CN112135382B - Indicating lamp control circuit and electric equipment - Google Patents
Indicating lamp control circuit and electric equipment Download PDFInfo
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- CN112135382B CN112135382B CN202011022392.3A CN202011022392A CN112135382B CN 112135382 B CN112135382 B CN 112135382B CN 202011022392 A CN202011022392 A CN 202011022392A CN 112135382 B CN112135382 B CN 112135382B
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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
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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
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
Abstract
The invention discloses an indicator light control circuit and electric equipment, wherein the indicator light control circuit comprises a signal source selection module, a control module and a driving module which are sequentially connected; the signal source selection module is used for outputting a control signal to the control module according to a first signal source or a second signal source, the control module is used for outputting a positive polarity driving signal or a negative polarity driving signal to the driving module according to the control signal, and the driving module is used for driving a positive polarity indicator lamp to be lightened according to the positive polarity driving signal or driving a negative polarity indicator lamp to be lightened according to the negative polarity driving signal, so that the driving control of indicator lamps with different polarities can be realized, two signal sources can be supported, and the compatibility of an indicator lamp control circuit is improved.
Description
Technical Field
The invention relates to the technical field of electronic equipment, in particular to an indicator light control circuit and electric equipment.
Background
The circuit for controlling the indicator lamp in the main board of the existing electric equipment can only output a high level signal with positive polarity to drive the indicator lamp to be lightened or can only output a low level signal with negative polarity to drive the indicator lamp to be lightened, and once the driving polarity of the selected indicator lamp is not matched with the main board, the indicator lamp cannot be lightened, the board design needs to be changed again for matching, and the design cost is increased; in addition, when the mainboard is designed, the high and low levels of the GPIO signals can be output only by adopting the control of the main chip, so that the on and off of the indicator light are controlled, and the main chip does not supply power when some products are in standby, so that the GPIO signals cannot be controlled, and the indicator light is not controlled or is not on; therefore, the compatibility of the indicating lamp control circuit in the existing main board is poor, and the signal source of the indicating lamp control is single.
Thus, the prior art has yet to be improved and enhanced.
Disclosure of Invention
In view of the defects of the prior art, the invention aims to provide an indicator light control circuit and electric equipment, which can effectively solve the problems of poor compatibility and single control signal source of the existing indicator light control circuit.
In order to achieve the purpose, the invention adopts the following technical scheme:
an indicator lamp control circuit comprises a signal source selection module, a control module and a driving module; the signal source selection module is used for outputting a control signal to the control module according to a first signal source or a second signal source, the control module is used for outputting a positive polarity driving signal or a negative polarity driving signal to the driving module according to the control signal, and the driving module is used for driving a positive polarity indicator lamp to be lightened according to the positive polarity driving signal or driving a negative polarity indicator lamp to be lightened according to the negative polarity driving signal.
In the indicator light control circuit, the signal source selection module comprises a first selection unit and a second selection unit, the first selection unit is used for outputting a control signal to the control module according to a first signal source, or the second selection unit is used for outputting a control signal to the control module according to a second signal source.
In the indicator light control circuit, the driving module comprises a first driving unit and a second driving unit; the first driving unit is used for driving the indicator light with positive polarity to be turned on according to the positive polarity driving signal; the second driving unit is used for driving the indicator light with the negative polarity to be lightened according to the negative polarity driving signal.
In the indicator light control circuit, the first selection unit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor and a sixth resistor; one end of the first resistor is connected with a power supply, the other end of the first resistor, one end of the second resistor and one end of the third resistor are connected with a first signal source input end, the other end of the second resistor is grounded, and the other end of the third resistor is connected with the control module; one end of the fourth resistor is connected with the power supply, the other end of the fourth resistor, one end of the fifth resistor and one end of the sixth resistor are connected with the input end of the first signal source, the other end of the fifth resistor is grounded, and the other end of the sixth resistor is connected with the control module.
In the indicator light control circuit, the second selection unit comprises a seventh resistor, an eighth resistor and a ninth resistor; one end of the seventh resistor is connected with the power supply, the other end of the seventh resistor and one end of the eighth resistor are both connected with the input end of a second signal source, and the other end of the eighth resistor is connected with the control module; one end of the ninth resistor is connected with the input end of the second signal source, and the other end of the ninth resistor is connected with the control module.
