WO2023078157A1 - 一种电源电路及显示屏 - Google Patents

一种电源电路及显示屏 Download PDF

Info

Publication number
WO2023078157A1
WO2023078157A1 PCT/CN2022/127988 CN2022127988W WO2023078157A1 WO 2023078157 A1 WO2023078157 A1 WO 2023078157A1 CN 2022127988 W CN2022127988 W CN 2022127988W WO 2023078157 A1 WO2023078157 A1 WO 2023078157A1
Authority
WO
WIPO (PCT)
Prior art keywords
electrically connected
module
output end
voltage
output terminal
Prior art date
Application number
PCT/CN2022/127988
Other languages
English (en)
French (fr)
Inventor
蓝荣南
吴春光
Original Assignee
西安青松光电技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 西安青松光电技术有限公司 filed Critical 西安青松光电技术有限公司
Publication of WO2023078157A1 publication Critical patent/WO2023078157A1/zh

Links

Images

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters

Definitions

  • the embodiments of the present application relate to the technical field of LED drive circuits, and in particular to a power supply circuit and a display screen.
  • the smallest light-emitting unit of the LED display is the LED lamp bead, which has three primary colors of R, G, and B, and is usually composed of three-color light-emitting chips of R, G, and B.
  • Light-emitting diodes have polarity, that is, light-emitting diodes include a cathode and an anode.
  • Fig. 1 is a schematic structural diagram of an LED lamp bead provided in the related art. Referring to Fig. 1 , generally R, G, and B light-emitting chips are packaged inside an LED lamp bead.
  • the cathodes or anodes of the three chips in one lamp bead are usually connected together, that is, the lamp bead generally includes two types of LED lamp beads, common anode and common cathode.
  • the VF value of the light-emitting chip (VF value is the forward voltage, when the diode is turned on, the voltage applied to both ends of the LED chip) is also different.
  • the R light-emitting chip needs to be powered by one voltage, and the G and B light-emitting chips need to be powered by another voltage.
  • the LED display screens in the related art are usually powered by the same voltage for R, G, and B LED chips, resulting in waste of energy.
  • the display In order to meet the two types of lamp beads with common cathode and common anode, the display usually needs to design two different LED chips. Power supply.
  • This application provides a power supply circuit and a display screen, which can supply power for common cathode display screens and common anode display screens. There is no need to design two power sources. It is flexible and practical, can effectively reduce costs, and can meet the requirements of different LED chips. voltage needs, reducing energy consumption.
  • the embodiment of the present application provides a power supply circuit
  • the power supply circuit includes:
  • a rectification and filtering module a first power conversion module, a second power conversion module, a first step-down filter module and a second step-down filter module;
  • the input end of the rectification and filtering module is used to input an AC signal, and the output end of the rectification and filtering module is respectively electrically connected to the input end of the first power conversion module and the input end of the second power conversion module, so The rectification and filtering module is used to rectify and filter the AC signal, and output the high-voltage DC signal;
  • the first power conversion module is used to convert the high-voltage direct current signal into a first high-voltage pulse signal
  • the second power conversion module is used to convert the high-voltage direct current signal into a second high-voltage pulse signal
  • the output end of the first power conversion module is electrically connected to the input end of the first step-down filter module, and the output end of the second power conversion module is electrically connected to the input end of the second step-down filter module;
  • the first step-down filter module includes a first output terminal and a second output terminal, the first step-down filter module is used to perform step-down filter on the first high-voltage pulse signal, and pass through the first output terminal outputting a first voltage signal, and outputting a second voltage signal through the second output terminal;
  • the second step-down filter module includes a third output terminal and a fourth output terminal, the second step-down filter module is used to perform step-down filter on the second high-voltage pulse signal, and output the first Three voltage signals, outputting a fourth voltage signal through the fourth output terminal;
  • the first voltage signal is greater than the second voltage signal
  • the third voltage signal is greater than the fourth voltage signal
  • the first voltage difference between the first voltage signal and the second voltage signal is fixed
  • the second voltage difference between the third voltage signal and the fourth voltage signal is fixed, and the first voltage difference is greater than the second pressure difference
  • the first output end is electrically connected to the third output end or the second output end is electrically connected to the fourth output end.
  • the power supply circuit also includes:
  • a connector where the connector is used to connect the first output terminal to the third output terminal, or the connector is used to connect the second output terminal to the fourth output terminal.
  • the power supply circuit also includes:
  • the first end of the first switch is electrically connected to the first output end, the second end of the first switch is electrically connected to the third output end; the first end of the second switch is electrically connected to the The second output end is electrically connected, and the second end of the second switch is electrically connected to the fourth output end.
  • the first voltage signal includes 3.8V-4.2V
  • the second voltage signal includes 0V
  • a voltage difference range between the third voltage signal and the fourth voltage signal includes 2.8V-3.2V.
  • the power supply circuit also includes:
  • Lightning protection module and electromagnetic interference EMI module
  • the output end of the lightning protection module is electrically connected to the input end of the EMI module, and the output end of the EMI module is electrically connected to the input end of the rectification and filtering module.
  • the power supply circuit also includes:
  • a power factor correction PFC module the input end of the PFC module is electrically connected to the rectification and filtering module, and the output end is respectively electrically connected to the first power conversion module and the second power conversion module.
  • the power supply circuit also includes:
  • the first input end of the first PWM control circuit is electrically connected to the first output end of the first step-down filter module, and the output end of the first PWM control circuit is electrically connected to the first power conversion module;
  • the first input end of the second PWM control circuit is electrically connected to the third output end of the second step-down filter module, and the output end of the second PWM control circuit is electrically connected to the second power conversion module.
  • the power supply circuit also includes:
  • the input end of the first protection circuit is electrically connected to the first output end of the first step-down filter module, and the output end of the first protection circuit is electrically connected to the second input end of the first PWM control circuit ;
  • the input end of the second protection circuit is electrically connected to the third output end of the second step-down filter module, and the output end of the second protection circuit is electrically connected to the second input end of the second PWM control circuit .
  • the embodiment of the present application further provides a display screen, which includes: a plurality of lamp beads and the power supply circuit described in any one of the first aspects of the present application.
