Power supply control circuit and charging device

Abstract

The utility model provides a power supply control circuit and charging equipment, the power supply control circuit comprises a controller and a plurality of power supply control sub-circuits, the input end of each power supply control sub-circuit is used for being connected with power supply equipment, and the output end of each power supply control sub-circuit is used for being connected with power receiving equipment; the controller is used for controlling the power supply equipment to provide a first voltage for the power receiving equipment through the power supply control sub-circuit if only one power supply control sub-circuit in the plurality of power supply control sub-circuits is connected with the power receiving equipment under the condition that the power supply equipment is detected to be respectively connected with the plurality of power supply control sub-circuits; and if at least two power supply control sub-circuits in the plurality of power supply control sub-circuits are respectively connected with the power receiving equipment, controlling the power supply equipment to respectively provide a second voltage for the connected power receiving equipment through the at least two power supply control sub-circuits. By adopting the circuit, the use of a specific protocol chip is avoided, and the intelligent charging management of multiple power receiving devices can be realized only by utilizing simple circuit design and intelligent management of the controller.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electronics, in particular to a power supply control circuit and a charging device. BACKGROUND

[0002] With the popularity of electronic devices, fast charging technology has become an important aspect of improving user experience. The traditional charging method usually uses a fixed voltage of 5V for charging. Although this method is simple and low in cost, it has obvious shortcomings in charging speed. In order to meet the needs of users for fast charging, various fast charging technologies have emerged, such as Qualcomm's QuickCharge (QC), USB Power Delivery (PD), etc. These fast charging technologies achieve faster charging speed by increasing the charging voltage or increasing the charging current. However, in the related art, due to the existence of various fast charging protocols in the market, different brands and models of powered devices may support different fast charging standards, and specific chips are usually required on the charging device to realize the fast charging function, which undoubtedly increases the cost of the charging device. CONTENT OF THE INVENTION

[0003] In view of the above problems, the present application provides a power supply control circuit and a charging device, which can realize fast charging function without using specific protocol chips through simple circuit design, and can also realize intelligent charging management of multiple powered devices.

[0004] The embodiment of the present application is implemented by adopting the following technical solutions:

[0005] A power supply control circuit, comprising: a controller; a plurality of power supply control sub-circuits, the input end of each power supply control sub-circuit is connected with a power supply device, and the output end is used for being connected with a powered device; the controller is used for controlling the power supply device to provide a first voltage to the powered device through the power supply control sub-circuit when it is detected that only one power supply control sub-circuit of the plurality of power supply control sub-circuits is connected with a powered device, and is used for controlling the power supply device to provide a second voltage to the connected powered device through the at least two power supply control sub-circuits when it is detected that at least two power supply control sub-circuits of the plurality of power supply control sub-circuits are connected with powered devices respectively.

[0006] In an implementable manner, the power supply control circuit further comprises a power supply device interface and a first detection sub-circuit; the input end of each power supply control sub-circuit is connected with the power supply device interface; the first detection sub-circuit is connected between the power supply device interface and the controller, and is used for detecting whether the power supply device interface is connected with a power supply device.

[0007] In an implementation form, the first detection sub-circuit comprises a first resistor, a second resistor and a transistor, a first end of the first resistor is connected with the power supply device interface, a second end of the first resistor is connected with a collector of the transistor, a base of the transistor is connected with the controller, an emitter of the transistor is grounded, a first end of the second resistor is connected between the base of the transistor and the controller, and a second end of the second resistor is grounded.

[0008] In an implementation form, the controller is further configured to control the transistor to be in an off state when it is determined that the power supply device interface is connected with the power supply device according to the voltage of the base of the transistor, and only one power supply control sub-circuit connected with the powered device exists in the plurality of power supply control sub-circuits, and control the power supply device to provide the first voltage to the powered device through the power supply control sub-circuit connected with the powered device.

[0009] In an implementation form, the power supply control circuit further comprises a plurality of powered device interfaces and a plurality of second detection sub-circuits, an output end of each power supply control sub-circuit is connected with one powered device interface respectively, and each second detection sub-circuit is connected with one powered device interface and the controller respectively, and is configured to detect whether the powered device interface is connected with a powered device.

[0010] In an implementation form, the second detection sub-circuit comprises a voltage dividing resistor and a diode, a first end of the voltage dividing resistor is connected with the first power supply, a second end of the voltage dividing resistor is connected with an anode of the diode and the controller respectively, and a cathode of the diode is connected with the powered device interface.

