Display power supply circuit and display

Abstract

The application provides a display power supply circuit and a display. A mains voltage is converted into a direct current voltage by a power management circuit. A sampling control circuit is connected to a load device through at least one interface circuit to identify a charging protocol, and generates a first control signal according to the charging protocol. In this way, the power management circuit adjusts the direct current voltage to obtain a target voltage according to the first control signal, and transmits the target voltage to a switching circuit. The sampling control circuit generates a second control signal when detecting that the direct current voltage is adjusted to the target voltage, and transmits the second control signal to the switching circuit. In turn, the switching circuit can switch the charging channel according to the second control signal to transmit the target voltage to the at least one interface circuit to supply power to the load device. Therefore, the application does not need to additionally set a direct current-direct current converter to transmit the target voltage to the load device through the at least one interface circuit. Therefore, the cost of the display can be reduced.

Description

Technical Field

[0001] This application relates to the field of display technology, and in particular to a display power supply circuit and a display. Background Technology

[0002] With users increasingly using more electronic devices, such as laptops, mobile phones, and tablets, desktops often appear cluttered with numerous chargers and cables due to the need for charging. Therefore, users desire simplified desktop layouts and reduced cable clutter. Simultaneously, they want convenient connectivity and data transfer between these electronic devices. This has led to the development of monitors with external power supply capabilities.

[0003] In related technologies, displays use a built-in direct-to-direct-current (DC-DC) converter to convert the power voltage output from the charger into the voltage required by the display's USB interface, thus powering these electronic devices. However, the need for an additional DC-DC converter in these displays increases their cost. Utility Model Content

[0004] This application provides a power supply circuit and a display, which can reduce the cost of the display.

[0005] In a first aspect, this application provides a display power supply circuit, which is applied in a display, the display including: at least one interface circuit, and the display power supply circuit including: a power management circuit, a switching circuit and a sampling control circuit; The input terminal of the power management circuit is electrically connected to the mains voltage. The output terminal of the power management circuit is electrically connected to the input terminal of the switching circuit and the first input terminal of the sampling control circuit. The control terminal of the switching circuit is electrically connected to the first output terminal of the sampling control circuit. The output terminal of the switching circuit and the second input terminal of the sampling control circuit are both electrically connected to the at least one interface circuit. The at least one interface circuit is electrically connected to the load device. The second output terminal of the sampling control circuit is electrically connected to the control terminal of the power management circuit. The power management circuit is used to convert the mains voltage into DC voltage; The sampling control circuit is used to perform a handshake with the load device through the at least one interface circuit to identify the charging protocol, generate a first control signal according to the charging protocol, and transmit the first control signal to the power management circuit. The power management circuit is further configured to adjust the DC voltage according to the first control signal to obtain a target voltage, and transmit the target voltage to the switching circuit; The sampling control circuit is further configured to transmit a second control signal to the switching circuit when it detects that the DC voltage has been adjusted to the target voltage; The switching circuit is used to switch the charging channel according to the second control signal, so as to transmit the target voltage to the at least one interface circuit.

[0006] The display power supply circuit provided in the first aspect allows the power management circuit to convert AC mains voltage into DC voltage. The sampling control circuit can connect and handshake with the load device through at least one interface circuit to identify the charging protocol, generate a first control signal according to the charging protocol, and transmit the first control signal to the power management circuit, enabling the power management circuit to acquire the first control signal. Thus, the power management circuit can adjust the DC voltage according to the first control signal to obtain a target voltage, and transmit the target voltage to the switching circuit, enabling the switching circuit to acquire the target voltage. When the sampling control circuit detects that the DC voltage has been adjusted to the target voltage, it transmits a second control signal to the switching circuit, enabling the switching circuit to acquire the second control signal. Furthermore, the switching circuit can switch the charging channel according to the second control signal to transmit the target voltage to at least one interface circuit to power the load device. Therefore, this application eliminates the need for an additional DC-DC converter to transmit the target voltage to the load device through at least one interface circuit to power the load device. This reduces the cost of the display. Simultaneously, since the target voltage is directly transmitted to at least one interface circuit through the switching circuit, the heat generation of the display can be reduced.