In the indicating lamp control circuit, the first driving unit comprises a tenth resistor and an eleventh resistor, one end of the tenth resistor is connected with the positive polarity driving signal input end, one end of the eleventh resistor is connected with the positive polarity driving signal input end, and the other end of the tenth resistor and the other end of the eleventh resistor are both connected with the indicating lamp.
In the indicator light control circuit, the second driving unit includes a twelfth resistor and a thirteenth resistor, one end of the twelfth resistor is connected to the negative polarity driving signal input terminal, one end of the thirteenth resistor is connected to the negative polarity driving signal input terminal, and the other end of the twelfth resistor and the other end of the thirteenth resistor are both connected to the indicator light.
In the indicator light control circuit, the control module comprises a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a seventeenth resistor, an eighteenth resistor, a nineteenth resistor, a twentieth resistor, a twenty-first resistor, a twenty-second resistor, a twenty-third resistor, a first triode, a second triode and a third triode;
one end of the fourteenth resistor is connected to the signal source selection module, one end of the fifteenth resistor is connected to the signal source selection module, the other end of the fourteenth resistor and the other end of the fifteenth resistor are both connected to the base of the first triode, the emitter of the first triode is grounded, and the collector of the first triode is connected to one end of the sixteenth resistor, one end of the seventeenth resistor and one end of the eighteenth resistor; the other end of the sixteenth resistor is connected with the driving module, the other end of the seventeenth resistor is connected with the power supply, the other end of the eighteenth resistor, one end of the nineteenth resistor and one end of the twentieth resistor are connected with the base electrode of the second triode, the emitting electrode of the second triode is grounded, the collector electrode of the second triode, one end of the twenty-first resistor and one end of the twenty-second resistor are connected with the driving module, the other end of the twenty-first resistor is connected with the power supply, and the other end of the twenty-second resistor is connected with the driving module; one end of the twenty-third resistor is connected with an emitting electrode of the third triode, the other end of the twenty-third resistor is connected with the driving module, a base electrode of the third triode is connected with the signal source selection module, and a collector electrode of the third triode is grounded.
In the indicating lamp control circuit, the first triode and the second triode are both N-type triodes, and the third triode is a P-type triode.
The electric equipment comprises a mainboard and an indicator light, wherein the mainboard is provided with a main chip and the indicator light control circuit.
Compared with the prior art, the indicating lamp control circuit and the electric equipment provided by the invention have the advantages that the indicating lamp control circuit comprises the signal source selection module, the control module and the driving module which are sequentially connected; the signal source selection module is used for outputting a control signal to the control module according to a first signal source or a second signal source, the control module is used for outputting a positive polarity driving signal or a negative polarity driving signal to the driving module according to the control signal, and the driving module is used for driving a positive polarity indicator lamp to be lightened according to the positive polarity driving signal or driving a negative polarity indicator lamp to be lightened according to the negative polarity driving signal, so that the driving control of indicator lamps with different polarities can be realized, two signal sources can be supported, and the compatibility of an indicator lamp control circuit is improved.
Drawings
Fig. 1 is a block diagram of an indicator light control circuit according to the present invention;
fig. 2 and fig. 3 are schematic circuit diagrams of a first selection unit and a second selection unit in the indicator light control circuit provided by the present invention;
fig. 4 is a schematic circuit diagram of a first driving unit and a second driving unit in the indicator light control circuit provided by the present invention;
fig. 5 and 6 are schematic circuit diagrams of a control module in the indicator light control circuit provided by the invention;
fig. 7 is a schematic circuit diagram of a chip module in the indicator light control circuit according to the present invention.
Detailed Description
The invention aims to provide an indicator light control circuit and electric equipment, which can effectively solve the problems of poor compatibility and single control signal source of the existing indicator light control circuit.
In order to make the objects, technical solutions and effects of the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
Referring to fig. 1, an indicator light control circuit 10 provided by the present invention includes a signal source selection module 100, a control module 200, and a driving module 300, wherein the signal source selection module 100, the control module 200, and the driving module 300 are sequentially connected, and the driving module 300 is further connected to an indicator light 20; the signal source selection module 100 is configured to output a control signal to the control module 200 according to the first signal source or the second signal source, the control module 200 is configured to output a positive polarity driving signal or a negative polarity driving signal to the driving module 300 according to the control signal, and the driving module 300 is configured to drive the indicator light 20 with the positive polarity to be turned on according to the positive polarity driving signal or drive the indicator light 20 with the negative polarity to be turned on according to the negative polarity driving signal, so that the indicator light 20 with the positive polarity can be driven, and the indicator light 20 with the negative polarity can also be driven.