[0011] In an implementation form, the power supply control sub-circuit comprises an electronic switch, an input end of the electronic switch is configured to be connected with the power supply device, an output end of the electronic switch is configured to be connected with the powered device, and a control end of the electronic switch is connected with the controller.

[0012] In an implementation form, the power supply control sub-circuit further comprises a current limiting resistor, the current limiting resistor is connected between the controller and the control end of the electronic switch.

[0013] In an implementation form, the electronic switch comprises a field effect transistor, a source of the field effect transistor is configured to be connected with the power supply device, a gate of the field effect transistor is connected with the controller, and a drain of the field effect transistor is configured to be connected with the powered device.

[0014] In a second aspect, an embodiment of the present application further provides a charging device, comprising a power supply device and a power supply control circuit as described above, and the power supply device is connected with the power supply control circuit.

[0015] The power supply control circuit and the charging device provided by the embodiment of the present application, the power supply control circuit comprises a controller and a plurality of power supply control sub-circuits, the input ends of the plurality of power supply control sub-circuits are respectively used for being connected with power supply devices, the output end of each power supply control circuit is used for being connected with a power receiving device, the controller acquires the access detection result of the power supply device and the output end connection detection result of each power supply control sub-circuit, and when it is determined that the power supply device is connected with the plurality of power supply control sub-circuits respectively, and only one power supply control sub-circuit in the plurality of power supply control sub-circuits is connected with the power receiving device, the power supply device is controlled to provide a first voltage to the power receiving device through the power supply control sub-circuit connected with the power receiving device, so as to ensure that the power receiving device can be safely charged at the fastest speed supported by it, and meanwhile, the maximum charging voltage limit is not exceeded. When it is determined that the power supply device is connected with the plurality of power supply control sub-circuits respectively, and there are at least two power supply control sub-circuits in the plurality of power supply control sub-circuits which are respectively connected with power receiving devices, the power supply device is controlled to provide a second voltage to the connected power receiving devices through the at least two power supply control sub-circuits, so as to realize the simultaneous charging of multiple devices. By using the above circuit, the use of a specific protocol chip is avoided, and the fast charging function of the power receiving device can be realized only by using a simple circuit design and intelligent management of the controller, and meanwhile, the intelligent charging management of multiple power receiving devices can be realized.

[0016] These aspects or other aspects of the present application will be more apparent in the following description of the embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0018] Figure 1 The application module block diagram of the power supply control circuit provided by the embodiment of the present application is shown;

[0019] Figure 2 The application scenario of the circuit principle diagram of the power supply control circuit provided by the embodiment of the present application is shown;

[0020] Figure 3 The principle schematic diagram of the power supply control circuit provided by the embodiment of the present application is shown;

[0021] Figure 4 Another principle schematic diagram of the power supply control circuit provided by the embodiment of the present application is shown;

[0022] Figure 5Fig. 6 shows another principle schematic diagram of the power supply control circuit provided by the embodiment of the present application;

[0023] Figure 6 Fig. 7 shows still another principle schematic diagram of the power supply control circuit provided by the embodiment of the present application;

[0024] Figure 7 Fig. 8 shows an application scenario schematic diagram of the power supply control circuit provided by the embodiment of the present application. DETAILED DESCRIPTION

[0025] The embodiments of the present application are described in detail below, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation of the present application.

[0026] In order to enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below by referring to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0027] As shown in Fig. 1, Figure 1 Fig. 1 schematically shows a power supply control circuit 100 provided by the embodiment of the present application, which includes a controller 110 and a plurality of power supply control sub-circuits 120. Figure 1 The input ends of the plurality of power supply control sub-circuits 120 are connected in parallel and used to be connected with a power supply device 200, and the output end of each power supply control circuit 100 is used to be connected with a powered device 300. Figure 1

[0028] ​The controller 110 is used to acquire the access detection result of the power supply device 200 and the output terminal connection detection result of each of the power supply control sub-circuits 120; if the access detection result determines that the power supply device 200 is connected to multiple power supply control sub-circuits 120 respectively, and the output terminal detection result determines that only one of the multiple power supply control sub-circuits 120 is connected to the powered device 300, the controller controls the power supply device 200 to provide a first voltage to the powered device 300 through the power supply control sub-circuit 120 connected to the powered device 300; if the access detection result determines that the power supply device 200 is connected to multiple power supply control sub-circuits 120 respectively, and the output terminal detection result determines that at least two of the multiple power supply control sub-circuits 120 are connected to the powered device 300 respectively, the controller controls the power supply device 200 to provide a second voltage to the connected powered device 300 through the at least two power supply control sub-circuits 120 respectively.

