CN114006529A

CN114006529A - Power supply control system of display

Info

Publication number: CN114006529A
Application number: CN202111280675.2A
Authority: CN
Inventors: 魏浩
Original assignee: BOE Technology Group Co Ltd; K Tronics Suzhou Technology Co Ltd
Current assignee: BOE Technology Group Co Ltd; K Tronics Suzhou Technology Co Ltd
Priority date: 2021-10-29
Filing date: 2021-10-29
Publication date: 2022-02-01

Abstract

An embodiment of the present invention provides a power control system of a display, including: the Type-C interface is used for being connected with an external Type-C power adapter, voltage output by the Type-C power adapter is input into the power system through the Type-C interface, and the voltage output by the Type-C power adapter is in direct proportion to the power of the power system; the main control chip is used for detecting the working mode of the display and sending the working mode to the power transmission chip, and the working mode of the display comprises the following steps: starting up, normally displaying, waiting or shutting down; and the power transmission chip is used for controlling the power of the power supply system according to the working mode of the display. The embodiment of the invention can meet the energy consumption requirement when the display enters standby and is shut down.

Description

Power supply control system of display

Technical Field

The invention relates to the technical field of batteries, in particular to a power supply control system of a display.

Background

When the current, the Type C interface is more and more widely used, and some displays are also matched with Type C chargers. However, after the display works in the related art, the load of the whole display is relatively high, and is as high as 135W, so that the power of the selected adapter is relatively high, and exceeds the 100W condition. In order to meet the requirement of an LPS (Limited Power Supply), the adapter is a customized adapter, and after the adapter is connected to a display, the display enters a working state after the adapter and the display are successfully communicated through a Type C PD (Power Delivery) protocol.

Different electronic consumer products of the display have energy consumption requirements of standby and shutdown, and how to realize the energy consumption requirements needs special treatment on the aspect of power supply control of the display.

Disclosure of Invention

The invention aims to provide a power supply control system of a display, which can meet the energy consumption requirements when the display is in standby and is turned off.

In order to achieve the above purpose, the invention provides the following technical scheme:

in one aspect, a power control system for a display is provided, including:

the Type-C interface is used for being connected with an external Type-C power adapter, voltage output by the Type-C power adapter is input into a power supply system through the Type-C interface, and the voltage output by the Type-C power adapter is in direct proportion to the power of the power supply system; the main control chip is used for detecting the working mode of the display and sending the working mode to the power transmission chip, and the working mode of the display comprises the following steps: starting up, normally displaying, waiting or shutting down; and the power transmission chip is used for controlling the power of the power supply system according to the working mode of the display.

Optionally, the power transmission chip is specifically configured to:

when the working mode of the display is standby, the power of the power transmission chip controls the power supply system to be less than 0.5W; or

And when the working mode of the display is shutdown, the power transmission chip controls the power of the power supply system to be less than 0.3W.

Optionally, the power supply system comprises:

a first power module comprising: a power supply for the display;

a second power module comprising: the first power supply of the main control chip, the power supply of the double-rate synchronous dynamic random access memory in the main control chip and the first power supply of the Android system are connected;

a third power module comprising: the power supply of the open audio platform and the second power supply of the Android system are connected;

a fourth power module comprising: the first power supply of concentrator, the second power supply of main control chip, the second power supply of concentrator.

Optionally, the power control system of the display further includes: the direct current-direct current conversion circuit comprises a direct current-direct current conversion chip, a voltage conversion circuit and a power supply system, wherein the direct current-direct current conversion chip is used for converting voltage input to the power supply system;

the DC-DC conversion chip includes:

a first dc-dc conversion unit for converting a voltage input to a first power module of the power supply system;

a second dc-dc conversion unit for converting a voltage input to a second power module of the power supply system;

a third dc-dc conversion unit for converting a voltage input to a third power module of the power supply system;

and the fourth direct current-direct current conversion unit is used for converting the voltage input to the first power supply module of the power supply system.

