Power switching circuit based on dual-port output

Abstract

The utility model relates to the technical field of power switching circuits, in particular to a power switching circuit based on double-port output, which comprises a main controller, and a first quick charging module and a second quick charging module with different powers, the main controller is connected with the first fast charging module or the second fast charging module through the first output circuit and the first switching circuit; the main controller is also connected with the first fast charging module or the second fast charging module through the second output circuit and the second switching circuit; the main controller judges the power of the first fast charging module and the power of the second fast charging module according to the first switching circuit and the second switching circuit, the first fast charging module is switched on through the first output circuit or the second output circuit, and the second fast charging module is switched on through the second output circuit or the first output circuit. The multi-port fast charging circuit solves the problems that in an existing multi-port fast charging circuit, voltage is output through A-D and then a voltage reduction circuit is used for achieving the multi-port fast charging effect, so that the number of model selection elements of the circuit is large, and cost is difficult to control.

Description

Technical Field

[0001] The utility model relates to the technical field of power switching circuits, in particular to a power switching circuit based on dual-port output. Background Art

[0002] Multi-port fast chargers are gaining popularity due to their convenience. Common charging methods for multi-port fast chargers include simultaneously plugging multiple ports together to reduce the voltage by 5V, and using independent DC-DC converters (DC-DC converters) to enable simultaneous fast charging of multiple ports.

[0003] Correspondingly, multi-port fast charging circuits can also be set up in many devices. However, the current multi-port fast charging circuits usually use AD to output 21V voltage first, and then use a buck circuit to achieve the multi-port fast charging effect, resulting in a large number of circuit components and difficult to control costs.

[0004] The utility model proposes a power switching circuit based on dual-port output. Utility Model Content

[0005] The utility model provides a power switching circuit based on dual-port output, which mainly solves the problem that the existing multi-port fast charging circuit usually adopts the method of first outputting 21V voltage through AD and then using a step-down (BUCK) circuit to achieve the effect of multi-port fast charging, resulting in a large number of circuit selection components and difficult cost control.

[0006] The utility model proposes a power switching circuit based on dual-port output, comprising a main controller, and a first fast-charging module and a second fast-charging module with different power; the main controller is connected to the first fast-charging module or the second fast-charging module via a first output circuit and a first switching circuit; the main controller is also connected to the first fast-charging module or the second fast-charging module via a second output circuit and a second switching circuit;

[0007] The main controller judges the power levels of the first fast charging module and the second fast charging module based on the first switching circuit and the second switching circuit, and turns on the first fast charging module through the first output circuit or the second output circuit, and turns on the second fast charging module through the second output circuit or the first output circuit.

[0008] Preferably, the first output circuit is an AD direct output circuit;

[0009] The second output circuit is a buck-boost circuit;

[0010] Under the judgment of the first switching circuit and the second switching circuit, the main controller is connected to the high-power fast charging module through the first output circuit and is connected to the low-power fast charging module through the second output circuit.

[0011] Preferably, the first switching circuit includes a MOS transistor Q2 and a MOS transistor Q4; the D end of the MOS transistor Q2 and the D end of the MOS transistor Q4 are connected in parallel to the output end of the first output circuit; the S end of the MOS transistor Q2 is connected to the first fast charging module; the S end of the MOS transistor Q4 is connected to the second fast charging module; the G end of the MOS transistor Q2 and the G end of the MOS transistor Q4 are respectively connected to the output port of the main controller.

[0012] Preferably, the second switching circuit includes a MOS tube Q5 and a MOS tube Q3; the D end of the MOS tube Q5 and the D end of the MOS tube Q3 are connected in parallel to the output end of the second output circuit; the S end of the MOS tube Q5 is connected to the first fast charging module; the S end of the MOS tube Q3 is connected to the second fast charging module; the G end of the MOS tube Q5 and the G end of the MOS tube Q3 are respectively connected to the output port of the main controller.

[0013] Preferably, when the power of the first fast charging module is greater than that of the second fast charging module, the MOS tube Q2 in the first switching circuit is turned on and Q4 is turned off, the MOS tube Q5 in the second switching circuit is turned off and the MOS tube Q3 is turned on, the main controller is connected to the first fast charging module through the first output circuit, and the main controller is connected to the second fast charging module through the second output circuit.

