Charging circuit and charging device

Abstract

The utility model discloses a charging circuit and charging equipment, charging circuit includes input interface, has the power input end and first communication end for accessing adapter, a plurality of output interfaces, and output interface is used for accessing the equipment of waiting to charge, main control circuit, and main control circuit is connected with a plurality of output interfaces respectively, power transmission circuit, and the input of power transmission circuit is connected with input interface, and the output of power transmission circuit is connected with a plurality of output interfaces respectively, and power transmission circuit is used to transmit the power of input interface input to output interface, switch switching circuit, and switch switching circuit has first connection end and a plurality of second connection end, and first connection end is connected with the first communication end of input interface, and a plurality of second connection end and a plurality of output interfaces one to one corresponding connection, and the controlled end of switch switching circuit is connected with main control circuit, the utility model aims at realizing that adapter carries out high -power fast -charging to the equipment of waiting to charge through one turns to many data lines.

Description

Technical Field

[0001] This utility model relates to the field of charging technology, and in particular to a charging circuit and charging device. Background Technology

[0002] With the increasing number of users with multiple devices, one-to-many USB-C data cables (such as 1C to 2C) are becoming more and more popular. Currently, these cables generally have a built-in relay PCBA board for protocol conversion and power distribution.

[0003] However, the repeater board isolates the direct communication between the device and the power adapter. Since the proprietary fast charging protocols of mobile phone brands on the market rely on dedicated signals on the DP / DM line for handshaking, and the repeater board cannot recognize or transmit these signals, the device can only use general low-power fast charging and cannot trigger the original manufacturer's high-power fast charging. Utility Model Content

[0004] The main purpose of this invention is to propose a charging circuit and charging device, which aims to enable the adapter to perform high-power fast charging of the device to be charged through a one-to-multiple data cable.

[0005] To achieve the above objectives, this utility model proposes a charging circuit, comprising: The input interface has a power input terminal for connecting an adapter and a first communication terminal; Multiple output interfaces, which are used to connect to the device to be charged; A main control circuit, which is electrically connected to the plurality of output interfaces respectively; A power transmission circuit, wherein the input terminal of the power transmission circuit is connected to the input interface, the output terminal of the power transmission circuit is connected to a plurality of the output interfaces respectively, and the power transmission circuit is also connected to the main control circuit, and the power transmission circuit is used to transmit the power input by the input interface to the output interface; A switch switching circuit has a first connection terminal and multiple second connection terminals. The first connection terminal is connected to the first communication terminal of the input interface, and the multiple second connection terminals are connected to the multiple output interfaces one by one. The controlled terminal of the switch switching circuit is connected to the main control circuit. The main control circuit is used to control the switch switching circuit to open the path between the output interface of the single device to be fast charged and the first communication terminal of the input interface when it detects that a single device to be fast charged is connected to the output interface and outputs a fast charging demand signal, so as to establish a communication path between the device to be fast charged and the first communication terminal of the adapter, so that the adapter charges the device to be fast charged through the path between the power input terminal of the input interface and the output interface.

[0006] In one embodiment, the power delivery circuit includes: A step-down circuit, wherein the input terminal of the step-down circuit is connected to the input interface, and the step-down circuit is used to step down the voltage input to the input interface and then output it. Multiple first switching circuits are provided, the input terminals of which are connected to the output terminals of the step-down circuit, the output terminals of which are connected to the output interfaces one by one, and the controlled terminals of which are connected to the main control circuit. The charging circuit also includes: Multiple second switching circuits are provided, with the input terminals of the second switching circuits connected to the power input terminals of the input interfaces, the output terminals of the multiple second switching circuits being connected one-to-one with the multiple output interfaces, and the controlled terminals of the second switching circuits being connected to the main control circuit. The main control circuit is used to control the second switch circuit connected to the output interface of the single device to be fast charged to be turned on when it detects that a single device to be fast charged has been connected to the output interface and outputs a fast charging demand signal, and to control the first switch circuit connected to the output interface of the single device to be fast charged to be turned off.