  • the lamp bead is a common-cathode lamp bead, and the second output terminal of the first step-down filter module of the power circuit and the fourth output terminal of the second step-down filter module of the power circuit Terminal connection;
  • the lamp bead is a common anode lamp bead, and the first output end of the first step-down filter module of the power supply circuit is connected to the third output end of the second step-down filter module of the power supply circuit. connect.
  • the power supply circuit of this embodiment includes a first output terminal OUT1, a second output terminal OUT2, a third output terminal OUT3 and a fourth output terminal OUT4, the first output terminal OUT1 outputs the first voltage signal, and the second output terminal OUT2 outputs the second voltage signal, the third output terminal OUT3 outputs a third voltage signal, and the fourth output terminal OUT4 outputs a fourth voltage signal; the first voltage signal is greater than the second voltage signal, the third voltage signal is greater than the fourth voltage signal, the first voltage signal and The first voltage difference of the second voltage signal is fixed, the second voltage difference between the third voltage signal and the fourth voltage signal is fixed, and the first voltage difference is greater than the second voltage difference; by setting the first output terminal and the third output terminal to be electrically connected Or the second output terminal and the fourth output terminal are electrically connected, and the power supply circuit can supply power for the common cathode display screen and the common anode display screen. There is no need to design two power supplies, which is flexible and practical, can effectively reduce costs, and can meet Different
  • Fig. 1 is a schematic structural diagram of an LED lamp bead provided by the related art
  • FIG. 2 is a schematic structural diagram of a power supply circuit provided by an embodiment of the present application.
  • FIG. 3 is a schematic structural diagram of another power supply circuit provided by an embodiment of the present application.
  • FIG. 4 is a schematic structural diagram of another power supply circuit provided by an embodiment of the present application.
  • FIG. 5 is a schematic structural diagram of another power supply circuit provided by an embodiment of the present application.
  • FIG. 6 is a schematic structural diagram of another power supply circuit provided by an embodiment of the present application.
  • Fig. 7 is a schematic structural diagram of a common anode LED lamp bead circuit provided by the embodiment of the present application.
  • Fig. 8 is a schematic structural diagram of a common-cathode LED lamp bead circuit provided by an embodiment of the present application.
  • FIG. 2 is a schematic structural diagram of a power supply circuit provided by an embodiment of the present application.
  • an embodiment of the present application provides a power supply circuit for supplying power to an LED display.
  • the power supply circuit includes: a rectification and filtering module 100 , a first power conversion module 101 , a second power conversion module 102 , a first step-down filter module 103 and a second step-down filter module 104 .
  • the input end of the rectification filter module 100 is used for inputting the AC signal, and the output end of the rectification filter module 100 is electrically connected with the input end of the first power conversion module 101 and the input end of the second power conversion module 102 respectively, and the rectification filter module 100 uses It is used to rectify and filter AC signals and output high-voltage DC signals;
  • the first power conversion module 101 is used to convert the high-voltage direct current signal into a first high-voltage pulse signal
  • the second power conversion module 102 is used to convert the high-voltage direct current signal into a second high-voltage pulse signal
  • the output end of the first power conversion module 101 is electrically connected to the input end of the first step-down filter module 103, and the output end of the second power conversion module 102 is electrically connected to the input end of the second step-down filter module 104;
  • the first step-down filtering module 103 includes a first output terminal OUT1 and a second output terminal OUT2.
  • the first step-down filtering module 103 is used to perform step-down filtering on the first high-voltage pulse signal, and output the first A voltage signal, outputting a second voltage signal through the second output terminal OUT2;
  • the second step-down filtering module 104 includes a third output terminal OUT3 and a fourth output terminal OUT4.
  • the second step-down filtering module 104 is used to perform step-down filtering on the second high-voltage pulse signal, and output the third output terminal OUT3 through the third output terminal OUT3.
  • the first voltage signal is greater than the second voltage signal
  • the third voltage signal is greater than the fourth voltage signal
  • the first voltage difference between the first voltage signal and the second voltage signal is fixed
  • the second voltage difference between the third voltage signal and the fourth voltage signal is The pressure difference is fixed, the first pressure difference is greater than the second pressure difference; the first output end is electrically connected to the third output end or the second output end is electrically connected to the fourth output end.
  • the alternating current signal may be alternating current 220V mains.
  • the rectification and filtering module 100 is used for rectifying and filtering the AC signal, and outputting the high-voltage DC signal.
  • the rectification circuit of the rectification filter module 100 can use the unidirectional conduction characteristic of the diode to rectify the alternating current with changing directions into direct current; the rectified alternating current obtains pulsating direct current, which contains a large alternating current ripple, and the filtering circuit can reduce the alternating current ripple
  • the components make the rectified voltage waveform smoother.
  • the first power conversion module 101 and the second power conversion module 102 mainly include a switch tube and a control circuit for converting the high-voltage DC voltage signal output by the rectification and filtering module 100 into a high-frequency first high-voltage pulse signal and a second high-voltage pulse signal .
  • the first step-down filter module 103 and the second step-down filter module 104 include a first step-down unit and a first filter unit.
  • the first step-down unit can be a transformer, which can reduce the high voltage to a required low voltage.
  • the first filter unit The unit utilizes the charging and discharging effect of the capacitor to smooth the output voltage.
  • the first step-down unit converts the high-voltage high-pulse signal into a low-voltage low-pulse signal, and the first filter unit converts the low-voltage low-pulse signal into a low-voltage DC signal.
  • the first step-down filtering module 103 is used to change the first high-voltage pulse signal into two low-voltage constant DC voltages with different voltage values, output the first voltage signal through the first output terminal OUT1, and output the second voltage signal through the second output terminal OUT2 , the first voltage signal is greater than the second voltage signal, and the voltage difference between the first voltage signal and the second voltage signal is constant.
  • the second step-down filtering module 104 is used to change the second high-voltage pulse signal into two low-voltage constant DC voltages with different voltage values, output the third voltage signal through the third output terminal OUT3, and output the fourth voltage signal through the fourth output terminal OUT4 .
  • the second step-down filtering module 104 may include a second transforming unit and a second filtering unit.
  • the first voltage signal, the second voltage signal, the third voltage signal and the fourth voltage signal are all output signals of the four output terminals when the four output terminals are not connected.
