Power supply circuit and electronic equipment

Abstract

The utility model relates to a power supply circuit and electronic equipment, and the electronic equipment comprises a main power supply circuit which is electrically connected with a battery and is used for charging the battery; the peripheral power supply circuit is electrically connected with peripheral electric devices and is used for supplying power to the peripheral electric devices; the main power supply circuit and the peripheral power supply circuit are electrically connected with an external power supply. Based on the scheme, the battery can be prevented from being repeatedly recharged in the charging process, the service life of the battery is prolonged, and the charging safety is improved.

Description

Technical Field

[0001] The present application relates to the technical field of electronic equipment, and in particular to a power supply circuit and electronic equipment. Background Art

[0002] Existing mobile terminals usually use a step-down charging circuit to achieve low-power charging for the mobile terminal, and then add a charge pump as a fast charging device according to the fast charging power requirements.

[0003] For example, a tablet device that supports fast charging requires a charge pump function to improve charging efficiency and reduce losses and heat during charging. However, tablets inherently consume a lot of power. For example, when the screen is on, it can draw a maximum of 4A. When the battery is fully charged, the charge pump is disabled. Because the charge pump is unable to power the mobile terminal's system, the mobile terminal requires a step-down charging circuit to maintain the system. However, the power conversion capacity of a single step-down charging circuit is limited, so the battery will power the system. When the battery is depleted to a certain level, the battery voltage and charge level drop, and the step-down charging circuit will start charging the battery. This ultimately leads to frequent recharging of the battery near full charge, which shortens battery life and affects charging safety. Utility Model Content

[0004] In order to solve the above technical problems or at least partially solve the above technical problems, the present application provides a power supply circuit and an electronic device.

[0005] In a first aspect, the present application provides a power supply circuit, comprising:

[0006] a main power supply circuit, electrically connected to the battery and used to charge the battery;

[0007] A peripheral power supply circuit, electrically connected to peripheral electrical devices, for supplying power to the peripheral electrical devices;

[0008] The main power supply circuit and the peripheral power supply circuit are both electrically connected to an external power source.

[0009] Optionally, the peripheral power supply circuit includes a first step-down charging circuit;

[0010] The first end of the first step-down charging circuit is electrically connected to the peripheral electrical device, and the first step-down charging circuit is electrically connected to an external power supply.

[0011] Optionally, the main power supply circuit includes a second step-down charging circuit and a charge pump;

[0012] A first end of the second step-down charging circuit is electrically connected to the battery, and a second end of the second step-down charging circuit is electrically connected to the external power supply;

[0013] A first terminal of the charge pump is electrically connected to the battery, and a second terminal of the charge pump is electrically connected to the external power source.

[0014] Optionally, a voltage and current detection component is also included;

[0015] The voltage and current detection component is electrically connected between the main power supply circuit and the battery, and is used to detect the charging current between the main power supply circuit and the battery, as well as the voltage of the battery;

[0016] When the voltage of the battery is greater than or equal to a first voltage threshold and / or the charging current is less than or equal to a first current threshold, the circuit between the charge pump and the battery is disconnected; when the voltage of the battery is greater than or equal to a second voltage threshold and / or the charging current is less than or equal to a second current threshold, the circuit between the second step-down charging circuit and the battery is disconnected;

[0017] The first voltage threshold is smaller than the second voltage threshold, and the first current threshold is larger than the second current threshold.

[0018] Optionally, the battery is used to power a main electrical device, and the power of the peripheral electrical devices is greater than the power of the main electrical device.

[0019] Optionally, the main power supply circuit is also used to supply power to the main electrical components and the peripheral electrical components.

[0020] In a second aspect, the present application further provides an electronic device, comprising the power supply circuit according to any one of the first aspects;

[0021] The electronic device further includes the battery and the peripheral electrical components.

[0022] Optionally, the electronic device further includes a power management circuit;

[0023] A first end of the power management circuit is electrically connected to the battery, and a second end of the power management circuit is electrically connected to the peripheral electrical device.

