A dual-circuit power supply system and control method for a battery-powered product

Abstract

The application discloses a kind of to be related to daily life using built-in battery power supply electronic product field, specifically to a kind of battery-powered product's built-in battery plus external power supply double-loop power supply system and control method, system includes negative electrode export pole piece, positive electrode export pole piece, external power supply equipment, thin flexible conductive component and power supply switching control circuit.When using, by the positive and negative pole loop export pole piece is inserted between the positive and negative pole of battery-powered product built-in battery group and respective load end export each power supply loop, exported each power supply loop is connected to the thin flexible conductive component, the thin flexible conductive component passes through the gap between the battery compartment and battery box cover of battery-powered product and the external power supply equipment is established electrical connection, so as to provide power supply for battery-powered product by the external power supply equipment or battery-powered product built-in battery group by power supply switching control circuit selection to provide power supply for battery-powered product.The system and method provided by the application can realize the double-loop power supply of external main power supply and battery-powered product built-in battery backup power supply of the product without disassembling battery-powered product, thereby greatly reducing the replacement frequency of battery-powered product built-in battery.

Description

Technical Field

[0001] This invention relates to the field of electronic products powered by built-in batteries used in daily life, and particularly to a dual-circuit power supply system and control method for battery-powered products consisting of a built-in battery and an external power source. Background Technology

[0002] Modern society widely uses products powered by built-in batteries, such as smart door locks, wall clocks, and remote controls. During the use of these products, batteries need to be constantly replaced when they run out, causing anxiety for users who worry about the battery running out. Furthermore, discarded batteries pollute the environment. In view of this, this invention innovatively proposes a dual-circuit power supply system for battery-powered products, combining a built-in battery with an external power source. This invention allows the product to prioritize external power, switching to the built-in battery when the external power supply is insufficient. Thus, during product use, external power is prioritized, and the built-in battery can serve as a backup or be used directly from the external power source without replacement. The system and method provided by this invention can achieve both external main power and built-in battery backup power without disassembling the product, thereby reducing the frequency of built-in battery replacements, alleviating user anxiety about the product's inability to function after battery depletion, and reducing the cost of building-in battery replacements and the environmental impact of discarded batteries. Summary of the Invention

[0003] This invention addresses existing battery-powered products by providing a system and control method that enables both external main power supply and internal battery backup power supply without disassembling the product, thus resolving issues arising from relying solely on the internal battery. For example, it significantly reduces the frequency of internal battery replacements, alleviates user anxiety about the product failing after battery depletion, and reduces replacement costs and the environmental impact of discarded batteries.

[0004] To achieve the above objectives, the present invention provides a dual-circuit power supply system for a battery-powered product, consisting of a built-in battery and an external power supply, characterized in that it includes: a negative electrode outlet plate, a positive electrode outlet plate, an external power supply device, a thin flexible conductive component, and a power supply switching control circuit. The negative electrode output electrode includes a double-surface conductor structure, namely a negative electrode power supply surface and a negative electrode load surface, which is placed between the negative electrode and the negative electrode load end of the battery pack inside the battery compartment of the battery-powered product to conduct electrical connection; the negative electrode power supply surface is connected to the negative electrode of the battery pack inside the battery-powered product, and the negative electrode load surface is connected to the negative load electrode in the battery-powered product; The positive electrode leads out plate includes a double-surface conductor structure, namely a positive power supply surface and a positive load surface, which is placed between the positive terminal and the positive load terminal of the built-in battery pack in the battery compartment of the battery-powered product to conduct electrical connection; the positive power supply surface is connected to the positive terminal of the built-in battery pack in the battery-powered product, and the positive load surface is connected to the positive load terminal in the battery-powered product; The external power supply device includes an external DC power supply; The thin, flexible conductive component is used to pass through the gap between the battery compartment and the battery box cover of the battery-powered product to establish the electrical connection and control relationship between the negative power supply surface, the negative load surface, the positive power supply surface, the positive load surface and the external power supply device. The power supply switching control circuit includes a first power interface, a second power interface, a load interface, and a switching execution unit; the first power interface includes a first power negative terminal and a first power positive terminal; the second power interface includes a second power negative terminal and a second power positive terminal; the load interface includes a load negative terminal and a load positive terminal. The first power interface connects to an external DC power supply, i.e., the first negative terminal is connected to the negative terminal of the external DC power supply, and the first positive terminal is connected to the positive terminal of the external DC power supply; the second power interface connects to the built-in battery pack of the battery-powered product, i.e., the second negative terminal is connected to the negative power supply side and then to the negative terminal of the built-in battery pack of the battery-powered product, and the second positive terminal is connected to the positive power supply side and then to the positive terminal of the built-in battery pack of the battery-powered product; the load interface connects to the load end of the battery-powered product, i.e., the load negative terminal is connected to the negative load side and then to the negative terminal of the load in the battery-powered product, and the load positive terminal is connected to the positive load side and then to the positive terminal of the load in the battery-powered product; The switching execution unit is connected to the first power interface, the second power interface and the load interface, and is used to selectively conduct and isolate at least one of the positive path and the negative path, so as to selectively conduct the first power interface or the second power interface to the load interface.

[0005] In one embodiment, the switching execution unit includes a first positive branch, a second positive branch, a first negative branch, and a second negative branch. The first positive branch is disposed between the positive terminal of the first power supply and the positive terminal of the load; the second positive branch is disposed between the positive terminal of the second power supply and the positive terminal of the load; the first negative branch is disposed between the negative terminal of the first power supply and the negative terminal of the load; and the second negative branch is disposed between the negative terminal of the second power supply and the negative terminal of the load. When the first power interface is selected to be connected to the load interface, the first positive branch and the first negative branch are connected, and at least one of the second positive branch and the second negative branch is disconnected. When the second power interface is selected to be connected to the load interface, the second positive branch and the second negative branch are connected, and at least one of the first positive branch and the first negative branch is disconnected. When necessary, at least one of the first positive branch and the first negative branch, and at least one of the second positive branch and the second negative branch, can be disconnected, and the load interface is de-energized.