[0007] In one possible design, the sampling control circuit includes: a sampling circuit and a protocol control circuit; The input terminal of the sampling circuit is electrically connected to the output terminal of the power management circuit, the output terminal of the sampling circuit is electrically connected to the first input terminal of the protocol control circuit, the second input terminal of the protocol control circuit is electrically connected to the at least one interface, the first output terminal of the protocol control circuit is electrically connected to the control terminal of the power management circuit, and the second output terminal of the protocol control circuit is electrically connected to the control terminal of the switching circuit. The protocol control circuit is used to communicate with the load device to determine the charging power of the at least one interface circuit, so as to generate the first control signal after a successful handshake. The sampling circuit is used to acquire the DC voltage, obtain the sampled voltage, and transmit the sampled voltage to the protocol control circuit; The protocol control circuit is further configured to detect whether the DC voltage has been adjusted to the target voltage by detecting whether the sampled voltage is greater than or equal to a preset voltage, and to transmit the second control signal to the switching circuit when the DC voltage is detected to have been adjusted to the target voltage.

[0008] In one possible design, where the at least one interface circuit includes a first interface circuit and a second interface circuit, the switching circuit includes: a first switching circuit, a second switching circuit, a third switching circuit, a fourth switching circuit, and a fifth switching circuit. The input terminal of the first switching circuit is electrically connected to the first output terminal of the power management circuit. The input terminals of the second switching circuit and the fifth switching circuit are both electrically connected to the second output terminal of the power management circuit. The input terminals of the third switching circuit and the fourth switching circuit are both electrically connected to the second output terminal of the power management circuit through the first step-down circuit in the display. The output terminals of the first, second, and third switching circuits are all electrically connected to the first interface circuit. The output terminals of the fourth and fifth switching circuits are all electrically connected to the second interface circuit. The control terminals of the first, second, third, fourth, and fifth switching circuits are all electrically connected to the second output terminal of the sampling control circuit.

[0009] In one possible design, the first interface circuit is a USB-C interface circuit, and the second interface circuit is a USB-A interface circuit.

[0010] In one possible design, the power management circuit includes: an AC-DC conversion circuit; wherein the AC-DC conversion circuit includes: an AC-DC conversion circuit with an LLC topology; The input terminal of the AC-DC conversion circuit is electrically connected to the mains voltage, and the first output terminal and the second output terminal of the AC-DC conversion circuit are both electrically connected to the input terminal of the switching circuit. The AC-DC conversion circuit is used to convert the mains voltage into a first DC voltage and a second DC voltage, respectively. The DC voltage includes: the first DC voltage and the second DC voltage. The AC-DC conversion circuit is further configured to adjust the first DC voltage according to the first control signal to obtain the target voltage, or to adjust the second DC voltage according to the first control signal to obtain the target voltage.

[0011] In one possible design, the first DC voltage is between 14V and 21V, and the second DC voltage is between 7V and 15V.

[0012] In one possible design, the first DC voltage is 20.5V, and the second DC voltage is between 7V and 15V.

[0013] In a second aspect, this application provides a display, the display comprising: at least one interface circuit and a display power supply circuit in the first aspect and various possible designs of the first aspect; The first output terminal of the display power circuit is electrically connected to the at least one interface circuit.

[0014] In one possible design, the display further includes: multiple DC-DC conversion circuits, a first buck circuit, a power management integrated circuit, a backlight control circuit, and an audio control circuit; The input terminals of the plurality of DC-DC conversion circuits, the input terminal of the power management integrated circuit, the input terminal of the first buck circuit, and the input terminal of the backlight control circuit are all electrically connected to the output terminal of the display power circuit. The output terminals of the plurality of DC-DC conversion circuits are electrically connected to the system-on-a-chip in the display. The output terminal of the power management integrated circuit is electrically connected to the display circuit in the display. The output terminal of the backlight control circuit is electrically connected to the backlight in the display. The input terminal of the audio control circuit is electrically connected to the output terminal of the first buck circuit.

[0015] In one possible design, the display further includes: a first buck circuit, a second buck circuit, multiple DC-DC conversion circuits, a power management integrated circuit, a backlight control circuit, and an audio control circuit; The input terminals of the first step-down circuit, the second step-down circuit, and the backlight control circuit are all electrically connected to the output terminal of the display power circuit. The output terminal of the second step-down circuit is electrically connected to the input terminals of the plurality of DC-DC conversion circuits and the input terminal of the power management integrated circuit. The output terminals of the plurality of DC-DC conversion circuits are electrically connected to the system-on-a-chip in the display. The output terminal of the power management integrated circuit is electrically connected to the display circuit in the display. The output terminal of the backlight control circuit is electrically connected to the backlight in the display. The input terminal of the audio control circuit is electrically connected to the output terminal of the first step-down circuit.

