Switching circuit for multiple TYPE-C and DC power input

Abstract

A switching circuit for multi-channel TYPE-C and DC power inputs comprises a first switching module for connecting a DC power supply to a power bus, a second switching module for connecting a TYPE-C1 power supply to the power bus, and a third switching module for connecting a TYPE-C2 power supply to the power bus; when the DC power supply, the TYPE-C1 power supply, and the TYPE-C2 power supply are all connected to the power bus, the switching circuit controls the corresponding first switching module to be turned on, and the second switching module and the third switching module to be turned off according to a detected voltage signal and the priority between the three; when only the TYPE-C1 power supply and the TYPE-C2 power supply are connected to the power bus, the switching circuit controls the second switching module to be turned on, and the third switching module to be turned off according to the detected voltage signal and the priority between the two; when only the TYPE-C2 power supply is connected to the power bus, the switching circuit controls the third switching module to be turned on according to the detected voltage signal of the TYPE-C2 power supply. The above pure hardware switching circuit is simple in structure and saves EC and MCU resources.

Description

Technical Field

[0001] The utility model belongs to the technical field of power supply circuits, and in particular relates to a switching circuit for multi-channel TYPE-C and DC power supply inputs. Background Art

[0002] With the development of science and technology, for the unified purpose of IO interface, TYPE-C interface has gradually replaced other interfaces and is more used in devices such as laptops. Because it can be used as both signal output and power input, when designing multiple full-function TYPE-C interfaces, corresponding logic is required to control its priority to prevent power backflow and damage to the equipment.

[0003] The traditional TYPE-C / DC power switching circuit is usually composed of MOS tubes, diodes and other devices, and the on and off of the EC or MCU are controlled to achieve the switching of the power input. There are many devices on the circuit, and it needs to occupy EC / MCU resources and is implemented through program logic.

[0004] Based on the above reasons, there is an urgent need to provide a switching circuit for multi-channel TYPE-C and DC power inputs that can solve the above problems. Utility Model Content

[0005] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a switching circuit for multi-channel TYPE-C and DC power inputs that is pure hardware and has a simple structure, thereby saving EC and MCU resources.

[0006] The utility model is implemented as follows: a switching circuit for multi-channel TYPE-C, DC power input, comprising:

[0007] A plurality of switching modules are selected, including: a first switching module for connecting a DC power supply to a power bus, a second switching module for connecting a TYPE-C1 power supply to a power bus, and a third switching module for connecting a TYPE-C2 power supply to a power bus;

[0008] When the DC power supply, TYPE-C1 power supply and TYPE-C2 power supply are all connected to the power bus, the switching circuit is used to detect the voltage signals input by the TYPE-C1 power supply, the TYPE-C2 power supply and the DC power supply respectively, and control the corresponding first switching module to be turned on according to the detected voltage signal and the priority between the three, and control the second switching module and the third switching module to be turned off;

[0009] When only the TYPE-C1 power supply and the TYPE-C2 power supply are connected to the power bus, the switching circuit controls the second switching module to be turned on and the third switching module to be turned off according to the detected voltage signals of the TYPE-C1 power supply and the TYPE-C2 power supply and the priority between the two;

[0010] When only the TYPE-C2 power supply is connected to the power bus, the switching circuit controls the third switching module to be turned on according to the detected voltage signal of the TYPE-C2 power supply;

[0011] Among them, after the first sampling unit of the second switching module is connected to the TYPE-C1 power supply, it is used to enable the switching circuit to detect the voltage signal of the TYPE-C1 power supply; after the second sampling unit of the third switching module is connected to the TYPE-C2 power supply, it is used to enable the switching circuit to detect the voltage signal of the TYPE-C2 power supply.