[0029] The controller 110 may include one or more cores for processing data. The controller 110 uses various interfaces and lines to connect to various parts (e.g., power supply control sub-circuit 120, etc.) included in the entire power supply control circuit 100.

[0030] Optionally, the controller 110 can be implemented using at least one hardware form selected from Digital Signal Processing (DSP), Field-Programmable Gate Array (FPGA), and Programmable Logic Array (PLA). The controller 110 can integrate one or a combination of several of the following: Central Processing Unit (CPU), Graphics Processing Unit (GPU), and modem. It is understood that the aforementioned modem may also be implemented independently of the processor, using a separate communication chip.

[0031] The receiving device 300 can be any device that needs to be charged, such as terminal devices (e.g., mobile phones, tablets, laptops, or smartwatches), medical devices (e.g., electrocardiogram monitors, blood pressure monitors, or portable oxygen concentrators).

[0032] The power supply device 200 can be any device capable of providing electrical energy, such as any device capable of charging the power receiving device 300 through the power supply circuit under the action of the controller 110.

[0033] The power supply device 200 can be one or more of a battery (e.g., a dry battery, a rechargeable battery, etc.), a power adapter (e.g., a power adapter of a terminal device), a solar panel, a generator, etc. The power supply device 200 can be configured to supply a fixed voltage (e.g., 5V, 10V, 12V, 24V, etc.), or a variable voltage within a preset voltage range (e.g., 5V-24V, 5V-36V, etc.).

[0034] The power supply control sub-circuit 120 is configured to establish or disconnect the connection between the power supply device 200 and the powered device 300 under the control of the controller 110. In some scenarios, the power supply control sub-circuit 120 can also perform voltage boosting or voltage reducing on the voltage output by the power supply device 200.

[0035] Please refer to Figure 2 In an embodiment, the power supply device 200 can provide a voltage within a preset voltage range to the powered device 300 through the power supply control sub-circuit 120. The power supply control sub-circuit 120 can include an electronic switch Q1, the input end of the electronic switch Q1 is configured to be connected to the power supply device 200, the output end of the electronic switch Q1 is configured to be connected to the powered device 300, and the control end of the electronic switch Q1 is connected to the controller 110.

[0036] The electronic switch Q1 can be a relay, a transistor, a field effect transistor, etc. Any electronic switch Q1 can be connected to the power supply device 200 and the powered device 300 under the control of the controller 110 to supply power to the powered device 300 through the first voltage.

[0037] It should be understood that when the electronic switch Q1 is a transistor, the transistor can be an NPN transistor or a PNP transistor, which is not limited herein. When the electronic switch Q1 is a field effect transistor, the field effect transistor can be an N-type field effect transistor or a P-type field effect transistor, which is not limited herein.

[0038] In an embodiment, the electronic switch Q1 includes a field effect transistor, the source of the field effect transistor is connected to the power supply device 200, the gate of the field effect transistor is connected to the controller 110, and the drain of the field effect transistor is connected to the powered device 300. By using the above configuration, the controller 110 can control the conduction and cutoff of the field effect transistor through a simple digital signal (high level or low level), so that the control logic is simple and easy to implement.

[0039] In an embodiment, the power supply control sub-circuit 120 further comprises a current-limiting resistor R0 connected between the controller 110 and the control terminal of the electronic switch Q1.

[0040] The current-limiting resistor R0 can slow down the rate of change of the gate voltage (dV / dt), reduce electromagnetic interference (EMI) during switching, and further, the current-limiting resistor R0 and the gate capacitance of the electronic switch Q1 form an RC filter, which can filter out high-frequency noise in the output signal of the controller 110 and ensure the stability of the gate voltage.

[0041] It is worth mentioning that, in order to achieve the power supply device 200 providing a voltage with different voltage values (first voltage and second voltage) to the power receiving device 300 through the power supply control sub-circuit 120, the power supply device 200 can be configured to provide a voltage with variable size within a preset voltage range, or a voltage conversion circuit can be provided in the power supply control sub-circuit 120 to perform voltage boosting or voltage reduction on the voltage provided by the power supply device 200.

[0042] The access detection result is used to indicate whether the power supply device 200 is connected to a plurality of power supply control sub-circuits 120 respectively, and the output terminal of each power supply control sub-circuit 120 is connected to a detection result indicating whether the output terminal of the power supply control sub-circuit 120 is connected to the power receiving device 300.

