WO2023221330A1 - Led控制电路及电子设备、电子装置 - Google Patents

Led控制电路及电子设备、电子装置 Download PDF

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Publication number
WO2023221330A1
WO2023221330A1 PCT/CN2022/115852 CN2022115852W WO2023221330A1 WO 2023221330 A1 WO2023221330 A1 WO 2023221330A1 CN 2022115852 W CN2022115852 W CN 2022115852W WO 2023221330 A1 WO2023221330 A1 WO 2023221330A1
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WIPO (PCT)
Prior art keywords
circuit
voltage
led control
terminal
control circuit
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Application number
PCT/CN2022/115852
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English (en)
French (fr)
Inventor
王伟
韩静
Original Assignee
深圳锐盟半导体有限公司
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Publication of WO2023221330A1 publication Critical patent/WO2023221330A1/zh

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Classifications

    • 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
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • H05B45/3725—Switched mode power supply [SMPS]

Definitions

  • the present application belongs to the field of LED circuit technology, and in particular relates to an LED control circuit, electronic equipment, and electronic devices.
  • the relevant LED control circuit transmits instructions through the ground wire to control the LED.
  • the relevant LED control circuit includes a reference circuit, a signal identification circuit and a data decoding circuit; the reference circuit is used to generate a reference voltage and output it to the signal identification circuit; the signal identification circuit generates an internal standard digital signal based on the reference voltage and sends it to the data decoding circuit.
  • the related LED control circuit requires a reference circuit to provide a reference voltage to the signal recognition circuit, the circuit is complex and the hardware cost is high.
  • the purpose of this application is to provide an LED control circuit, electronic equipment, and electronic device, aiming to solve the problem of complex and high-cost LED control circuit maintenance technology.
  • an LED control circuit which has a power terminal, a ground terminal and a plurality of control signal output terminals; the LED control circuit includes:
  • a level identification circuit connected to the power terminal of the LED control circuit and the ground terminal of the LED control circuit, and configured to output a digital signal according to the voltage difference between the voltage of the power terminal and the voltage of the ground terminal;
  • a decoding circuit connected to the level identification circuit and multiple control signal output terminals of the LED control circuit, configured to analyze the digital signal to obtain the control data of the LED control circuit, and according to the control The data outputs a plurality of control signals to the plurality of control signal output terminals.
  • embodiments of the present application also provide an electronic device, which includes a controller and n of the above-mentioned LED control circuits;
  • the power terminal of the first LED control circuit is connected to the positive electrode of the power supply and the power terminal of the controller, the ground terminal of the n-th LED control circuit is connected to the input terminal of the controller, and the i-th LED control circuit is connected to the input terminal of the controller.
  • the ground terminal of the LED control circuit is connected to the power terminal of the i+1th LED control circuit, and the output terminal of the controller is connected to the negative pole of the power supply;
  • the controller is configured to control the input end of the controller and the output end of the controller to be on and off;
  • n is a natural number greater than 1
  • i is a positive integer less than n.
  • embodiments of the present application further provide an electronic device, which includes a DC conversion circuit, a signal transmitting circuit, a first switch circuit, and m LED controls according to any one of claims 1 to 15. circuit;
  • the power terminal of the first LED control circuit is connected to the positive electrode of the power supply, and the ground terminal of the mth LED control circuit is connected to the input terminal of the first switch circuit and the input terminal of the DC conversion circuit.
  • the ground terminal of the jth LED control circuit is connected to the power terminal of the j+1 LED control circuit, and the output terminal of the first switch circuit is connected to the negative pole of the power supply and the ground terminal of the DC conversion circuit,
  • the output end of the signal sending circuit is connected to the control end of the first switching circuit;
  • the signal sending circuit is configured to output a first control signal
  • the first switch circuit is configured to switch on and off according to the first control signal
  • the DC conversion circuit is configured to clamp the voltage of the ground terminal of the m-th LED control circuit when the first switch circuit is turned off;
  • m is a natural number greater than 1
  • j is a positive integer less than m.
  • the beneficial effects of the embodiments of the present application are: because the level identification circuit only outputs a digital signal based on the voltage difference between the voltage of the power supply terminal and the voltage of the ground terminal; therefore, the level identification circuit does not need a reference voltage as a reference signal, so The reference circuit that provides the reference voltage is omitted, simplifying the circuit and saving hardware costs.
  • Figure 1 is a schematic structural diagram of an LED control circuit provided by an embodiment of the present application.
  • FIG. 2 is another structural schematic diagram of an LED control circuit provided by an embodiment of the present application.
  • FIG. 3 is another structural schematic diagram of an LED control circuit provided by an embodiment of the present application.
  • Figure 4 is a schematic structural diagram of a level identification module in an LED control circuit provided by an embodiment of the present application.
  • FIG. 5 is another structural schematic diagram of the level identification module in the LED control circuit provided by an embodiment of the present application.
  • Figure 6 is another schematic structural diagram of an LED control circuit provided by an embodiment of the present application.
  • Figure 7 is a partial example circuit schematic diagram of an LED control circuit provided by an embodiment of the present application.
  • Figure 8 is another partial example circuit schematic diagram of an LED control circuit provided by an embodiment of the present application.
  • Figure 9 is another partial example circuit schematic diagram of an LED control circuit provided by an embodiment of the present application.
  • Figure 10 is another partial example circuit schematic diagram of an LED control circuit provided by an embodiment of the present application.
  • Figure 11 is a schematic structural diagram of an electronic device provided by an embodiment of the present application.
  • Figure 12 is a schematic structural diagram of an electronic device provided by an embodiment of the present application.
  • Figure 13 is another structural schematic diagram of an electronic device provided by an embodiment of the present application.
  • Figure 14 is another structural schematic diagram of an electronic device provided by an embodiment of the present application.
  • Figure 15 is another structural schematic diagram of an electronic device provided by an embodiment of the present application.
  • Figure 16 is another structural schematic diagram of an electronic device provided by an embodiment of the present application.
  • FIG. 17 is a partial example circuit schematic diagram of an electronic device provided by an embodiment of the present application.
  • first and second are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of indicated technical features. Therefore, features defined as “first” and “second” may explicitly or implicitly include one or more of these features.
  • plurality means two or more than two, unless otherwise explicitly and specifically limited.
  • FIG. 1 shows a schematic structural diagram of an LED control circuit provided by a preferred embodiment of the present application. For ease of explanation, only the parts related to this embodiment are shown. The details are as follows:
  • the above-mentioned LED control circuit has a power terminal VDD, a ground terminal GND, and multiple control signal output terminals OUT; the LED control circuit includes a level identification circuit 11 and a decoding circuit 12 .
  • the level identification circuit 11 is connected to the power terminal VDD of the LED control circuit and the ground terminal GND of the LED control circuit, and is configured to output a digital signal according to the voltage difference between the voltage of the power terminal VDD and the ground terminal GND.
  • the decoding circuit 12 is connected to the level identification circuit 11 and multiple control signal output terminals of the LED control circuit, and is configured to analyze the digital signal to obtain the control data of the LED control circuit, and output multiple control signals according to the control data. to multiple control signal output terminals OUT.
  • the above-mentioned LED control circuit also includes a digital filter circuit 13.
  • the digital filter circuit 13 is connected between the level identification circuit 11 and the decoding circuit 12, and is configured to digitally filter the digital signal.
  • the decoding circuit 12 is specifically configured to analyze the digital filtered digital signal to obtain the control data of the LED control circuit, and output multiple control signals to multiple control signal output terminals according to the control data.
  • the bit error rate of the digital signal is reduced and the stability of the LED control circuit is improved.
  • digital filter circuit 13 and the decoding circuit 12 can be reset according to the same reset signal and work according to the same clock signal.
  • a plurality of control signal OUT output terminals of the above-mentioned LED control circuit are connected to the driving circuit 20 .
  • the driving circuit 20 is configured to output a plurality of driving signals according to a plurality of control signals to cause the plurality of light-emitting components 30 to emit light.
  • the level identification circuit 11 includes a voltage dividing circuit 111 , a voltage reducing circuit 112 and a first comparison circuit 113 .
  • the voltage dividing circuit 111 is connected to the power terminal VDD of the LED control circuit and the ground terminal GND of the LED control circuit, and is configured to divide the voltage difference between the voltage of the power terminal VDD and the ground terminal GND to output a first voltage.
  • the voltage-reducing circuit 112 is connected to the power terminal VDD of the LED control circuit and the ground terminal GND of the LED control circuit, and is configured to drop the voltage of the power terminal by a preset value to output the second voltage.
  • the first comparison circuit 113 is connected to the decoding circuit 12, the voltage dividing circuit 111 and the voltage reducing circuit 112, and is configured to compare the first voltage and the second voltage, and output a digital signal according to the comparison result.
