Power supply equipment and zero standby state control method

Abstract

The invention provides power supply equipment and a zero standby state control method, and relates to the technical field of power management chips, and the power supply equipment comprises an AC-DC conversion circuit, a load switch, a Type-A charging port and a fast charging protocol chip. The fast charging protocol chip obtains state information of the Type-A charging port and judges whether charging equipment is connected to the Type-A charging port or not according to the state information of the Type-A charging port after the fast charging protocol chip is powered on for a preset time length and under the condition that the fast charging protocol chip is not abnormal, and if not, the load switch is controlled to be in a turn-off state; obtaining a low-current signal of the Type-A charging port, judging whether the Type-A charging port is connected with a low-current charging device or not based on the low-current signal, and if yes, controlling the load switch to be in an on state so as to enable the power supply device to be in a charging state; and if not, controlling the AC-DC conversion circuit and itself to enter a zero standby state, so that the power supply equipment enters the zero standby state. The invention provides zero standby power supply equipment based on a Type-A charging interface.

Description

Technical Field

[0001] The present application relates to the technical field of power management chips, and in particular to a power supply device and a zero-standby state control method. Background Art

[0002] In recent years, the rational and efficient use of energy has received high attention from policies and relevant regulations. With the development of electronic technology, the application of numerous new technologies has gradually improved the efficiency of power supply equipment. In daily applications, power supply equipment can be power adapters, charging heads, etc., and charging devices can be mobile phones, laptops, or mobile terminals. For charging systems for mobile phones or other mobile devices, the application scenario is usually that the power supply equipment is electrically connected to the power grid, and the power supply equipment is electrically connected to the charging device via a cable or data cable.

[0003] In daily life, power supply equipment is often in standby mode, without any connected charging devices. While the power consumption of a single power supply device is low, the cumulative power consumption cannot be ignored when considering the long periods of continuous standby time and the simultaneous simultaneous operation of a large number of devices. Therefore, reducing the power consumption of power supply equipment in standby mode is of significant practical significance for achieving energy conservation and improving energy efficiency. The IEC62301 standard defines the minimum accuracy for measuring power consumption in standby mode as 10mW. Currently, under 230V AC input conditions, the industry defines 5mW as the demarcation line for zero standby mode. A standby mode with a power consumption of less than 5mW is called zero standby mode.

[0004] In current charging systems, zero-standby technology is often combined with Universal Serial Bus (USB) charging technology. USB charging technology, with its versatility, convenience, fast charging speed, and safety, has become the mainstream method for charging modern electronic devices. Currently, the most widely used USB charging interfaces are Type-A and Type-C. Due to the different characteristics of Type-A and Type-C charging interfaces, the zero-standby state control methods for each interface vary. Currently, there are zero-standby power supply devices based on the Type-C charging interface on the market, but there are no zero-standby power supply devices based on the Type-A charging interface. Summary of the Invention

[0005] The present application provides a power supply device and a zero-standby state control method to provide a zero-standby power supply device based on a Type-A charging interface.

[0006] In a first aspect, the present application provides a power supply device, comprising: an AC-DC conversion circuit, a load switch, a Type-A charging port, and a fast charging protocol chip;

[0007] The fast charging protocol chip is electrically connected to the AC-DC conversion circuit, the load switch, and the Type-A charging port respectively, the AC-DC conversion circuit is electrically connected to the load switch, and the load switch is electrically connected to the Type-A charging port;

[0008] The fast charging protocol chip is used to obtain the status information of the Type-A charging port after a preset power-on time and when there is no abnormality in itself, and based on the status information, determine whether the Type-A charging port has a charging device connected. If not, control the load switch to switch from the on state to the off state; it is also used to obtain the small current signal of the Type-A charging port after the load switch is in the off state, and based on the small current signal, determine whether the Type-A charging port has a small current charging device connected. If so, control the load switch to the on state to put the power supply device into the charging state; if not, control the AC-DC conversion circuit to enter the zero standby state. After the AC-DC conversion circuit enters the zero standby state, control itself to enter the zero standby state to put the power supply device into the zero standby state.

[0009] In one possible design, when the status information includes port current and communication signals:

[0010] The fast charging protocol chip is used to obtain the port current of the Type-A charging port. When the port current is less than or equal to a preset threshold and the communication signal is not received, it is determined that no charging device is connected to the Type-A charging port, and the load switch is controlled to switch from the on state to the off state.

[0011] In one possible design, before the fast charging protocol chip enters the zero standby state, the fast charging protocol chip is also used to control the load switch to switch from the off state to the on state when receiving the communication signal, so that the power supply device enters the charging state.

