CN110784095A - High-efficiency switching power supply circuit and LED display screen - Google Patents

High-efficiency switching power supply circuit and LED display screen Download PDF

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Publication number
CN110784095A
CN110784095A CN201911056516.7A CN201911056516A CN110784095A CN 110784095 A CN110784095 A CN 110784095A CN 201911056516 A CN201911056516 A CN 201911056516A CN 110784095 A CN110784095 A CN 110784095A
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China
Prior art keywords
power supply
module
current
sharing
voltage
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CN201911056516.7A
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Chinese (zh)
Inventor
金重星
何昆鹏
吴振志
吴涵渠
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Shenzhen Aoto Electronics Co Ltd
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Shenzhen Aoto Electronics Co Ltd
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Priority to CN201911056516.7A priority Critical patent/CN110784095A/en
Publication of CN110784095A publication Critical patent/CN110784095A/en
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    • 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
    • H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
    • 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
    • H02H7/12—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 for static converters or rectifiers
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H02J9/005—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting using a power saving mode
    • 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
    • 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
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
    • Y04S20/20—End-user application control systems

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The invention relates to a high-efficiency switching power supply circuit and an LED display screen, wherein the switching power supply circuit comprises a switching module, a power supply management module, at least two switching power supply modules, a power supply input end and a power supply output end; the switching power supply modules are connected in parallel; the switch module comprises a plurality of switches connected in parallel, and at least one switch power supply module is connected with the power supply input end through the switch; and the power supply management module is connected with at least one switching power supply module to acquire the electric energy output data of the switching power supply module and control the switch to be turned on or off according to the acquired electric energy output data so as to turn on or turn off the switching power supply module connected with the switch. The plurality of switching power supply modules are arranged in parallel and connected with the power supply input end through a switch; through opening and closing of the switch, the switch power supply module can be dynamically opened according to the load power, the load power is met, meanwhile, the power supply efficiency is maintained at a high level, the energy-saving effect is improved, and the power supply cost is reduced.

Description

High-efficiency switching power supply circuit and LED display screen
Technical Field
The invention relates to the field of power supply control, in particular to a high-efficiency switching power supply circuit and an LED display screen.
Background
At present, a switching power supply is generally used in an LED display screen to supply electric energy. The switching power supply is generally designed in consideration of the peak power consumption of the LED display screen (i.e., in full white display).
With the progress of technology and the development of economy, more and more attention is paid to environmental protection and energy conservation. At present, LED display screen enterprises also strive to improve the efficiency of switching power supplies so as to reduce energy consumption and meet the energy-saving requirement. In order to improve the efficiency of the switching power supply on the LED display screen, it is generally assumed that the switching power supply operates at a peak power consumption level, and on the basis of the peak power consumption level, the circuit is optimally designed to improve the power supply efficiency. The power supply optimization scheme is aimed at peak power consumption, namely, high current and high voltage, so that the requirements on circuit design and device type selection are very high, and the cost is relatively high. Moreover, the conversion efficiency of the switching power supply can be maintained at a high level only when the load reaches more than 50% of the peak power consumption. When the LED display screen is normally used, the operation power consumption is usually only 20% -30% of the peak power consumption, and even is at a lower level. At this time, the conversion efficiency of the switching power supply is very low, and the requirements of environmental protection and energy saving cannot be met.
Therefore, the switching power supply used by the existing LED display screen has too high requirements on circuit design and device type selection in the design of a scheme for improving the power supply efficiency, so that the power supply cost is greatly increased; meanwhile, the energy-saving effect during normal use is not obvious, and the energy-saving requirement during normal use of the LED display screen cannot be met.
Disclosure of Invention
Therefore, it is necessary to provide a high-efficiency switching power supply circuit and an LED display screen for solving the problems of high cost and insignificant energy saving effect in normal use of the conventional switching power supply of the LED display screen.