[0006] In one embodiment, the switching execution unit includes a first positive branch and a second positive branch; the first power supply negative terminal, the second power supply negative terminal, and the load negative terminal are connected to a common negative terminal node. The first positive branch is located between the first power supply positive terminal and the load positive terminal, and the second positive branch is located between the second power supply positive terminal and the load positive terminal. When the first power interface is selected to be connected to the load interface, the first positive branch is connected and the second positive branch is disconnected; when the second power interface is selected to be connected to the load interface, the second positive branch is connected and the first positive branch is disconnected. When necessary, the first positive branch and the second positive branch are disconnected, and the load interface is de-energized. The second power supply negative terminal and the load negative terminal need to be connected together, that is, the negative power supply surface and the negative load surface of the negative electrode outlet plate need to be electrically connected. This electrical connection can be established through a conductor line, or the negative electrode outlet plate can be made into a single conductor to achieve the electrical connection.

[0007] In one embodiment, the switching execution unit includes a first negative branch and a second negative branch; the first power supply positive terminal, the second power supply positive terminal, and the load positive terminal are connected to a common positive node; the first negative branch is located between the first power supply negative terminal and the load negative terminal, and the second negative branch is located between the second power supply negative terminal and the load negative terminal; when the first power interface is selected to be connected to the load interface, the first negative branch is connected and the second negative branch is disconnected; when the second power interface is selected to be connected to the load interface, the second negative branch is connected and the first negative branch is disconnected. When necessary, the first negative branch and the second negative branch are disconnected, and the load interface is de-energized. The second power supply positive terminal and the load positive terminal need to be connected together, that is, the positive power surface and the positive load surface of the positive electrode outlet plate need to be electrically connected. This electrical connection can be established through a conductor line, or the positive electrode outlet plate can be made into a single conductor to achieve the electrical connection.

[0008] Furthermore, the first positive branch, the second switching branch, the first negative branch, and the second negative branch are implemented using one or a combination of diodes, ideal diodes, and switching devices.

[0009] In one embodiment, the power supply switching control circuit further includes a detection unit and a processing control unit. The switching execution unit includes a first positive switching device branch, a second positive switching device branch, a first negative switching device branch, and a second negative switching device branch. The first positive switching device branch is disposed between the first power supply positive terminal and the load positive terminal; the second positive switching device branch is disposed between the second power supply positive terminal and the load positive terminal; the first negative switching device branch is disposed between the first power supply negative terminal and the load negative terminal; and the second negative switching device branch is disposed between the second power supply negative terminal and the load negative terminal. The detection unit is connected to the first power interface and... The second power interface is connected to the processing control unit, which is connected to the detection unit, the first positive switching device branch, the second positive switching device branch, the first negative switching device branch, and the second negative switching device branch. The detection unit detects voltage parameters of the first and second power interfaces. The processing control unit outputs a control signal based on the voltage parameters. The switching execution unit selectively connects the first or second power interface to the load interface based on the control signal. When the first power interface is connected to the load interface, the first positive switching device branch and the first negative switching device branch are connected, and at least one of the second positive and second negative switching device branches is disconnected. When the second power interface is connected to the load interface, the second positive switching device branch and the second negative switching device branch are connected, and at least one of the first positive and first negative switching device branches is disconnected. When necessary, at least one of the first positive switching device branch and the first negative switching device branch can be shut off, and at least one of the second positive switching device branch and the second negative switching device branch can be shut off, thereby de-energizing the load interface.

[0010] In one embodiment, the power supply switching control circuit further includes a detection unit and a processing control unit. The switching execution unit includes a first positive switching device branch and a second positive switching device branch. The first power supply negative terminal, the second power supply negative terminal, and the load negative terminal are connected to a common negative terminal node. The first positive switching device branch is disposed between the first power supply positive terminal and the load positive terminal, and the second positive switching device branch is disposed between the second power supply positive terminal and the load positive terminal. The detection unit is connected to the first power interface, the second power interface, and the processing control unit. The processing control unit is connected to the detection unit, the first positive switching device branch, the second power interface, and the processing control unit. The first positive switch branch and the second positive switch branch are connected. The detection unit detects the voltage parameters of the first power interface and the second power interface. The processing control unit outputs a control signal according to the voltage parameters. The switching execution unit selectively connects the first power interface or the second power interface to the load interface according to the control signal. When the first power interface is connected to the load interface, the first positive switch branch is connected and the second positive switch branch is disconnected. When the second power interface is connected to the load interface, the second positive switch branch is connected and the first positive switch branch is disconnected. When necessary, the first positive switch branch and the second positive switch branch are disconnected, and the load interface is de-energized. The negative terminal of the second power supply and the negative terminal of the load need to be connected together, that is, the negative power surface and the negative load surface of the negative electrode outlet plate need to be electrically connected. This electrical connection can be established through a conductor line or by making the negative electrode outlet plate into a single conductor.

[0011] In one embodiment, the power supply switching control circuit further includes a detection unit and a processing control unit. The switching execution unit includes a first negative switching device branch and a second negative switching device branch. The first power supply positive terminal, the second power supply positive terminal, and the load positive terminal are connected to a common positive terminal node. The first negative switching device branch is disposed between the first power supply negative terminal and the load negative terminal, and the second negative switching device branch is disposed between the second power supply negative terminal and the load negative terminal. The detection unit is connected to the first power interface, the second power interface, and the processing control unit. The processing control unit is connected to the detection unit and the first negative terminal... The switching device branch and the second negative switching device branch are connected. The detection unit detects the voltage parameters of the first power interface and the second power interface. The processing control unit outputs a control signal according to the voltage parameters. The switching execution unit selectively connects the first power interface or the second power interface to the load interface according to the control signal. When the first power interface is connected to the load interface, the first negative switching device branch is connected and the second negative switching device branch is disconnected. When the second power interface is connected to the load interface, the second negative switching device branch is connected and the first negative switching device branch is disconnected. When necessary, the first negative switching device branch and the second negative switching device branch are disconnected, and the load interface is de-energized. The positive terminal of the second power supply and the positive terminal of the load need to be connected together, that is, the positive power surface and the positive load surface of the positive electrode outlet plate need to be electrically connected. This electrical connection can be established through a conductor line or by making the positive electrode outlet plate into a single conductor.

[0012] Furthermore, the switching devices in the first positive switching device branch, the second positive switching device branch, the first negative switching device branch, and the second negative switching device branch include one or more of field-effect transistors, relays, and bipolar transistors.

