CN117524088A - LED display screen for high-efficiency energy management - Google Patents
LED display screen for high-efficiency energy management Download PDFInfo
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- CN117524088A CN117524088A CN202311604231.9A CN202311604231A CN117524088A CN 117524088 A CN117524088 A CN 117524088A CN 202311604231 A CN202311604231 A CN 202311604231A CN 117524088 A CN117524088 A CN 117524088A
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- circuit
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- led display
- crossing detection
- transformer
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- 238000001514 detection method Methods 0.000 claims description 49
- 238000002955 isolation Methods 0.000 claims description 8
- 238000005070 sampling Methods 0.000 claims description 8
- 230000002238 attenuated effect Effects 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 238000004146 energy storage Methods 0.000 abstract description 8
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 230000000087 stabilizing effect Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 239000003381 stabilizer Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/32—Pulse-control circuits
- H05B45/325—Pulse-width modulation [PWM]
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The invention relates to an LED display screen with high-efficiency energy management, which comprises an alternating current output end, an MOS tube circuit and an MOS tube control end, wherein the alternating current output end is electrically connected with a primary side circuit of a transformer through the MOS tube circuit; the power supply of the main control circuit is separated from the backlight drive of the LED display screen in power supply, the power supply of the main control circuit has low power supply requirement and does not have too much extra consumption, so that current works only when PWM outputs high potential, the primary side circuit of the transformer does not have output, otherwise, the primary side circuit of the transformer does not have output, a plurality of capacitive loads, electronic switches, resistors and other devices in the original configuration circuit cannot continuously work, capacitive load energy storage can be released in time, capacitive load energy storage can be utilized, and electromagnetic interference can be reduced as well as energy consumption.
Description
Technical Field
The invention belongs to the field of LED display screen control, and particularly relates to an LED display screen with high-efficiency energy management.
Background
In the process of supplying power to the backlight of the Led display screen, a direct-current power supply is generally connected to an MOS tube, and then one path of PWM control is used for controlling and outputting the power supply. In the application of the technology, a direct-current power supply is also subjected to alternating-current conversion, a power supply circuit at the front end of the MOS tube is very complex (comprising a plurality of devices such as capacitive loads, electronic switches and resistors), and the devices consuming electric energy are very many and the capacitive loads are very many; however, the display screen only has current operation when the PWM outputs high potential, that is, the backlight of the display screen consumes little power, but the power consumption of the power supply circuit and the configuration circuit of the power supply circuit is much, and the power consumption is continuous, because the power supply circuit at the front end of the MOS tube also consumes power when the PWM outputs non-high potential. The reason why the power supply circuit is required to supply power continuously in the prior art is that the prior art has a defect in its design, and a part of the power is required to supply power to the control system continuously, because the control system needs to supply power continuously, but the design wastes much power.
Disclosure of Invention
The present invention is directed to an LED display screen with high efficiency energy management, so as to solve the problems set forth in the background art.
In order to solve the technical problems, the invention provides the following technical scheme:
the LED display screen for high-efficiency energy management comprises an alternating current output end, an MOS tube circuit and an MOS tube control end, wherein the alternating current output end is electrically connected with a primary side circuit of a transformer through the MOS tube circuit; the primary side circuit of the transformer is arranged close to the secondary side circuit of the transformer, the secondary side circuit of the transformer is also electrically connected with the secondary side filter circuit and the rectifying circuit in sequence, and the secondary side circuit of the transformer is also electrically connected with the secondary side configuration circuit; the output end of the rectifying circuit is used for supplying power to the backlight of the Led display screen, and the MOS tube control end is used for loading PWM control signals to the MOS tube circuit to realize the backlight driving of the Led display screen; the alternating current output end is also electrically connected with one path of alternating current-direct current conversion circuit and is used for supplying power to the LED display screen main control circuit.
Furthermore, the alternating current output end is electrically connected with the zero-crossing detection circuit, and the MOS tube control end is electrically connected with the zero-crossing detection circuit and used for sampling the polarity of alternating current and judging zero so as to realize zero-crossing on and off of the circuit of the MOS tube control end.