[0024] Optionally, the main power supply circuit is electrically connected to the first end of the power management circuit.

[0025] Optionally, the electronic device further includes a main electrical device; the second end of the power management circuit is electrically connected to the main electrical device; the main electrical device includes at least a CPU;

[0026] The power management circuit is further configured to detect the voltage of the battery. When the voltage of the battery is greater than or equal to a third voltage threshold, the power management circuit controls the power supply and / or the main power supply circuit to supply power to the CPU.

[0027] The power supply circuit provided in this application has the following advantages over existing technical solutions:

[0028] This application provides a main power supply circuit and a peripheral power supply circuit. Specifically, while the main power supply circuit is charging the battery, the peripheral power supply circuit independently supplies power to peripheral electrical devices. Therefore, because the peripheral power supply circuit can meet the power needs of the peripheral electrical devices, the power supply circuit in this application does not require the main power supply circuit to supply power to the peripheral devices. Furthermore, there is no problem of the battery discharging to the peripheral electrical devices during charging due to insufficient power in the main power supply circuit, resulting in the battery being depleted and requiring frequent recharging. In other words, this application can prevent the battery from being repeatedly recharged during charging, which is beneficial for improving battery life and charging safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A schematic diagram of a power supply circuit structure provided in an embodiment of the present application;

[0030] Figure 2 A schematic diagram of another power supply circuit structure provided in an embodiment of the present application;

[0031] Figure 3 A schematic diagram of another power supply circuit structure provided in an embodiment of the present application;

[0032] Figure 4 A schematic diagram of the circuit structure of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0033] In order to more clearly understand the above-mentioned objectives, features and advantages of the present application, the scheme of the present application will be further described below. It should be noted that, in the absence of conflict, the embodiments of the present application and the features therein can be combined with each other.

[0034] In the following description, many specific details are set forth to facilitate a full understanding of the present application, but the present application can also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present application, not all of the embodiments.

[0035] In related solutions, the step-down charging circuit and the charge pump jointly charge the battery during the charging process. After the battery is fully charged, the circuit corresponding to the charge pump is disconnected. When the CPU and other peripheral electrical devices are in operation, they are preferentially powered by the step-down charging circuit. However, the step-down charging circuit has limited power. If the power of the peripheral electrical device exceeds the maximum power that the step-down charging circuit can provide to the peripheral electrical device, the battery will be forced to supply power to the peripheral electrical device. This will cause the battery to frequently recharge near full charge, shortening the battery life and posing a safety hazard.

[0036] Based on the above technical problems, the present application provides a power supply circuit. Figure 1 A schematic diagram of a power supply circuit structure provided in an embodiment of the present application, the power supply circuit includes:

[0037] The main power supply circuit 101 is electrically connected to the battery 200 and is used to charge the battery 200 .

[0038] The peripheral power supply circuit 102 is electrically connected to the peripheral electrical devices 300 and is used to supply power to the peripheral electrical devices 300 .

[0039] The main power supply circuit 101 and the peripheral power supply circuit 102 are both electrically connected to an external power source 400 .

[0040] The power supply circuit in the embodiment of the present application is shown as 100. The main power supply circuit 101 in the embodiment of the present application represents a circuit structure that can be electrically connected to an external power source 400 and charge the battery 200. The peripheral power supply circuit 102 in the embodiment of the present application represents a circuit structure that directly powers the peripheral electrical devices 300, and the power supply of the peripheral power supply circuit 102 structure is greater than or equal to the maximum power consumption of the peripheral electrical devices 300. The peripheral electrical devices 300 can be any electrical devices, such as a screen, a speaker, a communication antenna, etc.

[0041] Based on the above solution, since the present application can charge the battery 200 through the main power supply circuit 101 during the charging process of the battery 200, and directly power the peripheral electrical devices 300 through the peripheral power supply circuit 102. During the charging process of the battery 200, there is no need to draw power from the battery 200, and the power of the battery 200 will not be consumed. Therefore, the battery 200 will no longer be frequently recharged near full charge, which is conducive to extending the service life of the battery 200 and improving the safety of the charging process.

