Voltage conversion circuit and electronic device

Abstract

The application discloses a voltage conversion circuit and electronic equipment, and belongs to the technical field of electronic circuits. The voltage conversion circuit comprises a first power supply circuit, a second power supply circuit, a sampling circuit, a comparison circuit and an enable control circuit. The peak efficiency of the first power supply circuit and the peak efficiency of the second power supply circuit correspond to different working currents. The power supply ends of the first power supply circuit and the second power supply circuit are respectively connected with power supply sources, and the output ends of the first power supply circuit and the second power supply circuit are respectively connected with loads. The sampling circuit is arranged between the load and the comparison circuit. The comparison circuit is connected with the sampling circuit and the enable control circuit, and is used for outputting a high level or a low level after comparing a sampling voltage with a reference voltage. The first end of the enable control circuit is connected with the enable end of the first power supply circuit, the second end of the enable control circuit is connected with the enable end of the second power supply circuit, and the enable control circuit is used for controlling one of the first power supply circuit and the second power supply circuit to be in a working state according to the high level or the low level.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of electronic circuits, and particularly relates to a voltage conversion circuit and an electronic device. BACKGROUND

[0002] The DCDC switching power supply is a switching power supply circuit for converting a specific range of direct current voltage into a specific direct current voltage. The DCDC power supply circuit is one of the most commonly used power supply circuits in a mobile phone.

[0003] With the increasing demand for energy saving of electronic devices, the efficiency control of the DCDC becomes an important link. When the output current of the DCDC power supply circuit becomes large, the conduction loss of each device in the circuit increases, and the efficiency decreases. When the output current becomes small, the static loss and the switching loss do not change, so the proportion of the loss part will become larger, and the efficiency will also decrease accordingly. That is, the DCDC power supply circuit cannot always be in the optimal conversion efficiency. SUMMARY

[0004] The purpose of the embodiments of the application is to provide a voltage conversion circuit and an efficiency control method, device and electronic device thereof, which can solve the problem of low voltage conversion efficiency of the existing power supply circuit.

[0005] In a first aspect, the embodiments of the application provide a voltage conversion circuit, which comprises a first power supply circuit, a second power supply circuit, a sampling circuit, a comparison circuit and an enable control circuit. The peak efficiency of the first power supply circuit and the peak efficiency of the second power supply circuit correspond to different working currents. The power supply end of the first power supply circuit and the power supply end of the second power supply circuit are respectively connected to a power supply. The output end of the first power supply circuit and the output end of the second power supply circuit are respectively connected to a load. The sampling circuit is arranged between the load and the comparison circuit, and is used for collecting a sampling voltage. The input end of the comparison circuit is connected to the output end of the sampling circuit, the output end of the comparison circuit is connected to the enable control circuit, and the comparison circuit is used for outputting a high level or a low level after comparing the sampling voltage with a reference voltage. The first end of the enable control circuit is connected to the enable end of the first power supply circuit, the second end of the enable control circuit is connected to the enable end of the second power supply circuit, and the enable control circuit is used for controlling one of the first power supply circuit and the second power supply circuit to be in a working state according to the high level or the low level.

[0006] In a second aspect, the embodiments of the application provide an electronic device, which comprises a voltage conversion circuit. The voltage conversion circuit is the voltage conversion circuit as described in the first aspect.

[0007] In the embodiment of the present application, the voltage of the load is collected by the sampling circuit, and the collected voltage is compared with the reference voltage by the comparison circuit to output a high level or a low level to control the enable control circuit to output an enable signal, and the first power supply circuit or the second power supply circuit is controlled to supply power to the load through the enable signal. The working current of the load in different scenarios can be selected to select the corresponding power supply circuit with high conversion efficiency to work, thereby improving the overall conversion efficiency of the voltage conversion circuit. BRIEF DESCRIPTION OF DRAWINGS

[0008] Figure 1 is a voltage conversion circuit provided by the embodiment of the present application;

[0009] Figure 2 is another voltage conversion circuit provided by the embodiment of the present application;

[0010] Figure 3 is still another voltage conversion circuit provided by the embodiment of the present application;

[0011] Figure 4 is a voltage conversion efficiency curve provided by the embodiment of the present application;

[0012] Figure 5 is a structural schematic diagram of an electronic device provided by the embodiment of the present application;

[0013] Figure 6 is a hardware structural schematic diagram of an electronic device provided by the embodiment of the present application. DETAILED DESCRIPTION

[0014] The technical solutions in the embodiments of the present application will be described in detail below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art belong to the scope of protection of the present application.