[0012] Preferably, the first switching module includes:

[0013] A first current limiting unit, used for limiting the current of the +VADP voltage signal output by the DC power supply;

[0014] The first voltage dividing unit is used to divide the + voltage VADP signal after current limiting so that the voltage after voltage division can reach the threshold value of the enable control signal;

[0015] A first conduction unit, which enables the first switching module to be in a conduction state according to a received enable control signal, wherein the first conduction unit includes a first upper conduction unit and a first lower conduction unit. After the first upper conduction unit is turned on, it is used to pull down the voltage signal output by the TYPE-C1 power supply, thereby putting the second switching module in a closed state; after the first lower conduction unit is turned on, it is used to pull down the voltage signal output by the TYPE-C2 power supply, thereby putting the third switching module in a closed state.

[0016] Preferably, the first current limiting unit is a first diode, the first voltage dividing unit includes a first resistor and a second resistor, and the first conduction unit includes a first MOS transistor and a second MOS transistor;

[0017] The anode of the first diode is used to receive the +VADP voltage signal output by the DC power supply;

[0018] One end of the first resistor is connected to the cathode of the diode, and the other end of the first resistor is respectively connected to one end of the second resistor, the gate of the first MOS tube, the gate of the second MOS tube and the DP_EN_N pin of the DC power supply, so as to enable the DP_EN_N pin of the DC power supply to output a voltage signal, the other end of the second resistor is grounded, the drain of the first MOS tube is used to be connected to the +VBUS_TYPEC_IN pin of the TYPE-C1 power supply, the source of the first MOS tube is grounded, the drain of the second MOS tube is used to be connected to the +VBUS_TYPEC1_IN pin of the TYPE-C2 power supply, and the source of the second MOS tube is grounded;

[0019] When there is voltage on the gate of the first MOS tube, the drain and source of the first MOS tube are connected to ground, and the voltage output by the TYPE-C1 power supply is pulled down, so that the TYPE-C1 power supply has no output voltage;

[0020] When the gate of the second MOS tube is supplied with voltage, the drain and source of the second MOS tube are connected to ground, and the voltage output by the TYPE-C2 power supply is pulled down, so that the TYPE-C2 power supply has no output voltage.

[0021] Preferably, the first switching module further includes a first buffer unit for enabling the voltage signal output by the DC power supply to be transmitted smoothly.

[0022] Preferably, the first buffer unit is a first capacitor, one end of the first capacitor is connected to the other end of the first resistor, and the other end of the first capacitor is grounded.

[0023] Preferably, the second switching module includes:

[0024] A second current limiting unit, used for limiting the current of the voltage signal output by the TYPE-C1 power supply;

[0025] A second voltage dividing unit is used to divide the voltage signal after current limiting and form a path between the TYPE-C1_EN pin of the TYPE-C1, so that the TYPE-C1 power supply outputs a voltage signal;

[0026] The second conduction unit is used to lower the voltage output by the TYPE-C2 power supply without outputting a voltage signal.

[0027] Preferably, the first sampling unit includes a first sampling resistor, the second current limiting unit is a second diode, the second voltage dividing unit includes a third resistor and a fourth resistor, and the second conduction unit includes a third MOS tube;

[0028] One end of the first sampling resistor is used to receive the voltage signal output by the TYPE-C1 power supply, and the other end of the first sampling resistor is connected to the anode of the second diode;

[0029] One end of the third resistor is connected to the cathode of the second diode, the other end of the third resistor is respectively connected to one end of the fourth resistor, the gate of the third MOS tube, the TYPEC_1_EN_N pin of the TYPEC1 and the TYPEC_2_EN_N pin of the TYPEC2, one end of the fourth resistor is grounded, the drain of the third MOS tube is used to be connected to the +VBUS_TYPEC1_IN pin of the TYPE-C2 power supply, and the source of the third MOS tube is grounded;

[0030] When the gate of the second MOS tube is powered by voltage, the drain and source of the second MOS tube are connected to ground, and the voltage output by the TYPE-C2 power supply is pulled down, so that the TYPE-C2 power supply has no output voltage, and the TYPE-C1 power supply outputs a voltage signal.

