Charging and discharging circuit and power supply equipment

Abstract

The utility model relates to a charging and discharging circuit and power supply equipment, the charging and discharging circuit comprises a port circuit, a direct current-direct current conversion circuit, a bidirectional charge pump circuit and a control assembly, the port circuit, the direct current-direct current conversion circuit and the bidirectional charge pump circuit are respectively connected with the control assembly, and the low-voltage end of the bidirectional charge pump circuit is directly connected with a battery. The high-voltage end of the bidirectional charge pump circuit is connected with the port circuit through the DC-DC conversion circuit, and the port circuit can be connected to charging equipment or an electric load according to actual demands. When the port circuit is connected to a charging device, electric energy output by the charging device is subjected to direct current conversion through the direct current-direct current conversion circuit, is subjected to voltage reduction through the bidirectional charge pump circuit and is transmitted to the battery to charge the battery. And when the port circuit is connected to an electric load, the electric energy output by the battery is boosted by the bidirectional charge pump circuit, and then passes through the direct current-direct current conversion circuit and the port circuit in sequence at relatively high voltage to supply power to the electric load.

Description

Technical Field

[0001] This application relates to the field of power supply technology, and in particular to a charging and discharging circuit and a power supply device. Background Technology

[0002] With the rapid development of science and technology, electronic products are becoming increasingly widely used in daily life. These products typically use rechargeable batteries such as lithium batteries, which frequently need to be recharged to maintain their battery life. To meet people's need for charging anytime, anywhere, portable power banks and other power supply devices have emerged.

[0003] Currently, the common full-charge voltage of lithium-ion batteries is 4.2V (volts), and the discharge cut-off voltage is 3V. When using a single cell to supply power at 3V-4.2V, the maximum output power is about 18W (watts). To output higher power, more cells often need to be connected in series. Summary of the Invention

[0004] Therefore, it is necessary to provide a charging and discharging circuit and power supply device to solve the problem that current power supply devices cannot achieve high power supply with a low number of battery cells.

[0005] In a first aspect, this application provides a charging and discharging circuit, including a port circuit, a DC-DC converter circuit, a bidirectional charge pump circuit, and a control component. The port circuit is used to connect to a charging device or an electrical load. The DC-DC converter circuit is connected to the port circuit. The high-voltage terminal of the bidirectional charge pump circuit is connected to the DC-DC converter circuit, and the low-voltage terminal of the bidirectional charge pump circuit is used to connect to a battery. The bidirectional charge pump circuit is used to step down the electrical energy output by the DC-DC converter circuit and transmit it to the battery when the port circuit is connected to a charging device, and to step up the electrical energy output by the battery and transmit it to the DC-DC converter circuit when the port circuit is connected to an electrical load. The port circuit, the DC-DC converter circuit, and the bidirectional charge pump circuit are respectively connected to the control component.

[0006] Secondly, this application also provides a power supply device, including a battery and the aforementioned charging and discharging circuit.

[0007] The aforementioned charging and discharging circuit and power supply equipment include a port circuit, a DC-DC converter circuit, a bidirectional charge pump circuit, and a control component. The port circuit, DC-DC converter circuit, and bidirectional charge pump circuit are respectively connected to the control component. The low-voltage end of the bidirectional charge pump circuit is directly connected to the battery, while the high-voltage end of the bidirectional charge pump circuit is connected to the port circuit via the DC-DC converter circuit. The port circuit can be connected to a charging device or an electrical load as needed. When the port circuit is connected to a charging device, the power output from the charging device undergoes DC-DC conversion via the DC-DC converter circuit, is then stepped down by the bidirectional charge pump circuit, and transmitted to the battery to charge it. When the port circuit is connected to an electrical load, the power output from the battery is boosted by the bidirectional charge pump circuit and then passes through the DC-DC converter circuit and the port circuit at a higher voltage to power the electrical load. This scheme allows the battery's power to be boosted before supplying it to the electrical load, providing a higher output power. Even with a small number of batteries, a higher output power can be achieved, solving the current problem of power supply equipment being unable to achieve high power supply with a relatively small number of battery cells. Attached Figure Description

[0008] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0009] Figure 1 This is a schematic diagram of the charging and discharging circuit structure in one embodiment of this application;

[0010] Figure 2 This is a schematic diagram of the charge / discharge circuit structure in another embodiment of this application;

[0011] Figure 3 This is a schematic diagram of the protocol identification circuit and DC-DC converter circuit in one embodiment of this application;

[0012] Figure 4 This is a schematic diagram of the charge / discharge circuit structure in another embodiment of this application;

[0013] Figure 5 This is a schematic diagram of the control component structure in one embodiment of this application;

[0014] Figure 6 This is a schematic diagram of a bidirectional charge pump circuit structure in one embodiment of this application.