[0043] In an embodiment, the first voltage and the second voltage can be preset, for example, the first voltage can be 9V, 12V or 24V, etc. which is suitable for charging voltage in fast charging mode, and the second voltage can be 5V, 9V, etc. which is suitable for voltage in normal charging mode, and the specific use scenario of the power supply control circuit 100 is set, which is not limited here. In this case, for example, if the second voltage is 5V, the first voltage can be 9V, 12V or 24V, etc. which is greater than 5V. If the second voltage is 9V, the first voltage is 12V or 24V, etc. which is greater than 9V.

[0044] By adopting the first voltage and the second voltage set in advance, when only one power supply control sub-circuit 120 of the plurality of power supply control sub-circuits 120 is connected with the power receiving device 300, the controller 110 controls the power supply device 200 to charge the power receiving device 300, at this time, the first voltage provided by the power supply device 200, so as to realize fast charging. When the plurality of power receiving devices 300 are simultaneously connected to the plurality of different power supply control sub-circuits 120, the controller 110 ensures that all the power receiving devices 300 can be normally charged by providing the 5V voltage.

[0045] In another implementation manner, the voltage value of the first voltage can be determined according to the maximum charging voltage of the power receiving device 300 connected with one power supply control sub-circuit 120, that is, the controller 110 is further configured to acquire the maximum charging voltage of the power receiving device 300 connected with one power supply control sub-circuit 120; and determine the maximum charging voltage as the first voltage.

[0046] The voltage value of the second voltage can be determined according to the respective charging parameter information of the power receiving devices 300 connected with the at least two power supply control sub-circuits 120.

[0047] For example, the determination manner of the second voltage can be: if the charging parameter information includes the maximum charging voltage and the maximum charging current of the power receiving device 300, the maximum charging voltage with the minimum voltage value among the respective maximum charging voltages of the power receiving devices 300 connected with the at least two power supply control sub-circuits 120 is determined as the second voltage.

[0048] For example, the determination manner of the second voltage can be: if the charging parameter information includes the maximum charging voltage and the maximum charging current of the power receiving device 300, the determination manner of the second voltage can be: if the charging parameter information includes the maximum charging voltage and the maximum charging current of the power receiving device 300, according to the maximum output power of the power supply device 200, the maximum charging voltage and the maximum charging current of the power receiving devices 300 connected with the at least two power supply control sub-circuits 120, the second voltage is determined, the maximum charging voltage of the power receiving devices 300 connected with the at least two power supply control sub-circuits 120 is not less than the second voltage, and the sum of the powers required by the respective power receiving devices 300 when charging by using the second voltage is less than the maximum output power of the power supply device 200.

[0049] By adopting the above manner to set the first voltage and the second voltage, when only one power supply control sub-circuit 120 of the plurality of power supply control sub-circuits 120 is connected with the power receiving device 300, the controller 110 takes the maximum charging voltage of the power receiving device 300 as the first voltage, and controls the power supply device 200 to provide the first voltage to the power receiving device 300 through the power supply control sub-circuit 120 for charging, so as to ensure that the power receiving device 300 can be safely charged at the fastest speed supported by it without exceeding the maximum charging voltage limit. This helps to optimize the charging efficiency of a single device and ensure the safety of the charging process. When a plurality of power receiving devices 300 are simultaneously connected to a plurality of different power supply control sub-circuits 120, the controller 110 determines the second voltage according to the maximum output power of the power supply device 200 and the maximum charging voltage of each power receiving device 300, and controls the power supply device 200 to provide the second voltage to the power receiving devices 300 connected through at least two power supply control sub-circuits 120 for charging, so as to ensure that all power receiving devices 300 can provide power to all connected power receiving devices 300 as fairly and effectively as possible under the limited total power, thereby maximizing the overall charging efficiency and optimizing resource utilization.

[0050] By adopting the above power supply control circuit 100, the first voltage can be provided to the power receiving device 300 when only one power receiving device 300 is connected, so as to ensure that the power receiving device 300 can be safely charged at the fastest speed supported by it without exceeding the maximum charging voltage limit. This helps to optimize the charging efficiency of a single device and ensure the safety of the charging process. When a plurality of power receiving devices 300 are connected, the second voltage is provided to each power receiving device 300 for simultaneous charging of multiple devices, thereby improving the compatibility of the power supply control circuit 100, allowing users to use the same charging device to charge power receiving devices 300 of different brands, reducing the inconvenience of carrying multiple charging devices, and avoiding the problems of complex circuit structure and high cost caused by the need to use specific protocol chips in the related art.