Optionally, the power transmission chip is specifically configured to:

when the working mode of the display is standby, sending a first indication message to the Type-C power adapter to indicate that the output voltage of the Type-C power adapter is reduced from 20V to 9V, controlling the first direct current-direct current conversion unit to stop working, controlling the second direct current-direct current conversion unit to work normally, controlling the third direct current-direct current conversion unit to work normally, and controlling the fourth direct current-direct current conversion unit to work normally, so that the power supply system is smaller than 0.5W; or

When the working mode of the display is shutdown, sending second indication information to the Type-C power adapter to indicate that the output voltage of the Type-C power adapter is reduced from 20V to 5V, controlling the first direct current-direct current conversion unit to stop working, stopping the second direct current-direct current conversion unit to work, stopping the third direct current-direct current conversion unit to work, and normally working the fourth direct current-direct current conversion unit, so that the power of the power supply system is less than 0.3W.

Optionally, the working voltages of the first dc-dc conversion unit, the second dc-dc conversion unit, the third dc-dc conversion unit and the fourth dc-dc conversion unit are all 4.5V to 30V.

Optionally, the power control system of the display further includes: and the touch switch is used for providing the voltage output by the Type-C interface to the direct current-direct current conversion chip under the control of the power transmission chip.

In the power control system of the display, the touch switch is a field effect transistor.

In the power control system of the display, the power transmission chip comprises an integrated circuit bus, and the main control chip is specifically used for detecting the working mode of the display and sending the working mode of the display to the power transmission chip through the integrated circuit bus.

Optionally, the power control system of the display further includes:

and the low-dropout linear voltage stabilizing chip is used for providing voltage for the power transmission chip when the display is started or shut down.

Optionally, the operating voltage of the low dropout linear regulator chip is 5V.

Optionally, the operating voltage of the power transmission chip is 4V to 5.5V.

The embodiment of the invention has the following beneficial effects:

the embodiment of the invention can close the power module which does not need to work when the display enters the standby mode and the shutdown mode under the control of the scaler and the PD IC, thereby realizing the energy consumption requirement when the display enters the standby mode and the shutdown mode.

Drawings

FIG. 1 is an end view of a receptacle of a Type C interface of the related art;

FIG. 2 is a plug lead-out end view of a Type C interface of the related art;

FIG. 3 is a diagram of a power control system of a first display according to an embodiment of the present invention;

fig. 4 is a specific circuit structure diagram of a power control system of a display according to an embodiment of the present invention;

FIG. 5 is a diagram of a power control system of a second display according to an embodiment of the present invention;

fig. 6 is a structural diagram of a dc-dc conversion chip according to an embodiment of the present invention;

FIG. 7 is a block diagram of a power control system of a third display according to an embodiment of the present invention;

FIG. 8 is a diagram illustrating a power control system of a fourth display according to an embodiment of the present invention;

FIG. 9 is a flowchart illustrating a power control system of a display device in a standby mode according to an embodiment of the present invention;

FIG. 10 is a flowchart illustrating operation of a power control system of a display in a power-off mode according to an embodiment of the present invention;

fig. 11 is a flowchart illustrating a power control system of a display device according to an embodiment of the present invention from start-up to normal operation.

Detailed Description

In order to make the technical problems, technical solutions and advantages to be solved by the embodiments of the present invention clearer, the following detailed description will be given with reference to the accompanying drawings and specific embodiments.

Type C is an appearance standard of USB interface, does not divide and just can insert on the two sides, and the same functions such as charging, data transmission, display output that support the USB standard with Type A and Type B. The Type C interface can two-way power supply, both can charge for equipment self, also can supply power for external equipment. The portable power source generally adopts Type C interface.

FIG. 1 is an end view of a receptacle of a Type C interface of the related art; figure 2 is a plug exit end view of a Type C interface of the related art. Referring to FIGS. 1 and 2, Type C has 4 pairs of TX/RX differential lines, 1 pair of USBD +/D-, 1 pair of SBU lines, 2 CC lines, and 4 VBUS and 4 ground lines. The CC line is mainly used for communication of a Power Delivery (PD) chip, and is used for judging the insertion direction of equipment: the host uses CC1 to communicate with the device in case of forward insertion or reverse insertion, and the reverse insertion uses CC2, which shows that the CC uses a single wire protocol.

