Switching converter and electronic device

Abstract

The embodiment of the invention provides a switching type converter and electronic equipment. The switch type converter comprises a first connecting end, a second connecting end, a load connecting end, a power supply node, an inductor, a switch unit and a control circuit, the load connection end is used for drawing electric energy from a power supply node; the second connecting end is used for providing power for the power supply node; the control circuit is connected with the switch unit and controls the switch unit in a first control mode or a second control mode. Wherein in the first control mode, the switching type converter works in a voltage reduction mode, and the first connecting end absorbs electric energy from a power supply node; in the second control mode, the switching type converter works in a boost mode, and the first connecting end provides electric energy for the power supply node; when the negative change of the voltage of the power supply node meets the preset standard, the control circuit is switched from the first control mode to the second control mode. The system has a self-adaptive bidirectional energy transmission mechanism, and improves the response capability to load abrupt change and the voltage stability of a power supply node.

Description

Technical Field

[0001] The present application relates to the technical field of converters, and in particular to a switching converter and an electronic device. Background Art

[0002] The converter is a key component in electronic devices. It serves as a connecting bridge between the input power supply and the load, ensuring that the load obtains a stable and reliable operating voltage by achieving conversion between different voltage levels.

[0003] At present, the mainstream converters include two categories: inductor-based switching converters and capacitor-based charge pump converters. Among them, the switching converter relies on the process of inductor energy storage and release to adjust the output voltage by controlling the on-time of the switch tube, while the charge pump converter uses the switching charge and discharge of capacitors under different topological structures to achieve voltage conversion.

[0004] In actual application scenarios, converters face many special energy transmission requirements, which brings many challenges to the converters. Summary of the invention

[0005] The embodiments of the present application provide a switching converter and an electronic device, aiming to solve the problems existing in the existing converters.

[0006] In the first aspect, an embodiment of the present application provides a switching converter. The switching converter includes: a first connection terminal, a second connection terminal, a load connection terminal, a power supply node, an inductor, a switch unit and a control circuit; one end of the inductor is connected to the first connection terminal, and the other end of the inductor is connected to the power supply node through the switch unit; the load connection terminal is connected to the power supply node for drawing electric energy from the power supply node; the second connection terminal is connected to the power supply node for providing electric energy to the power supply node; the control circuit is connected to the switch unit to control the switch unit in a first control mode or a second control mode; wherein, in the first control mode, the switching converter operates in a buck mode, and the first connection terminal draws electric energy from the power supply node; in the second control mode, the switching converter operates in a boost mode, and the first connection terminal provides electric energy to the power supply node; when the negative change of the voltage of the power supply node meets the preset standard, the control circuit switches from the first control mode to the second control mode.

[0007] The switching converter realizes bidirectional transmission control of electric energy. When the voltage of the power supply node changes negatively and the converter switches from buck mode to boost mode, the direction of electric energy transmission is opposite, so that the energy stored in the inductor can be transmitted continuously without waiting for the inductor energy to be fully released before switching, ensuring that the switching converter can smoothly complete the mode switching. This adaptive bidirectional energy transmission mechanism effectively improves the response capability to load mutations and significantly improves the voltage stability of the power supply node.

[0008] In combination with the first aspect, in a possible implementation, the switch unit includes: a first controllable switch and a second controllable switch; wherein a first end of the first controllable switch is connected to one end of the inductor, a second end of the first controllable switch is connected to the power supply node, and a control end of the first controllable switch is connected to the control circuit; a second end of the second controllable switch is connected to one end of the inductor and the first end of the first controllable switch; a second end of the second controllable switch is connected to a reference ground, and a control end of the second controllable switch is connected to the control circuit.

[0009] By designing the switch unit as a structure consisting of a first controllable switch and a second controllable switch, the control circuit controls the conduction states of the two switch tubes respectively in different control modes. When the converter mode is switched, the inductor energy can be continuously transmitted, thereby improving the switching response speed and energy utilization efficiency.

[0010] In combination with the first aspect, or any one of the foregoing possible implementations of the first aspect, in another possible implementation, the first control mode includes: controlling the switch unit to alternately operate in a first inductor energy storage stage and a first inductor energy discharge stage; wherein the first inductor energy storage stage includes: keeping the second controllable switch off, and controlling the first controllable switch to be turned on; when the current of the inductor reaches a preset peak value, controlling the first controllable switch to be turned off; the first inductor energy discharge stage includes: keeping the first controllable switch off, and controlling the second controllable switch to be turned on to a preset first moment.

[0011] In the first control mode, a peak current control-based strategy is implemented. By controlling the operation of the switch unit, the inductor is controlled to switch orderly between the energy storage and energy release stages, so that the voltage of the power supply node can be converted into an ideal voltage or current and provided to the first connection terminal.

[0012] In combination with the first aspect, or any one of the foregoing possible implementations of the first aspect, in another possible implementation, the second control mode includes: controlling the switch unit to alternately operate in a second inductor energy discharging stage and a second inductor energy storing stage; wherein the second inductor energy discharging stage includes: keeping the first controllable switch off, and controlling the second controllable switch to be turned on; when the current of the inductor drops to a preset valley value, controlling the second controllable switch to be turned off; the second inductor energy storing stage includes: keeping the second controllable switch off, and controlling the first controllable switch to be turned on until a preset second moment.

[0013] In the second control mode, a strategy based on valley current control is adopted. By controlling the operation of the switching unit, the inductor is controlled to switch orderly between the energy release and energy storage stages, thereby quickly changing the direction of energy transmission and converting the first connection end into an electric energy output end to ensure the voltage stability of the power supply node.

[0014] In combination with the first aspect, or any one of the above possible implementations of the first aspect, in another possible implementation, the control circuit includes: a logic circuit, the logic circuit is used to: generate a corresponding pulse width modulation signal according to the first control mode or the second control mode; a first drive circuit, the input end of the first drive circuit is connected to the logic circuit, the output end of the first drive circuit is connected to the control end of the first controllable switch, the first drive circuit is used to: generate a corresponding first drive signal according to the received pulse width modulation signal, drive the first controllable switch to turn on or off the second drive circuit, the input end of the second drive circuit is connected to the logic circuit, the output end of the second drive circuit is connected to the control end of the second controllable switch, and the second drive circuit is used to: generate a corresponding second drive signal according to the received pulse width modulation signal, drive the second controllable switch to turn on or off.