[0007] In one embodiment, the input interface further has a second communication terminal for connecting to an adapter, and the main control circuit is also connected to the second communication terminal of the input interface to establish a communication path with the adapter; The main control circuit is used to control the second switch circuit connected to the output interface of the device to be fast-charged to turn on and control the first switch circuit connected to it to turn off when it detects that the adapter and the fast-charging demand signal output by the device to be fast-charged are successfully matched.

[0008] In one embodiment, the second switching circuit includes a first switching transistor and a first resistor. The input terminal of the first switching transistor is connected to the input interface, the output terminal of the first switching transistor is connected to the output interface, the controlled terminal of the first switching transistor is connected to the first terminal of the first resistor, and the second terminal of the first resistor is connected to the main control circuit. The first switching circuit includes: The circuit comprises a second switch, a third switch, a second resistor, and a third resistor. The input terminal of the second switch is connected to the output terminal of the step-down circuit. The output terminal of the second switch is connected to the output terminal of the third switch and the first terminal of the second resistor. The input terminal of the third switch is connected to the output interface. The controlled terminals of the second and third switches and the second terminal of the second resistor are all connected to the first terminal of the third resistor. The second terminal of the third resistor is connected to the main control circuit.

[0009] In one embodiment, the device to be charged has a communication pin, and the main control circuit is used to establish a communication connection with the device to be charged when the communication pin of the device to be charged is connected to the output interface; The main control circuit is used to control the switch switching circuit to open the communication path between the output interface of the single device to be fast charged and the first communication terminal of the input interface when it detects that the communication pin of a single device to be fast charged is connected to the output interface and outputs a fast charging demand signal. The main control circuit is also used to control the switch switching circuit to disconnect the communication path between the first communication terminal of the multiple output interfaces and the input interface when it is detected that the communication pins of at least two devices to be charged are connected to the corresponding output interfaces.

[0010] In one embodiment, the device to be charged has a communication pin, and the main control circuit is used to establish a communication connection with the device to be charged when the communication pin of the device to be charged is connected to the output interface; the input interface also has a second communication terminal for connecting to an adapter, and the main control circuit is also connected to the second communication terminal of the input interface to establish a communication path with the adapter; The main control circuit is used to adjust the voltage output by the step-down circuit when it receives the power request signal output by the communication pin of the device to be charged and the total power signal output by the adapter.

[0011] In one embodiment, the device to be charged has a communication pin, and the main control circuit is used to establish a communication connection with the device to be charged when the communication pin of the device to be charged is connected to the output interface; The main control circuit is used to control the first switch circuit connected to the output interface of the device with the largest requested voltage to be turned on and the second switch circuit connected to it to be turned off when multiple devices to be charged are detected to have their communication pins connected to the corresponding output interface and output different requested voltage requirements. And control the second switch circuit connected to the output interface of the other devices to be charged to be turned on, and control the first switch circuit connected to it to be turned off.

[0012] In one embodiment, the device to be charged has a communication pin, and the main control circuit is used to establish a communication connection with the device to be charged when the communication pin of the device to be charged is connected to the output interface; The main control circuit is used to control the first switch circuit connected to the output interface of the multiple devices to be charged to be turned on and the second switch circuit connected to the output interface to be turned off when multiple communication pins of multiple devices to be charged are detected to be connected to the corresponding output interface and output multiple identical request voltage requirements.

[0013] In one embodiment, the input interface further has a second communication terminal. The power input terminal, the first communication terminal, and the second communication terminal of the input interface are all used to connect to a host computer. The main control circuit is also connected to the second communication terminal of the input interface. The main control circuit is used to control the switch switching circuit to open the path between the output interface connected to the device to be charged and the first communication terminal of the input interface when it detects that the input interface is connected to the host computer and the device to be charged is connected to the output interface, so as to establish a communication path between the device to be charged and the host computer.

[0014] This utility model also proposes a charging device, including the charging circuit described in any of the above claims.