[0015] Explanation of reference numerals in the attached figures:

[0016] 10 - Port circuit, 20 - DC-DC converter circuit, 30 - Bidirectional charge pump circuit, 40 - Control components, 11 - Connection port, 12 - Protocol identification circuit, 41 - Protocol processor, 42 - Controller. Detailed Implementation

[0017] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.

[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0019] It is understood that the terms "first," "second," etc., used herein may be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another. For example, without departing from the scope of this application, a first resistor may be referred to as a second resistor, and similarly, a second resistor may be referred to as a first resistor. Both the first resistor and the second resistor are resistors, but they are not the same resistor.

[0020] It is understood that the term "connection" in the following embodiments should be understood as "electrical connection," "communication connection," etc., if the connected circuits, modules, units, etc., have electrical signal or data transmission with each other.

[0021] It is understandable that "at least one" refers to one or more, and "multiple" refers to two or more. "At least a part of an element" refers to part or all of an element.

[0022] When used herein, the singular forms of “a,” “an,” and “the” may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising / including” or “having,” etc., specify the presence of the stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof. Meanwhile, the term “and / or” as used in this specification includes any and all combinations of the associated listed items.

[0023] The charging and discharging circuit provided in this application embodiment is applied to various electronic products that can be charged and discharged. Specifically, it is applied to electronic products with high power output requirements. In this application embodiment, power higher than the maximum output power of the battery is understood as high power. The battery can be a single cell or a battery string formed by connecting multiple cells, depending on the requirements.

[0024] Specifically, the types of these electronic products are not limited; they can be power devices, such as portable energy storage devices or power banks; or they can be terminal devices such as mobile phones with reverse charging capabilities. For ease of understanding of the technical solutions of this application, the charging and discharging circuits in the following embodiments can all be understood as being applied to portable power banks.

[0025] Please see Figure 1 This application provides a charging and discharging circuit, including a port circuit 10, a DC-DC converter circuit 20, a bidirectional charge pump circuit 30, and a control component 40. The port circuit 10 is used to connect to a charging device or an electrical load. The DC-DC converter circuit 20 is connected to the port circuit 10. The high-voltage terminal of the bidirectional charge pump circuit 30 is connected to the DC-DC converter circuit 20, and the low-voltage terminal of the bidirectional charge pump circuit 30 is used to connect to a battery. The bidirectional charge pump circuit 30 is used to step down the electrical energy output from the DC-DC converter circuit 20 and transmit it to the battery when the port circuit 10 is connected to a charging device, and to step up the electrical energy output from the battery and transmit it to the DC-DC converter circuit 20 when the port circuit 10 is connected to an electrical load. The port circuit 10, the DC-DC converter circuit 20, and the bidirectional charge pump circuit 30 are respectively connected to the control component 40.

[0026] Specifically, the charge / discharge circuit refers to a circuit that can both charge the battery according to the connected charging device and release the battery's electrical energy to the connected electrical load. Port circuit 10 is used to connect charging devices or electrical loads, and to identify and transmit electrical energy to the connected charging devices or loads. DC-DC converter circuit 20, also known as a DCDC (Direct Current to Direct Current Converter) circuit, is a circuit that converts DC voltage to DC voltage output.

[0027] The bidirectional charge pump circuit 30 is a charge pump circuit capable of bidirectional power transfer. Specifically, during forward power transfer, a lower voltage is input to the low-voltage side of the bidirectional charge pump circuit 30, and after conversion, it is output as a higher voltage (a certain multiple) from the high-voltage side. During reverse power transfer, a higher voltage is input to the high-voltage side of the charge pump circuit, and after conversion, it is reduced to a lower voltage (a certain multiple) from the low-voltage side. The charge pump circuit, also known as a switched-capacitor voltage converter circuit, is a converter circuit that uses the charging and discharging process of a capacitor to transfer and convert charge, thereby increasing or decreasing the voltage.