[0042] In some embodiments, the peripheral power supply circuit 102 includes a first buck charging circuit.

[0043] A first end of the first step-down charging circuit is electrically connected to the peripheral electrical device 300 , and the first step-down charging circuit is electrically connected to the external power source 400 .

[0044] The first step-down charging circuit is an integrated circuit for converting the high voltage power of the external power supply 400 into a stable low voltage power, such as a BUCK IC, etc. The first step-down charging circuit can stably supply power to the peripheral electrical devices 300.

[0045] Figure 2 This is another schematic diagram of a power supply circuit structure provided in an embodiment of the present application. In some embodiments, the main power supply circuit 101 includes a second step-down charging circuit 1011 and a charge pump 1012 .

[0046] A first end of the second step-down charging circuit 1011 is electrically connected to the battery 200 , and a second end of the second step-down charging circuit 1011 is electrically connected to the external power source 400 .

[0047] A first terminal of the charge pump 1012 is electrically connected to the battery 200 , and a second terminal of the charge pump 1012 is electrically connected to the external power source 400 .

[0048] The charge pump 1012, also known as a switched capacitor voltage converter, is a DC-DC converter that uses so-called "flying" or "pumping" capacitors (rather than inductors or transformers) to store energy. In this embodiment of the present application, the output power of the second step-down charging circuit 1011 is lower than the output power of the charge pump 1012. The charge pump 1012 is used to improve the charging efficiency of the battery 200.

[0049] Figure 3 This is another schematic diagram of a power supply circuit structure provided in an embodiment of the present application. In some embodiments, a voltage and current detection component 103 is further included.

[0050] The voltage and current detection component 103 is electrically connected between the main power supply circuit 101 and the battery 200 . The voltage and current detection component 103 is used to detect the charging current between the main power supply circuit 101 and the battery 200 , as well as the voltage of the battery 200 .

[0051] When the voltage of the battery 200 is greater than or equal to the first voltage threshold and / or the charging current is less than or equal to the first current threshold, the circuit between the charge pump 1012 and the battery 200 is disconnected; when the voltage of the battery 200 is greater than or equal to the second voltage threshold and / or the charging current is less than or equal to the second current threshold, the circuit between the second step-down charging circuit 1011 and the battery 200 is disconnected.

[0052] The first voltage threshold is smaller than the second voltage threshold, and the first current threshold is larger than the second current threshold.

[0053] Specifically, the voltage of the battery 200 detected by the voltage and current detection component 103 is the voltage that the battery 200 can output. The voltage that the battery 200 can output will change under different remaining power levels. Generally speaking, when the battery 200 is at its maximum power level, the voltage that can be output is the highest. As the remaining power level gradually decreases, the voltage that the battery 200 can output also tends to decrease. The charging current of the second step-down charging circuit to the battery 200 tends to gradually decrease as the remaining power level of the battery 200 gradually increases. When the remaining power level of the battery 200 is lower than a certain threshold A, the charging current generally remains at a certain specific maximum value of the charging current. When the remaining power level of the battery 200 is greater than a certain threshold B, the charging current tends to gradually decrease until the remaining power level of the battery 200 is at its maximum, at which point the charging current approaches (or is equal to) zero. It should be noted that in the above description, threshold A is less than threshold B.

[0054] In the embodiment of the present application, the voltage and charging current of the battery 200 can be detected by the voltage and current detection component 103. When the voltage of the battery 200 is greater than or equal to the first voltage threshold and / or the charging current is less than or equal to the first current threshold, the circuit between the charge pump 1012 and the battery 200 is disconnected, and the charge pump 1012 no longer charges the battery 200. The second step-down charging circuit 1011 continues to charge the battery 200. When the voltage of the battery 200 reaches the second voltage threshold and / or the charging current is less than or equal to the second current threshold (for example, the charging current is 0), it indicates that the remaining power of the battery 200 is the maximum value, and the second step-down charging circuit 1011 stops charging the battery 200. In some embodiments, the voltage and current detection component 103 may also be integrated into the main power supply circuit 101, which will not be described in detail here.