Further, the zero-crossing detection circuit comprises a zero-crossing detection circuit formed by a comparator or a triode and the like, and the zero-crossing detection circuit can change the output state of the comparator or the conduction state of the triode when the alternating current input exceeds zero reference voltage by attenuating the alternating current signal and inputting the attenuated alternating current signal into the base electrode of the comparator or the triode, so that the zero-crossing detection of the alternating current is realized.
Further, the zero-crossing detection circuit comprises a zero-crossing detection circuit adopting optocoupler isolation, and the output state is changed by carrying out zero-crossing detection by utilizing the diode conduction and optocoupler isolation characteristics.
Further, the zero-crossing detection circuit comprises a zero-crossing detection circuit acquired by an ADC, an alternating current signal is attenuated to an ADC input end through a voltage dividing resistor, and the ADC is used for voltage sampling to detect a zero-crossing point.
Further, the primary side configuration circuit comprises a fuse or a breaker to prevent the transformer from being damaged due to excessive current; the temperature sensor also comprises a temperature detection circuit and an indication circuit.
Further, the secondary side configuration circuit includes a voltage stabilizing circuit that can stabilize the output voltage within a certain range.
Further, the secondary side configuration circuit includes a protection circuit to protect the circuit from overvoltage, overcurrent, and the like.
The beneficial effects are that: according to the method, the power supply of the main control circuit is separated from the backlight drive of the LED display screen in power supply, the power supply of the main control circuit has low power supply requirement and the circuits do not have too much extra consumption, PWM control signals are loaded on one side of the primary side circuit of the transformer in the backlight drive of the LED display screen, so that current works only when PWM outputs high potential, the primary side circuit of the transformer outputs, otherwise, the primary side circuit of the transformer does not output, a plurality of capacitive loads, electronic switches, resistors and other devices in the original configuration circuit cannot continuously work, capacitive load energy storage can be timely released, capacitive load energy storage can be utilized, and not only energy consumption but also electromagnetic interference can be reduced.
Drawings
Fig. 1 is a schematic circuit diagram of an LED display screen for high-efficiency energy management according to the present application.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The application discloses an LED display screen with high-efficiency energy management, as shown in figure 1, comprising an alternating current output end, an MOS tube circuit and an MOS tube control end, wherein the alternating current output end is electrically connected with a primary side circuit of a transformer through the MOS tube circuit; the primary side circuit of the transformer is arranged close to the secondary side circuit of the transformer, the secondary side circuit of the transformer is also electrically connected with the secondary side filter circuit and the rectifying circuit in sequence, and the secondary side circuit of the transformer is also electrically connected with the secondary side configuration circuit; the output end of the rectifying circuit is used for supplying power to the backlight of the Led display screen, and the MOS tube control end is used for loading PWM control signals to the MOS tube circuit to realize the backlight driving of the Led display screen; the alternating current output end is also electrically connected with one path of alternating current-direct current conversion circuit and is used for supplying power to the LED display screen main control circuit; in the method, in the power supply, the power supply of a main control circuit is separated from the backlight drive of the LED display screen, the power supply of the main control circuit has low power supply requirement and the circuits do not have too much extra consumption, in the backlight drive of the LED display screen, PWM control signals are loaded on one side of a primary side circuit of a transformer, so that only when PWM outputs high potential, current works, the primary side circuit of the transformer outputs, otherwise, the primary side circuit of the transformer does not output, a plurality of capacitive loads, electronic switches, resistors and other devices in the original configuration circuit do not work continuously, capacitive load energy storage can be released in time, capacitive load energy storage can be utilized, and not only energy consumption but also electromagnetic interference can be reduced; the alternating current output end is also electrically connected with the zero-crossing detection circuit, and the MOS tube control end is also electrically connected with the zero-crossing detection circuit and is used for sampling the polarity of alternating current and judging zero so as to realize zero-crossing on and off of the circuit of the MOS tube control end. For example, the zero-crossing detection circuit comprises a zero-crossing detection circuit formed by a comparator or a triode and the like, and the zero-crossing detection circuit can change the output state of the comparator or the conduction state of the triode when the alternating current input exceeds zero reference voltage by attenuating the alternating current signal and inputting the attenuated alternating current signal to the base electrode of the comparator or the triode, so that the zero-crossing detection of the alternating current is realized. For example, the zero-crossing detection circuit comprises a zero-crossing detection circuit adopting optocoupler isolation, and the output state is changed by performing zero-crossing detection by utilizing the diode conduction and optocoupler isolation characteristics, for example, the zero-crossing detection circuit comprises a zero-crossing detection circuit adopting ADC (analog to digital converter) acquisition, and the zero-crossing detection circuit attenuates an alternating current signal to an ADC input end through a voltage dividing resistor and performs voltage sampling through the ADC.