[0028] In practical scenarios, disregarding the losses of the bidirectional charge pump circuit 30, when performing voltage boosting or deboosting, it typically increases or decreases the voltage by a certain factor. The output voltage at this point usually does not meet the charging requirements of the battery or the voltage requirements of the electrical load. Therefore, a DC-DC converter circuit 20 is needed between the bidirectional charge pump circuit 30 and the port circuit 10 to convert the input or output electrical energy into voltage to meet practical needs.

[0029] In this embodiment, the port circuit 10, the DC-DC converter circuit 20, and the bidirectional charge pump circuit 30 are respectively connected to the control component 40. When a device is connected to the port circuit 10, the connected device can be identified through the port circuit 10 and the control component 40. After successful identification, the control component 40 executes a charging or discharging strategy according to the device type, controls the bidirectional charge pump circuit 30 and the DC-DC converter circuit 20 to operate, and completes the charging and discharging management.

[0030] Specifically, when the accessed device is identified as a charging device, it indicates that the battery connected to the low-voltage end of the bidirectional charge pump circuit 30 needs to be charged. The electrical energy of the charging device is processed by the DC-DC converter circuit 20, enters the bidirectional charge pump circuit 30 from the high-voltage end for voltage reduction, and finally flows into the battery from the low-voltage end. When the accessed device is identified as an electrical load, it indicates that the battery connected to the low-voltage end of the bidirectional charge pump circuit 30 needs to discharge the electrical load. The electrical energy of the battery enters the bidirectional charge pump circuit 30 from the low-voltage end for voltage boosting, and then flows into the DC-DC converter circuit 20 from the high-voltage end, and finally flows into the electrical load.

[0031] It should be noted that the type of battery referred to in the embodiments of this application is not unique. Depending on actual needs, it can be a single cell, a battery string formed by two or more cells connected in series or / or in parallel, or a battery pack formed by connecting multiple battery strings, etc., and there is no specific limitation.

[0032] In the embodiment of this application, during battery discharge, the battery output energy is processed by a bidirectional charge pump and a DC-DC converter circuit 20. The voltage output by the port circuit 10 is greater than the battery voltage. Taking a common single-cell power supply of 3V-4.2V as an example, the suitable output voltage is actually 5V-12V, and the suitable maximum output power is about 18W. After processing by the charging and discharging circuit of this embodiment, the voltage output by the port circuit 10 is greater than 12V. Due to the increase in voltage, the final output power is greater than 18W, that is, a large power output is achieved with a single cell.

[0033] In another embodiment, the battery can also be a dual-cell battery. Taking a commonly used dual-cell power supply of 6V-8.4V as an example, its suitable output voltage is 5V-20V, and its suitable maximum output power is 30W-45W. After processing using the charging and discharging circuit of this embodiment, the voltage output by port circuit 10 is greater than 20V. Due to the increase in voltage, the final output power will be greater than 45W. Correspondingly, other multi-cell battery strings can be similarly processed, and their output power can be increased through the charging and discharging circuit to exceed the output power of the battery string.

[0034] The aforementioned charging and discharging circuit includes a port circuit 10, a DC-DC converter circuit 20, a bidirectional charge pump circuit 30, and a control component 40. The port circuit 10, DC-DC converter circuit 20, and bidirectional charge pump circuit 30 are all connected to the control component 40. The low-voltage terminal of the bidirectional charge pump circuit 30 is directly connected to the battery, while the high-voltage terminal of the bidirectional charge pump circuit 30 is connected to the port circuit 10 via the DC-DC converter circuit 20. The port circuit 10 can be connected to a charging device or an electrical load as needed. When a charging device is connected to the port circuit 10, the electrical energy output from the charging device undergoes DC-DC conversion via the DC-DC converter circuit 20, is then stepped down by the bidirectional charge pump circuit 30, and transmitted to the battery to charge it. When an electrical load is connected to the port circuit 10, the electrical energy output from the battery is stepped up by the bidirectional charge pump circuit 30, and then passes through the DC-DC converter circuit 20 and the port circuit 10 at a higher voltage to power the electrical load. This solution can boost the voltage of the battery and supply it to the electrical load, providing power with a larger output power. Even with a small number of batteries, a larger output power can be achieved, solving the problem that current power supply equipment cannot achieve high power supply with a small number of battery cells.

