Automatic power switching devices and electronic equipment

Abstract

This application discloses an automatic power switching device and electronic equipment, including a dry cell battery module, a lithium battery module, a Type-C interface, a first switch module, and a second switch module. The input terminal of the Type-C interface is electrically connected to an external power source. The positive output terminal of the Type-C interface is electrically connected to a first control terminal and a second control terminal of the first switch module, and the power supply terminal of the electronic equipment. The first input terminal of the first switch module is electrically connected to the positive power supply terminal of the lithium battery module. The second input terminal of the first switch module is electrically connected to the positive output terminal of the dry cell battery module. The first output terminal of the first switch module is electrically connected to the control terminal of the second switch module and the power supply terminal of the electronic equipment. The second output terminal of the first switch module is electrically connected to the input terminal of the second switch module. The output terminal of the second switch module is electrically connected to the power supply terminal of the electronic equipment. This application achieves automatic switching between the Type-C interface, lithium battery, and dry cell battery, meeting the diverse power supply needs of electronic equipment.

Description

Technical Field

[0001] This utility model belongs to the field of power switching technology, specifically relating to an automatic power switching device and electronic equipment. Background Technology

[0002] Portable electronic devices are used in various scenarios due to their small size, light weight, and ability to operate without a fixed power source. In practical applications, portable electronic devices typically employ a dual power supply method, using both dry cell batteries and lithium batteries.

[0003] Electronic devices employing dual power supplies automatically switch between them based on the voltage amplitude of the two power sources. With technological advancements, electronic devices increasingly demand higher power compatibility, and the commonly used automatic switching between dry cell batteries and lithium batteries can no longer meet the diverse power supply needs of electronic devices. Utility Model Content

[0004] In view of this, the present invention provides an automatic power switching device, the main purpose of which is to solve the problem that the current automatic power switching method can no longer meet the diverse power supply needs of electronic devices.

[0005] To address the aforementioned problems, this application provides an automatic power switching device, which includes a dry cell battery module, a lithium battery module, a Type-C interface, a first switch module, and a second switch module, wherein...

[0006] The input terminal of the Type-C interface is electrically connected to an external power source. The positive output terminal of the Type-C interface is electrically connected to the first control terminal and the second control terminal of the first switch module and the power supply terminal of the electronic device, respectively. The first input terminal of the first switch module is electrically connected to the positive power supply terminal of the lithium battery module. The second input terminal of the first switch module is electrically connected to the positive output terminal of the dry cell battery module. The first output terminal of the first switch module is electrically connected to the control terminal of the second switch module and the power supply terminal of the electronic device, respectively. The second output terminal of the first switch module is electrically connected to the input terminal of the second switch module. The output terminal of the second switch module is electrically connected to the power supply terminal of the electronic device.

[0007] In one embodiment of this utility model, optionally, the first switch module includes: a lithium battery switch unit and a dry cell switch unit, wherein the control terminal of the lithium battery switch unit is electrically connected to the positive output terminal of the Type-C interface, the input terminal of the lithium battery switch unit is electrically connected to the positive power terminal of the lithium battery module, and the output terminal of the lithium battery switch unit is electrically connected to the control terminal of the second switch module and the power terminal of the device, respectively; the control terminal of the dry cell switch unit is electrically connected to the positive output terminal of the Type-C interface, the input terminal of the dry cell switch unit is electrically connected to the positive output terminal of the dry cell module, and the output terminal of the dry cell switch unit is electrically connected to the input terminal of the second switch module.

[0008] In one embodiment of this utility model, optionally, the lithium battery switching unit includes a first PMOS transistor, a second PMOS transistor, a first diode, and a first resistor. The gate of the first PMOS transistor is electrically connected to the positive output terminal of the Type-C interface, the anode of the first diode, the gate of the second PMOS transistor, and the first terminal of the first resistor. The drain of the first PMOS transistor is electrically connected to the cathode of the first diode, the power supply terminal of the electronic device, and the control terminal of the second switching module. The source of the first PMOS transistor is electrically connected to the source of the second PMOS transistor, and the drain of the second PMOS transistor is electrically connected to the positive power supply terminal of the lithium battery module. The second terminal of the first resistor is electrically connected to the negative terminal.