[0015] In combination with the first aspect, or any one of the above possible implementations of the first aspect, in another possible implementation, the switching converter further includes: a first capacitor and a second capacitor; wherein one end of the first capacitor is connected to the first connection end, and the other end of the first capacitor is connected to a reference ground; one end of the second capacitor is connected to the power supply node, and the other end of the second capacitor is connected to a reference ground.

[0016] In a second aspect, an embodiment of the present application further provides an electronic device. The electronic device comprises: a selection switch circuit, the selection switch circuit comprising: a first input terminal, a second input terminal and a first output terminal; a battery, the battery is connected to the first input terminal and is used to provide a battery voltage; a switching converter as described above; the first connection terminal of the switching converter is connected to the battery, and the load connection terminal of the switching converter is connected to the second input terminal; a power amplifier; the power amplifier is connected to the first output terminal; wherein, when the battery voltage is greater than a first preset value, the selection switch circuit establishes an electrical connection between the first input terminal and the first output terminal, and the battery supplies power to the power amplifier; when the battery voltage is less than or equal to the first preset value and greater than a second preset value, the selection switch circuit establishes an electrical connection between the second input terminal and the first output terminal, and the load connection terminal of the switching converter supplies power to the power amplifier.

[0017] The electronic device uses a selective switch circuit. When the battery voltage is sufficient, the selective switch circuit directly establishes a power supply path from the battery to the power amplifier, avoiding additional conversion links and improving power supply efficiency. When the battery voltage decreases but is still within the usable range, it automatically switches to the load connection end of the switching converter for power supply, ensuring that the power amplifier obtains a stable operating voltage. As a result, the need to configure a boost converter separately for the power amplifier is eliminated, and the optimal power supply path under different battery voltage conditions is ensured.

[0018] In combination with the second aspect, in a possible implementation, the electronic device also includes: a charge pump type converter; wherein the charge pump type converter includes: a voltage input terminal connected to the battery and a voltage doubler output terminal connected to the second input terminal; when the battery voltage is less than or equal to the second preset value, the selection switch circuit establishes an electrical connection between the second input terminal and the first output terminal, and the power amplifier is powered by the voltage doubler output terminal of the charge pump type converter.

[0019] When the battery voltage drops to a lower level, the electronic device further provides the operating voltage required by the power amplifier in a voltage doubling manner through a charge pump converter, thereby extending the available voltage range of the battery and being suitable for application in new battery systems with a wider operating voltage range.

[0020] In combination with the second aspect, or any one of the above-mentioned possible implementations of the second aspect, in another possible implementation, the electronic device further includes: a power load unit; the selection switch circuit further includes: a second output terminal connected to the power load unit; wherein, when the first input terminal is electrically connected to the second output terminal, the power load unit is driven to operate in a first mode; and when the second input terminal is electrically connected to the second output terminal, the power load unit is driven to operate in a second mode.

[0021] When selecting and switching the power supply path of the power amplifier, the multi-way switching capability of the selection switch circuit originally used for the power load unit in the electronic device is reused. Without adding additional hardware, the optimal power supply path for the power amplifier is selected, thereby improving the utilization rate of the device.

[0022] In combination with the second aspect, or any one of the above possible implementations of the second aspect, in another possible implementation, the selection switch circuit includes: a third controllable switch, a fourth controllable switch and a fifth controllable switch; wherein a first end of the third controllable switch is connected to the first input end, and a second end of the third controllable switch is connected to a first end of the fifth controllable switch; a first end of the fourth controllable switch is connected to the second input end, and a second end of the fourth controllable switch is connected to a first end of the fifth controllable switch; a second end of the fourth controllable switch is also connected to the first output end; and a second end of the fifth controllable switch is connected to the second output end.

[0023] The selection switch circuit uses a smaller number of controllable switches while maintaining the original functions, thereby saving the chip area required and providing convenient conditions for the application of portable electronic devices.

[0024] In a third aspect, an embodiment of the present application provides an electronic device. The electronic device includes: a selection switch circuit, the selection switch circuit includes: a first input terminal, a second input terminal and a first output terminal; a battery, the battery is connected to the first input terminal, and is used to provide a battery voltage; a switching converter as described above; the first connection terminal of the switching converter is connected to the battery, and the load connection terminal of the switching converter is connected to the second input terminal; a power amplifier, the power amplifier is connected to the first output terminal; and an adapter, the adapter is connected to the second connection terminal of the switching converter; wherein, when the output power of the adapter meets the current power demand, the selection switch circuit establishes an electrical connection between the first input terminal and the first output terminal, and the adapter supplies power to the power amplifier; when the output power of the adapter does not meet the current power demand, the selection switch circuit establishes an electrical connection between the second input terminal and the first output terminal, and the adapter and the battery jointly supply power to the power amplifier.

[0025] The above-mentioned electronic device uses a selection switch circuit. When the adapter used can provide sufficient output power, the selection switch circuit directly establishes a power supply path from the adapter to the power amplifier, avoiding additional conversion links and improving power supply efficiency. When the adapter used cannot provide sufficient output power, it automatically switches to the adapter and battery to jointly power the power amplifier, ensuring that the power amplifier obtains a stable operating voltage and providing an optimal power supply path under different adapter conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0027] Figure 1 A schematic diagram of a switching converter provided in an embodiment of the present application;

[0028] Figure 2 A schematic diagram of a switching converter provided in another embodiment of the present application, showing a situation where the switching converter is applied to a battery charge and discharge manager;

[0029] Figure 3 A schematic diagram of the power transmission direction of the switching converter provided in an embodiment of the present application, showing the situation of working in the buck mode;

[0030] Figure 4 A schematic diagram of the power transmission direction of the switching converter provided in an embodiment of the present application, showing the situation of working in a boost mode;

[0031] Figure 5 A schematic diagram of the inductor energy storage stage and the inductor energy release stage of the switching converter provided in an embodiment of the present application, showing a situation where the control circuit uses the first control mode;

[0032] Figure 6 A schematic diagram of the inductor energy storage stage and the inductor energy release stage of the switching converter provided in an embodiment of the present application, showing a situation where the control circuit uses the second control mode;

[0033] Figure 7 A schematic diagram of a control circuit provided in an embodiment of the present application;

[0034] Figure 8 A signal waveform diagram of a switching converter provided in an embodiment of the present application, showing a situation of switching from a first control mode to a second control mode;

[0035] Fig. 9 is a schematic diagram of a typical electronic device;

