CN111431270A - L ED display screen switching power supply with double power supply switching - Google Patents
L ED display screen switching power supply with double power supply switching Download PDFInfo
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- CN111431270A CN111431270A CN202010339101.7A CN202010339101A CN111431270A CN 111431270 A CN111431270 A CN 111431270A CN 202010339101 A CN202010339101 A CN 202010339101A CN 111431270 A CN111431270 A CN 111431270A
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- power supply
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- electric connection
- power
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Classifications
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- 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
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
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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
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/24—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to undervoltage or no-voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/005—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection avoiding undesired transient conditions
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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
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/02—Details of power systems and of start or stop of display operation
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- Engineering & Computer Science (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Dc-Dc Converters (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The invention discloses a L ED display screen switch power supply with double power supply switching, which comprises a first power supply and a second power supply, wherein the first power supply and the second power supply are electrically connected with a bidirectional control switch, the bidirectional control switch is electrically connected with a threshold comparison circuit, the threshold comparison circuit is electrically connected with an anti-surge circuit, the anti-surge circuit is electrically connected with an under-voltage turn-off circuit, the under-voltage turn-off circuit is electrically connected with a control module, the control module is electrically connected with a detection module, the detection module is electrically connected with the under-voltage turn-off circuit, the control module is electrically connected with a driver, and the driver is electrically connected with a negative feedback control module.
Description
Technical Field
The invention belongs to the technical field of L ED display screens, and particularly relates to a L ED display screen switching power supply with double power supply switching.
Background
L ED display screen is a flat panel display, which is composed of L ED module panels, used to display various information such as text, image, video, etc., and when L ED display screen is used, it also needs to use the switch power supply to control and regulate L ED display screen, however, there are various problems in the switch power supply of L ED display screen on the market.
Although the switch power supply device and the control method of the switch power supply disclosed in the publication No. CN201010127033.4 achieve discontinuous power supply to the power circuit unit according to the load condition, and reduce the damage of the power supply under the light load condition or no load condition, the problems that the supply mode of the power supply cannot be selected, the stable power supply to the power supply cannot be achieved, the fluctuation of the power supply is easily caused, and the stability of the power supply is detected and fed back in the conventional power supply of the L ED display screen are not solved, and therefore, a dual-power-supply switching L ED display screen switch power supply is proposed.
Disclosure of Invention
The invention aims to provide a double-power-supply switching power supply for L ED display screens, which solves the problems in the prior art.
In order to achieve the purpose, the invention provides the following technical scheme: including first power and second power, the output electric connection of first power and second power has the two-way control switch, the one end electric connection of two-way control switch has threshold comparison circuit, the one end electric connection of threshold comparison circuit has anti-surge circuit, anti-surge circuit's one end electric connection has undervoltage turn-off circuit, undervoltage turn-off circuit's one end electric connection has control module, the last electric connection of control module has detection module, detection module and undervoltage turn-off circuit electric connection, control module electric connection has the driver, electric connection has load equipment on the driver, electric connection has negative feedback control module on the driver, negative feedback control module electric connection is on control module.
Preferably, the threshold comparison circuit is configured to compare stability of the first power supply and the second power supply, and the threshold comparison circuit compares the first power supply and the second power supply through a nand logical relationship, and selects a power supply mode of the first power supply and the second power supply through the bidirectional control switch.
Preferably, the anti-surge circuit is used for the first power supply or the second power supply to cause damage to the control module and other circuits due to overlarge voltage surge when power is supplied.
Preferably, the under-voltage turn-off circuit is electrically connected with an auxiliary power supply, and the auxiliary power supply is used for performing auxiliary power supply when the power supply voltage of the first power supply or the second power supply is too low.
Preferably, including voltage detection circuit, current detection circuit, oscillation detection circuit and temperature detection module in the detection module, voltage detection circuit is used for detecting the size of voltage, and current detection circuit is used for detecting the overload of electric current to and oscillation detection circuit is with the stability of detection circuit current-voltage, prevent that circuit current-voltage from fluctuating too greatly, and temperature detection module is used for the temperature of detection circuit when operation.
Preferably, the undervoltage shutdown circuit is electrically connected with the detection module and used for shutting down the circuit when the detection module detects that the circuit is abnormal, so that the circuit voltage is prevented from damaging equipment.
Preferably, the negative feedback control module is used for detecting the voltage and the current in the subsequent circuit and feeding back the detection result to the control module.
Preferably, the driver is used for driving the load device, and the driver includes a voltage regulation module therein, and the voltage regulation module is used for regulating the voltage to be within a stable voltage range of the operation of the load device.
Compared with the prior art, the invention has the beneficial effects that:
(1) the power supply circuit is provided with the threshold comparison circuit which can select the first power supply or the second power supply and select relatively stable voltage for power supply, and the anti-surge circuit which can prevent the control module from being damaged under the action of surge due to overlarge voltage at the moment of power supply of the first power supply or the second power supply.
