USB fast charging circuit and USB fast charging device

Abstract

The present application discloses a USB fast charging circuit and a USB fast charging device, wherein the USB fast charging circuit includes at least one first signal communication circuit, the first signal communication circuit includes at least two power supply interfaces, a first voltage conversion circuit, a first fast charging circuit and a first charging interface, the first voltage conversion circuit is connected to the two power supply interfaces respectively, the first fast charging circuit is connected to the first voltage conversion circuit; the first charging interface is connected to the first fast charging circuit, so as to solve the technical problem of low vehicle-mounted charging efficiency in the prior art.

Description

Technical Field

[0001] The invention relates to a USB fast charging circuit and a USB fast charging device, belonging to the technical field of charging. Background Art

[0002] Currently, many cars are equipped with USB ports. Although some new cars are equipped with fast charging functions, the output voltage and current of the USB ports of more old cars are generally below 5V / 1A, which cannot meet the fast charging function of mobile phones. As a result, the mobile phone charges very slowly through the above charging ports and the charging efficiency is low. Summary of the invention

[0003] In view of the above-mentioned deficiencies in the prior art, an object of the present invention is to provide a USB fast charging circuit and a USB fast charging device to solve the technical problem of low vehicle-mounted charging efficiency in the prior art.

[0004] In order to achieve the above object, the present invention provides a USB fast charging circuit, the USB fast charging circuit comprising:

[0005] At least one first signal communication circuit:

[0006] The first signal communication circuit comprises:

[0007] At least two power extraction interfaces, used to obtain a plurality of electrical signals corresponding to the number of the power extraction interfaces;

[0008] A first voltage-to-current conversion circuit is connected to the two power-taking interfaces respectively, and accumulates a plurality of the electrical signals into a charging initialization signal;

[0009] A first fast charging circuit connected to the first voltage-converting circuit;

[0010] At least one first charging interface connected to the first fast charging circuit;

[0011] The first fast charging circuit is used to obtain a first charging protocol signal when the first charging interface is connected to a charging device, start fast charging after mutual recognition of the protocol with the charging device through the first charging protocol signal, and output a feedback signal to the first voltage conversion circuit based on the charging initial signal and the first charging protocol signal to feedback and adjust the charging initial signal, so as to adjust the first fast charging signal output by the first fast charging circuit.

[0012] Optionally, the first signal communication circuit further includes:

[0013] The first fast charging circuit is further configured to output a second control signal when the second charging interface is connected to a device to be charged;

[0014] a first switch circuit, the first switch circuit being connected to the first fast charging circuit and configured to be turned on or off according to the second control signal;

[0015] At least one second charging interface is connected to the first switch circuit and outputs a second fast charging signal when the first switch circuit is turned on.

[0016] Optionally, the first signal communication circuit further includes a precision control circuit; the precision control circuit is respectively connected to the first voltage-current conversion circuit and the first fast charging circuit;

[0017] The precision control circuit is used to adjust the precision of the charging initialization signal output by the first voltage-to-current conversion circuit.

[0018] Optionally, the USB fast charging circuit further includes at least one second signal communication circuit:

[0019] The second signal communication circuit comprises:

[0020] a second voltage conversion circuit, connected to the power taking interfaces of the first signal communication circuit respectively, and accumulating a plurality of the electrical signals into a second charging initialization signal;

[0021] A second fast charging circuit connected to the second voltage conversion circuit;

[0022] A third charging interface connected to the second fast charging circuit;

[0023] The second fast charging circuit is used to obtain a second charging protocol signal when the third charging interface is connected to a charging device, and output a second feedback signal to the second transformer circuit based on the second charging initial signal and the second charging protocol signal to feedback and adjust the second charging initial signal, so as to adjust the second fast charging signal output by the second fast charging circuit.

[0024] Optionally, the first signal communication circuit also includes a first filtering circuit; the first input end of the first filtering circuit is connected to some of the power supply interfaces, the second input end of the first filtering circuit is respectively connected to the remaining power supply interfaces, and the output end of the first filtering circuit is connected to the input end of the first transformer and current converter circuit.

[0025] Optionally, the first signal communication circuit or the second signal communication circuit also includes a second filtering circuit; the input end of the second filtering circuit is connected to the output end of the first voltage-converting circuit or the output end of the second voltage-converting circuit, and the output end of the second filtering circuit is connected to the input end of the first fast charging circuit or the input end of the second fast charging circuit.