[0015] This utility model's charging circuit includes an input interface with a power input terminal for connecting an adapter and a first communication terminal; multiple output interfaces for connecting devices to be charged; a main control circuit electrically connected to the multiple output interfaces; a switch switching circuit having a first connection terminal and multiple second connection terminals, the first connection terminal being connected to the first communication terminal of the input interface, and the multiple second connection terminals being connected one-to-one with the multiple output interfaces; the controlled terminal of the switch switching circuit being connected to the main control circuit; the main control circuit, when detecting that a single device to be fast-charged has connected to an output interface and outputs a fast-charging demand signal, controls the switch switching circuit to open the path between the output interface of the single device to be fast-charged and the first communication terminal of the input interface, thereby establishing a communication path between the device to be fast-charged and the first communication terminal of the adapter. At this time, the device to be fast-charged outputs a private fast-charging protocol signal to the adapter, so that the adapter outputs a high-power power supply corresponding to the private fast-charging protocol through the path between the first communication terminal of the input interface and the output interface to charge the device to high power. With this configuration, in practical applications, compared to existing one-to-many data cables, when the charging circuit of this utility model is applied to one-to-many data cables, it can achieve high-power fast charging of the devices to be fast charged, thereby significantly shortening the charging time of the devices to be fast charged and improving the user experience. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of a module according to an embodiment of the present invention; Figure 2 This is a schematic diagram of a module according to another embodiment of the present utility model; Figure 3 This is a schematic diagram of the circuit structure of an embodiment of the present invention; Figure 4 This is a schematic diagram of a module according to another embodiment of the present invention; Figure 5 This is a schematic diagram of a module according to another embodiment of the present invention.

[0018] Explanation of icon numbers: 10. Main control circuit; 20. Power transmission circuit; 21. Step-down circuit; 22. First switching circuit; 30. Switching circuit; 40. Second switching circuit.

[0019] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0021] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0022] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0023] With the widespread use of smartphones, tablets, and other mobile devices, users' demand for efficient and convenient multi-device charging continues to grow. One-to-many USB-C data cables (such as 1C to 2C, 1C to 3C, etc.) have become one of the mainstream accessories in the market due to their advantages such as saving ports and portability. Currently, these multi-port data cables generally use built-in repeaters to achieve USB protocol conversion, power distribution, and port expansion functions.

[0024] However, existing relay solutions have significant technical bottlenecks: the relay board, acting as a communication intermediary between the device and the power adapter, forces all signals (including CC and DP / DM lines) to be processed by it before being forwarded, resulting in a lack of direct physical communication path between the terminal device and the power supply. While this isolation mechanism can support the negotiation of the standard USB PD protocol, it severely hinders the normal triggering of proprietary high-power fast charging protocols.

[0025] Specifically, proprietary fast charging protocols rely on specific analog voltages or timing signals on the DP / DM line for point-to-point handshakes, and relay chips cannot transmit or accurately reproduce such non-standard signals. Therefore, when a user connects a phone that supports proprietary fast charging protocols to such a one-to-many data cable, the system can only fall back to the general low-power fast charging mode and cannot activate the manufacturer-defined high-power fast charging function, significantly reducing charging efficiency and user experience.

[0026] To solve the above problems, this utility model proposes a charging circuit, with reference to... Figure 1 In one embodiment, the charging circuit includes: The input interface has a power input terminal for connecting an adapter and a first communication terminal; Multiple output interfaces, which are used to connect to the device to be charged; The main control circuit 10 is electrically connected to the plurality of output interfaces respectively; The power transmission circuit 20 has its input terminal connected to the input interface and its output terminal connected to multiple output interfaces. The power transmission circuit 20 is also connected to the main control circuit 10. The power transmission circuit 20 is used to transmit the power input from the input interface to the output interface. A switch switching circuit 30 has a first connection terminal and multiple second connection terminals. The first connection terminal is connected to the first communication terminal of the input interface, and the multiple second connection terminals are connected to the multiple output interfaces one by one. The controlled terminal of the switch switching circuit 30 is connected to the main control circuit 10. The main control circuit 10 is used to control the switch switching circuit 30 to open the path between the output interface of the single device to be fast charged and the first communication terminal of the input interface when a single device to be fast charged is detected to be connected to the output interface and output a fast charging demand signal, so as to establish a communication path between the device to be fast charged and the first communication terminal of the adapter, so that the adapter can charge the device to be fast charged through the path between the power input terminal of the input interface and the output interface.