[0013] In various embodiments, there may be situations where the DC power supply voltage does not match the load power supply requirements. The power supply switching control circuit also includes a voltage matching unit. The voltage matching unit is a functional unit that realizes DC-DC conversion and is located between the first power interface and the switching execution unit. The output voltage of the voltage matching unit is set to a value that matches the load operating voltage range.

[0014] This application also provides a dual-circuit power supply control method for a battery-powered product, consisting of a built-in battery and an external power supply, as follows: In the initialization state, select either the first power interface or the second power interface to connect to the load interface; In the data acquisition state, the voltage of the first power interface is acquired as the first voltage, and the voltage of the second power interface is acquired as the second voltage. Determine the execution state. When the first power interface supplies power to the load interface, if the first voltage is lower than the first preset voltage and the second voltage is higher than the second preset voltage, select the second power interface to conduct to the load interface, and then return to the acquisition state. The system determines the execution state. If it is not the state where the first power interface supplies power to the load interface, i.e., the state where the second power interface supplies power to the load interface, and the first voltage is higher than the third preset voltage, the system selects the first power interface to conduct to the load interface, and then returns to the acquisition state.

[0015] Furthermore, the thin flexible conductive component is implemented using a flexible printed circuit (FPC) or a flexible die-cutting circuit (FDC).

[0016] Furthermore, the thin, flexible conductive component is implemented using a flexible flat cable (FFC).

[0017] Furthermore, the negative electrode and the positive electrode are implemented using a flexible printed circuit (FPC) or a flexible die-cutting circuit (FDC). Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall system structure of the present invention; Figure 2 This is a schematic diagram of the overall structure of the present invention when connected to a battery-powered product; Figure 3 This is a schematic diagram of the structural connection of the battery compartment of the product when connecting a battery-powered product according to the present invention; Figure 4 This is a connection diagram and a corresponding equivalent principle diagram of the present invention when connecting a battery-powered product; Figure 5 This application provides a schematic diagram illustrating the principle of a positive and negative electrode coordinated switching mode. Figure 6 This is a schematic diagram illustrating the principle of a positive electrode switching mode provided in an embodiment of this application; Figure 7 This is a schematic diagram illustrating the principle of a negative electrode switching mode provided in an embodiment of this application; Figure 8This is a schematic diagram illustrating the principle of a positive and negative pole coordinated switching mode, including a detection unit and a processing control unit, provided in an embodiment of this application. Figure 9 This is a schematic diagram of the positive electrode switching mode principle, which includes a detection unit and a processing control unit, provided in an embodiment of this application. Figure 10 This is a schematic diagram of the negative electrode switching mode principle, which includes a detection unit and a processing control unit, provided in an embodiment of this application. Figure 11 This is a schematic diagram of a voltage matching unit provided in an embodiment of this application; Figure 12 This is a schematic diagram of a voltage matching unit, a detection unit, and a processing control unit provided in an embodiment of this application; Figure 13 This is a schematic diagram of a common negative DC-DC converter circuit, a detection unit, and a processing control unit provided in an embodiment of this application; Figure 14 This is a flowchart of a dual-circuit power supply control method for a battery-powered product, which includes a built-in battery and an external power supply, provided in an embodiment of this application.

[0019] Explanation of reference numerals in the attached diagram: 11. Negative electrode lead-out plate; 111. Negative electrode power supply surface; 112. Negative electrode insulating layer; 113. Negative electrode load surface; 12. Positive electrode lead-out plate; 121. Positive electrode power supply surface; 122. Positive electrode insulating layer; 123. Positive electrode load surface; 13. Thin flexible conductive component; 14. External power supply device; 21. Battery box portion of the battery-powered product; 211. Battery compartment of the battery-powered product; 212. Battery box cover of the battery-powered product; 22. Battery compartment power supply wiring of the battery-powered product; 221. Negative power supply wiring of the battery compartment of the battery-powered product; 222. Positive power supply wiring of the battery compartment of the battery-powered product; 23. Built-in battery pack of the battery-powered product; 231. Built-in battery 1 of the battery-powered product; 232. Built-in battery 2 of the battery-powered product; 233. Built-in battery pack of the battery-powered product. 3. Battery 234. Built-in battery 4 of battery-powered product; 24. Negative terminal connector of battery compartment of battery-powered product; 25. Positive terminal connector of battery compartment of battery-powered product; 26. Negative terminal of built-in battery pack of battery-powered product; 27. Positive terminal of built-in battery pack of battery-powered product; 31. External DC power supply; 32. Power supply switching control circuit; 51. Switching execution unit; 511. First positive branch; 512. Second positive branch; 513. First negative branch; 514. Second negative branch; 515. First positive switching device branch; 516. Second positive switching device branch; 517. First negative switching device branch; 518. Second negative switching device branch; 52. Detection unit; 53. Processing control unit; 54. Voltage matching unit; 55. Common negative DC-DC conversion circuit. Detailed Implementation

[0020] The embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, but should not be construed as limiting the present invention.

[0021] In this application, unless otherwise expressly specified and limited, the term "connection" shall be interpreted broadly. For example, "connection" may be a fixed connection, a detachable connection, or an integral part; it may be a direct connection or an indirect connection through an intermediate medium.

[0022] Please refer to Figure 1 and Figure 4 As shown, the present invention includes the negative electrode outlet plate 11, the positive electrode outlet plate 12, the external power supply device 14, the thin flexible conductive component 13, and the power supply switching control circuit 32. The negative electrode outlet plate 11 includes a double-sided conductive structure, namely a negative power supply surface 111 and a negative load surface 113, which is placed between the negative terminal and the negative load terminal of the battery pack inside the battery compartment of the battery-powered product to conduct electrical connection. The negative power supply surface is connected to the negative terminal of the battery pack inside the battery-powered product, and the negative load surface is connected to the negative terminal of the load in the battery-powered product. The positive electrode outlet plate 12 includes a double-sided conductive structure, namely a positive power supply surface 121 and a positive load surface 123, which is placed between the positive terminal and the positive load terminal of the battery pack inside the battery compartment of the battery-powered product to conduct electrical connection. The positive power supply surface is connected to the positive terminal of the battery pack inside the battery-powered product, and the positive load surface is connected to the positive terminal of the load in the battery-powered product. Please refer to [reference needed]. Figure 3 and Figure 4 As shown, the negative electrode 11 is placed between the negative terminal 26 of the built-in battery pack and the negative terminal connector 24 of the battery compartment of the battery-powered product. The negative power supply side 111 is connected to the negative terminal 26 of the built-in battery pack, and the negative load side 113 is connected to the negative terminal connector 24 of the battery compartment and then to the negative power supply connector 221 of the battery compartment, providing the negative power supply to the load in the battery-powered product. The positive electrode 12 is placed between the positive terminal 27 of the built-in battery pack and the positive terminal connector 25 of the battery compartment, and the positive power supply side 121 is connected to the positive terminal 27 of the built-in battery pack. The positive load side 123 is connected to the positive terminal connector 25 of the battery compartment and then to the positive power supply connector 222 of the battery compartment, providing the positive power supply to the load in the battery-powered product.

