CN111048055A - Display and display standby power consumption control method - Google Patents
Display and display standby power consumption control method Download PDFInfo
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- CN111048055A CN111048055A CN201911368246.3A CN201911368246A CN111048055A CN 111048055 A CN111048055 A CN 111048055A CN 201911368246 A CN201911368246 A CN 201911368246A CN 111048055 A CN111048055 A CN 111048055A
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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
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.
Description
Technical Field
The invention relates to the field of electronic power, in particular to a display and a display standby power consumption control method.
Background
Energy conservation is an important social awareness in the world today, and refers to a series of actions that reduce energy consumption and increase energy utilization as much as possible. The energy-saving definition proposed by the world energy commission in 1979 is: all measures which are feasible technically, reasonable economically and acceptable environmentally and socially are adopted to improve the utilization efficiency of energy resources. The display is operated in a standby state most of the time. The power of the display is not turned off in the standby state, so the display also consumes power in the standby state. When the display is in standby, the light-load efficiency of the power supply is 40% to 50%, the efficiency is not high on the whole, the standby power consumption is still overlarge, and the reduction of the standby power consumption is still not ideal.
Disclosure of Invention
The embodiment of the invention provides a display and a display standby power consumption control method, which are used for reducing the power consumption of the display in standby.
The embodiment of the invention realizes the above 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 further 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 switched off, so that the capacitor of the alternating current-direct current conversion unit supplies power to the direct current-direct current conversion unit, and the energy storage unit supplies power to 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, and the control unit sends a second control level, the switch unit is switched on, 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 includes a sampling unit, an input end of the sampling unit is connected to an output end of the ac-dc conversion unit, and an output end of the sampling unit is connected to the fourth connection end of the control unit.
Preferably, the switch unit includes a switch subunit and a switch driving subunit, an input end of the switch subunit is connected to the external ac power supply, an output end of the switch subunit is connected to an input end of the ac-dc conversion unit, an input end of the switch driving subunit is connected to the third connection end of the control unit, and an output end of the switch driving unit is connected to the control end of the switch subunit; 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 switched off; and 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 driving subunit comprises a driving branch and a first isolation branch; the driving branch circuit comprises a triode, a collector of the triode is connected with a first external power supply, a base of the triode is connected with a third connecting end of the control unit, and an emitting 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 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 to an output end of the switch driving subunit, an output end of the second isolation branch is connected to a control end of the control branch, an input end of the control branch is connected to the external ac power supply, and an output end of the control branch is connected to an input end of the ac-dc conversion unit.
Preferably, the second isolation branch comprises a second optical coupler, the control branch comprises a triac, an anode of a primary side of the second optical coupler is connected to a second external power supply, a cathode of a primary side of the second optical coupler is connected to an output terminal of the switch driving subunit, an anode of a secondary side of the second optical coupler is connected to the second external power supply, a cathode of a secondary side of the second optical coupler 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.
Preferably, the energy storage unit includes an energy storage capacitor, one end of the energy storage capacitor is connected to the output end of the dc-dc conversion unit, and the other end of the energy storage capacitor is grounded.
Preferably, the sampling unit includes a first resistor and a second resistor connected in series in sequence, and one end of the first resistor is connected to the output end of the ac-dc conversion unit, one end of the second resistor is grounded, and the connection point of the first resistor and the second resistor constitutes the output end of the sampling unit.
Preferably, the second external power source is the external ac power source, 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 having one end connected to a connection point of the fourth resistor and the fifth resistor, in which the diode is connected to a live line of the external ac power source, one end of the fifth resistor is connected to an anode of a secondary side of the first optical coupler and an anode of a primary side of the second optical coupler, the capacitor is connected to the other end of the capacitor, and a cathode of the primary side of the second optical coupler is further connected to a neutral line of the external ac power source.
The embodiment of the invention also provides a display standby power consumption control method, which is applied to the display;
the display standby power consumption control method comprises the following steps:
when receiving a video signal input signal which is sent by the video processing unit, sending a first control level to control the switch unit to be switched off through the first control level, wherein the switch unit is switched on when the display is initially powered on;
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, sending a second control level to control the switch unit 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 greater than or equal to a first preset value, sending the first control level to control the switch unit to be switched off through the first control level.
According to the display and the standby power consumption control method of the display, the AC-DC conversion unit is prevented from being started for a long time by controlling the switching time of the AC-DC conversion unit, so that the consumption of the AC-DC 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 needed to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive labor.
FIG. 1 is a schematic diagram of a display according to an embodiment of the present 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 present invention
FIG. 4 is a circuit diagram of a display in another embodiment of the invention;
FIG. 5 is a flowchart illustrating a method for controlling standby power consumption of a display according to an embodiment of 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 some, not all, embodiments of the present invention. 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.