[0014] Preferably, when the power of the first fast charging module is less than that of the second fast charging module, the MOS tube Q4 in the first switching circuit is turned on and Q2 is turned off, the MOS tube Q5 in the second switching circuit is turned on and Q3 is turned off, the main controller is connected to the second fast charging module through the first output circuit, and the main controller is connected to the first fast charging module through the second output circuit.

[0015] Preferably, the main controller includes an MCU.

[0016] As can be seen from the above, the application of the technical solution provided by the utility model can achieve the following beneficial effects:

[0017] First, the power switching circuit proposed by the present invention is provided with only one step-down circuit and one AD circuit to realize dual-port output, which can reduce circuit cost and improve circuit stability;

[0018] Second, the power switching circuit proposed by the present invention is configured with MOS tubes of the first switching circuit and the second switching circuit, which are controlled by the main controller and realize that the high power is connected by the AD circuit and the low power is connected by the step-down circuit, thereby realizing automatic power switching of the dual-port output. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0020] Figure 1 This is a circuit diagram of the power switching circuit and its external main circuit diagram in an embodiment of the utility model. DETAILED DESCRIPTION

[0021] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without expending creative work are within the scope of protection of the present invention.

[0022] Existing multi-port fast charging circuits usually use an AD output of 21V voltage first, and then use a buck circuit to achieve the multi-port fast charging effect. This results in a large number of circuit components and difficult to control costs.

[0023] like Figure 1 As shown, in order to solve the above problems, this embodiment proposes a power switching circuit 100 based on dual-port output, which includes a main controller, a first fast charging module and a second fast charging module; wherein, the power of the first fast charging module and the second fast charging module are not the same; the main controller connects the first fast charging module or the second fast charging module through the first output circuit and the first switching circuit; the main controller also connects the first fast charging module or the second fast charging module through the second output circuit and the second switching circuit.

[0024] In this embodiment, the main controller judges the power levels of the first fast charging module and the second fast charging module based on the first switching circuit and the second switching circuit, and turns on the first fast charging module through the first output circuit or the second output circuit, and turns on the second fast charging module through the second output circuit or the first output circuit.

[0025] Preferably, in this embodiment, the first output circuit is an AD circuit; the second output circuit is a buck-boost circuit. In this embodiment, the first switching circuit and the second switching circuit determine whether the first or second fast-charging module is the higher-power module, and the first output circuit turns on the higher-power fast-charging module, while the second output circuit turns on the lower-power fast-charging module.

[0026] Preferably, the main controller includes an MCU.

[0027] In this embodiment, the dual-port fast charging output uses an AD output on one side and a buck-boost circuit on the other side. When the dual-plug output is used, the MCU is used to control which port has higher power and which output port uses the AD circuit first. This can eliminate one buck circuit, resulting in low cost and small product size.

[0028] More specifically, the first switching circuit includes a MOS transistor Q2 and a MOS transistor Q4; wherein, the D end of the MOS transistor Q2 and the D end of the MOS transistor Q4 are connected in parallel to the output end of the first output circuit; the S end of the MOS transistor Q2 is connected to the first fast charging module; the S end of the MOS transistor Q4 is connected to the second fast charging module; the G end of the MOS transistor Q2 and the G end of the MOS transistor Q4 are respectively connected to the output port of the main controller.

[0029] In addition, the second switching circuit includes a MOS transistor Q5 and a MOS transistor Q3; the D end of the MOS transistor Q5 and the D end of the MOS transistor Q3 are connected in parallel to the output end of the second output circuit; the S end of the MOS transistor Q3 is connected to the second fast charging module; the G end of the MOS transistor Q5 and the G end of the MOS transistor Q3 are respectively connected to the output port of the main controller.

[0030] In this embodiment, when the power of the first fast charging module is greater than that of the second fast charging module, the MOS tube Q2 in the first switching circuit is turned on and Q4 is turned off, the MOS tube Q5 in the second switching circuit is turned off, and the MOS tube Q3 is turned on, the main controller is connected to the first fast charging module through the first output circuit, and the main controller is connected to the second fast charging module through the second output circuit; when the power of the first fast charging module is less than that of the second fast charging module, the MOS tube Q4 in the first switching circuit is turned on and Q2 is turned off, the MOS tube Q5 in the second switching circuit is turned on and Q3 is turned off, the main controller is connected to the second fast charging module through the first output circuit, and the main controller is connected to the first fast charging module through the second output circuit.