[0012] In one possible design, when the power supply device is in the zero standby state, the fast charging protocol chip is also used to obtain the insertion detection voltage of the Type-A charging port. When the insertion detection voltage is lower than the wake-up threshold, it controls itself to exit the zero standby state, so that the power supply device exits the zero standby state and enters the charging state.

[0013] In one possible design, the fast charging protocol chip is used to obtain status information of the Type-A charging port, and based on the status information, determine whether a charging device is connected to the Type-A charging port. If so, control the load switch to be in the on state to put the power supply device into the charging state.

[0014] In a second aspect, the present application provides a zero-standby state control method, which is applied to the power supply device according to the first aspect, and the method includes:

[0015] After a preset power-on time, and without any abnormality, obtaining status information of the Type-A charging port, and determining whether a charging device is connected to the Type-A charging port based on the status information, and if not, controlling the load switch to switch from the on state to the off state;

[0016] After the load switch is in the off state, a low current signal of the Type-A charging port is obtained, and based on the low current signal, whether a low current charging device is connected to the Type-A charging port is determined, and if so, the load switch is controlled to be in the on state to enable the power supply device to be in the charging state;

[0017] If not, control the AC-DC conversion circuit to enter the zero standby state. After the AC-DC conversion circuit enters the zero standby state, control the fast charging protocol chip to enter the zero standby state, so that the power supply device enters the zero standby state.

[0018] In one possible design, when the status information includes port current and communication signals:

[0019] The acquiring status information of the Type-A charging port, and determining whether a charging device is connected to the Type-A charging port based on the status information, and if not, controlling the load switch to switch from an on state to an off state, includes:

[0020] The port current of the Type-A charging port is obtained. When the port current is less than a preset threshold and the communication signal is not received, it is determined that no charging device is connected to the Type-A charging port, and the load switch is controlled to switch from an on state to an off state.

[0021] In one possible design, before the fast charging protocol chip enters the zero standby state, when the communication signal is received, the load switch is controlled to switch from the off state to the on state, so that the power supply device enters the charging state.

[0022] In one possible design, when the power supply device is in the zero standby state, the insertion detection voltage of the Type-A charging port is obtained. When the insertion detection voltage is lower than the wake-up threshold, the fast charging protocol chip is controlled to exit the zero standby state, so that the power supply device exits the zero standby state and enters the charging state.

[0023] In one possible design, status information of the Type-A charging port is obtained, and based on the status information, it is determined whether a charging device is connected to the Type-A charging port. If so, the load switch is controlled to be in the on state to put the power supply device into the charging state.

[0024] Beneficial effects of the embodiments of the present application:

[0025] In an embodiment of the present application, after the fast charging protocol chip is powered on for a preset period of time and there is no abnormality in itself, by obtaining the status information of the Type-A charging port, based on the status information, it is determined whether a charging device is connected to the Type-A charging port. When no charging device is connected to the Type-A charging port, the load switch is controlled to switch from the on state to the off state; after the load switch is in the off state, it enters the zero standby state preprocessing process, in which it is detected whether the Type-A charging port is connected to a low-current charging device. When it is detected that a low-current charging device is connected to the Type-A charging port, the load switch is controlled to be in the on state so that the power supply device is in the charging state; when it is not detected that a low-current charging device is connected to the Type-A charging port, the AC-DC conversion circuit is controlled to enter the zero standby state. After the AC-DC conversion circuit enters the zero standby state, the AC-DC conversion circuit is controlled to enter the zero standby state so that the power supply device enters the zero standby state. Through the above process, a zero standby power supply device based on the Type-A charging interface can be provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other embodiments can also be obtained based on these drawings.

[0027] Figure 1 A schematic diagram of the structure of a power supply device provided in an embodiment of the present application;

[0028] Figure 2 A flowchart for implementing zero standby mode in a power supply device according to an embodiment of the present application;

[0029] Figure 3 A flow chart of a zero standby state control method provided in an embodiment of the present application. DETAILED DESCRIPTION

[0030] In this application, "at least one" refers to one or more, and "plurality" refers to two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: the existence of A alone, the existence of A and B at the same time, and the existence of B alone, where A and B can be singular or plural. The character " / " generally indicates that the objects associated before and after are in an "or" relationship. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, at least one of a alone, b alone, or c alone can represent: a alone, b alone, c alone, a and b in combination, a and c in combination, b and c in combination, or a, b, and c in combination, where a, b, and c can be single or multiple. In addition, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance.

[0031] The directions or positional relationships indicated by terms such as "center", "longitudinal", "lateral", "up", "down", "left", "right", "front", and "back" are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present application and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limiting the present application.