An embodiment of the invention provides a high-efficiency switching power supply circuit, which comprises a switching module, a power supply management module, at least two switching power supply modules, a power supply input end and a power supply output end, wherein the switching power supply modules are connected with the power supply management module;
the switching power supply modules are mutually connected in parallel and connected to the power supply output end, and the switching power supply modules are directly or indirectly connected with the power supply input end;
the switch module comprises a plurality of switches connected in parallel, and at least one switch power supply module is connected with the power supply input end through the switch;
the power supply management module is connected with at least one switch power supply module to acquire electric energy output data of the switch power supply module; the power management module is connected with the switch module, and controls the switch in the switch module to be turned on or off according to the acquired electric energy output data so as to turn on or turn off the switch power supply module connected with the switch.
In some embodiments, each of the switching power supply modules is connected to the power supply input terminal through one of the switches.
In some embodiments, at least one of said switching power supply modules is connected to said power supply input through one of said switches; at least one of the switching power supply modules is directly connected to the power supply input terminal.
In some embodiments, the switching power supply module includes: an input end, an output end, an input side rectifying and filtering module, a power conversion module, an output side rectifying and filtering module, an output sampling module and a PWM control module,
the input side rectifying and filtering module is connected with the input end and is used for rectifying and filtering alternating current input to obtain direct current voltage;
the power conversion module is connected with the input side rectification filter module and is used for converting the direct-current voltage into low-voltage pulse voltage;
the output side rectifying and filtering module is connected with the power conversion module, and is used for rectifying and filtering the low-voltage pulse voltage to obtain an output voltage which is connected with the output end for output;
the output sampling module is used for sampling the output voltage to obtain a sampling signal;
the PWM control module is connected with the output sampling module and the power conversion module, and controls the working state of the power conversion module according to the sampling signal to adjust the output voltage of the output side rectification filter module.
In some embodiments, the switching power supply module further includes a PFC module, and the PFC module is connected to the input side rectifying and filtering module and the power conversion module, and is configured to correct phases of a voltage and a current of the ac input.
In some embodiments, the switching power supply module further includes a current-sharing module connected to the output sampling module and the PWM control module, the current-sharing module is connected to current-sharing modules of other switching power supply modules through a current-sharing bus, and the current-sharing module obtains a current-sharing bus voltage on the current-sharing bus; the current-sharing module acquires the sampling signal from the output sampling module, compares the sampling signal with the current-sharing bus voltage, and regulates the output voltage by controlling the PWM control module.
In some embodiments, the current equalizing module is one of a regulated output impedance circuit, a master-slave setting circuit, an average current automatic current equalizing circuit, and a maximum current automatic current equalizing circuit.
In some embodiments, the current equalizing module is a maximum current automatic current equalizing circuit, and comprises a current amplifier, a current equalizing error amplifier, a reference voltage regulator, a voltage error amplifier and a diode,
the current amplifier is connected with the output sampling module to obtain sampling current, and the sampling current is processed to obtain current-sharing comparison voltage which is output to the current-sharing error amplifier;
the current-sharing error amplifier respectively acquires the current-sharing comparison voltage from the current amplifier and acquires the current-sharing bus voltage from a current-sharing bus, and the current-sharing error voltage is obtained through comparison processing;
the reference voltage regulator is connected with the current-sharing error amplifier and the voltage error amplifier, and acquires the current-sharing error voltage and a reference voltage, and the current-sharing error voltage and the reference voltage are superposed to obtain a current-sharing control voltage;
the voltage error amplifier is connected with the output sampling module and the reference voltage regulator, respectively obtains sampling voltage from the output sampling module and the current-sharing control voltage from the reference voltage regulator, and outputs a current-sharing control signal after comparison processing to control the PWM control module to carry out output regulation;
the anode of the diode is connected with the current amplifier, and the cathode of the diode is connected with a current equalizing bus; when the current-sharing comparison voltage output by the current amplifier is larger than the current-sharing bus voltage on the current-sharing bus, the diode is conducted.