In the related art, the input voltage of the Type C charging adapter is 100-240V, and the input frequency is 50Hz or 60 Hz. The output of Type C charging adapter does: 5V/3A or 9V/3A or 12V/5A or 15V/5A or 20V/4.7A or 20V/6.75A, wherein the maximum output power of the Type C charging adapter is 135W.

The display in the related art uses a Type C charging adapter of up to 135W due to high overall power consumption, and is limited by the regulatory requirements of the LPS, and the adapter is a customized adapter. The adapter has used the Type C interface, so the adapter also needs to satisfy the PD agreement, and the Type C interface that charges of display also can carry out the PD agreement with the adapter and communicate as load, display simultaneously. Meanwhile, the display has power consumption requirements of standby and shutdown, so that special treatment needs to be performed on the power supply of the display in terms of control.

The embodiment of the invention provides a power supply control system of a display, aiming at the problem that the power supply of the display needs special treatment in the aspect of control in the prior art.

Referring to fig. 3, fig. 3 is a structural diagram of a power control system of a first display according to an embodiment of the present invention. The power control system of the display includes: the Type-C interface is used for being connected with an external Type-C power adapter, voltage output by the Type-C power adapter is input into a power supply system through the Type-C interface, and the voltage output by the Type-C power adapter is in direct proportion to the power of the power supply system; the main control chip is used for detecting the working mode of the display and sending the working mode to the power transmission chip, and the working mode of the display comprises the following steps: starting up, normally displaying, waiting or shutting down;

and the power transmission chip is used for controlling the power of the power supply system according to the working mode of the display.

Optionally, the working voltage of the power transmission chip is 4V-5.5V, so that the situation that a device supplying power to the power transmission chip cannot work due to voltage drop can be avoided.

Optionally, the power control system of the display further includes a low dropout linear regulator chip, configured to provide a voltage to the power transmission chip when the display is turned on or turned off. The low dropout linear regulator chip enables the difference between the input and output voltages to be less than 500 mV. Referring to fig. 7, fig. 7 is a structural diagram of a power control system of a third display according to an embodiment of the present invention, and fig. 7 shows a low dropout linear regulator chip.

Fig. 4 is a specific circuit structure diagram of a power control system of a display according to an embodiment of the present invention; referring to fig. 4, a Power Delivery Integrated Circuit (PD IC) is used to communicate with the charging adapter to inform the charging adapter of the required Power.

The PD IC can also work at less than 5V, because the LDO IC (Low drop out Regulator Integrated Circuit) has a voltage drop, and when the LDO inputs 5V, the output is less than 5V, so the power supply of the PD IC is less than 5V at this time, and the PD IC is required to work.

The PD IC provided by the embodiment of the invention can be applied to work at a sink end, namely, the current of an external circuit can flow into the PD IC.

Optionally, the power transmission chip includes an Integrated Circuit bus IIC (Inter-Integrated Circuit), and the main control chip is specifically configured to detect a working mode of the display, and send the working mode of the display to the power transmission chip through the Integrated Circuit bus.

In addition, the PD IC is also provided with a GPIO (General-Purpose Input/Output) port. A GPIO port requires at least two registers, one as a control register and one as a data register. Each bit of the data register corresponds to a hardware pin of the GPIO, the data transmission direction is set through the control register, and the data flow direction of each bit pin can be set through the control register.

The LDO chip enable pin (chip enable pin) is normal high and is connected to a GPIO control pin of the scaler IC. In this way, the LDO can work as long as a power supply is input after the power supply is started; after the main control chip (scaler) works, the Enable pin can be pulled down through the Type _ C _ LDO _ EN, so that the LDO IC is closed. The LDO IC works only when the power adapter inputs 5V, namely works in two states of starting and shutting down the system. The LDO IC enables the difference between the input and output voltages to be below 500 mV.

When the computer is started, the PD IC does not work without a power supply. At the moment, the communication between the PD IC and the power adapter does not involve software communication, the PD IC is connected with the pull-up resistor and the pull-down resistor at two ends of the CC channel, and after the connection is normal, the Type C adapter outputs 5V voltage.