[0032] The terms "connected" and "connect" should be interpreted broadly. For example, "connected" or "connected" in a circuit structure can refer not only to a physical connection, but also to an electrical connection or a signal connection. For example, it can be a direct connection, i.e., a physical connection, or an indirect connection through at least one intermediate component, as long as the circuit is interconnected. It can also refer to internal connectivity between two components. Signal connection can refer not only to signal connection through circuits but also to signal connection through media, such as radio waves. Those skilled in the art will understand the specific meanings of the above terms in this application on a case-by-case basis.

[0033] Currently, there are zero-standby power supply devices on the market based on the Type-C charging interface. The Type-C charging interface typically includes a CC pin, which is used to determine the direction of the charging device. For power supply devices with a Type-C charging interface, when no charging device is connected, the output voltage of the power supply device is zero. When a charging device is connected, the voltage on the CC pin of the Type-C charging interface of the power supply device will be pulled down. Therefore, for power supply devices with a Type-C charging interface, zero-standby state control can be achieved by changing the voltage on the CC pin. The specific control process is as follows: when the power supply device detects that the voltage on the CC pin of the Type-C charging interface is not pulled down, it assumes that no charging device is connected, at which point it can enter the zero-standby state. When the power supply device is in the zero-standby state, if the voltage on the CC pin of the Type-C charging interface is pulled down, it assumes that a charging device is connected. At this time, the power supply device will be awakened, exit the zero-standby state, and enter the charging state.

[0034] The traditional Type-A interface for charging primarily consists of the VBUS, DP, DM, and GND pins. VBUS and GND are power pins, primarily used to charge the charging device, while the DP and DM pins are used for fast charging protocol communication. Some Type-A interfaces also include an ID pin, which is used for special function expansion in fast charging applications and is also used for fast charging protocol communication in practice. Different brands of charging devices use different pins for fast charging protocol communication, resulting in different signal changes on these pins. Using the ID pin for device insertion detection, due to its lack of universality, would prevent the Type-A interface from implementing device insertion detection. Similarly, most charging devices use the DP and DM pins for fast charging protocol communication when plugged into a charging cable, but some do not. Therefore, implementing device insertion detection using only the DP and DM pins may still cause compatibility issues with some charging devices.

[0035] For the above reasons, compared with the Type-C charging interface, the control method for achieving a zero standby state for a power supply device based on a Type-A charging interface is more complex. Currently, there is no zero standby power supply device based on a Type-A charging interface on the market. To this end, the embodiments of the present application provide a power supply device and a zero standby state control method to provide a zero standby power supply device based on a Type-A charging interface.

[0036] See also Figure 1 , Figure 1 A power supply device 1000 provided in an embodiment of the present application, such as Figure 1 As shown, the device 1000 may include: an AC-DC conversion circuit 100, a load switch 200, a Type-A charging port 300 and a fast charging protocol chip 400.

[0037] See Figure 1 The fast charging protocol chip 400 is electrically connected to the AC-DC conversion circuit 100, the load switch 200, and the Type-A charging port 300 respectively. The AC-DC conversion circuit 100 is electrically connected to the load switch 200, and the load switch 200 is electrically connected to the Type-A charging port 300.

[0038] The fast charging protocol chip 400 is used to obtain the status information of the Type-A charging port 300 after a preset power-on time and when there is no abnormality in itself, and based on the status information, determine whether a charging device is connected to the Type-A charging port. If not, control the load switch 200 to switch from the on state to the off state; it is also used to obtain the small current signal of the Type-A charging port 300 after the load switch 200 is in the off state, and based on the small current signal, determine whether a small current charging device is connected to the Type-A charging port. If so, control the load switch 200 to be in the on state to put the power supply device 1000 into the charging state; if not, control the AC-DC conversion circuit 100 to enter the zero standby state. After the AC-DC conversion circuit 100 enters the zero standby state, control itself to enter the zero standby state to put the power supply device 1000 into the zero standby state.

[0039] The power supply device in this embodiment can specifically be a power adapter or a charging head, and the charging device is a commonly used electronic device with a Type-A charging port, including but not limited to mobile phones, tablets, wearable devices, laptops, etc. The low-current charging device can be a charging cable with an electronic tag, or a combination of a charging cable with an electronic tag and a low-current device, or a combination of a charging cable without an electronic tag and a low-current device. This application does not specifically limit this. The electronic tag can be understood as a chip or circuit unit of the charging cable, but is not limited to marking the voltage or current transmission capacity of the charging cable.

