CN111048055B - Display and display standby power consumption control method - Google Patents
Display and display standby power consumption control method Download PDFInfo
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- CN111048055B CN111048055B CN201911368246.3A CN201911368246A CN111048055B CN 111048055 B CN111048055 B CN 111048055B CN 201911368246 A CN201911368246 A CN 201911368246A CN 111048055 B CN111048055 B CN 111048055B
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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
- G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
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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
- G09G2330/021—Power management, e.g. power saving
- G09G2330/022—Power management, e.g. power saving in absence of operation, e.g. no data being entered during a predetermined time
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Abstract
The invention discloses a display, which comprises a control unit, a video processing unit, an alternating current-direct current conversion unit and a direct current-direct current conversion unit, wherein a first connecting end of the control unit is connected with the video processing unit; the display also comprises a switch unit and an energy storage unit, wherein the input end of the switch unit is used for being connected with an external alternating current power supply, the output end of the switch unit is connected with the input end of the alternating current-direct current conversion unit, the input end of the direct current-direct current conversion unit is connected with the output end of the alternating current-direct current conversion unit, the second connecting end of the control unit is connected with the output end of the direct current-direct current conversion unit, the third connecting end of the control unit is connected with the control end of the switch unit, the fourth connecting end of the control unit is connected with the output end of the alternating current-direct current conversion unit, and the energy storage unit is connected with the output end of the direct current-direct current conversion unit so as to reduce the power consumption of the display in standby.
Description
Technical Field
The present invention relates to the field of electronic power, and in particular, to a display and a method for controlling standby power consumption of the display.
Background
Energy conservation is an important social awareness in the world today, and refers to a series of actions of reducing energy consumption and increasing energy utilization rate as much as possible. The energy conservation definitions proposed in 1979 by the world energy committee are: all measures which are technically feasible, economically reasonable and acceptable to the environment and society are adopted to improve the utilization efficiency of energy resources. The display is operating in standby most of the time. The power supply of the display is not turned off in the standby state, so the display has power consumption in standby. The light load efficiency of the power supply is 40% to 50% when the display is in standby, the overall efficiency is low, the standby power consumption is still excessive, and the power supply is still not ideal in reducing the standby power consumption.
Disclosure of Invention
The embodiment of the invention provides a display and a standby power consumption control method thereof, which are used for reducing the power consumption of the display in standby.
The embodiment of the invention realizes the effects by the following technical means:
The embodiment of the invention provides a display, which comprises a control unit, a video processing unit, an alternating current-direct current conversion unit and a direct current-direct current conversion unit, wherein a first connecting end of the control unit is connected with the video processing unit; the display also comprises a switch unit and an energy storage unit, wherein the input end of the switch unit is used for being connected with an external alternating current power supply, the output end of the switch unit is connected with the input end of the alternating current-direct current conversion unit, the input end of the direct current-direct current conversion unit is connected with the output end of the alternating current-direct current conversion unit, the second connecting end of the control unit is connected with the output end of the direct current-direct current conversion unit, the third connecting end of the control unit is connected with the control end of the switch unit, the fourth connecting end of the control unit is connected with the output end of the alternating current-direct current conversion unit, and the energy storage unit is connected with the output end of the direct current-direct current conversion unit;
When the video processing unit does not detect that a video signal is input or the control unit detects that the voltage of the output end of the alternating current-direct current conversion unit is larger than or equal to a first preset value, the control unit sends out a first control level, the switch unit is disconnected, so that the capacitor of the alternating current-direct current conversion unit supplies power for the direct current-direct current conversion unit, and the energy storage unit supplies power for the control unit;
When the control unit detects that the voltage at the output end of the alternating current-direct current conversion unit is smaller than or equal to a second preset value, the switch unit is turned on when the control unit sends out a second control level, so that the external power supply supplies power to the alternating current-direct current conversion unit, the alternating current-direct current conversion unit supplies power to the direct current-direct current conversion unit, and the direct current-direct current conversion unit charges the energy storage unit and supplies power to the control unit.
Preferably, the display further comprises a sampling unit, an input end of the sampling unit is connected with an output end of the alternating current-direct current conversion unit, and an output end of the sampling unit is connected with a fourth connecting end of the control unit.