[0051] The power supply control circuit 100 can include a first detection device or a first detection sub-circuit for detecting whether the power supply control sub-circuit 120 is connected with the power supply device 200. The first detection device or the first detection sub-circuit can also be connected with the controller 110, and is configured to send a detection result to the controller 110, wherein the detection result is used to indicate whether the power supply control sub-circuit is connected with the power supply device 200.

[0052] In one possible implementation, the power supply control circuit 100 may further include a second voltage detection device. When the second voltage detection device detects that the voltage at the input terminal of the power supply control sub-circuit 120 changes from a first preset voltage to another voltage value (e.g., 5V, 12V, etc.), it can be determined that the power supply control sub-circuit 120 is connected to the power supply device 200.

[0053] like Figure 3 As shown, in another possible embodiment, the power supply control circuit 100 further includes a first detection sub-circuit 130 and a power supply device interface 140; the input terminals of each power supply control sub-circuit 120 are respectively connected to the power supply device interface 140; the first detection sub-circuit 130 is connected between the power supply device interface 140 and the controller 110, and is used to detect whether the power supply device interface 140 is connected to the power supply device 200.

[0054] It is worth mentioning that, in order to facilitate the connection of the power supply control circuit 100 and the power receiving device 300 respectively, the power supply control circuit 100 also includes a power receiving device interface 150.

[0055] In one possible implementation, the first detection sub-circuit 130 may include a resistor and a comparator. One end of the resistor is connected to the power supply interface 140, and the other end is connected to the positive input terminal of the comparator. The negative input terminal of the comparator is connected to a second power supply that outputs a preset reference voltage.

[0056] In this configuration, if the input of each power supply control sub-circuit 120 is a CC line (Configuration Channel), which is the line used for configuration and communication in the Type-C interface, when each control sub-circuit is not connected to the power supply device 200, the voltage on the CC line is 0V. Correspondingly, the voltage at the positive input of the comparator is also 0V. At this time, the voltage at the positive input of the comparator (0V) is lower than the reference voltage at the negative input (e.g., 1.8V), and the comparator outputs a high level (e.g., 5V). When connected to the power supply device 200, the voltage on the CC line gradually increases. After being divided by the aforementioned resistor, the voltage at the positive input of the comparator also increases (e.g., 3V). The voltage at the positive input of the comparator (3V) is higher than the reference voltage at the negative input (e.g., 1.8V), and the comparator outputs a low level (e.g., 0V).

[0057] The comparator described above can be connected to the controller 110. The controller 110 can determine whether the power supply interface 140 is connected to the power supply device 200 based on the voltage output by the comparator. That is, when the voltage output by the comparator is high, it is determined that the power supply interface 140 is not connected to the power supply device 200; when the voltage output by the comparator is low, it is determined that the power supply interface 140 is connected to the power supply device 200.

[0058] In another implementation, referring to Figure 4 , the first detection sub-circuit 130 comprises a first resistor R1, a second resistor R2 and a transistor Q2, the first resistor R1 has a first end connected with the power supply device interface 140 and a second end connected with the collector of the transistor Q2, the base of the transistor Q2 is connected with the controller 110 and the emitter is grounded, the first end of the second resistor R2 is connected between the base of the transistor Q2 and the controller 110 and the second end is grounded.

[0059] The transistor Q2 can be an NPN transistor or a PNP transistor, which can be set according to actual needs.

[0060] It is worth mentioning that the base voltage of the transistor Q2 needs to be greater than the collector voltage to maintain the conduction state of the transistor Q2. Generally speaking, for an NPN transistor, the base voltage needs to be at least 0.6V-0.7V higher than the emitter.

[0061] Therefore, through the above connection design, when the power supply device interface 140 is not connected with the power supply device 200, the power supply device interface 140 has no voltage, the collector voltage of the transistor Q2 is 0V, and the base voltage is determined by the second resistor R2, which is usually a low voltage (such as 0.7V). At this time, the transistor Q2 is in the cut-off state, and the controller 110 detects the low level to determine that the power supply device interface 140 is not connected with the power supply device 200.

[0062] When the power supply device interface 140 is not connected with the power supply device 200, the voltage on the power supply device interface 140 rises (for example, rises to 5V, 12V or 24V, etc.). At this time, the collector voltage of the transistor Q2 also rises to the same voltage as the power supply device interface 140. Since the collector voltage of the transistor Q2 rises, the base voltage VB of the transistor Q2 also rises after the base B of the transistor Q2 is divided by the second resistor R2. If the base voltage is higher than the threshold voltage (about 0.7V), the transistor Q2 starts to conduct, and after the transistor Q2 conducts, the controller 110 can detect the high level to determine that the power supply device interface 140 is connected with the power supply device 200.