The signal source selection module 100 provided in the present invention can select a first signal source and also can select a second signal source, in this embodiment, the first signal source is a signal provided by the main chip 30, and the second signal source is a signal provided by the single chip microcomputer U1; in specific implementation, the signal source selection module 100 can select any one signal source according to actual needs to control the indicator light 20, and the corresponding main board can control the indicator light 20 through the GPIO port of the main chip 30 and can also control the indicator light 20 through other signal sources, thereby avoiding the problem of single control signal source; the corresponding control module 200 outputs a positive polarity driving signal or a negative polarity driving signal to the driving module 300 according to the control signal output by the signal source selection module 100; the driving module 300 selects the positive driving signal to drive the corresponding indicator light 20 when the positive indicator light 20 needs to be driven to light up, and selects the negative driving signal to drive the corresponding indicator light 20 when the negative indicator light 20 needs to be driven to light up, thereby improving the compatibility of the indicator light control circuit 10.
Further, referring to fig. 2 and fig. 3, the signal source selection module 100 includes a first selection unit 110 and a second selection unit 120, and both the first selection unit 110 and the second selection unit 120 are connected to the control module 200; the first selecting unit 110 is configured to output a control signal to the control module 200 according to a first signal source, or the second selecting unit 120 is configured to output a control signal to the control module 200 according to a second signal source, in this embodiment, the first selecting unit 110 is connected to the main chip 30 to receive the first signal source, and the second selecting unit 120 is connected to the single chip microcomputer U1 to receive the second signal source; when the first signal source is required to control and instruct the indicator lamp to work, the first selection unit 110 outputs a control signal to the control module 200 according to the first signal source to control the indicator lamp 20 to light up, and when the second signal source is required to sample and control the indicator lamp 20 to work, the second selection unit 120 outputs a control signal to the control module 200 according to the second signal source to control the indicator lamp 20 to light up, so that the singleness of the signal source can be avoided, and the application range of the indicator lamp control circuit 10 can be improved.
Further, referring to fig. 4, the driving module 300 includes a first driving unit 310 and a second driving unit 320, the first driving unit 310 is connected to the control module 200 and the indicator light 20, respectively, and the second driving unit 320 is connected to the control module 200 and the indicator light 20, respectively; the first driving unit 310 is used for driving the indicator light 20 with positive polarity to light according to the positive polarity driving signal; the second driving unit 320 is used for driving the indicator light 20 with the negative polarity to light according to the driving signal with the negative polarity; when the indicator light 20 to be driven to be turned on is the indicator light 20 with positive polarity, the first driving unit 310 drives the indicator light 20 to be turned on according to the positive polarity driving signal, and when the indicator light 20 to be driven to be turned on is the indicator light 20 with negative polarity, the second driving unit 320 drives the indicator light 20 to be turned on according to the negative polarity driving signal, so that the indicator lights 20 with different polarities are driven, and the compatibility of the indicator light control circuit 10 is improved.
Further, with continuing reference to fig. 2 and 3, the first selection unit 110 includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, and a sixth resistor R6; one end of the first resistor R1 is connected with the power, the other end of the first resistor R1, one end of the second resistor R2 and one end of the third resistor R3 are connected with the input end of the first signal source, the other end of the second resistor R2 is grounded, and the other end of the third resistor R3 is connected with the control module 200; one end of the fourth resistor R4 is connected with the power supply, the other end of the fourth resistor R4, one end of the fifth resistor R5 and one end of the sixth resistor R6 are connected with the first signal source input end, the other end of the fifth resistor R5 is grounded, and the other end of the sixth resistor R6 is connected with the control module 200; in the present embodiment, the indicator light control circuit 10 controls the blue light and the red light to be turned on.