[0055] In some embodiments, the battery 200 is used to power the main electrical device, and the power of the peripheral electrical device 300 is greater than the power of the main electrical device.

[0056] In the embodiment of the present application, the power of the peripheral electrical devices 300 is relatively high, which may cause the battery 200 to frequently lose power during the charging process. Therefore, in the embodiment of the present application, the peripheral electrical devices 300 are powered separately by a separate peripheral power supply circuit 102, and the battery is used to power the main electrical devices, thereby preventing the battery from frequently losing power and being repeatedly recharged.

[0057] In some embodiments, the main power supply circuit 101 is also used to supply power to the main electrical devices and the peripheral electrical devices 300 .

[0058] Specifically, the embodiment of the present application can also supply power to the main electrical devices and some peripheral electrical devices 300 through the main power supply circuit 101 when the battery 200 is fully charged, thereby preventing the main electrical devices and peripheral electrical devices 300 from drawing power from the battery.

[0059] An embodiment of the present application further provides an electronic device, which includes a power supply circuit as described in any one of the above power supply circuit embodiments.

[0060] The electronic device further includes a battery 200 and peripheral electrical devices 300 .

[0061] The electronic device provided in the embodiment of the present application can solve the same technical problems and achieve the same technical effects as the above-mentioned power supply circuit embodiment, which will not be repeated here.

[0062] In some embodiments, the number of peripheral electrical devices 300 and the number of peripheral power supply circuits 102 correspond one to one. For example, if there is one peripheral electrical device 300, there is also one peripheral power supply circuit 102. This ensures that each peripheral electrical device 300 can be powered by a separate peripheral power supply circuit 102, ensuring power supply stability.

[0063] Figure 4 This is a schematic diagram of a circuit structure of an electronic device provided in an embodiment of the present application. In some embodiments, the electronic device further includes a power management circuit 104.

[0064] A first terminal of the power management circuit 104 is electrically connected to the battery 200 , and a second terminal of the power management circuit 104 is electrically connected to the peripheral electrical device 300 .

[0065] The power management circuit 104 can be a power management integrated circuit (PMIC), which can provide power to the peripheral electrical devices 300 electrically connected thereto. By directly connecting the power management circuit 104 to the peripheral electrical devices 300, the peripheral electrical devices 300 can be prevented from malfunctioning when the external power supply 400 is disconnected (for example, when the external power supply 400 is removed).

[0066] Continue reading Figure 4 In some embodiments, the main power supply circuit 101 is electrically connected to a first terminal of the power management circuit 104 .

[0067] Based on the above solution, the embodiment of the present application can supply power to certain peripheral electrical devices 300 through the main power supply circuit 101 when the battery 200 is fully charged.

[0068] Continue reading Figure 4In some embodiments, the electronic device further includes a main electrical device 105 , which includes at least a CPU. The second terminal of the power management circuit 104 is electrically connected to the main electrical device 105 .

[0069] The power management circuit 104 is further configured to detect the voltage of the battery 200 . If the voltage of the battery 200 is greater than or equal to a third voltage threshold, the power management circuit 104 controls the power supply to supply power to the CPU.

[0070] Specifically, when the electronic device in the embodiment of the present application starts the system via the CPU, it can first determine the voltage of the battery 200. If the voltage of the battery 200 is less than a third voltage threshold (e.g., 3.6V), the power supply to the CPU is temporarily suspended, that is, the system is temporarily suspended, and the battery 200 is prioritized for charging. The system is then started until the voltage of the battery 200 is greater than or equal to the third voltage threshold. This can avoid the system from failing to start due to insufficient power supply.

[0071] In some embodiments, the power of the peripheral electrical devices is greater than the power of the main electrical devices.