  • the first output terminal OUT1 and the third output terminal OUT3 are electrically connected, the first output terminal OUT1 and the third output terminal OUT3 are at the same potential, that is, both the first output terminal OUT1 and the third output terminal OUT3 output the first voltage signal and the third output terminal OUT3.
  • the larger electrical signal among the three electrical signals; when the second output terminal OUT2 and the fourth output terminal OUT4 are electrically connected, the second output terminal OUT2 and the fourth output terminal OUT4 have the same potential, and both output the second voltage signal and the fourth voltage The smaller of the signals.
  • the second output terminal OUT2 and the fourth output terminal OUT4 are connected in series for output by means of a switching element or a connecting element, and the second output terminal OUT2 and the fourth output terminal OUT4 are at the same potential.
  • the first voltage difference is greater than the second voltage difference
  • the voltage output from the first output terminal OUT1 is greater than the voltage output from the third output terminal OUT3
  • the first output terminal OUT1 can be connected to the anode of the LED chip with a larger forward voltage VF value.
  • the third output terminal OUT3 is electrically connected to the anode of the LED chip with a smaller VF value.
  • the first output terminal OUT1 and the third output terminal OUT3 are connected in series by using a switching element or a connecting element, and the first output terminal OUT1 and the third output terminal OUT3 are at the same potential for Connect the anode of the LED chip. Since the first voltage difference is greater than the second voltage difference, the voltage output from the second output terminal OUT2 is smaller than the voltage output from the fourth output terminal OUT4, and the fourth output terminal OUT4 can be electrically connected to the cathode of the LED chip with a larger VF value, The second output terminal OUT2 is electrically connected to the cathode of the LED chip with a smaller VF value.
  • the power supply circuit of this embodiment includes a first output terminal OUT1, a second output terminal OUT2, a third output terminal OUT3 and a fourth output terminal OUT4, the first output terminal OUT1 outputs the first voltage signal, and the second output terminal OUT2 outputs the second voltage signal, the third output terminal OUT3 outputs a third voltage signal, and the fourth output terminal OUT4 outputs a fourth voltage signal; the first voltage signal is greater than the second voltage signal, the third voltage signal is greater than the fourth voltage signal, the first voltage signal and The first voltage difference of the second voltage signal is fixed, the second voltage difference between the third voltage signal and the fourth voltage signal is fixed, and the first voltage difference is greater than the second voltage difference; by setting the first output terminal and the third output terminal to be electrically connected Or the second output terminal and the fourth output terminal are electrically connected, and the power supply circuit can supply power for the common cathode display screen and the common anode display screen. There is no need to design two power supplies, which is flexible and practical, can effectively reduce costs, and can meet Different
  • Fig. 3 is a schematic structural diagram of another power supply circuit provided by the embodiment of the present application.
  • the power supply circuit further includes:
  • the connector 105, the connector 105 is used to connect the first output terminal OUT1 and the third output terminal OUT3, or the connector 105 is used to connect the second output terminal OUT2 to the fourth output terminal OUT4.
  • the connector 105 can be used to electrically connect the second output terminal OUT2 to the fourth output terminal OUT4 .
  • the connector 105 can be used to electrically connect the first output terminal OUT1 and the third output terminal OUT3 .
  • the connector 105 may be any connection device capable of realizing electrical connection.
  • the connector 105 may be a wire or a bus bar.
  • the output terminal is connected in the form of a connector 105, and the implementation method is simple and easy to operate.
  • Fig. 4 is a schematic structural diagram of another power supply circuit provided by the embodiment of the present application.
  • the power supply circuit further includes:
  • the first end of the first switch 106 is electrically connected to the first output end OUT1, the second end of the first switch 106 is electrically connected to the third output end OUT3; the first end of the second switch 107 is electrically connected to the second output end OUT2 , the second end of the second switch 107 is electrically connected to the fourth output end OUT4.
  • the output terminal can be adjusted and controlled by setting the first switch 106 and the second switch 107 .
  • the independent output of the first output terminal OUT1 and the third output terminal OUT3 is realized, and by controlling the closing of the first switch 106, the serial output of the first output terminal OUT1 and the third output terminal OUT3 is realized;
  • the second switch 107 By controlling the opening of the second switch 107, the independent output of the second output terminal OUT2 and the fourth output terminal OUT4 is realized, and by controlling the closing of the second switch 107, the serial output of the second output terminal OUT2 and the fourth output terminal OUT4 is realized.
  • the first switch 106 and the second switch 107 any switching between the power supply mode of the common cathode display screen and the common anode display screen can be realized.
  • the second switch 107 when the power supply circuit supplies power to the common-cathode display screen, the second switch 107 is closed, and the second output terminal OUT2 and the fourth output terminal OUT4 are connected in series for output; the first switch 106 is not closed, and the first output terminal OUT1 and the third output terminal OUT3 are output separately.
  • the first switch 106 When the power supply circuit supplies power to the common anode display screen, the first switch 106 is closed, and the first output terminal OUT1 and the third output terminal OUT3 are connected in series for output; the second switch 107 is not closed, and the second output terminal OUT2 and the fourth output terminal The terminal power OUT4 is output separately.
  • the first voltage signal includes 3.8V-4.2V
  • the second voltage signal includes 0V
  • the voltage difference range between the third voltage signal and the fourth voltage signal includes 2.8V-3.2V.
  • the VF value of the R light-emitting chip is between 1.8-2.4V
  • the VF value of the G and B light-emitting chips is between 2.5-3.2V.
  • the first voltage signal is 3.8V-4.2V
  • the second voltage signal is 0V
  • the voltage difference range between the third voltage signal and the fourth voltage signal is 2.8V-3.2V, which can compensate for the electrical loss due to the overall circuit, LED light-emitting control chip and voltage drop line loss, and meet the requirements of the LED light-emitting chip The voltage requirements of the power supply.
  • the first voltage signal may be 3.8V
  • the second voltage signal may be 0V
  • the third voltage signal may be 2.8V
  • the fourth voltage signal may be 0V
  • the first voltage signal may be 4.2V
  • the second voltage signal may be The signal may be 0V
  • the third voltage signal may be 3.2V
  • the fourth voltage signal may be 0V.
  • Fig. 5 is a schematic structural diagram of another power supply circuit provided by the embodiment of the present application.
  • the power supply circuit further includes:
  • the output end of the lightning protection module 10 is electrically connected to the input end of the EMI module 11 , and the output end of the EMI module 11 is electrically connected to the input end of the rectification and filtering module 100 .
  • the lightning protection module 10 can prevent damage caused by lightning and other internal overvoltage intrusion, thereby protecting the power supply circuit and improving its safety and stability.