[0035] Please see Figure 2 In one embodiment, the port circuit 10 includes a connected protocol identification circuit 12 and a connection port 11. The protocol identification circuit 12 is connected to the control component 40 and the DC-DC converter circuit 20. The protocol identification circuit 12 is used to identify the charging and discharging protocol of the access device.

[0036] Specifically, the protocol identification circuit 12 is the circuit that identifies the charging and discharging protocol, and the connection port 11 is the port through which the electrical load or charging device is connected. The connected device is the charging device or electrical load connected to the port circuit 10. It should be noted that the type of protocol identification circuit 12 is not unique; it can be a Universal Serial Bus (USB) interface circuit, such as a Type-A interface circuit, a Type-B interface, or a Type-C interface, etc., and is not specifically limited. In this embodiment, the protocol identification circuit 12 is set at the port circuit 10 to identify the protocol, so that the charging and discharging circuit can charge and discharge devices that meet the required protocol, thereby improving the reliability of charging and discharging.

[0037] For a more detailed description, please refer to one embodiment. Figure 3 The protocol identification circuit 12 includes a Type-A interface circuit and a Type-C interface circuit. The circuit corresponding to port A in the figure is the Type-A interface circuit. The Type-C interface circuit includes two parts: a bidirectional C-line and a bidirectional C-female connector. The C-line is the insertion end, used to insert into the Type-C female connector of the device. The C-female connector is the interface on the device side, used to receive the insertion of the Type-C male connector.

[0038] Please see Figure 4 In one embodiment, the control component 40 includes a protocol processor 41 and a controller 42 connected together. The protocol identification circuit 12 is connected to the protocol processor 41, and the DC-DC converter circuit 20 and the bidirectional charge pump circuit 30 are respectively connected to the controller 42. The protocol processor 41 is used to perform charge and discharge protocol verification, and the controller 42 is used to control the DC-DC converter circuit 20 and the bidirectional charge pump circuit 30 to charge and discharge according to the verification result.

[0039] Specifically, the protocol processor 41 is the processing device that determines whether the connected device meets the charging and discharging protocol based on the output of the protocol identification circuit 12. The controller 42 is the device that controls the operation of the DC-DC converter circuit 20 and the bidirectional charge pump circuit 30 to realize charging and discharging management.

[0040] In a real-world scenario, when a charging device or electrical load is connected to connection port 11, the protocol processor 41 first sends a request signal. This request signal is transmitted to the charging device or electrical load via the protocol identification circuit 12. Upon receiving the request signal, the charging device or electrical load selects a suitable voltage and current combination to respond based on its own protocol status. Similarly, this combination is identified by the protocol identification circuit 12 and sent to the protocol processor 41. The protocol processor 41 then performs a charging and discharging protocol verification, i.e., verifies whether it possesses a charging and discharging protocol that matches the charging device or electrical load. If the verification passes, indicating the existence of a matching charging and discharging protocol, the verification result is communicated to the controller 42. If the connected device is a charging device, the DC-DC converter circuit 20 and the bidirectional charge pump circuit 30 are controlled to operate in charging mode; if the connected device is an electrical load, the DC-DC converter circuit 20 and the bidirectional charge pump circuit 30 are controlled to operate in discharging mode.

[0041] The solution in this embodiment uses different devices for protocol processing and charge / discharge control, which can effectively alleviate data processing pressure.

[0042] It is understood that in other embodiments, the control component 40 includes a protocol control integrated processor. That is, the charge / discharge protocol verification and charge / discharge control functions are integrated into the same processing chip. The specific choice depends on actual needs and is not limited here. For example, in a more detailed embodiment, a more advanced processor may be used. Figure 5 The protocol / controller shown implements protocol processing and charge / discharge control.

[0043] In one embodiment, there are multiple connection ports 11, each of which is of a different type, and the multiple connection ports 11 are connected to the same protocol identification circuit 12.