[0009] In one embodiment of this utility model, optionally, the dry battery switching unit includes a third PMOS transistor, a fourth PMOS transistor, a second diode, and a second resistor. The gate of the third PMOS transistor is electrically connected to the positive output terminal of the Type-C interface, the anode of the second diode, the gate of the fourth PMOS transistor, and the first terminal of the second resistor, respectively. The drain of the third PMOS transistor is electrically connected to the cathode of the second diode and the input terminal of the second switching module, respectively. The source of the third PMOS transistor is electrically connected to the source of the fourth PMOS transistor, and the drain of the fourth PMOS transistor is electrically connected to the positive output terminal of the dry battery module. The second terminal of the second resistor is electrically connected to the negative terminal.

[0010] In one embodiment of this utility model, optionally, the second switching module includes a fifth PMOS transistor, a sixth PMOS transistor, a third diode, and a third resistor. The gate of the fifth PMOS transistor is electrically connected to the drain of the first PMOS transistor, the cathode of the first diode, the anode of the third diode, the gate of the sixth PMOS transistor, and the first terminal of the third resistor. The drain of the fifth PMOS transistor is electrically connected to the cathode of the third diode and the power supply terminal of the electronic device. The source of the fifth PMOS transistor is electrically connected to the source of the sixth PMOS transistor. The drain of the sixth PMOS transistor is electrically connected to the drain of the third PMOS transistor and the cathode of the second diode. The second terminal of the third resistor is electrically connected to the negative terminal.

[0011] In one embodiment of this utility model, optionally, the power switching module further includes a charging module, wherein the input terminal of the charging module is electrically connected to the positive output terminal of the Type-C interface, and the output terminal of the charging module is electrically connected to the positive power terminal of the lithium battery module.

[0012] In one embodiment of this utility model, optionally, the charging module includes a charging chip and a charging indicator light. The positive input terminal of the charging chip is electrically connected to the positive output terminal of the Type-C interface, and the positive output terminal of the charging chip is electrically connected to the positive power terminal of the lithium battery module. The anode of the charging indicator light is electrically connected to the positive output terminal of the Type-C interface, and the cathode of the charging indicator light is electrically connected to the charging status indicator terminal of the charging chip.

[0013] In one embodiment of this utility model, optionally, when the Type-C interface is connected to an external power source, both the first switch module and the second switch module are in the off state, and the Type-C interface provides power to the electronic device. When the Type-C interface is not connected to an external power source, the first switch module is in the on state, and the lithium battery module or the dry battery module provides power to the electronic device.

[0014] In one embodiment of this utility model, optionally, when the Type-C interface is not connected to an external power source, the first switch module is in a connected state; when the voltage amplitude of the lithium battery module is higher than the voltage amplitude of the dry cell battery module, the second switch module is in a turned-off state, and the lithium battery module provides power to the electronic device; when the voltage amplitude of the lithium battery module is lower than the voltage amplitude of the dry cell battery module, the second switch module is in a connected state, and the dry cell battery module provides power to the electronic device.

[0015] This application also provides a portable electronic device, including the aforementioned automatic power switching device.

[0016] The beneficial effects of this application are as follows: The present invention provides an automatic power switching device and a portable electronic device, which includes a dry cell battery module, a lithium battery module, a Type-C interface, a first switch module, and a second switch module. When an external power source is connected to the Type-C interface, the first switch module is in the off state, disconnecting the connection between the dry cell battery module and the lithium battery module and the electronic device, and the Type-C interface supplies power to the electronic device. When no external power source is connected to the Type-C interface, the first switch module is in the off state, and the second switch module switches between the lithium battery module and the dry cell battery module to supply power to the electronic device according to the voltage amplitude of the lithium battery and the dry cell battery, thereby realizing automatic switching between the Type-C interface, lithium battery, and dry cell battery and meeting the diverse power supply needs of electronic devices.

[0017] The above description is merely an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this utility model more obvious and understandable, specific embodiments of this utility model are given below. Attached Figure Description

[0018] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0019] Figure 1 A structural block diagram of an automatic power switching device as an exemplary embodiment of this utility model;

[0020] Figure 2 A circuit structure diagram of an automatic power switching device, which is an exemplary embodiment of the present invention;

[0021] in,

[0022] Figures 1-2 The labels are as follows: U1 - Dry cell battery module; U2 - Lithium battery module; P - Type-C interface; 14 - First switch module; 15 - Second switch module; 2 - Electronic device; 3 - External power supply; Q1 - First PMOS transistor; Q2 - Second PMOS transistor; Q3 - Third PMOS transistor; Q4 - Fourth PMOS transistor; Q5 - Fifth PMOS transistor; Q6 - Sixth PMOS transistor; D1 - First diode; D2 - Second diode; D3 - Third diode; R1 - First resistor; R2 - Second resistor; R3 - Third resistor; U3 - Charging chip; D4 - Charging indicator light. Detailed Implementation

[0023] The present invention will be described in detail below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0024] To further illustrate the technical means and effects adopted by this utility model to achieve its intended purpose, the specific implementation methods, structures, features, and effects according to this utility model application are described in detail below with reference to the accompanying drawings and preferred embodiments. In the following description, different "an embodiment" or "an embodiment" do not necessarily refer to the same embodiment. Furthermore, specific features, structures, or characteristics in one or more embodiments can be combined in any suitable form.