[0026] Optionally, the precision control circuit includes a first resistor, a second resistor, a first capacitor, a second capacitor and a third capacitor, the first transformer and current converter includes a feedback input terminal and an output terminal, the first end of the first resistor and the first end of the second resistor are both connected to the feedback input terminal of the first transformer and current converter, the second end of the first resistor, the first end of the first capacitor, the first end of the second capacitor and the first end of the third capacitor are all grounded; the second end of the second resistor, the second end of the first capacitor, the second end of the second capacitor and the second end of the third capacitor are all connected to the output terminal of the first transformer and current converter.

[0027] Optionally, the first charging interface is a TYPE-C interface and / or a TYPE-A interface, and the second charging interface is a TYPE-A interface and / or a TYPE-C interface.

[0028] Optionally, the first filter circuit includes a fuse, a fourth capacitor and a fifth capacitor, the first end of the fuse is the first input end of the first filter circuit, the first end of the fourth capacitor is connected to the first end of the fifth capacitor, and the connection node is the second input end of the first filter circuit, and the second end of the fuse is respectively connected to the second end of the fourth capacitor and the second end of the fifth capacitor, and the connection node is the output end of the first filter circuit.

[0029] In order to achieve the above-mentioned object, the present invention also proposes a USB fast charging device, which includes the USB fast charging circuit as described above.

[0030] The present invention obtains multiple electrical signals corresponding to the number of power supply interfaces through at least two power supply interfaces; the first voltage conversion circuit accumulates the multiple electrical signals into a charging initial signal, and the first fast charging circuit obtains the first charging protocol signal when the first charging interface is connected to the device to be charged, and outputs a feedback signal to the first voltage conversion circuit according to the charging initial signal and the first charging protocol signal to feedback and adjust the charging initial signal, so as to adjust the first fast charging signal output by the first fast charging circuit. When there are two charging interfaces in the vehicle through the above scheme, the voltage can be increased and the ordinary charging electrical signal can be converted into a fast charging signal through the above scheme. Thereby solving the technical problem of low on-board charging efficiency in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 Schematic diagram of a USB fast charging circuit module in one embodiment.

[0032] Figure 2 FIG. 4 is a circuit diagram of a USB fast charging circuit in one embodiment.

[0033] Figure 3 FIG. 4 is a partial circuit diagram of a USB fast charging circuit in one embodiment. DETAILED DESCRIPTION

[0034] In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of this application.

[0035] It should be noted that when an element is referred to as being "fixed on" or "set on" another component, it can be directly on the other component or indirectly set on the other component; when a component is referred to as being "connected to" another component, it can be directly connected to the other component or indirectly connected to the other component.

[0036] It should be understood that the terms "length", "width", "upper", "lower", "front", "back", "left" and "

[0037] The directions or positional relationships indicated by words such as "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present application and simplifying the description. They do not indicate or imply that the device or component referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the present application.

[0038] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "multiple" and "several" mean two or more, unless otherwise clearly and specifically defined.

[0039] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the conditions under which this application can be implemented. Therefore, they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in this application without affecting the effects and purposes that can be achieved by this application.

[0040] In order to solve the technical problem of inaccurate self-excitation determination in the prior art, the present invention proposes a USB fast charging circuit and a USB fast charging device.

[0041] In one embodiment, if Figure 1 As shown, the USB fast charging circuit includes: at least one first signal communication circuit. The first signal communication circuit includes at least two power supply interfaces 10, a first voltage conversion circuit 20, a first fast charging circuit 30 and at least one first charging interface J1. The first voltage conversion circuit 20 is connected to the two power supply interfaces 10 respectively, the first fast charging circuit 30 is connected to the first voltage conversion circuit 20, and the first charging interface J1 is connected to the first fast charging circuit 30.

[0042] Among them, at least two power supply interfaces 10 obtain multiple electrical signals corresponding to the number of the power supply interfaces 10; the first voltage conversion circuit 20 accumulates the multiple electrical signals into a charging initial signal; when the first charging interface J1 is connected to the device to be charged, the first fast charging circuit 30 obtains the first charging protocol signal, and starts fast charging after mutual recognition of the protocol with the device to be charged through the first charging protocol signal, and outputs a feedback signal to the first voltage conversion circuit 20 according to the charging initial signal and the first charging protocol signal to feedback and adjust the charging initial signal, thereby adjusting the first fast charging signal output by the first fast charging circuit 30. When there are two charging interfaces in the vehicle through the above scheme, the voltage can be increased and the ordinary charging electrical signal can be converted into a fast charging signal through the above scheme. Thereby solving the technical problem of low on-board charging efficiency in the prior art.