Specifically, a circuit composed of a first resistor R1, a second resistor R2, and a third resistor R3 is used for outputting a control signal for controlling the BLUE light to the control module 200 according to a first signal source, a first signal source input end connected to another end of the first resistor R1, one end of the second resistor R2, and one end of the third resistor R3 in this embodiment is an LED _ RK3288_ WORK signal end, and another end of the third resistor R3 is connected to the control module 200 through an LED-BLUE-CRL signal end; the fourth resistor R4, the fifth resistor R5, and the sixth resistor R6 are configured to output a control signal for controlling the RED light to the control module 200 according to the first signal source, and the input end of the first signal source, which is connected to the other end of the fourth resistor R4, the one end of the fifth resistor R5, and the one end of the sixth resistor R6 in this embodiment, is an LED _ RK3288_ STB signal end, and the other end of the sixth resistor R6 is connected to the control module 200 through an LED-RED-CRL signal end, in this embodiment, when the main chip 30 is used as a control source, the first selection unit 110 can receive the first signal source through the LED _ RK3288_ WORK signal end and the LED _ RK3288_ STB signal end, respectively, so as to implement control of the working states of the blue light and the RED light.
Further, the second selection unit 120 includes a seventh resistor R7, an eighth resistor R8, and a ninth resistor R9; one end of the seventh resistor R7 is connected with the power supply, the other end of the seventh resistor R7 and one end of the eighth resistor R8 are both connected with the input end of the second signal source, and the other end of the eighth resistor R8 is connected with the control module 200; one end of the ninth resistor R9 is connected to the second signal source input end, and the other end of the ninth resistor R9 is connected to the control module 200; similarly, when the single chip microcomputer U1 is used as a control source, a circuit part consisting of the seventh resistor R7 and the eighth resistor R8 is used for outputting a control signal for controlling the blue light according to a second signal source, and a circuit part correspondingly connected with the ninth resistor R9 is used for outputting a control signal for controlling the red light according to the second signal; the other end of the corresponding eighth resistor R8 is also connected to the control module 200 through an LED-BLUE-CRL signal end, the other end of the ninth resistor R9 is also connected to the control module 200 through an LED-RED-CRL signal end, and the input end of the second signal source in this embodiment is an LED _ MCU signal end; therefore, when the singlechip U1 is selected as a control source, control signals can be respectively output for the blue light and the red light to control.
Further, referring to fig. 4, the first driving unit 310 includes a tenth resistor R10 and an eleventh resistor R11, one end of the tenth resistor R10 is connected to the positive polarity driving signal input end, one end of the eleventh resistor R11 is connected to the positive polarity driving signal input end, and the other end of the tenth resistor R10 and the other end of the eleventh resistor R11 are both connected to the indicator light 20, in this embodiment, the positive polarity driving signal input end connected to one end of the tenth resistor R10 is an led b + signal end, and the positive polarity driving signal input end connected to one end of the eleventh resistor R11 is an led R + signal end, so that the led b + signal end receives the positive polarity driving signal and outputs the positive polarity driving signal through the tenth resistor R10 to drive the blue light with positive polarity to be turned on, and the led R + signal end receives the positive polarity driving signal and outputs the positive polarity driving signal through the eleventh resistor R11 to drive the red light with positive polarity to be turned on, thereby controlling the blue light with positive polarity and the red light with double color.
Further, the second driving unit 320 includes a twelfth resistor R12 and a thirteenth resistor R13, one end of the twelfth resistor R12 is connected to the negative polarity driving signal input terminal, one end of the thirteenth resistor R13 is connected to the negative polarity driving signal input terminal, and the other ends of the twelfth resistor R12 and the thirteenth resistor R13 are both connected to the indicator light 20; in this embodiment, the negative polarity driving signal input end connected to one end of the twelfth resistor R12 is an led b-signal end, and the negative polarity driving signal input end connected to one end of the thirteenth resistor R13 is an led R-signal end, so that the led b-signal end receives the negative polarity driving signal and outputs the negative polarity driving signal through the twelfth resistor R12 to drive the blue light with the negative polarity to be turned on, and the led R-signal end receives the negative polarity driving signal and outputs the negative polarity driving signal through the thirteenth resistor R13 to drive the red light with the negative polarity to be turned on, thereby controlling the blue light with the negative polarity and the red light.