  • the voltage dividing circuit 111, the voltage reducing circuit 112 and the first comparison circuit 113 Through the voltage dividing circuit 111, the voltage reducing circuit 112 and the first comparison circuit 113, the change in the voltage difference between the voltage of the power supply terminal VDD and the voltage of the ground terminal GND is identified, so that there is no need for a reference voltage as a reference signal, so providing a reference voltage is omitted.
  • the reference circuit simplifies the circuit and saves hardware costs. And because the voltage dividing circuit can be adjusted in a wide range, it can adapt to a larger voltage difference between the voltage of the power supply terminal VDD and the ground terminal GND, which expands the application range of the LED control circuit.
  • the level identification circuit 11 includes a first level shift circuit 114 , a second level shift circuit 115 and a second comparison circuit 116 .
  • the first level shift circuit 114 is connected to the power terminal VDD of the LED control circuit and the ground terminal GND of the LED control circuit, and is configured to level shift the voltage of the ground terminal GND to output a third voltage.
  • the second level shift circuit 115 is connected to the power terminal VDD of the LED control circuit and the ground terminal GND of the LED control circuit, and is configured to level shift the voltage of the power terminal VDD to output a fourth voltage.
  • the second comparison circuit 116 is connected to the decoding circuit 12, the first level shift circuit 114 and the second level shift circuit 115, and is configured to compare the third voltage and the fourth voltage, and based on the comparison result.
  • the first level shift circuit 114, the second level shift circuit 115 and the second comparison circuit 116 identify the voltage difference between the voltage at the power supply terminal and the voltage at the ground terminal to output a digital signal. Since the level shift circuit uses diodes or field effect transistors, that is, It can be realized without setting resistors, so the layout area is reduced.
  • the decoding circuit 12 can also provide power according to the voltage difference between the voltage of the power terminal VDD and the ground terminal GND. As shown in FIG. 6 , the LED control circuit also includes a shunt circuit 14 .
  • the shunt circuit 14 is connected between the power supply terminal VDD and the ground terminal GND, and is configured to shunt the current between the power supply terminal VDD and the ground terminal GND.
  • the shunt circuit 14 shunts the current between the power supply terminal VDD and the ground terminal GND, the supply voltage of each LED control circuit connected in series (that is, the power supply terminal VDD of each LED control circuit and the ground terminal GND of each LED control circuit) is adjusted. voltage) to prevent damage to ground components caused by overvoltage of the supply voltage of the LED control circuit.
  • Figure 7 shows a partial example circuit structure of the LED control circuit provided by the embodiment of the present application.
  • Figure 8 shows another partial example circuit structure of the LED control circuit provided by the embodiment of the present application.
  • Figure 9 shows Another partial example circuit structure of the LED control circuit provided by the embodiment of the present application.
  • Figure 10 shows another partial example circuit structure of the LED control circuit provided by the embodiment of the present application.
  • the buck circuit 112 includes a first field effect transistor M1 and a first current source I1.
  • the source of the first field effect transistor M1 is connected to the power supply terminal VDD of the LED control circuit.
  • the output terminal of the first current source I1 is connected to the ground terminal GND of the LED control circuit.
  • the drain of the first field effect transistor M1 and the first field effect transistor M1 The gate of the tube M1 and the input terminal of the first current source I1 together serve as the second voltage output terminal of the buck circuit 112 and are connected to the first comparison circuit 113 to output the second voltage.
  • the drain of the first field effect transistor M1 and the gate of the first field effect transistor M1 are connected to the comparison circuit 113 to achieve The voltage drop to the first preset value of the voltage of the power terminal VDD of the LED control circuit is determined.
  • the buck circuit 112 includes a first diode D1 and a second current source I2.
  • the anode of the first diode D1 is connected to the power terminal VDD of the LED control circuit, the output terminal of the second current source I2 is connected to the ground terminal GND of the LED control circuit, and the cathode of the first diode D1 is connected to the first current source I1
  • the input terminals together serve as the second voltage output terminal of the buck circuit 112 and are connected with the first comparison circuit 113 to output the second voltage.
  • the voltage dividing circuit 111 includes a first resistor R1 and a second resistor R2.
  • the first terminal of the first resistor R1 is connected to the power terminal VDD of the LED control circuit.
  • the first terminal of the second resistor R2 is connected to the ground terminal GND of the LED control circuit.
  • the second terminal of the first resistor R1 and the second terminal of the second resistor R2 are connected.
  • the second terminal serves as the first voltage output terminal of the voltage dividing circuit 111 and is connected with the first comparison circuit 113 to output the first voltage.
  • the voltage dividing circuit 111 is simple and reliable.
  • the non-inverting input end of the first comparator U1 serves as the second voltage input end of the first comparison circuit 113, and is connected to the buck circuit 112 to access the second voltage;
  • the first comparator The inverting input terminal of U1 serves as the first voltage input terminal of the first comparison circuit 113 and is connected to the voltage dividing circuit 111 to access the first voltage;
  • the output terminal of the first comparator U1 serves as the digital signal of the first comparison circuit 113
  • the output terminal is connected to the decoding circuit 12 to output a digital signal.
  • the first comparison circuit 113 has a simple and reliable structure.
  • the first level shift circuit 114 includes a second field effect transistor M2 and a second current source I2.
  • the first terminal of the second current source I2 is connected to the power terminal VDD of the LED control circuit.
  • the source of the second field effect transistor M2 is connected to the ground terminal GND of the LED control circuit.
  • the second terminal and the second terminal of the second current source I2 are connected to the ground terminal GND of the LED control circuit.
  • the gate of the field effect transistor M2 and the drain of the second field effect transistor M2 together serve as the third voltage output terminal of the first level shift circuit 114 and are connected to the second comparison circuit 116 to output the third voltage.
  • the gate of the second field effect transistor M2 and the drain of the second field effect transistor M2 are connected and then connected to the second comparison circuit. 116. Implement an upward level shift to the second preset value of the voltage of the ground terminal GND of the LED control circuit.
  • the second level shift circuit 115 includes a third field effect transistor M3 and a fourth current source I4.
  • the source of the third field effect transistor M3 is connected to the power terminal VDD of the LED control circuit.
  • the output terminal of the fourth current source I4 is connected to the ground terminal GND of the LED control circuit.
  • the drain of the third field effect transistor M3 and the third field effect transistor M3 The gate of the effect transistor M3 and the input terminal of the fourth current source I4 together serve as the fourth voltage output terminal of the second level shift circuit 115 and are connected to the second comparison circuit 116 to output the fourth voltage.
  • the comparison circuit 116 implements a downward level shift of the third preset value of the voltage of the power supply terminal VDD of the LED control circuit.
  • the first level shift circuit 114 includes a second diode D2 and a third current source I3.
  • the first terminal of the third current source I3 is connected to the power terminal VDD of the LED control circuit.
  • the cathode of the second diode D2 is connected to the ground terminal GND of the LED control circuit.
  • the second terminal of the third current source I3 and the second terminal of the second diode D2 are connected to the ground terminal GND of the LED control circuit.
  • the anode of the transistor D2 serves as the third voltage output terminal of the first level shift circuit 114 and is connected to the second comparison circuit 116 to output the third voltage.
  • the cathode of the second diode D2 By connecting the cathode of the second diode D2 to the ground terminal GND of the LED control circuit and the anode of the second diode D2 to the second comparison circuit 116, the voltage of the ground terminal GND of the LED control circuit is controlled. Upward level shift of the second preset value.
  • the second level shift circuit 115 includes a third diode D3 and a fifth current source I5.
  • the anode of the third diode D3 is connected to the power terminal VDD of the LED control circuit, the output terminal of the fifth current source I5 is connected to the ground terminal GND of the LED control circuit, and the cathode of the third diode D3 is connected to the fifth current source I5
  • the input terminals together serve as the fourth voltage output terminal of the second level shift circuit 115 and are connected with the second comparison circuit 116 to output the fourth voltage.
  • the voltage of the power supply terminal VDD of the LED control circuit is controlled. Downward level shift of the third preset value.
  • the second comparison circuit 116 includes a second comparator U2.
  • the non-inverting input terminal of the second comparator U2 serves as the fourth voltage input terminal of the second comparison circuit 116 and is connected to the second level shift circuit 115 to access the fourth voltage; the inverting input terminal of the second comparator U2 As the third voltage input terminal of the second comparison circuit 116, it is connected to the first level shift circuit 114 to access the third voltage; the output terminal of the second comparator U2 serves as the digital signal output terminal of the second comparison circuit 116, Connected to the decoding circuit 12 to output digital signals.
  • the driving circuit 20 includes fourth to sixth field effect transistors M4 to M6.
  • the shunt circuit 14 includes a shunt resistor Rs.
  • the first resistor R1 and the second resistor R2 divide the voltage difference between the voltage of the power terminal VDD and the voltage of the ground terminal GND to output a first voltage to the inverting input terminal of the comparator U1 .
  • the field effect transistor M1 performs a preset voltage drop on the voltage of the power supply terminal VDD to output a second voltage to the non-inverting input terminal of the first comparator U1 .