[0036] Fig.10 A schematic diagram of an electronic device provided for an embodiment of the present application, showing a situation where no adapter is inserted;

[0037] Fig.11 A schematic diagram of an electronic device provided by an embodiment of the present application, showing a situation where an adapter is inserted;

[0038] Fig.12 A schematic diagram of a selection switch circuit provided in an embodiment of the present application;

[0039] Fig.13 A schematic diagram of a selection switch circuit provided in another embodiment of the present application. DETAILED DESCRIPTION

[0040] In order to facilitate the understanding of the present application, the present application is described in more detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that when an element is described as "fixed to" another element, it can be directly on another element or there can be one or more centered elements therebetween. When an element is described as "connected" to another element, it can be directly connected to another element or there can be one or more centered elements therebetween. The orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "bottom" and the like used in this specification is based on the orientation or positional relationship shown in the accompanying drawings, only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" and the like are used only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0041] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in this specification and in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in this specification includes any and all combinations of one or more of the related listed items.

[0042] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0043] Figure 1 Schematic diagram of a switching converter provided in an embodiment of the present application. Figure 1 As shown, the switching converter 10 includes: a first connection terminal 11 , a second connection terminal 12 , a load connection terminal 13 , a power supply node 14 , an inductor L, a switch unit SW and a control circuit 15 .

[0044] The inductor L and the switch unit SW together constitute the basic circuit topology of the switch-type converter. One end of the inductor L is connected to the first connection terminal 11, and the other end of the inductor L is connected to the power supply node 14 through the switch unit SW. The load connection terminal 13 is an electric energy output terminal. It is connected to the power supply node 14 and is used to draw electric energy from the power supply node 14. The second connection terminal 12 is an electric energy input terminal. It is connected to the power supply node 14 and is used to provide electric energy to the power supply node 14.

[0045] In some embodiments, please refer to Figure 1 The switch-mode converter may further include a first capacitor C1. One end of the first capacitor C1 is connected to one end of the inductor L and the first connection terminal 11, and the other end of the first capacitor C1 is connected to the reference ground GND. The first capacitor C1, as the capacitor of the first connection terminal, can play the role of smoothing the inductor current ripple and energy buffering.

[0046] In other embodiments, please refer to Figure 1 The switch-type converter may further include: a second capacitor C2. One end of the second capacitor C2 is connected to the power supply node 14, and the other end of the second capacitor C2 is connected to the reference ground GND. As a capacitor of the power supply node, it can help suppress voltage fluctuations of the power supply node and reduce voltage ripples.

[0047] The control circuit 15 is connected to the switch unit SW, and controls the switch unit SW in two or more control modes, and realizes voltage conversion by utilizing the energy storage and release of the inductor L. In the present application, the control modes used by the control circuit 15 include: making the switch type converter work in a buck mode and making the switch type converter work in a boost mode. For the convenience of description, they are respectively referred to as the "first control mode" and the "second control mode".

[0048] In other words, when the control circuit 15 controls the switch unit SW in the first control mode, the switch-type converter operates in the buck mode, which can reduce the input voltage to the desired output voltage. When the control circuit 15 controls the switch unit SW in the second control mode, the switch-type converter operates in the boost mode, which can increase the input voltage to the desired output voltage.

[0049] Furthermore, as the control mode used by the control circuit 15 changes, the direction of power transfer of the switching converter in different working modes will also change accordingly.

[0050] like Figure 3 As shown, in the buck mode, the second connection terminal 12 provides power to the power supply node 14. On the one hand, the power is transferred from the power supply node 14 to the first connection terminal 11 through the switch unit SW and the inductor L in sequence. On the other hand, the power supply node 14 also provides power to the load connection terminal 13.

[0051] like Figure 4 As shown, in the boost mode, while the second connection terminal 12 provides power to the power supply node 14 , the first connection terminal 11 also inputs power, which is sequentially provided to the power supply node 14 via the inductor L and the switch unit SW for the load connection terminal 13 to absorb and use.

[0052] In other words, when the switch converter operates in the buck mode, the first connection terminal 11 is a power output terminal, drawing power from the power supply node, and when the switch converter operates in the boost mode, the first connection terminal 11 is a power input terminal, providing power to the power supply node.

[0053] It can be understood that the first control mode and the second control mode are respectively applicable to different actual application scenarios of energy transfer requirements. By configuring the control circuit 15 with a preset switching judgment standard, it can switch different control modes in time according to changes in actual application scenarios to meet actual energy transfer requirements.

[0054] For example, the switching judgment standard is a standard related to the voltage of the power supply node. When the negative change of the voltage of the power supply node meets the preset standard, the control circuit 15 switches from the first control mode to the second control mode.

[0055] “Negative change” indicates that the voltage of the power supply node decreases, which is usually caused by the fact that the power supply capacity of the second connection terminal 12 cannot support or meet the power extraction requirements of the load connection terminal 13 and the first connection terminal 11 .

[0056] The "preset standard" is a standard for measuring the voltage of the power supply node. Therefore, when the negative change of the voltage of the power supply node meets the preset standard, it indicates that the power of the power supply node cannot meet the energy demand of the current load connection end.

[0057] The preset standard specifically measures negative changes in one or more different ways to determine whether the voltage of the power supply node has unexpectedly decreased, including but not limited to: the value of the decrease, the rate of decrease, and the proportion of decrease. For example, when the voltage of the power supply node decreases rapidly to a certain value at a certain rate (hereinafter referred to as a negative jump).

[0058] As mentioned above, after the control circuit 15 switches from the first control mode to the second control mode, the switching converter operates in the boost mode, so that the first connection terminal 11 is transformed into an electric energy input terminal, and together with the second connection terminal 12, it provides electric energy to the power supply node 14, thereby meeting the increased load demand of the load connection terminal 13, and ensuring the voltage stability of the power supply node 14 and the reliable operation of the functional units connected to the load connection terminal 13.

[0059] The above-mentioned switching converter realizes bidirectional transmission control of electric energy. When the voltage of the power supply node suddenly changes negatively, the control circuit can promptly switch the switching converter from the buck mode to the boost mode, so that the first connection end is transformed from the energy absorption end to the energy supply end, thereby quickly compensating for the voltage drop of the power supply node.

[0060] For example, taking the application of a switching converter in battery charge and discharge management as an example, combined with Figure 2 The specific operation process of the switching converter is described in detail.