[0025] The following is combined Figures 1 to 2 This invention describes an automatic power switching device proposed according to some embodiments of the present invention.

[0026] In one embodiment, such as Figure 1 As shown, an automatic power switching device includes a dry cell battery module U1, a lithium battery module U2, a Type-C interface P, a first switch module 14, and a second switch module 15, wherein...

[0027] The input terminal of the Type-C interface P is electrically connected to the external power supply 3. The positive output terminal of the Type-C interface P is electrically connected to the first control terminal and the second control terminal of the first switch module 14 and the power supply terminal of the electronic device 2, respectively. The first input terminal of the first switch module 14 is electrically connected to the positive power supply terminal of the lithium battery module U2. The second input terminal of the first switch module 14 is electrically connected to the positive output terminal of the dry battery module U1. The first output terminal of the first switch module 14 is electrically connected to the control terminal of the second switch module 15 and the power supply terminal of the electronic device 2, respectively. The second output terminal of the first switch module 14 is electrically connected to the input terminal of the second switch module 15. The output terminal of the second switch module 15 is electrically connected to the power supply terminal of the electronic device 2.

[0028] Specifically, this application employs three power supply methods: lithium battery, dry cell battery, and Type-C interface. For example, the dry cell battery supports 1-2 batteries (1.5V-6V), the lithium battery is a 3.7V lithium battery, and the Type-C interface supports fast charging protocols and is compatible with fast charging. It should be noted that the negative terminals of the lithium battery, the dry cell battery, and the Type-C interface are connected together. The first and second switching modules are each composed of multiple MOSFETs. When the Type-C interface is connected to an external power source, the MOSFETs can quickly respond to the control signal, and the first switching module is in the off state, causing the dry cell battery and lithium battery to be quickly disconnected from the electronic device, and the Type-C interface supplies power to the electronic device. When the Type-C interface is not connected to an external power source, the first switching module is in the on state. The switching state of the second switching module determines whether the dry cell battery or the lithium battery supplies power to the electronic device. When the second switching module is in the off state, the lithium battery supplies power to the electronic device; when the second switching module is in the on state, the dry cell battery supplies power to the electronic device.

[0029] In this embodiment, when the Type-C interface P is connected to an external power source, both the first switch module 14 and the second switch module 15 are in the off state, and the Type-C interface P provides power to the electronic device 2. When the Type-C interface P is not connected to an external power source, the first switch module 14 is in the connected state, and the lithium battery module U2 or the dry battery module U1 provides power to the electronic device 2.

[0030] In this embodiment, when the Type-C interface P is not connected to an external power source, the first switch module 14 is in the connected state. When the voltage amplitude of the lithium battery module U2 is higher than that of the dry battery module U1, the second switch module 15 is in the off state, and the lithium battery module U2 provides power to the electronic device 2. When the voltage amplitude of the lithium battery module U2 is lower than that of the dry battery module U1, the second switch module 15 is in the connected state, and the dry battery module U1 provides power to the electronic device 2.

[0031] Compared with the prior art, the automatic power switching device provided by this utility model is equipped with a dry battery module, a lithium battery module, a Type-C interface, a first switch module, and a second switch module. When an external power source is connected to the Type-C interface, the first switch module is in the off state, disconnecting the connection between the dry battery module and the lithium battery module and the electronic device, and the Type-C interface supplies power to the electronic device. When no external power source is connected to the Type-C interface, the first switch module is in the off state, and the second switch module switches between the lithium battery module and the dry battery module to supply power to the electronic device according to the voltage amplitude of the lithium battery and the dry battery, realizing automatic switching between the Type-C interface, lithium battery, and dry battery, and meeting the diverse power supply needs of electronic devices.