[0027] In this embodiment, the device to be charged has a communication pin for outputting communication signals. The communication pin is used to connect to the communication port on the output interface. When the main control circuit 10 receives the communication signal output by the device to be charged and identifies that the device to be charged is connected to the output interface, it first controls the power transmission circuit 20 to charge the device to be charged according to a common low-power fast charging protocol such as the USB PD (PowerDelivery) protocol, so as to meet the normal power supply of the device to be charged in the first time. Subsequently, the number of connected devices to be charged is detected. When only one device is detected connected to the output interface, a VDM (Manufacturer Custom Message) packet is sent to obtain the device identification information of the device. The device identification code is either the VID (Manufacturer Identification Code) or PID (Product Identification Code) information of the device. The main control circuit 10 compares the device identification code with the pre-stored device identification code. When they match, the main control circuit 10 determines that the device to be charged is a device to be fast charged and controls the switch switching circuit 30 to conduct the communication path between the adapter and the device to be charged. This allows the device to input its private fast charging protocol to the adapter. After receiving the private fast charging protocol, the adapter outputs a corresponding high-power power supply through the power input terminal of the input interface to charge the device to be fast charged, thereby improving the charging efficiency of the device to be fast charged. The fast charging demand signal is the private fast charging protocol output by the device to be fast charged.

[0028] It should be noted that the main control circuit 10 can determine the number of connected devices to be charged based on the number of received communication signals. Since the multiple communication pins of the main control circuit 10 are connected one-to-one with each output interface, the main control circuit 10 can accurately identify the output interface from which each communication signal originates based on the preset communication pin-output interface mapping relationship, and thus control the switch switching circuit 30 to conduct the communication path between the first communication terminal of the input interface and the corresponding output interface according to the source of the device identification signal.

[0029] In this embodiment, the main control circuit 10 can be implemented using a main controller, such as an MCU (Microcontroller Unit), a DSP (Digital Signal Processor), an FPGA (Field Programmable Gate Array), or a SOC (System On Chip).

[0030] In this embodiment, the switch switching circuit 30 can be implemented using a single-pole multi-throw (SPMWTO) switch. The common terminal of the SPMWTO is connected to the first communication terminal of the input interface, and the multiple normally open terminals of the SPMWTO are connected one-to-one with the multiple output interfaces. The main control circuit 10 is used to control the common terminal of the SPMWTO to conduct with the corresponding normally open terminal when a single device to be fast-charged is detected to be connected to the output interface and output a fast-charging demand signal, so as to establish a communication path between the device to be fast-charged and the adapter. The switch switching circuit 30 can also be implemented using multiple switching components, such as MOSFETs, IGBTs, thyristors, transistors, power transistors, etc., and / or contactors, circuit breakers, and relays. Each switching component is connected in series between the first communication terminal of the input interface and the multiple output interfaces. The main control circuit 10 is used to control the corresponding switching component to conduct when a single device to be fast-charged is detected to be connected to the output interface and output a fast-charging demand signal, so as to establish a communication path between the device to be fast-charged and the adapter.

[0031] In this embodiment, optionally, the power transmission circuit 20 can be implemented using multiple switching components. These multiple switching components are respectively disposed on the charging path between the power input terminal of the input interface and multiple output interfaces. The main control circuit 10 is used to control the corresponding switching component to conduct when a device to be charged is detected connected to an output interface, so that the adapter charges the device to be charged. Optionally, the power transmission circuit 20 can be implemented using multiple buck circuits. These multiple buck circuits are respectively disposed on the charging path between the input interface and multiple output interfaces. The main control circuit 10 can control the output voltage of the corresponding buck circuit according to the power request signal output by the device to be charged, so as to meet the charging requirements of the corresponding device to be charged.

[0032] With the above settings, in practical applications, compared with existing one-to-many data cables, when the charging circuit of this utility model is applied to one-to-many data cables, it can realize high-power fast charging of the devices to be fast charged, thereby greatly shortening the charging time of the devices to be fast charged and improving the user experience.

[0033] Existing one-to-many data cables incorporate a step-down circuit in the charging loop between the input interface and multiple output interfaces. This circuit is used to meet the low-voltage charging needs of the device by controlling the step-down amplitude, and to meet the high-voltage charging needs of the device by controlling the step-down amplitude. However, due to the inherent energy conversion losses in the step-down circuit, the electrical energy output from the adapter undergoes efficiency loss after conversion, thereby reducing the actual charging efficiency for the device.