Preferably, the switch unit comprises a switch subunit and a switch driving subunit, wherein the input end of the switch subunit is connected with the external alternating current power supply, the output end of the switch subunit is connected with the input end of the alternating current-direct current conversion unit, the input end of the switch driving subunit is connected with the third connecting end of the control unit, and the output end of the switch driving unit is connected with the control end of the switch subunit; wherein the switch driving subunit outputs a third control level when the control unit outputs the first control level, so as to control the switch subunit to be disconnected; the switch driving subunit outputs a fourth control level when the control unit outputs the second control level so as to control the switch subunit to be conducted.
Preferably, the switch drive subunit comprises a drive leg and a first isolation leg; the driving branch circuit comprises a triode, the collector electrode of the triode is connected with a first external power supply, the base electrode of the triode is connected with the third connecting end of the control unit, and the emitter electrode of the triode is grounded; the first isolation branch comprises a first optical coupler, the primary side of the first optical coupler is connected with the collector electrode of the triode, and the secondary side of the first optical coupler is connected with the control end of the switch subunit.
Preferably, the switch subunit includes a second isolation branch and a control branch, an input end of the second isolation branch is connected with an output end of the switch driving subunit, an output end of the second isolation branch is connected with a control end of the control branch, an input end of the control branch is connected with the external ac power supply, and an output end of the control branch is connected with an input end of the ac-dc conversion unit.
Preferably, the second isolation branch comprises a second optical coupler, the control branch comprises a bidirectional thyristor, the positive electrode of the primary side of the second optical coupler is connected with a second external power supply, the negative electrode of the primary side of the second optical coupler is connected with the output end of the switch driving subunit, the positive electrode of the secondary side of the second optical coupler is connected with the second external power supply, the negative electrode of the secondary side of the second optical coupler is connected with the control end of the bidirectional thyristor, the input end of the bidirectional thyristor is connected with the external alternating current power supply, and the output end of the bidirectional thyristor is connected with the input end of the alternating current-direct current conversion unit.
Preferably, the energy storage unit comprises an energy storage capacitor, one end of the energy storage capacitor is connected with the output end of the direct current-direct current conversion unit, and the other end of the energy storage capacitor is grounded.
Preferably, the sampling unit comprises a first resistor and a second resistor which are sequentially connected in series, one end of the first resistor is connected with the output end of the alternating current-direct current conversion unit, one end of the second resistor is grounded, and the connection point of the first resistor and the second resistor forms the output end of the sampling unit.
Preferably, the second external power supply is the external ac power supply, the switch subunit further includes a power supply branch, and the power supply branch includes a diode, a fourth resistor, a fifth resistor, and a capacitor, one end of which is connected to a connection point between the fourth resistor and the fifth resistor, and the anode of the diode is connected to the live wire of the external ac power supply, one end of the fifth resistor is connected to the positive electrode of the second side of the first optocoupler and the positive electrode of the first side of the second optocoupler, the other end of the capacitor is connected to the zero line of the external ac power supply, and the negative electrode of the first side of the second optocoupler is also connected to the zero line of the external ac power supply.
The embodiment of the invention also provides a method for controlling the standby power consumption of the display, which is applied to the display;
The display standby power consumption control method comprises the following steps:
when receiving a video signal input signal without video sent by the video processing unit, sending a first control level to control a switch unit to be disconnected through the first control level, wherein the switch unit is conducted when the display is initially electrified;
when the voltage of the output end of the alternating current-direct current conversion unit is detected to be smaller than or equal to a second preset value, a second control level is sent out, and the switching unit is controlled to be conducted through the second control level;
and when the voltage of the output end of the alternating current-direct current conversion unit is detected to be larger than or equal to a first preset value, the first control level is sent out, so that the switching unit is controlled to be switched off through the first control level.
According to the display and the display standby power consumption control method, the switching time of the alternating current-direct current conversion unit is controlled, so that the alternating current-direct current conversion unit is prevented from being started for a long time, the consumption of the alternating current-direct current conversion unit on electric energy is reduced, and the standby power of the display is further reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments of the present invention will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a display according to an embodiment of the invention;
FIG. 2 is a schematic diagram of a display according to another embodiment of the present invention;
FIG. 3 is a schematic diagram of a display according to another embodiment of the invention
FIG. 4 is a circuit diagram of a display in another embodiment of the invention;
Fig. 5 is a flowchart of a method for controlling standby power consumption of a display according to an embodiment of the invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the invention. 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.