In a normal display, "5V _ DVCC _ 1" power network and "POW _ 4.5V" simultaneously power PD IC RTS5452E, and are in an or relationship.

And during standby, the PD IC uses the LDO IC to supply power, and at the moment, the LDO inputs 5V and outputs 4.5V, so that the efficiency is high, and the standby power consumption is not influenced.

Optionally, the power supply system comprises:

a first power module comprising: a power supply for the display;

Optionally, the power control system of the display further comprises: the direct current-direct current conversion circuit comprises a direct current-direct current conversion chip, wherein the direct current-direct current conversion chip is used for converting voltage input to a power supply system. Referring to fig. 5, fig. 5 is a structural diagram of a power control system of a second display according to an embodiment of the present invention, and fig. 5 shows a dc-dc conversion chip.

Fig. 6 is a structural diagram of a dc-dc conversion chip according to an embodiment of the present invention, where the dc-dc conversion chip includes:

Referring to fig. 4, the first dc-dc conversion unit is U39, and U39 is turned off during standby and turned off during shutdown.

The second direct current-direct current conversion unit is U40, and U40 works in standby and is closed in shutdown;

the third DC-DC conversion unit is U41, and U41 works in standby and is closed in shutdown;

the fourth dc-dc conversion unit is U42, and U42 operates in standby and shutdown.

The VBUS is output to a direct current-direct current conversion chip of a power control system, the input voltage range of the connected direct current-direct current conversion chip is wide, although the normal working voltage is 20V, the voltage is reduced to 9V and 5V when the power control system is in standby and shutdown. The Input Voltage Range (Input Voltage Range) of the four selected DC to DC chips of U39, U40, U41 and U42 is 4.5-30V. Under the normal working voltage of 20V, U39, U40, U41 and U42 work; when the Type C adapter voltage is reduced to 9V in standby, the U39, U40 and U41 can normally work, the Enable control pins of the chips are controlled by the scaler IC, the system can be awakened when a signal is input, and the U42 is not controlled and continuously keeps a working state; when the voltage of the Type C adapter is reduced to 5V during shutdown, U39, U40, U41 and U42 can work if the control of a scaler is not available. However, in order to meet the requirement of reducing power consumption, the U39, the U40 and the U41 are closed under the control of the scaler, and the U42 is not controlled externally and can still work normally. The U42 needs to work normally because the user needs to be able to restore the scaler when pressing the power-on key, so that the system can be restored to normal operation. Specifically, the scaler controls U39 through a POWER _5V _ EN network; similarly, scaler controls U40 through the POWER _5V _ EN network; the scaler controls U41 through the PW _5V _ VDD _2_ EN network.

The direct current-direct current conversion chip provided by the embodiment of the invention has a wide Input Voltage Range, can support an Input Voltage Range (Input Voltage Range) of 4.5-30V, and can work not only when the normal working Voltage is 20V, but also when the Voltage is reduced to 9V or 5V during standby and shutdown.

It should be noted that 1.1V _ SYS _ ON (for the scaler IC) needs a single conversion, that is, a module to be operated when the scaler IC is turned off needs a single voltage conversion, and the 3.3V _ SYS cannot be converted by 5V of the power network 20V → U40/U41 → 5V. Because 20V input by the adapter drops to 5V at shutdown. The embodiment of the invention realizes voltage conversion by 'adapter input power → U42 → 3.3V _ SYS → U4 → 1.1V _ SYS _ ON', at this time, the power network 'adapter input power 5V → U42 → 3.3V → U4 → 1.1V' can continue to work, but U40/U41 can not continue to work.

As shown in fig. 4, the first POWER module only includes a POWER supply of the display, i.e., a POWER supply of an oc (open cell), i.e., a POWER supply of a tft (thin Film transistor) lcd (liquid Crystal display), and the scaler IC can control the switch of the U39 through the POWER _5V _ EN network channel.

As shown in fig. 4, the second power supply module includes: the first POWER supply of the main control chip, the POWER supply of the double-rate synchronous dynamic random access memory in the main control chip, the first POWER supply of the Android system and the scaler IC can control U40 through a POWER _5V _ EN network channel. The first power supply U55 of the Android system is controlled through the PD IC through a 5V _ Android _ EN network.