Fig. 1 is a schematic structural diagram of a display according to an embodiment of the present invention, which is mainly applied to a display and plays a role in reducing 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 switch unit 30 and an energy storage unit 70, wherein an input terminal of the switch unit 30 is connected to an external ac power supply 20, an output terminal of the switch unit 30 is connected to an input terminal of the ac-dc conversion unit 40, an input terminal of the dc-dc conversion unit 50 is connected to an output terminal of the ac-dc conversion unit 40, a first connection terminal of the control unit 60 is connected to the video processing unit 10, a second connection terminal of the control unit 60 is connected to an output terminal of the dc-dc conversion unit 50, a third connection terminal of the control unit 60 is connected to a control terminal of the switch unit 30, a fourth connection terminal of the control unit 60 is connected to an output terminal of the ac-dc conversion unit 40, the energy storage unit 70 is connected to an output terminal of the dc-dc conversion unit 50.
The control unit 60 may include an AD conversion module and a control chip, these modules may be integrated together or may be distributed, and the video processing unit may be designed integrally with the control unit, for example, as an integrated circuit, or may be separately provided, which is not limited herein. The AD conversion module is mainly used for detecting the voltage at the 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 performing control functions (for example, sending out a control level according to whether a video signal is input so as to control the on and off of the switch unit 30) and determining functions (for example, determining the voltage magnitude of the output end of the ac-dc conversion unit 40). The ac-dc conversion unit 40 is mainly used to convert ac power (e.g. 220V commercial power) output by the external ac power supply 20 into dc power, and it should be noted that the ac-dc conversion unit 40 usually includes some capacitors, such as filter capacitors, in this embodiment, the capacitors of the ac-dc conversion unit may be filter capacitors on the ac-dc conversion unit, or may be capacitors additionally provided, which is not limited herein. The dc-dc conversion unit 50 is mainly used for reducing the dc voltage output by the ac-dc conversion unit 40; the switching unit 30 is mainly used for controlling the input of the external ac power supply 20; the energy storage unit 70 is used for storing electric energy, and the storage amount thereof is determined by the internal structure thereof.
In the above display, when the control unit 60 detects that the voltage at the output terminal of the ac-dc conversion unit 40 is less than or equal to the second preset value, and the control unit 60 sends the second control level, the switch unit is turned on to supply the external power source 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 converting unit 40 is greater than or equal to the first preset value, the control unit 60 sends a first control level, the switch unit 30 is turned off, so that the filter capacitor of the ac-dc converting unit 40 supplies power to the dc-dc converting unit, and the energy storage unit 70 supplies power to the control unit 60.
Specifically, when the ac power supply of the display is initially powered on (i.e., when the external ac power supply 20 outputs ac power), after the switching unit 30 is turned on, the ac-dc conversion unit 40 starts to operate and outputs dc power to power 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 to turn off the switching unit 30. After the switching unit 30 is turned off, the capacitor of the ac-dc conversion unit 40 discharges, so that the control unit 60 detects that the voltage at the output terminal of the ac-dc conversion unit 40 is in 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 power supply time of the capacitor and the energy storage unit 70 is determined by its internal structure, such as capacity.
As the capacitor in the ac-dc conversion unit 40 is continuously discharged, the amount of electricity in the capacitor gradually decreases, resulting in a decrease in the voltage at the output terminal of the ac-dc conversion unit 40. When the filter capacitor is discharged for a certain period of time, and 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, a second control level is sent out to turn on the switch unit 30, and at this time, the external ac power supply 20 outputs ac power to the ac-dc conversion unit 40, so that the ac-dc conversion unit 40 normally operates to output dc power, and meanwhile, the capacitor on the ac-dc conversion unit 40 is also charged. The dc power output from the ac-dc conversion unit 40 is stepped down by the dc-dc conversion unit 50, and then outputs a certain voltage (e.g. 3.3V or 5V) to power 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, so that the switching unit 30 is turned off, so that the external ac power supply 20 stops outputting the ac power.
In the above embodiment, as long as the display is in the standby state (i.e., the video processing unit has not detected the input of the video signal), the control unit 60 continuously and cyclically outputs the first control level and the second control level, so that the switching unit 30 cyclically switches. Because the load of the display in the standby state is very small, and the long-time operation of the ac-dc conversion unit 40 consumes much electric energy, the embodiment of the present invention prevents the ac-dc conversion unit 40 from being turned on for a long time by controlling the on-off duration of the ac-dc conversion unit 40, thereby reducing the consumption of the ac-dc conversion unit 40 on the electric energy and further reducing the standby power of the display.
As shown in fig. 2, in order to sample the voltage at the output terminal of the ac-dc conversion unit 40, the display further includes a sampling unit 80, an input terminal of the sampling unit 80 is connected to the output terminal of the ac-dc conversion unit 40, and an output terminal of the sampling unit 80 is connected to the fourth connection terminal of the control unit 60.