[0015] The terms "first", "second", and the like in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are usually a class, not limited to the number of objects, for example, the first object can be one or more. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / ", generally represents that the front and rear associated objects are in an "or" relationship.

[0016] A voltage conversion circuit provided by the embodiment of the present application will be described in detail below with reference to the drawings and specific embodiments and their application scenarios.

[0017] Reference Figure 1 The embodiment provides a voltage conversion circuit, which comprises a first power supply circuit 101, a second power supply circuit 102, a sampling circuit 103, a comparison circuit 104 and an enable control circuit 105, wherein peak efficiencies of the first power supply circuit 101 and the second power supply circuit 102 correspond to different working currents. The peak efficiency is a working current when the voltage conversion circuit is in the optimal conversion efficiency, for example, the working current is 10-30 mA when the first power supply circuit 101 is in the optimal conversion efficiency, and the working current is 400-500 mA when the second power supply circuit 102 is in the optimal conversion efficiency.

[0018] It should be noted that the power supply circuit in the embodiment can comprise multiple power supply circuits, for example, according to the specific range of the working current of the load, the first power supply circuit, the second power supply circuit, the third power supply circuit and the fourth power supply circuit can be arranged.

[0019] In the embodiment, the power supply end of the first power supply circuit 101 and the power supply end of the second power supply circuit 102 are respectively connected to a power supply, for converting the power supply into different voltage values, respectively, the output end of the first power supply circuit and the output end of the second power supply circuit are respectively connected to a load, forming a circuit composed of the power supply, the first power supply circuit and the load, so that the first power supply circuit provides the first voltage value for the load through the output end, and supplies power for the load. And another circuit composed of the power supply, the second power supply circuit and the load, so that the second power supply circuit provides the second voltage value for the load through the output end, and supplies power for the load.

[0020] Specifically, the sampling circuit 103 is arranged between the load and the comparison circuit, for collecting the sampling voltage.

[0021] In an example, the sampling circuit 103 can directly collect the current or voltage of the input end of the load, such as detecting the sampling voltage by a universal meter; or the sampling voltage can be collected by the sampling circuit. Since the voltage of the load is not fixed, in order to improve the accuracy of the collected sampling voltage, the sampling voltage is obtained by the sampling circuit in the embodiment, and the collected voltage is amplified to a normal working voltage size, so as to improve the accuracy of the collected sampling voltage.

[0022] In the embodiment, the input end of the comparison circuit 104 is connected to the output end of the sampling circuit, the output end of the comparison circuit 104 is connected to the enable control circuit, and the comparison circuit 104 is used for outputting a high level or a low level after comparing the sampling voltage and the reference voltage, for example, outputting a high level when the sampling voltage is greater than the reference voltage, and outputting a low level when the sampling voltage is less than the reference voltage.

[0023] Specifically, when the load is working, the load can be powered by one of the power supply circuits, therefore, in order to avoid the first power supply circuit and the second power supply circuit working at the same time, the embodiment sets an enable control circuit for enabling one of the first power supply circuit and the second power supply circuit to power the load.

[0024] In the embodiment, the first end of the enable control circuit 105 is connected to the enable end of the first power supply circuit, the second end of the enable control circuit is connected to the enable end of the second power supply circuit, and the enable control circuit is used for controlling one of the first power supply circuit and the second power supply circuit to be in the working state according to the high level or the low level.

[0025] In one example, the working current of the first power supply circuit in the case of peak efficiency is the first current, the working current of the second power supply circuit in the case of peak efficiency is the second current, the first current is less than the second current, the sampling voltage corresponding to the first current is the first voltage, the sampling voltage corresponding to the second current is the second voltage, the reference voltage is greater than the first voltage and less than the second voltage, when the voltage collected by the sampling circuit is the first voltage, the comparison circuit outputs the low level, due to the inverting effect of the enable control circuit, the enable control circuit outputs the high level to the first power supply circuit, the first power supply circuit is turned on, the enable control circuit outputs the low level to the second power supply circuit, the second power supply circuit is closed, and the load is powered by the first power supply circuit.