[0016] The beneficial effects of the display provided in the second aspect and the various possible designs of the second aspect can be found in the first aspect and the various possible implementations of the first aspect, and will not be repeated here.

[0017] The above description is merely an overview of the technical solutions of the embodiments of this application. In order to better understand the technical means of the embodiments of this application and to implement them in accordance with the contents of the specification, and to make the above and other objects, features and advantages of the embodiments of this application more obvious and understandable, specific implementation methods of this application are described below. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of a display in related technologies; Figure 2 This is a schematic diagram of the structure of a display provided in an embodiment of this application; Figure 3 This is a schematic diagram of another display structure provided in an embodiment of this application; Figure 4 This is a schematic diagram of the structure of another display provided in an embodiment of this application. Detailed Implementation

[0020] In this application, "at least one" means one or more, and "more than one" means two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A alone, A and B simultaneously, or B alone, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, or c alone can mean: a alone, b alone, c alone, a combination of a and b, a combination of a and c, a combination of b and c, or a, b, and c, where a, b, and c can be single or multiple. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0021] The terms "connected" and "connected" should be interpreted broadly. For example, in circuit structures, "connected" or "connected" can refer not only to physical connections but also to electrical or signal connections. This could be a direct connection (physical connection) or an indirect connection via at least one intermediate component, as long as the circuit is connected. It could also refer to the internal connection between two components. Similarly, a signal connection can refer to a connection via a circuit or a medium, such as radio waves. Those skilled in the art will understand the specific meaning of these terms in this application based on the specific circumstances.

[0022] Reference Figure 1 , Figure 1 This is a schematic diagram of the structure of a display in related technologies. For example... Figure 1 As shown, the display in the related technology may include a DC-DC converter and a USB-C interface. The DC-DC converter can convert the power supply voltage output from the charger into the voltage required by the USB-C interface to power electronic devices electrically connected to the USB-C interface.

[0023] For example, if the power supply voltage is 19V, the DC-DC converter can convert the 19V power supply voltage into a DC voltage between 5V and 20V to power electronic devices.

[0024] However, the cost of the display is high because the display in the relevant technology requires an additional DC-DC converter.

[0025] To address the aforementioned problems, this application provides a power supply circuit for a display and a display.

[0026] Reference Figure 2 , Figure 2 This is a schematic diagram of the structure of a display provided in an embodiment of this application, such as... Figure 2 As shown, the display power supply circuit 100 is used in the display 1000, which may include at least one interface circuit 200. The display power supply circuit 100 may include a power management circuit 110, a switching circuit 120, and a sampling control circuit 130.

[0027] The input terminal of the power management circuit 110 is electrically connected to the mains voltage. The output terminal of the power management circuit 110 is electrically connected to the input terminal of the switching circuit 120 and the first input terminal of the sampling control circuit 130. The control terminal of the switching circuit 120 is electrically connected to the first output terminal of the sampling control circuit 130. The output terminal of the switching circuit 120 and the second input terminal of the sampling control circuit 130 are both electrically connected to at least one interface circuit 200. At least one interface circuit 200 is electrically connected to the load device. The second output terminal of the sampling control circuit 130 is electrically connected to the control terminal of the power management circuit 110.

[0028] The power management circuit 110, the switching circuit 120, and the sampling control circuit 130 can be integrated or set separately, depending on actual needs. This application does not impose specific limitations on this.

[0029] The power management circuit 110 can convert the mains voltage into DC voltage VD.

[0030] The mains voltage is, for example, an AC voltage of 110V-220V.

[0031] The sampling control circuit 130 can connect and handshake with the load device through at least one interface circuit 200 to identify the charging protocol. Furthermore, the sampling control circuit 130 can generate a first control signal according to the charging protocol and transmit the first control signal to the power management circuit 110, enabling the power management circuit 110 to acquire the first control signal.

[0032] Among them, load devices include, for example, tablets, laptops, and mobile phones.