  • the diode D1 performs a preset voltage drop on the voltage of the power supply terminal VDD to output a second voltage to the non-inverting input terminal of the first comparator U1 .
  • the first comparator U1 compares the first voltage and the second voltage, and outputs a digital signal according to the comparison result; the digital filter circuit 13 performs digital filtering on the digital signal.
  • the decoding circuit 12 analyzes the digital filtered digital signal to obtain the control data of the LED control circuit, and outputs multiple control signals to multiple control signal output terminals according to the control data. Multiple control signals are connected from the gate of the fourth field effect transistor M4 to the gate of the sixth field effect transistor M6, and multiple control signals are output from the drain of the fourth field effect transistor M4 to the drain of the sixth field effect transistor M6.
  • the driving signal is used to cause the plurality of light-emitting components 30 (such as the light-emitting diodes LED1 to LED3) to emit light.
  • the first comparator U1, the digital filter circuit 13 and the decoding circuit 12 are all powered according to the voltage difference between the voltage of the power supply terminal VDD and the ground terminal GND.
  • the shunt resistor Rs supplies power to the power supply terminal VDD and the ground terminal GND. The current flows between them.
  • the second field effect transistor M2 performs a level shift on the voltage of the ground terminal GND to output a third voltage to the inverting input terminal of the second comparator U2 .
  • the third field effect transistor M3 performs a level shift on the voltage of the power supply terminal VDD to output a fourth voltage to the non-inverting input terminal of the second comparator U2.
  • the second diode D2 performs a level shift on the voltage of the ground terminal GND to output a third voltage to the inverting input terminal of the second comparator U2 .
  • the third diode D3 performs a level shift on the voltage of the power supply terminal VDD to output a fourth voltage to the non-inverting input terminal of the second comparator U2.
  • the second comparator U2 compares the third voltage and the fourth voltage, and outputs a digital signal according to the comparison result; the digital filter circuit 13 performs digital filtering on the digital signal.
  • the decoding circuit 12 analyzes the digital filtered digital signal to obtain the control data of the LED control circuit, and outputs multiple control signals to multiple control signal output terminals according to the control data. Multiple control signals are connected from the gate of the fourth field effect transistor M4 to the gate of the sixth field effect transistor M6, and multiple control signals are output from the drain of the fourth field effect transistor M4 to the drain of the sixth field effect transistor M6.
  • the driving signal is used to cause the plurality of light-emitting components 30 (such as the light-emitting diodes LED1 to LED3) to emit light.
  • the second comparator U2, the digital filter circuit 13 and the decoding circuit 12 are all powered according to the voltage difference between the voltage of the power supply terminal VDD and the ground terminal GND.
  • the shunt resistor RS supplies power to the power supply terminal VDD and the ground terminal GND. The current flows between them.
  • the electronic device includes a controller 100 and n LED control circuits 10 as described above; the power terminal of the first LED control circuit 10 and the positive electrode of the power supply and the controller
  • the power terminal of 100 is connected, the ground terminal of the n-th LED control circuit 10 is connected to the input terminal of the controller 100, the ground terminal of the i-th LED control circuit 10 is connected to the power terminal of the i+1-th LED control circuit 10,
  • the output terminal of the controller 100 is connected to the negative pole of the power supply; the controller 100 is configured to control the input terminal of the controller 100 and the output terminal of the controller 100 to be on and off; where n is a natural number greater than 1, and i is a positive integer less than n.
  • the controller 100 controls the input terminal of the controller 100 and the output terminal of the controller 100 to be disconnected, the positive pole of the power supply is connected to the negative pole of the power supply through n LED control circuits 10 as mentioned above.
  • the first voltage output by the voltage divider circuit is the voltage of the positive pole of the power supply, and the second voltage output by the buck circuit has received one or more voltage drops, so the first voltage is greater than the second voltage, and the digital signal is low level; when When the controller 100 controls the input terminal of the controller 100 and the output terminal of the controller 100 to be connected, the positive electrode of the power supply is connected to the negative electrode of the power supply through n LED control circuits 10 as mentioned above.
  • the first voltage output by the voltage-reducing circuit is the voltage obtained by dividing the voltage difference between the voltage at the power supply terminal and the voltage at the ground terminal, and the second voltage output by the voltage-reducing circuit reduces the voltage at the power supply terminal by a preset value.
  • the first voltage is smaller than the second voltage, and the digital signal is at a high level; thereby realizing the ground wire transmission command to control the LED.
  • the electronic device includes a DC conversion circuit 90, a signal transmitting circuit 80, a first switch circuit 60 and m LED control circuits 10 as described above; the first LED
  • the power terminal of the control circuit 10 is connected to the positive electrode of the power supply
  • the ground terminal of the m-th LED control circuit 10 is connected to the input terminal of the first switch circuit 60 and the input terminal of the DC conversion circuit 90
  • the ground terminal of the j-th LED control circuit 10 The terminal is connected to the power terminal of the j+1th LED control circuit 10
  • the output terminal of the first switch circuit 60 is connected to the negative pole of the power supply and the ground terminal of the DC conversion circuit 90
  • the output terminal of the signal sending circuit 80 is connected to the first switch circuit 60 of the console connection.
  • the signal sending circuit 80 is configured to output a first control signal; the first switch circuit 60 is configured to switch on and off according to the first control signal; the DC conversion circuit 90 is configured to control the mth LED control circuit when the one-way conduction circuit is one-way conduction. The voltage at the ground terminal is clamped; where m is a natural number greater than 1, and j is a positive integer less than m.
  • the DC conversion circuit 90 clamps the voltage of the ground terminal of the m-th LED control circuit 10, so in each LED control circuit 10, the voltage of the power terminal and the ground The voltage difference between terminals is less than the preset voltage.
  • the first voltage output by the voltage divider circuit is less than the second voltage output by the buck circuit, and the digital signal is high level; when the first switch circuit 60 is configured to operate according to the first control When the signal is turned on, the voltage of the ground terminal of the m-th LED control circuit 10 is connected to the negative electrode of the power supply. Therefore, in each LED control circuit 10, the voltage difference between the voltage of the power supply terminal and the ground terminal is greater than the preset voltage.
  • the voltage dividing circuit The first voltage output is greater than the second voltage output by the buck circuit, and the digital signal is low level; thereby realizing the ground wire transmission command to realize the control of the LED.
  • the DC conversion circuit 90 clamps the voltage of the ground terminal of the m-th LED control circuit 10, so in each LED control circuit 10, the voltage of the power terminal and the ground The voltage difference between terminals is less than the preset voltage.
  • the third voltage output by the first potential translation circuit is less than the fourth voltage output by the second potential translation circuit, and the digital signal is high level;
  • the first switch circuit 60 is configured as When the first control signal is turned on, the voltage of the ground terminal of the m-th LED control circuit 10 is connected to the negative electrode of the power supply. Therefore, in each LED control circuit 10, the voltage difference between the voltage of the power supply terminal and the ground terminal is greater than the preset voltage.
  • the third voltage output by the first potential shift circuit is greater than the fourth voltage output by the second potential shift circuit, and the digital signal is low level; thereby realizing the ground wire transmission command to realize the control of the LED.
  • the electronic device further includes a second switch circuit 701 .
  • the ground terminal of the m-th LED control circuit 10 is connected to the input terminal of the first switch circuit 60 and the input terminal of the second switch circuit 701, and the output terminal of the second switch circuit 701 is connected to the input terminal of the DC conversion circuit 90; signal transmission
  • the circuit 80 is also configured to output a second control signal; the second switch circuit 701 is configured to conduct according to the second control signal to transfer the voltage of the ground terminal of the m-th LED control circuit 10 when the first switch circuit 60 is turned off.
  • the DC conversion circuit 90 is specifically configured to clamp the voltage of the ground terminal of the m-th LED control circuit 10 when the second switch circuit 701 is turned on.
  • the second switch circuit 701 By providing the second switch circuit 701, when the first switch circuit 60 is configured to be turned on according to the first control signal, the second switch circuit 701 stops working, and the voltage of the ground terminal of the m-th LED control circuit 10 is connected to the negative pole of the power supply to avoid The voltage of the ground terminal of the m-th LED control circuit 10 is connected to the DC conversion circuit 90 to prevent the DC conversion circuit 90 from affecting the voltage of the ground terminal of the m-th LED control circuit 10 and improve the stability and reliability of the system.
  • the electronic device further includes a one-way conduction circuit 702 .
  • the ground terminal of the mth LED control circuit 10 is connected to the input terminal of the first switch circuit 60 and the input terminal of the one-way conduction circuit 702 , and the output terminal of the one-way conduction circuit 702 is connected to the input terminal of the DC conversion circuit 90 .
  • the one-way conducting circuit 702 is configured to unidirectionally conduct the voltage of the ground terminal of the m-th LED control circuit 10 when the first switch circuit 60 is turned off.