The polarity of the alternating current is sampled, the zero crossing is realized, and the switching on and off can be realized through the following steps:
1. the polarity of the alternating current is sampled: the polarity of the alternating current generally refers to the direction of the current. In half a cycle of alternating current, the direction of current is from negative to positive, called positive polarity; from positive to negative, called negative polarity. When current passes through the sensor, a weak magnetic field is generated, which is sensed by the sensor and a voltage signal is output. By analyzing the positive and negative of the voltage signal, the direction of the current can be judged, so that the polarity of the alternating current is sampled.
2. Judging zero point: during the period of alternating current, the current and voltage vary between positive and negative polarities. The zero point is the point where the current and voltage are zero, usually at the center of the cycle of the alternating current. When the voltage reaches zero, the output signal of the sensor will be zero. By detecting the zero point of this signal, the zero point position of the alternating current can be judged.
3. Zero crossing on and off: when controlling the on-off of alternating current, it is generally necessary to perform on-off operation when the current and voltage are zero, so as to avoid impact on the circuit. In order to realize zero crossing on and off, the control end of the MOS tube can be used for matching with the zero position of alternating current, and on or off operation is carried out at the zero position. The primary side configuration circuit comprises a protection circuit, such as a fuse or a circuit breaker, to prevent the transformer from being damaged due to excessive current; the temperature detecting circuit and the indicating circuit are also included; the secondary side configuration circuit comprises a voltage stabilizing circuit: the voltage stabilizing circuit can stabilize the output voltage in a certain range, and the common voltage stabilizing circuit comprises a linear voltage stabilizer and a switching voltage stabilizer. The secondary side configuration circuit includes a protection circuit to protect the circuit from overvoltage, overcurrent, etc.; including fuses, thermistors, and the like.
In addition, in the LED display screen, the PWM control signal itself is relatively common, and the types of PWM control chips that are commonly used are various, and the following listed common types:
tlc5940: TLC5940 is a 16-channel gray PWM control chip, and can be widely applied to the fields of LED illumination, display screens, color lamps and the like. The device has high-precision PWM output and 16-bit gray scale control, and can realize flexible brightness adjustment. In addition, TLC5940 also has serial data input and cascade output functions, facilitating coordinated control with other chips.
Max16834: MAX16834 is a high brightness LED driver with an integrated PWM controller. It employs a high efficiency boost topology of a single inductor, which can provide up to 97% conversion efficiency. MAX16834 also has multiple protection functions, such as short-circuit protection, over-temperature protection, under-voltage protection, etc., can ensure the safe operation of LED.
NE555: NE555 is a classical timer and Pulse Width Modulation (PWM) control chip. The method has the characteristics of simplicity, easiness in use, stability and the like, and can be widely applied to various electronic equipment. The NE555 chip realizes PWM control by changing the voltage, and the duty ratio (ratio of high level time to period) of its output signal can be controlled by adjusting the resistance and capacitance on the chip.
Since the PWM control signal is implemented by controlling the pulse signal, it is possible to avoid the problem of overcurrent or overvoltage, which may be caused by directly using the direct current. The control mode can be conveniently integrated with advanced control systems such as a Digital Signal Processor (DSP) and the like, and more accurate backlight brightness control is realized. In combination with the present application, because the capacitive load energy storage can be released in time, the capacitive load energy storage can also be utilized, so that effective signals in the PWM control signals can be reduced in practice, and energy saving can be realized by changing the PWM control signals from the point of view.