(2) The invention is provided with the detection module which is electrically connected with the undervoltage turn-off circuit, so that the circuit can be directly cut off when the instability of the circuit is detected, the damage of the instability of the circuit to the display of an L ED display screen is prevented, and the invention is provided with the negative feedback control circuit which can detect and feed back the condition of the circuit.
(3) The L ED display screen is provided with the first power supply and the second power supply which are used for supplying power to the L ED display screen respectively, and the auxiliary power supply is arranged for supplying power in an auxiliary mode when the voltage of the first power supply or the second power supply is too low, so that the stability of the voltage is kept.
Drawings
FIG. 1 is a schematic diagram of a circuit system according to the present invention;
FIG. 2 is a schematic diagram of a detection module according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-2, the invention provides a L ED display screen switch power supply technical scheme with double power supply switching, which comprises a first power supply and a second power supply, wherein the output ends of the first power supply and the second power supply are electrically connected with a two-way control switch, the first power supply and the second power supply at the position can realize power supply selection through a threshold comparison circuit, one end of the two-way control switch is electrically connected with a threshold comparison circuit, one end of the threshold comparison circuit is electrically connected with an anti-surge circuit, the anti-surge circuit at the position can prevent the first power supply or the second power supply from damaging a control module due to overlarge power supply instant voltage, one end of the anti-surge circuit is electrically connected with an under-voltage turn-off circuit, the under-voltage turn-off circuit at the position can turn off the circuit when the detection module detects that the circuit is unstable, so as to prevent the unstable voltage from damaging equipment, one end of the under-voltage turn-off circuit is electrically connected with a control module, the control module at the position is used for controlling a system, the detection module is electrically connected with an under-voltage detection module, the detection module is used for detecting that the circuit is used for detecting the voltage, the temperature, the driver is used for controlling the equipment, and the driver is connected with a high-load control module for controlling the auxiliary driver, and the auxiliary driver for controlling the high-load when the detection module for detecting that is connected with the high-load.
In order to achieve stability of power supply and enable selective power supply according to the stability of the power supply, in this embodiment, it is preferable that the threshold comparison circuit is configured to compare the stability of the first power supply and the stability of the second power supply, compare the first power supply and the second power supply through an nand logical relationship, and select a power supply mode of the first power supply and the second power supply through the bidirectional control switch.
In order to prevent the power supply of the first power supply or the second power supply from generating a large voltage surge instantaneously when the device is running, and prevent the surge voltage from damaging the control module, in this embodiment, it is preferable that the surge preventing circuit is used for preventing the voltage surge when the first power supply or the second power supply supplies power from being too large, and damaging the control module and other circuits.
In order to prevent the first power supply and the second power supply from generating too low voltage when supplying power and damaging the L ED display screen, an auxiliary power supply is provided to supplement the voltage of the first power supply and the second power supply.
In order to detect the circuit, the voltage instability of the circuit and the overload of the current are prevented when the circuit operates, and the waveform of the voltage may oscillate when the circuit operates, which may affect the stability of the system to a certain extent, and the temperature of the circuit is too high, which may cause a large amount of damage and instability of the system.
In order to cut off the circuit when the circuit is unstable or the circuit has a defect, and not continuously supply power, so as to ensure the safety of the circuit, in this embodiment, preferably, the under-voltage turn-off circuit is electrically connected with the detection module and is used for turning off the circuit when the detection module detects that the circuit is abnormal, so as to prevent the circuit voltage from damaging the equipment.
In order to detect the voltage and current conditions in the subsequent circuit, so that the operation of the circuit can be stable and is convenient to control, in this embodiment, preferably, the negative feedback control module is configured to detect the voltage and current conditions in the subsequent circuit and feed back the detection result to the control module.
In order to stably drive the L ED display screen, in this embodiment, it is preferable that the driver is used for driving the load device, and the driver includes a voltage regulation module for regulating the voltage to be within a stable voltage range for the operation of the load device.
The working principle and the using process of the invention are as follows: when the load equipment is started, the threshold comparison circuit selects the first power supply and the second power supply through the NAND relation, so that the power supply selection of the first power supply or the second power supply is realized, the surge-proof circuit blocks the impulse voltage of the circuit when the power supply is performed, the control module is prevented from being damaged by the impulse voltage, the auxiliary power supply can perform auxiliary power supply when the voltage of the first power supply or the second power supply is lower when the first power supply or the second power supply is performed, so that the voltage can be kept stable, the detection module is arranged and can detect the circuit, when the circuit has a problem, the undervoltage turn-off circuit can turn off the circuit and does not perform power supply, then the driver can drive the load equipment to perform power supply, and the negative feedback control module is arranged to detect the use condition of subsequent voltage, and the information is sent to the control module, so that the switching power supply can stably supply power.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. The utility model provides a L ED display screen switching power supply that double power supply switches, includes first power and second power, its characterized in that the output electric connection of first power and second power has the bilateral control switch, the one end electric connection of bilateral control switch has threshold comparison circuit, the one end electric connection of threshold comparison circuit has anti-surge circuit, anti-surge circuit's one end electric connection has the undervoltage turn-off circuit, the one end electric connection of undervoltage turn-off circuit has control module, the last electric connection of control module has detection module, detection module and undervoltage turn-off circuit electric connection, control module electric connection has the driver, electric connection has load equipment on the driver, the electric connection has negative feedback control module on the driver, negative feedback control module electric connection is on control module.