  • the DC conversion circuit 90 is specifically configured to clamp the voltage of the ground terminal of the m-th LED control circuit 10 when the one-way conduction circuit 702 is conductive in one direction.
  • the one-way conduction circuit 702 stops working, and the voltage of the ground terminal of the m-th LED control circuit 10 is connected to the negative pole of the power supply to avoid The voltage of the ground terminal of the m-th LED control circuit 10 is connected to the DC conversion circuit 90 to prevent the DC conversion circuit 90 from affecting the voltage of the ground terminal of the m-th LED control circuit 10 and improve the stability and reliability of the system.
  • the one-way conduction circuit 702 conducts the voltage of the ground terminal of the m-th LED control circuit 10 in one direction, and the DC conversion circuit 90 controls the voltage of the ground terminal of the m-th LED control circuit 10 .
  • the voltage at the ground terminal is clamped, so in each LED control circuit 10, the voltage difference between the voltage at the power terminal and the ground terminal is less than the preset voltage.
  • the first voltage output by the voltage dividing circuit is less than the second voltage output by the buck circuit.
  • the digital signal is high level; when the first switch circuit 60 is configured to be turned on according to the first control signal, the one-way conduction circuit 702 stops working, and the voltage of the ground terminal of the m-th LED control circuit 10 is connected to the negative pole of the power supply, so In each LED control circuit 10, the voltage difference between the voltage at the power supply terminal and the voltage at the ground terminal is greater than the preset voltage. At this time, the first voltage output by the voltage dividing circuit is greater than the second voltage output by the buck circuit, and the digital signal is low level; Thus, the ground wire transmission command is realized to realize the control of LED.
  • the one-way conduction circuit 702 conducts the voltage of the ground terminal of the m-th LED control circuit 10 in one direction, and the DC conversion circuit 90 controls the voltage of the ground terminal of the m-th LED control circuit 10 .
  • the voltage at the ground terminal is clamped, so in each LED control circuit 10, the voltage difference between the power terminal voltage and the ground terminal voltage is less than the preset voltage.
  • the third voltage output by the first potential translation circuit is less than the output of the second potential translation circuit.
  • the fourth voltage, the digital signal is high level; when the first switch circuit 60 is configured to be turned on according to the first control signal, the one-way conduction circuit 702 stops working, and the voltage of the ground terminal of the m-th LED control circuit 10 is connected to Therefore, in each LED control circuit 10, the voltage difference between the voltage at the power terminal and the ground terminal is greater than the preset voltage. At this time, the third voltage output by the first potential shift circuit is greater than the fourth voltage output by the second potential shift circuit. , the digital signal is low level; thus realizing the ground wire transmission command to realize the control of LED.
  • the electronic device further includes one or more groups of LED control circuits 10; wherein each group of LED control circuits includes m of the above-mentioned LED control circuits 10 connected in series.
  • the above-mentioned electronic device also includes a protection circuit 50.
  • the protection circuit 50 is connected between the power terminal of the first LED control circuit 10 and the ground terminal of the m-th LED control circuit 10, and is configured to filter out the power terminal of the first LED control circuit 10 and the m-th LED control circuit. 10 spikes in the voltage between ground terminals.
  • the DC conversion circuit 90 is also connected to the signal transmitting circuit 80 and is configured to output an internal supply voltage according to the voltage of the ground terminal GND of the m-th LED control circuit to power the signal transmitting circuit 80 .
  • the DC conversion circuit 90 includes a third resistor R3, a fourth resistor R4 and a first voltage regulator tube Z1; the first end of the third resistor R3 serves as the voltage input end of the DC conversion circuit 90, and is connected to a single Connect to the conduction circuit 70 to access the voltage of the ground terminal GND of the m-th LED control circuit; the second end of the third resistor R3, the first end of the fourth resistor R4 and the cathode of the first voltage regulator Z1 share a direct current.