[0034] To solve the above-mentioned technical problems, in one embodiment of this utility model, reference is made to... Figure 2 The charging circuit further includes: A step-down circuit 21 is provided, the input terminal of which is connected to the input interface. The step-down circuit 21 is used to step down the voltage input to the input interface and then output it. Multiple first switching circuits 22 are provided, the input terminals of which are connected to the output terminals of the voltage conversion module, the output terminals of which are connected to the output interfaces one by one, and the controlled terminals of which are connected to the main control circuit 10. The charging circuit also includes: Multiple second switching circuits 40 are provided, with their input terminals connected to the power input terminals of the input interfaces, their output terminals connected one-to-one with the output interfaces, and their controlled terminals connected to the main control circuit 10.

[0035] In this embodiment, the step-down circuit 21 can be any one of a asynchronous Buck circuit, a non-synchronous Buck circuit, or a Buck-Boost circuit. The first switching circuit 22 and the second switching circuit 40 can be implemented using at least one switching transistor, such as a MOSFET, IGBT, thyristor, transistor, power transistor, etc., and / or using at least one switching device, such as a contactor, circuit breaker, and relay. In a preferred embodiment, refer to... Figure 3The first switching circuit 22 includes a second switch Q2, a third switch Q3, a second resistor R2, and a third resistor R3. The input terminal of the second switch Q2 is connected to the output terminal of the buck circuit 21. The output terminal of the second switch Q2 is connected to the output terminal of the third switch Q3 and the first terminal of the second resistor R2. The input terminal of the third switch Q3 is connected to the output interface. The controlled terminals of the second switch Q2, the third switch Q3, and the second terminal of the second resistor R2 are all connected to the first terminal of the third resistor R3. The second terminal of the third resistor R3 is connected to the main control circuit 10. The second switch Q2 and the third switch Q3 are both MOSFETs, forming a back-to-back bidirectional MOSFET circuit. This back-to-back bidirectional MOSFET circuit prevents current from the output interface from flowing back into the buck circuit 21, thus avoiding damage to the buck circuit 21 due to backflow current.

[0036] The second switching circuit 40 includes a first switching transistor Q1 and a first resistor R1. The input terminal of the first switching transistor Q1 is connected to the input interface, the output terminal of the first switching transistor Q1 is connected to the output interface, the controlled terminal of the first switching transistor Q1 is connected to the first end of the first resistor R1, and the second end of the first resistor R1 is connected to the main control circuit 10. The main control circuit 10 turns the path between the input interface and the output interface on / off through the first switching transistor Q1.

[0037] In this embodiment, the main control circuit 10 is used to control the second switch circuit 40 connected to the output interface of the single device to be fast-charged to be turned on and the first switch circuit 22 connected to the output interface of the single device to be fast-charged to be turned off when a fast-charging demand signal is detected to be connected to the output interface. With this configuration, compared to existing one-to-many data cables, when the charging circuit of this invention is applied to a one-to-many data cable, the power output by the adapter according to the fast-charging demand signal can be directly output to the device to be fast-charged, avoiding the conversion loss of the step-down circuit 21 and improving the charging efficiency of the device to be fast-charged.

[0038] The main control circuit 10 is also used to, when detecting that a non-fast-charging device is connected to the output interface, control the corresponding connection of the output interface of the non-fast-charging device to the first switch circuit 22 to be turned on, and control the step-down circuit 21 to step down the voltage input to the input interface and output it to the output interface of the device to be charged, so that the step-down circuit 21 can charge the non-fast-charging device through a common charging protocol such as PD (Power Delivery) protocol / PPS (Programmable Power Supply) protocol, to ensure that the non-fast-charging device can be charged normally. In addition, the main control circuit 10 is also used to, when detecting that the communication pins of at least two devices to be charged are connected to the corresponding output interface, control the switch switching circuit 30 to disconnect the communication path between the first communication terminal of the multiple output interfaces and the input interface, so as to stop the adapter from fast-charging the device to be charged, ensuring that the power distribution of the charging circuit of this utility model to multiple devices to be charged is stable, and avoiding the situation where other devices to be charged cannot get enough charging power when the adapter is fast-charging the device to be charged at high power.