Further, referring to fig. 5 and fig. 6, the control module 200 includes a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16, a seventeenth resistor R17, an eighteenth resistor R18, a nineteenth resistor R19, a twentieth resistor R20, a twenty-first resistor R21, a twenty-second resistor R22, a twenty-third resistor R23, a first transistor Q1, a second transistor Q2, and a third transistor Q3; one end of a fourteenth resistor R14 is connected with the signal source selection module 100, one end of a fifteenth resistor R15 is connected with the signal source selection module 100, the other end of the fourteenth resistor R14 and the other end of the fifteenth resistor R15 are both connected with the base electrode of the first triode Q1, the emitting electrode of the first triode Q1 is grounded, and the collector electrode of the first triode Q1 is connected with one end of a sixteenth resistor R16, one end of a seventeenth resistor R17 and one end of an eighteenth resistor R18; the other end of the sixteenth resistor R16 is connected with the driving module 300, the other end of the seventeenth resistor R17 is connected with the power supply, the other end of the eighteenth resistor R18, one end of the nineteenth resistor R19 and one end of the twentieth resistor R20 are connected with the base electrode of the second triode Q2, the emitting electrode of the second triode Q2 is grounded, the collector electrode of the second triode Q2, one end of the twenty-first resistor R21 and one end of the twenty-second resistor R22 are connected with the driving module 300, the other end of the twenty-first resistor R21 is connected with the power supply, and the other end of the twenty-second resistor R22 is connected with the driving module 300; one end of the twenty-third resistor R23 is connected to the emitter of the third triode Q3, the other end of the twenty-third resistor R23 is connected to the driving module 300, the base of the third triode Q3 is connected to the signal source selection module 100, and the collector of the third triode Q3 is grounded.
In specific implementation, in this embodiment, one end of the fourteenth resistor R14 is connected to the signal source selection module 100 through the LED-BLUE-CRL signal end, and receives a control signal for controlling the BLUE light output by the signal source selection circuit through the signal end, one end of the fifteenth resistor R15 is connected to the signal source selection module 100 through the LED-RED-CRL signal end, and the base of the third triode Q3 is connected to the signal source selection module 100 through the LED-RED-CRL signal end, and receives a macro signal for controlling the RED light output by the signal source selection circuit through the signal end; the other end of the sixteenth resistor R16 is connected to the driving module 300 through an LEDB + signal end, and outputs a negative polarity driving signal for driving the blue light, one end of the seventeenth resistor R17 is an LEDR + signal end through which a positive polarity driving signal for driving the red light can be output, the other end of the twenty-second resistor R22 is connected to the driving module 300 through an LEDR-signal end, the other end of the twenty-third resistor R23 is connected to the driving module 300 through an LEDR-signal end, and outputs a negative polarity driving signal for driving the red light, the collector of the second triode Q2, one end of the twenty-first resistor R21, and one end of the twenty-second resistor R22 are connected to the driving module 300 through an LEDB + signal end, and outputs a positive polarity driving signal for driving the blue light through the signal end, so that the control module 200 outputs a corresponding driving signal to the driving module 300 according to the received control signal, thereby realizing control of the indicator lights 20 with different polarities.
Further, referring to fig. 1 and fig. 7 together, the indicator light control circuit 10 further includes a single chip microcomputer module 400, wherein the single chip microcomputer module 400 is connected to the signal source selection module 100 and is configured to provide a second signal source for the signal source selection module 100; specifically, the single chip microcomputer module 400 includes a single chip microcomputer U1, a first capacitor C1 and a second capacitor C2, one end of the first capacitor C1 is connected, one end of the second capacitor C2 and a 1 st pin of the single chip microcomputer U1 are all connected with power, the other end of the first capacitor C1 and the other end of the second capacitor C2 are both connected to ground, a 5 th pin of the single chip microcomputer U1 is connected to an LED _ MCU signal terminal, the model of the single chip microcomputer U1 is ZQ2996 in this embodiment, and of course, the single chip microcomputer U1 having the same function is selected in other embodiments, which is not limited in this respect.
For easy understanding, referring to fig. 1 to fig. 7, the working principle of the indicator light control circuit 10 of the present invention will be described in detail below with reference to the following embodiments:
when the main chip 30 is used as a control source to control the indicator light 20 with positive polarity to be turned on, the first resistor R1, the third resistor R3, the fourth resistor R4, the sixth resistor R6, the fifteenth resistor R15, the first triode Q1, the seventeenth resistor R17, the twentieth resistor R20, the second triode Q2, the twenty-first resistor R21, the tenth resistor R10 and the eleventh resistor R11 need to be mounted, and the rest components are in an NC state.