[0061] like Figure 2 As shown, the first connection terminal 11 of the switching converter 10 is connected to the adapter 20, the second connection terminal 12 is connected to the rechargeable battery BAT, and the load connection terminal 13 is connected to the radio frequency signal amplifier PA.

[0062] When the connected adapter 20 is a power adapter with a relatively large output power (for example, a constant voltage adapter with an output voltage of 5V and an output current of 2A or more), the control circuit 15 uses the first control mode to control the switch unit SW. At this time, the switch-type converter 10 operates in the buck mode, and the adapter 20 provides power to the power supply node 14. The power of the power supply node is converted into an ideal charging voltage or charging current after passing through the switch unit SW and the inductor L in sequence, and is output from the first connection terminal 11 to charge the battery BAT. The load connection terminal 13 also draws power from the power supply node 14 to power the RF signal amplifier PA.

[0063] Due to some specific operations of the electronic device when in use (e.g., making or receiving calls, hotspot sharing, enabling related location services), the load demand of the RF signal amplifier PA may suddenly increase. At this time, the control circuit 15 will appropriately reduce the output power of the first connection terminal 11 (i.e., reduce the charging power of the battery) to ensure that the voltage of the power supply node 14 remains stable.

[0064] When the adapter 20 connected to the switching converter 10 is a power adapter with relatively low output power (for example, a constant voltage adapter with an output voltage of 5V and an output circuit of 0.5 to 1A), once the load demand of the RF signal amplifier PA suddenly increases, the voltage of the power supply node 14 will show a significant negative change (satisfying the preset standard).

[0065] At this time, the control circuit 15 switches to use the second control mode to control the switch unit SW, the switch-type converter 10 operates in the boost mode, and the direction of power transmission changes. Accordingly, the battery BAT becomes a discharge state and supplies power to the first connection terminal 11. The battery voltage of the first connection terminal 11 is successively converted to an ideal power supply voltage after passing through the inductor L and the switch unit SW, and supplies power to the power supply node 14 together with the adapter 20, so that the voltage of the power supply node remains stable.

[0066] Through the application scenario description of the above-mentioned battery charge and discharge management, the switching converter provided in the embodiment of the present application effectively improves the response capability to sudden load changes. Moreover, since the direction of power transmission is opposite when the first control mode is switched to the second control mode, the energy stored in the inductor can be transmitted continuously without waiting until the inductor energy is completely released to complete the switching, ensuring that the switching converter can smoothly complete the mode switching and improve the response speed.

[0067] In some embodiments, please refer to Figure 1 The switch unit SW includes: a first controllable switch QHS and a second controllable switch QLS.

[0068] The first end of the first controllable switch QHS is connected to one end of the inductor L, and the second end of the first controllable switch QHS is connected to the power supply node 14. The second end of the second controllable switch QLS is connected to one end of the inductor L and the first end of the first controllable switch. The second end of the second controllable switch QLS is connected to the reference ground GND.

[0069] The control ends of the first controllable switch QHS and the second controllable switch QLS are both connected to the control circuit 15. The control circuit 15 controls the conduction state of the first controllable switch QHS and the second controllable switch QLS, so that the inductor L is alternately in the energy storage state and the release state, realizing the voltage conversion function of boosting or bucking.

[0070] For example, Figure 1 The case of using a MOS tube as a controllable switch is shown in FIG. The controllable switch may also need to select a suitable device type according to specific needs, such as a SiC device, a GaN device, or a BJT transistor.

[0071] Please continue reading Figure 3 and Figure 4 When the control circuit 15 switches from the first control mode to the second control mode, the directions of the inductor currents are opposite. Such configuration of the inductor currents in opposite directions enables the inductor energy to have a continuous transmission characteristic. When the voltage of the power supply node suddenly drops and the control mode needs to be switched, the switching of the working mode can be completed without waiting for the inductor energy to be exhausted, thereby improving the responsiveness to the voltage fluctuation of the power supply node and providing more stable power supply support for the load.

[0072] In some embodiments, Figure 2 As shown, to adapt to controlling the first controllable switch QHS and the second controllable switch QLS, the control circuit 15 includes: a logic circuit 151 , a first drive circuit 152 and a second drive circuit 153 .

[0073] The logic circuit 151 is the main control circuit, which generates a corresponding pulse width modulation signal according to the selected control mode. The first drive circuit 152 and the second drive circuit 153 are drive circuits for driving the first controllable switch QHS and the second controllable switch QLS respectively.

[0074] The input end of the first driving circuit 152 is connected to the logic circuit 152, and the output end of the first driving circuit 152 is connected to the control end of the first controllable switch QHS. It is used to perform one or more signal processing such as level conversion on the received pulse width modulation signal, generate and output the corresponding first driving signal, and drive the first controllable switch QHS to turn on or off.

[0075] The input end of the second drive circuit 153 is connected to the logic circuit 151, and the output end of the second drive circuit 153 is connected to the control end of the second controllable switch QLS, which is used to perform one or more signal processing such as level conversion on the received pulse width modulation signal, generate and output the corresponding second drive signal, and drive the second controllable switch QLS to be turned on or off.

[0076] In some embodiments, the first control mode includes: controlling the switch unit SW to operate alternately in the first inductor energy storage stage S1 and the first inductor energy discharge stage S2.

[0077] like Figure 5 As shown, the first inductor energy storage stage S1 includes: keeping the second controllable switch QLS off, controlling the first controllable switch QHS to turn on. In this process, the inductor L is in the energy storage stage, and the current of the inductor will rise accordingly. When it is detected that the current of the inductor L reaches a preset peak value ( Figure 5 The first controllable switch QHS is controlled to be disconnected, so that the current of the inductor stops rising.

[0078] The first inductor energy release stage S2 includes: while keeping the first controllable switch QHS off, controlling the second controllable switch QLS to be turned on until a preset first moment T2. During this process, the inductor L is in a release stage, and the current of the inductor decreases accordingly. The first moment T2 is a phase alternation moment that is appropriately configured according to the needs of the actual situation.

[0079] After the first moment T2, the first inductive energy storage stage S1 is re-executed to enter the next switching cycle. Thus, the switching converter operates in the buck mode, and can reduce the voltage of the power supply node to an ideal voltage or current, which is output from the first connection terminal to meet the needs of practical applications (for example, providing a suitable charging current or voltage to charge the battery).