[0031] Preferably, the third switching module includes:

[0032] A third current limiting unit, used for limiting the current of the voltage signal output by the TYPE-C2 power supply;

[0033] The third voltage dividing unit is used to divide the voltage signal after current limiting and form a path between the TYPE-C2_EN pin of the TYPE-C2, so that the TYPE-C2 power supply outputs a voltage signal.

[0034] Preferably, the second sampling unit includes a second sampling resistor, the third current limiting unit is a third diode, and the third voltage dividing unit includes a fifth resistor and a sixth resistor;

[0035] One end of the first sampling resistor is used to receive the voltage signal output by the TYPE-C2 power supply, and the other end of the first sampling resistor is connected to the anode of the third diode;

[0036] One end of the fifth resistor is connected to the cathode of the third diode, and the other end of the fifth resistor is respectively connected to one end of the sixth resistor and the TYPEC_2_EN_N pin of the TYPEC2 power supply, and one end of the sixth resistor is grounded, so as to enable the TYPE-C2 power supply to output a voltage signal.

[0037] Preferably, the third switching module further includes a second buffer unit for enabling the voltage signal output by the TYPEC2 power supply to be transmitted smoothly.

[0038] The utility model provides a switching circuit for multi-channel TYPE-C and DC power input, comprising a first switching module for connecting a DC power supply to a power bus, a second switching module for connecting a TYPE-C1 power supply to the power bus, and a third switching module for connecting a TYPE-C2 power supply to the power bus; when the DC power supply, the TYPE-C1 power supply, and the TYPE-C2 power supply are all connected to the power bus, the switching circuit controls the corresponding first switching module to be turned on, and the second switching module and the third switching module to be turned off according to a detected voltage signal and a priority between the three; when only the TYPE-C1 power supply and the TYPE-C2 power supply are connected to the power bus, the switching circuit controls the second switching module to be turned on, and the third switching module to be turned off according to a detected voltage signal and a priority between the two; when only the TYPE-C2 power supply is connected to the power bus, the switching circuit controls the third switching module to be turned on according to the detected voltage signal of the TYPE-C2 power supply. The above pure hardware switching circuit has a simple structure and saves EC and MCU resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solution of the present utility model, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0040] Figure 1 It is a block diagram of a switching circuit for multiple TYPE-C and DC power inputs provided by an embodiment of the utility model.

[0041] Figure 2 It is a schematic diagram of a switching circuit for multiple TYPE-C and DC power inputs provided in an embodiment of the utility model.

[0042] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0043] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0044] In the present invention, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inside", "outside", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or state relationships based on the positions or state relationships shown in the drawings. These terms are mainly used to better describe the present invention and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific position, or to be constructed and operated in a specific position.

[0045] In addition, some of the above terms may be used to express other meanings in addition to indicating a position or state relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those skilled in the art, the specific meanings of these terms in this utility model can be understood according to specific circumstances.

[0046] In addition, the terms "installed", "set", "provided with", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0047] In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components, which may be the same or different in specific types and configurations, and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, "plurality" means two or more.

[0048] like Figure 1 and Figure 2 As shown, the embodiment of the utility model provides a switching circuit for multiple TYPE-C and DC power inputs, including:

[0049] A plurality of switching modules are selected, including: a first switching module 100 for connecting a DC power supply to a power bus, a second switching module 200 for connecting a TYPE-C1 power supply to a power bus, and a third switching module 300 for connecting a TYPE-C2 power supply to a power bus;

[0050] When the DC power supply, TYPE-C1 power supply and TYPE-C2 power supply are all connected to the power bus, the switching circuit is used to respectively detect the voltage signals input by the TYPE-C1 power supply, the TYPE-C2 power supply and the DC power supply, and control the corresponding first switching module 100 to be turned on according to the detected voltage signal and the priority between the three, and control the second switching module 200 and the third switching module 300 to be turned off. In this embodiment, a first switch module that is turned on and off as the first switching module 100 is turned on or off is connected between the output end of the first switching module 100 and the power bus, a second switch module that is turned on and off as the second switching module 200 is turned on or off is connected between the output end of the second switching module 200 and the power bus, and a third switch module that is turned on and off as the third switching module 300 is turned on or off is connected between the output end of the third switching module 300 and the power bus;