[0039] It should be noted that when the adapter receives the proprietary fast charging protocol output by the device to be fast charged, there may be a problem of unsuccessful matching of the proprietary fast charging protocol, preventing the adapter from performing high-power fast charging on the device. To address this, in one embodiment, refer to... Figure 4 The input interface also has a second communication terminal for connecting to the adapter. The main control circuit 10 is also connected to the second communication terminal of the input interface to establish a communication path with the adapter. It should be noted that when the adapter successfully hands over with the proprietary fast charging protocol, it outputs a matching success signal to the main control circuit 10 via the second communication terminal of the input interface. This causes the main control circuit 10 to control the second switching circuit 40 connected to the output interface of the device to be fast charged to be turned on, and to control the first switching circuit 22 connected to be turned off, so that the adapter outputs high-power power to fast charge the device. When the adapter fails to hand over with the proprietary fast charging protocol, it outputs a matching failure signal to the main control circuit 10. This causes the main control circuit 10 to control the first switching circuit 22 connected to the output interface of the device to be fast charged to be turned on, and to control the second switching circuit 40 connected to be turned off. It also controls the step-down circuit 21 to charge the device according to a common fast charging protocol such as PD (Power Delivery) or PPS (Programmable Power Supply), ensuring that the device can be charged normally even when fast charging is unavailable.

[0040] In one embodiment of this invention, the main control circuit 10 is used to, when detecting that multiple devices to be charged have their communication pins connected to the corresponding output interfaces and output different requested voltage requirements, control the first switch circuit 22 connected to the output interface of the device with the highest requested voltage requirement to be turned on, and control the corresponding second switch circuit 40 to be turned off; and control the second switch circuit 40 connected to the output interfaces of the remaining devices to be charged to be turned on, and control the corresponding first switch circuit 22 to be turned off. With this configuration, this invention intelligently allocates power supply paths according to the priority of requested voltage requirements, ensuring that high-voltage devices receive the most efficient direct power supply when multiple ports output simultaneously, while other devices use a step-down path, thereby achieving optimal energy efficiency allocation under limited total power.

[0041] It is important to consider that existing one-to-many data cables require multiple step-down circuits 21 to output the same voltage to charge multiple devices with the same power demand. Multiple step-down circuits 21 not only increase the overall size of the one-to-many data cable, limiting its application scenarios, but also increase its overall cost, thus reducing its market competitiveness. In one embodiment of this invention, the main control circuit 10, when detecting that multiple devices' communication pins are connected to the corresponding output interfaces and output multiple identical voltage requests, controls the first switch circuit 22 connected to the output interfaces of the multiple devices to be charged to be turned on, and the corresponding second switch circuit 40 to be turned off. With this configuration, compared to existing one-to-many data cables, this invention can meet the identical charging needs of multiple devices by controlling only a single step-down circuit 21, eliminating the need for multiple step-down circuits 21. This reduces the overall size and cost of the charging circuit, making it beneficial for miniaturization of one-to-many data cables and improving their market competitiveness.

[0042] In one embodiment of this utility model, the main control circuit 10 is used to adjust the voltage output of the step-down circuit 21 upon receiving a power request signal output from the communication pin of the device to be charged and a total power signal output by the adapter. Specifically, the main control circuit 10 is used to determine the maximum power that the adapter can output based on the total power signal, and also to determine the charging voltage / charging current requirement of the device to be charged based on the power request signal output by the device to be charged. The main control circuit 10 allocates the maximum power of the adapter according to a preset power allocation strategy and the charging voltage / charging current requirement of the device to be charged, and controls the output voltage of the step-down circuit 21 according to the allocation result, so that multiple devices to be charged can receive reasonable charging power allocation.

[0043] In an exemplary embodiment, assuming there are two output interfaces and the adapter's maximum output power is 67W, when the first and second devices to be charged are connected to the two output interfaces respectively, if the voltage requested by the first and second devices to be charged is greater than or equal to 20V, or less than 20V, then 30W of output power can be allocated to charge the two devices to be charged respectively, and the first switching circuit 22 connected to the two output interfaces is controlled to be turned on. The output voltage of the step-down circuit 21 is also controlled according to the 30W output power so that the two devices to be charged can receive a reasonable charging power allocation.