In some embodiments, the switching power supply module further includes an output side protection circuit, connected to the output terminal and the PWM control module, and configured to detect the output of the output terminal, and when it is determined that there is an abnormality in the output of the output terminal, control the PWM control module to turn off the power conversion module.
Another embodiment of the present invention further provides an LED display screen, which includes a plurality of LED display units and at least one power supply, wherein the LED display units are spliced to form the LED display screen, the power supply is electrically connected to the LED display units, the power supply supplies power to the LED display units, and the power supply is the high-efficiency switching power supply circuit described in any one of the foregoing embodiments.
According to the high-efficiency switching power supply circuit provided by the embodiment of the invention, a plurality of switching power supply modules are connected in parallel, and a switch is arranged on a path of each switching power supply module; the power management module can acquire the electric energy output data of the switching power supply module to judge the power required by the load, and then dynamically control the opening and closing of the switch according to the power required by the load to open or close the corresponding switching power supply module, so that the power requirement of the load is met, the power efficiency is maintained at a higher level, the energy consumption of the switching power supply is reduced, and the energy-saving effect can be effectively guaranteed. Meanwhile, a plurality of switching power supply modules are combined in a parallel connection mode, the current and the voltage borne by each switching power supply module are in a lower level, requirements on devices are relatively low, and the cost of the whole power supply can be effectively reduced.
Drawings
Fig. 1 is a schematic diagram of a frame structure of a switching power supply circuit according to an embodiment of the invention;
fig. 2 is a schematic diagram of a frame structure of a switching power supply circuit according to another embodiment of the invention;
fig. 3 is a schematic diagram of a frame structure of a switching power supply module according to an embodiment of the invention;
fig. 4 is a circuit diagram of a current equalizing module according to an embodiment of the present invention.
Detailed Description
So that the manner in which the above recited objects, features and advantages of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to the embodiments thereof which are illustrated in the appended drawings. In addition, the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
As shown In fig. 1, an embodiment of the present invention provides a high-efficiency switching power supply circuit, which includes a switching module 10, a power management module 20, at least two switching power supply modules 30, a power input terminal In and a power output terminal Out;
the switching power supply modules 30 are connected In parallel with each other and connected to the power output terminal Out, and the switching power supply modules 30 are directly or indirectly connected to the power input terminal In;
the switch module 10 comprises a plurality of switches 11 connected In parallel, and at least one switch power supply module 30 is connected with a power supply input end In through the switches 11;
the power management module 20 is connected with at least one switching power supply module 30 to acquire electric energy output data of the switching power supply module 30; the power management module 20 is connected to the switch module 10, and the power management module 20 controls the switch 11 in the switch module 10 to be turned on or off according to the acquired power output data, so as to control the switch power module 30 connected to the switch 11 to be turned on or off.
As shown in fig. 1, all the switching power supply modules 30 are connected in parallel with each other. The output terminals of the switching power supply modules 30 are all connected to the power output terminal Out. Thus, a large switching power supply, such as a high-power switching power supply, can be realized by jointly using a plurality of small switching power supply modules 30, such as low-power switching power supply modules. It will be appreciated that in addition to power considerations, stabilization based on voltage, current, etc. parameters may be required to jointly use a plurality of small switching power supply modules. For simplicity, in the following embodiments, the switching power supply modules 30 are used in parallel to form a high-power switching power supply by using low-power switching power supply modules.
The power input terminal In is connected to an external power source, such as an external ac power source, a dc power source, etc. Illustratively, the power input terminal In is connected to the mains AC. The switching power supply module 30 can convert the input external power, such as ac power, into power adapted to drive the load, such as dc power meeting the voltage amplitude requirement. The plurality of switching power supply modules 30 may be identical, such as switching power supply modules that all provide the same power, and may each provide 200W power, for example. When a high-power switching power supply is obtained by combination, only the corresponding number of switching power supply modules 30 need to be turned on, for example, when 600W is obtained by combination, only 3 switching power supply modules 30 of 200W need to be provided. The switching power supply modules 30 may also be different, such as switching power supply modules providing different powers, for example, the power provided may be different powers of 100W, 200W, 300W, 400W, and so on. When a high-power switching power supply is obtained by combination, for example, 600W, it may need to be determined which combination mode is adopted, which more meets the actual requirement, for example, there may be various combinations of 100W +200W +300W, 200W +400W, and the like. The combination meeting the requirements can be selected according to the actual power consumption condition and the preset control principle. The switching power supply modules with different powers are arranged, so that the combination result is more precise, the difference value between adjacent combinations is relatively small, and the refined power supply management can be realized.