[0080] In some other embodiments, the second control mode includes controlling the switch unit SW to alternately operate in the second inductive energy discharging stage S3 and the second inductive energy storing stage S4.

[0081] like Figure 6 As shown, the second inductor energy release stage S3 includes: keeping the first controllable switch QHS off, controlling the second controllable switch QLS to be turned on. In this process, the inductor L is in the release stage, and the current of the inductor L will decrease accordingly. When it is detected that the current of the inductor L reaches a preset valley value ( Figure 6 The second controllable switch QLS is controlled to be turned off, so that the current of the inductor stops decreasing and switches to the second inductor energy storage stage S4.

[0082] The second inductor energy storage stage S4 includes: while keeping the second controllable switch QLS off, controlling the first controllable switch QHS to be turned on until a preset second moment T4. During this process, the inductor L is in the energy storage stage, and the current of the inductor L rises accordingly. The second moment T4 is a stage alternation moment that is appropriately configured according to the needs of the actual situation.

[0083] After the second moment, the second inductor energy discharge phase S3 is executed again to enter the next switching cycle. Thus, the switching converter operates in the boost mode, and after the voltage of the first connection terminal is increased to an ideal voltage, the power supply node is supplied with power, thereby meeting the needs of practical applications (for example, maintaining the voltage stability of the power supply node in the case of a sudden load change at the load connection terminal).

[0084] For details, please continue to refer to Figure 5 and Figure 6 A specific time interval is set between the aforementioned alternating inductor energy storage phase and the inductor release phase to ensure that the first controllable switch QHS and the second controllable switch QLS will not be turned on at the same time.

[0085] For example, taking the control circuit using forced pulse width modulation control (Forced Pulse Width Modulation, FPWM) as an example, combined with Figure 7 and Figure 8 The specific implementation of the control circuit is described in detail.

[0086] In the FPWM control mode, the first controllable switch QHS and the second controllable switch QLS maintain a constant switching period, and the output voltage of the switching converter is controlled only by adjusting the length of the conduction time.

[0087] like Figure 7 As shown, the control circuit 15 includes: a control unit 1511 , a trigger 1512 , a sawtooth wave generating unit 1513 , a comparator 1514 , and a loop compensation module 1515 .

[0088] The loop compensation module 1515 has multiple selectable inputs, and the selected inputs are error compensated to form a VC signal output. It uses the corresponding input based on the selected control mode. Input a corresponds to the first control mode, and collects the difference between the inductor current I_BUS and the preset reference value I_BUS_ref. Input b corresponds to the second control mode, and collects the difference between the voltage V_BUS of the power supply node and the preset reference value V_BUS_ref.

[0089] The sawtooth wave generating unit 1513 is used to generate a sawtooth wave signal with a fixed frequency (the waveform has a linear rising or falling characteristic) as a reference waveform for PWM modulation. I_HFET and I_LFET are the current sampling results of the first controllable switch and the second controllable switch, respectively, to prevent the first controllable switch and the second controllable switch from being damaged under abnormal conditions.

[0090] One of the input terminals of the comparator 1514 is connected to the output of the loop compensation module 1515, and receives the VC signal output by the loop compensation module 1515. The other input terminal of the comparator 1514 is connected to the sawtooth wave generating unit 1513. The comparator 1514 compares the received sawtooth wave signal with the error signal VC provided by the loop compensation module 1515, and outputs a corresponding PWM waveform signal according to the comparison result to control the conduction time of the controllable switch in each switching cycle.

[0091] The trigger 1512 combines the reference clock signal CLK and the output of the comparator 1514 to implement timing control of the PWM signal and ensure the fixed frequency characteristic of the PWM signal.

[0092] The control unit 1511 receives the output of the trigger 1512, processes the logical relationship of the PWM signal and provides the required driving capability, and then forms a PWM control signal to control the on and off of the first controllable switch and the second controllable switch.

[0093] Figure 8 : is a signal waveform diagram of a switching converter, wherein I_PA represents the current at the load connection terminal, VC represents the output of the loop compensation module 1515, V_BUS represents the voltage at the power supply node, SW represents the switching voltage (the voltage at the common node of the first controllable switch and the second controllable switch), I_L represents the inductor current, I_BUS represents the current at the power supply node, and I_BAT represents the current at the first connection terminal.

[0094] exist Figure 8 The loop compensation module 1515 initially selects input a as input (ie, uses the first control mode). When the voltage V_BUS of the power supply node undergoes a negative sudden change (a load sudden change occurs), the loop compensation module 1515 switches to use input b (ie, uses the second control mode).

[0095] like Figure 8As shown in the figure, when a sudden load change occurs, the inductor current I_L achieves a fast reverse from +2A to -2.5A. This conversion process is completed within 1-2 switching cycles, and the waveform is smooth without obvious oscillation. At the same time, other parameters such as the VC signal steadily decrease from 900mV to 500mV, the current I_BUS of the power supply node increases from 1.2A to 3.5A, and the current I_BAT of the first connection terminal also changes from the positive 1.2A to the negative -2.5A accordingly, indicating that the converter successfully switches from buck mode to boost mode.

[0096] In addition, the signal waveform shows that when the load suddenly changes, the voltage V_BUS of the power supply node only drops by about 0.4V (from 4.7V to 4.3V), and the relative change rate is only about 8.5%, and then it quickly recovers and stabilizes at around 4.5V. The entire recovery process is smooth, without obvious overshoot and oscillation, which fully proves that the switching converter has excellent dynamic response characteristics and stability control capabilities.

[0097] Fig. 9 This is a typical schematic diagram of an electronic device. Fig. 9 As shown, the electronic device includes: a charge and discharge manager for controlling the charge and discharge process of the battery, a battery BAT, a boost circuit, a main power management unit responsible for power supply management of various modules of the system, an audio signal amplifier for processing audio signal amplification, and a radio frequency signal amplifier and other functional modules.

[0098] Among them, the RF signal amplifier (Power Amplifier, PA) is a key component of wireless communication functions. Its main function is to amplify the modulated RF signal to a sufficient power level to ensure that the wireless signal can be effectively transmitted.

[0099] Since the RF signal amplifier has the characteristics of large load changes during operation, high requirements for instantaneous high power and stable power supply, etc. Fig. 9 As shown, a typical electronic device usually sets an additional boost circuit for the RF signal amplifier PA to perform voltage boost and voltage regulation to ensure the normal operation of the RF signal amplifier PA.