The third power module includes: the power supply of the open audio platform, the second power supply of Android system. The open Audio platform US-DA14195 may be turned off under the control of the 5V _ DSP output from VOUT2 of U55, and the PD IC controls U55 through the Audio _ DSP _5V _ EN network. The second power supply U41 of the Android system may be controlled by PW _5V _ VDD _2_ EN of the scaler IC.

A fourth power module comprising: the first power of HUB HUB, the second power of main control chip, the second power of HUB HUB. The first power supply U8 of U22 HUB may be controlled by a PD IC1.2V _ HUB _ LG _ EN network channel. The second power supply 1.1V _ SYS _ ON of the scaler is kept in a normally open state and cannot be closed. The output of terminal VOUT2 of the second power supply U43 of U22 HUB is controlled by the PD IC through the 5V _ USB _ HUB _ EN network. In addition, the fourth power module also includes power supplies of other module chips, and also serves as a 3.3V pull-up voltage for some lines, and the 3.3V _ DVCC output from the VOUT1 terminal of U43 is controlled by the PWR _3.3V _ ON network of the scaler.

The power outputs of the U39, the U40, the U41 and the U42 are respectively supplied to different modules, and careful planning is needed for related modules which can be closed under standby and shutdown conditions, and the design of the part is concerned about whether standby power consumption and shutdown power consumption meet related energy consumption requirements.

The power adapter consumes power differently at 20V, 9V, 5V outputs. The lower the output voltage of the power adapter, the lower the power consumption of the power adapter itself, and therefore, the output voltage of the power adapter decreases during standby and shutdown.

Optionally, the power control system of the display further includes: and the touch switch is used for providing the voltage output by the Type-C interface to the direct current-direct current conversion chip under the control of the power transmission chip. Referring to fig. 8, fig. 8 illustrates a touch switch.

Optionally, the touch switch is a field effect transistor.

Referring to fig. 4, Q41 is a mos transistor, and the PD IC controls its switch through a Type _ C _ IN _ EN network, so as to control VBUS to supply power to the power supply system, but before VBUS supplies power to the power supply system, the voltage needs to be processed through a dc-dc conversion chip.

Q46 is also a mos transistor, and when the system is shut down or VBUS voltage is reduced, the PD IC controls Q46 to DISCHARGE quickly to ground through the Type _ IN _ DISCHARGE network.

Optionally, the power transmission chip is specifically configured to:

when the working mode of the display is standby, sending a first indication message to the Type-C power adapter to indicate that the output voltage of the Type-C power adapter is reduced from 20V to 9V, controlling the first direct current-direct current conversion unit to stop working, controlling the second direct current-direct current conversion unit to work normally, controlling the third direct current-direct current conversion unit to work normally, and controlling the fourth direct current-direct current conversion unit to work normally, so that the power of a power supply system is less than 0.5W; or

When the working mode of the display is shutdown, sending second indication information to the Type-C power adapter to indicate that the output voltage of the Type-C power adapter is reduced from 20V to 5V, controlling the first direct current-direct current conversion unit to stop working, stopping the second direct current-direct current conversion unit, stopping the third direct current-direct current conversion unit, and normally working the fourth direct current-direct current conversion unit, so that the power of the power supply system is less than 0.3W.

Fig. 9 is a flowchart illustrating a working process of the power control system of the display in the standby mode according to the embodiment of the present invention.

Referring to fig. 9, the process of reducing the power consumption of the power control system of the display to 0.38W when entering the standby mode will be described in detail.

At the beginning, the power control system works normally, and the system enters a standby mode under the condition of no signal source input. The scaler informs the PD via the IIC channel that the IC system will enter standby mode. The PD IC knows that the system will enter standby mode, and the PD IC communicates with the adapter to let the adapter input 9V, 20V _ TYPE _ IN _ VBUS drop from 20V to 9V. At this time, U39 is closed, U40, U41 and U42 still work normally. There will be some modules working inside the scaler IC for system activation. Scaler turns off other functions of the system. The system enters a standby mode, and the power consumption of the whole system is reduced to 0.38W (less than 0.5W).