2. The L ED display screen switch power supply with double power supply switching function of claim 1, wherein the threshold comparison circuit is used to compare the stability of the first power supply and the second power supply, and the threshold comparison circuit compares the first power supply with the second power supply through the NAND logic relationship, and selects the power supply mode of the first power supply and the second power supply through the bidirectional control switch.
3. The L ED display screen switching power supply with double power supplies switching function of claim 1, wherein the anti-surge circuit is used for the first power supply or the second power supply to cause damage to the control module and other circuits due to excessive voltage surge when supplying power.
4. The dual-power-supply-switched L ED display screen switch power supply of claim 1, wherein an auxiliary power supply is electrically connected to the undervoltage shutdown circuit, and the auxiliary power supply is used for supplying auxiliary power when the supply voltage of the first power supply or the second power supply is too low.
5. The L ED display screen switching power supply with double power supply switching function of claim 1, wherein the detection module comprises a voltage detection circuit, a current detection circuit, an oscillation detection circuit and a temperature detection module, the voltage detection circuit is used for detecting the voltage, the current detection circuit is used for detecting the overload of the current, the oscillation detection circuit is used for detecting the stability of the current and the voltage of the circuit, and the temperature detection module is used for detecting the temperature of the circuit during operation.
6. The dual-power-supply-switching L ED display screen switching power supply of claim 4, wherein the under-voltage turn-off circuit is electrically connected with the detection module and used for turning off the circuit when the detection module detects that the detection module is abnormal, so that the circuit voltage is prevented from damaging equipment.
7. The dual-power-supply-switched L ED display screen switching power supply as claimed in claim 1, wherein the negative feedback control module is used for detecting voltage and current in a subsequent circuit and feeding back the detection result to the control module.
8. The dual-power switching L ED display screen switch power supply of claim 1, wherein the driver is used to drive a load device and includes a voltage regulation module therein for regulating the voltage to a stable voltage range for the operation of the load device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010339101.7A CN111431270A (en) | 2020-04-26 | 2020-04-26 | L ED display screen switching power supply with double power supply switching |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010339101.7A CN111431270A (en) | 2020-04-26 | 2020-04-26 | L ED display screen switching power supply with double power supply switching |
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| Publication Number | Publication Date |
|---|---|
| CN111431270A true CN111431270A (en) | 2020-07-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010339101.7A Pending CN111431270A (en) | 2020-04-26 | 2020-04-26 | L ED display screen switching power supply with double power supply switching |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114245523A (en) * | 2021-12-27 | 2022-03-25 | 江苏友润微电子有限公司 | Constant current driving system for LED illumination |
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| US20070091528A1 (en) * | 2004-05-31 | 2007-04-26 | Denso Corporation | Inrush current limiting switching circuit for power supply |
| CN201504117U (en) * | 2009-08-14 | 2010-06-09 | 厦门威尔圣电气实业有限公司 | Intelligent double-power change-over switch |
| CN203325410U (en) * | 2013-05-29 | 2013-12-04 | 晶彩（福建）光电有限公司 | Novel LED display screen |
| CN205726574U (en) * | 2016-06-22 | 2016-11-23 | 赛尔富电子有限公司 | A kind of power circuit being applied to LED |
| CN107546987A (en) * | 2017-08-13 | 2018-01-05 | 余勇 | High frequency switch power |
| CN110635565A (en) * | 2019-10-31 | 2019-12-31 | 广州供电局有限公司 | Dual power supply switching device and dual power supply switching control method |
-
2020
- 2020-04-26 CN CN202010339101.7A patent/CN111431270A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070091528A1 (en) * | 2004-05-31 | 2007-04-26 | Denso Corporation | Inrush current limiting switching circuit for power supply |
| CN201504117U (en) * | 2009-08-14 | 2010-06-09 | 厦门威尔圣电气实业有限公司 | Intelligent double-power change-over switch |
| CN203325410U (en) * | 2013-05-29 | 2013-12-04 | 晶彩（福建）光电有限公司 | Novel LED display screen |
| CN205726574U (en) * | 2016-06-22 | 2016-11-23 | 赛尔富电子有限公司 | A kind of power circuit being applied to LED |
| CN107546987A (en) * | 2017-08-13 | 2018-01-05 | 余勇 | High frequency switch power |
| CN110635565A (en) * | 2019-10-31 | 2019-12-31 | 广州供电局有限公司 | Dual power supply switching device and dual power supply switching control method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114245523A (en) * | 2021-12-27 | 2022-03-25 | 江苏友润微电子有限公司 | Constant current driving system for LED illumination |
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