[0100] In the process of implementing the present application, the applicant discovered that: based on the switching transformer provided in the embodiment of the present application, by reusing the path switching function provided by the selection switch circuit in the electronic device, it is possible to support the normal operation of the RF signal amplifier while eliminating the additional boost circuit.

[0101] The inventive concept provided by the present application can also be generally applied to the power supply control of other types of power amplifiers and achieve the same technical effect. That is, in the case of eliminating the independently set boost circuit, it can also support the normal operation of the power amplifier or other functional circuits with similar working characteristics (large load changes during operation and high instantaneous high power requirements).

[0102] Fig.10 The electronic device provided in the embodiment of the present application. Fig.10 As shown, the electronic device 100 includes: the switching converter 10 as described above, a selection switch circuit 30 , a battery BAT and a power amplifier 60 .

[0103] The selection switch circuit 30 includes: a first input terminal 31, a second input terminal 32 and a first output terminal 33. The first output terminal 33 is connected to the power amplifier 60. It can selectively establish an electrical connection between the first input terminal 31 or the second input terminal 32 and the first output terminal 33 according to different received control signals, thereby switching the power supply mode of the power amplifier 60.

[0104] The battery BAT is connected to the first input terminal 31 of the selection switch circuit 30 for providing a battery voltage. The switch-type converter 10 is used as a charge and discharge manager in the electronic device 100, and the first connection terminal 11 of the switch-type converter 10 is connected to the battery BAT. The load connection terminal 13 of the switch-type converter is connected to the second input terminal 32 of the selection switch circuit 30.

[0105] Based on the different battery voltages provided by the battery BAT, the switch circuit 30 is selected to switch different power supply paths to supply power to the power amplifier 60 .

[0106] Please continue reading Fig.10 When the battery voltage is greater than a first preset value, the switch circuit 30 is selected to establish an electrical connection between the first input terminal 31 and the first output terminal 33, and the first power supply path P1 is used, so that the battery 30 directly powers the power amplifier 60.

[0107] After a period of use, when the battery voltage of the battery BAT decreases to a range less than or equal to the first preset value and greater than the second preset value, the selection switch circuit 30 establishes an electrical connection between the second input terminal 32 and the first output terminal 33. At this time, through the second power supply path 10, the battery voltage of the battery BAT is boosted by the switch-type converter 10 and then output from the load connection terminal of the switch-type converter 10 to power the power amplifier 60.

[0108] Specifically, the first preset value and the second preset value are values ​​configured by technicians according to actual conditions. For example, when a lithium-ion battery with a silicon-based negative electrode is used, the first preset value is set to 3V and the second preset value is set to 2.7V.

[0109] When the battery voltage of the above electronic device is sufficient, the switching circuit is selected to directly establish a power supply path from the battery to the RF amplifier, thereby avoiding additional conversion links and improving power supply efficiency. When the battery voltage decreases but is still within the usable range, it automatically switches to the load connection end of the switching converter for power supply, thereby ensuring that the RF amplifier obtains a stable operating voltage.

[0110] This power supply configuration eliminates the need for a separate boost converter for the power amplifier, significantly reducing cost and circuit area, and also ensuring the optimal power supply path under different battery voltage conditions.

[0111] In some embodiments, as the battery life increases and the battery capacity decreases, the battery voltage may further drop to a lower voltage level. In the case where the electronic device is provided with a charge pump converter, the charge pump converter may be further used to replace the switch converter 10 to boost the battery voltage provided by the battery to power the power amplifier.

[0112] For example, see Fig.10 The electronic device 100 further includes a charge pump converter 40. The charge pump converter 40 includes a plurality of switch tubes and capacitors. By controlling the on and off of the switch tubes, the capacitors are connected in series or in parallel at different phases, thereby realizing voltage conversion.

[0113] The voltage input terminal of the charge pump converter 40 is connected to the battery BAT, and the voltage doubler output terminal of the charge pump converter 40 is connected to the second input terminal 32 of the selection switch circuit 30 .

[0114] When the battery voltage further decreases to less than the second preset value, the switch circuit 30 is selected to establish an electrical connection between the second input terminal 32 and the first output terminal 33. At this time, through the third power supply path P3, the battery voltage is reversely doubled by the charge pump converter 40, and the power amplifier 60 is powered by the doubled voltage output terminal of the charge pump converter 40.

[0115] The electronic device further expands the available voltage range of the battery by using a charge pump converter, and is suitable for application in a new battery system with a wider operating voltage range.

[0116] By way of example, taking the battery BAT as a silicon-based negative electrode lithium-ion battery and the power amplifier 60 as a radio frequency signal amplifier as an example, the specific power supply method of the electronic device 100 for the power amplifier 60 is described in detail.

[0117] The battery voltage V of silicon-based negative electrode lithium-ion battery BAT Normal time (V BAT >3V), the battery voltage directly powers the RF signal amplifier PA through the first power supply path formed by the selection switch circuit 30.

[0118] The battery voltage V of silicon-based negative electrode lithium-ion battery BAT When the BAT >2.7V), battery voltage V BAT The voltage is boosted by the switch-type converter 10. The output voltage boosted by the switch-type converter 10 is used to supply power to the radio frequency signal amplifier PA through the second power supply path formed by the selection switch circuit 30.

[0119] The battery voltage V of silicon-based negative electrode lithium-ion battery BAT When the voltage is very low (2.8V>V BAT >2.2V), battery voltage V BAT After being reversely multiplied by 1:2 by the charge pump converter 40 , the voltage is output to the second input terminal 32 of the selection switch circuit 30 to power the RF signal amplifier PA.

[0120] The above embodiment describes a situation where the battery BAT is used as a single power source to power the power amplifier 60 via a plurality of different power supply paths (eg, the first power supply path P1 , the second power supply path P2 , and the third power supply path P3 ).

[0121] It is understandable that during the use of the electronic device, when the battery BAT is a rechargeable battery, such as Fig.11 As shown, there is also a scenario in which the adapter 20 is used to charge the battery BAT in the electronic device 100 .

[0122] In some embodiments, Fig.11 As shown in the power transmission path P4, the adapter 20 is connected to the second connection terminal of the switch-type converter 10 used as the charge and discharge manager. When the output power of the adapter 20 meets the current power demand, the adapter 20 charges the battery BAT through the switch-type converter 10 working in the buck mode, and also supplies power to the power amplifier 60 through the first input terminal of the selection switch circuit 30.