[0023] The external power supply device 14 includes an external DC power supply 31; the external DC power supply 31 provides external power supply support for the dual-circuit power supply system.

[0024] Please refer to Figure 3 and Figure 4 As shown, the thin, flexible conductive component 13 is used to pass through the gap between the battery compartment and the battery box cover of the battery-powered product, establishing an electrical connection and control relationship between the negative power supply surface 111, the negative load surface 113, the positive power supply surface 121, the positive load surface 123 and the external power supply device 14. Through this structural installation method, the connection and control relationship between the built-in battery pack 23, the external DC power supply 31 and the load in the battery-powered product is established. In this way, the power supply switching control circuit 32 can control the power supply switching of the two power sources to the load in the battery-powered product to complete the dual-circuit power supply control function.

[0025] Please refer to Figure 4 As shown, the power supply switching control circuit includes a first power interface P1 (P1+ and P1-), a second power interface P2 (P2+ and P2-), a load interface L (L+ and L-), and a switching execution unit 51. The first power interface P1 (P1+ and P1-) includes a first power negative terminal P1- and a first power positive terminal P1+. The second power interface P2 (P2+ and P2-) includes a second power negative terminal P2- and a second power positive terminal P2+. The load interface L (L+ and L-) includes a load negative terminal L- and a load positive terminal L+. The first power interface P1 (P1+ and P1-) is connected to an external DC power supply 31, that is, the first negative terminal P1- is connected to the negative terminal of the external DC power supply 31, and the first power positive terminal P1+ is connected to the positive terminal of the external DC power supply 31. The second power interface P2 (P2+ and P2-) is connected to the built-in battery pack of the battery-powered product, that is, the second power negative terminal P2- is connected to the negative terminal of the battery pack. The power supply side 111 is then connected to the negative terminal 26 of the built-in battery pack of the battery-powered product. The positive terminal P2+ of the second power supply is connected to the positive power supply side 121 and then to the positive terminal 27 of the built-in battery pack of the battery-powered product. The load interface L (L+ and L-) is connected to the load end of the battery-powered product. That is, the negative terminal L- of the load is connected to the negative load side 113 and then to the negative terminal of the load in the battery-powered product. The positive terminal L+ of the load is connected to the positive load side 123 and then to the positive terminal of the load in the battery-powered product. The switching execution unit 51 is connected to the first power interface P1 (P1+ and P1-), the second power interface P2 (P2+ and P2-) and the load interface L (L+ and L-). It is used to selectively conduct and isolate at least one of the positive and negative paths, so as to selectively conduct the first power interface P1 (P1+ and P1-) or the second power interface P2 (P2+ and P2-) to the load interface L (L+ and L-).

[0026] In one implementation, a schematic diagram of the principle is shown below. Figure 5As shown, the switching execution unit includes a first positive branch 511, a second positive branch 512, a first negative branch 513, and a second negative branch 514. The first positive branch 511 is located between the first power supply positive terminal P1+ and the load positive terminal L-. The second positive branch 512 is located between the second power supply positive terminal P2+ and the load positive terminal L+. The first negative branch 513 is located between the first power supply negative terminal P1- and the load negative terminal L-. The second negative branch 514 is located between the second power supply negative terminal P2- and the load negative terminal L-. Between extreme L-; when the first power interface P1 (P1+ and P1-) is connected to the load interface L (L+ and L-), the first positive branch 511 and the first negative branch 513 are connected, and at least one of the second positive branch 512 and the second negative branch 514 is disconnected; when the second power interface P2 (P2+ and P2-) is connected to the load interface L (L+ and L-), the second positive branch 512 and the second negative branch 514 are connected, and at least one of the first positive branch 511 and the first negative branch 513 is disconnected. When necessary, at least one of the first positive branch 511 and the first negative branch 513, and at least one of the second positive branch 512 and the second negative branch 514 can be disconnected, thus de-energizing the load interface.

[0027] In one implementation, a schematic diagram of the principle is shown below. Figure 6 As shown, the switching execution unit 51 includes a first positive branch 511 and a second positive branch 512; the first power supply negative terminal P1-, the second power supply negative terminal P2-, and the load negative terminal L- are connected to a common negative terminal node. The first positive branch 511 is located between the first power supply positive terminal P1+ and the load positive terminal L+, and the second positive branch 512 is located between the second power supply positive terminal P2+ and the load positive terminal L+. When the first power interface P1 (P1+ and P1-) is selected to be connected to the load interface, the first positive branch 511 is turned on and the second positive branch 512 is turned off; when the second power interface P2 (P2+ and P2-) is selected to be connected to the load interface L (L+ and L-), the second positive branch 512 is turned on and the first positive branch 511 is turned off. When needed, the first positive branch 511 and the second positive branch 512 are turned off, and the load interface L (L+ and L-) is de-energized. The second power supply negative terminal P2- and the load negative terminal L- need to be connected together, that is, the negative power supply surface 111 and the negative load surface 113 of the negative electrode output plate 11 need to be electrically connected. The electrical connection can be established by a conductor line, or the negative electrode output plate 11 can be made into a whole conductor to achieve the electrical connection.