[0044] If one of the first and second devices to be charged requests a voltage greater than or equal to 20V, while the other requests a voltage less than 20V, 40W of output power can be allocated to charge the high-power device (requesting a voltage greater than or equal to 20V), and 25W of output power can be allocated to charge the low-power device (requesting a voltage less than 20V). In this case, the main control circuit 10 controls the first switching circuit 22 connected to the output interface of the low-power device to be charged to be turned on, and controls the output voltage of the step-down circuit 21 according to the 25W output power to meet the charging needs of the low-power device. The main control circuit 10 also controls the second switching circuit 40 connected to the output interface of the high-power device to be charged to be turned on, so that the adapter outputs 40W of charging power to charge the high-power device.

[0045] In one embodiment of this utility model, reference is made to Figure 5 The input interface also has a second communication terminal. The power input terminal, the first communication terminal, and the second communication terminal of the input interface are all used to connect to a host computer. The main control circuit 10 is also connected to the second communication terminal of the input interface. The main control circuit 10 is used to control the switch switching circuit 30 to open the path between the output interface connected to the device to be charged and the first communication terminal of the input interface when it detects that the input interface is connected to the host computer and the device to be charged is connected to the output interface, so as to establish a communication path between the device to be charged and the host computer.

[0046] Specifically, when the host computer connects to the input interface, it outputs a corresponding data flag signal to the main control circuit 10. Upon receiving the data flag information, the main control circuit 10 determines that the device connected to the input interface is the host computer and controls the switch switching circuit 30 to establish a communication path between the device to be charged and the host computer, enabling data transmission between them. This configuration allows the charging circuit of this invention to not only quickly charge the device but also transmit data between the host computer and the device, improving the versatility of the charging circuit and the user experience.

[0047] This utility model also proposes a charging device, including the charging circuit described above.

[0048] It is worth noting that since the charging device of this utility model is based on the charging circuit described above, the embodiments of the charging device of this utility model include all the technical solutions of all the embodiments of the charging circuit described above, and the technical effects achieved are exactly the same, so they will not be repeated here.

[0049] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A charging circuit, characterized in that, include: The input interface has a power input terminal for connecting an adapter and a first communication terminal; Multiple output interfaces, which are used to connect to the device to be charged; A main control circuit, which is electrically connected to the plurality of output interfaces respectively; A power transmission circuit, wherein the input terminal of the power transmission circuit is connected to the input interface, the output terminal of the power transmission circuit is connected to a plurality of the output interfaces respectively, and the power transmission circuit is also connected to the main control circuit, and the power transmission circuit is used to transmit the power input by the input interface to the output interface; A switch switching circuit has a first connection terminal and multiple second connection terminals. The first connection terminal is connected to the first communication terminal of the input interface, and the multiple second connection terminals are connected to the multiple output interfaces one by one. The controlled terminal of the switch switching circuit is connected to the main control circuit. The main control circuit is used to control the switch switching circuit to open the path between the output interface of the single device to be fast charged and the first communication terminal of the input interface when it detects that a single device to be fast charged is connected to the output interface and outputs a fast charging demand signal, so as to establish a communication path between the device to be fast charged and the first communication terminal of the adapter, so that the adapter charges the device to be fast charged through the path between the power input terminal of the input interface and the output interface.

2. The charging circuit as described in claim 1, characterized in that, The power transmission circuit includes: A step-down circuit, wherein the input terminal of the step-down circuit is connected to the input interface, and the step-down circuit is used to step down the voltage input to the input interface and then output it. Multiple first switching circuits are provided, the input terminals of which are all connected to the output terminal of the step-down circuit, the output terminals of which are connected to the output interfaces one by one, and the controlled terminals of which are connected to the main control circuit. The charging circuit also includes: Multiple second switching circuits are provided, with the input terminals of the second switching circuits connected to the power input terminals of the input interfaces, the output terminals of the multiple second switching circuits being connected one-to-one with the multiple output interfaces, and the controlled terminals of the second switching circuits being connected to the main control circuit. The main control circuit is used to control the second switch circuit connected to the output interface of the single device to be fast charged to be turned on when it detects that a single device to be fast charged has been connected to the output interface and outputs a fast charging demand signal, and to control the first switch circuit connected to the output interface of the single device to be fast charged to be turned off.