In the exemplary switching power supply circuit, all the switching power supply modules 30 are the same switching power supply.
The switch module 10 includes a plurality of switches 11 connected in parallel. Each switch 11 comprises a first terminal, a second terminal and a control terminal, the first terminal of the switch 11 can be connected to the power input terminal In, the second terminal can be connected to the input terminal of the switching power supply module 30, and the control terminal can be connected to the power management module 20. The power management module 20 controls the control terminal to control the switch 11 to be turned on or off. The switch 11 may be a relay, for example. It is understood that the switch 11 may be other switching devices as long as the requirements of the voltage at the input end of the power supply and the power supply are met.
In some embodiments, as shown In fig. 1, the input terminals of all the switching power supply modules 30 are connected to one switch 11, and connected to the power supply input terminal In through the switch 11. Thus, all the switching power supply modules 30 are indirectly connected to the power input terminal In — a switch 11 is disposed on a path between each switching power supply module 30 and the power input terminal In. For each switching power supply module 30, the connection condition between the switching power supply module 30 and the power input end In can be controlled by controlling the on and off of the switch 11 on the path, so as to control the on and off of the switching power supply module 30 and adjust the external output size of the switching power supply circuit.
In some embodiments, the input of at least one switching power supply module 30 is directly connected to the power supply input In; the input terminals of the other switching power supply modules 30 are respectively connected to one switch 11, and are connected to the power supply input terminal In through the switch 11. In the example of fig. 2, 4 switching power supply modules 30 are shown, wherein the input of the switching power supply module 1 is directly connected to the power supply input In, and the inputs of the switching power supply modules 2, 3, 4 are each connected to one switch 11 for indirect connection to the power supply input In. In this manner, some of the switching power modules 30 are in the default on state, and do not need to be controlled by the power management module 20 to provide the basic power output. When the power required by the load is higher than the power provided by the default turned-on switching power supply module 30, the power management module 20 turns on some or all of the switches 11 to turn on the corresponding switching power supply module 30, so as to meet the power requirement of the load. If the power of the load is increased step by step, the number of the switches 11 to be turned on is also increased accordingly. When the power of the load falls back, some of the switches 11 may be turned off accordingly to turn off the corresponding switching power supply module 30.
It is understood that, when all the switching power modules 30 are connected to one switch 11, the power management module 20 may also control a specific switch 11 to remain on all the time, so that the corresponding switching power module 30 is in the default on state.
The power management module 20 is connected to at least one switching power supply module 30 to obtain power output data of the switching power supply module 30. The power output data may be the output voltage and/or the output current of the switching power supply module 30. The acquisition of the power output data may be performed by sampling the output end of the connected switching power supply module 30, such as voltage sampling and power supply sampling. If the switching power module 30 provides the power management BUS (PM _ BUS), the power management module 20 may also communicate via the power management BUS to obtain the power output data.
For a switching power supply, when the load power changes, the output voltage or the output current changes. Based on the power output data, the power management module 20 may determine the amount of power required by the load. When the power management module 20 determines that the power required by the load is increased, determining the switching power supply module 30 to be additionally started according to the difference between the power required by the load and the power provided by the existing switching power supply module 30 which is already started and the principle of maintaining higher power supply efficiency; then, the corresponding switch 11 is controlled to be turned on, and the correspondingly connected switching power supply module 30 is turned on. On the contrary, when the power management module 20 determines that the power required by the load is reduced, the corresponding switch 11 is closed.