[0063] That is, in this implementation, the controller 110 is further configured to, when it is determined that the power supply device interface 140 is connected with the power supply device 200 according to the voltage of the base of the transistor Q2 and only one of the power supply control sub-circuits 120 is connected with the powered device 300, control the transistor Q2 to be in the cut-off state, and control the power supply device 200 to provide the first voltage to the powered device 300 through the power supply control sub-circuit 120 connected with the powered device 300.

[0064] It is worth mentioning that the transistor Q2 in the first detection sub-circuit 130 can also be replaced by a field-effect transistor. In this case, the source of the field-effect transistor is connected to the controller 110 and the drain is grounded. The first end of the second resistor R2 is connected between the gate of the transistor Q2 and the controller 110.

[0065] It should be understood that the circuit diagram of the first detection sub-circuit 130 described above is only illustrative and may include more components, such as electrical components such as resistors and inductors, without specific limitations here.

[0066] By setting the first detection sub-circuit 130, it is possible to detect whether each power supply control sub-circuit 120 is connected to the power supply equipment 200, so that when connected to the power supply equipment 200, the power supply control circuit 100 can supply power to the power receiving equipment 300.

[0067] The power supply control circuit 100 may further include a second detection device or a second detection sub-circuit for detecting whether the power supply control sub-circuit 120 is connected to the powered device 300. The second detection device or the second detection sub-circuit may also be connected to the controller 110 for sending a detection result to the controller 110 indicating whether the power supply control sub-circuit 120 is connected to the powered device 300.

[0068] like Figure 5 As shown, in one possible implementation, the power supply control circuit 100 further includes a plurality of power receiving device interfaces 150 and a plurality of second detection sub-circuits 160; the output terminal of each power supply control sub-circuit 120 is connected to one of the power receiving device interfaces 150; each of the second detection sub-circuits 160 is connected to one of the power receiving device interfaces 150 and the controller 110, respectively, for detecting whether the power receiving device interface 150 is connected to the power receiving device 300.

[0069] In this embodiment, the second detection sub-circuit 160 may include a resistor and a comparator, wherein one end of the resistor is connected to a first power supply and the second end is connected to a power receiving interface 150, the positive input terminal of the comparator is connected between the resistor and the power receiving interface 150, the negative input terminal is connected to the output terminal of a reference voltage source (e.g., outputting a 2V voltage), and the output terminal is connected to the controller 110.

[0070] When the powered device 300 is not connected, the voltage on the powered device interface 150 is the second voltage (e.g., 5V) provided by the first power supply. At this time, the voltage at the positive input terminal (5V) is greater than the voltage at the negative input terminal (2V), so the comparator is initially at a low level (e.g., 0V). When the powered device 300 is connected, the powered device 300 is connected to the powered device interface 150. The resistor in the powered device 300 can divide the voltage with the charge in the second detection sub-circuit 160, so that the voltage on the powered device interface 150 is less than 5V (e.g., 1.8V). At this time, the voltage at the positive input terminal (1.8V) is less than the voltage at the negative input terminal (2V), so the comparator outputs a high level (e.g., 5V).

[0071] The controller 110 determines whether a powered device 300 is connected to the powered device interface 150 by reading the level signal output by the comparator. Specifically, when the comparator outputs a high level, it is determined that a powered device 300 is connected, and when the comparator outputs a low level, it is determined that a powered device 300 is not connected.

[0072] In another possible implementation, please refer to [reference needed]. Figure 6 As shown, the second detection sub-circuit 160 includes a voltage divider resistor R3 and a diode D1. The first end of the voltage divider resistor R3 is connected to the first power supply, and the second end is connected to the anode of the diode D1 and the controller 110, respectively. The cathode of the diode D1 is connected to the power receiving interface 150.

[0073] In this implementation, if no powered device 300 is connected to the powered device interface 150, the voltage on the powered device interface 150 is 0V. The cathode of diode D1 is 0V, and the anode is connected to the first power supply (5V) through the voltage divider resistor R3. Due to the forward conduction voltage of diode D1 (typically around 0.7V), diode D1 will not conduct. Therefore, the voltage at the second end of the voltage divider resistor R3 (i.e., the input terminal of controller 110) is close to 0V. Controller 110 detects a low level (0V) and determines that the powered device interface 150 is not connected to the powered device 300.