[0028] In one implementation, a schematic diagram of the principle is shown below. Figure 7 As shown, the switching execution unit includes a first negative branch 513 and a second negative branch 514; the first power supply positive terminal P1+, the second power supply positive terminal P2+, and the load positive terminal L+ are connected to a common positive node; the first negative branch 513 is located between the first power supply negative terminal P1- and the load negative terminal L-; the second negative branch 514 is located between the second power supply negative terminal P2- and the load negative terminal L-; when the first power interface P1 (P1+ and P1-) is selected to be connected to the load interface L (L+ and L-), the first negative branch 513 is turned on and the second negative branch 514 is turned off; when the second power interface P2 (P2+ and P2-) is selected to be connected to the load interface L (L+ and L-), the second negative branch 514 is turned on and the first negative branch 513 is turned off. When necessary, the first negative branch 513 and the second negative branch 514 are shut off, and the load interface L (L+ and L-) is de-energized. The second power supply positive terminal P2+ and the load positive terminal L+ need to be connected together, that is, the positive power supply surface 121 and the positive load surface 123 of the positive electrode 12 need to be electrically connected. This electrical connection can be established through a conductor line, or the positive electrode 12 can be made into a single conductor to achieve the electrical connection.

[0029] Furthermore, the first positive switch branch 511, the second positive switch branch 512, the first negative switch branch 513, and the second negative switch branch 514 are implemented using one or a combination of diodes, ideal diodes, and switching devices.

[0030] In one implementation, a schematic diagram of the principle is shown below. Figure 8As shown, the power supply switching control circuit 32 further includes a detection unit 52 and a processing control unit 53. The switching execution unit 51 includes a first positive switching device branch 515, a second positive switching device branch 516, a first negative switching device branch 517, and a second negative switching device branch 518. The first positive switching device branch 515 is located between the first power supply positive terminal P1+ and the load positive terminal L+. The second positive switching device branch 516 is located between the second power supply positive terminal P2+ and the load positive terminal L+. The first negative switching device branch 517 is located between the first power supply negative terminal P1- and the load negative terminal L-. The second negative switching device branch 518 is located between the second power supply negative terminal P2- and the load negative terminal L-. The detection unit 52 is connected to the first power interface P1 (P1+ and P1-), the second power interface P2 (P2+ and P2-), and the processing control unit 53. The processing control unit 53 is connected to the detection unit 52, the first positive switching device branch 515, the second positive switching device branch 516, the first negative switching device branch 517, and the second negative switching device branch 518. The detection unit 52 detects voltage parameters of the first power interface P1 (P1+ and P1-) and the second power interface P2 (P2+ and P2-). The processing control unit 53 outputs a control signal based on the voltage parameters. The switching execution unit 51 selectively connects the first power interface P1 (P1+ and P1-) or the second power interface P2 (P2+ and P2-) to the load interface L (L+ and L-) based on the control signal. When the first power interface P1 (P1+ and P1-) is connected to the load interface L (L+ and L-), the first positive switching device branch 515 and the first negative switching device branch 517 are connected. At least one of the second positive switching device branch 516 and the second negative switching device branch 518 is turned off; when the second power interface P2 (P2+ and P2-) is selected to be connected to the load interface L (L+ and L-), the second positive switching device branch 516 and the second negative switching device branch 518 are turned on, and at least one of the first positive switching device branch 515 and the first negative switching device branch 517 is turned off. When necessary, at least one of the first positive switching device branch 515 and the first negative switching device branch 517 can be turned off, and at least one of the second positive switching device branch 516 and the second negative switching device branch 518 can be turned off, and the load interface L (L+ and L-) is de-energized.

[0031] In one implementation, a schematic diagram of the principle is shown below. Figure 9As shown, the power supply switching control circuit 32 further includes a detection unit 52 and a processing control unit 53. The switching execution unit 51 includes a first positive switching device branch 515 and a second positive switching device branch 516. The first power supply negative terminal P1-, the second power supply negative terminal P2-, and the load negative terminal L- are connected to a common negative terminal node. The first positive switching device branch 515 is located between the first power supply positive terminal P1+ and the load positive terminal L+. The second positive switching device branch 516 is located between the second power supply positive terminal P2+ and the load positive terminal L+. The detection unit 52 is connected to the first power interface P1 (P1+ and P1-), the second power interface P2 (P2+ and P2-), and the processing control unit 53. The processing control unit 53 is connected to the detection unit 52, the first positive switching device branch 515, and the second positive switching device branch 516. The connection is as follows: the detection unit 52 detects the voltage parameters of the first power interface P1 (P1+ and P1-) and the second power interface P2 (P2+ and P2-); the processing control unit 53 outputs a control signal according to the voltage parameters; and the switching execution unit 51 selectively connects the first power interface P1 (P1+ and P1-) or the second power interface P2 (P2+ and P2-) to the load interface L (L+ and L-) according to the control signal. When the first power interface P1 (P1+ and P1-) is connected to the load interface L (L+ and L-), the first positive switching device branch 515 is turned on and the second positive switching device branch 516 is turned off. When the second power interface P2 (P2+ and P2-) is connected to the load interface L (L+ and L-), the second positive switching device branch 516 is turned on and the first positive switching device branch 515 is turned off. When necessary, the first positive switching device branch 515 and the second positive switching device branch 516 are shut off, and the load interface L (L+ and L-) is de-energized. The second power supply negative terminal P2- and the load negative terminal L- are connected together, that is, the negative power supply surface 111 and the negative load surface 113 of the negative electrode 11 need to be electrically connected. This electrical connection can be established through a conductor line, or the negative electrode 11 can be made into a single conductor to achieve the electrical connection.

[0032] In one implementation, a schematic diagram of the principle is shown below. Figure 10As shown, the power supply switching control circuit 32 further includes a detection unit 52 and a processing control unit 53. The switching execution unit 51 includes a first negative switching device branch 517 and a second negative switching device branch 518. The first power supply positive terminal P1+, the second power supply positive terminal P2+, and the load positive terminal L+ are connected to a common positive terminal node. The first negative switching device branch 517 is located between the first power supply negative terminal P1- and the load negative terminal L-. The second negative switching device branch 518 is located between the second power supply negative terminal P2- and the load negative terminal L-. The detection unit 52 is connected to the first power interface P1 (P1+ and P1-), the second power interface P2 (P2+ and P2-), and the processing control unit 53. The processing control unit 53 is connected to the detection unit 52, the first negative switching device branch 517, and the second negative switching device branch 518. The detection unit 52 detects the voltage parameters of the first power interface P1 (P1+ and P1-) and the second power interface P2 (P2+ and P2-). The processing control unit 53 outputs a control signal based on the voltage parameters. The switching execution unit 51 selectively connects the first power interface P1 (P1+ and P1-) or the second power interface P2 (P2+ and P2-) to the load interface L (L+ and L-) based on the control signal. When the first power interface P1 (P1+ and P1-) is connected to the load interface L (L+ and L-), the first negative switching device branch 517 is turned on and the second negative switching device branch 518 is turned off. When the second power interface P2 (P2+ and P2-) is connected to the load interface L (L+ and L-), the second negative switching device branch 518 is turned on and the first negative switching device branch 517 is turned off. When necessary, the first negative switch branch 517 and the second negative switch branch 518 are shut off, and the load interface L (L+ and L-) is de-energized. The second power supply positive terminal P2+ and the load positive terminal L+ are connected together, meaning that the positive power supply surface 121 and the positive load surface 123 of the positive electrode 12 need to be electrically connected. This electrical connection can be established through a conductor line, or the positive electrode 12 can be made into a single conductor to achieve the electrical connection.