[0072] Specifically, by supplying power to higher-power peripheral electrical devices through a separate peripheral power supply circuit, it is possible to avoid consumption of power of the battery 200 by the peripheral power supply circuit and avoid battery recharging.

[0073] In some embodiments, the peripheral electrical device 300 further includes at least a speaker.

[0074] The peripheral electrical devices 300 in the embodiment of the present application generally refer to high-power electrical devices, such as speakers, etc. By providing separate power to these high-power electrical devices, it is possible to prevent the peripheral electrical devices 300 from drawing power from the battery 200, thereby avoiding repeated recharging of the battery 200. In addition, the peripheral electrical devices 300 in the embodiment of the present application may also include, for example, display screens, etc., which are not listed here one by one.

[0075] In some embodiments, the electronic device includes at least a mobile phone, a smart watch, a tablet computer, and a laptop computer.

[0076] The electronic device in the embodiment of the present application can be a portable mobile terminal with a built-in battery, such as a mobile phone, a smart watch, a tablet computer, a laptop computer, etc.

[0077] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprises" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a..." do not exclude the presence of other identical elements in the process, method, article or device that includes the elements.

[0078] Thus far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art may make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will fall within the scope of protection of the present invention.

Claims

1. A power supply circuit, characterized in that: The power supply circuit includes: a main power supply circuit, electrically connected to the battery and used to charge the battery; A peripheral power supply circuit, electrically connected to peripheral electrical devices, for supplying power to the peripheral electrical devices; The main power supply circuit and the peripheral power supply circuit are both electrically connected to an external power supply; The main power supply circuit includes a second step-down charging circuit and a charge pump; A first end of the second step-down charging circuit is electrically connected to the battery, and a second end of the second step-down charging circuit is electrically connected to the external power supply; A first end of the charge pump is electrically connected to the battery, and a second end of the charge pump is electrically connected to the external power supply; Also included are voltage and current detection components; The voltage and current detection component is electrically connected between the main power supply circuit and the battery, and is used to detect the charging current between the main power supply circuit and the battery, as well as the voltage of the battery; When the voltage of the battery is greater than or equal to a first voltage threshold and / or the charging current is less than or equal to a first current threshold, the circuit between the charge pump and the battery is disconnected; when the voltage of the battery is greater than or equal to a second voltage threshold and / or the charging current is less than or equal to a second current threshold, the circuit between the second step-down charging circuit and the battery is disconnected; The first voltage threshold is smaller than the second voltage threshold, and the first current threshold is larger than the second current threshold.

2. The power supply circuit according to claim 1, wherein: The peripheral power supply circuit includes a first step-down charging circuit; The first end of the first step-down charging circuit is electrically connected to the peripheral electrical device, and the first step-down charging circuit is electrically connected to an external power supply.

3. The power supply circuit according to claim 1, wherein: The battery is used to supply power to a main electrical device, and the power of the peripheral electrical devices is greater than the power of the main electrical device.

4. The power supply circuit according to claim 3, characterized in that: The main power supply circuit is also used to supply power to the main electrical components and the peripheral electrical components.

5. An electronic device, characterized in that: The electronic device comprises the power supply circuit according to any one of claims 1 to 4; The electronic device further includes the battery and the peripheral electrical components.

6. The electronic device according to claim 5, characterized in that The electronic device further includes a power management circuit; A first end of the power management circuit is electrically connected to the battery, and a second end of the power management circuit is electrically connected to the peripheral electrical device.

7. The electronic device according to claim 6, wherein: The main power supply circuit is electrically connected to a first end of the power management circuit.

8. The electronic device according to claim 6, wherein: The electronic device further includes a main electrical device; the second end of the power management circuit is electrically connected to the main electrical device; the main electrical device includes at least a CPU; The power management circuit is further configured to detect the voltage of the battery. When the voltage of the battery is greater than or equal to a third voltage threshold, the power management circuit controls the power supply and / or the main power supply circuit to supply power to the CPU.

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