Further, as shown in fig. 3, the switch unit 30 may include a switch subunit 31 and a switch driving subunit 32, wherein an input terminal of the switch subunit 31 is connected to the external ac power supply 20, an output terminal of the switch subunit 31 is connected to an input terminal of the ac-dc converting unit 40, an input terminal of the switch driving subunit 32 is connected to the third connection terminal of the control unit 60, and an output terminal of the switch driving unit is connected to the control terminal of the switch subunit 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 switched off; the switch driving subunit 32 outputs a fourth control level when the control unit 60 outputs the second control level to control the switch subunit 31 to be turned on.
Further, as shown in fig. 4, the switch driving subunit 32 may include a driving branch 311 and a first isolation branch. The driving branch 311 may be a Metal Oxide Semiconductor (MOS transistor), such as an N-MOS or a P-MOS, and some necessary accessories, a bipolar transistor (i.e., a triode) and some necessary accessories, or some other controllable switches, 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 the third connection terminal of the control unit 60, and an emitter of the transistor Q1 is grounded; the first isolation branch comprises a first optocoupler U1, 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 switch subunit 31.
Specifically, the first control level may be a low level, the second control level may be a high level, the triode is turned off when the control unit 60 outputs the low level, a current output by the external power source enters the primary side of the first optocoupler U1, and both the primary side and the secondary side of the first optocoupler U1 are turned on, so that the first optocoupler U1 outputs a third control level (high level), and the switch subunit 31 is controlled to be turned off; when the control unit 60 outputs a high level, the transistor is turned on, and a current output from the external power source flows into the ground terminal via 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, and 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, so as to increase the voltage at the collector of the transistor Q1.
Further, the switch subunit 31 may include a second isolation branch and a control branch 321, an input end of the second isolation branch is connected to the output end of the switch driving subunit 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 supply 20, and an output end of the control branch 321 is connected to an input end of the ac-dc converting 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 made to disconnect 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, so that the ac power output by the external ac power supply 20 flows to the ac-dc converting unit 40 through the control branch 321.
Furthermore, the second isolation branch comprises a second optical coupler U2, the control branch 321 comprises a triac SCR1, a positive electrode of a primary side of the second optical coupler U2 is connected to the external power source, a negative electrode of a primary side of the second optical coupler U2 is connected to the output terminal of the switch driving subunit 32, a positive electrode of a secondary side of the second optical coupler U2 is connected to the external power source, a negative electrode of a secondary side of the second optical coupler U2 is connected to the control terminal of the triac SCR1, an input terminal of the triac SCR1 is connected to the external ac power source 20, and an output terminal of the triac SCR1 is connected to the input terminal of the ac-dc conversion unit 40.
Specifically, the pins 6 and 4 of the second optocoupler U2 are turned on when the pins 4 and 3 of the first optocoupler U1 are turned off, so as to control the turn-on of the triac SCR 1; pins 6 and 4 of the second optocoupler U2 are off when pins 4 and 3 of the first optocoupler U1 are on, thereby controlling the triac SCR1 to turn off.
In another embodiment of the present invention, in order to store the electric energy output by the ac-dc converting unit 40, the energy storing unit 70 includes an energy storing capacitor C1, one end of the energy storing capacitor C1 is connected to the output terminal of the dc-dc converting unit 50, and the other end of the energy storing capacitor C1 is grounded. The energy storage capacitor C1 may be formed by a filter capacitor inside the dc-dc conversion unit, or may be separately provided, which is not limited herein. It is understood that the energy storage capacitor C1 may be equivalent capacitors, and multiple capacitors may be used instead in specific implementations.
Of course, the display may also include a plurality of other energy storage units, which may be 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 connected in series in sequence, and one end of the first resistor R1 is connected to the output terminal 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 constitutes the output terminal of the sampling unit 80.
In another embodiment of the present invention, in order to save components (save cost), the second external power source may be an external ac power source 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 having one end connected to a connection point of the fourth resistor R4 and the fifth resistor R5, in which the anode of the diode D1 is connected to a live line of the external ac power source 20, one end of the fifth resistor R5 is connected to an anode of a secondary side of the first optocoupler U1 and an anode of a primary side of the second optocoupler U2, the other end of the capacitor C4 is connected to a zero line of the external ac power source 20, and a cathode of the primary side of the second optocoupler U2 is further connected to a zero line of the external ac power source 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 terminal of the switch unit 30, and the other end of the third resistor R3 is connected to the third connection terminal of the control unit 60. The third resistor R3 is mainly used to limit the base and emitter currents of the transistor Q1, and prevent the currents from being too 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, and as shown in fig. 5, the method for controlling standby power consumption of the display includes the following steps:
s1: when receiving a video signal input signal which is sent by the video processing unit, sending a first control level to control the switch unit to be switched off through the first control level, wherein the switch unit is switched on when the display is initially powered on.