[0033] The charging protocols may include: USB power delivery (PD), USB programmable power supply (PPS), and USB standard charging protocol.

[0034] Thus, the power management circuit 110 can adjust the DC voltage VD according to the first control signal to obtain the target voltage V-BUS. Furthermore, the power management circuit 110 can transmit the target voltage V-BUS to the switching circuit 120, enabling the switching circuit 120 to acquire the target voltage V-BUS.

[0035] In this way, when the sampling control circuit 130 detects that the DC voltage VD has been adjusted to the target voltage V-BUS, it can transmit the second control signal to the switching circuit 120, so that the switching circuit 120 can acquire the second control signal.

[0036] Furthermore, the switching circuit 120 can switch the charging channel according to the second control signal to transmit the target voltage V-BUS to at least one interface circuit 200 so that the load device can be charged.

[0037] The charging channels may include: a first charging channel with a charging voltage of 5V, a second charging channel with a charging voltage of, for example, 7V or 9V, and a third charging channel with a charging voltage of 15V or 20V. The second charging channel is a medium-voltage fast charging channel, and the third charging channel is a high-voltage fast charging channel.

[0038] Specifically, when the charging protocol is USB PD, the switching circuit 120 can switch the charging channel from the first charging channel to the second charging channel according to the second control signal. When the charging protocol is USB PPS, the switching circuit 120 can switch the first charging channel to the third charging channel according to the second control signal.

[0039] Therefore, this application eliminates the need for an additional DC-DC converter to transmit the target voltage V-BUS to the load device via at least one interface circuit 200 to power the load device. This reduces the cost of the display.

[0040] Furthermore, since the target voltage V-BUS is directly transmitted to at least one interface circuit 200 via the switching circuit 120, the heat generated by the display can be reduced.

[0041] The display power supply circuit provided in this application can convert AC mains voltage to DC voltage through a power management circuit. A sampling control circuit can connect and handshake with the load device through at least one interface circuit to identify the charging protocol, and generate a first control signal according to the charging protocol. This first control signal is then transmitted to the power management circuit, allowing the power management circuit to acquire the first control signal. The power management circuit can then adjust the DC voltage according to the first control signal to obtain a target voltage, and transmit the target voltage to a switching circuit, allowing the switching circuit to acquire the target voltage. When the sampling control circuit detects that the DC voltage has been adjusted to the target voltage, it transmits a second control signal to the switching circuit, allowing the switching circuit to acquire the second control signal. Furthermore, the switching circuit can switch the charging channel according to the second control signal to transmit the target voltage to at least one interface circuit to power the load device. Therefore, this application eliminates the need for an additional DC-DC converter to transmit the target voltage to the load device through at least one interface circuit, thereby reducing the cost of the display. Simultaneously, since the target voltage is directly transmitted to at least one interface circuit through the switching circuit, the heat generation of the display can be reduced.

[0042] Based on the description of the above embodiments, an exemplary possible implementation of the sampling control circuit 130 is provided. For example... Figure 2 As shown, the sampling control circuit 130 may include a sampling circuit 132 and a protocol control circuit 131.

[0043] The input terminal of the sampling circuit 132 is electrically connected to the output terminal of the power management circuit 110. The output terminal of the sampling circuit 132 is electrically connected to the first input terminal of the protocol control circuit 131. The second input terminal of the protocol control circuit 131 is electrically connected to at least one interface. The first output terminal of the protocol control circuit 131 is electrically connected to the control terminal of the power management circuit 110. The second output terminal of the protocol control circuit 131 is electrically connected to the control terminal of the switching circuit 120.

[0044] Wherein, the input terminal of the sampling circuit 132 is the first input terminal of the sampling control circuit 130, the second input terminal of the protocol control circuit 131 is the second input terminal of the sampling control circuit 130, the second output terminal of the protocol control circuit 131 is the first output terminal of the sampling control circuit 130, and the first output terminal of the protocol control circuit 131 is the second output terminal of the sampling control circuit 130.

[0045] In practical applications, the first output terminal of the protocol control circuit 131 is typically electrically connected to the control terminal of the power management circuit 110 via a conversion circuit. The conversion circuit can be, for example, an optocoupler.

[0046] The protocol control circuit 131 can communicate with the load device to determine the charging power of at least one interface circuit 200, so as to generate a first control signal after a successful handshake, enabling the sampling control circuit 130 to generate the first control signal.