[0044] Specifically, in this embodiment, the same protocol identification circuit 12 can connect to multiple different types of connection ports. Thus, charging devices or electrical loads with different interface signals can all be connected to the DC-DC converter circuit 20 through the same protocol identification circuit 12 to achieve charging or discharging, effectively reducing circuit cost and size.

[0045] In one embodiment, there are multiple DC-DC converter circuits 20, each DC-DC converter circuit 20 is connected to the high voltage terminal of the bidirectional charge pump circuit 30, and each DC-DC converter circuit 20 is connected to a protocol identification circuit 12.

[0046] Specifically, in this embodiment, multiple DC-DC converter circuits 20 are configured at the high-voltage end of the bidirectional charge pump circuit 30, and each DC-DC converter circuit 20 is equipped with a corresponding port circuit 10. This satisfies the requirement for independent output or input functions of the charging circuit, enabling simultaneous charging and discharging, simultaneous charging of multiple electrical loads, and simultaneous charging of the battery using multiple charging devices, greatly improving the ease of use of the charging circuit.

[0047] It should be noted that the type of DC-DC converter circuit 20 is not unique; it can be selected based on actual needs. The only requirement is that the voltage output to the electrical load after processing by the DC-DC converter circuit 20 is higher than the battery voltage, thereby increasing the battery's output power. In one embodiment, the DC-DC converter circuit 20 includes at least one of a boost DC-DC converter circuit, a buck DC-DC converter circuit, and a buck-boost DC-DC converter circuit.

[0048] Specifically, a boost DC-DC converter, also known as a step-up converter, can increase the input voltage to a higher output voltage. A buck DC-DC converter, also known as a step-down converter, can decrease the input voltage to a lower output voltage. A buck-boost DC-DC converter, also known as a buck-boost converter, can simultaneously perform voltage boosting within a certain range.

[0049] When the bidirectional charge pump circuit 30 operates in boost mode, the DC-DC converter circuit 20 converts the electrical energy from the bidirectional charge pump circuit 30 into a suitable voltage before transmitting it to the electrical load. When the bidirectional charge pump circuit 30 operates in buck mode, the DC-DC converter circuit 20 converts the electrical energy from the charging device into a certain value, and then the bidirectional charge pump circuit 30 steps it down to a suitable voltage for the battery to charge it.

[0050] In practical scenarios, the charging and discharging circuit can be configured with any of the above-mentioned types of DC-DC converter circuits, and the number of such circuits can be one or more. Alternatively, two or more of the above-mentioned types of DC-DC converter circuits can be configured, and the number of each type of DC-DC converter circuit can be one or more, without any specific limitation.

[0051] In a more detailed embodiment, the structure of the DC-DC converter circuit 20 is as follows: Figure 3 As shown, the connection point between the DC-DC converter circuit 20 and the port circuit 10 is VOUT1.

[0052] In one embodiment, the voltage ratio between the high-voltage end and the low-voltage end of the bidirectional charge pump circuit 30 is n:m, where n and m are both positive integers and m is less than n.

[0053] Specifically, the voltage ratio between the high-voltage and low-voltage terminals of the bidirectional charge pump circuit 30 is n:m. This means that when the bidirectional charge pump circuit 30 operates in boost mode, the ratio of the input voltage (low-voltage terminal) to the output voltage (high-voltage terminal) is m:n; and when the bidirectional charge pump circuit 30 operates in buck mode, the ratio is n:m. Correspondingly, the number of DC-DC converter circuits 20 connected to the high-voltage terminal of the bidirectional charge pump circuit 30 can be n, while the battery connected to the low-voltage terminal of the bidirectional charge pump circuit 30 includes m cells connected in series. Through this embodiment, different types of bidirectional charge pump circuits 30 can be selected according to actual needs to meet different output requirements.

[0054] It should be noted that the specific values ​​of n and m are not unique. n can be greater than or equal to 2, and m can be greater than or equal to 1. That is, the voltage ratio between the high voltage end and the low voltage end of the bidirectional charge pump circuit 30 can be 2:1, 3:1, 3:2, 4:1, 4:2, etc., and there is no specific limitation.