If the indicator light 20 is a blue light, when the control signal LED _ RK3288_ WORK output by the main chip 30 is at a low level, the base of the second triode Q2 is at a low level, and the conduction condition is not satisfied, so that the second triode Q2 is in a cut-off state, and the LED b + signal end outputs a high level to drive the blue light with positive polarity to be turned on; when the control signal LED _ RK3288_ WORK output by the main chip 30 is at a high level, the base of the second transistor Q2 is at a high level, which satisfies the conducting condition, so that the second transistor Q2 is in a conducting state, and the LED b + signal port is conducted to ground, and the blue lamp with positive polarity cannot be driven, and the blue lamp is turned off.
If the indicator light 20 is a red light, when the control signal LED _ RK3288_ STB output by the main chip 30 is at a low level, the base of the first triode Q1 is at a low level, and does not satisfy the conducting condition, so that the first triode Q1 is in a cut-off state, and the signal end of the LED r + outputs a high level to drive the positive red light to be turned on; when the control signal LED _ RK3288_ STB output by the main chip 30 is at a high level, the base of the first transistor Q1 is at a high level, which satisfies the conducting condition, so that the first transistor Q1 is in a conducting state, and the LED r + signal port is conducted to ground, and cannot drive the positive red light, and the red light goes out.
When the main chip 30 is used as a control source to control the indicator light 20 with the negative polarity to be turned on, the first resistor R1, the third resistor R3, the fourth resistor R4, the sixth resistor R6, the fourteenth resistor R14, the first triode Q1, the sixteenth resistor R16, the nineteenth resistor R19, the second triode Q2, the twenty second resistor R22, the twelfth resistor R12 and the thirteenth resistor R13 need to be mounted, and the rest components are in an NC state.
If the indicator light 20 is a blue light, when the control signal LED _ RK3288_ WORK output by the main chip 30 is at a high level, the base of the second triode Q2 is at a high level, which satisfies the conducting condition, so that the second triode Q2 is in a conducting state, and the LED b-signal terminal is conducted to the ground, so as to drive the blue light with negative polarity to light; when the control signal LED _ RK3288_ WORK output by the main chip 30 is at a low level, the base of the second transistor Q2 is at a low level, and the conduction condition is not satisfied, so the second transistor Q2 is in a cut-off state, the LED b-signal end is suspended without being grounded, and the blue lamp with negative polarity cannot be driven, and the blue lamp is turned off.
If the indicator light 20 is a red light, when the control signal LED _ RK3288_ STB output by the main chip 30 is at a high level, the base of the first triode Q1 is at a high level, which satisfies the conducting condition, so that the first triode Q1 is in a conducting state, so that the LED r-signal terminal is conducted to the ground, and the red light with negative polarity is driven to light; when the control signal LED _ RK3288_ STB output by the main chip 30 is at a low level, the base of the first triode Q1 is at a low level, and does not satisfy the conducting condition, so that the first triode Q1 is in a cut-off state, the LED r-signal terminal is suspended without being grounded, and cannot drive the negative-polarity red light, and the red light goes out.
When the single chip microcomputer U1 is used as a control source to control the indicator light 20 with positive polarity to be turned on, the single chip microcomputer U1, the first capacitor C1, the second capacitor C2, the seventh resistor R7, the eighth resistor R8, the fourteenth resistor R14, the first triode Q1, the seventeenth resistor R17, the eighteenth resistor R18, the second triode Q2, the twenty-first resistor R21, the tenth resistor R10 and the eleventh resistor R11 all need to be pasted, and the rest components are in an NC state.
In this embodiment, the blue light and the red light can be controlled simultaneously, when the control signal LED _ MCU output by the single chip microcomputer U1 is at a high level, the base of the first triode Q1 is at a high level, and the conduction condition is satisfied, so that Q9 is in a conduction state, the LED r + signal terminal is conducted to the ground, the red light with positive polarity cannot be driven, and the red light is turned off; meanwhile, as the LEDR + signal end is conducted to the ground, the base electrode of the second triode Q2 is at a low level and does not meet the conducting condition, the second triode Q2 is in a cut-off state, so that the LEDB + signal end outputs a high level to drive the blue lamp with positive polarity to be lightened; when the control signal LED _ MCU output by the singlechip U1 is at a low level, the base electrode of the first triode Q1 is at a low level and does not meet the conduction condition, so that the first triode Q1 is in a cut-off state, the LEDR + signal end outputs a high level to drive a positive red light, and the red light is on; meanwhile, the base electrode of the second triode Q2 is at a high level due to the fact that the LEDR + signal end is at a high level, the conducting condition is met, the second triode Q2 is in a conducting state, the LEDB + signal end is conducted to the ground, the positive blue lamp cannot be driven, and the blue lamp is turned off.