[0047] The sampling circuit 132 can acquire the DC voltage VD to obtain the sampled voltage. Furthermore, the sampling circuit 132 can transmit the sampled voltage to the protocol control circuit 131, enabling the protocol control circuit 131 to acquire the sampled voltage.

[0048] In this way, the protocol control circuit 131 can detect whether the DC voltage VD has been adjusted to the target voltage V-BUS by detecting whether the sampled voltage is greater than or equal to the preset voltage. Furthermore, when the protocol control circuit 131 detects that the DC voltage VD has been adjusted to the target voltage V-BUS, it can transmit a second control signal to the switching circuit 120, so that the sampling control circuit 130 can transmit the second control signal to the switching circuit 120.

[0049] Specifically, when the protocol control circuit 131 detects that the sampled voltage is greater than or equal to the preset voltage, the protocol control circuit 131 can detect that the DC voltage VD is adjusted to the target voltage V-BUS. When the protocol control circuit 131 detects that the sampled voltage is less than the preset voltage, the protocol control circuit 131 can detect that the DC voltage VD has been adjusted but not adjusted to the target voltage V-BUS. In this case, the adjusted DC voltage VD is less than the target voltage V-BUS.

[0050] Based on the description of the above embodiments, an exemplary possible implementation of at least one interface circuit 200 is provided. Figure 2 As shown, when at least one interface circuit 200 includes a first interface circuit 210 and a second interface circuit 220, the switch circuit 120 may include: a first switch circuit 121, a second switch circuit 122, a third switch circuit 123, a fourth switch circuit 124 and a fifth switch circuit 125.

[0051] The input terminal of the first switching circuit 121 is electrically connected to the first output terminal of the power management circuit 110. The input terminals of the second switching circuit 122 and the fifth switching circuit 125 are both electrically connected to the second output terminal of the power management circuit 110. The input terminals of the third switching circuit 123 and the fourth switching circuit 124 are both electrically connected to the second output terminal of the power management circuit 110 through the first step-down circuit 112 in the display 1000. The output terminals of the first switching circuit 121, the second switching circuit 122, and the third switching circuit 123 are all electrically connected to the first interface circuit. The output terminals of the fourth switching circuit 124 and the fifth switching circuit 125 are all electrically connected to the second interface circuit 220. The control terminals of the first switching circuit 121, the second switching circuit 122, the third switching circuit 123, the fourth switching circuit 124, and the fifth switching circuit 125 are all electrically connected to the second output terminal of the sampling control circuit 130.

[0052] Wherein, the input terminals of the first switch circuit 121, the second switch circuit 122, and the fifth switch circuit 125 are all input terminals of the switch circuit 120; the output terminals of the first switch circuit 121, the second switch circuit 122, the third switch circuit 123, the fourth switch circuit 124, and the fifth switch circuit 125 are all output terminals of the switch circuit 120; and the control terminals of the first switch circuit 121, the second switch circuit 122, the third switch circuit 123, the fourth switch circuit 124, and the fifth switch circuit 125 are all control terminals of the switch circuit 120.

[0053] The second switching circuit 122, the third switching circuit 123, the sampling circuit 132, and the protocol control circuit 131 can be integrated into the same chip.

[0054] The initial states of the third switch circuit 123 and the fourth switch circuit 124 are in the ON state, while the initial states of the first switch circuit 121, the second switch circuit 122 and the fifth switch circuit 125 are in the OFF state.

[0055] Specifically, when the first switching circuit 121 is turned on according to the second control signal, the third charging channel is turned on, allowing the switching circuit 120 to switch the first charging channel to the third charging channel according to the second control signal. When the second switching circuit 122 is turned on according to the second control signal, the second charging channel is turned on, allowing the switching circuit 120 to switch the charging channel from the first charging channel to the second charging channel according to the second control signal. When the fifth switching circuit 125 is turned on according to the second control signal, the second charging channel is turned on, allowing the switching circuit 120 to switch the charging channel from the first charging channel to the second charging channel according to the second control signal.

[0056] In some examples, the first interface circuit 210 is a USB-C interface circuit, and the second interface circuit 220 is a USB-A interface circuit.