[0043] In addition, it should be noted that the charging initial signal output by the first voltage conversion circuit 20 at this time also provides the working voltage for the first fast charging circuit 30, so that when the power supply is not connected, there is no power consumption device in the entire circuit, and zero power consumption standby is achieved. Moreover, the charging initial signal is used for power supply, and due to the existence of the feedback of the first voltage conversion circuit 20 and the first fast charging circuit 30, the voltage stability of the first fast charging circuit 30 can be well guaranteed.

[0044] Optionally, the first signal communication circuit further includes a first switch circuit Q2 and at least one second charging interface J3: the first switch circuit Q2 is connected to the first fast charging circuit 30, and the second charging interface J3 is connected to the first switch circuit Q2.

[0045] Among them, the first fast charging outputs a second control signal when the second charging interface J3 is connected to a device to be charged; the first switch circuit Q2 is turned on or off according to the second control signal; the second charging interface J3 outputs a second fast charging signal when the first switch circuit Q2 is turned on. In the above steps, the first charging interface J1 and the second charging interface J3 can be fast charged at the same time, avoiding the situation where the charging ports are insufficient due to the accumulation of multiple charging ports.

[0046] Optionally, the first charging interface J1 is a TYPE-C interface and / or a TYPE-A interface, and the second charging interface J3 is a TYPE-A interface and / or a TYPE-C interface.

[0047] Optionally, the first fast charging circuit 30 and the second fast charging circuit can be implemented using a fast charging chip U2 such as CX2919AC. The specific circuit connection relationship is shown in FIG. Figure 2 shown.

[0048] Optionally, the first switch circuit Q2 can be implemented using a switch chip Q2, such as a chip such as CX3419.

[0049] Optionally, the first voltage conversion circuit 20 and the first voltage conversion circuit 20 can be implemented by using a voltage conversion chip such as CX8525. The specific circuit connection relationship is referenced to Figure 2 shown.

[0050] Optionally, the first signal communication circuit further includes a precision control circuit 50; the precision control circuit 50 is connected to the first voltage-current conversion circuit 20 and the first fast charging circuit 30 respectively;

[0051] The precision control circuit 50 adjusts the precision of the charging initial signal output by the first voltage-converting circuit 20. For example, through the above circuit, the voltage precision can be controlled within 0.25V. That is, the output deviation is within 0.25V. This avoids the voltage change caused by the load conversion at the output end, ensures the output voltage stability, and further reduces the deviation.

[0052] Optionally, the USB fast charging circuit further includes at least one second signal communication circuit: the second signal communication circuit includes a second voltage conversion circuit, a second fast charging circuit and a third charging interface. The second voltage conversion circuit is respectively connected to the power supply interface 10 of the first signal communication circuit, the second fast charging circuit is connected to the second voltage conversion circuit; the third charging interface is connected to the second fast charging circuit.

[0053] Among them, the second transformer circuit accumulates multiple electrical signals into a second charging initial signal; when the third charging interface is connected to a charging device, the second fast charging circuit obtains a second charging protocol signal, and outputs a second feedback signal to the second transformer circuit according to the second charging initial signal and the second charging protocol signal to feedback and adjust the second charging initial signal, so as to adjust the second fast charging signal output by the second fast charging circuit. At this time, through the above scheme, the number of fast charging output ports is further increased, and the needs of users are further guaranteed. In addition, the previously connected power supply interface 10 is still used at this time, which further improves the utilization rate of the accumulated electrical signals after the power supply interface 10 is connected in parallel. There is no need to set up a power supply or connect a power supply port separately.

[0054] Optionally, refer to Figure 2 As shown, the first signal communication circuit also includes a first filter circuit 40; the first input end of the first filter circuit 40 is connected to part of the power supply interface 10, the second input end of the first filter circuit 40 is respectively connected to the remaining power supply interfaces 10, and the output end of the first filter circuit 40 is connected to the input end of the first voltage transformer circuit 20.

[0055] In fact, by setting the first filter circuit 40 between the power supply interface 10 and all the first voltage conversion circuits 20 and the second voltage conversion circuit, it can be ensured that the electrical signal input to each voltage conversion circuit is free from the influence of noise, and the setting of the circuit connection relationship avoids the repeated setting of the first filter circuit 40 or the second filter circuit in each signal communication circuit. While further simplifying the circuit, the circuit expansion is also achieved.