[0032] In one embodiment, the first switch module 14 includes a lithium battery switch unit and a dry cell switch unit. The control terminal of the lithium battery switch unit is electrically connected to the positive output terminal of the Type-C interface P, the input terminal of the lithium battery switch unit is electrically connected to the positive power terminal of the lithium battery module U2, and the output terminal of the lithium battery switch unit is electrically connected to the control terminal of the second switch module 15 and the power terminal of the device, respectively. The control terminal of the dry cell switch unit is electrically connected to the positive output terminal of the Type-C interface P, the input terminal of the dry cell switch unit is electrically connected to the positive output terminal of the dry cell module U1, and the output terminal of the dry cell switch unit is electrically connected to the input terminal of the second switch module 15.

[0033] Specifically, when the Type-C interface is connected to an external power source, the MOSFETs of the lithium battery switching unit and the dry cell battery switching unit quickly respond to the control signal, enabling rapid shutdown between the dry cell battery and the lithium battery and the electronic device, and the Type-C interface supplies power to the electronic device. When the Type-C interface is not connected to an external power source, the MOSFETs of the lithium battery switching unit and the dry cell battery switching unit quickly respond to the control signal and are in the on state. The switching state of the second switching module determines whether the dry cell battery or the lithium battery supplies power to the electronic device.

[0034] In one embodiment, see Figure 2 The lithium battery switching unit includes a first PMOS transistor Q1, a second PMOS transistor Q4, a first diode D1, and a first resistor R1. The gate of the first PMOS transistor Q1 is electrically connected to the positive output terminal of the Type-C interface P, the anode of the first diode D1, the gate of the second PMOS transistor Q2, and the first terminal of the first resistor R1. The drain of the first PMOS transistor Q1 is electrically connected to the cathode of the first diode D1, the power supply terminal of the electronic device 2, and the control terminal of the second switching module 15. The source of the first PMOS transistor Q1 is electrically connected to the source of the second PMOS transistor Q2, and the drain of the second PMOS transistor Q2 is electrically connected to the positive power supply terminal of the lithium battery module U2. The second terminal of the first resistor R1 is electrically connected to the negative terminal.

[0035] Specifically, both the first and second PMOS transistors are equipped with parasitic body diodes. When the Type-C interface is connected to an external power source, the positive output terminal of the Type-C interface P is a high-voltage signal. Since the positive output terminal of the Type-C interface P is connected to the gate of the first PMOS transistor, the gate of the first PMOS transistor is a high-voltage signal. The gate voltage of the first PMOS transistor is transmitted to the source of the first PMOS transistor through the first diode and the parasitic body diode. Due to the voltage drop through the first diode and the parasitic body diode, the source voltage of the first PMOS transistor is lower than the gate voltage, so the first PMOS transistor is turned off. Since the source of the second PMOS transistor is connected to the source of the first PMOS transistor, and the gate of the second PMOS transistor is connected to the gate of the first PMOS transistor, the source voltage of the second PMOS transistor is also lower than the gate voltage, so the second PMOS transistor is also turned off. The positive terminal of the lithium battery is disconnected from the power supply terminal of the electronic device.

[0036] When the Type-C interface is not connected to an external power source, the positive output terminal of the Type-C interface P is a low voltage signal. The gate of the first PMOS transistor is connected to the positive output terminal of the Type-C interface P, so the gate of the first PMOS transistor is a low voltage signal. Since the drain of the second PMOS transistor is connected to the positive terminal of the lithium battery power supply, the positive terminal voltage of the lithium battery power supply is transmitted to the source of the second PMOS transistor through the parasitic body diode of the second PMOS transistor, so the source of the second PMOS transistor is a high voltage signal. The gate of the second PMOS transistor is connected to the gate of the first PMOS transistor, so the gate of the second PMOS transistor is a low voltage signal. The source voltage of the second PMOS transistor is higher than the gate voltage of the second PMOS transistor, so the second PMOS transistor is turned on. Because the second PMOS transistor is turned on, its source is connected to the source of the first PMOS transistor. The source of the first PMOS transistor is a high voltage signal, and its gate is a low voltage signal. Since the source voltage of the first PMOS transistor is higher than its gate voltage, the first PMOS transistor is turned on. The positive terminal of the lithium battery's power supply is connected to the power output terminal through the first and second PMOS transistors.