When the indicating lamp 20 with the positive polarity is controlled to be turned on by taking the singlechip U1 as a control source, the singlechip U1, the first capacitor C1, the second capacitor C2, the seventh resistor R7, the eighth resistor R8, the ninth resistor R9, the fourteenth resistor R14, the first triode Q1, the sixteenth resistor R16, the third triode Q3, the twenty-third resistor R23, the twelfth resistor R12 and the thirteenth resistor R13 all need to be pasted, and the state of the chip and the components is NC.
In this embodiment, the blue light and the red light can be controlled simultaneously, and when the control signal LED _ MCU output by the single chip microcomputer U1 is at a high level, the base of the first triode Q1 is at a high level, which satisfies the conduction condition, so that the first triode Q1 is in a conduction state, and the LED b-signal terminal is conducted to the ground, and the blue light with negative polarity is driven, and the blue light is on; meanwhile, the base electrode of the third triode Q3 is at a high level due to the fact that the control signal LED _ MCU is at a high level, and the conduction condition is not met, so that the third triode Q3 is in a cut-off state, the LEDR-signal end is suspended and not in the ground, the red light with the negative polarity cannot be driven, and the red light is turned off; when a control signal LED _ MCU output by the singlechip U1 is at a low level, the base electrode of the first triode Q1 is at a low level and does not meet the conduction condition, so that the first triode Q1 is in a cut-off state, an LEDB-signal end is suspended and is not grounded, no negative is generated to drive a blue lamp with negative polarity, and the blue lamp is turned off; meanwhile, the base electrode of the third triode Q3 is at low level due to the fact that the control signal LED _ MCU is at low level, and the conducting condition is met, so that the third triode Q3 is in a conducting state, the LEDR-signal end is conducted to the ground, the red light with negative polarity is driven, and the red light is on.
The indicating lamp control circuit 10 disclosed by the invention is compatible with positive polarity driving and negative polarity driving modes, can select component mounting or non-mounting according to actual product requirements without changing the board design again for meeting, so that the indicating lamp 20 selected at the rear end is not limited, a mainboard has more universality and flexibility, and the design cost of changing the board again is reduced; meanwhile, the two control sources of the main chip 30 and the single chip microcomputer U1 are compatible, the problem that the indicating lamp 20 is not controlled or the indicating lamp 20 is not turned on due to the fact that the main chip 30 does not supply power when some products are in standby is solved, and the indicating lamp 20 can be controlled by the single chip microcomputer U1 at the moment.
The invention also correspondingly provides electric equipment which comprises a main board and an indicator light, wherein the main board is provided with a main chip and the indicator light control circuit, and the indicator light control circuit is described in detail above and is not repeated herein.
In summary, according to the indicator light control circuit and the electric equipment provided by the invention, the indicator light control circuit comprises a signal source selection module, a control module and a driving module; the signal source selection module is used for outputting a control signal to the control module according to a first signal source or a second signal source, the control module is used for outputting a positive polarity driving signal or a negative polarity driving signal to the driving module according to the control signal, and the driving module is used for driving a positive polarity indicator lamp to be lightened according to the positive polarity driving signal or driving a negative polarity indicator lamp to be lightened according to the negative polarity driving signal, so that the driving control of indicator lamps with different polarities can be realized, two signal sources can be supported, and the compatibility of an indicator lamp control circuit is improved.
It should be understood that equivalents and modifications of the technical solution and inventive concept thereof may occur to those skilled in the art, and all such modifications and alterations should fall within the scope of the appended claims.
Claims (10)
1. An indicator lamp control circuit is characterized by comprising a signal source selection module, a control module and a driving module which are connected in sequence;
the signal source selection module is used for outputting a control signal to the control module according to a first signal source, the control module is used for outputting a positive polarity driving signal to the driving module according to the control signal, and the driving module is used for driving a positive polarity indicator lamp to be turned on according to the positive polarity driving signal;
the signal source selection module is further used for outputting a control signal to the control module according to a second signal source, the control module is further used for outputting a negative driving signal to the driving module according to the control signal, and the driving module is further used for driving a negative indicator light to be turned on according to the negative driving signal.