Embodiments of the present application that require protection include:
the LED display screen for high-efficiency energy management comprises an alternating current output end, an MOS tube circuit and an MOS tube control end, wherein the alternating current output end is electrically connected with a primary side circuit of a transformer through the MOS tube circuit; the primary side circuit of the transformer is arranged close to the secondary side circuit of the transformer, the secondary side circuit of the transformer is also electrically connected with the secondary side filter circuit and the rectifying circuit in sequence, and the secondary side circuit of the transformer is also electrically connected with the secondary side configuration circuit; the output end of the rectifying circuit is used for supplying power to the backlight of the Led display screen, and the MOS tube control end is used for loading PWM control signals to the MOS tube circuit to realize the backlight driving of the Led display screen; the alternating current output end is also electrically connected with one path of alternating current-direct current conversion circuit and is used for supplying power to the LED display screen main control circuit.
Preferably, the alternating current output end is also electrically connected with the zero-crossing detection circuit, and the MOS tube control end is also electrically connected with the zero-crossing detection circuit and used for sampling the polarity of alternating current and judging zero so as to realize zero-crossing on and off of the circuit of the MOS tube control end.
Preferably, the zero-crossing detection circuit comprises a zero-crossing detection circuit formed by a comparator or a triode and the like, and the zero-crossing detection circuit can change the output state of the comparator or the conduction state of the triode when the alternating current input exceeds a zero reference voltage by attenuating the alternating current signal and inputting the attenuated alternating current signal to the base electrode of the comparator or the triode, so that the zero-crossing detection of the alternating current is realized.
Preferably, the zero-crossing detection circuit comprises a zero-crossing detection circuit employing optocoupler isolation, and the output state is changed by zero-crossing detection using diode conduction and optocoupler isolation characteristics.
Preferably, the zero-crossing detection circuit comprises a zero-crossing detection circuit acquired by an ADC, wherein an alternating current signal is attenuated to an ADC input end through a voltage dividing resistor, and the zero-crossing point is detected through voltage sampling of the ADC.
Preferably, the primary side configuration circuit includes a fuse or a circuit breaker to prevent excessive current from damaging the transformer; the temperature sensor also comprises a temperature detection circuit and an indication circuit.
Preferably, the secondary side configuration circuit includes a voltage stabilizing circuit that can stabilize the output voltage within a certain range.
Preferably, the secondary side configuration circuit includes a protection circuit to protect the circuit from over-voltage, over-current, etc.
It will be appreciated by those skilled in the art that the present invention can be carried out in other embodiments without departing from the spirit or essential characteristics thereof. The above disclosed embodiments are illustrative in all respects only and not all changes that come within the scope of the invention or are equivalent to the invention are intended to be embraced therein.
Claims (8)
1. The LED display screen for high-efficiency energy management is characterized by comprising an alternating current output end, an MOS tube circuit and an MOS tube control end, wherein the alternating current output end is electrically connected with a primary side circuit of a transformer through the MOS tube circuit; the primary side circuit of the transformer is arranged close to the secondary side circuit of the transformer, the secondary side circuit of the transformer is also electrically connected with the secondary side filter circuit and the rectifying circuit in sequence, and the secondary side circuit of the transformer is also electrically connected with the secondary side configuration circuit; the output end of the rectifying circuit is used for supplying power to the backlight of the Led display screen, and the MOS tube control end is used for loading PWM control signals to the MOS tube circuit to realize the backlight driving of the Led display screen; the alternating current output end is also electrically connected with one path of alternating current-direct current conversion circuit and is used for supplying power to the LED display screen main control circuit.
2. The LED display screen of claim 1, wherein the ac power output terminal is further electrically connected to a zero-crossing detection circuit, and the MOS transistor control terminal is further electrically connected to the zero-crossing detection circuit, for sampling the polarity of the ac power, determining the zero point, and implementing the zero-crossing on and off of the MOS transistor control terminal.