Fig. 10 is a flowchart illustrating a working process of the power control system of the display in the shutdown mode according to the embodiment of the present invention, and referring to fig. 10, a process of reducing power consumption of the power control system of the display to 0.185W when the power control system of the display enters the shutdown mode will be described in detail below. Initially, the system is operating normally or the system is in a standby mode. The user closes the display through the key, and the system enters a power-off state. Scaler informs the PD IC system to enter the shutdown mode through the IIC channel. The PD IC knows that the system will enter the shutdown mode, and the PD IC communicates with the adapter to let the adapter output 5V, and 20V _ TYPE _ IN _ VBUS is reduced to 5V. U39, U40, U41 are off, and U42(3.3V _ SYS output supply scaler) is working normally. some modules work inside the scaler IC, and if the display is started by the control key, the system can recover to work. Scaler turns off other functions of the system. The output Type _ C _ LDO _ EN of Scaler also restores the normal state, causing the Enable pin of LDO IC to also become high; u40 is turned off, no output, and power supply 5V _ DVCC _1 drops to 0V. Therefore, the LDO IC resumes operation and the PD IC is powered by the LDO IC. At this time, the LDO voltage input is 5V and the output is 4.5V. The system enters a shutdown mode, and the power consumption of the whole system is reduced to 0.185W (less than 0.3W).

Referring to fig. 11, the process of the power control system of the display entering into normal operation will be described in detail.

Initially, the Type C interface of the display is plugged into the Type C adapter. The PD IC in the adapter and the PD IC in the display carry out CC pin communication (the power end resistor is pulled up, and the suction end resistor is pulled down). In the initial state, the PD IC is not powered and does not operate. The communication at this time does not involve software communication, and only the source end adapter outputs 5V voltage through connection of the pull-up resistor and the pull-down resistor at two ends of the CC pin.

After the initial communication is successful, VBUS of Type C inputs 5V power, i.e. 20V _ Type _ IN _ LDO — 5V. The LDO IC works (the Enable pin of the chip is normal high), 4.5V (POW-4.5V network) is output, the PD IC is powered, the power supply of the LDO IC is 4V of minimum working voltage, the typical value is 5V, and the maximum value is 5.5V. The Enable pin of the LDO IC is normal high, so that the LDO IC can work as long as a power supply is input; after the scaler works, the pin can be pulled low through the Type _ C _ LDO _ EN, so that the LDO chip is turned off.

The PD IC is electrified to work, the PD IC carries out information interaction with a PD chip IN the adapter through the CC pin, and the adapter is informed to output 20V voltage, namely 20_ TYPE _ IN _ LDO is 20V; then, the PD IC controls Q41 through Type _ C _ IN _ EN network, turns on mos Q41,20V _ Type _ IN _ VBUS outputs 20V, and supplies power to the dc-dc conversion chip of the system.

The communication process performed on the CC line between the suction end of the display and the source end of the adapter is substantially as follows:

a. and the suction end applies for obtaining the capability data of the source end.

b. The source provides its capability data information.

c. The sink selects appropriate power configuration parameters from the capability data information provided by the source and issues a corresponding request.

d. The source accepts the request and modifies the bus voltage to the corresponding parameter. The current consumption at the sink side is kept as small as possible at the bus voltage variation device. The process of raising the bus voltage by the source terminal is carried out according to the defined voltage raising speed.

e. After the bus voltage reaches the final value, the source end waits for the bus voltage to stabilize and then sends out a power supply preparation signal. At this time, the sink terminal may increase its current consumption. The same communication process occurs when the sink requires a reduced bus voltage.

When the Type C VBUS outputs 20V, the Q41 is opened after the power supply is ready. Therefore, it takes a certain time for the system to enter the power-on state.

The DC-DC conversion chips of the system work normally, and U39, U40, U41 and U42 work normally. At this time, U39 outputs 12V, U40 outputs 5V, U41 outputs 5V, and U42 outputs 3.3V.

The U40 output is 5V _ DVCC _1, and the 5V network is also output to the PD IC, powering it. The related power supply is also output to the scaler IC, so that the scaler IC enters a normal working state, and the whole display can work normally.