[0031] Preferably, in this embodiment, the MOS transistors Q2 , Q3 , Q4 and Q5 are all N-channel MOS transistors.

[0032] Preferably, in this embodiment, the G terminals of the MOS tubes Q2 , Q3 , Q4 and Q5 are all connected to the vout pin on the MCU.

[0033] Preferably, in this embodiment, the MOS transistor Q5 and the MOS transistor Q2 are both connected to the same VBUS pin of the first fast charging module; the MOS transistor Q3 and the MOS transistor Q4 are both connected to the same VBUS pin of the second fast charging module.

[0034] Preferably, in this embodiment, the first fast charging module and the second fast charging module are also provided with their own conventional peripheral circuits to ensure the normal operation of the fast charging modules.

[0035] In this embodiment, by controlling the on / off of the first switch circuit and the second switch circuit, the main controller is connected to the fast charging module with higher power through the AD circuit, and is connected to the fast charging circuit with lower power through the buck-boost circuit. At the same time, only one AD circuit and one buck-boost circuit are used, which can reduce the number of conventional buck circuits and reduce costs.

[0036] The above-described embodiments do not constitute a limitation on the scope of protection of this technical solution. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the above-described embodiments shall be included in the scope of protection of this technical solution.

Claims

1. A power switching circuit based on dual-port output, characterized in that: The main controller includes a first fast-charging module and a second fast-charging module with different power; the main controller is connected to the first fast-charging module or the second fast-charging module via a first output circuit and a first switching circuit; the main controller is also connected to the first fast-charging module or the second fast-charging module via a second output circuit and a second switching circuit; The main controller judges the power levels of the first fast charging module and the second fast charging module based on the first switching circuit and the second switching circuit, and turns on the first fast charging module through the first output circuit or the second output circuit, and turns on the second fast charging module through the second output circuit or the first output circuit.

2. The power switching circuit based on dual-port output according to claim 1, characterized in that: The first output circuit is an AD direct output circuit; The second output circuit is a buck-boost circuit; Under the judgment of the first switching circuit and the second switching circuit, the main controller is connected to the high-power fast charging module through the first output circuit and is connected to the low-power fast charging module through the second output circuit.

3. The power switching circuit based on dual-port output according to claim 2, characterized in that: The first switching circuit includes a MOS transistor Q2 and a MOS transistor Q4; the D end of the MOS transistor Q2 and the D end of the MOS transistor Q4 are connected in parallel to the output end of the first output circuit; the S end of the MOS transistor Q2 is connected to the first fast charging module; the S end of the MOS transistor Q4 is connected to the second fast charging module; the G end of the MOS transistor Q2 and the G end of the MOS transistor Q4 are respectively connected to the output port of the main controller.

4. The power switching circuit based on dual-port output according to claim 3, characterized in that: The second switching circuit includes a MOS transistor Q5 and a MOS transistor Q3; the D end of the MOS transistor Q5 and the D end of the MOS transistor Q3 are connected in parallel to the output end of the second output circuit; the S end of the MOS transistor Q5 is connected to the first fast charging module; the S end of the MOS transistor Q3 is connected to the second fast charging module; the G end of the MOS transistor Q5 and the G end of the MOS transistor Q3 are respectively connected to the output port of the main controller.

5. The power switching circuit based on dual-port output according to claim 4, characterized in that: When the power of the first fast charging module is greater than that of the second fast charging module, the MOS tube Q2 in the first switching circuit is turned on and Q4 is turned off, the MOS tube Q5 in the second switching circuit is turned off and the MOS tube Q3 is turned on, the main controller is connected to the first fast charging module through the first output circuit, and the main controller is connected to the second fast charging module through the second output circuit.

6. The power switching circuit based on dual-port output according to claim 5, characterized in that: When the power of the first fast charging module is less than that of the second fast charging module, the MOS tube Q4 in the first switching circuit is turned on and Q2 is turned off, the MOS tube Q5 in the second switching circuit is turned on and Q3 is turned off, the main controller is connected to the second fast charging module through the first output circuit, and the main controller is connected to the first fast charging module through the second output circuit.

7. A power switching circuit based on dual-port output according to any one of claims 1 to 6, characterized in that: The main controller includes an MCU.

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