Fig. 1 is a schematic structural diagram of a display according to an embodiment of the present invention, where the display is mainly applied to a display and functions to reduce standby power consumption of the display. As shown in fig. 1, the display includes a video processing unit 10, a control unit 60, an ac-dc conversion unit 40, a dc-dc conversion unit 50, a switching unit 30, and an energy storage unit 70, wherein an input end of the switching unit 30 is connected to an external ac power source 20, an output end of the switching unit 30 is connected to an input end of the ac-dc conversion unit 40, an input end of the dc-dc conversion unit 50 is connected to an output end of the ac-dc conversion unit 40, a first connection end of the control unit 60 is connected to the video processing unit 10, a second connection end of the control unit 60 is connected to an output end of the dc-dc conversion unit 50, a third connection end of the control unit 60 is connected to a control end of the switching unit 30, a fourth connection end of the control unit 60 is connected to an output end of the ac-dc conversion unit 40, and the energy storage unit 70 is connected to an output end of the dc-dc conversion unit 50.
The control unit 60 may include an AD conversion module and a control chip, and these modules may be integrated together or distributed, and the video processing unit may be designed integrally with the control unit, for example, as an integrated circuit, or may be further configured, which is not particularly limited herein. The AD conversion module is mainly configured to detect a voltage at an output end of the ac-dc conversion unit 40; the video processing unit is mainly used for detecting whether a video signal is input or not (judging whether the display enters a standby state or not by detecting whether the video signal is output or not); the control chip is mainly used for controlling (such as sending out a control level according to whether a video signal is input or not, thereby controlling the on and off of the switch unit 30) and judging (such as judging the voltage of the output terminal of the ac-dc conversion unit 40). The ac-dc conversion unit 40 is mainly used for converting ac power (e.g. 220V mains supply) output by the external ac power source 20 into dc power, and it should be noted that some capacitors, such as filter capacitors, are typically included in the ac-dc conversion unit 40. The dc-dc conversion unit 50 is mainly used for reducing the dc power output by the ac-dc conversion unit 40; the switching unit 30 is mainly used for controlling the input of the external ac power source 20; the energy storage unit 70 is used for storing electric energy, and its storage amount is determined by its internal structure.
In the above display, when the control unit 60 detects that the voltage at the output end of the ac-dc conversion unit 40 is less than or equal to the second preset value, the control unit 60 sends out the second control level, the switch unit is turned on, so that the external power source supplies power to the ac-dc conversion unit 40, so that the ac-dc conversion unit 40 supplies power to the dc-dc conversion unit 50, and the dc-dc conversion unit 50 charges the energy storage unit 70 and supplies power to the control unit 60.
When the video processing unit does not detect that a video signal is input, or the control unit 60 detects that the voltage at the output end of the ac-dc conversion unit 40 is greater than or equal to a first preset value, the control unit 60 sends a first control level, the switching unit 30 is turned off, so that the filter capacitor of the ac-dc conversion unit 40 supplies power to the dc-dc conversion unit, and the energy storage unit 70 supplies power to the control unit 60.
Specifically, when the ac power source is initially powered on (i.e., when the external ac power source 20 outputs ac power), the ac-dc conversion unit 40 starts to operate after the switch unit 30 is turned on, and outputs dc power to the dc-dc conversion unit 50, and at this time, the voltages at the output terminal of the ac-dc conversion unit 40 and the dc-dc conversion unit 50 are both normal values.
When the video processing unit 10 detects that no video signal is input (i.e. the display enters a standby state), the control unit 60 issues a first control level, causing the switching unit 30 to be turned off. After the switch unit 30 is turned off, the capacitor on the ac-dc conversion unit 40 is discharged, so that the control unit 60 detects that the voltage on the output terminal of the ac-dc conversion unit 40 is within the normal range, and at the same time, the energy storage unit 70 discharges to supply power to the control unit 60, so that the control unit 60 keeps working normally. Of course, the length of time for which the capacitor and the energy storage unit 70 are powered is determined by the internal structure, such as capacity.