[0057] Based on the description of the above embodiments, an exemplary possible implementation of the power management circuit 110 is provided. For example... Figure 2 As shown, the power management circuit 110 may include an AC-DC conversion circuit 111.

[0058] Among them, the AC-DC conversion circuit 111 includes: an AC-DC conversion circuit with an LLC topology.

[0059] The input terminal of the AC-DC converter circuit 111 is electrically connected to the mains voltage, and the first output terminal and the second output terminal of the AC-DC converter circuit 111 are both electrically connected to the input terminal of the switch circuit 120.

[0060] The input terminal of the AC-DC conversion circuit 111 is the input terminal of the power management circuit 110, and the first output terminal and the second output terminal of the AC-DC conversion circuit 111 are both output terminals of the power management circuit 110.

[0061] The AC-DC converter circuit 111 can convert the mains voltage into a first DC voltage VD1 and a second DC voltage VD2, respectively.

[0062] Thus, the power management circuit 110 can convert the mains voltage into a DC voltage VD.

[0063] The DC voltage VD may include: a first DC voltage VD1 and a second DC voltage VD2.

[0064] In some examples, the first DC voltage VD1 is between 14V and 21V, and the second DC voltage VD2 is between 7V and 15V.

[0065] The first DC voltage VD1 can fast charge load devices such as laptops. The first DC voltage VD1 can also fast charge mobile phones with an input-to-output voltage ratio of 4:2 or 4:1. The second DC voltage VD2 can fast charge mobile phones with an input-to-output voltage ratio of 2:1.

[0066] In some examples, the first DC voltage VD1 is 20.5V, and the second DC voltage VD2 is between 7V and 15V.

[0067] The first DC voltage VD1 can fast charge a load device such as a laptop. The second DC voltage VD2 can fast charge a mobile phone.

[0068] Meanwhile, when the first interface circuit 210 is connected to the load device, the AC-DC conversion circuit 111 can adjust the first DC voltage VD1 according to the first control signal to obtain the target voltage V-BUS. Alternatively, when the second interface circuit 220 is connected to the load device, the AC-DC conversion circuit 111 can adjust the second DC voltage VD2 according to the first control signal to obtain the target voltage V-BUS.

[0069] Therefore, the power management circuit 110 can adjust the DC voltage VD according to the first control signal to obtain the target voltage V-BUS.

[0070] This application also provides a display 1000, such as... Figure 2 As shown, the display 1000 may include at least one interface circuit 200 and a display power supply circuit 100.

[0071] The first output terminal of the display power circuit 100 is electrically connected to at least one interface circuit 200.

[0072] The output terminal of the switch circuit 120 is the first output terminal of the display power supply circuit 100.

[0073] Based on the description of the above embodiments, an exemplary possible implementation of the display 1000 is provided. (Refer to...) Figure 3 , Figure 3 This is a schematic diagram of another display structure provided in an embodiment of this application. Figure 2 and Figure 3 As shown, the display 1000 may also include: multiple DC-DC conversion circuits 300, a first step-down circuit 112, a power management integrated circuit 400, a backlight control circuit 500, and an audio control circuit 600.

[0074] The input terminals of multiple DC-DC conversion circuits 300, the input terminal of the power management integrated circuit 400, the input terminal of the first step-down circuit 112, and the input terminal of the backlight control circuit 500 are all electrically connected to the output terminal of the display power circuit 100. The output terminals of the multiple DC-DC conversion circuits 300 are electrically connected to the system-on-a-chip in the display 1000. The output terminal of the power management integrated circuit 400 is electrically connected to the display circuit in the display 1000. The output terminal of the backlight control circuit 500 is electrically connected to the backlight in the display 1000. The input terminal of the audio control circuit 600 is electrically connected to the output terminal of the first step-down circuit 112.

[0075] The backlight is also electrically connected to the display circuit. The backlight is, for example, a light-emitting diode (LED).

[0076] in, Figure 2 The first input terminal and the second input terminal of the power management integrated circuit 400 are both electrically connected to the second output terminal of the power management circuit 110.

[0077] in, Figure 3 The first input terminal of the power management integrated circuit 400 is electrically connected to the second output terminal of the power management circuit 110, and the second input terminal of the power management integrated circuit 400 is electrically connected to the first output terminal of the power management circuit 110 through a transistor.