[0123] As described in the above embodiments, when the electronic device performs some specific operations, the load demand of the power amplifier 60 will increase suddenly. At this time, the charging power of the battery BAT is reduced, and the output power of the adapter 20 is provided to the power amplifier 60 more to ensure the operation of the power amplifier 60.

[0124] In other words, the power supply of the power amplifier 60 has a higher power supply priority than the charging of the battery BAT. Furthermore, when the output power of the adapter 20 connected to the electronic device 100 is small (for example, the specifications of the connected adapter 20 are low and the upper limit of the output power that can be provided is low), and it cannot meet the charging of the battery BAT and the sudden increase in the load demand of the power amplifier 60 (that is, the output power of the adapter 20 cannot meet the current power demand), as Fig.11 As shown in the power transmission path P5, the switching converter 10 switches to the boost mode and the battery BAT is in the discharge state. At this time, the battery BAT and the adapter 20 jointly supply power to the power amplifier 60 through the second input terminal of the selection switch circuit 30 to ensure the operation of the power amplifier 60.

[0125] The specific control formula of the switching mode of the switching converter 10 is the same as that described in the above embodiment, and the relevant contents of the above embodiment may be referred to, and will not be repeated here.

[0126] In some embodiments, please refer to Fig.10 The electronic device 100 further includes a power load unit 50. The selection switch circuit 30 is a path switching unit that drives the power load unit 50 of the electronic device to work in different modes, and further includes a second output terminal 34 connected to the power load unit.

[0127] When the selection switch circuit 30 establishes an electrical connection between the first input terminal 31 and the second output terminal 34, the driving power load unit 50 operates in the first mode, and when the selection switch circuit 20 switches to establish an electrical connection between the second input terminal 32 and the second output terminal 34, the driving power load unit 50 operates in the second mode.

[0128] Specifically, the power load unit 50 is a device or circuit unit configured in an electronic device and capable of receiving and consuming electric energy, and has at least two working modes with different electric energy requirements, including but not limited to light emitting elements.

[0129] For example, the electronic device is a smartphone with a camera function, and the power load unit 50 is an LED unit. The first mode of the LED unit corresponds to the fill light / flashlight function of the smartphone, which is used for lighting or fill light when shooting a video, and the second mode of the LED unit corresponds to the flash function of the smartphone when shooting.

[0130] Fig.12 Schematic diagram of a selection switch circuit provided in an embodiment of the present application. Fig.12 As shown, the selection switch circuit includes: a first MOS tube M1, a second MOS tube M2, a third MOS tube M3 and a fourth MOS tube M4.

[0131] The source of the first MOS tube M1 is connected to the drain of the second MOS tube M2, the drain of the first MOS tube M1 is connected to the second input terminal 32, and the source of the second MOS tube M2 is connected to the second output terminal 34. The source of the third MOS tube M3 is connected to the drain of the fourth MOS tube M4, the drain of the third MOS tube M3 is connected to the first input terminal 31, and the source of the fourth MOS tube M4 is connected to the first output terminal 33.

[0132] The first MOS tube M1 and the third MOS tube M3 have a higher withstand voltage than the second MOS tube M2 and the fourth MOS tube M4. The second MOS tube M2 and the fourth MOS tube M4 can work in a constant current mode, and the current can be controlled by the second MOS tube M2 and the fourth MOS tube M4.

[0133] Thus, the first output terminal 33 and the second output terminal 34 of the selection switch circuit 30 both form two power transmission channels, which can be used to drive the LED unit to work in the first mode and the second mode respectively.

[0134] Taking the first output terminal 33 as an example, when the LED unit works in the first mode, since the first mode provides continuous and stable low-power lighting, the required current and power are relatively small. Therefore, the switch circuit 30 is selected to use the first power transmission channel, and the third MOS tube M3 and the fourth MOS tube M4 are selected to be turned on, and the first input terminal 31 is used to power the LED unit 50.

[0135] When the LED unit works in the second mode, since the second mode provides instantaneous high-brightness flash, the required current and instantaneous power are relatively high. Therefore, the selection switch circuit 30 selects to turn on the first MOS tube M1 and the fourth MOS tube M4 through the second power transmission channel, and the second input terminal 32 supplies power to the LED unit to meet the high power demand of the LED unit.

[0136] exist Fig.12 In the selection switch circuit shown, the first output terminal 33 or the second output terminal 34 can be connected to the LED unit. The selection switch circuit 30 can drive the LED unit connected to the first output terminal 33 or the second output terminal 34 to operate in the first mode or the second mode.

[0137] In some embodiments, Fig.12 Based on the specific implementation of the selection switch circuit shown, it can be appropriately adjusted to obtain the advantages of reducing the occupied MOS tube area and path impedance, etc. by sacrificing some functions.

[0138] like Fig.13As shown, the selection switch circuit includes: a third controllable switch M5, a fourth controllable switch M6 and a fifth controllable switch M7. The withstand voltage level of the third controllable switch M5 and the fourth controllable switch M6 is higher than that of the fifth controllable switch M7. The third controllable switch M5, the fourth controllable switch M6 and the fifth controllable switch M7 can work in a constant current mode.

[0139] Among them, the first end of the third controllable switch M5 is connected to the first input end 31, and the second end of the third controllable switch M5 is connected to the first end of the fifth controllable switch M7; the first end of the fourth controllable switch M6 is connected to the second input end 32, and the second end of the fourth controllable switch M6 is connected to the first end of the fifth controllable switch M7; the second end of the fourth controllable switch M4 is also connected to the first output end 33; the second end of the fifth controllable switch M7 is connected to the second output end 34.

[0140] For example, Fig.13 The case of using MOS tube as a controllable switch is shown in FIG.

[0141] Relative to Fig.12 For the selection switch circuit shown, Fig.13 The function of the first connection terminal 33 of the selection switch circuit shown as being able to be connected to the LED unit is sacrificed, and the first connection terminal 33 is connected to the power amplifier 60 for supplying power to the power amplifier 60 .

[0142] Such a selection switch circuit arrangement can also meet the need to switch the power supply path of the power amplifier 60 under different battery voltages. Moreover, it uses a smaller number of controllable switches, saving the chip area required, which is conducive to the application in portable electronic devices.