[0040] The power supply device 1000 is used to charge the charging device, wherein the AC-DC conversion circuit 100 is used to convert AC power into DC power and charge the charging device through the load switch 200 and the Type-A charging port 300. The fast charging protocol chip 400 can be understood as the main control chip in the power supply device, which can obtain the signal of the Type-A charging port 300. When the charging device is connected, the fast charging protocol communication is carried out with the fast charging protocol chip 400 based on the Type-A charging port 300. Through protocol negotiation, the fast charging protocol chip 400 controls the AC-DC conversion circuit 100 to output the corresponding voltage and current, and charges the charging device through the load switch 200 and the Type-A charging port 300. The fast charging protocol chip 400 can control the state of the load switch 200. When the load switch 200 is turned on, the voltage and current output by the AC-DC conversion circuit 100 can be output to the outside through the load switch 200 and the Type-A charging port 300; when the load switch 200 is turned off, the voltage and current output by the AC-DC conversion circuit 100 cannot be output to the outside through the load switch 200 and the Type-A charging port 300.

[0041] For power supply devices with a Type-C charging port, the output voltage of the power supply device is zero when no charging device is connected. Unlike the Type-C charging port, the load switch of power supply devices with a Type-A charging port is always in the on state regardless of whether a charging device is connected, so that the Type-A charging port maintains the external voltage output. Because the zero standby state requires the standby power consumption to be less than 5mW, the load switch of the power supply device must be in the off state when entering the zero standby state, and it must be able to effectively detect the connection of the charging device when a charging device is connected.

[0042] For Type-A charging ports, the use of DP pins, DM pins, or ID pins for charging device insertion detection is not universal. However, after being connected to the power supply device, all charging devices will draw a certain amount of current on the VBUS pin, causing the output voltage on the VBUS pin to decrease. Therefore, charging device insertion detection can be achieved through the VBUS pin, which is more universal than implementing charging device insertion detection through the DP pin, DM pin, or ID pin. At present, load insertion detection is basically achieved by detecting the impedance or voltage on the VBUS pin. The specific method of load insertion detection is: when the VBUS pin of the power supply device is in an idle state, the output on the VBUS pin is turned off, and a high-impedance pull-up is added to the VBUS pin. When the charging device is connected, the port capacitance and the device end itself will draw current on the VBUS pin, pulling down the high-impedance pull-up of the power supply device. The power supply device determines whether a charging device is inserted by detecting the low state.

[0043] The fast charging protocol chip is electrically connected to the Type-A charging port. By detecting the VBUS pin, the current drawn by the charging device or the voltage of the VBUS pin can be obtained. By detecting the level changes of the DP pin and the DM pin, it can be determined whether the charging device is in the fast charging protocol communication state.

[0044] The fast charging protocol chip needs to perform internal self-tests and initialization information configuration within a preset time after power-on. The preset time can be set according to user needs, for example, the preset time is 3 seconds. The internal self-test may include checking whether the temperature of the fast charging protocol chip itself is too high or whether the supply voltage is normal.

[0045] After the fast charging protocol chip performs an internal self-test, no abnormal state is triggered, such as excessive temperature or excessive power supply voltage, that is, when there is no abnormality, the status information of the Type-A charging port is obtained, and based on the status information, it is determined whether there is a charging device connected to the Type-A charging port. If no charging device is connected, the load switch is controlled to switch from the on state to the off state, and enter the zero standby state preprocessing process.

[0046] Because in actual applications, the Type-A charging port will be connected to a low-current charging device. For example, when the low-current charging device is a charging cable with an electronic tag, after the charging cable with the electronic tag is connected to the Type-A charging port, a certain amount of current will be drawn on the VBUS pin. This current is usually in the order of uA (microamperes). The above method of judging whether a charging device is connected to the Type-A charging port based on status information cannot accurately judge whether a low-current charging device is connected to the Type-A charging port due to the limited accuracy of the fast charging protocol chip. Therefore, a zero-standby state preprocessing process is required to re-judge whether a low-current charging device is connected to the Type-A charging port.

[0047] The zero standby state preprocessing process includes: obtaining the voltage on the VBUS pin in the Type-A charging port through the fast charging protocol chip after the load switch is in the off state, and obtaining a small current signal based on the built-in software algorithm according to the rate of change of the voltage on the VBUS pin. When the small current signal is received, it is determined that a small current charging device is connected to the Type-A charging port, and the load switch is controlled to be in the on state to put the power supply device into the charging state; if no small current signal is received, it is determined that no small current charging device is connected to the Type-A charging port.

[0048] Among them, the small current signal refers to the current signal generated when a small current charging device is connected to the Type-A charging port. The size of the small current signal is usually in the uA (microampere) level.