  • the internal power supply voltage output end of the conversion circuit 90 is connected to the signal sending circuit 80 to output the internal power supply voltage; the second end of the fourth resistor R4 and the positive electrode of the first voltage regulator tube Z1 are commonly connected to the negative electrode of the power supply.
  • the signal sending circuit 80 includes a microprocessor U3; the power terminal VCC of the microprocessor U3 serves as the internal supply voltage input terminal of the signal sending circuit 80 and is connected to the DC conversion circuit 90 to access the internal supply voltage;
  • the first general-purpose input and output terminal P1.0 of the microprocessor U3 serves as the first control signal output terminal of the signal sending circuit 80 and is connected with the first switch circuit 60 to output the first control voltage;
  • the ground terminal GND of the microprocessor U3 Connect to the negative pole of the power supply.
  • the first switching circuit 60 includes a switching transistor Q1.
  • the one-way conducting circuit 70 includes a second diode D4.
  • the protection circuit 50 includes a second voltage regulator tube Z2.
  • the embodiment of the present application has a power supply terminal, a ground terminal and multiple control signal output terminals through the LED control circuit; and the level identification circuit outputs a digital signal according to the voltage difference between the voltage of the power supply terminal and the voltage of the ground terminal; and the decoding circuit analyzes the digital signal.
  • the level identification circuit To obtain the control data of the LED control circuit, and output multiple control signals to the multiple control signal output terminals according to the control data. Since the level identification circuit only outputs a digital signal based on the voltage difference between the voltage at the power supply terminal and the voltage at the ground terminal, the level identification circuit does not need a reference voltage as a reference signal, so the reference circuit that provides the reference voltage is omitted, simplifying the circuit and saving hardware. cost.

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Abstract

一种LED控制电路及电子设备、电子装置，属于LED电路技术领域，通过LED控制电路具有电源端、接地端以及多个控制信号输出端；且电平识别电路11根据电源端的电压和接地端的电压的压差输出数字信号；译码电路12对数字信号进行解析以得到本LED控制电路的控制数据，并根据控制数据输出多个控制信号至多个控制信号输出端。由于电平识别电路11仅根据电源端的电压和接地端的电压的压差输出数字信号；从而电平识别电路11无需基准电压作为参考信号，故省略了提供基准电压的基准电路，简化了电路并节约了硬件成本。

Description

LED控制电路及电子设备、电子装置
本申请要求于2022年05月17日在中国专利局提交的、申请号为202221185437.3、发明名称为“LED控制电路及电子设备、电子装置”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请属于LED电路技术领域，尤其涉及一种LED控制电路及电子设备、电子装置。
 背景技术
目前，要控制LED的各种状态，如渐变和爆白等，需要通过信号线对LED控制电路传输指令。为省掉信号线、减少成本以及降低系统复杂度，相关的LED控制电路通过地线传输指令以实现LED的控制。
相关的LED控制电路，包括基准电路、信号识别电路以及数据解码电路；基准电路用于产生基准电压并输出至信号识别电路；信号识别电路根据基准电压产生内部标准数字信号并向数据解码电路发送。
由于相关的LED控制电路需要基准电路提供基准电压给信号识别电路，故导致电路复杂以及硬件成本较高。
 技术问题
本申请的目的在于提供一种LED控制电路及电子设备、电子装置，旨在解决相关的LED控制电路维护技术复杂且成本较高的问题。
 技术解决方案
为解决上述技术问题，本申请实施例采用的技术方案是：
第一方面，提供了一种LED控制电路，具有电源端、接地端以及多个控制信号输出端；所述LED控制电路包括：
电平识别电路，与所述LED控制电路的电源端和所述LED控制电路的接地端连接，配置为根据所述电源端的电压和所述接地端的电压的压差输出数字信号；
译码电路，与所述电平识别电路和所述LED控制电路的多个控制信号输出端连接，配置为对所述数字信号进行解析以得到本LED控制电路的控制数据，并根据所述控制数据输出多个控制信号至所述多个控制信号输出端。
第二方面，本申请实施例还提供了一种电子装置，所述电子装置包括控制器和n个上述的LED控制电路；
第1个所述LED控制电路的电源端与电源正极和所述控制器的电源端连接，第n个所述LED控制电路的接地端与所述控制器的输入端连接，所述第i个所述LED控制电路的接地端与所述第i+1个所述LED控制电路的电源端连接，所述控制器的输出端与电源负极连接；
所述控制器配置为控制所述控制器的输入端和所述控制器的输出端通断；
其中，n为大于1的自然数，i为小于n的正整数。
第三方面，本申请实施例还提供了一种电子设备，所述电子设备包括直流转换电路、信号发送电路、第一开关电路以及m个如权利要求1至15任意一项所述的LED控制电路；
第1个所述LED控制电路的电源端与电源正极连接，第m个所述LED控制电路的接地端与所述第一开关电路的输入端和所述直流转换电路的输入端连接，所述第j个所述LED控制电路的接地端与所述第j+1个所述LED控制电路的电源端连接，所述第一开关电路的输出端与电源负极和直流转换电路的接地端连接，所述信号发送电路的输出端与所述第一开关电路的控制端连接；
所述信号发送电路配置为输出第一控制信号；
所述第一开关电路配置为根据所述第一控制信号通断；
所述直流转换电路配置为当所述第一开关电路断开时，对第m个所述LED控制电路的接地端的电压进行钳位；
其中，m为大于1的自然数，j为小于m的正整数。
 有益效果
本申请实施例与现有技术相比存在的有益效果是：由于电平识别电路仅根据电源端的电压和接地端的电压的压差输出数字信号；从而电平识别电路无需基准电压作为参考信号，故省略了提供基准电压的基准电路，简化了电路并节约了硬件成本。
 附图说明
为了更清楚地说明本申请实施例中的技术发明，下面将对实施例描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本申请的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1为本申请一实施例提供的LED控制电路的一种结构示意图；
图2为本申请一实施例提供的LED控制电路的另一种结构示意图；
图3为本申请一实施例提供的LED控制电路的另一种结构示意图；
图4为本申请一实施例提供的LED控制电路中电平识别模块的一种结构示意图；
图5为本申请一实施例提供的LED控制电路中电平识别模块的另一种结构示意图；
图6本申请一实施例提供的LED控制电路的另一种结构示意图；
图7为本申请一实施例提供的LED控制电路的一种部分示例电路原理图；
图8为本申请一实施例提供的LED控制电路的另一种部分示例电路原理图；
图9为本申请一实施例提供的LED控制电路的另一种部分示例电路原理图；
图10为本申请一实施例提供的LED控制电路的另一种部分示例电路原理图；
图11为本申请一实施例提供的电子装置的一种结构示意图；
图12为本申请一实施例提供的电子设备的一种结构示意图；
图13为本申请一实施例提供的电子设备的另一种结构示意图；
图14为本申请一实施例提供的电子设备的另一种结构示意图；
图15为本申请一实施例提供的电子设备的另一种结构示意图；
图16为本申请一实施例提供的电子设备的另一种结构示意图；
图17为本申请一实施例提供的电子设备的一种部分示例电路原理图。
 本发明的实施方式
为了使本申请所要解决的技术问题、技术方案及有益效果更加清楚明白，以下结合附图及实施例，对本申请进行进一步详细说明。应当理解，此处所描述的具体实施例仅仅用以解释本申请，并不用于限定本申请。