As the capacitor on the ac-dc conversion unit 40 is continuously discharged, the amount of power in the capacitor gradually decreases, resulting in a decrease in the voltage at the output of the ac-dc conversion unit 40. When the filter capacitor discharges for a certain period of time, the control unit 60 detects that the voltage at the output end of the ac-dc conversion unit 40 is less than or equal to the second preset value, and sends out the second control level, so that the switch unit 30 is turned on, and at this time, the external ac power supply 20 outputs ac to the ac-dc conversion unit 40, so that the ac-dc conversion unit 40 works normally, outputs dc, and simultaneously, the capacitor on the ac-dc conversion unit 40 is also charged. After the dc voltage output by the ac-dc conversion unit 40 is reduced by the dc-dc conversion unit 50, a voltage (e.g. 3.3V or 5V) with a certain value is output to supply power to the control unit 60, so as to maintain the normal operation of the control unit 60. In addition, after the ac-dc conversion unit 40 outputs the dc power, the voltage at the output terminal of the ac-dc conversion unit 40 gradually increases, and when the control unit 60 detects that the voltage at the output terminal of the ac-dc conversion unit 40 is greater than or equal to the first preset value, the control unit 60 outputs the first control level again, and turns off the switching unit 30, so that the external ac power supply 20 stops outputting the ac power.
In the above embodiment, the control unit 60 continuously cyclically outputs the first control level and the second control level so that the switching unit 30 cyclically switches as long as the display is in the standby state (i.e., the video processing unit has not detected the video signal input). Because the load of the display in the standby state is small, the long-time work of the ac-dc conversion unit 40 consumes much electric energy, so the embodiment of the invention prevents the ac-dc conversion unit 40 from being turned on for a long time by controlling the on-off time of the ac-dc conversion unit 40, thereby reducing the consumption of the ac-dc conversion unit 40 to the electric energy and further reducing the standby power of the display.
As shown in fig. 2, to sample the voltage at the output end of the ac-dc conversion unit 40, the display further includes a sampling unit 80, and an input end of the sampling unit 80 is connected to the output end of the ac-dc conversion unit 40, and an output end of the sampling unit 80 is connected to the fourth connection end of the control unit 60.
Further, as shown in fig. 3, the switch unit 30 may include a switch sub-unit 31 and a switch driving sub-unit 32, wherein an input end of the switch sub-unit 31 is connected to the external ac power source 20, an output end of the switch sub-unit 31 is connected to an input end of the ac-dc conversion unit 40, an input end of the switch driving sub-unit 32 is connected to a third connection end of the control unit 60, and an output end of the switch driving unit is connected to a control end of the switch sub-unit 31. Wherein the switch driving subunit 32 outputs a third control level when the control unit 60 outputs the first control level to control the switch subunit 31 to be turned off; the switch driving sub-unit 32 outputs a fourth control level when the control unit 60 outputs the second control level to control the switch sub-unit 31 to be turned on.
Further, as shown in fig. 4, the switch drive subunit 32 may include a drive leg 311 and a first isolation leg. The driving branch 311 may be a MOS transistor (Metal Oxide Semiconductor, metal oxide transistor) such as an N-MOS or a P-MOS and some necessary accessories, or may be a bipolar transistor (i.e. triode) and some necessary accessories, or may be some other controllable switch, which is not limited herein.
Preferably, the driving branch 311 includes a transistor Q1, a collector of the transistor Q1 is connected to an external power source, a base of the transistor Q1 is connected to a third connection end of the control unit 60, and an emitter of the transistor Q1 is grounded; the first isolation branch includes a first optocoupler U1, and a primary side of the first optocoupler U1 is connected to a collector of the transistor Q1, and a secondary side of the first optocoupler U1 is connected to a control terminal of the switching subunit 31.