[0074] If a powered device 300 is connected to the powered device interface 150, the voltage on the powered device interface 150 is pulled up to a specific value (e.g., 1.8V). The cathode voltage of diode D1 is 1.8V, and the anode is connected to the first power supply (5V) through the voltage divider resistor R3. Due to the forward conduction voltage of diode D1 (approximately 0.7V), diode D1 conducts. After diode D1 conducts, the voltage at the second end of the voltage divider resistor R3 (i.e., the input terminal of controller 110) is pulled up to a specific value (e.g., 1.1V, i.e., 1.8V - 0.7V). Controller 110 detects the high level (1.1V) and thus determines that a powered device 300 is connected to the powered device interface 150.

[0075] It should be understood that the above-mentioned electrical components included in the second detection sub-circuit 160 are only illustrative, and can also include one or more of resistors, capacitors, inductors, etc., as long as the detection of whether the powered device 300 is connected in the powered detection interface can be realized.

[0076] It is worth mentioning that the power supply device 200 can communicate with the controller 110 through the first detection sub-circuit 130 connected thereto or other communication links, so that the power supply device 200 can send its maximum output power to the controller 110, and the power supply device 200 receives the power supply control instruction of the controller 110 to output the first voltage or the second voltage. Correspondingly, the powered device 300 can also communicate through the second detection sub-circuit connected thereto or other communication links, so that the powered device 300 can send its corresponding charging parameter information (such as maximum charging current or maximum charging voltage, etc.) to the controller 110.

[0077] For example, if the power supply device 200 communicates with the controller 110 through the first detection sub-circuit 130 connected thereto, it can specifically communicate with the controller 110 by using a serial communication protocol, or use an analog signal transmission or carrier communication method to transmit the above-mentioned maximum output power, first voltage or second voltage, etc. If the power supply device 200 communicates with the controller 110 through other communication links, the power supply device 200 and the communication link can communicate by using wireless communication (such as Bluetooth, wifi or Zigbee wireless technology) or Ethernet transmission link, etc. The communication mode between the powered device 300 and the controller 110 can be similar to the communication mode between the power supply device 200 and the controller 110, which will not be described here.

[0078] Please refer to Figure 7 The power supply control circuit 100 includes a power supply device interface 140, a first detection sub-circuit 130, two power supply control sub-circuits 120, two second detection sub-circuits 160, and two powered device interfaces 150. Each powered device interface 150 is taken as an example to illustrate one power supply control sub-circuit 120 and one second detection sub-circuit 160.

[0079] Among them, the first detection sub-circuit 130 includes a first resistor R1, a second resistor R2 and a triode Q2, each second detection sub-circuit 160 includes a voltage dividing resistor R3 and a diode D1, and each power supply control sub-circuit 120 includes an electronic switch Q1.

[0080] The first end of the first resistor R1 is connected with the power supply device interface 140, and the second end is connected with the collector of the transistor Q2. The base of the transistor Q2 is connected with the controller 110, and the emitter is grounded. The first end of the second resistor R2 is connected between the base of the transistor Q2 and the controller 110, and the second end is grounded.

[0081] The second detection sub-circuit 160 includes a voltage dividing resistor R3 and a diode D1. The first end of the voltage dividing resistor R3 is connected with the first power supply, and the second end is connected with the anode of the diode D1 and the controller 110, respectively. The cathode of the diode D1 is connected with the power receiving device interface 150.

[0082] The power supply control sub-circuit 120 includes a field effect transistor and a current limiting resistor R0. The source of the field effect transistor is connected with the power supply device 200, the gate is connected with the controller 110 through the current limiting resistor R0, and the drain is connected with the power receiving device 300.

[0083] The first detection sub-circuit 130 detects whether the power supply device 200 is connected with the power supply device interface 140 through the transistor Q2. The controller 110 monitors the voltage of the base or the collector of the transistor Q2 to determine the connection state of the power supply device 200, so that the subsequent power supply control is only performed when the power supply device 200 is connected with the power supply device interface 140, thereby improving the safety and reliability of the system. The second detection sub-circuit 160 detects the power supply state of the power receiving device 300 through the voltage dividing resistor R3 and the diode D1. The controller 110 monitors the output voltage of the voltage dividing resistor R3 on each second detection sub-circuit 160 to determine whether the power receiving device 300 is normally connected with the power receiving device interface 150. The controller 110 is configured to control the power supply device 200 to provide a first voltage to the power receiving device 300 when it is detected that only one power supply control sub-circuit 120 of the plurality of power supply control sub-circuits 120 is connected with the power receiving device 300, so as to provide a higher voltage for a single power receiving device 300 and ensure that it obtains sufficient power support, thereby improving the power supply efficiency. In addition, the controller 110 is configured to control the first power supply to provide a second voltage to the power receiving device 300 connected with at least two power supply control sub-circuits 120 of the plurality of power supply control sub-circuits 120, so as to provide a lower voltage for multiple power receiving devices 300 and ensure uniform power distribution, thereby avoiding overload and improving the safety of charging multiple power receiving devices 300.