需要说明的是，当元件被称为“固定于”或“设置于”另一个元件，它可以直接在另一个元件上或者间接在该另一个元件上。当一个元件被称为是“连接于”另一个元件，它可以是直接连接到另一个元件或间接连接至该另一个元件上。
需要理解的是，术语“长度”、“宽度”、“上”、“下”、“前”、“后”、“左”、“右”、“竖直”、“水平”、“顶”、“底”“内”、“外”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本申请和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本申请的限制。
此外，术语“第一”、“第二”仅用于描述目的，而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量。由此，限定有“第一”、“第二”的特征可以明示或者隐含地包括一个或者更多个该特征。在本申请的描述中，“多个”的含义是两个或两个以上，除非另有明确具体的限定。
图1示出了本申请较佳实施例提供的LED控制电路的结构示意图，为了便于说明，仅示出了与本实施例相关的部分，详述如下：
上述LED控制电路具有电源端VDD、接地端GND以及多个控制信号输出端OUT；LED控制电路包括电平识别电路11和译码电路12。
电平识别电路11，与LED控制电路的电源端VDD和LED控制电路的接地端GND连接，配置为根据电源端VDD的电压和接地端GND的电压的压差输出数字信号。
译码电路12，与电平识别电路11和LED控制电路的多个控制信号输出端连接，配置为对数字信号进行解析以得到本LED控制电路的控制数据，并根据控制数据输出多个控制信号至多个控制信号输出端OUT。
如图2所示，上述LED控制电路还包括数字滤波电路13。
数字滤波电路13，连接在电平识别电路11和译码电路12之间，配置为对数字信号进行数字滤波。
译码电路12具体配置为对数字滤波后的数字信号进行解析以得到本LED控制电路的控制数据，并根据控制数据输出多个控制信号至多个控制信号输出端。
通过对数字信号进行数字滤波，降低了数字信号的误码率，提高了LED控制电路的稳定性。
需要说明的是，数字滤波电路13和译码电路12可以根据同一复位信号进行复位，并根据同一时钟信号进行工作。
如图3所示，上述LED控制电路的多个控制信号OUT输出端与驱动电路20连接。
驱动电路20配置为根据多个控制信号输出多个驱动信号，以使多个发光组件30发光。
作为示例而非限定，如图4所示，电平识别电路11包括分压电路111、降压电路112和第一比较电路113。
分压电路111，与LED控制电路的电源端VDD和LED控制电路的接地端GND连接，配置为对电源端VDD的电压和接地端GND的电压的压差进行分压以输出第一电压。
降压电路112，与LED控制电路的电源端VDD和LED控制电路的接地端GND连接，配置为对电源端的电压进行预设值的压降以输出第二电压。
第一比较电路113，与译码电路12、分压电路111和降压电路112连接，配置为对第一电压和第二电压进行比较，并根据比较结果输出数字信号。
通过分压电路111、降压电路112和第一比较电路113，识别出电源端VDD的电压和接地端GND的电压的压差的变化，从而无需基准电压作为参考信号，故省略了提供基准电压的基准电路，简化了电路并节约了硬件成本。且由于分压电路可以大范围调节，故可以适应较大的电源端VDD的电压和接地端GND的电压的压差，扩展了LED控制电路的应用范围。
作为示例而非限定，如图5所示，所述电平识别电路11包括第一电平位移电路114、第二电平位移电路115以及第二比较电路116。
第一电平位移电路114，与LED控制电路的电源端VDD和LED控制电路的接地端GND连接，配置为对接地端GND的电压进行电平位移以输出第三电压。
第二电平位移电路115，与LED控制电路的电源端VDD和LED控制电路的接地端GND连接，配置为对电源端VDD的电压进行电平位移以输出第四电压。
第二比较电路116，与译码电路12、第一电平位移电路114和第二电平位移电路115连接，配置为对第三电压和第四电压进行比较，并根据比较结果。
通过第一电平位移电路114、第二电平位移电路115以及第二比较电路116识别电源端的电压和接地端的电压的压差以输出数字信号，由于电平位移电路使用二极管或场效应管即可实现，无需设置电阻，故减小了版图面积。
需要强调的是，译码电路12还可以根据电源端VDD的电压和接地端GND的电压的压差进行供电，如图6所示， LED控制电路还包括分流电路14。
分流电路14，连接在电源端VDD和接地端GND之间，配置为对电源端VDD和接地端GND之间的电流进行分流。
由于分流电路14，对电源端VDD和接地端GND之间的电流进行分流，调节了串联的各个LED控制电路的供电电压（即各个LED控制电路的电源端VDD和各个LED控制电路的接地端GND之间的电压），防止了LED控制电路的供电电压的过压导致地器件损坏。
图7示出了本申请实施例提供的LED控制电路的一种部分示例电路结构，图8示出了本申请实施例提供的LED控制电路的另一种部分示例电路结构，图9示出了本申请实施例提供的LED控制电路的另一种部分示例电路结构，图10示出了本申请实施例提供的LED控制电路的另一种部分示例电路结构。为了便于说明，仅示出了与本申请实施例相关的部分，详述如下：
如图7所示，降压电路112包括第一场效应管M1和第一电流源I1。
第一场效应管M1源极与LED控制电路的电源端VDD连接，第一电流源I1的输出端与LED控制电路的接地端GND连接，第一场效应管M1的漏极、第一场效应管M1的栅极以及第一电流源I1的输入端共同作为降压电路112的第二电压输出端，与第一比较电路113连接，以输出第二电压。
通过将第一场效应管M1源极与LED控制电路的电源端VDD连接，第一场效应管M1的漏极和第一场效应管M1的栅极连接后在接入至比较电路113，实现了对LED控制电路的电源端VDD的电压的第一预设值的压降。
如图8所示，降压电路112包括第一二极管D1和第二电流源I2。
第一二极管D1的正极与LED控制电路的电源端VDD连接，第二电流源I2的输出端与LED控制电路的接地端GND连接，第一二极管D1的负极以及第一电流源I1的输入端共同作为降压电路112的第二电压输出端，与第一比较电路113连接，以输出第二电压。
通过将第一二极管D1的正极与LED控制电路的电源端VDD连接，第一二极管的负极接入至第一比较电路113，实现了对LED控制电路的电源端VDD的电压的第一预设值的压降。
如图7和图8所示，分压电路111包括第一电阻R1和第二电阻R2。
第一电阻R1的第一端与LED控制电路的电源端VDD连接，第二电阻R2的第一端与LED控制电路的接地端GND连接，第一电阻R1的第二端和第二电阻R2的第二端共同作为分压电路111的第一电压输出端，与第一比较电路113连接，以输出第一电压。
该分压电路111简单可靠。
如图7和图8所示，第一比较器U1的正相输入端作为第一比较电路113的第二电压输入端，与降压电路112连接，以接入第二电压；第一比较器U1的反相输入端作为第一比较电路113的第一电压输入端，与分压电路111连接，以接入第一电压；第一比较器U1的输出端作为第一比较电路113的数字信号输出端，与译码电路12连接，以输出数字信号。
该第一比较电路113结构简单可靠。
如图9所示，第一电平位移电路114包括第二场效应管M2和第二电流源I2。
第二电流源I2的第一端与LED控制电路的电源端VDD连接，第二场效应管M2的源极与LED控制电路的接地端GND连接，第二电流源I2的第二端、第二场效应管M2的栅极以及第二场效应管M2的漏极共同作为第一电平位移电路114的第三电压输出端，与第二比较电路116连接，以输出第三电压。
通过将第二场效应管M2的源极与LED控制电路的接地端GND连接，第二场效应管M2的栅极以及第二场效应管M2的漏极连接后再接入至第二比较电路116，实现了对LED控制电路的接地端GND的电压的第二预设值的向上电平位移。
如图9所示，所述第二电平位移电路115包括第三场效应管M3和第四电流源I4。
第三场效应管M3的源极与LED控制电路的电源端VDD连接，第四电流源I4的输出端与LED控制电路的接地端GND连接，第三场效应管M3的漏极、第三场效应管M3的栅极以及第四电流源I4的输入端共同作为第二电平位移电路115的第四电压输出端，与第二比较电路116连接，以输出第四电压。
通过将第三场效应管M3的源极与LED控制电路的电源端VDD连接，第三场效应管M3的漏极和所述第三场效应管M3的栅极连接后再接入至第二比较电路116，实现了对LED控制电路的电源端VDD的电压的第三预设值的向下电平位移。
如图10所示，第一电平位移电路114包括第二二极管D2和第三电流源I3。
第三电流源I3的第一端与LED控制电路的电源端VDD连接，第二二极管D2的负极与LED控制电路的接地端GND连接，第三电流源I3的第二端以及第二二极管D2的正极共同作为第一电平位移电路114的第三电压输出端，与第二比较电路116连接，以输出第三电压。
通过将第二二极管D2的负极与LED控制电路的接地端GND连接，第二二极管D2的正极接入至第二比较电路116，实现了对LED控制电路的接地端GND的电压的第二预设值的向上电平位移。
如图10所示，所述第二电平位移电路115包括第三二极管D3和第五电流源I5。
第三二极管D3的正极与LED控制电路的电源端VDD连接，第五电流源I5的输出端与LED控制电路的接地端GND连接，第三二极管D3的负极以及第五电流源I5的输入端共同作为第二电平位移电路115的第四电压输出端，与第二比较电路116连接，以输出第四电压。
通过将第三二极管D3的正极与LED控制电路的电源端VDD连接，第三二极管D3的负极接入至第二比较电路116，实现了对LED控制电路的电源端VDD的电压的第三预设值的向下电平位移。
如图9和图10所示，第二比较电路116包括第二比较器U2。
第二比较器U2的正相输入端作为第二比较电路116的第四电压输入端，与第二电平位移电路115连接，以接入第四电压；第二比较器U2的反相输入端作为第二比较电路116的第三电压输入端，与第一电平位移电路114连接，以接入第三电压；第二比较器U2的输出端作为第二比较电路116的数字信号输出端，与译码电路12连接，以输出数字信号。
如图7至图10所示，驱动电路20包括第四场效应管M4至第六场效应管M6。分流电路14包括分流电阻Rs。
以下结合工作原理对图7至图10所示的作进一步说明：
在图7和图8中，第一电阻R1和第二电阻R2对电源端VDD的电压和接地端GND的电压的压差进行分压以输出第一电压至比较器U1的反相输入端。
在图7中，场效应管M1对电源端VDD的电压进行预设值的压降以输出第二电压至第一比较器U1的正相输入端。
在图8中，二极管D1对电源端VDD的电压进行预设值的压降以输出第二电压至第一比较器U1的正相输入端。
