuit of claim 2, wherein the first switch circuit comprises a second switch tube (Q2), a third switch tube (Q3), a fourth resistor (R4), a fifth resistor (R5), and a sixth resistor (R6);
the base electrode of the third switching tube (Q3) is connected with one end of a sixth resistor (R6), the collector electrode of the third switching tube (Q3) is connected with one ends of a fourth resistor (R4) and a fifth resistor (R5), and the emitter electrode of the third switching tube (Q3) is grounded; the other end of the sixth resistor (R6) is connected with the main control circuit through an interface LED _ ON/OFF, the other end of the fourth resistor (R4) is connected with a power supply with 5V voltage, and the other end of the fifth resistor (R5) is connected with the base electrode of the second switching tube (Q2); the emitter of the second switching tube (Q2) is grounded; the collector of the second switching tube (Q2) is connected with the second switching circuit and the third switching circuit.
4. The color temperature adjusting circuit of claim 2, wherein the second switch circuit comprises a first switch transistor (Q1), a second resistor (R2), a third resistor (R3), a sixth capacitor (C6), and a seventh capacitor (C7);
wherein one end of a second resistor (R2) and one end of a third resistor (R3) are connected with the first switch circuit; the other end of the second resistor (R2) is connected with an LED _ POWER POWER supply, the LED _ POWER POWER supply is grounded through a sixth capacitor (C6), the other end of the third resistor (R3) is connected with the grid electrode of the first switch tube (Q1), the other end of the third resistor (R3) is connected with the source electrode of the first switch tube (Q1) through a seventh capacitor (C7), the source electrode of the first switch tube (Q1) is connected with the LED _ POWER POWER supply, and the drain electrode of the first switch tube (Q1) is connected with the normal light bar circuit through an interface LED _ POWER _ OUT.
5. The color temperature adjusting circuit of claim 2, wherein the third switching circuit comprises a fourth switching tube (Q4), a fifth switching tube (Q5), a seventh diode (D7), an eighth diode (D8), a seventh resistor (R7), an eighth resistor (R8), a ninth resistor (R9), a tenth resistor (R10), and an eighth capacitor (C8);
one end of a cathode of the seventh diode (D7) is connected with the first switch circuit, and the anode of the other end of the seventh diode (D7) is connected with one end of the seventh resistor (R7) and one end of the eighth resistor (R8); the other end of the seventh resistor (R7) is connected with a power supply with 5V voltage, and the other end of the eighth resistor (R8) is connected with the base electrode of the fourth switching tube (Q4); a collector of the fourth switching tube (Q4) is connected with one end of a ninth resistor (R9) and one end of a tenth resistor (R10), an emitter of the fourth switching tube is connected with a positive electrode of an eighth diode (D8), and a negative electrode of the eighth diode (D8) is grounded; the other end of the tenth resistor (R10) is connected with the LED _ POWER POWER supply, the other end of the ninth resistor (R9) is connected with the grid electrode of the fifth switch tube (Q5), the other end of the ninth resistor (R9) is connected with the source electrode of the first switch tube (Q5) through the eighth capacitor (C8), the source electrode of the fifth switch tube (Q5) and the other end of the eighth capacitor (C8) are connected with the LED _ POWER POWER supply, and the drain electrode of the fifth switch tube (Q5) is connected with the low-blue light bar circuit through an interface LED _ POWER _ IN.
6. The color temperature adjustment circuit of claim 1, further comprising an adjustment control circuit;
the main control circuit is connected with the regulation control circuit and used for sending a regulation control signal to the regulation control circuit;
the adjusting control circuit is connected with the main control circuit, the normal light bar circuit and the low blue light bar circuit and used for receiving the adjusting control signal and adjusting the color temperature of the light bars of the normal light bar circuit and the low blue light bar circuit according to the adjusting control signal.
7. The color temperature adjustment circuit of claim 1, wherein the switching control circuit is further configured to switch the light bar of the low-blue light bar circuit to illuminate when a user switches the eye-protecting mode.
8. A circuit board comprising the color temperature adjusting circuit according to any one of claims 1 to 7.
9. An all-in-one teaching machine, comprising the circuit board of claim 8.
CN201910068699.8A 2019-01-24 2019-01-24 Color temperature adjusting circuit, circuit board and teaching all-in-one machine Active CN109688663B (en)

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Citations (3)

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Publication number Priority date Publication date Assignee Title
CN103517532A (en) * 2013-10-22 2014-01-15 柳州天运寰通科技有限公司 LED automobile headlight with adjustable brightness and color temperature
CN204929351U (en) * 2015-08-27 2015-12-30 中山市欧曼科技照明有限公司 Novel LED lamp control system
CN206650873U (en) * 2017-03-16 2017-11-17 深圳市金叶光线发展有限公司 Multiple-channel output LED drive power

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Publication number Priority date Publication date Assignee Title
US9510419B2 (en) * 2014-11-20 2016-11-29 Abl Ip Holding Llc Temperature adjusted dimming controller

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103517532A (en) * 2013-10-22 2014-01-15 柳州天运寰通科技有限公司 LED automobile headlight with adjustable brightness and color temperature
CN204929351U (en) * 2015-08-27 2015-12-30 中山市欧曼科技照明有限公司 Novel LED lamp control system
CN206650873U (en) * 2017-03-16 2017-11-17 深圳市金叶光线发展有限公司 Multiple-channel output LED drive power

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