[0037] In one embodiment, see Figure 2The dry cell battery switching unit includes a third PMOS transistor Q3, a fourth PMOS transistor Q4, a second diode D2, and a second resistor R2. The gate of the third PMOS transistor Q3 is electrically connected to the positive output terminal of the Type-C interface P, the anode of the second diode D2, the gate of the fourth PMOS transistor Q4, and the first terminal of the second resistor R2. The drain of the third PMOS transistor Q3 is electrically connected to the cathode of the second diode D2 and the input terminal of the second switching module 15. The source of the third PMOS transistor Q3 is electrically connected to the source of the fourth PMOS transistor Q4. The drain of the fourth PMOS transistor Q4 is electrically connected to the positive output terminal of the dry cell battery module U1. The second terminal of the second resistor R2 is electrically connected to the negative terminal.

[0038] Specifically, both the third and fourth PMOS transistors have parasitic body diodes. When the Type-C interface is connected to an external power source, the positive output terminal of the Type-C interface P is a high-voltage signal. Since the positive output terminal of the Type-C interface P is connected to the gate of the third PMOS transistor, the gate of the third PMOS transistor is a high-voltage signal. The gate voltage of the third PMOS transistor is transmitted to the source of the third PMOS transistor through the second diode and the parasitic body diode. Due to the voltage drop through the second diode and the parasitic body diode, the source voltage of the third PMOS transistor is lower than the gate voltage, so the third PMOS transistor is turned off. Since the source of the fourth PMOS transistor is connected to the source of the third PMOS transistor, and the gate of the fourth PMOS transistor is connected to the gate of the third PMOS transistor, the source voltage of the fourth PMOS transistor is also lower than the gate voltage, so the fourth PMOS transistor is also turned off. The positive terminal of the dry cell battery is disconnected from the power supply terminal of the electronic device.

[0039] When the Type-C interface is not connected to an external power source, the positive output terminal of the Type-C interface P is a low voltage signal. The gate of the third PMOS transistor is connected to the positive output terminal of the Type-C interface P, so the gate of the third PMOS transistor is a low voltage signal. Since the drain of the fourth PMOS transistor is connected to the positive terminal of the dry cell battery, the voltage of the positive terminal of the dry cell battery is transmitted to the source of the fourth PMOS transistor through the parasitic body diode of the fourth PMOS transistor, so the source of the fourth PMOS transistor is a high voltage signal. The gate of the fourth PMOS transistor is connected to the gate of the third PMOS transistor, so the gate of the fourth PMOS transistor is a low voltage signal. The source voltage of the fourth PMOS transistor is higher than the gate voltage of the fourth PMOS transistor, so the fourth PMOS transistor is turned on. Because the fourth PMOS transistor is turned on, its source is connected to the source of the third PMOS transistor. The source of the third PMOS transistor is a high voltage signal, and its gate is a low voltage signal. The source voltage of the third PMOS transistor is higher than its gate voltage, so the third PMOS transistor is turned on. The positive terminal of the dry cell power supply is connected to the power output terminal through the third and fourth PMOS transistors.

[0040] In one embodiment, see Figure 2 The second switching module 15 includes a fifth PMOS transistor Q5, a sixth PMOS transistor Q6, a third diode D3, and a third resistor R3. The gate of the fifth PMOS transistor Q5 is electrically connected to the drain of the first PMOS transistor Q1, the cathode of the first diode D1, the anode of the third diode D3, the gate of the sixth PMOS transistor Q6, and the first terminal of the third resistor R3. The drain of the fifth PMOS transistor Q5 is electrically connected to the cathode of the third diode D3 and the power supply terminal of the electronic device 2. The source of the fifth PMOS transistor Q5 is electrically connected to the source of the sixth PMOS transistor Q6. The drain of the sixth PMOS transistor Q6 is electrically connected to the drain of the third PMOS transistor Q3 and the cathode of the second diode D2. The second terminal of the third resistor R3 is electrically connected to the negative terminal.

[0041] Specifically, when the power supply voltage of the lithium battery is higher than that of the dry cell battery, both the fifth and sixth PMOS transistors have parasitic body diodes. When the Type-C interface is not connected to an external power source, the first, second, third, and fourth PMOS transistors are all turned on. Since the drain of the first PMOS transistor is connected to the gate of the fifth PMOS transistor, the drain of the first PMOS transistor is a high voltage signal, and the gate of the fifth PMOS transistor is also a high voltage signal. The gate voltage of the fifth PMOS transistor is then transmitted through the second diode and the fifth PMOS transistor. The parasitic diode transmits power to the source of the fifth PMOS transistor. Due to the voltage drop after passing through the second diode and the parasitic diode, the source voltage of the fifth PMOS transistor is lower than its gate voltage, so the fifth PMOS transistor is turned off. Since the source of the sixth PMOS transistor is connected to the source of the fifth PMOS transistor, and the gate of the sixth PMOS transistor is connected to the gate of the fifth PMOS transistor, the source voltage of the sixth PMOS transistor is also lower than its gate voltage, so the sixth PMOS transistor is also turned off. The positive terminal of the dry cell battery is disconnected from the power supply terminal of the electronic device.