The power management module 20 determines the switching power module 30 to be turned on or off according to the principle of maintaining high power efficiency. That is, the switching power supply module 30, which is still turned on after the turning-on or turning-off operation, should be able to maintain a high power efficiency, such as 50% to 100%.
Illustratively, taking fig. 1 as an example, there are 4 switching power supply modules 30(1, 2, 3, 4), each of which can provide up to 200W of output power. When the power required by the load is lower than 200W, only the switching power supply module 1 is turned on, and the switching power supply modules 2, 3 and 4 are turned off, so that the power supply efficiency of the switching power supply module 1 can be easily achieved and maintained relatively high compared with the case that other switching power supply modules are turned on simultaneously. When the power required by the load is 200-400W, the switching power supply module 2 is additionally started, the switching power supply modules 3 and 4 are still closed, and the power supply efficiency of the switching power supply modules 1 and 2 can be maintained at 50-100% and at a higher level. When the power required by the load is 400-600W, the switching power supply module 3 is additionally started, the switching power supply module 4 is still closed, and the power supply efficiency of the switching power supply modules 1, 2 and 3 can be maintained at 67-100% and at a higher level. When the power required by the load is 600W-800W, the switching power supply module 4 is additionally started, all the switching power supply modules 30 are started, and the power supply efficiency of the switching power supply modules 1, 2, 3 and 4 can be maintained at 75% -100% and is at a higher level. So, through the increase of following load power, increase and open switching power supply module, can let holistic power efficiency maintain a higher level, reduce switching power supply's energy consumption itself, can the energy-conserving effect of effectual guarantee.
According to the high-efficiency switching power supply circuit provided by the embodiment of the invention, a plurality of switching power supply modules are connected in parallel, and a switch is arranged on a path of each switching power supply module; the power management module can acquire the electric energy output data of the switching power supply module to judge the power change required by the load, and then according to the power required by the load, the power management module controls the on and off of the switch to open or close the corresponding switching power supply module, so that the power requirement of the load is met, the power efficiency is maintained at a higher level, the energy consumption of the switching power supply is reduced, and the energy-saving effect can be effectively guaranteed. Meanwhile, a plurality of switching power supply modules are combined in a parallel connection mode, the current and the voltage borne by each switching power supply module are in a lower level, requirements on devices are relatively low, and the cost of the whole power supply can be effectively reduced.
The switching power supply module 30 may be a conventional switching power supply.
As an example, as shown in fig. 3, the switching power supply module 30 may include: an input terminal In, an output terminal Out, an input side rectifying and filtering module 310, a power conversion module 320, an output side rectifying and filtering module 330, an output sampling module 360 and a PWM control module 340,
the input side rectifying and filtering module 310 is connected with the input end In and used for rectifying and filtering alternating current input to obtain direct current voltage;
the power conversion module 320 is connected with the input side rectifying and filtering module 310 and is used for converting the direct-current voltage into low-voltage pulse voltage;
the output side rectifying and filtering module 330 is connected with the power conversion module 320, and is used for rectifying and filtering the low-voltage pulse voltage to obtain an output voltage, and is connected with the output end Out for output;
the output sampling module 360 is used for sampling the output voltage to obtain a sampling signal;
and the PWM control module 340 is connected to the output sampling module 360 and the power conversion module 320, and the PWM control module 340 controls the working state of the power conversion module 320 according to the sampling signal to adjust the output voltage of the output side rectifying and filtering module 330.
In order to improve the efficiency of the switching power supply module, the switching power supply module 30 may further include a PFC (i.e., power factor correction) module 380, where the PFC module 380 is connected to the input side rectifying and filtering module 310 and the power conversion module 320, respectively, for correcting the phases of the voltage and the current of the ac input. By arranging the PFC module, the utilization efficiency of electric energy can be improved.