[0055] It is understood that the type of bidirectional charge pump circuit 30 can be selected according to the output power requirement or the output voltage. Taking the amplification of the battery voltage by an integer multiple as an example, in one embodiment, the voltage ratio of the high voltage end to the low voltage end of the bidirectional charge pump circuit 30 is n:1, where n is a positive integer greater than 1.

[0056] Specifically, in this embodiment, the battery output voltage is used as the base value. The bidirectional charge pump circuit 30 can amplify the battery voltage by an integer multiple before outputting it to meet the boost requirement that the output voltage is an integer multiple of the battery voltage. Correspondingly, the voltage ratio between the high-voltage end and the low-voltage end of the bidirectional charge pump circuit 30 can be n:1. If n is 2, the output voltage is amplified by two times; if n is 3, the output voltage is amplified by three times.

[0057] The above solution, when using lithium batteries, can also save on the lithium battery balancing circuit, thus reducing the size and cost of the charging and discharging circuit.

[0058] For a more detailed description, please refer to one of the embodiments. Figure 6 The voltage ratio between the high-voltage and low-voltage terminals of the bidirectional charge pump circuit 30 is 2:1. The VBUS port of the bidirectional charge pump circuit 30 is connected to the DC-DC converter circuit 20, specifically connected to... Figure 3The BAT+ terminal of the DC-DC converter circuit 20 and the BATP port of the bidirectional charge pump circuit 30 are connected to the battery. This allows the battery voltage to be boosted to twice its original value before being output, thus meeting high-power output requirements.

[0059] To facilitate understanding of the technical solution of this application, the following detailed embodiments will be used to explain and illustrate this application.

[0060] In this embodiment, the port circuit 10 includes a protocol identification circuit 12 and a connection port 11. The protocol identification circuit 12 includes a Type-A interface circuit and a Type-C interface circuit. The control component 40 adopts a protocol / control chip that integrates protocol identification and charge / discharge control. The DC-DC converter circuit 20 adopts a step-up / step-down type DC-DC converter circuit 20. The voltage ratio between the high-voltage end and the low-voltage end of the bidirectional charge pump circuit 30 is 2:1. The battery adopts a single-cell battery.

[0061] In a real-world scenario, when the protocol identification circuit 12 detects that a device has been connected to the connection port 11, it sends an identification signal back to the protocol / control chip. If the protocol / control chip detects that the connected device is a charging device through the identification signal, it controls the DC-DC converter circuit 20 and the bidirectional charge pump circuit 30 to operate. The voltage input by the charging device is processed by the DC-DC converter circuit 20 and then stepped down by the high-voltage end of the bidirectional charge pump circuit 30. The voltage is then output from the low-voltage end to the battery at half the voltage of the high-voltage end to charge the single-cell battery.

[0062] If the protocol / control chip detects that the connected device is an electrical load by identifying the signal, it controls the operation of the DC-DC converter circuit 20 and the bidirectional charge pump circuit 30. The voltage output by the single-cell battery flows into the low-voltage end of the bidirectional charge pump circuit 30 for boosting. The DC-DC converter circuit 20 processes the voltage to twice the battery voltage output value, obtaining a voltage higher than the battery voltage and outputting it to the electrical load, thereby achieving high-power power supply to the electrical load.

[0063] In one embodiment, this application also provides a power supply device, including a battery and the above-described charging and discharging circuit.

[0064] Specifically, the structure and operating principle of the charging and discharging circuit are as shown in the above embodiments and accompanying drawings, and will not be repeated here. This power supply device's charging and discharging circuit includes a port circuit 10, a DC-DC converter circuit 20, a bidirectional charge pump circuit 30, and a control component 40. The port circuit 10, DC-DC converter circuit 20, and bidirectional charge pump circuit 30 are respectively connected to the control component 40. The low-voltage end of the bidirectional charge pump circuit 30 is directly connected to the battery, while the high-voltage end of the bidirectional charge pump circuit 30 is connected to the port circuit 10 through the DC-DC converter circuit 20. The port circuit 10 can be connected to a charging device or an electrical load according to actual needs. When a charging device is connected to the port circuit 10, the electrical energy output by the charging device undergoes DC-DC conversion through the DC-DC converter circuit 20, is then stepped down by the bidirectional charge pump circuit 30, and transmitted to the battery to charge it. When an electrical load is connected to the port circuit 10, the electrical energy output by the battery is stepped up by the bidirectional charge pump circuit 30, and then passes through the DC-DC converter circuit 20 and the port circuit 10 at a higher voltage to power the electrical load. This solution can boost the voltage of the battery and supply it to the electrical load, providing power with a larger output power. Even with a small number of batteries, a larger output power can be achieved, solving the problem that current power supply equipment cannot achieve high power supply with a small number of battery cells.