The input voltage of the U39, U40, U41 and U42 chips is 4.5V-30V.

The two voltages of 5V _ DVCC _1 and POW _4.5V simultaneously supply power to the PD IC. At this point, the LDO voltage input is 20V, not 5V, and the scaler IC is already operating normally. The scaler IC pulls down the Enable pin of the LDO IC through the Type _ C _ LDO _ EN, closes the LDO IC, does not use the LDO IC to supply power for the PD IC any more, but uses the 5V _ DVCC _1 of the system to supply power for the PD IC, and the system works normally.

The efficiency of an LDO IC depends on the ratio of the output voltage to the input voltage: vi is Vo, so the efficiency is very low when 20V is input and 4.57V is output. Therefore, the LDO power supply is turned off, and the 5V _ DVCC _1 of the system is used, so that the power efficiency is improved.

In the embodiments of the methods of the present invention, the sequence numbers of the steps are not used to limit the sequence of the steps, and for those skilled in the art, the sequence of the steps is not changed without creative efforts.

It should be noted that, in the present specification, all the embodiments are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the embodiments, since they are substantially similar to the product embodiments, the description is simple, and the relevant points can be referred to the partial description of the product embodiments.

Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The use of "first," "second," and similar terms in this disclosure is not intended to indicate any order, quantity, or importance, but rather is used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.

It will be understood that when an element such as a layer, film, region, or substrate is referred to as being "on" or "under" another element, it can be "directly on" or "under" the other element or intervening elements may be present.

In the foregoing description of embodiments, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only for the specific embodiments of the present disclosure, but the scope of the present disclosure is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present disclosure, and all the changes or substitutions should be covered within the scope of the present disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims.

Claims

1. A power control system for a display, comprising:

the Type-C interface is used for being connected with an external Type-C power adapter, voltage output by the Type-C power adapter is input into a power supply system through the Type-C interface, and the voltage output by the Type-C power adapter is in direct proportion to the power of the power supply system;

the main control chip is used for detecting the working mode of the display and sending the working mode to the power transmission chip, and the working mode of the display comprises the following steps: starting up, normally displaying, waiting or shutting down;

2. The power control system of claim 1, wherein the power delivery chip is specifically configured to:

when the working mode of the display is standby, the power transmission chip controls the power of the power supply system to be less than 0.5W; or

3. The power control system of claim 1, wherein the power system comprises:

a first power module comprising: a power supply for the display;

4. The power control system of claim 3, further comprising: the direct current-direct current conversion circuit comprises a direct current-direct current conversion chip, a voltage conversion circuit and a power supply system, wherein the direct current-direct current conversion chip is used for converting voltage input to the power supply system;

the DC-DC conversion chip includes:

5. The power control system of the display according to claims 2 and 4, wherein the power transfer chip is specifically configured to:

when the working mode of the display is standby, sending a first indication message to the Type-C power adapter to indicate that the output voltage of the Type-C power adapter is reduced from 20V to 9V, controlling the first direct current-direct current conversion unit to stop working, controlling the second direct current-direct current conversion unit to work normally, controlling the third direct current-direct current conversion unit to work normally, and controlling the fourth direct current-direct current conversion unit to work normally, so that the power of the power supply system is less than 0.5W; or

6. The power control system of claim 4, wherein the operating voltages of the first DC-DC converting unit, the second DC-DC converting unit, the third DC-DC converting unit and the fourth DC-DC converting unit are all 4.5V-30V.

7. The power control system of claim 4, further comprising: and the touch switch is used for providing the voltage output by the Type-C interface to the direct current-direct current conversion chip under the control of the power transmission chip.

8. The power control system of claim 7, wherein the touch switch is a field effect transistor.

9. The power control system of claim 1, wherein the power transmission chip comprises an integrated circuit bus, and the main control chip is specifically configured to detect an operating mode of the display and send the operating mode of the display to the power transmission chip through the integrated circuit bus.

10. The power control system of a display according to claim 1, further comprising:

11. The power control system of claim 10, wherein the operating voltage of the low dropout linear regulator chip is 5V.

12. The power control system of claim 1, wherein the operating voltage of the power transmission chip is 4V to 5.5V.