In order to protect the switching power supply module and improve the protection performance, the switching power supply module 30 may further include a lightning protection module 301, an EMI module, an input under-voltage/over-voltage protection circuit 303, and an output side protection circuit 380,
the lightning protection module 301 and the EMI module 302 are connected In series between the input end In and the input side rectifying and filtering module 310;
the lightning protection module 301 is used for absorbing the residual voltage of lightning and can be formed by combining a piezoresistor and a discharge tube;
an EMI module 302 to suppress common mode noise;
the input undervoltage/overvoltage protection circuit 303 is connected with the input end In and the PWM control module 340, and is configured to sample an ac input, and when an input voltage is lower than a lower limit value of a preset voltage or higher than the upper limit value of the preset voltage, control the PWM control module 340 to turn off the power conversion module 320;
and the output side protection circuit 380 is connected with the output end Out and the PWM control module 340, and is configured to detect the output of the output end Out, and when it is determined that the output of the output end Out is abnormal, control the PWM control module 340 to turn off the power conversion module 320.
The output side protection circuit 380 may specifically include a short circuit protection circuit and an output overvoltage protection circuit, and accordingly, the output of the output terminal Out may have an abnormality corresponding to a short circuit, and the output voltage is higher than the upper limit of the output voltage.
It is understood that some switching power supply control chips may integrate the PWM control module 340 with one or both of the input under-voltage/over-voltage protection circuit 303 and the output side protection circuit 380, such as the common switching power supply control chips of UC3842, iW1688, etc.
In order to ensure that each switching power supply module 30 can dynamically and uniformly distribute load after being turned on, and ensure that the output power is basically the same, as shown in fig. 3, the switching power supply module 30 may further include a current-sharing module 370, which is connected to the output sampling module 360 and the PWM control module 340, and the current-sharing module 370 is further connected to current-sharing modules of other switching power supply modules 30 through a current-sharing bus to obtain a current-sharing bus voltage on the current-sharing bus; and the current-sharing module 370 acquires the sampling signal from the output sampling module 360, compares the sampling signal with the current-sharing bus voltage, and regulates the output voltage by controlling the PWM control module 340.
The current equalizing module 370 may adopt a common switching power supply parallel current equalizing circuit, such as an output impedance adjusting circuit, a master-slave setting method circuit, an average current automatic current equalizing circuit, a maximum current automatic current equalizing circuit, and the like.
For example, as shown in fig. 4, the current equalizing module 370, which may employ a maximum current automatic current equalizing circuit, includes: a current amplifier 371, a current-sharing error amplifier 372, a reference voltage regulator 373, a voltage error amplifier 374 and a diode D1,
the current amplifier 371 is connected with the output sampling module 360 to obtain a sampling current T YProcessed to obtain a current-sharing comparison voltage V IAnd outputs to the current sharing error amplifier 372;
a current-sharing error amplifier 372 for obtaining a current-sharing comparison voltage V from the current amplifier 371 IObtaining the voltage V of the current-sharing bus from the current-sharing bus SBObtaining a current-sharing error voltage V through comparison processing CS；
A reference voltage regulator 373 connected to the current-sharing error amplifier 372 and the voltage error amplifier 374, the reference voltage regulator 373 obtaining a current-sharing error voltage V CSAnd a reference voltage V refAnd the current-sharing control voltage V is obtained by superposition processing rc；
A voltage error amplifier 374 connected with the output sampling module 360 and the reference voltage regulator 373 for respectively obtaining the sampling voltage V from the output sampling module 360 YObtaining the current-sharing control voltage V from the reference voltage regulator 373 rcAfter the comparison treatment, the comparison treatment is carried out,outputting a current-sharing control signal to control the PWM control module 340 to perform output regulation;
the anode of the diode D1 is connected with the current amplifier 371, and the cathode of the diode D1 is connected with the current-sharing bus; when the current-sharing comparison voltage V outputted by the current amplifier 371 IGreater than the current-sharing bus voltage V on the current-sharing bus SBWhen the diode D1 is conducted, the current equalizing bus voltage V on the current equalizing bus SBIs converted into a current-sharing comparison voltage V IThe voltage value of (2).