In the above steps, when receiving the input signal without the video signal sent by the video processing unit (i.e. when the display enters the standby state), the first control level is sent out to turn off the switch unit, so that 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, so that 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 less than or equal to a second preset value, sending a second control level to control the switch unit to be conducted through the second control level.
In the above step, when detecting 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 turn on the switch unit, so that the energy storage unit supplies power to the control unit.
S3: and when the voltage of the output end of the alternating current-direct current conversion unit is detected to be greater than or equal to a first preset value, sending a first control level to control the switch unit to be switched off through the first control level.
In the above step, when detecting that the voltage at the output end of the ac-dc conversion unit is greater than the preset value, the control unit sends out the first control level to turn off 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 standby power consumption control method of the display device can be described with reference to the embodiments of the display device, and is not repeated herein. It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.
The above examples are only intended to illustrate the technical solution of the present invention and not to limit it; although the present 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 solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (10)
1. A display comprises a control unit, a video processing unit, an AC-DC conversion unit and a DC-DC conversion unit, wherein a first connection end of the control unit is connected with the video processing unit, and the display is characterized in that: the display further 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 switched off, so that the capacitor of the alternating current-direct current conversion unit supplies power to the direct current-direct current conversion unit, and the energy storage unit supplies power to 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, and the control unit sends a second control level, the switch unit is switched on, 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.
2. The display according to claim 1, wherein the display further comprises a sampling unit, and an input terminal of the sampling unit is connected to an output terminal of the ac-dc conversion unit, and an output terminal of the sampling unit is connected to a fourth connection terminal of the control unit.
3. The display device according to claim 1, wherein the switch unit comprises a switch subunit and a switch driving subunit, an input terminal of the switch subunit is connected to the external ac power supply, an output terminal of the switch subunit is connected to an input terminal of the ac-dc conversion unit, an input terminal of the switch driving subunit is connected to the third connection terminal of the control unit, and an output terminal of the switch driving unit is connected to the control terminal of the switch subunit; 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 switched off; and 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 branch and a first isolation branch; the driving branch circuit comprises a triode, a collector of the triode is connected with a first external power supply, a base of the triode is connected with a third connecting end of the control unit, and an emitting 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 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 according to claim 4, wherein the switch subunit comprises a second isolation branch and a control branch, an input end of the second isolation branch is connected to the output end of the switch driving subunit, an output end of the second isolation branch is connected to a control end of the control branch, an input end of the control branch is connected to the external AC power supply, and an output end of the control branch is connected to an input end of the AC-DC conversion unit.
6. The display device according to claim 5, wherein the second isolation branch comprises a second optical coupler, the control branch comprises a triac, and an anode of a primary side of the second optical coupler is connected to a second external power supply, a cathode of a primary side of the second optical coupler is connected to the output terminal of the switch driving subunit, an anode of a secondary side of the second optical coupler is connected to the second external power supply, a cathode of a secondary side of the second optical coupler 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 the input terminal of the ac-dc conversion unit.
7. The display device as claimed in claim 1, wherein the energy storage unit comprises an energy storage capacitor, one end of the energy storage capacitor is connected to the output end of the dc-dc conversion unit, and the other end of the energy storage capacitor is grounded.
8. The display device according to claim 2, wherein the sampling unit comprises a first resistor and a second resistor connected in series in sequence, and one end of the first resistor is connected with the output end 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 constitutes the output end of the sampling unit.
9. The display according to claim 6, wherein the second external power source is the external ac power source, 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 having one end connected to a connection point of the fourth resistor and the fifth resistor, which are sequentially connected in series, and an anode of the diode is connected to a live line of the external ac power source, one end of the fifth resistor is connected to an anode of a secondary side of the first optocoupler and an anode of a primary side of the second optocoupler, the other end of the capacitor is connected to a neutral line of the external ac power source, and a cathode of the primary side of the second optocoupler is further connected to a neutral line of the external ac power source.
10. A display standby power control method, wherein the display standby power 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 which is sent by the video processing unit, sending a first control level to control the switch unit to be switched off through the first control level, wherein the switch unit is switched on when the display is initially powered on;
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, sending a second control level to control the switch unit 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 greater than or equal to a first preset value, sending the first control level to control the switch unit to be switched off through the first control level.
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| CN112133251A (en) * | 2020-10-30 | 2020-12-25 | 歌尔科技有限公司 | Wearable device display control method and wearable device |
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| CN112133251A (en) * | 2020-10-30 | 2020-12-25 | 歌尔科技有限公司 | Wearable device display control method and wearable device |
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