[0049] Through the zero standby state preprocessing process, it is re-judged whether there is a low-current charging device connected to the Type-A charging port. When it is determined that there is no low-current charging device connected to the Type-A charging port, the AC-DC conversion circuit is controlled to enter the zero standby state. After the AC-DC conversion circuit enters the zero standby state, the fast charging protocol chip itself is controlled to enter the zero standby state, so that the power supply device enters the zero standby state.

[0050] The zero-standby state preprocessing process can realize the detection of small current charging devices in the uA (microampere) level to ensure that the power supply device will not be disconnected when connected to a small current charging device below 5mA.

[0051] In an embodiment of the present application, after the fast charging protocol chip is powered on for a preset period of time and there is no abnormality in itself, by obtaining the status information of the Type-A charging port, based on the status information, it is determined whether a charging device is connected to the Type-A charging port. When no charging device is connected to the Type-A charging port, the load switch is controlled to switch from the on state to the off state; after the load switch is in the off state, it enters the zero standby state preprocessing process, in which it is detected whether the Type-A charging port is connected to a low-current charging device. When it is detected that a low-current charging device is connected to the Type-A charging port, the load switch is controlled to be in the on state so that the power supply device is in the charging state; when it is not detected that a low-current charging device is connected to the Type-A charging port, the AC-DC conversion circuit is controlled to enter the zero standby state. After the AC-DC conversion circuit enters the zero standby state, the AC-DC conversion circuit is controlled to enter the zero standby state so that the power supply device enters the zero standby state. Through the above process, a zero standby power supply device based on the Type-A charging interface can be provided.

[0052] In a possible embodiment, when the status information includes port current and communication signal: the fast charging protocol chip is used to obtain the port current of the Type-A charging port. When the port current is less than or equal to a preset threshold and no communication signal is received, it is determined that there is no charging device connected to the Type-A charging port, and the load switch is controlled to switch from the on state to the off state.

[0053] The fast charging protocol chip is electrically connected to the Type-A charging port. The fast charging protocol chip includes an ADC (analog to digital converter) circuit. The ADC circuit can sample current signals or voltage signals. By detecting the VBUS pin through the ADC circuit, the current drawn by the charging device or the voltage on the VBUS pin can be obtained. Therefore, by detecting the VBUS pin, the port current drawn by the charging device can be obtained; by detecting the level changes of the DP pin and the DM pin, the communication signal for fast charging protocol communication with the charging device can be obtained. When the fast charging protocol chip receives the communication signal, it is considered that the fast charging protocol chip and the charging device are in the fast charging protocol communication state. When the fast charging protocol chip does not receive the communication signal, it is considered that the fast charging protocol chip and the charging device are not in the fast charging protocol communication state.

[0054] In this embodiment, after the fast charging protocol chip is powered on for a preset period of time and there are no abnormalities in itself, it is determined that the power supply device is in a non-protected state. It then obtains the port current Ibus on the VBUS pin of the Type-A charging port. When the port current Ibus is less than a preset threshold and no communication signal is received, and all the above conditions are met, it is determined that no charging device is connected to the Type-A charging port, and the load switch is controlled to switch from the on state to the off state. Among them, the preset threshold is usually set to a current in the milliampere (mA) level, for example, the preset threshold is 3mA.

[0055] When a charging cable with an electronic tag is connected to a Type-A charging port, a current in the uA (microampere) range is drawn from the VBUS pin. Due to the sampling accuracy limitations of the ADC circuit, if the port current Ibus is less than the sampling accuracy of the ADC circuit, it is impossible to accurately determine whether a charging cable with an electronic tag is connected to the Type-A charging port based on the port current.

[0056] In addition, some charging devices do not support the fast charging protocol. When a charging device that does not support the fast charging protocol is connected to the Type-A charging port, it is impossible to accurately determine whether a charging device that does not support the fast charging protocol is connected to the Type-A charging port based on the communication signal; when a low-current charging device that does not support the fast charging protocol is connected to the Type-A charging port, at this time, the device does not support the fast charging protocol, and the port current Ibus is less than the sampling accuracy of the ADC circuit, it is impossible to determine whether a low-current charging device that does not support the fast charging protocol is connected to the Type-A charging port based on the port current and communication signal.

[0057] Therefore, a zero-standby state preprocessing process is required to re-judge whether a low-current charging device is connected to the Type-A charging port to achieve higher-precision detection to ensure that charging is possible when a low-current charging device is connected and there will be no charging interruption.

[0058] In a possible embodiment, before the fast charging protocol chip enters the zero standby state, the fast charging protocol chip is also used to control the load switch to switch from the off state to the on state when receiving a communication signal, so that the power supply device enters the charging state.