3. The charging circuit as described in claim 2, characterized in that, The input interface also has a second communication terminal for connecting to the adapter, and the main control circuit is also connected to the second communication terminal of the input interface to establish a communication path with the adapter; The main control circuit is used to control the second switch circuit connected to the output interface of the device to be fast-charged to turn on and control the first switch circuit connected to it to turn off when it detects that the adapter and the fast-charging demand signal output by the device to be fast-charged are successfully matched.

4. The charging circuit as described in claim 2, characterized in that, The second switching circuit includes a first switching transistor and a first resistor. The input terminal of the first switching transistor is connected to the input interface, the output terminal of the first switching transistor is connected to the output interface, the controlled terminal of the first switching transistor is connected to the first terminal of the first resistor, and the second terminal of the first resistor is connected to the main control circuit. The first switching circuit includes: The circuit comprises a second switch, a third switch, a second resistor, and a third resistor. The input terminal of the second switch is connected to the output terminal of the step-down circuit. The output terminal of the second switch is connected to the output terminal of the third switch and the first terminal of the second resistor. The input terminal of the third switch is connected to the output interface. The controlled terminals of the second and third switches and the second terminal of the second resistor are all connected to the first terminal of the third resistor. The second terminal of the third resistor is connected to the main control circuit.

5. The charging circuit as described in any one of claims 2 to 4, characterized in that, The device to be charged has a communication pin, and the main control circuit is used to establish a communication connection with the device to be charged when the communication pin of the device to be charged is connected to the output interface. The main control circuit is used to control the switch switching circuit to open the communication path between the output interface of the single device to be fast charged and the first communication terminal of the input interface when it detects that the communication pin of a single device to be fast charged is connected to the output interface and outputs a fast charging demand signal. The main control circuit is also used to control the switch switching circuit to disconnect the communication path between the first communication terminal of the multiple output interfaces and the input interface when it is detected that the communication pins of at least two devices to be charged are connected to the corresponding output interfaces.

6. The charging circuit according to any one of claims 2 to 4, characterized in that, The device to be charged has a communication pin, and the main control circuit is used to establish a communication connection with the device to be charged when the communication pin of the device to be charged is connected to the output interface; the input interface also has a second communication terminal for connecting to the adapter, and the main control circuit is also connected to the second communication terminal of the input interface to establish a communication path with the adapter; The main control circuit is used to adjust the voltage output by the step-down circuit when it receives the power request signal output by the communication pin of the device to be charged and the total power signal output by the adapter.

7. The charging circuit according to any one of claims 2 to 4, characterized in that, The device to be charged has a communication pin, and the main control circuit is used to establish a communication connection with the device to be charged when the communication pin of the device to be charged is connected to the output interface. The main control circuit is used to control the first switch circuit connected to the output interface of the device with the largest requested voltage to be turned on and the second switch circuit connected to it to be turned off when multiple devices to be charged are detected to have their communication pins connected to the corresponding output interface and output different requested voltage requirements. And control the second switch circuit connected to the output interface of the other devices to be charged to be turned on, and control the first switch circuit connected to it to be turned off.

8. The charging circuit according to any one of claims 2 to 4, characterized in that, The device to be charged has a communication pin, and the main control circuit is used to establish a communication connection with the device to be charged when the communication pin of the device to be charged is connected to the output interface. The main control circuit is used to control the first switch circuit connected to the output interface of the multiple devices to be charged to be turned on and the second switch circuit connected to the output interface to be turned off when multiple communication pins of multiple devices to be charged are detected to be connected to the corresponding output interface and output multiple identical request voltage requirements.

9. The charging circuit as described in claim 1, characterized in that, The input interface also has a second communication terminal. The power input terminal, the first communication terminal, and the second communication terminal of the input interface are all used to connect to a host computer. The main control circuit is also connected to the second communication terminal of the input interface. The main control circuit is used to control the switch switching circuit to open the path between the output interface connected to the device to be charged and the first communication terminal of the input interface when it detects that the input interface is connected to the host computer and the device to be charged is connected to the output interface, so as to establish a communication path between the device to be charged and the host computer.

10. A charging device, characterized in that, Includes the charging circuit as described in any one of claims 1 to 9.

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