[0042] When the power supply voltage of the lithium battery is lower than that of the dry cell battery, the gate of the fifth PMOS transistor is connected to the drain of the first PMOS transistor. Therefore, the positive output terminal of the Type-C interface P is low, and the gate of the fifth PMOS transistor is a low voltage signal. The drain of the sixth PMOS transistor is connected to the positive terminal of the dry cell battery. The voltage of the positive terminal of the dry cell battery is transmitted to the source of the sixth PMOS transistor through the parasitic body diode of the sixth PMOS transistor. The gate of the sixth PMOS transistor is connected to the gate of the fifth PMOS transistor. Therefore, the gate of the sixth PMOS transistor is a low voltage signal. The source voltage of the sixth PMOS transistor is higher than the gate voltage of the sixth PMOS transistor, and the sixth PMOS transistor is turned on. Because the sixth PMOS transistor is turned on, its source is a high voltage signal. The source of the sixth PMOS transistor is connected to the source of the fifth PMOS transistor. The source voltage of the fifth PMOS transistor is higher than its gate voltage. Therefore, the fifth PMOS transistor is turned on, and the positive terminal of the dry cell power supply is connected to the power output terminal through the fifth and sixth PMOS transistors.

[0043] In the dry cell battery switching unit, lithium battery switching unit, and second switching module, a dual PMOS transistor connection method is used. The core of this method lies in utilizing the switching characteristics of PMOS transistors to achieve precise control of current flow. PMOS transistors (metal-oxide-semiconductor field-effect transistors) are voltage-controlled devices. By controlling the gate voltage, the source and drain can be turned on or off, preventing the battery from continuing to discharge during charging, improving charging efficiency, and protecting the battery and equipment from unnecessary current surges.

[0044] In this circuit design, two PMOS transistors work together. When no external power supply is plugged into the Type-C interface, the dual PMOS transistors are turned on by appropriately setting the gate voltage, allowing a dry cell battery or lithium battery to power the device. Specifically, the dry cell battery and lithium battery are connected to the source or drain of the corresponding PMOS transistor, respectively. When the PMOS transistor is turned on, current flows from the battery to the load.

[0045] When an external power source is plugged into the Type-C interface, the control circuit responds quickly, changing the gate voltage of the PMOS transistors connected to the lithium battery and dry cell battery, causing both PMOS transistors to turn off. At this time, the interfaces of the dry cell battery and lithium battery are disconnected, avoiding potential current conflicts between the battery and the external power source, ensuring the safe and stable operation of the circuit. The dual PMOS transistors use a reverse-connected circuit layout, enhancing the control over current flow. Under normal circumstances, current flows from the battery to the load, and the PMOS transistors are forward-biased. However, in abnormal situations (such as external power supply voltage fluctuations, reversed battery polarity, etc.) that might cause reverse current flow, the reverse-connected PMOS transistors prevent the current from flowing in the opposite direction. Because the PMOS transistors are in the off state when the current reverses, they cannot form a conduction path, effectively preventing reverse current flow, protecting the battery and device circuitry, reducing the risk of short circuits and battery damage, and greatly improving the stability and safety of the entire power supply system.

[0046] By replacing diodes with PMOS transistors, the on-state voltage drop is less than 0.1V, which improves switching efficiency and enables seamless switching.

[0047] In one embodiment, the power switching module further includes a charging module, the input terminal of which is electrically connected to the positive output terminal of the Type-C interface, and the output terminal of which is electrically connected to the positive power terminal of the lithium battery module U2.

[0048] Specifically, when the Type-C interface is connected to an external power source, the external power source supplies power to the electronic device and also charges the lithium battery module. The charging module also processes the electrical energy, for example:

[0049] Voltage compatibility: The output voltage of the external Type-C interface (e.g., 5V) may not match the charging voltage of the lithium battery (e.g., a 3.7V lithium battery usually requires a 4.2V charging voltage). The charging module will adjust the voltage to the appropriate range.

[0050] Current control: To prevent excessive current from damaging the lithium battery, current limiting protection ensures charging safety (e.g., current regulation during fast charging of lithium batteries).

[0051] Status management: This may include overcharge protection and power-off when fully charged to prevent lithium batteries from being damaged by overcharging.