  • the EMI module 11 is mainly used to suppress electromagnetic interference, prevent electromagnetic noise and clutter signals in the AC input from interfering with the power supply, and prevent high-frequency clutter generated by the power supply itself from interfering with the AC input.
  • the power supply circuit further includes:
  • the PFC module 12 the input end of the PFC module is electrically connected to the rectification and filtering module 100, and the output end is electrically connected to the first power conversion module 101 and the second power conversion module 102 respectively.
  • the PFC module 12 can improve power factor, reduce harmonic content, and improve power supply efficiency.
  • Fig. 6 is a schematic structural diagram of another power supply circuit provided by the embodiment of the present application.
  • the power supply circuit further includes:
  • the first input end of the first PWM control circuit 13 is electrically connected to the first output end OUT1 of the first step-down filter module 103, and the output end of the first PWM control circuit 13 is electrically connected to the first power conversion module 101;
  • the first input terminal of the second PWM control circuit 14 is electrically connected to the third output terminal OUT3 of the second step-down filter module 104 , and the output terminal of the second PWM control circuit 14 is electrically connected to the second power conversion module 102 .
  • the first PWM control circuit 13 and the second PWM control circuit 14 can not only monitor the output state of the step-down filter module, but also provide control signals required by the power conversion module.
  • the main function of the first PWM control circuit 13 and the second PWM control circuit 14 is to convert the amplitude of the input voltage into a pulse with a certain width, convert the voltage amplitude into a pulse signal, and control the output voltage of the power conversion module through the pulse signal.
  • the first PWM control circuit 13 and the second PWM control circuit 14 can improve the stability of the voltage output by the first step-down filter module 103 and the second step-down filter module 104 .
  • the power supply circuit further includes:
  • the input end of the first protection circuit 15 is electrically connected to the first output end OUT1 of the first step-down filter module 103, and the output end of the first protection circuit 15 is electrically connected to the second input end of the first PWM control circuit 13;
  • the input terminal of the second protection circuit 16 is electrically connected to the third output terminal OUT3 of the second step-down filter module 104 , and the output terminal of the second protection circuit 16 is electrically connected to the second input terminal of the second PWM control circuit 14 .
  • the first protection circuit 15 and the second protection circuit 16 can realize short circuit, current limiting and overvoltage protection, so as to protect the power circuit and improve the safety and stability of the power circuit.
  • An embodiment of the present application further provides a display screen, which includes: a plurality of lamp beads and the power supply circuit provided in any embodiment of the present application.
  • Fig. 7 is a schematic structural diagram of a common-anode LED lamp bead circuit provided by the embodiment of the present application
  • Fig. 8 is a schematic structural diagram of a common-cathode LED lamp bead circuit provided by the embodiment of the present application.
  • the cathode or the anode are connected together, that is, the common anode and the common cathode are two kinds of LED lamp beads.
  • the common cathode that is, the cathodes of R, G, and B are connected together
  • the common anode that is, the anodes of R, G, and B are connected together.
  • the lamp bead is a common-cathode lamp bead, and the second output terminal OUT2 of the first step-down filter module 103 of the power circuit and the fourth output terminal OUT2 of the second step-down filter module 104 of the power circuit are electrically connected to each other.
  • the lamp bead is a common anode lamp bead
  • the first output terminal OUT1 of the first step-down filter module 103 of the power circuit is electrically connected to the third output terminal OUT3 of the second step-down filter module 104 of the power circuit.
  • Common cathode lamp beads or common anode lamp beads because the common poles are connected together, so a lamp bead only needs four pins, which can reduce the consumption of lamp bead materials, and the size of the lamp bead can be made small. Therefore, common yang and yin or common yin and yin LEDs are the two mainstream lamp bead forms in the industry.
  • the second output terminal OUT2 of the first step-down filter module 103 of the power supply circuit is connected to the fourth output terminal OUT4 of the second step-down filter module 104 of the power supply circuit,
  • the first output terminal OUT1 of the first step-down filter module 103 of the power supply circuit and the third output terminal OUT3 of the second step-down filter module 104 of the power supply circuit output independently.
  • the second voltage signal output by the second output terminal OUT2 is 0V
  • the second output terminal OUT2 and the fourth output terminal OUT4 are connected in series, therefore, the output voltage of the fourth output terminal OUT4 is also pulled down to 0V; the third voltage
  • the voltage difference between the signal and the fourth voltage signal may be 2.8V, therefore, the third output terminal OUT3 outputs 2.8V.
  • the first output terminal OUT1 outputs 3.8V
  • the second output terminal OUT2 outputs 0V
  • the third output terminal OUT3 outputs 2.8V
  • the fourth output terminal OUT4 outputs 0V.
  • the third output terminal OUT3 and the fourth output terminal OUT4 supply power to the red light-emitting chip, while the first output terminal OUT1 and the second output terminal OUT2 supply power to the green/blue light-emitting chip. At this time, the voltage requirements of the common cathode LED lamp bead are met.
  • the first output terminal OUT1 of the first step-down filter module 103 of the power supply circuit is connected to the third output terminal OUT3 of the second step-down filter module 104 of the power supply circuit, and the first output terminal OUT3 of the second step-down filter module 104 of the power supply circuit is connected.
  • the second output terminal OUT2 of the step-down filter module 103 and the fourth output terminal OUT4 of the second step-down filter module 104 of the power circuit output independently.
  • the third output terminal OUT3 The voltage is pulled up to 3.8V; since the voltage difference between the third voltage signal and the fourth voltage signal may be 2.8V, the fourth output terminal OUT4 outputs 1V.
  • the first output terminal OUT1 outputs 3.8V
  • the second output terminal OUT2 outputs 0V
  • the third output terminal OUT3 outputs 3.8V
  • the fourth output terminal OUT4 outputs 1V.
  • the third output terminal OUT3 and the fourth output terminal OUT4 supply power to the red light-emitting chip, while the first output terminal OUT1 and the second output terminal OUT2 supply power to the green/blue light-emitting chip. At this time, the voltage requirement of the common anode LED lamp bead is met.
  • the embodiment of the present application does not need to provide two kinds of power sources, which is flexible and practical.
  • the power supply circuit of the embodiment of the present application provides different power supply voltages for chips with different VF values, so as to prevent chips with smaller VF values and chips with larger VF values from being powered by the same voltage, reduce power consumption, and achieve the purpose of saving electric energy.
  • it also greatly reduces the heat generation of the LED light-emitting chip and the temperature of the PN junction, thereby reducing the probability of damage to the LED lamp beads, making the display work at the most suitable voltage, thereby improving the stability of the product.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