Specifically, the first control level may be a low level, the second control level may be a high level, the transistor is turned off when the control unit 60 outputs the low level, the current output from the external power source enters the primary side of the first optocoupler U1, so that both the primary side and the secondary side of the first optocoupler U1 are turned on, and the first optocoupler U1 outputs a third control level (high level), thereby controlling the switching subunit 31 to be turned off; the transistor is turned on when the control unit 60 outputs a high level, and a current output from an external power source flows into the ground terminal through the collector and emitter of the transistor Q1, so that both the primary side and the secondary side of the first optocoupler U1 are turned off, thereby outputting a fourth control level (low level), and further controlling the switch subunit 31 to be turned on. Of course, the driving branch 311 may further include a pull-up resistor R6, where one end of the pull-up resistor R6 is connected to an external power source, and the other end is connected to the collector of the transistor Q1 to increase the voltage of the collector of the transistor Q1.
Further, the switching sub-unit 31 may include a second isolation branch and a control branch 321, an input end of the second isolation branch is connected to an output end of the switching driving sub-unit 32, an output end of the second isolation branch is connected to a control end of the control branch 321, an input end of the control branch 321 is connected to the external ac power source 20, and an output end of the control branch 321 is connected to an input end of the ac-dc conversion unit 40.
Specifically, the second isolation branch is turned off when the switch driving subunit 32 outputs the third control level, and the control branch 321 is turned off to prevent the ac power of the external ac power supply 20 from flowing in; the second isolation branch is turned on when the switch driving subunit 32 outputs the fourth control level, and turns on the control branch 321, and the ac power output from the external ac power supply 20 flows to the ac-dc conversion unit 40 via the control branch 321.
Further, the second isolation branch includes a second optocoupler U2, the control branch 321 includes a triac SCR1, a positive electrode of a primary side of the second optocoupler U2 is connected to an external power source, a negative electrode of the primary side of the second optocoupler U2 is connected to an output end of the switch driving subunit 32, a positive electrode of a secondary side of the second optocoupler U2 is connected to the external power source, a negative electrode of the secondary side of the second optocoupler U2 is connected to a control end of the triac SCR1, an input end of the triac SCR1 is connected to the external ac power source 20, and an output end of the triac SCR1 is connected to an input end of the ac-dc conversion unit 40.
Specifically, the 6 pin and the 4 pin of the second optocoupler U2 are turned on when the 4 pin and the 3 pin of the first optocoupler U1 are turned off, so as to control the on of the triac SCR 1; the 6 pin and the 4 pin of the second optocoupler U2 are disconnected when the 4 pin and the 3 pin of the first optocoupler U1 are connected, thereby controlling the turn-off of the triac SCR 1.
In another embodiment of the present invention, in order to store the electric energy output by the ac-dc conversion unit 40, the energy storage unit 70 includes an energy storage capacitor C1, and one end of the energy storage capacitor C1 is grounded to the output end of the dc-dc conversion unit 50. The energy storage capacitor C1 may be a filter capacitor in the dc-dc converter unit, or may be provided separately, and is not particularly limited herein. It will be appreciated that the energy storage capacitor C1 may be an equivalent capacitor, and may be replaced by a plurality of capacitors when implemented.
Of course, the display may also include a plurality of other energy storage units, and may be specifically disposed between the ac-dc conversion unit and the dc-dc conversion unit, such as the capacitor C2 shown in fig. 3.
In another embodiment of the present invention, the sampling unit 80 includes a first resistor R1 and a second resistor R2 sequentially connected in series, and one end of the first resistor R1 is connected to the output end of the ac-dc conversion unit 40, one end of the second resistor R2 is grounded, and the connection point of the first resistor R1 and the second resistor R2 forms the output end of the sampling unit 80.
In another embodiment of the present invention, in order to save components (save cost), the second external power supply may be the external ac power supply 20, the switch subunit 31 further includes a power supply branch 322, and the power supply branch 322 includes a diode D1, a fourth resistor R4, a fifth resistor R5, and a capacitor C4 with one end connected to a connection point of the fourth resistor R4 and the fifth resistor R5, where an anode of the diode D1 is connected to a live wire of the external ac power supply 20, one end of the fifth resistor R5 is connected to a positive electrode of the second side of the first optocoupler U1 and a positive electrode of the first side of the second optocoupler U2, and the other end of the capacitor C4 is connected to a zero line of the external ac power supply 20, and a negative electrode of the first side of the second optocoupler U2 is also connected to the zero line of the external ac power supply 20. The power supply branch 322 is mainly used for rectifying and filtering the ac power output by the external ac power supply 20 and then supplying power to the 4 pin of the first optocoupler U1 and the 1 pin of the second optocoupler U2.