When the current-sharing comparison voltage V outputted by the current amplifier 371 I<Bus voltage V of current sharing SBWhen the diode D1 is turned off, the output of the switching power supply module is small and should be increased. Illustratively, the current share error amplifier 372 outputs a positive current share error voltage V CSAfter being overlapped by the reference voltage regulator 373, the current-sharing control voltage V rcGreater than a reference voltage V refThe voltage error amplifier 374 may control the PWM control module 340 to increase the power output.
On the contrary, when the current-sharing comparison voltage V outputted from the current amplifier 371 I>Bus voltage V of current sharing SBWhen the diode D1 is turned on, the output of the switching power supply module is the largest and does not need to be adjusted compared with other switching power supply modules. At this time, the diode D2 is turned on, and the bus voltage V is equalized SBThe voltage value is increased to the current-sharing comparison voltage V of the switch power supply module IAnd other switching power supply modules increase output and approach the switching power supply module.
Therefore, by utilizing the unidirectional conductivity of the diode D1, the voltage on the current-sharing bus is always maintained to be the maximum value of the current-sharing comparison voltage in all the switch power supply modules, namely, other switch power supply modules are close to the maximum current according to the maximum current as the standard, and automatic current sharing is realized.
It can be understood that the current sharing circuit can be constructed by using conventional components, and an IC chip with corresponding functions can also be used. For example, the current sharing module 370 may use current sharing chips, such as UC3902 chips, UC3907 chips of TI, and other common current sharing chips.
The invention further provides an LED display screen, which comprises a plurality of LED display units and at least one power supply, wherein the LED display units are spliced to form the LED display screen, the power supply is electrically connected with the LED display units, and the power supply supplies power to the LED display units. The power supply is a high efficiency switching power supply circuit as in any of the previous embodiments.
In some embodiments, there may be more than one power supply. Meanwhile, the LED display units can be divided into a plurality of groups, and each group of LED display units can share one power supply.
In some embodiments, each LED display unit may use one power supply alone, with the same number of power supplies as the number of LED display units.
The LED display screen provided by the embodiment of the invention is provided with the high-efficiency switch power supply circuit, a plurality of switch power supply modules are connected in parallel, and a switch is arranged on a path of each switch power supply module; the power management module can acquire the electric energy output data of the switching power supply module to judge the power change required by the load, and then according to the power required by the load, the power management module controls the on and off of the switch to open or close the corresponding switching power supply module, so that the power requirement of the load is met, the power efficiency is maintained at a higher level, the energy consumption of the switching power supply is reduced, and the energy-saving effect can be effectively guaranteed. Meanwhile, a plurality of switching power supply modules are combined in a parallel connection mode, the current and the voltage borne by each switching power supply module are in a lower level, requirements on devices are relatively low, and the cost of the whole power supply can be effectively reduced.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (10)

1. A high-efficiency switch power supply circuit is characterized by comprising a switch module, a power supply management module, at least two switch power supply modules, a power supply input end and a power supply output end;
the switching power supply modules are mutually connected in parallel and connected to the power supply output end, and the switching power supply modules are directly or indirectly connected with the power supply input end;
the switch module comprises a plurality of switches connected in parallel, and at least one switch power supply module is connected with the power supply input end through the switch;
the power supply management module is connected with at least one switch power supply module to acquire electric energy output data of the switch power supply module; the power management module is connected with the switch module, and controls the switch in the switch module to be turned on or off according to the acquired electric energy output data so as to turn on or turn off the switch power supply module connected with the switch.
2. The high efficiency switching power supply circuit of claim 1 wherein each of said switching power supply modules is connected to said power supply input through one of said switches.
3. The high efficiency switching power supply circuit of claim 1 wherein at least one of said switching power supply modules is connected to said power supply input through one of said switches; at least one of the switching power supply modules is directly connected to the power supply input terminal.