提供了一种电源电路及显示屏。电源电路包括：第一降压滤波模块（103）通过第一输出端输出第一电压信号，通过第二输出端输出第二电压信号；第二降压滤波模块（104）通过第三输出端输出第三电压信号，通过第四输出端输出第四电压信号；第一电压信号和第二电压信号的第一压差固定，第三电压信号和第四电压信号的第二压差固定，第一压差大于第二压差；第一输出端和第三输出端电连接或者第二输出端和第四输出端电连接。可以为共阴极显示屏供电，也可以为共阳极显示屏供电，无需设计两种电源，灵活实用，可以有效降低成本，并且可以满足LED芯片的不同电压需要，降低了能耗。

Description

一种电源电路及显示屏
本申请要求在2021年11月02日提交中国专利局、申请号为202122666340.6的中国专利申请的优先权，该申请的全部内容通过引用结合在本申请中。
技术领域
本申请实施例涉及LED驱动电路技术领域，尤其涉及一种电源电路及显示屏。
背景技术
LED显示屏的最小发光单元是LED灯珠，拥有R、G、B三原色，通常由R、G、B三种颜色的发光芯片组成。发光二极管具有极性，即发光二极管包括阴极和阳极。图1是相关技术提供的一种LED灯珠的结构示意图，参考图1，通常把R、G、B发光芯片封装在一个LED灯珠内部。为了节省材料，通常会把一个灯珠内三种芯片的阴极或者阳极连接在一起，即灯珠一般包括共阳和共阴两种LED灯珠。
因为LED灯珠中R、G、B三种发光芯片采用的材料不同，发光芯片的VF值(VF值即正向电压，当二极管导通时候，加在LED芯片两端的电压)也不相同。通常R发光芯片需要一种电压供电，G和B发光芯片需要另一种电压供电。
相关技术中的LED显示屏通常为R、G、B三种LED芯片采用相同的电压供电，造成能用浪费，且为满足共阴共阳两种灯珠，显示屏通常需要设计两种不同的供电电源。
发明内容
本申请提供一种电源电路及显示屏，既可以为共阴极显示屏供电，也可以为共阳极显示屏供电，无需设计两种电源，灵活实用，可以有效降低成本，并且可以满足LED芯片的不同电压需要，降低了能耗。
第一方面，本申请实施例提供了一种电源电路，该电源电路包括：
整流滤波模块、第一功率变换模块、第二功率变换模块、第一降压滤波模块和第二降压滤波模块；
所述整流滤波模块的输入端用于输入交流电信号，所述整流滤波模块的输出端分别与所述第一功率变换模块的输入端和所述第二功率变换模块的输入端 电连接，所述整流滤波模块用于对交流电信号进行整流滤波，输出高压直流电信号；
所述第一功率变换模块用于将所述高压直流电信号转化为第一高压脉冲信号，所述第二功率变换模块用于将所述高压直流电信号转化为第二高压脉冲信号；
所述第一功率变换模块的输出端与所述第一降压滤波模块的输入端电连接，所述第二功率变换模块的输出端与所述第二降压滤波模块的输入端电连接；
所述第一降压滤波模块包括第一输出端和第二输出端，所述第一降压滤波模块用于对所述第一高压脉冲信号进行降压滤波，并通过所述第一输出端输出第一电压信号，通过所述第二输出端输出第二电压信号；
所述第二降压滤波模块包括第三输出端和第四输出端，所述第二降压滤波模块用于对第二高压脉冲信号进行降压滤波，并通过所述第三输出端输出第三电压信号，通过所述第四输出端输出第四电压信号；
其中，所述第一电压信号大于所述第二电压信号，所述第三电压信号大于所述第四电压信号，所述第一电压信号和所述第二电压信号的第一压差固定，所述第三电压信号和所述第四电压信号的第二压差固定，所述第一压差大于所述第二压差；
所述第一输出端和所述第三输出端电连接或者所述第二输出端和所述第四输出端电连接。
可选地，电源电路还包括：
连接器，所述连接器用于连接所述第一输出端和所述第三输出端，或者，所述连接器用于连接所述第二输出端和所述第四输出端。
可选地，电源电路还包括：
第一开关和第二开关；
所述第一开关的第一端与所述第一输出端电连接，所述第一开关的第二端与所述第三输出端电连接；所述第二开关的第一端与所述第二输出端电连接，所述第二开关的第二端与所述第四输出端电连接。
可选地，所述第一电压信号包括3.8V-4.2V，所述第二电压信号包括0V，所述第三电压信号和所述第四电压信号的压差范围包括2.8V-3.2V。
可选地，电源电路还包括：
防雷模块和电磁干扰EMI模块；
所述防雷模块的输出端与所述EMI模块的输入端电连接，所述EMI模块的输出端与所述整流滤波模块的输入端电连接。
可选地，电源电路还包括：
功率因数校正PFC模块，所述PFC模块的输入端与所述整流滤波模块电连接，输出端分别与所述第一功率变换模块和所述第二功率变换模块电连接。
可选地，电源电路还包括：
第一脉冲宽度调制PWM控制电路和第二PWM控制电路；
所述第一PWM控制电路的第一输入端与所述第一降压滤波模块的第一输出端电连接，所述第一PWM控制电路的输出端与所述第一功率变换模块电连接；
所述第二PWM控制电路的第一输入端与所述第二降压滤波模块的第三输出端电连接，所述第二PWM控制电路的输出端与所述第二功率变换模块电连接。
可选地，电源电路还包括：
第一保护电路和第二保护电路；
所述第一保护电路的输入端与所述第一降压滤波模块的第一输出端电连接，所述第一保护电路的输出端与所述第一PWM控制电路的第二输入端电连接；
所述第二保护电路的输入端与所述第二降压滤波模块的第三输出端电连接，所述第二保护电路的输出端与所述第二PWM控制电路的第二输入端电连接。
第二方面，本申请实施例还提供了一种显示屏，该显示屏包括：多个灯珠和本申请第一方面中任一项所述的电源电路。
可选地，所述灯珠为共阴极灯珠，所述电源电路的所述第一降压滤波模块的第二输出端和所述电源电路的所述第二降压滤波模块的第四输出端电连接；
或者，所述灯珠为共阳极灯珠，所述电源电路的所述第一降压滤波模块的第一输出端和所述电源电路的所述第二降压滤波模块的第三输出端电连接。
本实施例的电源电路包括第一输出端OUT1、第二输出端OUT2、第三输出端OUT3和第四输出端OUT4，第一输出端OUT1输出第一电压信号，第二输出端OUT2输出第二电压信号，第三输出端OUT3输出第三电压信号，第四输出端OUT4输出第四电压信号；第一电压信号大于第二电压信号，第三电压信号大于第四电压信号，第一电压信号和第二电压信号的第一压差固定，第三电压 信号和第四电压信号的第二压差固定，第一压差大于第二压差；通过设置第一输出端和第三输出端电连接或者第二输出端和第四输出端电连接，电源电路既可以为共阴极显示屏供电，也可以为共阳极显示屏供电，无需设计两种电源，灵活实用，可以有效降低成本，并且可以满足LED芯片的不同电压需要，降低了能耗。
附图说明
图1是相关技术提供的一种LED灯珠的结构示意图；
图2是本申请实施例提供的一种电源电路的结构示意图；
图3是本申请实施例提供的又一种电源电路的结构示意图；
图4是本申请实施例提供的又一种电源电路的结构示意图；
图5是本申请实施例提供的又一种电源电路的结构示意图；
图6是本申请实施例提供的又一种电源电路的结构示意图；
图7是本申请实施例提供的一种共阳极LED灯珠电路结构示意图；
图8是本申请实施例提供的一种共阴极LED灯珠电路结构示意图。
具体实施方式