[0033] Furthermore, the switching devices in the first positive switching device branch 515, the second positive switching device branch 516, the first negative switching device branch 517, and the second negative switching device branch 518 include one or more of field-effect transistors, relays, and bipolar transistors.

[0034] In various implementations, there may be situations where the DC power supply voltage does not match the load's power supply requirements. In such cases, a voltage matching unit needs to be added. See the schematic diagram for reference. Figure 11 and Figure 12 As shown. The voltage matching unit 54 is a functional unit for realizing DC-DC conversion, and is located between the first power interface P1 (P1+ and P1-) and the switching execution unit 51. The output of the voltage matching unit is set to a value that matches the operating voltage range of the load.

[0035] Furthermore, when the voltage matching unit employs a common-negative DC-DC converter circuit with an enable function, the circuit schematic diagram is as follows: Figure 13 As shown, the DC-DC converter chip used in the common negative DC-DC converter circuit 55 generally contains a corresponding switching transistor and a function module to prevent reverse current flow. The DC-DC converter chip controls the corresponding switching transistor inside the chip through an enable switch. In this way, the processing and control unit 53 controls the second positive switching device branch 516 and the enable switch of the common negative DC-DC converter chip (further controlled by the first positive switching device branch 517 built into the DC-DC converter chip) to selectively turn on the first power interface P1 (P1+ and P1-) or the second power interface P2 (P2+ and P2-) to the load interface L (L+ and L-).

[0036] A dual-circuit power supply control method for a battery-powered product, consisting of a built-in battery and an external power source, is described, including the power supply switching control circuit's control state and related switching process, as shown in the flowchart below. Figure 14 As shown, the following states and processes are included: S01: Initialization state, select the first power interface P1 (P1+ and P1-) or the second power interface P2 (P2+ and P2-) to be connected to the load interface L (L+ and L-); S02: Data acquisition state, the voltage of the first power interface P1 (P1+ and P1-) is acquired as the first voltage, and the voltage of the second power interface P2 (P2+ and P2-) is acquired as the second voltage; S03, S04: Determine the execution state. When the first power interface P1 (P1+ and P1-) supplies power to the load interface, the first voltage is lower than the first preset voltage, and the second voltage is higher than the second preset voltage. Select the second power interface P2 (P2+ and P2-) to conduct to the load interface L (L+ and L-), and then return to the acquisition state S02. S03, S05: Determine the execution state. If it is not the state where the first power interface P1 (P1+ and P1-) supplies power to the load interface, that is, the state where the second power interface P2 (P2+ and P2-) supplies power to the load interface, and the first voltage is higher than the third preset voltage, select the first power interface P1 (P1+ and P1-) to conduct to the load interface L (L+ and L-), and then return to the acquisition state S02.

[0037] In actual implementation, voltage acquisition typically includes a filtering algorithm to filter out fluctuations in the acquired voltage. A first preset voltage is compared with a first preset voltage when the first power interface P1 (P1+ and P1-) disconnects the load interface L (L+ and L-). A third preset voltage is compared with a third preset voltage when the first power interface P1 (P1+ and P1-) supplies power to the load interface L (L+ and L-). Generally, the third preset voltage is greater than or equal to the first preset voltage; this is a clear characteristic of the power supply recovery at the first power interface P1 (P1+ and P1-).

[0038] Furthermore, the thin flexible conductive component 13 needs to have conductive lines, flexible features, and be able to pass through the gap between the battery compartment and the battery box cover. The thin flexible conductive component 13 uses a flexible printed circuit board (FPC) or a flexible die-cutting circuit (FDC). The flexible printed circuit board (FPC) or flexible die-cutting circuit (FDC) has a flexible structure that allows conductive materials to be laid on the structure. Commonly used ones can achieve a thickness of 0.1 mm, which fully meets the requirements of the thin flexible conductive component 13.

[0039] Furthermore, the thin flexible conductive component 13 needs to be conductive, flexible, and able to pass through the gap between the battery compartment and the battery box cover. The thin flexible conductive component 13 uses a flexible flat cable (FFC). Flexible flat cable (FFC) has a flexible structure and can lay conductive material on the structure. Commonly used ones can achieve a thickness of 0.1 mm, which fully meets the requirements of the thin flexible conductive component 13.

[0040] Furthermore, the negative electrode 11 and the positive electrode 12 are characterized by being composed of a double-sided conductive layer and an intermediate insulating layer. The top and bottom layers of the flexible printed circuit board (FPC) or flexible die-cutting circuit (FDC) are made as surface conductive layers, which serve as the negative power supply surface 111 and negative load surface 113, and the positive power supply surface 121 and positive load surface 123, respectively. An insulating layer exists between the top and bottom layers, satisfying the structural requirements of the negative and positive electrode 11 and the positive electrode 12. This implementation allows the negative electrode 11, the positive electrode 12, and the thin flexible conductive component 13 to be made of the same material, reducing structural complexity and cost.

[0041] The key point of this invention is that the negative power supply and negative load of the battery pack of the battery-powered product are electrically connected through the negative electrode 11, and the positive power supply and positive load of the battery pack of the battery-powered product are electrically connected through the positive electrode 12. The exported negative power supply, negative load, positive power supply and positive load are connected to the thin flexible conductive component 13. Then, the thin flexible conductive component 13 passes through the gap between the battery compartment and the battery box cover of the battery-powered product to establish the exported electrical control and connection relationship between the internal power supply terminal and the internal load terminal of the battery-powered product and the external power supply device. In this way, the power supply switching control circuit 32 can control the conduction circuit to preferentially select the external power supply device 14 to supply power to the load in the battery-powered product, and assist in selecting the built-in battery pack 23 of the battery-powered product to supply power to the load in the battery-powered product.