[0026] The sampling circuit 103 of the embodiment includes a sampling resistor 107 and a differential amplifier 106, the first end of the sampling resistor 107 is connected to the load, and the second end of the sampling resistor 107 is connected to the output end of the first power supply circuit and the output end of the second power supply circuit. That is, the sampling resistor is arranged between the power supply circuit and the load, and is used for obtaining the load current according to the voltage difference between the two ends of the sampling resistor. According to the current equal to the ratio of the voltage to the resistance, when the resistance value of the sampling resistor is fixed, the current flowing through the sampling resistor, that is, the load current, can be obtained by collecting the voltage between the two ends of the sampling resistor.

[0027] In the embodiment, the output end of the differential amplifier 106 is connected to the input end of the comparison circuit 104, and is used for outputting the amplified sampling voltage, the positive input end of the differential amplifier is connected to the first end of the sampling resistor, and the negative input end of the differential amplifier is connected to the second end of the sampling resistor. The differential amplifier is used for amplifying the collected voltage of the sampling resistor to a suitable voltage range, so as to facilitate the comparison of the voltage.

[0028] Reference Figure 2In the embodiment, the comparison circuit 104 includes a comparator U, a first input terminal of the comparator U is connected to an output terminal of the sampling circuit, for receiving the amplified sampling voltage output by the voltage processing circuit, a second input terminal of the comparator U is a reference voltage input terminal, for providing a reference voltage, and an output terminal of the comparator U is connected to the enable control circuit 105, for outputting a comparison result of the amplified sampling voltage and the reference voltage.

[0029] Specifically, when the amplified sampling voltage is less than the reference voltage, the amplifier outputs a low level, and when the amplified sampling voltage is greater than the reference voltage, the amplifier outputs a high level.

[0030] In the embodiment, the enable control circuit includes an inverter, an output terminal and an input terminal of the inverter are connected to an enable terminal of the first power supply circuit and an enable terminal of the second power supply circuit respectively, and the inverter is used to output an enable signal opposite to the input terminal of the inverter to the enable terminal of the first power supply circuit or the enable terminal of the second power supply circuit. The inverter includes a triode inverter or a CMOS inverter, for outputting a low level from the output terminal of the inverter when the input terminal of the inverter is a high level, and outputting a high level from the output terminal of the inverter when the input terminal of the inverter is a low level.

[0031] Reference Figure 3 In the embodiment, the comparison circuit can further include an NMOS tube. When the comparison circuit includes the comparator U as shown in Figure 2 , the comparator U can directly output a high level or a low level according to the size of the sampling voltage and the reference voltage. When the comparison circuit includes the NMOS tube as shown in Figure 3 , the NMOS tube is turned on and turned off by the relationship between the voltage of the control terminal and the turn-on voltage, and the structures of the two are different, so there are different circuit structures.

[0032] Specifically, reference Figure 2 In the case that the comparison circuit includes the comparator, and the working current of the first power supply circuit at the peak efficiency is less than the working current of the second power supply circuit at the peak efficiency, the input terminal of the inverter is connected to the output terminal of the comparator, and the output terminal of the inverter is connected to the enable terminal of the first power supply circuit.

[0033] At this time, the working principle is: the comparator compares the sampling voltage with the reference voltage, and if the sampling voltage is less than the reference voltage, the comparator outputs low level, and the input end of the inverter is also low level, and the output end of the inverter is high level due to the inverting action of the inverter, that is, the enable end of the first power supply circuit is high level, and the first power supply circuit drives the load to be powered, and since the output end of the comparator is connected to the second power supply circuit, the enable end of the second power supply circuit is low level, and the second power supply circuit is closed. Conversely, if the sampling voltage is greater than the reference voltage, the comparator outputs high level, and the input end of the inverter is also high level, and the output end of the inverter is low level due to the inverting action of the inverter, and the first power supply circuit is closed, and the second power supply circuit powers the load, so that the power supply circuit with higher conversion efficiency can be selected to power the load according to the size of the load current, and the conversion efficiency of the circuit is improved.