[0084] In addition, the second detection sub-circuit 160 can effectively prevent reverse current by setting the diode D1, thereby protecting the manual device, and the power supply control sub-circuit 120 can effectively prevent excessive upgrade current by setting the current limiting resistor R0, thereby effectively improving the reliability and durability of the circuit, thereby prolonging the service life of the power supply control circuit 100, and making the control logic more flexible and reliable.

[0085] Based on this, the power supply control circuit 100 provided by the embodiments of the present application can provide the first voltage to the powered device 300 when only one powered device 300 is connected, so as to realize the fast charging mode, and provide the second voltage to each powered device 300 when multiple powered devices 300 are connected, so as to realize the simultaneous charging of multiple devices, thereby improving the compatibility and safety of the power supply control circuit 100, and the user can use the same charging device to charge powered devices 300 of different brands, reducing the inconvenience of carrying multiple charging devices, and avoiding the problems of complex circuit structure and high cost caused by the need to use a specific protocol chip in the related art.

[0086] Please refer to Figure 1 The embodiments of the present application also provide a charging device, which comprises the power supply device 200 and the power supply control circuit 100, wherein the power supply device 200 is connected with the power supply control circuit 100.

[0087] The charging device is used to charge the powered device 300, and the specific description of the power supply device 200, the powered device 300 and the power supply control circuit 100 in the charging device can be referred to the specific description of the foregoing embodiments, which will not be repeated here.

[0088] The above is only the preferred embodiment of the present application, and does not limit the present application in any form. Although the preferred embodiment of the present application has been disclosed as above, it is not intended to limit the present application. Any person skilled in the art can make some changes or modifications to the above disclosed technical content to obtain equivalent embodiments with equivalent changes, without departing from the technical solution of the present application. Any simplification, modification, equivalent change and modification of the above embodiments made according to the technical essence of the present application are still within the scope of the technical solution of the present application.

Claims

1. A power supply control circuit, characterized by comprising: The application relates to a power supply control circuit. The power supply control circuit comprises a controller, a plurality of power supply control sub-circuits, an interface for connecting with a power supply device, and a first detection sub-circuit. The input end of each power supply control sub-circuit is connected with the interface for connecting with a power supply device. The first detection sub-circuit is connected between the interface for connecting with a power supply device and the controller. The first detection sub-circuit comprises a first resistor, a second resistor and a transistor.

2. The power supply control circuit of claim 1, wherein, The first end of the first resistor is connected with the interface for connecting with a power supply device, the second end of the first resistor is connected with the collector of the transistor, the base of the transistor is connected with the controller, the emitter of the transistor is grounded, the first end of the second resistor is connected between the base of the transistor and the controller, and the second end of the second resistor is grounded. The controller is further configured to determine whether the interface for connecting with a power supply device is connected with a power supply device according to the voltage of the base of the transistor. The controller is further configured to control the transistor to be in an off state when the interface for connecting with a power supply device is connected with a power supply device and only one power supply control sub-circuit is connected with a powered device.

3. The power supply control circuit of claim 2, wherein, The power supply control circuit further comprises a plurality of powered device interfaces and a plurality of second detection sub-circuits.

4. The power supply control circuit of claim 3, wherein, The output end of each power supply control sub-circuit is connected with one powered device interface.

5. The power supply control circuit of claim 1, wherein, Each second detection sub-circuit is connected with one powered device interface and the controller. The second detection sub-circuit comprises a voltage dividing resistor and a diode. The power supply control sub-circuit comprises an electronic switch.

6. The power supply control circuit of claim 5, wherein, The electronic switch comprises a field effect transistor.

7. The power supply control circuit of claim 1, wherein, The source of the field effect transistor is connected with a power supply device.

8. The power supply control circuit of claim 7, wherein, The gate of the field effect transistor is connected with the controller.

9. The power supply control circuit of claim 7, wherein, The drain of the field effect transistor is connected with a powered device.

10. A charging device, characterized by The power supply device and the power supply control circuit as claimed in any one of claims 1 to 9 are included.

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