下面结合附图和实施例对本申请作进一步的详细说明。可以理解的是，此处所描述的具体实施例仅仅用于解释本申请，而非对本申请的限定。另外还需要说明的是，为了便于描述，附图中仅示出了与本申请相关的部分而非全部结构。
图2是本申请实施例提供的一种电源电路的结构示意图，参考图2，本申请实施例提供了一种电源电路，用于对LED显示屏进行供电。该电源电路包括：整流滤波模块100、第一功率变换模块101、第二功率变换模块102、第一降压滤波模块103和第二降压滤波模块104。
整流滤波模块100的输入端用于输入交流电信号，整流滤波模块100的输出端分别与第一功率变换模块101的输入端和第二功率变换模块102的输入端电连接，整流滤波模块100用于对交流电信号进行整流滤波，输出高压直流电信号；
第一功率变换模块101用于将高压直流电信号转化为第一高压脉冲信号，第二功率变换模块102用于将高压直流电信号转化为第二高压脉冲信号；
第一功率变换模块101的输出端与第一降压滤波模块103的输入端电连接， 第二功率变换模块102的输出端与第二降压滤波模块104的输入端电连接；
第一降压滤波模块103包括第一输出端OUT1和第二输出端OUT2，第一降压滤波模块103用于对第一高压脉冲信号进行降压滤波，并通过第一输出端OUT1输出第一电压信号，通过第二输出端OUT2输出第二电压信号；
第二降压滤波模块104包括第三输出端OUT3和第四输出端OUT4，第二降压滤波模块104用于对第二高压脉冲信号进行降压滤波，并通过第三输出端OUT3输出第三电压信号，通过第四输出端OUT4输出第四电压信号；
其中，第一电压信号大于第二电压信号，第三电压信号大于第四电压信号，第一电压信号和第二电压信号的第一压差固定，第三电压信号和第四电压信号的第二压差固定，第一压差大于第二压差；第一输出端和第三输出端电连接或者第二输出端和第四输出端电连接。
其中，交流电信号可以为交流220V市电。整流滤波模块100用于对交流电信号进行整流滤波，输出高压直流电信号。整流滤波模块100的整流电路可以利用二极管的单向导电特性，将方向变化的交流电整流为直流电；交流电经整流后得到的是脉动直流，所含交流纹波很大，滤波电路可以降低交流纹波成分，让整流后的电压波形变得比较平滑。
第一功率变换模块101和第二功率变换模块102主要包括开关管以及控制电路，用于将整流滤波模块100输出的高压直流电压信号变为高频的第一高压脉冲信号和第二高压脉冲信号。
第一降压滤波模块103和第二降压滤波模块104包括第一降压单元以及第一滤波单元，第一降压单元可以是变压器，可以将高电压降低到需要的低电压，第一滤波单元利用电容的充放电作用，使输出电压趋于平滑，第一降压单元先将高压高脉冲信号转换为低压低脉冲信号，第一滤波单元再将低压低脉冲信号转换为低压直流信号。第一降压滤波模块103用于将第一高压脉冲信号变成两路电压值不同的低压恒定直流电压，通过第一输出端OUT1输出第一电压信号，第二输出端OUT2输出第二电压信号，第一电压信号大于第二电压信号，第一电压信号和第二电压信号的压差固定。第二降压滤波模块104用于将第二高压脉冲信号变成两路电压值不同的低压恒定直流电压，通过第三输出端OUT3输出第三电压信号，第四输出端OUT4输出第四电压信号。相应的，第二降压滤波模块104可以包括第二变压单元和第二滤波单元。
需要说明的是，第一电压信号、第二电压信号、第三电压信号和第四电压信号均为四个输出端没有连接时四个输出端的输出信号。当第一输出端OUT1和第三输出端OUT3电连接时，第一输出端OUT1和第三输出端OUT3等电位， 即第一输出端OUT1和第三输出端OUT3均输出第一电压信号和第三电信号中较大的电信号；当第二输出端OUT2和第四输出端OUT4电连接时，第二输出端OUT2和第四输出端OUT4等电位，均输出第二电压信号和第四电压信号中较小的信号。
当电源电路为共阴极显示屏供电时，利用开关元件或者连接元件将第二输出端OUT2与第四输出端OUT4串接在一起输出，第二输出端OUT2和第四输出端OUT4等电位，用于连接LED芯片的阴极。由于第一压差大于第二压差，因此第一输出端OUT1输出的电压大于第三输出端OUT3输出的电压，可以将第一输出端OUT1与正向电压VF值较大的LED芯片的阳极电连接，第三输出端OUT3与VF值较小的LED芯片的阳极电连接。
当电源电路为共阳极显示屏供电时，利用开关元件或者连接元件将第一输出端OUT1与第三输出端OUT3串接在一起，第一输出端OUT1与第三输出端OUT3等电位，用于连接LED芯片的阳极。由于第一压差大于第二压差，因此第二输出端OUT2输出的电压小于第四输出端OUT4输出的电压，可以将第四输出端OUT4与VF值较大的LED芯片的阴极电连接，第二输出端OUT2与VF值较小的LED芯片的阴极电连接。
本实施例的电源电路包括第一输出端OUT1、第二输出端OUT2、第三输出端OUT3和第四输出端OUT4，第一输出端OUT1输出第一电压信号，第二输出端OUT2输出第二电压信号，第三输出端OUT3输出第三电压信号，第四输出端OUT4输出第四电压信号；第一电压信号大于第二电压信号，第三电压信号大于第四电压信号，第一电压信号和第二电压信号的第一压差固定，第三电压信号和第四电压信号的第二压差固定，第一压差大于第二压差；通过设置第一输出端和第三输出端电连接或者第二输出端和第四输出端电连接，电源电路既可以为共阴极显示屏供电，也可以为共阳极显示屏供电，无需设计两种电源，灵活实用，可以有效降低成本，并且可以满足LED芯片的不同电压需要，降低了能耗。
图3是本申请实施例提供的又一种电源电路的结构示意图，参考图3，可选地，电源电路还包括：
连接器105，连接器105用于连接第一输出端OUT1和第三输出端OUT3，或者，连接器105用于连接第二输出端OUT2和第四输出端OUT4。
当电源电路为共阴极显示屏供电时，可以用连接器105将第二输出端OUT2和第四输出端OUT4电连接。当电源电路为共阳极显示屏供电时，可以用连接器105将第一输出端OUT1和第三输出端OUT3电连接。
连接器105可以为任意能够实现电连接的连接器件，示例性的，连接器105可以为导线或汇流条等。采用连接器105的形式对输出端进行连接，实现方式简单易操作。
图4是本申请实施例提供的又一种电源电路的结构示意图，参考图4，可选地，电源电路还包括：
第一开关106和第二开关107；
第一开关106的第一端与第一输出端OUT1电连接，第一开关106的第二端与第三输出端OUT3电连接；第二开关107的第一端与第二输出端OUT2电连接，第二开关107的第二端与第四输出端OUT4电连接。
本申请实施例可以通过设置第一开关106和第二开关107对输出端进行调节控制。通过控制第一开关106的开启，实现第一输出端OUT1和第三输出端OUT3的独立输出，通过控制第一开关106的闭合，实现第一输出端OUT1和第三输出端OUT3的串联输出；通过控制第二开关107的开启，实现第二输出端OUT2和第四输出端OUT4的独立输出，通过控制第二开关107的闭合，实现第二输出端OUT2和第四输出端OUT4的串联输出。通过第一开关106和第二开关107可以实现对共阴极显示屏和共阳极显示屏供电模式的任意切换。