[0051] When only the TYPE-C1 power supply and the TYPE-C2 power supply are connected to the power bus, the switching circuit controls the second switching module 200 to be turned on and the third switching module 300 to be turned off according to the detected voltage signals of the TYPE-C1 power supply and the TYPE-C2 power supply and the priority between the two;

[0052] When only the TYPE-C2 power supply is connected to the power bus, the switching circuit controls the third switching module 300 to be turned on according to the detected voltage signal of the TYPE-C2 power supply;

[0053] Among them, after the first sampling unit 201 of the second switching module 200 is connected to the TYPE-C1 power supply, it is used to enable the switching circuit to detect the voltage signal of the TYPE-C1 power supply. After the second sampling unit 301 of the third switching module 300 is connected to the TYPE-C2 power supply, it is used to enable the switching circuit to detect the voltage signal of the TYPE-C2 power supply.

[0054] In this embodiment, by connecting to the first sampling unit 201 of the second switching module 200 or connecting to the second sampling unit 301 of the third switching module 300 , it is determined whether the second switching module 200 or the third switching module 300 is turned on.

[0055] The embodiment of the utility model adopts the above pure hardware switching circuit, which has a simple structure and saves EC and MCU resources.

[0056] Preferably, the first switching module 100 includes:

[0057] A first current limiting unit 110, configured to limit the current of a +VADP voltage signal output by the DC power supply;

[0058] The first voltage dividing unit 120 is used to divide the + voltage VADP signal after current limiting so that the voltage after voltage division can reach the threshold value for leading out the enable control signal. In this embodiment, the enable control signal is output by the DP_EN_H pin of the DC power supply;

[0059] The first conduction unit puts the first switching module in a conduction state according to the received enable control signal. The first conduction unit includes a first upper conduction unit 130 and a first lower conduction unit 140. After the first upper conduction unit 130 is turned on, it is used to pull down the voltage signal output by the TYPE-C1 power supply, so that the second switching module 200 is in a closed state; after the first lower conduction unit 140 is turned on, it is used to pull down the voltage signal output by the TYPE-C2 power supply, so that the third switching module 300 is in a closed state.

[0060] Preferably, the first current limiting unit 110 is a first diode DP4, the first voltage dividing unit 120 includes a first resistor R136 and a second resistor R183, the first upper conducting unit 130 is a first MOS transistor QP3, and the first lower conducting unit 140 is a second MOS transistor QP4;

[0061] The anode of the first diode DP4 is used to receive the +VADP voltage signal output by the DC power supply;

[0062] One end of the first resistor R136 is connected to the cathode of the diode DP4, and the other end of the first resistor R136 is respectively connected to one end of the second resistor R183, the gate G of the first MOS transistor QP3, the gate G of the second MOS transistor QP4 and the DP_EN_N pin of the DC power supply. After voltage division between the first resistor R136 and the second resistor R183, the DP_EN_N pin of the DC power supply is used to output a voltage signal. The other end of the second resistor is grounded, the drain D of the first MOS transistor QP3 is used to connect to the +VBUS_TYPEC_IN pin of the TYPE-C1 power supply, the source S of the first MOS transistor QP3 is grounded, the drain D of the second MOS transistor QP4 is used to connect to the +VBUS_TYPEC1_IN pin of the TYPE-C2 power supply, and the source S of the second MOS transistor QP4 is grounded;

[0063] When the gate G of the first MOS transistor QP3 is supplied with voltage, the drain D and the source S of the first MOS transistor QP3 are connected to the ground, and the voltage output by the TYPE-C1 power supply is pulled down, so that the TYPE-C1 power supply has no output voltage;

[0064] When the gate G of the second MOS transistor QP4 is supplied with voltage, the drain D and the source S of the second MOS transistor QP4 are connected to ground and the voltage output by the TYPE-C2 power supply is pulled down, so that the TYPE-C2 power supply has no output voltage.