3. The LED display of claim 2, wherein the zero-crossing detection circuit comprises a zero-crossing detection circuit comprising a comparator or a triode, wherein the zero-crossing detection circuit attenuates the ac signal and inputs the attenuated ac signal to the base of the comparator or the triode, and when the ac input exceeds a zero reference voltage, the zero-crossing detection circuit changes the output state of the comparator or the on state of the triode, thereby realizing zero-crossing detection of the ac.
4. The LED display of claim 2, wherein the zero crossing detection circuit comprises a zero crossing detection circuit employing optocoupler isolation, the zero crossing detection being performed using diode turn-on and optocoupler isolation characteristics to change the output state.
5. The LED display of claim 2, wherein the zero crossing detection circuit comprises a zero crossing detection circuit using ADC acquisition, wherein the zero crossing is detected by attenuating the ac signal to the ADC input via a divider resistor and performing voltage sampling via the ADC.
6. The LED display of claim 1, wherein the primary side configuration circuit comprises a fuse or a circuit breaker to prevent excessive current from damaging the transformer; the temperature sensor also comprises a temperature detection circuit and an indication circuit.
7. The LED display of claim 1, wherein the secondary side configuration circuit comprises a voltage regulator circuit that stabilizes the output voltage within a certain range.
8. The LED display of claim 1, wherein the secondary side configuration circuit includes protection circuitry to protect the circuit from over-voltage, over-current, etc.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311604231.9A CN117524088A (en) | 2023-11-28 | 2023-11-28 | LED display screen for high-efficiency energy management |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311604231.9A CN117524088A (en) | 2023-11-28 | 2023-11-28 | LED display screen for high-efficiency energy management |
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| Publication Number | Publication Date |
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| CN117524088A true CN117524088A (en) | 2024-02-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202311604231.9A Pending CN117524088A (en) | 2023-11-28 | 2023-11-28 | LED display screen for high-efficiency energy management |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0799775A (en) * | 1993-09-27 | 1995-04-11 | Canon Inc | Power source unit |
| JP2001320882A (en) * | 2000-05-09 | 2001-11-16 | Matsushita Electric Ind Co Ltd | Power supply apparatus, inverter and air conditioner |
| JP2011014945A (en) * | 2010-10-22 | 2011-01-20 | Texas Instr Japan Ltd | Led drive voltage supply circuit, and led device |
| CN103151000A (en) * | 2013-03-29 | 2013-06-12 | 深圳市华星光电技术有限公司 | Backlight driving circuit and driving method thereof and liquid crystal display device |
| CN105322803A (en) * | 2015-11-02 | 2016-02-10 | 深圳创维－Rgb电子有限公司 | Constant-voltage and constant-current synchronous output power supply and television |
| CN107636923A (en) * | 2017-06-08 | 2018-01-26 | 刘远芳 | Suppress the control system and device and its application process of surge current |
-
2023
- 2023-11-28 CN CN202311604231.9A patent/CN117524088A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0799775A (en) * | 1993-09-27 | 1995-04-11 | Canon Inc | Power source unit |
| JP2001320882A (en) * | 2000-05-09 | 2001-11-16 | Matsushita Electric Ind Co Ltd | Power supply apparatus, inverter and air conditioner |
| JP2011014945A (en) * | 2010-10-22 | 2011-01-20 | Texas Instr Japan Ltd | Led drive voltage supply circuit, and led device |
| CN103151000A (en) * | 2013-03-29 | 2013-06-12 | 深圳市华星光电技术有限公司 | Backlight driving circuit and driving method thereof and liquid crystal display device |
| CN105322803A (en) * | 2015-11-02 | 2016-02-10 | 深圳创维－Rgb电子有限公司 | Constant-voltage and constant-current synchronous output power supply and television |
| CN107636923A (en) * | 2017-06-08 | 2018-01-26 | 刘远芳 | Suppress the control system and device and its application process of surge current |
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