示例性的，当电源电路为共阴极显示屏供电时，第二开关107闭合，第二输出端OUT2和第四输出端电OUT4串连在一起输出；第一开关106未闭合，第一输出端OUT1和第三输出端OUT3单独输出。当电源电路为共阳极显示屏供电时，第一开关106闭合，第一输出端OUT1和第三输出端OUT3串连在一起输出；第二开关107未闭合，第二输出端OUT2和第四输出端电OUT4单独输出。
可选地，第一电压信号包括3.8V-4.2V，第二电压信号包括0V，第三电压信号和第四电压信号的压差范围包括2.8V-3.2V。
因为LED灯珠R、G、B三种发光芯片采用的材料不同。因此，R、G、B三种发光芯片的VF值也不相同，具体参考表1。
表1
Figure PCTCN2022127988-appb-000001
通常R发光芯片的VF值在1.8-2.4V之间，而G、B发光芯片的VF值在 2.5-3.2V之间，通过设置第一电压信号为3.8V-4.2V，第二电压信号为0V，第三电压信号和第四电压信号的压差范围为2.8V-3.2V，可以对由于整体线路、LED发光控制芯片以及压降线路损耗等电损耗进行一定的补偿，满足为LED发光芯片供电的电压需求。
示例性的，第一电压信号可以为3.8V，第二电压信号可以为0V，第三电压信号可以为2.8V，第四电压信号可以为0V；第一电压信号可以为4.2V，第二电压信号可以为0V，第三电压信号可以为3.2V，第四电压信号可以为0V。
图5是本申请实施例提供的又一种电源电路的结构示意图，参考图5，可选地，电源电路还包括：
防雷模块10和EMI模块11；
防雷模块10的输出端与EMI模块11的输入端电连接，EMI模块11的输出端与整流滤波模块100的输入端电连接。
防雷模块10可以防止雷电和其他内部过电压侵入而造成损坏，从而保护电源电路，提升其安全性和稳定性。EMI模块11主要用于抑制电磁干扰，防止交流输入中的电磁噪声和杂波信号干扰电源，同时防止电源本身产生的高频杂波对交流输入造成干扰。
继续参考图5，可选地，电源电路还包括：
PFC模块12，PFC模块的输入端与整流滤波模块100电连接，输出端分别与第一功率变换模块101和第二功率变换模块102电连接。
PFC模块12可以提高功率因数，减少谐波含量，提高电源效率。
图6是本申请实施例提供的又一种电源电路的结构示意图，参考图6，可选地，电源电路还包括：
第一PWM控制电路13和第二PWM控制电路14；
第一PWM控制电路13的第一输入端与第一降压滤波模块103的第一输出端OUT1电连接，第一PWM控制电路13的输出端与第一功率变换模块101电连接；
第二PWM控制电路14的第一输入端与第二降压滤波模块104的第三输出端OUT3电连接，第二PWM控制电路14的输出端与第二功率变换模块102电连接。
第一PWM控制电路13和第二PWM控制电路14除了可以监控降压滤波模块的输出状态之外，同时还提供功率变换模块所需要的控制信号。第一PWM控制电路13和第二PWM控制电路14主要功能是将输入电压的振幅转换成宽度一 定的脉冲，将电压振幅转换成脉冲信号，通过该脉冲信号控制功率变换模块的输出电压，通过设置第一PWM控制电路13和第二PWM控制电路14，可以提高第一降压滤波模块103和第二降压滤波模块104输出的电压的稳定性。
继续参考图6，可选地，电源电路还包括：
第一保护电路15和第二保护电路16；
第一保护电路15的输入端与第一降压滤波模块103的第一输出端OUT1电连接，第一保护电路15的输出端与第一PWM控制电路13的第二输入端电连接；
第二保护电路16的输入端与第二降压滤波模块104的第三输出端OUT3电连接，第二保护电路16的输出端与第二PWM控制电路14的第二输入端电连接。
第一保护电路15和第二保护电路16可以实现短路、限流以及过压保护，从而保护电源电路，提升电源电路的安全性和稳定性。
本申请实施例还提供了一种显示屏，该显示屏包括：多个灯珠和本申请任意实施例提供的电源电路。
图7是本申请实施例提供的一种共阳极LED灯珠电路结构示意图，图8是本申请实施例提供的一种共阴极LED灯珠电路结构示意图，参考图7-8，为了节省材料，通常会把阴极或者阳极连接在一起，即共阳极和共阴极两种LED灯珠。共阴极即R、G、B的阴极连接在一起，共阳极即R、G、B的阳极连接在一起。
继续参考图4，可选地，灯珠为共阴极灯珠，电源电路的第一降压滤波模块103的第二输出端OUT2和电源电路的第二降压滤波模块104的第四输出端电OUT4连接；
或者，灯珠为共阳极灯珠，电源电路的第一降压滤波模块103的第一输出端OUT1和电源电路的第二降压滤波模块104的第三输出端OUT3电连接。
共阴极灯珠或共阳极灯珠，由于公共极是连接在一起的，因此一个灯珠只需要四个引脚，这样可以减少灯珠材料的消耗，且灯珠尺寸可以做小。因此，共阳阴或共阴阴LED是行业内主流的两种灯珠形态。
示例性的，当灯珠为共阴极灯珠时，电源电路的第一降压滤波模块103的第二输出端OUT2和电源电路的第二降压滤波模块104的第四输出端电OUT4连接，电源电路的第一降压滤波模块103的第一输出端OUT1和电源电路的第二降压滤波模块104的第三输出端OUT3独立输出。若第二输出端OUT2输出的第二电压信号为0V，第二输出端OUT2和第四输出端电OUT4串联，因此，第四输出端电OUT4的输出电压也被拉低到0V；第三电压信号和第四电压信号 的压差可以为2.8V，因此，第三输出端OUT3输出2.8V。此模式下，第一输出端OUT1输出3.8V，第二输出端OUT2输出0V，第三输出端OUT3输出2.8V，第四输出端OUT4输出0V。第三输出端OUT3和第四输出端OUT4给红色发光芯片供电，而第一输出端OUT1和第二输出端OUT2给绿/蓝色发光芯片供电。此时满足共阴极LED灯珠的电压需求。
当灯珠为共阳极灯珠时，电源电路的第一降压滤波模块103的第一输出端OUT1和电源电路的第二降压滤波模块104的第三输出端OUT3连接，电源电路的第一降压滤波模块103的第二输出端OUT2和电源电路的第二降压滤波模块104的第四输出端OUT4独立输出。若第一输出端OUT1输出的第一电压信号为3.8V，第二输出端输出的第二电压信号为0V，第一输出端OUT1和第三输出端OUT3串联，因此，第三输出端OUT3的电压被拉高到3.8V；由于第三电压信号和第四电压信号之间的电压差可以为2.8V，因此，第四输出端OUT4输出1V。此模式下，第一输出端OUT1输出3.8V，第二输出端OUT2输出0V，第三输出端OUT3输出3.8V，第四输出端OUT4输出1V。第三输出端OUT3和第四输出端OUT4给红色发光芯片供电，而第一输出端OUT1和第二输出端OUT2给绿/蓝色发光芯片供电。此时满足共阳极LED灯珠的电压需求。
本申请实施例不需要提供两种电源，灵活实用。本申请实施例的电源电路为不同VF值的芯片提供不同的供电电压，避免VF值较小的芯片与VF值较大的芯片采用相同的电压供电，降低了功耗，实现节省电能的目的。此外还大幅降低LED发光芯片的发热，降低PN结温度，从而降低了LED灯珠的损坏概率，使显示屏在最合适的电压下工作，从而提高产品的稳定性。