[0065] Preferably, the first switching module 100 further includes a first buffer unit for enabling the voltage signal output by the DC power supply to be transmitted smoothly.

[0066] Preferably, the first buffer unit is a first capacitor C150, one end of the first capacitor C150 is connected to the other end of the first resistor R136, and the other end of the first capacitor C150 is grounded.

[0067] Preferably, the second switching module 200 includes:

[0068] A second current limiting unit 210, used for limiting the current of the voltage signal output by the TYPE-C1 power supply;

[0069] The second voltage dividing unit 220 is used to divide the voltage signal after current limiting and form a path between the TYPE-C1_EN pin of the TYPE-C1, so that the TYPE-C1 power supply outputs a voltage signal;

[0070] The second conduction unit 230 is used to pull down the voltage output by the TYPE-C2 power supply so that the TYPE-C2 power supply has no output voltage signal.

[0071] Preferably, the first sampling unit includes a first sampling resistor R88, the second current limiting unit 210 is a second diode DP2, the second voltage dividing unit 220 includes a third resistor R127 and a fourth resistor R182, and the second conduction unit 230 includes a third MOS transistor QP2;

[0072] One end of the first sampling resistor R88 is used to receive the voltage signal output by the TYPE-C1 power supply, and the other end of the first sampling resistor R88 is connected to the anode of the second diode DP2;

[0073] One end of the third resistor R127 is connected to the cathode of the second diode DP2, and the other end of the third resistor R127 is respectively connected to one end of the fourth resistor R182, the gate G of the third MOS transistor QP2, the TYPEC_1_EN_N pin of the TYPEC1, and the TYPEC_2_EN_N pin of the TYPEC2, one end of the fourth resistor R182 is grounded, the drain of the third MOS transistor is used to be connected to the +VBUS_TYPEC1_IN pin of the TYPE-C2 power supply, and the source S of the third MOS transistor QP2 is grounded;

[0074] When the gate G of the second MOS transistor QP2 is supplied with voltage, the drain D and source S of the second MOS transistor QP2 are connected to ground, and the voltage output by the TYPE-C2 power supply is pulled down, so that the TYPE-C2 power supply has no output voltage, and the TYPE-C1 power supply outputs a voltage signal.

[0075] Preferably, the second switching module 200 further includes a buffer unit 240 for enabling the voltage signal output by the TYPEC1 power supply to be transmitted smoothly. The buffer unit 240 is a capacitor C150. One end of the capacitor C150 is connected to the other end of the third resistor R127, and the other end of the capacitor C150 is grounded.

[0076] Preferably, the third switching module 300 includes:

[0077] A third current limiting unit 310, used for limiting the current of the voltage signal output by the TYPE-C2 power supply;

[0078] The third voltage dividing unit 320 is used to divide the voltage signal after current limiting and form a path between the TYPE-C2_EN pin of the TYPE-C2, so that the TYPE-C2 power supply outputs a voltage signal.

[0079] Preferably, the second sampling unit 301 includes a second sampling resistor R49, the third current limiting unit 310 is a third diode DP1, and the third voltage dividing unit 320 includes a fifth resistor R110 and a sixth resistor R166;

[0080] One end of the first sampling resistor R49 is used to receive the voltage signal output by the TYPE-C2 power supply, and the other end of the first sampling resistor R49 is connected to the anode of the third diode DP1;

[0081] One end of the fifth resistor R110 is connected to the cathode of the third diode DP1, and the other end of the fifth resistor R110 is respectively connected to one end of the sixth resistor R166 and the TYPEC_2_EN_N pin of the TYPEC2 power supply, and one end of the sixth resistor R166 is grounded to enable the TYPE-C2 power supply to output a voltage signal.