In addition, a third resistor R3 may be connected between the switch unit 30 and the control unit 60, one end of the third resistor R3 is connected to the control end of the switch unit 30, and the other end of the third resistor R3 is connected to the third connection end of the control unit 60. The third resistor R3 is mainly used for limiting the current of the base and the emitter of the triode Q1 and preventing the current from being excessively large.
In addition, another embodiment of the present invention further provides a method for controlling standby power consumption of a display, which is applied to a control unit of the display, where the display includes the display provided in the foregoing embodiment, as shown in fig. 5, and the method for controlling standby power consumption of the display includes the following steps:
S1: when receiving the input signal without video signals sent by the video processing unit, a first control level is sent out to control the switch unit to be disconnected through the first control level, wherein the switch unit is conducted when the display is initially powered on.
In the above step, when receiving the no-video signal input signal sent by the video processing unit (i.e. when the display enters the standby state), the first control level is sent out, so that the switch unit is turned off, and the energy storage unit supplies power to the control unit. Of course, the switch unit is turned on when the display is initially powered on, so that the external power supply supplies power to the ac-dc conversion unit, and the ac-dc conversion unit supplies power to the dc-dc conversion unit, and the dc-dc conversion unit charges the energy storage unit and supplies power to the control unit.
S2: and when the voltage of the output end of the alternating current-direct current conversion unit is detected to be smaller than or equal to a second preset value, a second control level is sent out so as to control the switch unit to be conducted through the second control level.
In the above step, when the control unit detects that the voltage at the output end of the ac-dc conversion unit is less than or equal to the second preset value, the control unit sends out the second control level to make the switch unit conduct, so that the energy storage unit supplies power to the control unit.
S3: when the voltage of the output end of the alternating current-direct current conversion unit is detected to be larger than or equal to a first preset value, a first control level is sent out so as to control the switch unit to be turned off through the first control level.
In the above step, when the control unit detects that the voltage at the output end of the ac-dc conversion unit is greater than the preset value, the control unit sends out a first control level to disconnect the switch unit, so that the filter capacitor of the ac-dc conversion unit supplies power to the dc-dc conversion unit, and the energy storage unit supplies power to the control unit.
The specific description of the method for controlling the standby power consumption of the display may be described with reference to the embodiments of the display, which are not described herein. It should be understood that the sequence number of each step in the foregoing embodiment does not mean that the execution sequence of each process should be determined by the function and the internal logic, and should not limit the implementation process of the embodiment of the present invention.
The above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention, and are intended to be included in the scope of the present invention.
Claims (10)
1. The utility model provides a display, the display includes control unit, video processing unit, alternating current-direct current conversion unit and direct current-direct current conversion unit, the first link of control unit with video processing unit connects, its characterized in that: the display also comprises a switch unit and an energy storage unit, wherein the input end of the switch unit is used for being connected with an external alternating current power supply, the output end of the switch unit is connected with the input end of the alternating current-direct current conversion unit, the input end of the direct current-direct current conversion unit is connected with the output end of the alternating current-direct current conversion unit, the second connecting end of the control unit is connected with the output end of the direct current-direct current conversion unit, the third connecting end of the control unit is connected with the control end of the switch unit, the fourth connecting end of the control unit is connected with the output end of the alternating current-direct current conversion unit, and the energy storage unit is connected with the output end of the direct current-direct current conversion unit;
When the video processing unit does not detect that a video signal is input or the control unit detects that the voltage of the output end of the alternating current-direct current conversion unit is larger than or equal to a first preset value, the control unit sends out a first control level, the switch unit is disconnected, so that the capacitor of the alternating current-direct current conversion unit supplies power for the direct current-direct current conversion unit, and the energy storage unit supplies power for the control unit;
When the control unit detects that the voltage at the output end of the alternating current-direct current conversion unit is smaller than or equal to a second preset value, the control unit sends out a second control level, the switch unit is conducted so that an external alternating current power supply supplies power to the alternating current-direct current conversion unit, the alternating current-direct current conversion unit supplies power to the direct current-direct current conversion unit, and the direct current-direct current conversion unit charges the energy storage unit and supplies power to the control unit.