[0065] In one embodiment, the battery is a single-cell battery.

[0066] Specifically, a single-cell battery is a battery with only one cell. In other embodiments, battery strings consisting of two or more cells can be used, depending on the requirements; there is no specific limitation.

[0067] It should be noted that, in one embodiment, the battery should include the battery body and its protection circuit (including overvoltage and overcurrent protection, etc.), which will not be elaborated here.

[0068] It is understood that the type of power supply device is not unique; in one embodiment, the power supply device is a portable power bank. Through the solution of this embodiment, the portable power bank can achieve higher power output with a lower number of battery cells, thereby increasing the output power of the portable power bank and meeting high-power electricity demands.

[0069] In the description of this specification, references to terms such as "some embodiments," "other embodiments," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative descriptions of the above terms do not necessarily refer to the same embodiments or examples.

[0070] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0071] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these modifications and improvements all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A charge-discharge circuit characterized by comprising: include: Port circuits are used to connect charging devices or electrical loads. A DC-DC converter circuit, connected to the port circuit; A bidirectional charge pump circuit is provided, wherein the high-voltage terminal of the bidirectional charge pump circuit is connected to the DC-DC converter circuit, and the low-voltage terminal of the bidirectional charge pump circuit is used to connect to the battery; the bidirectional charge pump circuit is used to step down the electrical energy output by the DC-DC converter circuit and transmit it to the battery when the port circuit is connected to a charging device, and to step up the electrical energy output by the battery and transmit it to the DC-DC converter circuit when the port circuit is connected to an electrical load. The control component, the port circuit, the DC-DC converter circuit, and the bidirectional charge pump circuit are respectively connected to the control component.

2. The charge-discharge circuit according to claim 1, wherein The port circuit includes a connected protocol identification circuit and a connection port. The protocol identification circuit is connected to the control component and the DC-DC converter circuit. The protocol identification circuit is used to identify the charging and discharging protocol of the access device.

3. The charge and discharge circuit according to claim 2, wherein The control component includes a protocol processor and a controller connected together. The protocol identification circuit is connected to the protocol processor. The DC-DC converter circuit and the bidirectional charge pump circuit are respectively connected to the controller. The protocol processor is used to perform charge and discharge protocol verification. The controller is used to control the DC-DC converter circuit and the bidirectional charge pump circuit to charge and discharge according to the verification result.

4. The charge and discharge circuit according to claim 2, wherein The control component includes a protocol control integrated processor.

5. The charge and discharge circuit according to claim 2, wherein The number of connection ports is multiple, and the types of each connection port are different. The multiple connection ports are respectively connected to the same protocol identification circuit.

6. The charge and discharge circuit according to any one of claims 2 to 5, wherein There are multiple DC-DC converter circuits, each of which is connected to the high-voltage terminal of the bidirectional charge pump circuit, and each DC-DC converter circuit is connected to a corresponding protocol identification circuit.

7. The charge-discharge circuit according to any one of claims 1-5, characterized in that, The DC-DC converter circuit includes at least one of a boost DC-DC converter circuit, a buck DC-DC converter circuit, and a buck-boost DC-DC converter circuit.

8. The charge and discharge circuit according to any one of claims 1 to 5, characterized by, The voltage ratio between the high-voltage end and the low-voltage end of the bidirectional charge pump circuit is n:m, where n and m are both positive integers, and m is less than n.

9. The charge and discharge circuit according to claim 8, wherein The voltage ratio between the high-voltage end and the low-voltage end of the bidirectional charge pump circuit is n:

1.

10. A power supply device characterized by comprising: Includes a battery and the charging / discharging circuit as described in any one of claims 1-9.

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