4. The high efficiency switching power supply circuit according to claim 1, wherein the switching power supply module comprises: an input end, an output end, an input side rectifying and filtering module, a power conversion module, an output side rectifying and filtering module, an output sampling module and a PWM control module,
the input side rectifying and filtering module is connected with the input end and is used for rectifying and filtering alternating current input to obtain direct current voltage;
the power conversion module is connected with the input side rectification filter module and is used for converting the direct-current voltage into low-voltage pulse voltage;
the output side rectifying and filtering module is connected with the power conversion module, and is used for rectifying and filtering the low-voltage pulse voltage to obtain an output voltage which is connected with the output end for output;
the output sampling module is used for sampling the output voltage to obtain a sampling signal;
the PWM control module is connected with the output sampling module and the power conversion module, and controls the working state of the power conversion module according to the sampling signal to adjust the output voltage of the output side rectification filter module.
5. The high-efficiency switching power supply circuit according to claim 4, wherein the switching power supply module further comprises a PFC module, and the PFC module is connected with the input side rectifying and filtering module and the power conversion module and is used for correcting the phase of the voltage and the current of the AC input.
6. The high-efficiency switching power supply circuit according to claim 4, wherein the switching power supply module further comprises a current-sharing module connected to the output sampling module and the PWM control module, the current-sharing module is connected to current-sharing modules of other switching power supply modules through a current-sharing bus, and the current-sharing module obtains a current-sharing bus voltage on the current-sharing bus; the current-sharing module acquires the sampling signal from the output sampling module, compares the sampling signal with the current-sharing bus voltage, and regulates the output voltage by controlling the PWM control module.
7. The high-efficiency switch power supply circuit according to claim 6, wherein the current-sharing module is one of a regulated output impedance circuit, a master-slave setting circuit, an average current automatic current-sharing circuit, and a maximum current automatic current-sharing circuit.
8. The high-efficiency switch power supply circuit according to claim 6, wherein the current-sharing module is a maximum current automatic current-sharing circuit, and comprises a current amplifier, a current-sharing error amplifier, a reference voltage regulator, a voltage error amplifier and a diode,
the current amplifier is connected with the output sampling module to obtain sampling current, and the sampling current is processed to obtain current-sharing comparison voltage which is output to the current-sharing error amplifier;
the current-sharing error amplifier respectively acquires the current-sharing comparison voltage from the current amplifier and acquires the current-sharing bus voltage from a current-sharing bus, and the current-sharing error voltage is obtained through comparison processing;
the reference voltage regulator is connected with the current-sharing error amplifier and the voltage error amplifier, and acquires the current-sharing error voltage and a reference voltage, and the current-sharing error voltage and the reference voltage are superposed to obtain a current-sharing control voltage;
the voltage error amplifier is connected with the output sampling module and the reference voltage regulator, respectively obtains sampling voltage from the output sampling module and the current-sharing control voltage from the reference voltage regulator, and outputs a current-sharing control signal after comparison processing to control the PWM control module to carry out output regulation;
the anode of the diode is connected with the current amplifier, and the cathode of the diode is connected with a current equalizing bus; when the current-sharing comparison voltage output by the current amplifier is larger than the current-sharing bus voltage on the current-sharing bus, the diode is conducted.
9. The high-efficiency switching power supply circuit according to claim 4, wherein the switching power supply module further comprises an output side protection circuit, connected to the output terminal and the PWM control module, for detecting the output of the output terminal, and controlling the PWM control module to turn off the power conversion module when it is determined that there is an abnormality in the output of the output terminal.
10. An LED display screen, includes a plurality of LED display element, at least one power, LED display element concatenation forms the LED display screen, the power with LED display element electricity is connected, the power is for the LED display element power supply, characterized in that, the power is the high efficiency switching power supply circuit of any one of claim 1-9.
CN201911056516.7A 2019-10-31 2019-10-31 High-efficiency switching power supply circuit and LED display screen Pending CN110784095A (en)

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Application publication date: 20200211