[0042] The thin, flexible conductive component 13 can easily pass through the gap between the battery compartment 221 and the battery box cover 212 of the battery-powered product, and it can also be easily deformed and folded during installation for user convenience.

[0043] The power supply switching control circuit 32 is a circuit that works in conjunction with materials, structure, and installation method to achieve the entire function. The implementation methods include, but are not limited to, circuits that are set separately in the external power supply device 14, circuits set in the external power supply device 14 and circuits set on the thin flexible conductive component 13 working together, and circuits that are set separately on the thin flexible conductive component 13.

[0044] The external DC power supply 31 refers to a power supply with power supply capability, including but not limited to DC power after passing through a power conversion module, DC power input through an interface, DC power provided by power generation equipment and components, and DC power provided by energy storage equipment and components. DC power provided by energy storage equipment and components includes power provided by lithium batteries, lithium battery packs, etc.

[0045] When the external DC power supply 31 provides DC power to the energy storage device and components, including power from lithium batteries, lithium battery packs, etc., the detection unit and control switching unit of the present invention detect the battery voltage by detecting the approximate charge value corresponding to the battery voltage, and determine whether to switch the power supply to the load in the battery-powered device based on the approximate charge value.

[0046] The detection unit in this invention is often implemented using an ADC, and the control switching unit is generally implemented using an MCU. Commonly used MCUs on the market usually have built-in ADCs, so the detection unit and the control switching unit are often implemented using MCUs that include ADCs.

[0047] This invention can also enable an external power supply device to supply power to the load in the battery-powered device when the built-in battery of the battery-powered device is in a state of no voltage, such as when a model battery of the same size as the original battery is installed or a battery that is completely depleted.

[0048] The system structure and technical principles of the present invention have been described above with reference to specific embodiments. Since the dual-circuit power supply switching control circuit can take many forms, the embodiments illustrate the main implementation forms. Different control methods can be mixed through positive and negative control branches, but these are not described in the embodiments. Therefore, these descriptions are only for explaining the system and principles of the present invention and should not be construed as limiting the scope of protection of the present invention in any way. Based on this explanation, those skilled in the art can conceive of other specific embodiments of the present invention without creative effort, and these embodiments will all fall within the scope of protection of the present invention.

Claims

1. A dual-circuit power supply system for a battery-powered product, consisting of a built-in battery and an external power source, characterized in that: include: Negative electrode lead-out electrode, positive electrode lead-out electrode, external power supply equipment, thin flexible conductive component and power supply switching control circuit; The negative electrode output electrode includes a double-surface conductor structure, namely a negative electrode power supply surface and a negative electrode load surface, which is placed between the negative electrode and the negative electrode load end of the battery pack inside the battery compartment of the battery-powered product to conduct electrical connection; the negative electrode power supply surface is connected to the negative electrode of the battery pack inside the battery-powered product, and the negative electrode load surface is connected to the negative load electrode in the battery-powered product; The positive electrode leads out plate includes a double-surface conductor structure, namely a positive power supply surface and a positive load surface, which is placed between the positive terminal and the positive load terminal of the built-in battery pack in the battery compartment of the battery-powered product to conduct electrical connection; the positive power supply surface is connected to the positive terminal of the built-in battery pack in the battery-powered product, and the positive load surface is connected to the positive load terminal in the battery-powered product; The external power supply device includes an external DC power supply; The thin, flexible conductive component is used to pass through the gap between the battery compartment and the battery box cover of the battery-powered product to establish the electrical connection and control relationship between the negative power supply surface, the negative load surface, the positive power supply surface, the positive load surface and the external power supply device. The power supply switching control circuit includes a first power interface, a second power interface, a load interface, and a switching execution unit; the first power interface includes a first power negative terminal and a first power positive terminal; the second power interface includes a second power negative terminal and a second power positive terminal; the load interface includes a load negative terminal and a load positive terminal. The first power interface connects to an external DC power supply, i.e., the first negative terminal is connected to the negative terminal of the external DC power supply, and the first positive terminal is connected to the positive terminal of the external DC power supply; the second power interface connects to the built-in battery pack of the battery-powered product, i.e., the second negative terminal is connected to the negative power supply side and then to the negative terminal of the built-in battery pack of the battery-powered product, and the second positive terminal is connected to the positive power supply side and then to the positive terminal of the built-in battery pack of the battery-powered product; the load interface connects to the load end of the battery-powered product, i.e., the load negative terminal is connected to the negative load side and then to the negative terminal of the load in the battery-powered product, and the load positive terminal is connected to the positive load side and then to the positive terminal of the load in the battery-powered product; The switching execution unit is connected to the first power interface, the second power interface and the load interface, and is used to selectively conduct and isolate at least one of the positive path and the negative path, so as to selectively conduct the first power interface or the second power interface to the load interface.

2. The dual-circuit power supply system according to claim 1, characterized in that, The switching execution unit includes a first positive branch, a second positive branch, a first negative branch, and a second negative branch. The first positive branch is located between the positive terminal of the first power supply and the positive terminal of the load. The second positive branch is located between the positive terminal of the second power supply and the positive terminal of the load. The first negative branch is located between the negative terminal of the first power supply and the negative terminal of the load. When the first power interface is selected to be connected to the load interface, the first positive branch and the first negative branch are connected, and at least one of the second positive branch and the second negative branch is disconnected. When the second power interface is selected to be connected to the load interface, the second positive branch and the second negative branch are connected, and at least one of the first positive branch and the first negative branch is disconnected.

3. The dual-circuit power supply system according to claim 1, characterized in that, The switching execution unit includes a first positive branch and a second positive branch; the first power supply negative terminal, the second power supply negative terminal, and the load negative terminal are connected to a common negative terminal node; the first positive branch is located between the first power supply positive terminal and the load positive terminal; the second positive branch is located between the second power supply positive terminal and the load positive terminal; when the first power interface is selected to be connected to the load interface, the first positive branch is connected and the second positive branch is disconnected; when the second power interface is selected to be connected to the load interface, the second positive branch is connected and the first positive branch is disconnected.