[0059] Before the fast charging protocol chip enters the zero standby state, it will detect the level changes of the DP pin and the DM pin to obtain the communication signal for fast charging protocol communication with the charging device. When the communication signal is received, it is determined that a charging device is connected, or when an abnormal situation occurs, the type of inserted cable changes, etc., the load switch is controlled to switch from the off state to the on state to enable the power supply device to enter the charging state.

[0060] In this embodiment, by detecting the level changes of the DP pin and the DM pin before the fast charging protocol chip enters the zero standby state, it can ensure that no charging device is connected before the fast charging protocol chip enters the zero standby state. It can also immediately return to the charging state when it is detected that a charging device is connected, providing a highly reliable anti-fool mechanism.

[0061] In a possible embodiment, when the power supply device is in the zero standby state, the fast charging protocol chip is also used to obtain the insertion detection voltage of the Type-A charging port. When the insertion detection voltage is lower than the wake-up threshold, it controls itself to exit the zero standby state, so that the power supply device exits the zero standby state and enters the charging state.

[0062] When the power supply device is in the zero standby state, the insertion of the charging device can be detected by the load insertion detection method. At this time, the output on the VBUS pin is turned off, and a high-impedance pull-up is added to the VBUS pin. When the charging device is connected, the high-impedance pull-up of the power supply device will be pulled down. The fast charging protocol chip detects the insertion detection voltage on the VBUS pin. When the voltage is lower than the wake-up threshold, it controls itself to exit the zero standby state, so that the power supply device exits the zero standby state and enters the charging state. Among them, the wake-up threshold Vth is dynamically set. Under normal circumstances, the wake-up threshold Vth is less than 3V. For example, the wake-up threshold Vth is 1V.

[0063] Since the load insertion detection method is performed by setting a wake-up threshold, in actual application scenarios, if the power supply device is connected to a low-current charging device, such as a charging cable with an electronic tag, after the charging cable with an electronic tag is connected to the Type-A charging port, a current of the uA (microampere) level will be drawn on the VBUS pin, causing the voltage on the VBUS pin to decrease. In this case, if the wake-up threshold is set too high, the power supply device will be woken up and exit the zero standby state, resulting in repeated entry and exit of the zero standby state. If the wake-up threshold is set too low, the power supply device cannot be woken up when a low-current charging device is connected, resulting in the low-current charging device being unable to charge.

[0064] In order to solve this problem, in the above embodiment, the zero standby state preprocessing process is used to re-judge whether a low-current charging device is connected to the Type-A charging port. Specifically, after the load switch is in the off state, the voltage on the VBUS pin in the Type-A charging port is obtained. Based on the built-in software algorithm, a low-current signal is obtained according to the rate of change of the voltage on the VBUS pin. When the low-current signal is received, it is considered that a charging cable (or a low-current charging device) with an electronic tag that will draw port current is connected to the Type-A charging port, and the load switch is controlled to be in the on state, so that the power supply device does not enter the zero standby state. The problem of repeatedly entering and exiting the zero standby state is avoided.

[0065] During the zero standby state preprocessing process, that is, before entering the zero standby state, ensure that there are no low-current charging devices connected to the Type-A charging port, such as charging cables with electronic tags that will draw port current. A higher wake-up threshold can be set to achieve more sensitive charging device insertion detection. At the same time, it can avoid the situation where low-current charging devices cannot charge.

[0066] In a possible embodiment, the fast charging protocol chip is used to obtain status information of the Type-A charging port, and based on the status information, determine whether a charging device is connected to the Type-A charging port. If so, control the load switch to be in the on state to put the power supply device into the charging state.

[0067] When a charging device is connected to the Type-A charging port of the power supply device, the load switch is controlled to be in the on state to put the power supply device into the charging state.

[0068] See also Figure 2 , Figure 2 A flowchart for realizing zero standby of a power supply device provided in an embodiment of the present application is as follows: Figure 2As shown in the figure, when a charging device is connected to the Type-A charging port of the power supply device, the power supply device is in the charging state. When the power supply device is in the non-protection state after the preset power-on time, the port current Ibus is less than the preset threshold, and it is not in the fast charging protocol state, and all the above conditions are met, it is determined that there is no charging device connected to the Type-A charging port, and the load switch is controlled to switch from the on state to the off state. At this time, the fast charging protocol chip needs to be configured to the MOS_CLOSE STATE state.

[0069] Enter the zero standby state preprocessing process, during which the Type-A charging port is detected for the connection of a low-current charging device of up to the uA (microampere) level. At this time, the fast charging protocol chip needs to be configured to the PORT CHECK STATE state; when a low-current charging device is detected to be connected to the Type-A charging port, the load switch is controlled to be in the on state to put the power supply device into the charging state; when no low-current charging device is detected to be connected to the Type-A charging port, the AC-DC conversion circuit is controlled to enter the zero standby state. At this time, the fast charging protocol chip is configured to the ACDC ZP STATE state.