[0052] In one embodiment, see Figure 2 The charging module includes a charging chip U3 and a charging indicator D4. The positive input terminal of the charging chip U3 is electrically connected to the positive output terminal of the Type-C interface P, and the positive output terminal of the charging chip U3 is electrically connected to the positive power terminal of the lithium battery module U2. The anode of the charging indicator D4 is electrically connected to the positive output terminal of the Type-C interface P, and the cathode of the charging indicator D4 is electrically connected to the charging status indicator terminal of the charging chip U3.

[0053] Specifically, the charging chip is the "brain" of the charging module, responsible for managing the entire charging process. For example, it detects whether an external power source (Type-C interface) is connected, dynamically adjusts charging parameters (voltage and current) according to the state of the lithium battery module (such as power and temperature), and outputs charging status signals through the charging status indicator terminal to intuitively display the charging status, such as informing the user of the current battery charging status through the on / off state or color change of the charging status indicator light.

[0054] This application also provides a portable electronic device, including the aforementioned automatic power switching device.

[0055] Compared with the prior art, the portable electronic device provided by this utility model is equipped with a dry battery module, a lithium battery module, a Type-C interface, a first switch module, and a second switch module. When an external power source is connected to the Type-C interface, the first switch module is in the off state, disconnecting the connection between the dry battery module and the lithium battery module and the electronic device, and the Type-C interface supplies power to the electronic device. When no external power source is connected to the Type-C interface, the first switch module is in the off state, and the second switch module switches between the lithium battery module and the dry battery module to supply power to the electronic device according to the voltage amplitude of the lithium battery and the dry battery, realizing automatic switching between the Type-C interface, lithium battery, and dry battery, and meeting the diverse power supply needs of the electronic device.

[0056] It should be understood that various modifications can be made to the embodiments described herein. Therefore, the above description should not be considered as limiting, but merely as an example of embodiments. Other modifications within the scope and spirit of this application will be apparent to those skilled in the art.

[0057] The accompanying drawings, which are included in and form part of this specification, illustrate embodiments of the present application and, together with the general description of the present application given above and the detailed description of the embodiments given below, serve to explain the principles of the present application.

[0058] These and other features of this application will become apparent from the following description of preferred forms of embodiments given as non-limiting examples, with reference to the accompanying drawings.

[0059] It should also be understood that although this application has been described with reference to some specific examples, those skilled in the art can certainly implement many other equivalent forms of this application.

[0060] The above and other aspects, features and advantages of this application will become more apparent when taken in conjunction with the accompanying drawings and in view of the following detailed description.

[0061] Specific embodiments of this application are described thereafter with reference to the accompanying drawings; however, it should be understood that the claimed embodiments are merely examples of this application, which can be implemented in various ways. Well-known and / or repeated functions and structures are not described in detail to avoid unnecessary or redundant details that could obscure the application. Therefore, the specific structural and functional details claimed herein are not intended to be limiting, but merely serve as the basis and representative basis for the claims to teach those skilled in the art to use this application in a variety of substantially any suitable detailed structures.

[0062] This specification may use the phrases “in one embodiment,” “in another embodiment,” “in yet another embodiment,” or “in other embodiments,” all of which may refer to one or more of the same or different embodiments according to this application.

[0063] The above embodiments are merely exemplary embodiments of this application and are not intended to limit this application. The scope of protection of this application is defined by the claims. Those skilled in the art can make various modifications or equivalent substitutions to this application within its substance and scope of protection, and such modifications or equivalent substitutions should also be considered to fall within the scope of protection of this application.

Claims

1. A power supply automatic switching device, characterized by comprising: The automatic power switching device includes a dry cell battery module, a lithium battery module, a Type-C interface, a first switch module, and a second switch module, wherein... The input terminal of the Type-C interface is electrically connected to an external power source. The positive output terminal of the Type-C interface is electrically connected to the first control terminal and the second control terminal of the first switch module and the power supply terminal of the electronic device, respectively. The first input terminal of the first switch module is electrically connected to the positive power supply terminal of the lithium battery module. The second input terminal of the first switch module is electrically connected to the positive output terminal of the dry cell battery module. The first output terminal of the first switch module is electrically connected to the control terminal of the second switch module and the power supply terminal of the electronic device, respectively. The second output terminal of the first switch module is electrically connected to the input terminal of the second switch module. The output terminal of the second switch module is electrically connected to the power supply terminal of the electronic device.