[0143] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Under the concept of the present application, the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other changes in different aspects of the present application as described above, which are not provided in detail for the sake of simplicity. Although the present application has been described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some of the technical features can be replaced by equivalents. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A switching converter, characterized in that: include: A first connection terminal, a second connection terminal, a load connection terminal, a power supply node, an inductor, a switch unit, and a control circuit; One end of the inductor is connected to the first connection end, and the other end of the inductor is connected to the power supply node through the switch unit; The load connection end is connected to the power supply node and is used to draw electric energy from the power supply node; The second connection end is connected to the power supply node and is used to provide power to the power supply node; The control circuit is connected to the switch unit and controls the switch unit in a first control mode or a second control mode; Wherein, in the first control mode, the switching converter operates in a buck mode, and the first connection end draws electrical energy from the power supply node; In the second control mode, the switch-type converter operates in a boost mode, and the first connection end provides electrical energy to the power supply node; When a negative change in the voltage of the power supply node meets a preset standard, the control circuit switches from the first control mode to the second control mode.

2. The switching converter according to claim 1, characterized in that The switch unit comprises: a first controllable switch and a second controllable switch; Wherein, a first end of the first controllable switch is connected to one end of the inductor, a second end of the first controllable switch is connected to the power supply node, and a control end of the first controllable switch is connected to the control circuit; The second end of the second controllable switch is connected to one end of the inductor and the first end of the first controllable switch; the second end of the second controllable switch is connected to a reference ground, and the control end of the second controllable switch is connected to the control circuit.

3. The switching converter according to claim 2, characterized in that: The first control mode includes: controlling the switch unit to operate alternately in a first inductor energy storage stage and a first inductor energy discharge stage; Wherein, the first inductive energy storage stage includes: Keeping the second controllable switch off and controlling the first controllable switch to be on; When the current of the inductor reaches a preset peak value, controlling the first controllable switch to be disconnected; The first inductor energy discharging stage includes: The first controllable switch is kept disconnected, and the second controllable switch is controlled to be turned on until a preset first moment.

4. The switching converter according to claim 2, characterized in that: The second control mode includes: controlling the switch unit to operate alternately in a second inductor energy discharging stage and a second inductor energy storing stage; Wherein, the second inductor energy release stage includes: Keeping the first controllable switch off, and controlling the second controllable switch to be on; When the current of the inductor drops to a preset valley value, controlling the second controllable switch to be disconnected; The second inductive energy storage stage includes: The second controllable switch is kept disconnected, and the first controllable switch is controlled to be turned on until a preset second moment.

5. The switching converter according to claim 2, characterized in that: The control circuit comprises: A logic circuit, the logic circuit is used to: generate a corresponding pulse width modulation signal according to the first control mode or the second control mode; a first drive circuit, wherein an input end of the first drive circuit is connected to the logic circuit, an output end of the first drive circuit is connected to a control end of the first controllable switch, and the first drive circuit is used to: generate a corresponding first drive signal according to a received pulse width modulation signal to drive the first controllable switch to be turned on or off; A second drive circuit, wherein the input end of the second drive circuit is connected to the logic circuit, the output end of the second drive circuit is connected to the control end of the second controllable switch, and the second drive circuit is used to: generate a corresponding second drive signal according to the received pulse width modulation signal to drive the second controllable switch to be turned on or off.

6. The switching converter according to any one of claims 2 to 5, characterized in that: Also includes: a first capacitor and a second capacitor; Among them, one end of the first capacitor is connected to the first connection end, and the other end of the first capacitor is connected to the reference ground; one end of the second capacitor is connected to the power supply node, and the other end of the second capacitor is connected to the reference ground.

7. An electronic device, characterized in that: include: A selection switch circuit, the selection switch circuit comprising: a first input terminal, a second input terminal and a first output terminal; a battery, the battery being connected to the first input terminal and being used to provide a battery voltage; The switching converter according to any one of claims 1 to 6, wherein the first connection terminal of the switching converter is connected to the battery, and the load connection terminal of the switching converter is connected to the second input terminal; A power amplifier; the power amplifier is connected to the first output terminal; Wherein, when the battery voltage is greater than a first preset value, the selection switch circuit establishes an electrical connection between the first input terminal and the first output terminal, and the battery supplies power to the power amplifier; When the battery voltage is less than or equal to the first preset value and greater than a second preset value, the selection switch circuit establishes an electrical connection between the second input terminal and the first output terminal, and the load connection terminal of the switching converter supplies power to the power amplifier.

8. The electronic device according to claim 7, characterized in that: Also includes: Charge pump converter; Wherein, the charge pump converter comprises: a voltage input terminal connected to the battery and a voltage doubler output terminal connected to the second input terminal; When the battery voltage is less than or equal to the second preset value, the selection switch circuit establishes an electrical connection between the second input terminal and the first output terminal, and the voltage doubler output terminal of the charge pump converter supplies power to the power amplifier.

9. The electronic device according to claim 7, characterized in that: The electronic device further comprises: a power load unit; the selection switch circuit further comprises: a second output terminal connected to the power load unit; Wherein, when the first input terminal is electrically connected to the second output terminal, the power load unit is driven to operate in the first mode; When the second input terminal is electrically connected to the second output terminal, the power load unit is driven to operate in a second mode.

10. The electronic device according to claim 9, characterized in that: The selection switch circuit includes: a third controllable switch, a fourth controllable switch and a fifth controllable switch; Wherein, a first end of the third controllable switch is connected to the first input end, and a second end of the third controllable switch is connected to a first end of the fifth controllable switch; The first end of the fourth controllable switch is connected to the second input end, and the second end of the fourth controllable switch is connected to the first end of the fifth controllable switch; the second end of the fourth controllable switch is also connected to the first output end; The second end of the fifth controllable switch is connected to the second output end.

11. An electronic device, characterized in that: include: A selection switch circuit, the selection switch circuit comprising: a first input terminal, a second input terminal and a first output terminal; a battery, the battery being connected to the first input terminal and being used to provide a battery voltage; The switching converter according to any one of claims 1 to 6, wherein the first connection terminal of the switching converter is connected to the battery, and the load connection terminal of the switching converter is connected to the second input terminal; a power amplifier connected to the first output terminal; and an adapter connected to the second connection terminal of the switching converter; Wherein, when the output power of the adapter meets the current power demand, the selection switch circuit establishes an electrical connection between the first input end and the first output end, and the adapter supplies power to the power amplifier; When the output power of the adapter does not meet the current power demand, the selection switch circuit establishes an electrical connection between the second input terminal and the first output terminal, and the adapter and the battery jointly power the power amplifier.

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