[0070] After the AC-DC conversion circuit enters the zero standby state, the fast charging protocol chip itself is controlled to enter the zero standby state. At this time, the fast charging protocol chip is configured to the ZP STATE state to enable the power supply device to enter the zero standby state.

[0071] Before the fast charging protocol chip enters the zero standby state, by detecting the level changes of the DP pin and the DM pin, when it detects that a charging device is connected, it controls the load switch to turn on and returns to the charging state. When the power supply device is in the zero standby state, when it detects that a charging device is connected, it exits the zero standby state and enters the charging state.

[0072] The power supply device provided in the embodiment of the present application uses a high-precision ADC to collect status information of the Type-A charging port, detects whether a charging device is connected to the Type-A charging port, and then uses a small current signal to detect whether a low-current charging device is connected to the Type-A charging port, thereby providing a more comprehensive range of scenario coverage and ensuring that charging can be performed even when a low-current charging device is connected, without charging interruption.

[0073] See also Figure 3 , Figure 3 A zero standby state control method provided in an embodiment of the present application is applied to the above-mentioned power supply device, and the method includes:

[0074] S1, after the preset power-on time and without any abnormality, obtains the status information of the Type-A charging port, and based on the status information, determines whether there is a charging device connected to the Type-A charging port. If not, controls the load switch to switch from the on state to the off state.

[0075] S2, after the load switch is in the off state, obtains the low current signal of the Type-A charging port, and based on the low current signal, determines whether there is a low current charging device connected to the Type-A charging port. If so, controls the load switch to be in the on state to put the power supply device into the charging state.

[0076] S3, if not, control the AC-DC conversion circuit to enter the zero standby state. After the AC-DC conversion circuit enters the zero standby state, control the fast charging protocol chip to enter the zero standby state, so that the power supply device enters the zero standby state.

[0077] In an embodiment of the present application, after the fast charging protocol chip is powered on for a preset period of time and there is no abnormality in itself, it obtains the status information of the Type-A charging port, and based on the status information, determines whether a charging device is connected to the Type-A charging port. When no charging device is connected to the Type-A charging port, the load switch is controlled to switch from the on state to the off state; after the load switch is in the off state, it detects whether a low-current charging device is connected to the Type-A charging port. When it is detected that a low-current charging device is connected to the Type-A charging port, the load switch is controlled to be in the on state to put the power supply device into the charging state; when it is not detected that a low-current charging device is connected to the Type-A charging port, the AC-DC conversion circuit is controlled to enter the zero standby state. After the AC-DC conversion circuit enters the zero standby state, the AC-DC conversion circuit is controlled to enter the zero standby state to put the power supply device into the zero standby state. Through the above process, a zero-standby power supply device based on the Type-A charging interface can be provided.

[0078] In a possible embodiment, when the status information includes port current and communication signal: the above S1 includes: obtaining the port current of the Type-A charging port, and when the port current is less than a preset threshold and no communication signal is received, determining that no charging device is connected to the Type-A charging port, and controlling the load switch to switch from the on state to the off state.

[0079] In the embodiment of the present application, by detecting the size of the port current and the communication signal, it can be determined whether a charging device is connected to the Type-A charging port.

[0080] In a possible embodiment, the method further includes: S4, before the fast charging protocol chip enters the zero standby state, when receiving a communication signal, controlling the load switch to switch from the off state to the on state, so that the power supply device enters the charging state.

[0081] In an embodiment of the present application, before the fast charging protocol chip enters the zero standby state, by detecting the level changes of the DP pin and the DM pin, it can be ensured that no charging device is connected before the fast charging protocol chip enters the zero standby state. It can also immediately return to the charging state when it is detected that a charging device is connected, providing a highly reliable anti-fool mechanism.

[0082] In a possible embodiment, the method also includes: S5, when the power supply device is in the zero standby state, obtaining the insertion detection voltage of the Type-A charging port, and when the insertion detection voltage is lower than the wake-up threshold, controlling the fast charging protocol chip to exit the zero standby state, so that the power supply device exits the zero standby state and enters the charging state.

[0083] In an embodiment of the present application, when the power supply device is in the zero standby state, it is necessary to obtain the insertion detection voltage in real time. When the insertion detection voltage is lower than the wake-up threshold, a higher wake-up threshold can be set to achieve more sensitive charging device insertion detection and control the fast charging protocol chip to quickly exit the zero standby state.