4. The dual-circuit power supply system according to claim 1, characterized in that, The switching execution unit includes a first negative branch and a second negative branch; the first power supply positive terminal, the second power supply positive terminal, and the load positive terminal are connected to a common positive node; the first negative branch is located between the first power supply negative terminal and the load negative terminal; the second negative branch is located between the second power supply negative terminal and the load negative terminal; when the first power interface is selected to be connected to the load interface, the first negative branch is connected and the second negative branch is disconnected; when the second power interface is selected to be connected to the load interface, the second negative branch is connected and the first negative branch is disconnected.

5. The dual-circuit power supply system according to any one of claims 2 to 4, characterized in that, The first positive branch, the second switching branch, the first negative branch, and the second negative branch are implemented using one or a combination of diodes, ideal diodes, and switching devices.

6. The dual-circuit power supply system according to claim 1, characterized in that, The power supply switching control circuit further includes a detection unit and a processing control unit. The switching execution unit includes a first positive switching device branch, a second positive switching device branch, a first negative switching device branch, and a second negative switching device branch. The first positive switching device branch is disposed between the positive terminal of the first power supply and the positive terminal of the load. The second positive switching device branch is disposed between the positive terminal of the second power supply and the positive terminal of the load. The first negative switching device branch is disposed between the negative terminal of the first power supply and the negative terminal of the load. The second negative switching device branch is disposed between the negative terminal of the second power supply and the negative terminal of the load. The detection unit is connected to the first power interface, the second power interface, and the processing control unit. The processing control unit is connected to the detection unit, the first positive switching device branch, the second positive switching device branch, the first negative switching device branch, and the second negative switching device branch. The detection unit detects voltage parameters of the first power interface and the second power interface. The processing control unit outputs a control signal based on the voltage parameters. The switching execution unit selectively switches the first power interface or the second power interface to the load interface based on the control signal. When the first power interface is selected to be connected to the load interface, the first positive switching device branch and the first negative switching device branch are connected, and at least one of the second positive switching device branch and the second negative switching device branch is turned off; when the second power interface is selected to be connected to the load interface, the second positive switching device branch and the second negative switching device branch are connected, and at least one of the first positive switching device branch and the first negative switching device branch is turned off.

7. The dual-circuit power supply system according to claim 1, characterized in that, The power supply switching control circuit further includes a detection unit and a processing control unit. The switching execution unit includes a first positive switching device branch and a second positive switching device branch. The first power supply negative terminal, the second power supply negative terminal, and the load negative terminal are connected to a common negative terminal node. The first positive switching device branch is located between the first power supply positive terminal and the load positive terminal, and the second positive switching device branch is located between the second power supply positive terminal and the load positive terminal. The detection unit is connected to the first power interface, the second power interface, and the processing control unit. The processing control unit is connected to the detection unit and the first positive switching device. The first power interface and the second power interface are connected; the detection unit detects the voltage parameters of the first power interface and the second power interface; the processing control unit outputs a control signal according to the voltage parameters; the switching execution unit selectively connects the first power interface or the second power interface to the load interface according to the control signal; when the first power interface is connected to the load interface, the first positive switching device branch is connected and the second positive switching device branch is turned off; when the second power interface is connected to the load interface, the second positive switching device branch is connected and the first positive switching device branch is turned off.

8. The dual-circuit power supply system according to claim 1, characterized in that, The power supply switching control circuit further includes a detection unit and a processing control unit. The switching execution unit includes a first negative switching device branch and a second negative switching device branch. The first power supply positive terminal, the second power supply positive terminal, and the load positive terminal are connected to a common positive terminal node. The first negative switching device branch is located between the first power supply negative terminal and the load negative terminal, and the second negative switching device branch is located between the second power supply negative terminal and the load negative terminal. The detection unit is connected to the first power interface, the second power interface, and the processing control unit. The processing control unit is connected to the detection unit and the first negative switching device. The branch circuit and the second negative switch device branch circuit are connected; the detection unit detects the voltage parameters of the first power interface and the second power interface; the processing control unit outputs a control signal according to the voltage parameters; the switching execution unit selectively connects the first power interface or the second power interface to the load interface according to the control signal; when the first power interface is connected to the load interface, the first negative switch device branch circuit is connected and the second negative switch device branch circuit is turned off; when the second power interface is connected to the load interface, the second negative switch device branch circuit is connected and the first negative switch device branch circuit is turned off.

9. The dual-circuit power supply system according to any one of claims 6 to 8, characterized in that, The switching devices in the first positive switching device branch, the second positive switching device branch, the first negative switching device branch, and the second negative switching device branch include one or more of field-effect transistors, relays, and bipolar transistors.

10. The dual-circuit power supply system according to claims 1 to 9, characterized in that, It also includes a voltage matching unit, which is a functional unit for realizing DC-DC conversion. It is located between the first power interface and the switching execution unit, and the output voltage of the voltage matching unit is set to a value that matches the operating voltage range of the load.

11. A dual-circuit power supply control method for a battery-powered product, consisting of a built-in battery and an external power source, applied to the dual-circuit power supply system described in any one of claims 6 to 9, characterized in that... The power supply switching control circuit includes the following control methods: In the initialization state, select either the first power interface or the second power interface to connect to the load interface; In the data acquisition state, the voltage of the first power interface is acquired as the first voltage, and the voltage of the second power interface is acquired as the second voltage. Determine the execution state. When the first power interface supplies power to the load interface, if the first voltage is lower than the first preset voltage and the second voltage is higher than the second preset voltage, select the second power interface to conduct to the load interface, and then return to the acquisition state. The system determines the execution state. If it is not the state where the first power interface supplies power to the load interface, i.e., the state where the second power interface supplies power to the load interface, and the first voltage is higher than the third preset voltage, the system selects the first power interface to conduct to the load interface, and then returns to the acquisition state.

12. The dual-circuit power supply system as described in claim 1, wherein the thin flexible conductive component is implemented using a flexible printed circuit (FPC) or a flexible die-cutting circuit (FDC).

13. The external power supply system of the battery-powered product as described in claim 1, wherein the thin flexible conductive component is implemented using a flexible flat cable (FFC).

14. The dual-circuit power supply system as described in claim 1, wherein the negative electrode and the positive electrode are implemented using a flexible printed circuit (FPC) or a flexible die-cutting circuit (FDC).

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