[0078] Based on the description of the above embodiments, another possible implementation of the display 1000 is provided, by way of example. (Refer to...) Figure 4 , Figure 4 This is a schematic diagram of the structure of another display provided in an embodiment of this application. For example... Figure 4 As shown, the display 1000 may further include: a first step-down circuit 112, a second step-down circuit 700, multiple DC-DC conversion circuits 300, a power management integrated circuit 400, a backlight control circuit 500, and an audio control circuit 600.

[0079] The input terminals of the first step-down circuit 112, the second step-down circuit 700, and the backlight control circuit 500 are all electrically connected to the output terminal of the display power circuit 100. The output terminal of the second step-down circuit 700 is electrically connected to the input terminals of multiple DC-DC conversion circuits 300 and the input terminal of the power management integrated circuit 400, respectively. The output terminals of the multiple DC-DC conversion circuits 300 are electrically connected to the system-on-a-chip in the display 1000. The output terminal of the power management integrated circuit 400 is electrically connected to the display circuit in the display 1000. The output terminal of the backlight control circuit 500 is electrically connected to the backlight lamp in the display 1000. The input terminal of the audio control circuit 600 is electrically connected to the output terminal of the first step-down circuit 112.

[0080] The backlight is also electrically connected to the display circuit.

[0081] In some examples, such as Figures 2-4 As shown, the multiple DC-DC conversion circuits 300 may include: a first DC-DC conversion circuit DCDC1, a second DC-DC conversion circuit DCDC2, and a third DC-DC conversion circuit DCDC3.

[0082] The output terminals of the first DC-DC converter circuit DCDC1, the second DC-DC converter circuit DCDC2, and the third DC-DC converter circuit DCDC3 are all electrically connected to the on-chip system in the display 1000.

[0083] The output of the first DC-DC converter circuit DCDC1 is used to output a first voltage of, for example, 3.3V; the output of the second DC-DC converter circuit DCDC2 is used to output a second voltage of, for example, 1.8V; and the output of the third DC-DC converter circuit DCDC3 is used to output a third voltage of, for example, 1.2V.

[0084] The display provided in this application embodiment has the same beneficial effects as the display power supply circuit provided in this application embodiment, and will not be described again here.

[0085] Finally, it should be noted that the above embodiments are merely specific implementations of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions within the technical scope disclosed in this application should be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A power supply circuit for a display, characterized in that, The power supply circuit for the display is used in the display, which includes at least one interface circuit and includes a power management circuit, a switching circuit, and a sampling control circuit. The input terminal of the power management circuit is electrically connected to the mains voltage. The output terminal of the power management circuit is electrically connected to the input terminal of the switching circuit and the first input terminal of the sampling control circuit. The control terminal of the switching circuit is electrically connected to the first output terminal of the sampling control circuit. The output terminal of the switching circuit and the second input terminal of the sampling control circuit are both electrically connected to the at least one interface circuit. The at least one interface circuit is electrically connected to the load device. The second output terminal of the sampling control circuit is electrically connected to the control terminal of the power management circuit. The power management circuit is used to convert the mains voltage into DC voltage; The sampling control circuit is used to perform a handshake with the load device through the at least one interface circuit to identify the charging protocol, generate a first control signal according to the charging protocol, and transmit the first control signal to the power management circuit. The power management circuit is further configured to adjust the DC voltage according to the first control signal to obtain a target voltage, and transmit the target voltage to the switching circuit; The sampling control circuit is also used to transmit a second control signal to the switching circuit when it detects that the DC voltage has been adjusted to the target voltage; The switching circuit is used to switch the charging channel according to the second control signal, so as to transmit the target voltage to the at least one interface circuit.

2. The circuit according to claim 1, characterized in that, The sampling control circuit includes: a sampling circuit and a protocol control circuit; The input terminal of the sampling circuit is electrically connected to the output terminal of the power management circuit, the output terminal of the sampling circuit is electrically connected to the first input terminal of the protocol control circuit, the second input terminal of the protocol control circuit is electrically connected to the at least one interface, the first output terminal of the protocol control circuit is electrically connected to the control terminal of the power management circuit, and the second output terminal of the protocol control circuit is electrically connected to the control terminal of the switching circuit. The protocol control circuit is used to communicate with the load device to determine the charging power of the at least one interface circuit, so as to generate the first control signal after a successful handshake. The sampling circuit is used to acquire the DC voltage, obtain the sampled voltage, and transmit the sampled voltage to the protocol control circuit; The protocol control circuit is further configured to detect whether the DC voltage has been adjusted to the target voltage by detecting whether the sampled voltage is greater than or equal to a preset voltage, and to transmit the second control signal to the switching circuit when the DC voltage is detected to have been adjusted to the target voltage.

3. The circuit according to claim 2, characterized in that, When the at least one interface circuit includes a first interface circuit and a second interface circuit, the switching circuit includes: a first switching circuit, a second switching circuit, a third switching circuit, a fourth switching circuit, and a fifth switching circuit. The input terminal of the first switching circuit is electrically connected to the first output terminal of the power management circuit. The input terminals of the second switching circuit and the fifth switching circuit are both electrically connected to the second output terminal of the power management circuit. The input terminals of the third switching circuit and the fourth switching circuit are both electrically connected to the second output terminal of the power management circuit through the first step-down circuit in the display. The output terminals of the first, second, and third switching circuits are all electrically connected to the first interface circuit. The output terminals of the fourth and fifth switching circuits are all electrically connected to the second interface circuit. The control terminals of the first, second, third, fourth, and fifth switching circuits are all electrically connected to the second output terminal of the sampling control circuit.

4. The circuit according to claim 3, characterized in that, The first interface circuit is a USB-C interface circuit, and the second interface circuit is a USB-A interface circuit.

5. The circuit according to any one of claims 1-4, characterized in that, The power management circuit includes: an AC-DC conversion circuit; wherein, the AC-DC conversion circuit includes: an AC-DC conversion circuit with an LLC topology; The input terminal of the AC-DC conversion circuit is electrically connected to the mains voltage, and both the first output terminal and the second output terminal of the AC-DC conversion circuit are electrically connected to the input terminal of the switching circuit. The AC-DC conversion circuit is used to convert the mains voltage into a first DC voltage and a second DC voltage, respectively, wherein the DC voltage includes the first DC voltage and the second DC voltage. The AC-DC conversion circuit is further configured to adjust the first DC voltage according to the first control signal to obtain the target voltage, or to adjust the second DC voltage according to the first control signal to obtain the target voltage.

6. The circuit according to claim 5, characterized in that, The first DC voltage is between 14V and 21V, and the second DC voltage is between 7V and 15V.

7. The circuit according to claim 5, characterized in that, The first DC voltage is 20.5V, and the second DC voltage is between 7V and 15V.

8. A display, characterized in that, The display includes: at least one interface circuit and a display power supply circuit as described in any one of claims 1-7; The first output terminal of the display power circuit is electrically connected to the at least one interface circuit.

9. The display according to claim 8, characterized in that, The display also includes: multiple DC-DC conversion circuits, a first buck circuit, a power management integrated circuit, a backlight control circuit, and an audio control circuit; The input terminals of the plurality of DC-DC conversion circuits, the input terminal of the power management integrated circuit, the input terminal of the first buck circuit, and the input terminal of the backlight control circuit are all electrically connected to the output terminal of the display power circuit. The output terminals of the plurality of DC-DC conversion circuits are electrically connected to the system-on-a-chip in the display. The output terminal of the power management integrated circuit is electrically connected to the display circuit in the display. The output terminal of the backlight control circuit is electrically connected to the backlight in the display. The input terminal of the audio control circuit is electrically connected to the output terminal of the first buck circuit.

10. The display according to claim 8, characterized in that, The display also includes: a first step-down circuit, a second step-down circuit, multiple DC-DC conversion circuits, a power management integrated circuit, a backlight control circuit, and an audio control circuit; The input terminals of the first step-down circuit, the second step-down circuit, and the backlight control circuit are all electrically connected to the output terminal of the display power circuit. The output terminal of the second step-down circuit is electrically connected to the input terminals of the plurality of DC-DC conversion circuits and the input terminal of the power management integrated circuit. The output terminals of the plurality of DC-DC conversion circuits are electrically connected to the system-on-a-chip in the display. The output terminal of the power management integrated circuit is electrically connected to the display circuit in the display. The output terminal of the backlight control circuit is electrically connected to the backlight in the display. The input terminal of the audio control circuit is electrically connected to the output terminal of the first step-down circuit.

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