在图7和图8中，第一比较器U1对第一电压和第二电压进行比较，并根据比较结果输出数字信号；数字滤波电路13对数字信号进行数字滤波。译码电路12对数字滤波后的数字信号进行解析以得到本LED控制电路的控制数据，并根据控制数据输出多个控制信号至多个控制信号输出端。第四场效应管M4的栅极至第六场效应管M6的栅极接入多个控制信号，并从第四场效应管M4的漏极至第六场效应管M6的漏极输出多个驱动信号以使多个发光组件30（如发光二极管LED1至发光二极管LED3）发光。需要说明的是，第一比较器U1、数字滤波电路13以及译码电路12均根据电源端VDD的电压和接地端GND的电压的压差进行供电，分流电阻Rs对电源端VDD和接地端GND之间的电流进行分流。
在图9中，第二场效应管M2对接地端GND的电压进行电平位移以输出第三电压至第二比较器U2的反相输入端。第三场效应管M3对电源端VDD的电压进行电平位移以输出第四电压至第二比较器U2的正相输入端。
在图10中，第二二极管D2对接地端GND的电压进行电平位移以输出第三电压至第二比较器U2的反相输入端。第三二极管D3对电源端VDD的电压进行电平位移以输出第四电压至第二比较器U2的正相输入端。
在图9和图10中，第二比较器U2对第三电压和第四电压进行比较，并根据比较结果输出数字信号；数字滤波电路13对数字信号进行数字滤波。译码电路12对数字滤波后的数字信号进行解析以得到本LED控制电路的控制数据，并根据控制数据输出多个控制信号至多个控制信号输出端。第四场效应管M4的栅极至第六场效应管M6的栅极接入多个控制信号，并从第四场效应管M4的漏极至第六场效应管M6的漏极输出多个驱动信号以使多个发光组件30（如发光二极管LED1至发光二极管LED3）发光。需要说明的是，第二比较器U2、数字滤波电路13以及译码电路12均根据电源端VDD的电压和接地端GND的电压的压差进行供电，分流电阻RS对电源端VDD和接地端GND之间的电流进行分流。
本申请实施例还提供一种电子装置，如图11所示，电子装置包括控制器100和n个如上述的LED控制电路10；第1个LED控制电路10的电源端与电源正极和控制器100的电源端连接，第n个LED控制电路10的接地端与控制器100的输入端连接，第i个LED控制电路10的接地端与第i+1个LED控制电路10的电源端连接，控制器100的输出端与电源负极连接；控制器100配置为控制控制器100的输入端和控制器100的输出端通断；其中，n为大于1的自然数，i为小于n的正整数。
当控制器100控制控制器100的输入端和控制器100的输出端断开时，电源正极通过n个如上述的LED控制电路10和电源负极连接，此时，在各个LED控制电路10中，分压电路输出的第一电压为电源正极的电压，而降压电路输出的第二电压得到了一次或多次的压降，故第一电压大于第二电压，数字信号为低电平；当控制器100控制控制器100的输入端和控制器100的输出端导通时，电源正极通过n个如上述的LED控制电路10和电源负极连接，此时，在各个LED控制电路10中，分压电路输出的第一电压为对电源端的电压和接地端的电压的压差进行分压后的电压，而降压电路输出的第二电压对电源端的电压进行预设值的压降，此时，第一电压小于第二电压，数字信号为高电平；从而实现了地线传输指令以实现LED的控制。
本申请实施例还提供一种电子设备，如图12所示，电子设备包括直流转换电路90、信号发送电路80、第一开关电路60以及m个如上述的LED控制电路10；第1个LED控制电路10的电源端与电源正极连接，第m个LED控制电路10的接地端与第一开关电路60的输入端和和直流转换电路90的输入端连接，第j个LED控制电路10的接地端与第j+1个LED控制电路10的电源端连接，第一开关电路60的输出端与电源负极和直流转换电路90的接地端连接，信号发送电路80的输出端与第一开关电路60的控制端连接。
信号发送电路80配置为输出第一控制信号；第一开关电路60配置为根据第一控制信号通断；直流转换电路90配置为当单向导通电路单向导通时，对第m个LED控制电路的接地端的电压进行钳位；其中，m为大于1的自然数，j为小于m的正整数。
当第一开关电路60配置为根据第一控制信号断开时，直流转换电路90对第m个LED控制电路10的接地端的电压进行钳位，故各个LED控制电路10中，电源端的电压和接地端的电压的压差小于预设电压，此时，分压电路输出的第一电压小于降压电路输出的第二电压，数字信号为高电平；当第一开关电路60配置为根据第一控制信号导通时，第m个LED控制电路10的接地端的电压连接至电源负极，故各个LED控制电路10中，电源端的电压和接地端的电压的压差大于预设电压，此时，分压电路输出的第一电压大于降压电路输出的第二电压，数字信号为低电平；从而实现了地线传输指令以实现LED的控制。
当第一开关电路60配置为根据第一控制信号断开时，直流转换电路90对第m个LED控制电路10的接地端的电压进行钳位，故各个LED控制电路10中，电源端的电压和接地端的电压的压差小于预设电压，此时，第一电位平移电路输出的第三电压小于第二电位平移电路输出的第四电压，数字信号为高电平；当第一开关电路60配置为根据第一控制信号导通时，第m个LED控制电路10的接地端的电压连接至电源负极，故各个LED控制电路10中，电源端的电压和接地端的电压的压差大于预设电压，此时，第一电位平移电路输出的第三电压大于第二电位平移电路输出的第四电压，数字信号为低电平；从而实现了地线传输指令以实现LED的控制。
如图13所示，所述电子设备包括还包括第二开关电路701。
第m个LED控制电路10的接地端与第一开关电路60的输入端和第二开关电路701的输入端连接，第二开关电路701的输出端与直流转换电路90的输入端连接；信号发送电路80还配置为输出第二控制信号；第二开关电路701配置为当第一开关电路60断开时，根据第二控制信号导通以转接第m个LED控制电路10的接地端的电压。
直流转换电路90具体配置为当第二开关电路701导通时，对第m个LED控制电路10的接地端的电压进行钳位。
通过设置第二开关电路701，当第一开关电路60配置为根据第一控制信号导通时，第二开关电路701停止工作，第m个LED控制电路10的接地端的电压连接至电源负极，避免了第m个LED控制电路10的接地端的电压连接至直流转换电路90，防止直流转换电路90影响第m个LED控制电路10的接地端的电压，提高系统的稳定性和可靠性。
如图14所示，所述电子设备包括还包括单向导通电路702。
第m个LED控制电路10的接地端与第一开关电路60的输入端和单向导通电路702的输入端连接，单向导通电路702的输出端与直流转换电路90的输入端连接。
单向导通电路702配置为当第一开关电路60断开时，单向导通第m个LED控制电路10的接地端的电压。
直流转换电路90具体配置为当单向导通电路702单向导通时，对第m个LED控制电路10的接地端的电压进行钳位。
通过设置单向导通电路702，当第一开关电路60配置为根据第一控制信号导通时，单向导通电路702停止工作，第m个LED控制电路10的接地端的电压连接至电源负极，避免了第m个LED控制电路10的接地端的电压连接至直流转换电路90，防止直流转换电路90影响第m个LED控制电路10的接地端的电压，提高系统的稳定性和可靠性。
当第一开关电路60配置为根据第一控制信号断开时，单向导通电路702单向导通第m个LED控制电路10的接地端的电压，直流转换电路90对第m个LED控制电路10的接地端的电压进行钳位，故各个LED控制电路10中，电源端的电压和接地端的电压的压差小于预设电压，此时，分压电路输出的第一电压小于降压电路输出的第二电压，数字信号为高电平；当第一开关电路60配置为根据第一控制信号导通时，单向导通电路702停止工作，第m个LED控制电路10的接地端的电压连接至电源负极，故各个LED控制电路10中，电源端的电压和接地端的电压的压差大于预设电压，此时，分压电路输出的第一电压大于降压电路输出的第二电压，数字信号为低电平；从而实现了地线传输指令以实现LED的控制。
当第一开关电路60配置为根据第一控制信号断开时，单向导通电路702单向导通第m个LED控制电路10的接地端的电压，直流转换电路90对第m个LED控制电路10的接地端的电压进行钳位，故各个LED控制电路10中，电源端的电压和接地端的电压的压差小于预设电压，此时，第一电位平移电路输出的第三电压小于第二电位平移电路输出的第四电压，数字信号为高电平；当第一开关电路60配置为根据第一控制信号导通时，单向导通电路702停止工作，第m个LED控制电路10的接地端的电压连接至电源负极，故各个LED控制电路10中，电源端的电压和接地端的电压的压差大于预设电压，此时，第一电位平移电路输出的第三电压大于第二电位平移电路输出的第四电压，数字信号为低电平；从而实现了地线传输指令以实现LED的控制。
如图15所示，所述电子设备包括还包括一组或多组的LED控制电路10；其中，每组LED控制电路包括串联的m个上述的LED控制电路10。
如图16所示，上述电子设备还包括保护电路50。
保护电路50连接在第1个LED控制电路10的电源端和第m个LED控制电路10的接地端之间，配置为滤除第1个LED控制电路10的电源端和第m个LED控制电路10的接地端之间的电压中的尖峰信号。
需要说明的是，直流转换电路90，还与信号发送电路80连接，还配置为根据第m个LED控制电路的接地端GND的电压输出内部供电电压以对信号发送电路80进行供电。
如图17所示，所述直流转换电路90包括第三电阻R3、第四电阻R4以及第一稳压管Z1；第三电阻R3的第一端作为直流转换电路90的电压输入端，与单向导通电路70连接，以接入第m个LED控制电路的接地端GND的电压；第三电阻R3的第二端、第四电阻R4的第一端以及第一稳压管Z1的负极共同直流转换电路90的内部供电电压输出端，与信号发送电路80连接，以输出内部供电电压；第四电阻R4的第二端以及第一稳压管Z1的正极共接于电源负极。
如图17所示，信号发送电路80包括微处理器U3；微处理器U3的电源端VCC作为信号发送电路80的内部供电电压输入端，与直流转换电路90连接，以接入内部供电电压；微处理器U3的第一通用输入输出端P1.0作为信号发送电路80的第一控制信号输出端，与第一开关电路60连接，以输出第一控制电压；微处理器U3的接地端GND与电源负极连接。
第一开关电路60包括开关管Q1。单向导通电路70包括第二二极管D4。保护电路50包括第二稳压管Z2。
本申请实施例通过LED控制电路具有电源端、接地端以及多个控制信号输出端；且电平识别电路根据电源端的电压和接地端的电压的压差输出数字信号；译码电路对数字信号进行解析以得到本LED控制电路的控制数据，并根据所述控制数据输出多个控制信号至所述多个控制信号输出端。由于电平识别电路仅根据电源端的电压和接地端的电压的压差输出数字信号；从而电平识别电路无需基准电压作为参考信号，故省略了提供基准电压的基准电路，简化了电路并节约了硬件成本。
以上所述实施例仅用以说明本申请的技术方案，而非对其限制；尽管参照前述实施例对本申请进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本申请各实施例技术方案的精神和范围，均应包含在本申请的保护范围之内。

Claims (24)

  1. 一种LED控制电路，其特征在于，具有电源端、接地端以及多个控制信号输出端；所述LED控制电路包括：
    电平识别电路，与所述LED控制电路的电源端和所述LED控制电路的接地端连接，配置为根据所述电源端的电压和所述接地端的电压的压差输出数字信号；