[0082] Preferably, the third switching module 300 also includes a second buffer unit 330 for enabling the voltage signal output by the TYPEC2 power supply to be transmitted smoothly, the second buffer unit 330 is a second capacitor C144, one end of the second capacitor C144 is connected to the other end of the fifth resistor R110, and the other end of the second capacitor C144 is grounded.

[0083] The above is a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications are also considered to be within the protection scope of the present invention.

Claims

1. A switching circuit for multiple TYPE-C and DC power inputs, characterized in that: include: A plurality of switching modules are selected, including: a first switching module for connecting a DC power supply to a power bus, a second switching module for connecting a TYPE-C1 power supply to a power bus, and a third switching module for connecting a TYPE-C2 power supply to a power bus; When the DC power supply, TYPE-C1 power supply and TYPE-C2 power supply are all connected to the power bus, the switching circuit is used to detect the voltage signals input by the TYPE-C1 power supply, the TYPE-C2 power supply and the DC power supply respectively, and control the corresponding first switching module to be turned on according to the detected voltage signal and the priority between the three, and control the second switching module and the third switching module to be turned off; When only the TYPE-C1 power supply and the TYPE-C2 power supply are connected to the power bus, the switching circuit controls the second switching module to be turned on and the third switching module to be turned off according to the detected voltage signal of the TYPE-C1 power supply and the priority between the two; When only the TYPE-C2 power supply is connected to the power bus, the switching circuit controls the third switching module to be turned on according to the detected voltage signal of the TYPE-C2 power supply; Among them, after the first sampling unit of the second switching module is connected to the TYPE-C1 power supply, it is used to enable the switching circuit to detect the voltage signal of the TYPE-C1 power supply; after the second sampling unit of the third switching module is connected to the TYPE-C2 power supply, it is used to enable the switching circuit to detect the voltage signal of the TYPE-C2 power supply.

2. The switching circuit for multiple TYPE-C and DC power inputs according to claim 1, characterized in that: The first switching module includes: A first current limiting unit, used for limiting the current of the +VADP voltage signal output by the DC power supply; The first voltage dividing unit is used to divide the + voltage VADP signal after current limiting so that the voltage after voltage division can reach the threshold value of the enable control signal; A first conduction unit, which enables the first switching module to be in a conduction state according to a received enable control signal, wherein the first conduction unit includes a first upper conduction unit and a first lower conduction unit. After the first upper conduction unit is turned on, it is used to pull down the voltage signal output by the TYPE-C1 power supply, thereby putting the second switching module in a closed state; after the first lower conduction unit is turned on, it is used to pull down the voltage signal output by the TYPE-C2 power supply, thereby putting the third switching module in a closed state.

3. The switching circuit for multiple TYPE-C and DC power inputs according to claim 2, characterized in that: The first current limiting unit is a first diode, the first voltage dividing unit includes a first resistor and a second resistor, and the first conduction unit includes a first MOS transistor and a second MOS transistor; The anode of the first diode is used to receive the +VADP voltage signal output by the DC power supply; One end of the first resistor is connected to the cathode of the diode, and the other end of the first resistor is respectively connected to one end of the second resistor, the gate of the first MOS tube, the gate of the second MOS tube and the DP_EN_N pin of the DC power supply, so as to enable the DP_EN_N pin of the DC power supply to output a voltage signal, the other end of the second resistor is grounded, the drain of the first MOS tube is used to be connected to the +VBUS_TYPEC_IN pin of the TYPE-C1 power supply, the source of the first MOS tube is grounded, the drain of the second MOS tube is used to be connected to the +VBUS_TYPEC1_IN pin of the TYPE-C2 power supply, and the source of the second MOS tube is grounded; When the gate of the first MOS tube is powered by voltage, the drain and source of the first MOS tube are connected to ground, and the voltage output by the TYPE-C1 power supply is pulled down, so that the TYPE-C1 power supply has no output voltage; When the gate of the second MOS tube is supplied with voltage, the drain and source of the second MOS tube are connected to ground, and the voltage output by the TYPE-C2 power supply is pulled down, so that the TYPE-C2 power supply has no output voltage.