2. The power transfer device of claim 1, wherein, The first switching module includes: a lithium battery switching unit and a dry cell battery switching unit, wherein, The control terminal of the lithium battery switch unit is electrically connected to the positive output terminal of the Type-C interface, the input terminal of the lithium battery switch unit is electrically connected to the positive power terminal of the lithium battery module, and the output terminal of the lithium battery switch unit is electrically connected to the control terminal of the second switch module and the power terminal of the device, respectively. The control terminal of the dry cell switch unit is electrically connected to the positive output terminal of the Type-C interface, the input terminal of the dry cell switch unit is electrically connected to the positive output terminal of the dry cell module, and the output terminal of the dry cell switch unit is electrically connected to the input terminal of the second switch module.

3. The power transfer device of claim 2, wherein, The lithium battery switching unit includes a first PMOS transistor, a second PMOS transistor, a first diode, and a first resistor. The gate of the first PMOS transistor is electrically connected to the positive output terminal of the Type-C interface, the anode of the first diode, the gate of the second PMOS transistor, and the first terminal of the first resistor. The drain of the first PMOS transistor is electrically connected to the cathode of the first diode, the power supply terminal of the electronic device, and the control terminal of the second switching module. The source of the first PMOS transistor is electrically connected to the source of the second PMOS transistor, and the drain of the second PMOS transistor is electrically connected to the positive power supply terminal of the lithium battery module. The second terminal of the first resistor is electrically connected to the negative terminal.

4. The power transfer device of claim 3, wherein the power transfer device is configured to: The dry cell battery switching unit includes a third PMOS transistor, a fourth PMOS transistor, a second diode, and a second resistor. The gate of the third PMOS transistor is electrically connected to the positive output terminal of the Type-C interface, the anode of the second diode, the gate of the fourth PMOS transistor, and the first terminal of the second resistor. The drain of the third PMOS transistor is electrically connected to the cathode of the second diode and the input terminal of the second switching module. The source of the third PMOS transistor is electrically connected to the source of the fourth PMOS transistor, and the drain of the fourth PMOS transistor is electrically connected to the positive output terminal of the dry cell battery module. The second terminal of the second resistor is electrically connected to the negative terminal.

5. The automatic power switching device according to claim 4, characterized in that, The second switching module includes a fifth PMOS transistor, a sixth PMOS transistor, a third diode, and a third resistor. The gate of the fifth PMOS transistor is electrically connected to the drain of the first PMOS transistor, the cathode of the first diode, the anode of the third diode, the gate of the sixth PMOS transistor, and the first terminal of the third resistor. The drain of the fifth PMOS transistor is electrically connected to the cathode of the third diode and the power supply terminal of the electronic device. The source of the fifth PMOS transistor is electrically connected to the source of the sixth PMOS transistor. The drain of the sixth PMOS transistor is electrically connected to the drain of the third PMOS transistor and the cathode of the second diode. The second terminal of the third resistor is electrically connected to the negative terminal.

6. The power transfer device of claim 1, wherein, The power switching module also includes a charging module, the input terminal of which is electrically connected to the positive output terminal of the Type-C interface, and the output terminal of which is electrically connected to the positive power terminal of the lithium battery module.

7. The power transfer device of claim 6, wherein the power transfer device is configured to: The charging module includes a charging chip and a charging indicator light. The positive input terminal of the charging chip is electrically connected to the positive output terminal of the Type-C interface, and the positive output terminal of the charging chip is electrically connected to the positive power terminal of the lithium battery module. The anode of the charging indicator light is electrically connected to the positive output terminal of the Type-C interface, and the cathode of the charging indicator light is electrically connected to the charging status indicator terminal of the charging chip.

8. The power transfer device of any one of claims 1-7, wherein, When the Type-C interface is connected to an external power source, both the first switch module and the second switch module are in the off state, and the Type-C interface provides power to the electronic device. When the Type-C interface is not connected to an external power source, the first switch module is in the on state, and the lithium battery module or the dry battery module provides power to the electronic device.

9. The power transfer device of claim 8, wherein, When the Type-C interface is not connected to an external power source, the first switch module is in the ON state. When the voltage amplitude of the lithium battery module is higher than that of the dry cell battery module, the second switch module is in the OFF state, and the lithium battery module provides power to the electronic device. When the voltage amplitude of the lithium battery module is lower than that of the dry cell battery module, the second switch module is in the ON state, and the dry cell battery module provides power to the electronic device.

10. A portable electronic device, characterized in that The automatic power switching device includes any one of claims 1-9.

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