[0056] Optionally, the first signal communication circuit or the second signal communication circuit also includes a second filter circuit 50 / 70; the input end of the second filter circuit 50 / 70 is connected to the output end of the first voltage transformer circuit 20 or the output end of the second voltage transformer circuit, and the output end of the second filter circuit 50 / 70 is connected to the input end of the first fast charging circuit 30 or the input end of the second fast charging circuit.

[0057] The second filter circuit 50 / 70 is used to filter out the output noise of the first voltage-converting circuit 20 or the second voltage-converting circuit, so as to ensure the stability of the output voltage.

[0058] Optionally, the second filter circuit 50 / 70 refers to Figure 2 The connection relationship among the first inductor L1, the sixth inductor C6 and the third resistor R3 shown in FIG.

[0059] Optionally, the precision control circuit 50 includes a first resistor R1, a second resistor R2, a first capacitor C1, a second capacitor C2 and a third capacitor C3, the first transformer and current converter 20 includes a feedback input terminal and an output terminal, the first end of the first resistor R1 and the first end of the second resistor R2 are both connected to the feedback input terminal of the first transformer and current converter 20, the second end of the first resistor R1, the first end of the first capacitor C1, the first end of the second capacitor C2 and the first end of the third capacitor C3 are all grounded; the second end of the second resistor R2, the second end of the first capacitor C1, the second end of the second capacitor C2 and the second end of the third capacitor C3 are all connected to the output terminal of the first transformer and current converter 20.

[0060] The first resistor R1 and the second resistor R2 are used as voltage divider resistors, and the precision is controlled by selecting different resistance values. The first capacitor C1, the second capacitor C2 and the third capacitor C3 can protect the voltage conversion circuit and the fast charging circuit.

[0061] Optionally, the first filter circuit 40 includes a fuse Z1, a fourth capacitor C4 and a fifth capacitor C5, the first end of the fuse Z1 is the first input end of the first filter circuit 40, the first end of the fourth capacitor C4 is connected to the first end of the fifth capacitor C5, and the connection node is the second input end of the first filter circuit 40, and the second end of the fuse Z1 is respectively connected to the second end of the fourth capacitor C4 and the second end of the fifth capacitor C5, and the connection node is the output end of the first filter circuit 40.

[0062] The following combination Figure 1 as well as Figure 2 Explain how this application works:

[0063] When the first charging interface J1 is connected to a device to be charged, and the second charging interface J3 is not connected to a device to be charged, the first charging protocol signal and the detection signal of the second charging interface J3 are obtained, and fast charging is started after mutual recognition of the protocol through the first charging protocol signal. At this time, according to the feedback signal output by the first charging protocol signal, the voltage and current of the charging initial signal of the first voltage conversion circuit 20 are adjusted to the range supported by the first charging protocol signal, and the first fast charging signal processed by the fast charging chip is output through the first charging interface J1; at the same time, the first fast charging circuit 30 controls the switch chip to be disconnected, and at this time, the second charging interface J3 has no output;

[0064] When the first charging interface J1 is not connected to a device to be charged, and the second charging interface J3 is connected to a device to be charged, the first charging protocol signal and the detection signal of the second charging interface J3 are obtained, and a feedback signal is output according to the detection signal to adjust the voltage and current of the charging initial signal of the first voltage conversion circuit 20 to the range supported by the second charging interface J3, and at the same time, the first fast charging circuit 30 controls the switch chip to be turned on to output the charging initial signal through the second charging interface J3; at the same time, the first charging interface J1 has no output;

[0065] The device to be charged is connected to the first charging interface J1, and the device to be charged is connected to the second charging interface J3, and the first charging protocol signal and the detection signal of the second charging interface J3 are obtained. After the protocol is mutually recognized through the first charging protocol signal, fast charging starts. At this time, the voltage and current of the charging initial signal of the first voltage-converter circuit 20 are adjusted to the range supported by the first charging protocol signal according to the feedback signal outputted by the first charging protocol signal, and the first fast charging signal processed by the fast charging chip is outputted through the second charging interface J3; at the same time, the first fast charging circuit 30 controls the switch chip to be turned on, and the second charging interface J3 outputs the charging initial signal at the same time.

[0066] When there are two charging ports in the vehicle, the voltage can be increased and the ordinary charging signal can be converted into a fast charging signal through the above solution, thereby solving the technical problem of low vehicle charging efficiency in the prior art.

[0067] In order to solve the above problems, the present invention further proposes a USB fast charging device, which includes the USB fast charging circuit as described above.