[0084] In a possible embodiment, the method further includes: S6, obtaining status information of the Type-A charging port, and based on the status information, determining whether a charging device is connected to the Type-A charging port; if so, controlling the load switch to be in the on state to put the power supply device into the charging state.

[0085] In an embodiment of the present application, when a charging device is connected to the Type-A charging port, the load switch is controlled to remain in an on state so that the power supply device is in a charging state.

[0086] 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 included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A power supply device, characterized in that: The power supply device includes: an AC-DC conversion circuit, a load switch, a Type-A charging port, and a fast charging protocol chip; The fast charging protocol chip is electrically connected to the AC-DC conversion circuit, the load switch, and the Type-A charging port respectively, the AC-DC conversion circuit is electrically connected to the load switch, and the load switch is electrically connected to the Type-A charging port; The fast charging protocol chip is used to obtain the status information of the Type-A charging port after a preset power-on time and when there is no abnormality in itself, and based on the status information, determine whether the Type-A charging port has a charging device connected. If not, control the load switch to switch from the on state to the off state; it is also used to obtain the small current signal of the Type-A charging port after the load switch is in the off state, and based on the small current signal, determine whether the Type-A charging port has a small current charging device connected. If so, control the load switch to the on state to put the power supply device into the charging state; if not, control the AC-DC conversion circuit to enter the zero standby state. After the AC-DC conversion circuit enters the zero standby state, control itself to enter the zero standby state to put the power supply device into the zero standby state.

2. The power supply device according to claim 1, characterized in that: When the status information includes port current and communication signal: The fast charging protocol chip is used to obtain the port current of the Type-A charging port. When the port current is less than or equal to a preset threshold and the communication signal is not received, it is determined that no charging device is connected to the Type-A charging port, and the load switch is controlled to switch from the on state to the off state.

3. The power supply device according to claim 2, characterized in that: Before the fast charging protocol chip enters the zero standby state, the fast charging protocol chip is also used to control the load switch to switch from the off state to the on state when receiving the communication signal, so that the power supply device enters the charging state.

4. The power supply device according to claim 1, wherein: When the power supply device is in the zero standby state, the fast charging protocol chip is also used to obtain the insertion detection voltage of the Type-A charging port. When the insertion detection voltage is lower than the wake-up threshold, it controls itself to exit the zero standby state, so that the power supply device exits the zero standby state and enters the charging state.

5. The power supply device according to claim 1, characterized in that: The fast charging protocol chip is used to obtain the status information of the Type-A charging port, and based on the status information, determine whether there is a charging device connected to the Type-A charging port. If so, control the load switch to be in the on state to put the power supply device into the charging state.

6. A zero standby state control method, characterized in that: The method is applied to the power supply device according to any one of claims 1 to 5, and the method includes: After a preset power-on time, and without any abnormality, obtaining status information of the Type-A charging port, and determining whether a charging device is connected to the Type-A charging port based on the status information, and if not, controlling the load switch to switch from the on state to the off state; After the load switch is in the off state, a low current signal of the Type-A charging port is obtained, and based on the low current signal, whether a low current charging device is connected to the Type-A charging port is determined, and if so, the load switch is controlled to be in the on state to enable the power supply device to be in the charging state; If not, control the AC-DC conversion circuit to enter the zero standby state. After the AC-DC conversion circuit enters the zero standby state, control the fast charging protocol chip to enter the zero standby state, so that the power supply device enters the zero standby state.

7. The zero standby state control method according to claim 6, characterized in that: When the status information includes port current and communication signal: The acquiring status information of the Type-A charging port, and determining whether a charging device is connected to the Type-A charging port based on the status information, and if not, controlling the load switch to switch from an on state to an off state, includes: The port current of the Type-A charging port is obtained. When the port current is less than a preset threshold and the communication signal is not received, it is determined that no charging device is connected to the Type-A charging port, and the load switch is controlled to switch from an on state to an off state.

8. The zero standby state control method according to claim 7, characterized in that: Before the fast charging protocol chip enters the zero standby state, when the communication signal is received, the load switch is controlled to switch from the off state to the on state, so that the power supply device enters the charging state.

9. The zero standby state control method according to claim 6, characterized in that: When the power supply device is in the zero standby state, the insertion detection voltage of the Type-A charging port is obtained. When the insertion detection voltage is lower than the wake-up threshold, the fast charging protocol chip is controlled to exit the zero standby state, so that the power supply device exits the zero standby state and enters the charging state.

10. The zero standby state control method according to claim 6, characterized in that: Obtain status information of the Type-A charging port, and based on the status information, determine whether a charging device is connected to the Type-A charging port; if so, control the load switch to be in an on state to put the power supply device in a charging state.

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