2. The indicator light control circuit of claim 1, wherein the signal source selection module comprises a first selection unit and a second selection unit, the first selection unit being configured to output a control signal to the control module according to a first signal source, or the second selection unit being configured to output a control signal to the control module according to a second signal source.
3. The indicator light control circuit of claim 1, wherein the driving module comprises a first driving unit and a second driving unit; the first driving unit is used for driving the indicator light with positive polarity to be lightened according to the driving signal with positive polarity; the second driving unit is used for driving the indicator light with the negative polarity to be lightened according to the driving signal with the negative polarity.
4. The indicator lamp control circuit according to claim 2, wherein the first selection unit includes a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, and a sixth resistor; one end of the first resistor is connected with a power supply, the other end of the first resistor, one end of the second resistor and one end of the third resistor are connected with a first signal source input end, the other end of the second resistor is grounded, and the other end of the third resistor is connected with the control module; one end of the fourth resistor is connected with the power supply, the other end of the fourth resistor, one end of the fifth resistor and one end of the sixth resistor are connected with the input end of the first signal source, the other end of the fifth resistor is grounded, and the other end of the sixth resistor is connected with the control module.
5. The indicator light control circuit of claim 4, wherein the second selection unit comprises a seventh resistor, an eighth resistor, and a ninth resistor; one end of the seventh resistor is connected with the power supply, the other end of the seventh resistor and one end of the eighth resistor are both connected with the input end of a second signal source, and the other end of the eighth resistor is connected with the control module; one end of the ninth resistor is connected with the input end of a second signal source, and the other end of the ninth resistor is connected with the control module.
6. The indicator lamp control circuit of claim 3, wherein the first driving unit comprises a tenth resistor and an eleventh resistor, one end of the tenth resistor is connected to the positive polarity driving signal input terminal, one end of the eleventh resistor is connected to the positive polarity driving signal input terminal, and the other end of the tenth resistor and the other end of the eleventh resistor are both connected to the indicator lamp.
7. The indicator lamp control circuit according to claim 3, wherein the second driving unit includes a twelfth resistor and a thirteenth resistor, one end of the twelfth resistor is connected to the negative polarity driving signal input terminal, one end of the thirteenth resistor is connected to the negative polarity driving signal input terminal, and the other end of the twelfth resistor and the other end of the thirteenth resistor are both connected to the indicator lamp.
8. The indicator light control circuit of claim 1, wherein the control module comprises a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a seventeenth resistor, an eighteenth resistor, a nineteenth resistor, a twentieth resistor, a twenty-first resistor, a twenty-second resistor, a twenty-third resistor, a first triode, a second triode, and a third triode;
one end of the fourteenth resistor is connected with the signal source selection module, one end of the fifteenth resistor is connected with the signal source selection module, the other end of the fourteenth resistor and the other end of the fifteenth resistor are both connected with the base electrode of the first triode, the emitter electrode of the first triode is grounded, and the collector electrode of the first triode is connected with one end of the sixteenth resistor, one end of the seventeenth resistor and one end of the eighteenth resistor; the other end of the sixteenth resistor is connected with the driving module, the other end of the seventeenth resistor is connected with the power supply, the other end of the eighteenth resistor, one end of the nineteenth resistor and one end of the twentieth resistor are connected with the base electrode of the second triode, the emitting electrode of the second triode is grounded, the collector electrode of the second triode, one end of the twenty-first resistor and one end of the twenty-second resistor are connected with the driving module, the other end of the twenty-first resistor is connected with the power supply, and the other end of the twenty-second resistor is connected with the driving module; one end of the twenty-third resistor is connected with an emitting electrode of the third triode, the other end of the twenty-third resistor is connected with the driving module, a base electrode of the third triode is connected with the signal source selection module, and a collector electrode of the third triode is grounded;
one end of the fourteenth resistor is connected with the signal source selection module through an LED-BLUE-CRL signal end, one end of the fifteenth resistor is connected with the signal source selection module through an LED-RED-CRL signal end, the other end of the nineteenth resistor is connected with the signal source selection module through an LED-RED-CRL signal end, and the other end of the twentieth resistor is connected with the signal source selection module through an LED-BLUE-CRL signal end.
9. The indicator light control circuit of claim 8, wherein the first transistor and the second transistor are both N-type transistors and the third transistor is a P-type transistor.
10. An electric device comprising a main board and an indicator light, wherein the main board is provided with a main chip and the indicator light control circuit of any one of claims 1 to 9.
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