    译码电路，与所述电平识别电路和所述LED控制电路的多个控制信号输出端连接，配置为对所述数字信号进行解析以得到本LED控制电路的控制数据，并根据所述控制数据输出多个控制信号至所述多个控制信号输出端。
  2. 如权利要求1所述的LED控制电路，其特征在于，还包括：
    数字滤波电路，连接在所述电平识别电路和所述译码电路之间，配置为对所述数字信号进行数字滤波；
    所述译码电路具体配置为对数字滤波后的所述数字信号进行解析以得到本LED控制电路的控制数据，并根据所述控制数据输出多个控制信号至所述多个控制信号输出端。
  3. 如权利要求1所述的LED控制电路，其特征在于，所述LED控制电路的多个控制信号输出端与驱动电路连接；
    所述驱动电路配置为根据所述多个控制信号输出多个驱动信号，以使多个发光组件发光。
  4. 如权利要求1所述的LED控制电路，其特征在于，所述电平识别电路包括：
    分压电路，与所述LED控制电路的电源端和所述LED控制电路的接地端连接，配置为对所述电源端的电压和所述接地端的电压的压差进行分压以输出第一电压；
    降压电路，与所述LED控制电路的电源端和所述LED控制电路的接地端连接，配置为对所述电源端的电压进行预设值的压降以输出第二电压；
    第一比较电路，与所述译码电路、所述分压电路和所述降压电路连接，配置为对所述第一电压和所述第二电压进行比较，并根据比较结果输出数字信号。
  5. 如权利要求4所述的LED控制电路，其特征在于，所述降压电路包括第一场效应管和第一电流源；
    所述第一场效应管源极与所述LED控制电路的电源端连接，所述第一电流源的输出端与所述LED控制电路的接地端连接，所述第一场效应管的漏极、所述第一场效应管的栅极以及所述第一电流源的输入端共同作为所述降压电路的第二电压输出端，与所述第一比较电路连接，以输出所述第二电压。
  6. 如权利要求4所述的LED控制电路，其特征在于，所述降压电路包括第一二极管和第二电流源；
    所述第一二极管的正极与所述LED控制电路的电源端连接，所述第二电流源的输出端与所述LED控制电路的接地端连接，所述第一二极管的负极以及所述第一电流源的输入端共同作为所述降压电路的第二电压输出端，与所述第一比较电路连接，以输出所述第二电压。
  7. 如权利要求4所述的LED控制电路，其特征在于，所述分压电路包括第一电阻和第二电阻；
    所述第一电阻的第一端与所述LED控制电路的电源端连接，所述第二电阻的第一端与所述LED控制电路的接地端连接，所述第一电阻的第二端和所述第二电阻的第二端共同作为所述分压电路的第一电压输出端，与所述第一比较电路连接，以输出所述第一电压。
  8. 如权利要求5所述的LED控制电路，其特征在于，所述第一比较电路包括第一比较器；
    所述第一比较器的正相输入端作为所述第一比较电路的第二电压输入端，与所述降压电路连接，以接入所述第二电压；所述第一比较器的反相输入端作为所述第一比较电路的第一电压输入端，与所述分压电路连接，以接入所述第一电压；所述第一比较器的输出端作为所述比较电路的数字信号输出端，与所述译码电路连接，以输出所述数字信号。
  9. 如权利要求1所述的LED控制电路，其特征在于，所述电平识别电路包括：
    第一电平位移电路，与所述LED控制电路的电源端和所述LED控制电路的接地端连接，配置为对所述接地端的电压进行电平位移以输出第三电压；
    第二电平位移电路，与所述LED控制电路的电源端和所述LED控制电路的接地端连接，配置为对所述电源端的电压进行电平位移以输出第四电压；
    第二比较电路，与所述译码电路、所述第一电平位移电路和所述第二电平位移电路连接，配置为对所述第三电压和所述第四电压进行比较，并根据比较结果输出所述数字信号。
  10. 如权利要求9所述的LED控制电路，其特征在于，所述第一电平位移电路包括第二场效应管和第二电流源；
    所述第二电流源的第一端与所述LED控制电路的电源端连接，所述第二场效应管的源极与所述LED控制电路的接地端连接，所述第二电流源的第二端、所述第二场效应管的栅极以及所述第二场效应管的漏极共同作为所述第一电平位移电路的第三电压输出端，与所述第二比较电路连接，以输出所述第三电压。
  11. 如权利要求9所述的LED控制电路，其特征在于，所述第一电平位移电路包括第二二极管和第三电流源；
    所述第三电流源的第一端与所述LED控制电路的电源端连接，所述第二二极管的负极与所述LED控制电路的接地端连接，所述第三电流源的第二端以及所述第二二极管的正极共同作为所述第一电平位移电路的第三电压输出端，与所述第二比较电路连接，以输出所述第三电压。
  12. 如权利要求9所述的LED控制电路，其特征在于，所述第二电平位移电路包括第三场效应管和第四电流源；
    所述第三场效应管的源极与所述LED控制电路的电源端连接，所述第四电流源的输出端与所述LED控制电路的接地端连接，所述第三场效应管的漏极、所述第三场效应管的栅极以及所述第四电流源的输入端共同作为所述第二电平位移电路的第四电压输出端，与所述第二比较电路连接，以输出所述第四电压。
  13. 如权利要求9所述的LED控制电路，其特征在于，所述第二电平位移电路包括第三二极管和第五电流源；
    所述第三二极管的正极与所述LED控制电路的电源端连接，所述第五电流源的输出端与所述LED控制电路的接地端连接，所述第三二极管的负极以及所述第五电流源的输入端共同作为所述第二电平位移电路的第四电压输出端，与所述第二比较电路连接，以输出所述第四电压。
  14. 如权利要求9所述的LED控制电路，其特征在于，所述第二比较电路包括第二比较器；
    所述第二比较器的正相输入端作为所述第二比较电路的第四电压输入端，与所述第二电平位移电路连接，以接入所述第四电压；所述第二比较器的反相输入端作为所述第二比较电路的第三电压输入端，与所述第一电平位移电路连接，以接入所述第三电压；所述第二比较器的输出端作为所述第二比较电路的数字信号输出端，与所述译码电路连接，以输出所述数字信号。
  15. 如权利要求1所述的LED控制电路，其特征在于，所述译码电路还根据所述电源端的电压和所述接地端的电压的压差进行供电，所述LED控制电路还包括：
    分流电路，连接在所述电源端和所述接地端之间，配置为对所述电源端和所述接地端之间的电流进行分流。
  16. 一种电子装置，其特征在于，所述电子装置包括控制器和n个如权利要求1至15任意一项所述的LED控制电路；
    第1个所述LED控制电路的电源端与电源正极和所述控制器的电源端连接，第n个所述LED控制电路的接地端与所述控制器的输入端连接，所述第i个所述LED控制电路的接地端与所述第i+1个所述LED控制电路的电源端连接，所述控制器的输出端与电源负极连接；
    所述控制器配置为控制所述控制器的输入端和所述控制器的输出端通断；
    其中，n为大于1的自然数，i为小于n的正整数。
  17. 一种电子设备，其特征在于，所述电子设备包括直流转换电路、信号发送电路、第一开关电路以及m个如权利要求1至15任意一项所述的LED控制电路；
    第1个所述LED控制电路的电源端与电源正极连接，第m个所述LED控制电路的接地端与所述第一开关电路的输入端和所述直流转换电路的输入端连接，所述第j个所述LED控制电路的接地端与所述第j+1个所述LED控制电路的电源端连接，所述第一开关电路的输出端与电源负极和直流转换电路的接地端连接，所述信号发送电路的输出端与所述第一开关电路的控制端连接；
    所述信号发送电路配置为输出第一控制信号；
    所述第一开关电路配置为根据所述第一控制信号通断；
    所述直流转换电路配置为当所述第一开关电路断开时，对第m个所述LED控制电路的接地端的电压进行钳位；
    其中，m为大于1的自然数，j为小于m的正整数。
  18. 如权利要求17所述的电子设备，其特征在于，所述电子设备包括还包括第二开关电路；
    第m个所述LED控制电路的接地端与所述第一开关电路的输入端和所述第二开关电路的输入端连接，所述第二开关电路的输出端与所述直流转换电路的输入端连接；
    所述信号发送电路还配置为输出第二控制信号；
    所述第二开关电路配置为当所述第一开关电路断开时，根据所述第二控制信号导通以转接第m个所述LED控制电路的接地端的电压；
    所述直流转换电路具体配置为当所述第二开关电路导通时，对第m个所述LED控制电路的接地端的电压进行钳位。
  19. 如权利要求17所述的电子设备，其特征在于，所述电子设备包括还包括单向导通电路；
    第m个所述LED控制电路的接地端与所述第一开关电路的输入端和所述单向导通电路的输入端连接，所述单向导通电路的输出端与所述直流转换电路的输入端连接；
    所述单向导通电路配置为当所述第一开关电路断开时，单向导通第m个所述LED控制电路的接地端的电压；
    所述直流转换电路具体配置为当所述单向导通电路单向导通时，对第m个所述LED控制电路的接地端的电压进行钳位。
  20. 如权利要求17所述的电子设备，其特征在于，所述电子设备包括还包括一组或多组所述的LED控制电路；
    其中，每组所述LED控制电路包括串联的m个如权利要求1至15任意一项所述的LED控制电路。
  21. 如权利要求17所述的电子设备，其特征在于，还包括保护电路；
    所述保护电路连接在所述第1个所述LED控制电路的电源端和所述第m个所述LED控制电路的接地端之间，配置为滤除第1个所述LED控制电路的电源端和所述第m个所述LED控制电路的接地端之间的电压中的尖峰信号。
  22. 如权利要求17所述的电子设备，其特征在于，所述直流转换电路，还与所述信号发送电路连接，还配置为根据第m个所述LED控制电路的接地端的电压输出内部供电电压以对所述信号发送电路进行供电。
  23. 如权利要求22所述的电子设备，其特征在于，所述直流转换电路包括第三电阻、第四电阻以及第一稳压管；
    所述第三电阻的第一端作为所述直流转换电路的电压输入端，与所述单向导通电路连接，以接入第m个所述LED控制电路的接地端的电压；
    所述第三电阻的第二端、所述第四电阻的第一端以及所述第一稳压管的负极共同所述直流转换电路的内部供电电压输出端，与所述信号发送电路连接，以输出所述内部供电电压；
    所述第四电阻的第二端以及所述第一稳压管的正极共接于电源负极。
  24. 如权利要求22所述的电子设备，其特征在于，所述信号发送电路包括微处理器；
    所述微处理器的电源端作为所述信号发送电路的内部供电电压输入端，与所述直流转换电路连接，以接入所述内部供电电压；
    所述微处理器的第一通用输入输出端作为所述信号发送电路的第一控制信号输出端，与所述第一开关电路连接，以输出所述第一控制电压；
    所述微处理器的接地端与电源负极连接。
PCT/CN2022/115852 2022-05-17 2022-08-30 Led控制电路及电子设备、电子装置 WO2023221330A1 (zh)

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