Claims (10)

  1. 一种电源电路，包括：
    整流滤波模块、第一功率变换模块、第二功率变换模块、第一降压滤波模块和第二降压滤波模块；
    所述整流滤波模块的输入端用于输入交流电信号，所述整流滤波模块的输出端分别与所述第一功率变换模块的输入端和所述第二功率变换模块的输入端电连接，所述整流滤波模块用于对交流电信号进行整流滤波，输出高压直流电信号；
    所述第一功率变换模块用于将所述高压直流电信号转化为第一高压脉冲信号，所述第二功率变换模块用于将所述高压直流电信号转化为第二高压脉冲信号；
    所述第一功率变换模块的输出端与所述第一降压滤波模块的输入端电连接，所述第二功率变换模块的输出端与所述第二降压滤波模块的输入端电连接；
    所述第一降压滤波模块包括第一输出端和第二输出端，所述第一降压滤波模块用于对所述第一高压脉冲信号进行降压滤波，并通过所述第一输出端输出第一电压信号，通过所述第二输出端输出第二电压信号；
    所述第二降压滤波模块包括第三输出端和第四输出端，所述第二降压滤波模块用于对第二高压脉冲信号进行降压滤波，并通过所述第三输出端输出第三电压信号，通过所述第四输出端输出第四电压信号；
    其中，所述第一电压信号大于所述第二电压信号，所述第三电压信号大于所述第四电压信号，所述第一电压信号和所述第二电压信号的第一压差固定，所述第三电压信号和所述第四电压信号的第二压差固定，所述第一压差大于所述第二压差；
    所述第一输出端和所述第三输出端电连接或者所述第二输出端和所述第四输出端电连接。
  2. 根据权利要求1所述的电源电路，还包括：
    连接器，所述连接器用于连接所述第一输出端和所述第三输出端，或者，所述连接器用于连接所述第二输出端和所述第四输出端。
  3. 根据权利要求1所述的电源电路，还包括：
    第一开关和第二开关；
    所述第一开关的第一端与所述第一输出端电连接，所述第一开关的第二端与所述第三输出端电连接；所述第二开关的第一端与所述第二输出端电连接，所述第二开关的第二端与所述第四输出端电连接。
  4. 根据权利要求1所述的电源电路，其中，
    所述第一电压信号包括3.8V-4.2V，所述第二电压信号包括0V，所述第三电压信号和所述第四电压信号的压差范围包括2.8V-3.2V。
  5. 根据权利要求1所述的电源电路，还包括：
    防雷模块和电磁干扰EMI模块；
    所述防雷模块的输出端与所述EMI模块的输入端电连接，所述EMI模块的输出端与所述整流滤波模块的输入端电连接。
  6. 根据权利要求1所述的电源电路，还包括：
    功率因数校正PFC模块，所述PFC模块的输入端与所述整流滤波模块电连接，输出端分别与所述第一功率变换模块和所述第二功率变换模块电连接。
  7. 根据权利要求1所述的电源电路，还包括：
    第一脉冲宽度调制PWM控制电路和第二PWM控制电路；
    所述第一PWM控制电路的第一输入端与所述第一降压滤波模块的第一输出端电连接，所述第一PWM控制电路的输出端与所述第一功率变换模块电连接；
    所述第二PWM控制电路的第一输入端与所述第二降压滤波模块的第三输出端电连接，所述第二PWM控制电路的输出端与所述第二功率变换模块电连接。
  8. 根据权利要求7所述的电源电路，还包括：
    第一保护电路和第二保护电路；
    所述第一保护电路的输入端与所述第一降压滤波模块的第一输出端电连接，所述第一保护电路的输出端与所述第一PWM控制电路的第二输入端电连接；
    所述第二保护电路的输入端与所述第二降压滤波模块的第三输出端电连接，所述第二保护电路的输出端与所述第二PWM控制电路的第二输入端电连接。
  9. 一种显示屏，包括多个灯珠和权利要求1-8任一项所述的电源电路。
  10. 根据权利要求9所述的显示屏，其中，
    所述灯珠为共阴极灯珠，所述电源电路的所述第一降压滤波模块的第二输出端和所述电源电路的所述第二降压滤波模块的第四输出端电连接；
    或者，所述灯珠为共阳极灯珠，所述电源电路的所述第一降压滤波模块的第一输出端和所述电源电路的所述第二降压滤波模块的第三输出端电连接。
PCT/CN2022/127988 2021-11-02 2022-10-27 一种电源电路及显示屏 WO2023078157A1 (zh)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202122666340.6U CN216290646U (zh) 2021-11-02 2021-11-02 一种电源电路及显示屏
CN202122666340.6 2021-11-02

Publications (1)

Publication Number Publication Date
WO2023078157A1 true WO2023078157A1 (zh) 2023-05-11

Family

ID=81003522

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2022/127988 WO2023078157A1 (zh) 2021-11-02 2022-10-27 一种电源电路及显示屏

Country Status (2)

Country Link
CN (1) CN216290646U (zh)
WO (1) WO2023078157A1 (zh)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN216290646U (zh) * 2021-11-02 2022-04-12 西安青松光电技术有限公司 一种电源电路及显示屏

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201725543U (zh) * 2010-06-07 2011-01-26 福建科维光电科技有限公司 一种led全彩屏节能电路
CN206134209U (zh) * 2016-08-24 2017-04-26 合肥集创微电子科技有限公司 Led显示屏及其控制电路
US20190069363A1 (en) * 2017-08-25 2019-02-28 Wanjiong Lin Dimming control power supply for led lamps
CN211630456U (zh) * 2020-03-24 2020-10-02 厦门强力巨彩光电科技有限公司 一种共阳双路节能电源
CN112349239A (zh) * 2019-07-22 2021-02-09 深圳蓝普科技有限公司 一种led显示屏节能供电电路及显示屏
CN212906894U (zh) * 2020-09-18 2021-04-06 广州视源电子科技股份有限公司 Led显示屏及电子设备
CN216290646U (zh) * 2021-11-02 2022-04-12 西安青松光电技术有限公司 一种电源电路及显示屏

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201725543U (zh) * 2010-06-07 2011-01-26 福建科维光电科技有限公司 一种led全彩屏节能电路
CN206134209U (zh) * 2016-08-24 2017-04-26 合肥集创微电子科技有限公司 Led显示屏及其控制电路
US20190069363A1 (en) * 2017-08-25 2019-02-28 Wanjiong Lin Dimming control power supply for led lamps
CN112349239A (zh) * 2019-07-22 2021-02-09 深圳蓝普科技有限公司 一种led显示屏节能供电电路及显示屏
CN211630456U (zh) * 2020-03-24 2020-10-02 厦门强力巨彩光电科技有限公司 一种共阳双路节能电源
CN212906894U (zh) * 2020-09-18 2021-04-06 广州视源电子科技股份有限公司 Led显示屏及电子设备
CN216290646U (zh) * 2021-11-02 2022-04-12 西安青松光电技术有限公司 一种电源电路及显示屏

Also Published As

Publication number Publication date
CN216290646U (zh) 2022-04-12

Similar Documents

Publication Publication Date Title
CN102752940B (zh) 一种高效率的led驱动电路及其驱动方法
CN106488607A (zh) 开关电源及电视机
WO2015024529A1 (zh) Led交流驱动电路
TWI442812B (zh) 負載驅動裝置及其方法
CN101925230A (zh) 高效率低功耗低成本led驱动电源
WO2023078157A1 (zh) 一种电源电路及显示屏
CN109152134A (zh) 多路调光驱动系统
US20240324082A1 (en) Display device and display control method
CN105307305B (zh) 一种led电源控制装置及电视机
KR20130135744A (ko) Ｌｅｄ 백라이트를 구비하는 디스플레이 장치와 그 전원 공급 장치 및 방법
CN211509378U (zh) 一种反激式led稳压恒流驱动电源
CN202085071U (zh) 非隔离型反激式升压转换器
CN112383235B (zh) Led户外广告屏并联使用供电装置
Hsu et al. A single stage single switch valley switching Flyback-Forward converter with regenerative snubber and PFC for LED light source system
CN206100550U (zh) 一种无频闪高功率因数宽电压输入非隔离日光灯电源电路
CN202907268U (zh) Led驱动电路
CN209105035U (zh) 一种dc-dc降压隔离电路
CN202738194U (zh) 一种gu10调光电源
CN112333889A (zh) 一种双直驱led电源电路和电视机
CN201438773U (zh) 一种led调光装置
CN102374448B (zh) 照明装置
CN111385942B (zh) 一种提高pf值的led灯驱动电路
CN219678328U (zh) 一种非隔离式供电电路及灯具
CN207304995U (zh) 一种低功耗led应急灯具
CN215379289U (zh) 一种吸收模块、调光电路及发光装置

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 22889182

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE