Power supply circuit and display device using same

Abstract

The embodiment of the invention provides a power supply circuit and display equipment applying the same. The power supply circuit comprises an adapter input interface, an energy storage circuit, a voltage conversion circuit and a voltage stabilizing circuit, and the voltage conversion circuit and the voltage stabilizing circuit are respectively coupled with a standby circuit of the display equipment. The voltage conversion circuit is coupled with the adapter input interface, and can convert a first electric signal provided by the power adapter into a third electric signal through the voltage conversion circuit when the display device is connected to the power adapter and enters a standby state, and supply power to the to-be-powered circuit. The voltage stabilizing circuit is coupled with the energy storage circuit, and can convert a second electric signal provided by the energy storage circuit into a fourth electric signal through the voltage stabilizing circuit when the display device is not connected to the power adapter and enters a standby state, and supply power to the circuit to be powered. The voltage of the fourth electric signal is the first voltage of the third electric signal, the standby power can be reduced, the standby power supply duration of the energy storage circuit is prolonged, and the risk of over-discharge is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of electronic circuits, and in particular to a power supply circuit and a display device using the same. Background Art

[0002] In recent years, with the development of laser projection display technology, projection devices such as laser TVs, laser micro-projectors, and art TVs have gradually become part of people's work and daily lives. Because projection devices are portable and easy to carry, users can easily move their devices to other projection spaces, such as changing conference rooms or movie theaters, to continue projecting. This provides significant convenience.

[0003] Power consumption is a key performance metric for all types of display devices, including projection equipment. In addition to the device's power consumption during normal operation, the device's power consumption during standby mode also impacts the user experience. For example, when powered by an energy storage device, even when the display device is switched to standby mode, it continues to consume energy from the device, potentially leading to over-discharge of the device due to prolonged standby.

[0004] Therefore, it is necessary to provide a standby power supply solution for the display device to reduce its standby power consumption as much as possible. Summary of the Invention

[0005] Some embodiments of the present application provide a power supply circuit and a display device using the same, which can reduce standby power consumption.

[0006] Some embodiments of the present application provide a power supply circuit, applied to a display device, comprising:

[0007] The adapter input interface is configured to receive a first electrical signal input by a power adapter;

[0008] a tank circuit configured to output a second electrical signal;

[0009] a battery management circuit coupled to the energy storage circuit and configured to control the energy storage circuit to output the second electrical signal when the adapter input interface is not connected to the power adapter;

[0010] a voltage conversion circuit, coupled to the adapter input interface, the energy storage circuit, and the standby circuit of the display device, respectively, and configured to convert the first electrical signal or the second electrical signal into a third electrical signal to power the standby circuit via the third electrical signal;

[0011] Wherein, the power supply circuit further includes:

[0012] A voltage stabilizing circuit is coupled to the energy storage circuit and the standby circuit respectively, and is configured to convert the second electrical signal into a fourth electrical signal to power the standby circuit through the fourth electrical signal; wherein the voltage of the fourth electrical signal is less than the voltage of the third electrical signal.

[0013] In the above embodiment, based on the voltage stabilizing circuit, when no power adapter is connected to the adapter input interface and the display device is in standby mode, the energy storage circuit can supply power to the standby circuit via the voltage stabilizing circuit. Compared to supplying power to the standby circuit using the third electrical signal converted by the voltage conversion circuit, the voltage stabilizing circuit can output a fourth electrical signal having a lower voltage. While still meeting the power supply requirements of the standby circuit, this reduces the standby power, thereby slowing down the discharge rate of the energy storage circuit in the standby state, extending the standby time, and reducing the risk of over-discharge of the energy storage circuit.

[0014] In some embodiments, the battery management circuit is further coupled to the voltage conversion circuit;

[0015] The battery management circuit is further configured to:

[0016] When the adapter input interface is not connected to the power adapter and a standby signal is received, the voltage conversion circuit is turned off to cut off the power supply path from the energy storage circuit to the standby circuit through the voltage conversion circuit.

[0017] In the above embodiment, by configuring the control logic of the battery management circuit, it can not only control the charging and discharging of the energy storage circuit, but also enable or disable the voltage conversion circuit according to information such as whether the power adapter is connected and whether the display device is in standby mode, thereby ensuring that when the display device is working normally, the third electrical signal can be output by the voltage conversion circuit to power low-voltage load circuits such as the main control chip. When the display device is in standby mode, the output of the third electrical signal of the voltage conversion circuit can be interrupted, so that the fourth electrical signal with a lower voltage can be output by the voltage stabilizing circuit to power the standby circuit, thereby reducing the standby power, extending the standby time of the energy storage circuit, and reducing the risk of over-discharge of the energy storage circuit.

[0018] In some embodiments, the voltage conversion circuit includes a step-down circuit;

[0019] The battery management circuit is further configured to:

[0020] When the adapter input interface is not connected to the power adapter and the standby signal is received, the energy storage circuit is controlled to adjust the voltage of the second electrical signal so that the voltage of the second electrical signal is less than the preset input voltage of the step-down circuit, thereby turning off the step-down circuit.

[0021] In the above embodiment, when the voltage conversion circuit is a step-down circuit, the battery management circuit can indirectly control the state of the voltage conversion circuit by controlling the voltage of the second electrical signal output by the energy storage circuit. As a result, no additional communication is required between the battery management circuit and the voltage conversion circuit. When the energy storage circuit is powered and the display device is in standby mode, the voltage conversion circuit can be turned off and the output of the third electrical signal can be stopped by reducing the voltage of the second electrical signal. As a result, a fourth electrical signal with a lower voltage can be output through the voltage stabilizing circuit to power the standby circuit, thereby reducing the standby power, extending the standby time of the energy storage circuit, and reducing the risk of over-discharge of the energy storage circuit.

[0022] In some embodiments, the battery management circuit is further configured to:

[0023] When the adapter input interface is not connected to the power adapter and the standby signal is received, a shutdown control signal is sent to the voltage conversion circuit to shut down the step-down conversion circuit.

[0024] In the above embodiment, the battery management circuit directly controls the state of the voltage conversion circuit by sending an enable control signal to the voltage conversion circuit, so that when the energy storage circuit is powered and the display device is in standby mode, the voltage conversion circuit can be turned off and the output of the third electrical signal can be stopped. Therefore, a fourth electrical signal with a lower voltage can be output through the voltage stabilizing circuit to power the standby circuit, reduce the standby power, extend the standby time of the energy storage circuit, and reduce the risk of over-discharge of the energy storage circuit.

[0025] In some embodiments, the voltage stabilization circuit includes:

[0026] an operating voltage receiving terminal configured to receive an operating voltage signal;

[0027] a power supply output terminal, coupled to the standby circuit, and configured to output the fourth electrical signal to the standby circuit;

[0028] a standby signal receiving end, configured to receive a standby signal;

[0029] The voltage stabilizing circuit is configured such that, when the standby signal receiving end receives the standby signal, the working voltage receiving end and the power supply output end are electrically connected, so that the working voltage signal is converted into the fourth electrical signal and output.

[0030] In the above embodiment, the voltage stabilizing circuit of the power supply circuit has a standby signal receiving end, so that the standby signal can be used to control whether the voltage stabilizing circuit outputs the fourth electrical signal. When the display device is on standby, the voltage stabilizing circuit can be controlled to supply power to the standby circuit, thereby reducing standby power.

[0031] In some embodiments, the power supply circuit further comprises: a power-on switch circuit;

[0032] The power-on switch circuit comprises:

[0033] a power-on input terminal coupled to the energy storage circuit and configured to receive the second electrical signal;

[0034] a power-on output terminal, coupled to the operating voltage receiving terminal of the voltage stabilizing circuit, and configured to output the operating voltage signal;

[0035] A detection signal receiving end is configured to receive an access detection signal; the access detection signal is a signal indicating that the power adapter is connected to the adapter input interface;

[0036] The power-on switch circuit is configured to, when the detection signal receiving end does not receive the access detection signal, conduct the power-on input end and the power-on output end, so that the second electrical signal is converted into the working voltage signal and output.

[0037] In the above embodiment, the detection signal receiving end of the power-on switch circuit does not receive the access detection signal, indicating that the adapter input interface is not connected to the power adapter, that is, the display device needs to be powered by the energy storage circuit. Therefore, the power-on switch circuit conducts between its power-on input end and the power-on output end, so that the second electrical signal output by the energy storage circuit can be converted into an operating voltage signal and output to the operating voltage receiving end of the voltage stabilizing circuit, so that the voltage stabilizing circuit can be powered on. In other words, when the display device is on standby, the voltage stabilizing circuit can output a fourth electrical signal with a lower voltage to power the standby circuit, thereby reducing the standby power, reducing the discharge speed of the energy storage circuit, and extending the standby time of the display device when powered by the energy storage circuit.

[0038] In some embodiments, the voltage stabilization circuit includes:

[0039] a first switch; a first end of the first switch is coupled to the working voltage receiving end, and a second end of the first switch is coupled to the power supply output end;

[0040] a first zener diode; a cathode of the first zener diode coupled to the control terminal of the first switch, a cathode of the first zener diode further coupled to the working voltage receiving terminal via a first resistor, and an anode of the first zener diode grounded;

[0041] a second switch; a first end of the second switch is coupled to the cathode of the first voltage-regulating diode, a second end of the second switch is coupled to the anode of the first voltage-regulating diode, and a control end of the second switch is coupled to the standby signal receiving end.

[0042] In the above embodiment, by setting the first switch, the second switch and the first voltage stabilizing diode in the voltage stabilizing circuit, not only can it be achieved to control whether to power the standby circuit according to the standby signal, but it can also ensure that a stable power supply voltage is provided when the standby circuit is powered, thereby reducing the standby power.

[0043] In some embodiments, the power-on switch circuit includes:

[0044] a third switch; a first terminal of the third switch is coupled to the power-on input terminal, and a second terminal of the third switch is coupled to the power-on output terminal;

[0045] a second zener diode; a cathode of the second zener diode coupled to the control terminal of the third switch, a cathode of the second zener diode further coupled to the power-on input terminal via a second resistor, and an anode of the second zener diode grounded;

[0046] a fourth switch; a first end of the fourth switch is also coupled to the cathode of the second voltage regulator diode, a second end of the fourth switch is coupled to the anode of the second voltage regulator diode, and a control end of the fourth switch is coupled to the detection signal receiving end.

[0047] In the above embodiment, by providing a third switch, a fourth switch, and a second voltage stabilizing diode in the power-on switch circuit, it is possible not only to control whether to power the voltage stabilizing circuit through the energy storage circuit according to whether the power adapter is connected, but also to ensure that a stable power supply voltage is provided when powering the voltage stabilizing circuit.

[0048] In some embodiments, the power-on output terminal of the power-on switch circuit is further coupled to the battery management circuit to control the power-on operation of the battery management circuit through the operating voltage signal.

[0049] In the above embodiment, the power-on output end of the power-on switch circuit is coupled to the battery management circuit so that the power-on operation of the battery management circuit can be controlled by the working voltage signal output by the power-on switch circuit. This means that the battery management circuit 21 is controlled to be powered on when and only when the power adapter is not connected and needs to be powered by the energy storage circuit, thereby avoiding energy waste in the energy storage circuit.

[0050] In some embodiments, the power supply circuit further comprises: an access detection circuit;

[0051] The access detection circuit includes:

[0052] a first voltage-dividing resistor; a first end of the first voltage-dividing resistor is coupled to the adapter input interface;

[0053] a second voltage-dividing resistor; a first end of the second voltage-dividing resistor is coupled to the second end of the first voltage-dividing resistor, and a second end of the second voltage-dividing resistor is grounded;

[0054] The first end of the second voltage-dividing resistor serves as a signal output end of the access detection circuit, and the voltage signal at the first end of the second voltage-dividing resistor serves as the access detection signal.

[0055] In the above embodiment, when the power adapter is not connected, the first end of the second voltage-divider resistor is effectively grounded, resulting in a low-level connection detection signal. When the power adapter is connected, the first and second voltage-divider resistors divide the first electrical signal input from the power adapter, resulting in a high-level connection detection signal output from the first end of the second voltage-divider resistor. Therefore, whether the power adapter is connected can be determined based on the level of the connection detection signal output by the connection detection circuit.

[0056] Some embodiments of the present application further provide a display device, which includes the power supply circuit described in any of the above embodiments.

[0057] In this embodiment, the display device can be a projection device, a liquid crystal display device, etc.; for any type of display device, it can be powered by the power supply circuit provided by any of the above embodiments, thereby reducing the standby power while meeting the power supply requirements of the standby circuit, thereby reducing the discharge speed of the energy storage circuit in the standby state, extending the standby time, and reducing the risk of over-discharge of the energy storage circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] In order to more clearly illustrate the implementation methods of some embodiments of the present application or related technologies, the following is a brief introduction to the drawings required for use in the description of the embodiments or related technologies. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0059] Figure 1 A schematic structural diagram of a display device provided in some embodiments of the present application is shown;

[0060] Figure 2 A schematic diagram showing the structure of a voltage conversion circuit in a display device provided in some embodiments of the present application is shown;

[0061] Figure 3 A schematic diagram showing the structure of a power supply circuit and a display device using the same provided in some embodiments of the present application is shown;

[0062] Figure 4 A schematic diagram of the structure of a power supply circuit provided in some embodiments of the present application is shown;

[0063] Figure 5 A schematic diagram showing the structure of a voltage stabilizing circuit in a power supply circuit provided in some embodiments of the present application is shown;

[0064] Figure 6 A schematic structural diagram of a power-on switch circuit in a power supply circuit provided in some embodiments of the present application is shown;

[0065] Figure 7 A schematic diagram of the structure of an access detection circuit in a power supply circuit provided in some embodiments of the present application is shown. DETAILED DESCRIPTION

[0066] In order to make the purpose and implementation of this application clearer, the exemplary implementation of this application will be clearly and completely described below in conjunction with the drawings in the exemplary embodiments of this application. Obviously, the described exemplary embodiments are only part of the embodiments of this application, not all of the embodiments.

[0067] It should be noted that the brief descriptions of terms in this application are only for the purpose of facilitating the understanding of the embodiments described below, and are not intended to limit the embodiments of this application. Unless otherwise specified, these terms should be understood according to their ordinary and usual meanings.

[0068] In the specification and claims of this application and the accompanying drawings, the terms "first," "second," "third," etc. are used to distinguish similar or similar objects or entities, and are not necessarily intended to limit a particular order or sequence, unless otherwise noted. It should be understood that the terms used in this manner are interchangeable under appropriate circumstances.

[0069] The terms "comprise," "include," and "have," and any variations thereof, are intended to cover but not exclude inclusion; for example, a product or device comprising a list of components is not necessarily limited to all the components expressly listed but may include other components not expressly listed or inherent to such product or device.

[0070] The following first describes the application scenarios and existing problems of this application with reference to the accompanying drawings.

[0071] In recent years, various display technologies have continued to develop to meet diverse display needs. Specifically, with the advancement of laser projection display technology, projection devices such as laser TVs, laser micro-projectors, and art TVs have gradually entered people's work and daily lives, meeting diverse display needs. The following uses laser projection equipment as an example to explain the basic architecture of display devices.

[0072] Figure 1 The architecture diagram of the laser projection device provided in some embodiments. Figure 1 The laser projection device 100 includes a power supply circuit 110 and a plurality of loads, and the output end of the power supply circuit 110 is coupled to each load respectively.

[0073] Among them, the power supply circuit 110 has an adapter input interface IN-adapt; the power adapter matching the laser projection device 100 converts the AC power into DC power, and inputs it into the power supply circuit 110 through the adapter input interface IN-adapt, so that each load circuit can be powered by the power supply circuit 110.

[0074] In some embodiments, the load may include a light source circuit 120. The light source circuit 120 includes a light source driving circuit and a laser light source. The laser light source may include one or more lasers. The light source driving circuit may drive each laser in the laser light source according to a driving control signal to control each laser to emit light or not.

[0075] The laser light source can be a monochromatic laser light source, meaning that each laser emits the same color. In the case of a monochromatic laser light source, the laser projection device 100 also includes a phosphor wheel and a color filter wheel. For example, the monochromatic laser light source is typically a blue laser that emits blue laser light. This blue laser light source sequentially irradiates three different areas of the phosphor wheel, thereby generating three colors of light. These three colors of light are then filtered sequentially by the color filter wheel to produce higher-purity three primary colors of light.

[0076] The laser light source may be a three-color laser light source, i.e., comprising three lasers capable of emitting three different colors. For example, the three-color laser light source typically comprises a blue laser for emitting blue laser light, a red laser for emitting red laser light, and a green laser for emitting green laser light.

[0077] In some embodiments, the above load may also include Figure 1 The main control chip 130, the display control circuit 140, and Figure 1 One or more of a fan, a speaker, a communication circuit, etc. not shown.

[0078] The main control chip 130 may be a system on chip (SOC). As the control center of the laser projection device 100, the main control chip 130 may uniformly control the power supply circuit 110, the light source circuit 120, the display control circuit 140, etc. in the laser projection device 100. In addition, the main control chip 130 may also receive an image signal to be displayed transmitted from an external signal source, or read an image signal to be displayed from a local device and transmit it to the display control circuit 140, such as Figure 1 shown.

[0079] The display control circuit 140 can analyze the image signal to be displayed transmitted by the main control chip 130, generate a driving signal, and transmit it to the light source circuit 120, such as Figure 1 shown.

[0080] In some embodiments, the display control circuit 140 may include a digital light processor (DLP). The DLP uses digital light processing technology to modulate the video signal. On the one hand, it drives the laser light source 122 to emit a light beam of corresponding color and brightness. On the other hand, it drives a light valve imaging device, such as a digital micromirror device (DMD), to reflect the light beam emitted by the laser light source 122. The reflected light beam is projected onto the projection screen through the projection lens to form a projection image.

[0081] In some embodiments, since the voltage required by the light source circuit 120 is relatively high and the light source driving circuit in the light source circuit 120 has a voltage conversion function, the first electrical signal received by the adapter input interface IN-adapt can be directly input into the light source circuit 120, such as Figure 1 shown.

[0082] In some embodiments, since the voltage required by the load circuits such as the main control chip 130 and the display control circuit 140 is relatively low, a voltage conversion circuit 112 is further provided in the power supply circuit 110. Figure 1 As shown; the first electrical signal received by the adapter input interface IN-adapt is down-converted by the voltage conversion circuit 112 to obtain a third electrical signal, and the third electrical signal is output to the main control chip 130, the display control circuit 140 and other low-voltage load circuits, thereby powering these low-voltage load circuits through the third electrical signal.

[0083] In some embodiments, continue to refer to Figure 1 The power supply circuit 110 is further provided with a tank circuit 111. The tank circuit 111 can serve as a backup power source for the laser projection device. When the power adapter cannot be used for power supply, the tank circuit 111 can output a second electrical signal to continue to power the laser projection device.

[0084] Exemplarily, the above-mentioned situations where the power adapter cannot be used for power supply may include using the laser projection device outdoors, transferring the laser projection device from one room to another, or a sudden power outage of the mains.

[0085] Similar to the above-mentioned first electrical signal, on the one hand, the second electrical signal output by the energy storage circuit 111 can be directly input into the light source circuit 120 to power the light source circuit 120; on the other hand, the second electrical signal can also be stepped down by the voltage conversion circuit 112 to obtain a third electrical signal that matches the low-voltage load circuits such as the main control chip 130 and the display control circuit 140, and then power these low-voltage load circuits through the third electrical signal.

[0086] In some embodiments, continue to refer to Figure 1 The laser projection device 100 further includes a standby circuit 150. The standby circuit 150 may be an independent circuit in the laser projection device 100, or may be a collection of one or more circuits in the laser projection device 100 that remain in operation in the standby state.

[0087] Exemplarily, the standby circuit 150 may include a key signal circuit for responding to a user's operation of a power key or other key in the standby state to wake up the laser projection device 100 and switch it to a normal working state.

[0088] Exemplarily, the standby circuit 150 may include a wireless communication circuit based on at least one wireless communication method such as infrared, Bluetooth, WIFI, etc., for receiving a wake-up command sent by the user through a remote control, smart terminal, etc. in the standby state to wake up the laser projection device 100.

[0089] Exemplarily, the standby circuit 150 may further include a status indication circuit for prompting the user that the laser projection device 100 is currently in the standby state by means of an indicator light of a preset color or the like.

[0090] In different laser projection devices, the specific structure of the standby circuit 150 may be different, and the embodiments of the present application do not limit this.

[0091] In some embodiments, the standby circuit 150 is coupled to the voltage conversion circuit 112 , that is, the voltage conversion circuit 112 performs voltage conversion on the first electrical signal input by the adapter input interface IN-adapt or the second electrical signal output by the energy storage circuit 111 to power the standby circuit 150 .

[0092] The above embodiment introduces the main architecture of the laser projection device, which provides basic illumination for the imaging system through the light source circuit 120. In different embodiments, for different types of display devices, different load circuits can be used according to different display principles to provide basic illumination for the imaging system of the display device.

[0093] Exemplarily, for a liquid crystal display device, a backlight circuit can be used to provide basic lighting for the imaging system; the backlight circuit can include a backlight driving circuit and a backlight light source; the backlight light source can include any one of an LED light bar and a MiniLED light panel.

[0094] In addition, for other types of projection equipment, the light source circuit thereof may not use a laser light source, but may use any light source such as a mercury lamp, an LED lamp, etc.

[0095] In order to adapt to the working requirements of different loads such as the main control chip 130 and the display control circuit 140, the voltage conversion circuit 112 can have multiple voltage output terminals, each outputting a different voltage to meet the different power supply requirements of different loads.

[0096] In some embodiments, the voltage conversion circuit 112 may be designed as a two-stage buck circuit. Figure 2 FIG. 1 shows a schematic structural diagram of the voltage conversion circuit 112 in some embodiments.

[0097] like Figure 2 As shown, the voltage conversion circuit 112 includes a first-stage step-down circuit 1121, which is configured to reduce the high-voltage electrical signal (such as 19V or 36V) provided by the power adapter or energy storage circuit to 12V; the 12V electrical signal can be used to power devices such as cooling fans and speakers in the laser projection equipment.

[0098] like Figure 2 As shown, the voltage conversion circuit 112 also includes a second-stage step-down circuit 1122, which is configured to further reduce the 12V electrical signal output by the first-stage step-down circuit 1121 to 5V; the 5V electrical signal can power the main control chip in the laser projection device.

[0099] Figure 2 This is only an example of a voltage conversion circuit. In other possible embodiments, voltage conversion circuits with other structures can be provided according to the requirements of different display devices to provide different power supply voltages to different loads in the display device.

[0100] In related art, display devices use a voltage conversion circuit within their power supply circuit to power their standby circuits. To reduce costs, a lower supply voltage is typically not designed specifically for the standby circuit. Instead, the lowest supply voltage of other loads, such as 5V, is directly used, resulting in a relatively high power consumption for the standby circuit. Furthermore, when powered by a tank circuit, as the remaining charge in the tank circuit decreases, its output voltage also decreases. When the voltage conversion circuit's output voltage drops to a level that no longer meets its operating requirements, the voltage conversion circuit ceases operation and is unable to continue powering the standby circuit.

[0101] In view of this, if Figure 3 As shown, some embodiments of the present application provide a power supply circuit 210 and a display device 200 using the same, which can reduce the power consumption of the display device 200 in the standby state.

[0102] In some embodiments, referring to Figure 3 The display device 200 includes a load circuit 220, which is configured to provide a light source required for displaying a picture on the display device 200. For different types of display devices 200, the load circuit 220 may be different.

[0103] In some embodiments, when the display device 200 is a projection device, the load circuit 220 may be a light source circuit, which may include a light source driving circuit and a projection light source.

[0104] Exemplarily, the projection light source may include any one of a laser light source, a mercury lamp, and an LED lamp.

[0105] In some embodiments, when the display device 200 is a liquid crystal display device, the load circuit 220 may be a backlight circuit, which may include a backlight driving circuit and a backlight light source.

[0106] Exemplarily, the above-mentioned backlight light source may include any one of an LED light bar and a MiniLED light panel.

[0107] In some embodiments, the display device 200 further includes at least one of a main control chip 230 , a display control circuit 240 , and a standby circuit 250 , etc., and their functions can refer to the relevant descriptions of the previous embodiments, and the similarities are not repeated here.

[0108] Continue to refer to Figure 3 The display device 200 further includes a power supply circuit 210 configured to supply power to the load circuit 220, the main control chip 230, and other loads. The power supply circuit 210 includes an adapter input interface IN-adapt, an energy storage circuit 211, a battery management circuit 213, and a voltage conversion circuit 212.

[0109] Among them, the adapter input interface IN-adapt can receive the first electrical signal input by the power adapter and directly power the load circuit 220, or after being converted into a third electrical signal by the voltage conversion circuit 212, power the main control chip 230, the display control current 240 and the standby circuit 250.

[0110] The battery management circuit 213 is coupled to the energy storage circuit 211 and is configured to control the charge and discharge states of the energy storage circuit 211. In the discharge state, the energy storage circuit 211 can output a second electrical signal to directly power the load circuit 220, or, after being converted by the voltage conversion circuit 212 into a third electrical signal, power the main control chip 230 and the display control circuit 240. In the charging state, the voltage conversion circuit 212 can convert the first electrical signal received by the adapter input interface IN-adapt into the charging electrical signal required by the energy storage circuit 211, such as a 5V electrical signal, to charge the energy storage circuit 211.

[0111] In some embodiments, the battery management circuit 213 can control the charging and discharging state and charging and discharging power of the energy storage circuit 211 based on information such as the working status of the display device 200, whether the adapter input interface IN-adapt is connected to a power adapter, and the remaining power of the energy storage circuit 211.

[0112] Exemplarily, when a power adapter is connected to the adapter input interface IN-adapt and the remaining power of the energy storage circuit 211 is lower than the preset power, the battery management circuit 213 can control the energy storage circuit 211 to be in a charging state to charge the energy storage circuit 211 through the first electrical signal input by the power adapter.

[0113] For example, when a power adapter is connected to the adapter input interface IN-adapt and the remaining power of the energy storage circuit 211 is lower than the preset power, if the display device 200 is in normal working condition, the battery management circuit 213 can control the energy storage circuit 211 to charge with a preset small current to avoid the charging process affecting the power supply of the first electrical signal to the load circuit 220 and other load circuits.

[0114] For example, when a power adapter is connected to the adapter input interface IN-adapt and the remaining power of the energy storage circuit 211 is lower than the preset power, if the display device 200 is in standby mode, that is, there is no need to power the load circuit 220 and other load circuits through the first electrical signal, the battery management circuit 213 can control the energy storage circuit 211 to charge with a preset large current to increase the charging rate.

[0115] For example, when the adapter input interface IN-adapt is not connected to a power adapter (i.e., power is required through the energy storage circuit 211) and the display device 200 is in normal working condition, the battery management circuit 213 can control the energy storage circuit 211 to be in a discharge state, so that the energy storage circuit 211 outputs the above-mentioned second electrical signal to power load circuits such as the load circuit 220 and the main control chip 230.

[0116] Exemplarily, when the adapter input interface IN-adapt is not connected to a power adapter and the display device 200 is in a standby state, the battery management circuit 213 may control the energy storage circuit 211 to be in a discharging state to supply power to the standby circuit 250 .

[0117] In some embodiments, to reduce standby power, the power supply circuit 210 is further provided with a voltage stabilizing circuit 214. The voltage stabilizing circuit 214 is coupled to the energy storage circuit 211 and the standby circuit 250, respectively, and is configured to convert the second electrical signal output by the energy storage circuit 211 into a fourth electrical signal, so as to power the standby circuit 250 via the fourth electrical signal. The voltage of the fourth electrical signal is lower than the voltage of the third electrical signal converted by the voltage conversion circuit 212.

[0118] In the above embodiment, based on the voltage stabilizing circuit 214 , when the adapter input interface IN-adapt is not connected to a power adapter and the display device 200 is in standby mode, the energy storage circuit 211 can supply power to the standby circuit 250 through the voltage stabilizing circuit 214 .

[0119] Compared with the third electrical signal converted by the voltage conversion circuit 212 to power the standby circuit 250, the voltage stabilizing circuit 214 can output a fourth electrical signal with a lower voltage. On the premise of meeting the power supply requirements of the standby circuit 250, the standby power is reduced, thereby reducing the discharge speed of the energy storage circuit 211 in the standby state, extending the standby time, and reducing the risk of over-discharge of the energy storage circuit 211.

[0120] In some embodiments, the battery management circuit 213 can obtain a standby signal (STB) and determine the operating state of the display device 200 based on the standby signal. For example, the main control chip 230 can determine the state of the display device 200 based on information such as the remote control signal and the feedback voltage of the load circuit 220, and generate the standby signal accordingly.

[0121] For example, the display device 200 corresponds to a remote control device, and the remote control command issued by the remote control device can instruct the display device 200 to switch between the standby state and the normal working state. Based on this, the main control chip 230 can receive the remote control command issued by the remote control device and then generate a corresponding standby signal according to the remote control command.

[0122] For example, the main control chip 230 can determine whether the display device 200 is in standby state or normal working state according to the working state of the load circuit 220, such as whether the driving circuit in the load circuit 220 outputs the power supply voltage, whether the light source is in the luminous state, etc., and then generate a standby signal.

[0123] Of course, the specific manner in which the main control chip 230 generates the standby signal is merely an example and is not limited thereto in practical applications.

[0124] In some embodiments, the standby signal STB can represent different states of the display device 200 through different levels. For example, the standby signal STB can be configured as a low-level active signal, that is, when the standby signal STB is at a high level, it indicates that the display device 200 is not in standby mode, that is, in a normal working state; when the standby signal STB is at a low level, it indicates that the display device 200 is in a standby state.

[0125] It should be noted that, to simplify the description, the “receiving a standby signal” described in the embodiments of this specification refers to receiving a low-level standby signal STB, which indicates that the display device 200 is in a standby state; conversely, the “not receiving a standby signal” described in the embodiments of this specification refers to receiving a high-level standby signal STB, which indicates that the display device 200 is in a normal working state.

[0126] Of course, in other embodiments, the standby signal STB may also be configured as a high-level valid signal, and the circuits related to the standby signal STB may also be adaptively configured to implement the relevant functions in the embodiments of the present application.

[0127] In some embodiments, the battery management circuit 213 is provided with an operating voltage input terminal for receiving the operating voltage required for powering up the electromagnetic management circuit 213. For example, the operating voltage input terminal of the battery management circuit 213 can be coupled to the energy storage circuit 211, so that the energy storage circuit 211 provides the operating voltage required by the battery management circuit 213.

[0128] In some embodiments, the battery management circuit 213 is further coupled to the voltage conversion circuit 212 to enable and control the voltage conversion circuit 212. Specifically, the battery management circuit 213 is further configured to:

[0129] When the adapter input interface IN-adapt is not connected to a power adapter (i.e., power is required through the energy storage circuit 211) and the display device 200 is in a normal operating state (i.e., the battery management circuit 213 has not received a standby signal), the voltage conversion circuit 212 is enabled to convert the second electrical signal output by the energy storage circuit 211 into a third electrical signal through the voltage conversion circuit 212 to power low-voltage load circuits such as the main control chip 230;

[0130] Furthermore, when the adapter input interface IN-adapt is not connected to a power adapter and the display device 200 is in standby mode (i.e., the battery management circuit 213 receives a standby signal), the voltage conversion circuit 212 is turned off to interrupt the output of the third electrical signal, so that the standby circuit 250 can be powered only by the fourth electrical signal output by the voltage stabilizing circuit 214.

[0131] Exemplarily, the battery management circuit 213 may include a microcontroller, which can receive and process information such as the working status of the above-mentioned display device 200, whether the adapter input interface IN-adapt is connected to a power adapter, the remaining power of the energy storage circuit 211, etc., thereby generating a signal for controlling the charging and discharging of the energy storage circuit 211, or a signal for enabling control of the voltage conversion circuit 212.

[0132] In the above embodiment, by configuring the control logic of the battery management circuit 213, it can not only control the charging and discharging of the energy storage circuit 211, but also enable or disable the voltage conversion circuit 212 according to information such as whether the power adapter is connected and whether the display device 200 is in standby mode, thereby ensuring that when the display device 200 is working normally, the third electrical signal can be output by the voltage conversion circuit 212 to power low-voltage load circuits such as the main control chip 230. When the display device 200 is in standby mode, the output of the third electrical signal of the voltage conversion circuit 212 can be interrupted, so that the fourth electrical signal with a lower voltage can be output by the voltage stabilizing circuit to power the standby circuit 250, thereby reducing standby power, extending the standby time of the energy storage circuit 211, and reducing the risk of over-discharge of the energy storage circuit 211.

[0133] In addition, when the adapter input interface IN-adapt is connected to a power adapter, there will be no problem of limited power supply, so the battery management circuit 213 does not need to control the voltage conversion circuit 212. That is, regardless of whether the display device 200 is in standby mode, the third electrical signal output by the voltage conversion circuit 212 can be used to power circuits such as the main control chip 230, the display control circuit 240 and the standby circuit 250.

[0134] In some embodiments, the voltage conversion circuit 212 may be provided with an enable control terminal for receiving an enable control signal. For example, the enable control signal may include a high-level enable control signal and a low-level disable control signal.

[0135] Based on this, the battery management circuit 213 can be configured to send an enable control signal to the voltage conversion circuit 212 when the adapter input interface IN-adapt is not connected to a power adapter (i.e., power is required through the energy storage circuit 211) and the display device 200 is in normal operation (i.e., the battery management circuit 213 has not received a standby signal). Accordingly, when the enable control terminal receives the enable control signal, the voltage conversion circuit 212 is enabled and can convert the input signal into a voltage.

[0136] At the same time, the battery management circuit 213 is further configured to send a shutdown control signal to the voltage conversion circuit 212 when no power adapter is connected to the adapter input interface IN-adapt and the display device 200 is in a standby state (i.e., the battery management circuit 213 receives a standby signal). Accordingly, when the enable control terminal receives the shutdown control signal, the voltage conversion circuit 212 stops operating, no longer performs voltage conversion, and no longer outputs the third electrical signal.

[0137] In the above embodiment, the battery management circuit 213 directly controls the state of the voltage conversion circuit 212 by sending an enable control signal to the voltage conversion circuit 212, so that when the power is supplied by the energy storage circuit 211 and the display device 200 is on standby, the voltage conversion circuit 212 can be turned off and the output of the third electrical signal can be stopped, so that the fourth electrical signal with a lower voltage can be output through the voltage stabilizing circuit to power the standby circuit 250, reduce the standby power, extend the standby time of the energy storage circuit 211, and reduce the risk of over-discharge of the energy storage circuit 211.

[0138] In some embodiments, the voltage conversion circuit 212 may include a buck circuit; the buck circuit may be a single-stage buck circuit or a Figure 2 The multi-stage buck circuit shown.

[0139] In view of this, in order to achieve the enabling control of the voltage conversion circuit 212, the battery management circuit 213 can be configured as follows:

[0140] When the adapter input interface IN-adapt is not connected to a power adapter (i.e., power is required through the energy storage circuit 211) and no standby signal is received, the voltage of the second electrical signal output by the energy storage circuit 211 is controlled to be no less than the preset input voltage of the voltage conversion circuit 212, so that the voltage conversion circuit 212 can perform a voltage reduction function and output a third electrical signal;

[0141] Furthermore, when the adapter input interface IN-adapt is not connected to a power adapter and receives a standby signal, the energy storage circuit 211 is controlled to adjust the voltage of the second electrical signal so that the voltage of the second electrical signal is less than the preset input voltage of the voltage conversion circuit 212, so that the voltage conversion circuit 212 is turned off and no longer outputs the third electrical signal.

[0142] Exemplarily, the preset input voltage can be set to the output voltage of the voltage conversion circuit 212, or any voltage value greater than the output voltage thereof. Of course, in order to reduce the power consumption of the voltage conversion circuit 212, the preset input voltage should not be too large. Figure 2 Taking the first-stage buck circuit 1121 as an example, its output voltage is 12V, and its preset input voltage can be set to 12V, 15V, etc.

[0143] In the above embodiment, when the voltage conversion circuit 212 is a step-down circuit, the battery management circuit 213 can indirectly control the state of the voltage conversion circuit 212 by controlling the voltage of the second electrical signal output by the energy storage circuit 211. Therefore, there is no need for additional communication between the battery management circuit 213 and the voltage conversion circuit 212. When the energy storage circuit 211 is powered and the display device 200 is in standby mode, the voltage conversion circuit 212 can be turned off by reducing the voltage of the second electrical signal, and the output of the third electrical signal can be stopped. Therefore, a fourth electrical signal with a lower voltage can be output through the voltage stabilizing circuit to power the standby circuit 250, thereby reducing the standby power, extending the standby time of the energy storage circuit 211, and reducing the risk of over-discharge of the energy storage circuit 211.

[0144] Figure 4 Schematic diagram of the structure of the power supply circuit 210 in the display device 200 provided in some embodiments of the present application.

[0145] In some embodiments, such as Figure 4 As shown, the voltage stabilizing circuit 214 includes: an operating voltage receiving terminal IN3, a standby signal receiving terminal IN4 and a power supply output terminal OUT2.

[0146] The working voltage receiving terminal IN3 is configured to receive the working voltage signal VCC1, which is used to provide the voltage required for the normal operation of the voltage stabilizing circuit 214. The standby signal receiving terminal IN4 is configured to receive the standby signal, ie, the STB signal.

[0147] The power output terminal OUT2 is coupled to the standby circuit 250 and is configured to output a fourth electrical signal having a voltage of VCC2 to the standby circuit 250. VCC2 is lower than the voltage of the third electrical signal described in the previous embodiment, and can be, for example, 3.3V, 1.2V, etc., and can be specifically configured based on the minimum operating voltage required by the standby circuit 250.

[0148] The voltage stabilizing circuit 214 is configured to conduct between its operating voltage receiving terminal IN3 and the power supply output terminal OUT2 when the standby signal receiving terminal IN4 receives the standby signal STB, so that the operating voltage signal VCC1 is converted into a lower voltage signal VCC2, i.e., a fourth electrical signal, to power the standby circuit 250.

[0149] In addition, when the voltage stabilizing circuit 214 does not receive the standby signal STB, the power output terminal OUT2 may not output an electrical signal, or the power output terminal OUT2 may be grounded, so that the standby circuit 250 will not be powered on and the display device 200 can be in a normal working state.

[0150] In the above embodiment, the voltage stabilizing circuit 214 of the power supply circuit 210 in the display device 200 has a standby signal receiving end, so that whether the voltage stabilizing circuit 214 outputs the fourth electrical signal can be controlled by the standby signal STB. Further, when the display device 200 is on standby, the voltage stabilizing circuit 214 can be controlled to supply power to the standby circuit 250, thereby reducing the standby power.

[0151] In some embodiments, such as Figure 4 As shown, the power supply circuit 210 further includes: an access detection circuit 216 and a power-on switch circuit 215 .

[0152] The connection detection circuit 216 is configured to detect the connection status of the power adapter and output a connection detection signal V adapt_on The access detection signal V adapt_on A signal indicating that a power adapter is connected to the adapter input interface IN-adapt.

[0153] In some embodiments, the access detection signal V adapt_on Different levels can be used to indicate different connection states of the power adapter. For example, the connection detection signal V adapt_on Configured as a high-level active signal, that is, when the detection signal V adapt_on When it is high, it means that the adapter input interface IN-adapt is connected to a power adapter; when the detection signal V adapt_on When it is low, it indicates that there is no power adapter connected to the adapter input interface IN-adapt.

[0154] It should be noted that, in order to simplify the description, the “receiving the access detection signal V adapt_on ", means receiving a high level access detection signal V adapt_on , which means that the adapter input interface IN-adapt is connected to a power adapter; on the contrary, the "no access detection signal V adapt_on ", means receiving a low level access detection signal V adapt_on , which means that there is no power adapter connected to the adapter input interface IN-adapt.

[0155] Of course, in other embodiments, the access detection signal V adapt_on Configured as a low-level active signal, with access detection signal V adapt_on The relevant circuits are also adaptively configured to implement the relevant functions in the embodiments of this application.

[0156] In some embodiments, continue to refer to Figure 4The power-on switch circuit 215 may include: a power-on input terminal IN1, a detection signal receiving terminal IN2 and a power-on output terminal OUT1.

[0157] The power-on input terminal IN1 is coupled to the energy storage circuit 211 and is configured to receive the second electrical signal output by the energy storage circuit 211. The power-on output terminal OUT1 is coupled to the working voltage receiving terminal IN3 of the voltage stabilizing circuit 214 and is configured to output the working voltage signal VCC1 required by the voltage stabilizing circuit 214. The detection signal receiving terminal IN2 is configured to receive the access detection signal V adapt_on .

[0158] based on Figure 4 The circuit structure shown in FIG. 2 shows that the power-on switch circuit 215 can be configured as follows: when the detection signal receiving terminal IN2 does not receive the access detection signal V adapt_on In this case, the power-on input terminal IN1 and the power-on output terminal OUT1 are connected, so that the second electrical signal received by the power-on input terminal IN1 is converted into the working voltage signal VCC1 and output.

[0159] In the above embodiment, the detection signal receiving terminal IN2 does not receive the access detection signal V adapt_on , indicating that the adapter input interface IN-adapt is not connected to a power adapter, that is, the display device 200 needs to be powered by the energy storage circuit 211. Therefore, the power-on switch circuit 215 conducts between its power-on input terminal IN1 and the power-on output terminal OUT1, so that the second electrical signal output by the energy storage circuit 211 can be converted into an operating voltage signal VCC1, and output to the operating voltage receiving terminal IN3 of the voltage stabilizing circuit 214, so that the voltage stabilizing circuit 214 is powered on. In other words, the voltage stabilizing circuit 214 can output a fourth electrical signal with a lower voltage when the display device 200 is in standby mode to power the standby circuit 250, thereby reducing standby power, reducing the discharge speed of the energy storage circuit 211, and extending the standby time of the display device 200 when powered by the energy storage circuit 211.

[0160] In addition, based on Figure 4 The circuit structure shown in FIG. 2 shows that the power-on switch circuit 215 is further configured to: receive the access detection signal V at the detection signal receiving terminal IN2. adapt_on In the case of the power-on input terminal IN1 and the power-on output terminal OUT1 being disconnected, the output of the working voltage signal VCC1 to the voltage stabilizing circuit 214 is stopped.

[0161] In the above embodiment, the detection signal receiving terminal IN2 receives the access detection signal V adapt_on, indicating that a power adapter is connected to the adapter input interface IN-adapt, meaning that the display device 200 can be powered preferentially by the power adapter. At this point, regardless of whether the display device 200 is in standby mode or not, the corresponding circuits can be powered by the third electrical signal output by the voltage conversion circuit 212. Based on this, the power-on input terminal IN1 and the power-on output terminal OUT1 of the power-on switch circuit 215 can be disconnected, preventing the power-on switch circuit 215 from powering the voltage regulator circuit 214. This disables the voltage regulator circuit 214, preventing the standby circuit 250 from being powered by the voltage regulator circuit 214 even in standby mode, thus conserving energy in the energy storage device 211.

[0162] In some embodiments, such as Figure 5 As shown, the voltage stabilizing circuit 214 may include a first switch V31 , a second switch V32 , and a first voltage stabilizing diode VZ31 .

[0163] In which, the first end of the first switch V31 is coupled to the working voltage receiving end IN3 of the voltage stabilizing circuit 214, and the second end of the first switch V31 is coupled to the power supply output end OUT2 of the voltage stabilizing circuit 214, so that when the first switch V31 is turned on, the power supply output end OUT2 can output the fourth electrical signal with the above-mentioned voltage VCC2.

[0164] The cathode of the first Zener diode VZ31 is coupled to the control terminal of the first switch V31 . The cathode of the first Zener diode VZ31 is also coupled to the working voltage receiving terminal IN3 via the first resistor R31 . The anode of the first Zener diode VZ31 is grounded.

[0165] A first end of the second switch V32 is coupled to the cathode of the first Zener diode VZ31 , a second end of the second switch V32 is coupled to the anode of the first Zener diode VZ31 , and a control end of the second switch V32 is coupled to the standby signal receiving end IN4 .

[0166] In some embodiments, the first switch V31 and the second switch V32 may both be transistors that conduct at a high level. Based on this, the working principle of the voltage stabilizing circuit 214 is as follows:

[0167] When the display device 200 is in normal working state, the STB signal is at a high level, i.e., the control terminal of the second switch V32 receives the high level signal, the second switch V32 is turned on, thereby grounding the control terminal of the first switch V31, and the first switch V31 is turned off. The working voltage receiving terminal IN3 and the power supply output terminal OUT2 of the voltage stabilizing circuit 214 are disconnected. In this way, when the display device 200 is in normal working state, the voltage stabilizing circuit 214 does not supply power to the standby circuit 250.

[0168] When the display device 200 is in the standby state, the STB signal is low level, that is, the control end of the second switch V32 receives a low level signal, and the second switch V32 is turned off, so that the reference voltage V provided by the first voltage stabilizing diode VZ31 is VZ31 The control terminal of the first switch V31 is applied, and the first switch V31 is turned on. That is, the working voltage receiving terminal IN3 and the power supply output terminal OUT2 of the voltage stabilizing circuit 214 are connected, so that the voltage stabilizing circuit 214 supplies power to the standby circuit 250 when the display device 200 is in standby mode.

[0169] In addition, when the first switch V31 is turned on and the voltage stabilizing circuit 214 supplies power to the standby circuit 250, the first voltage stabilizing diode VZ31 can provide a stable reference voltage V VZ31 , that is, the emitter voltage V of the first switch V31 BE31 The sum of the voltage between the control terminal and the second terminal of the first switch V31 and the output voltage VCC2 is fixed. VZ31 =V BE31 +VCC2.

[0170] If the output voltage VCC2 decreases due to some reasons, V BE31 When the output voltage VCC2 increases, the first switch V31 is more fully turned on, the voltage between the first terminal and the second terminal of the first switch V31 decreases, and the working voltage VCC1 input by the working voltage receiving terminal IN3 is more applied to the power supply output terminal OUT2, thereby causing the output voltage VCC2 to increase again. Conversely, when the output voltage VCC2 increases, V BE31 The voltage between the first terminal and the second terminal of the first switch V31 increases, and the voltage VCC2 outputted by the power supply output terminal OUT2 decreases. Therefore, the voltage stabilizing circuit 214 can ensure the stability of the output voltage VCC2.

[0171] In order to further improve the stability of the output voltage, in some embodiments, such as Figure 5 As shown, the voltage stabilization circuit 214 may further include a first capacitor C31 and a second capacitor C32. The first capacitor C31 is coupled to the first terminal and the control terminal of the first switch V31, respectively, and is connected in parallel with the first resistor R31 to prevent sudden voltage changes between the first terminal and the control terminal of the first switch V31. One terminal of the second capacitor is connected to the power supply output OUT2, and the other terminal is grounded, thereby preventing sudden changes in the output voltage VCC2 of the power supply output OUT2.

[0172] In the above embodiment, by setting the first switch, the second switch and the first voltage stabilizing diode in the voltage stabilizing circuit 214, it is possible not only to control whether to power the standby circuit 250 according to the standby signal, but also to ensure that a stable power supply voltage is provided when powering the standby circuit 250, thereby reducing the standby power.

[0173] In some embodiments, such as Figure 6 As shown, the power-on switch circuit 215 may include: a third switch V21 , a fourth switch V22 , and a second Zener diode VZ21 .

[0174] Among them, the first end of the third switch V21 is coupled to the power-on input terminal IN1 of the power-on switch circuit 215, and the second end of the third switch V21 is coupled to the power-on output terminal OUT1 of the power-on switch circuit 215, so that when the third switch V21 is turned on, the power-on output terminal OUT1 can output the operating voltage VCC1 to the voltage regulator circuit 214.

[0175] The cathode of the second zener diode VZ21 is coupled to the control terminal of the third switch V21 . The cathode of the second zener diode VZ21 is also coupled to the power-on input terminal IN1 via the second resistor R1 . The anode of the second zener diode VZ21 is grounded.

[0176] A first end of the fourth switch V22 is coupled to the cathode of the second Zener diode VZ21 , a second end of the fourth switch V22 is coupled to the anode of the second Zener diode VZ21 , and a control end of the fourth switch V22 is coupled to the detection signal receiving end IN2 of the power-on switch circuit 215 .

[0177] In some embodiments, the third switch V21 and the fourth switch V22 may also be transistors that conduct at a high level. Based on this, the working principle of the power-on switch circuit 215 is as follows:

[0178] When the adapter input interface IN-adapt is connected to a power adapter, the detection signal V adapt_on is high, so the fourth switch V22 is turned on, thereby grounding the control terminal of the third switch V21, turning off the third switch V21, disconnecting the power-on input terminal IN1 and the power-on output terminal OUT1 of the power-on switch circuit 215, and the second electrical signal received by the power-on input terminal IN1 cannot be converted into the working voltage signal VCC1. In this way, when the power adapter is connected, the voltage stabilizing circuit 214 is not powered by the energy storage circuit 211, and the standby circuit 250 is not powered by the energy storage circuit 211.

[0179] When the adapter input interface IN-adapt is not connected to the power adapter, the detection signal V adapt_on is low level, so the fourth switch V22 is turned off, so that the reference voltage V provided by the second voltage stabilizing diode VZ21 is VZ21The control terminal of the third switch V21 is applied, the third switch V21 is turned on, and the power-on input terminal IN1 and the power-on output terminal OUT1 of the power-on switch circuit 215 are connected, so that when the power adapter is not connected, the voltage stabilizing circuit 214 is powered by the energy storage circuit 211, so that the voltage stabilizing circuit 214 can perform the functions described in the previous embodiments, such as controlling whether to power the standby circuit 250 according to the standby signal.

[0180] In addition, the power-on switch circuit 215 can also ensure the stability of its output voltage VCC1. The specific principle is the same as the voltage stabilization principle of the voltage stabilization circuit 214, which will not be repeated here.

[0181] In the above embodiment, by providing a third switch, a fourth switch, and a second voltage stabilizing diode, etc. in the power-on switch circuit 215, it is possible not only to control whether to power the voltage stabilizing circuit 214 through the energy storage circuit 211 according to whether the power adapter is connected, but also to ensure that a stable power supply voltage is provided when powering the voltage stabilizing circuit 214.

[0182] In some embodiments, the power-on switch circuit 215 further includes an isolation diode VD21 ; an anode of the isolation diode VD21 is coupled to the power-on input terminal IN1 , and a cathode of the isolation diode VD21 is coupled to the first terminal of the third switch V21 .

[0183] In the above embodiment, an isolation diode is provided at the power-on input terminal of the power-on switch circuit 215 to ensure unidirectional current flow, that is, current flows from the energy storage circuit 211 into the power-on switch circuit 215, thereby preventing current from flowing back into the energy storage circuit 211 and ensuring the safety of the energy storage circuit 211.

[0184] In some embodiments, the power-on output terminal OUT1 of the power-on switch circuit 215 is also coupled to the operating voltage input terminal of the battery management circuit 213. In this way, the operating voltage signal VCC1 output by the power-on switch circuit 215 can be used to control the battery management circuit 213 to power on. This ensures that the battery management circuit 213 is powered on only when the power adapter is not connected and power is supplied by the energy storage circuit 211, thereby avoiding energy waste in the energy storage circuit 211.

[0185] In some embodiments, referring to Figure 7 , the access detection circuit 216 includes a first voltage dividing resistor R12 and a second voltage dividing resistor R13. Figure 7As shown, the first end of the first voltage-dividing resistor R12 is coupled to the adapter input interface IN-adapt, the second end of the first voltage-dividing resistor R12 is coupled to the first end of the second voltage-dividing resistor R13, and the second end of the second voltage-dividing resistor R13 is grounded. At the same time, the first end of the second voltage-dividing resistor R13 serves as the signal output end of the access detection circuit 216 and is coupled to the detection signal receiving end IN2 of the power-on switch circuit 215. That is, the voltage signal at the first end of the second voltage-dividing resistor R13 serves as the access detection signal V adapt_on .

[0186] like Figure 7 As shown, when the power adapter is not connected, the first end of the second voltage divider resistor R13 is equivalent to grounding, so the output connection detection signal V adapt_on When the power adapter is connected, the first voltage divider resistor R12 and the second voltage divider resistor R13 divide the first electrical signal input by the power adapter, so that the access detection signal output by the first end of the second voltage divider resistor R13 is V adapt_on Therefore, the detection signal V adapt_on The level of the power supply determines whether the power adapter is connected.

[0187] Exemplarily, at least one of the first voltage-dividing resistor R12 and the second voltage-dividing resistor R13 may include a plurality of resistors connected in series or in parallel; the second voltage-dividing resistor R13 may also be connected in parallel with a capacitor C11 to allow the detection signal V adapt_on Stablize,

[0188] In addition, in order to further improve the safety of the circuit system, in the embodiment of the present application, an isolation diode is further provided at the adapter input interface IN-adapt to prevent voltage backflow and damage to the power adapter.

[0189] It should be noted that Figure 5 、 Figure 6 and Figure 7 The structures of the circuits shown are for illustrative purposes only and are not limited thereto in practical applications.

[0190] In the above embodiment, the access detection circuit 216, the power-on switch circuit 215 and the voltage stabilizing circuit 214 cooperate with each other to achieve that when the power adapter is not connected, that is, when power is required to be supplied by the energy storage circuit 211, if the display device enters the standby state, the energy storage circuit 211 outputs a lower supply voltage to the standby circuit 250 through the voltage stabilizing circuit 214, thereby reducing standby power consumption, extending standby time, and reducing the risk of over-discharge of the energy storage circuit 211.

[0191] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

[0192] For ease of explanation, the above description has been made with reference to specific embodiments. However, the above exemplary discussion is not intended to be exhaustive or to limit the embodiments to the specific forms disclosed above. Based on the above teachings, various modifications and variations are possible. The above embodiments are selected and described to better explain the principles and practical applications, so that those skilled in the art can better utilize the embodiments and various different variations of the embodiments suitable for specific use considerations.

Claims

1. A power supply circuit, characterized in that: Applied to display devices, including: The adapter input interface is configured to receive a first electrical signal input by a power adapter; a tank circuit configured to output a second electrical signal; a battery management circuit coupled to the energy storage circuit and configured to control the energy storage circuit to output the second electrical signal when the adapter input interface is not connected to the power adapter; a voltage conversion circuit, coupled to the adapter input interface, the energy storage circuit, and the standby circuit of the display device, respectively, and configured to convert the first electrical signal or the second electrical signal into a third electrical signal to power the standby circuit via the third electrical signal; Wherein, the power supply circuit further includes: A voltage stabilizing circuit is coupled to the energy storage circuit and the standby circuit respectively, and is configured to convert the second electrical signal into a fourth electrical signal to power the standby circuit through the fourth electrical signal; wherein the voltage of the fourth electrical signal is less than the voltage of the third electrical signal.

2. The power supply circuit according to claim 1, wherein: The battery management circuit is also coupled to the voltage conversion circuit; The battery management circuit is further configured to: When the adapter input interface is not connected to the power adapter and a standby signal is received, the voltage conversion circuit is turned off to cut off the power supply path from the energy storage circuit to the standby circuit through the voltage conversion circuit.

3. The power supply circuit according to claim 2, wherein: The voltage conversion circuit includes a step-down circuit; The battery management circuit is further configured to: When the adapter input interface is not connected to the power adapter and the standby signal is received, the energy storage circuit is controlled to adjust the voltage of the second electrical signal so that the voltage of the second electrical signal is less than the preset input voltage of the step-down circuit, thereby turning off the step-down circuit.

4. The power supply circuit according to claim 2, characterized in that: The battery management circuit is further configured to: When the adapter input interface is not connected to the power adapter and the standby signal is received, a shutdown control signal is sent to the voltage conversion circuit to shut down the step-down conversion circuit.

5. The power supply circuit according to claim 1, wherein: The voltage stabilizing circuit comprises: an operating voltage receiving terminal configured to receive an operating voltage signal; a power supply output terminal, coupled to the standby circuit, and configured to output the fourth electrical signal to the standby circuit; a standby signal receiving end, configured to receive a standby signal; The voltage stabilizing circuit is configured such that, when the standby signal receiving end receives the standby signal, the working voltage receiving end and the power supply output end are electrically connected, so that the working voltage signal is converted into the fourth electrical signal and output.

6. The power supply circuit according to claim 5, characterized in that: The power supply circuit further includes: a power-on switch circuit; The power-on switch circuit comprises: a power-on input terminal coupled to the energy storage circuit and configured to receive the second electrical signal; a power-on output terminal, coupled to the operating voltage receiving terminal of the voltage stabilizing circuit, and configured to output the operating voltage signal; A detection signal receiving end is configured to receive an access detection signal; the access detection signal is a signal indicating that the power adapter is connected to the adapter input interface; The power-on switch circuit is configured to, when the detection signal receiving end does not receive the access detection signal, conduct the power-on input end and the power-on output end, so that the second electrical signal is converted into the working voltage signal and output.

7. The power supply circuit according to claim 5, characterized in that: The voltage stabilizing circuit comprises: a first switch; a first end of the first switch is coupled to the working voltage receiving end, and a second end of the first switch is coupled to the power supply output end; a first zener diode; a cathode of the first zener diode coupled to the control terminal of the first switch, a cathode of the first zener diode further coupled to the working voltage receiving terminal via a first resistor, and an anode of the first zener diode grounded; a second switch; a first end of the second switch is coupled to the cathode of the first voltage-regulating diode, a second end of the second switch is coupled to the anode of the first voltage-regulating diode, and a control end of the second switch is coupled to the standby signal receiving end.

8. The power supply circuit according to claim 6, characterized in that: The power-on switch circuit comprises: a third switch; a first terminal of the third switch is coupled to the power-on input terminal, and a second terminal of the third switch is coupled to the power-on output terminal; a second zener diode; a cathode of the second zener diode coupled to the control terminal of the third switch, a cathode of the second zener diode further coupled to the power-on input terminal via a second resistor, and an anode of the second zener diode grounded; a fourth switch; a first end of the fourth switch is also coupled to the cathode of the second voltage regulator diode, a second end of the fourth switch is coupled to the anode of the second voltage regulator diode, and a control end of the fourth switch is coupled to the detection signal receiving end.

9. The power supply circuit according to claim 6, characterized in that: The power-on output terminal of the power-on switch circuit is also coupled to the battery management circuit to control the power-on operation of the battery management circuit through the operating voltage signal.

10. A display device, characterized in that: include: The power supply circuit according to any one of claims 1 to 9.

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