4. The switching circuit for multiple TYPE-C and DC power inputs according to claim 3, characterized in that: The first switching module also includes a first buffer unit for enabling the voltage signal output by the DC power supply to be transmitted smoothly.

5. The switching circuit for multiple TYPE-C and DC power inputs according to claim 4, characterized in that: The first buffer unit is a first capacitor, one end of the first capacitor is connected to the other end of the first resistor, and the other end of the first capacitor is grounded.

6. The switching circuit for multiple TYPE-C, DC power input according to claim 1, characterized in that: The second switching module includes: A second current limiting unit, used for limiting the current of the voltage signal output by the TYPE-C1 power supply; A second voltage dividing unit is used to divide the voltage signal after current limiting and form a path between the TYPE-C1_EN pin of the TYPE-C1, so that the TYPE-C1 power supply outputs a voltage signal; The second conduction unit is used to lower the voltage output by the TYPE-C2 power supply without outputting a voltage signal.

7. The switching circuit for multiple TYPE-C and DC power inputs according to claim 6, characterized in that: The first sampling unit includes a first sampling resistor, the second current limiting unit is a second diode, the second voltage dividing unit includes a third resistor and a fourth resistor, and the second conduction unit includes a third MOS tube; One end of the first sampling resistor is used to receive the voltage signal output by the TYPE-C1 power supply, and the other end of the first sampling resistor is connected to the anode of the second diode; One end of the third resistor is connected to the cathode of the second diode, the other end of the third resistor is respectively connected to one end of the fourth resistor, the gate of the third MOS tube, the TYPEC_1_EN_N pin of the TYPEC1 and the TYPEC_2_EN_N pin of the TYPEC2, one end of the fourth resistor is grounded, the drain of the third MOS tube is used to be connected to the +VBUS_TYPEC1_IN pin of the TYPE-C2 power supply, and the source of the third MOS tube is grounded; When the gate of the second MOS tube is powered by voltage, the drain and source of the second MOS tube are connected to ground, and the voltage output by the TYPE-C2 power supply is pulled down, so that the TYPE-C2 power supply has no output voltage, and the TYPE-C1 power supply outputs a voltage signal.

8. The switching circuit for multiple TYPE-C and DC power inputs according to claim 1, characterized in that: The third switching module includes: A third current limiting unit, used for limiting the current of the voltage signal output by the TYPE-C2 power supply; The third voltage dividing unit is used to divide the voltage signal after current limiting and form a path between the TYPE-C2_EN pin of the TYPE-C2, so that the TYPE-C2 power supply outputs a voltage signal.

9. The switching circuit for multiple TYPE-C and DC power inputs according to claim 8, characterized in that: The first sampling unit includes a first sampling resistor, the second sampling unit includes a second sampling resistor, the third current limiting unit is a third diode, and the third voltage dividing unit includes a fifth resistor and a sixth resistor; One end of the first sampling resistor is used to receive the voltage signal output by the TYPE-C2 power supply, and the other end of the first sampling resistor is connected to the anode of the third diode; One end of the fifth resistor is connected to the cathode of the third diode, and the other end of the fifth resistor is respectively connected to one end of the sixth resistor and the TYPEC_2_EN_N pin of the TYPEC2 power supply, and one end of the sixth resistor is grounded, so as to enable the TYPE-C2 power supply to output a voltage signal.

10. The switching circuit for multiple TYPE-C, DC power input according to claim 9, characterized in that: The third switching module also includes a second buffer unit for enabling the voltage signal output by the TYPEC2 power supply to be transmitted smoothly.

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