2. The display of claim 1, further comprising a sampling unit, wherein an input of the sampling unit is connected to an output of the ac-dc conversion unit, and wherein an output of the sampling unit is connected to a fourth connection of the control unit.
3. The display of claim 1, wherein the switching unit includes a switching sub-unit having an input terminal connected to the external ac power source, an output terminal connected to the input terminal of the ac-dc conversion unit, and a switching driving sub-unit having an input terminal connected to the third connection terminal of the control unit, and an output terminal connected to the control terminal of the switching sub-unit; wherein the switch driving subunit outputs a third control level when the control unit outputs the first control level, so as to control the switch subunit to be disconnected; the switch driving subunit outputs a fourth control level when the control unit outputs the second control level so as to control the switch subunit to be conducted.
4. The display of claim 3, wherein the switch drive subunit includes a drive leg and a first isolation leg; the driving branch circuit comprises a triode, the collector electrode of the triode is connected with a first external power supply, the base electrode of the triode is connected with the third connecting end of the control unit, and the emitter electrode of the triode is grounded; the first isolation branch comprises a first optical coupler, the primary side of the first optical coupler is connected with the collector electrode of the triode, and the secondary side of the first optical coupler is connected with the control end of the switch subunit.
5. The display of claim 4, wherein the switching sub-unit comprises a second isolation leg and a control leg, an input of the second isolation leg is connected to an output of the switching drive sub-unit, an output of the second isolation leg is connected to a control end of the control leg, an input of the control leg is connected to the external ac power source, and an output of the control leg is connected to an input of the ac-to-dc conversion unit.
6. The display of claim 5, wherein the second isolation branch comprises a second optocoupler, the control branch comprises a triac, a positive electrode of a primary side of the second optocoupler is connected to a second external power supply, a negative electrode of a primary side of the second optocoupler is connected to an output of the switching drive subunit, a positive electrode of a secondary side of the second optocoupler is connected to a second external power supply, a negative electrode of the secondary side of the second optocoupler is connected to a control terminal of the triac, an input terminal of the triac is connected to the external ac power supply, and an output terminal of the triac is connected to an input terminal of the ac-dc conversion unit.
7. The display of claim 1, wherein the energy storage unit comprises an energy storage capacitor, one end of the energy storage capacitor is connected with the output end of the direct current-direct current conversion unit, and the other end of the energy storage capacitor is grounded.
8. The display according to claim 2, wherein the sampling unit includes a first resistor and a second resistor connected in series in order, one end of the first resistor is connected to the output terminal of the ac-dc conversion unit, one end of the second resistor is grounded, and a connection point of the first resistor and the second resistor forms the output terminal of the sampling unit.
9. The display of claim 6, wherein the second external power source is the external ac power source, the switching subunit further comprises a power supply branch, and the power supply branch comprises a diode, a fourth resistor, a fifth resistor, and a capacitor, one end of which is connected to a connection point of the fourth resistor and the fifth resistor, in series, and an anode of the diode is connected to a live wire of the external ac power source, one end of the fifth resistor is connected to a positive electrode of the second side of the first optocoupler and a positive electrode of the first side of the second optocoupler, the other end of the capacitor is connected to a zero line of the external ac power source, and a negative electrode of the first side of the second optocoupler is further connected to a zero line of the external ac power source.
10. A display standby power consumption control method, characterized in that the display standby power consumption control method is applied to the display according to any one of claims 1 to 9;
The display standby power consumption control method comprises the following steps:
when receiving a video signal input signal without video sent by the video processing unit, sending a first control level to control a switch unit to be disconnected through the first control level, wherein the switch unit is conducted when the display is initially electrified;
when the voltage of the output end of the alternating current-direct current conversion unit is detected to be smaller than or equal to a second preset value, a second control level is sent out, and the switching unit is controlled to be conducted through the second control level;
and when the voltage of the output end of the alternating current-direct current conversion unit is detected to be larger than or equal to a first preset value, the first control level is sent out, so that the switching unit is controlled to be switched off through the first control level.
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