[0068] It should be noted that, since the USB fast charging device of the present application includes all the steps of the above-mentioned USB fast charging circuit, the USB fast charging device can also implement all the solutions of the USB fast charging circuit and have the same beneficial effects, which will not be repeated here.

[0069] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A USB fast charging circuit, characterized in that: The USB fast charging circuit comprises: At least one first signal communication circuit: The first signal communication circuit comprises: At least two power extraction interfaces, used to obtain a plurality of electrical signals corresponding to the number of the power extraction interfaces; A first voltage-to-current conversion circuit is connected to the two power-taking interfaces respectively, and accumulates a plurality of the electrical signals into a charging initialization signal; A first fast charging circuit connected to the first voltage-converting circuit; At least one first charging interface connected to the first fast charging circuit; The first fast charging circuit is used to obtain a first charging protocol signal when the first charging interface is connected to a device to be charged, and start fast charging after mutual recognition of the protocol with the device to be charged through the first charging protocol signal, and output a feedback signal to the first voltage conversion circuit according to the charging initial signal and the first charging protocol signal to feedback and adjust the charging initial signal, thereby adjusting the first fast charging signal output by the first fast charging circuit. The first fast charging circuit is also used to output a second control signal when the second charging interface is connected to a device to be charged; a first switch circuit, the first switch circuit being connected to the first fast charging circuit and configured to be turned on or off according to the second control signal; at least one second charging interface, connected to the first switch circuit, and outputting a second fast charging signal when the first switch circuit is turned on; A precision control circuit, the precision control circuit being connected to the first voltage-converter circuit and the first fast charging circuit respectively, and the precision control circuit being used to adjust the precision of the charging initialization signal output by the first voltage-converter circuit; The USB fast charging circuit further includes at least one second signal communication circuit, wherein the second signal communication circuit includes: a second voltage conversion circuit, connected to the power taking interfaces of the first signal communication circuit respectively, and accumulating a plurality of the electrical signals into a second charging initialization signal; A second fast charging circuit connected to the second voltage conversion circuit; A third charging interface connected to the second fast charging circuit; The second fast charging circuit is used to obtain a second charging protocol signal when the third charging interface is connected to a charging device, and output a second feedback signal to the second voltage conversion circuit according to the second charging initial signal and the second charging protocol signal to feedback and adjust the second charging initial signal, so as to adjust the second fast charging signal output by the second fast charging circuit; The precision control circuit includes a first resistor, a second resistor, a first capacitor, a second capacitor and a third capacitor. The first voltage transformer and current converter includes a feedback input terminal and an output terminal. The first end of the first resistor and the first end of the second resistor are both connected to the feedback input terminal of the first voltage transformer and current converter. The second end of the first resistor, the first end of the first capacitor, the first end of the second capacitor and the first end of the third capacitor are all grounded; the second end of the second resistor, the second end of the first capacitor, the second end of the second capacitor and the second end of the third capacitor are all connected to the output terminal of the first voltage transformer and current converter.

2. The USB fast charging circuit according to claim 1, characterized in that: The first signal communication circuit also includes a first filtering circuit; the first input end of the first filtering circuit is connected to part of the power supply interface, the second input end of the first filtering circuit is respectively connected to the remaining power supply interfaces, and the output end of the first filtering circuit is connected to the input end of the first transformer and current converter circuit.

3. The USB fast charging circuit according to claim 1, characterized in that: The first signal communication circuit or the second signal communication circuit also includes a second filtering circuit; the input end of the second filtering circuit is connected to the output end of the first voltage-converting circuit or the output end of the second voltage-converting circuit, and the output end of the second filtering circuit is connected to the input end of the first fast charging circuit or the input end of the second fast charging circuit.

4. The USB fast charging circuit according to claim 1, wherein: The first charging interface includes a TYPE-C interface and / or a TYPE-A interface, and the second charging interface includes a TYPE-A interface and / or a TYPE-C interface.

5. The USB fast charging circuit as claimed in claim 2, characterized in that: The first filter circuit includes a fuse, a fourth capacitor and a fifth capacitor. The first end of the fuse is the first input end of the first filter circuit. The first end of the fourth capacitor is connected to the first end of the fifth capacitor, and the connection node is the second input end of the first filter circuit. The second end of the fuse is respectively connected to the second end of the fourth capacitor and the second end of the fifth capacitor, and the connection node is the output end of the first filter circuit.

6. A USB fast charging device, characterized in that: The USB fast charging device includes the USB fast charging circuit as described in any one of claims 1-5.

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