[0034] Reference Figure 3 When the comparison circuit includes an NMOS tube, the control end of the NMOS tube is connected to the output end of the sampling circuit, the drain of the NMOS tube is connected to the pull-up power supply and the input end of the enable control circuit, and the source of the NMOS tube is grounded. At this time, the enable control circuit includes a transistor inverter, the input end of the transistor inverter is connected to the drain of the NMOS tube, and the output end of the transistor inverter is connected to the enable end of the second power supply circuit. In this embodiment, the on voltage of the NMOS tube is the reference voltage, and the calculation method of the value range of the reference voltage can be: assuming that the current value corresponding to the first power supply circuit in the peak efficiency is the first current, the current value corresponding to the second power supply circuit in the peak efficiency is the second current, the product of the sampling resistor and the first current is the first voltage, and the product of the sampling resistor and the second current is the second voltage, and the reference voltage can be a value between the first voltage and the second voltage.

[0035] At this time, the working principle is: when the sampling voltage received at the control end of the NMOS tube is less than the reference voltage, the NMOS tube is cut off, and the enable end of the first power supply circuit and the input end of the inverter are both high level due to the existence of the pull-up voltage, and the output end of the inverter is low level, at this time, the load is powered through the first power supply circuit, and the second power supply circuit is closed. When the sampling voltage is greater than the reference voltage, the NMOS tube is connected to ground, the enable end of the first power supply circuit and the input end of the inverter are both low level, and the output end of the inverter is high level, at this time, the load is powered through the second power supply circuit, and the first power supply circuit is closed. Thus, the power supply circuit with higher conversion efficiency can be selected to power the load according to the size of the sampling voltage.

[0036] Specifically, reference Figure 4 , Figure 4A voltage conversion efficiency curve provided for the embodiment is shown in FIG. 1, in which the horizontal axis represents working current, and the vertical axis represents power conversion efficiency. Curve 1 is a conversion efficiency curve of the first power supply circuit, curve 2 is a conversion efficiency curve of the second power supply circuit, and curve 3 is a conversion efficiency curve of the combination of the first power supply circuit and the second power supply circuit in the embodiment. As can be seen from FIG. 1, curve 1 has the optimal conversion efficiency at 0.1 A, curve 2 has the optimal conversion efficiency at 1.5 A, and the overall conversion efficiency of curve 3 is greater than the conversion efficiencies of curves 1 and 2. Figure 4 As can be seen from FIG. 1, curve 1 has the optimal conversion efficiency at 0.1 A, curve 2 has the optimal conversion efficiency at 1.5 A, and the overall conversion efficiency of curve 3 is greater than the conversion efficiencies of curves 1 and 2.

[0037] In the embodiment, the voltage of the load is collected by the sampling circuit, and the collected voltage is compared with the reference voltage by the comparison circuit, and a high level or a low level is outputted to control the enable control circuit to output an enable signal, and the first power supply circuit or the second power supply circuit is controlled to supply power to the load through the enable signal. The working current of the load in different scenarios can be selected to select the power supply circuit with higher conversion efficiency to work, so as to improve the overall conversion efficiency of the voltage conversion circuit.

[0038] Reference Figure 5 The embodiment provides an electronic device 500, which comprises a voltage conversion circuit 501.

[0039] The voltage conversion circuit can be any one of the voltage conversion circuits shown in Figure 1 or Figure 2 or Figure 3 The voltage conversion circuit 501 comprises a first power supply circuit, a second power supply circuit, a sampling circuit, a comparison circuit, and an enable control circuit. The peak efficiency of the first power supply circuit and the peak efficiency of the second power supply circuit correspond to different working currents. The power supply end of the first power supply circuit and the power supply end of the second power supply circuit are respectively connected to a power supply. The output end of the first power supply circuit and the output end of the second power supply circuit are respectively connected to a load. The sampling circuit is arranged between the load and the comparison circuit, and is used to collect a sampling voltage. The input end of the comparison circuit is connected to the output end of the sampling circuit, and the output end of the comparison circuit is connected to the enable control circuit. The comparison circuit is used to output a high level or a low level after comparing the sampling voltage with a reference voltage. The first end of the enable control circuit is connected to the enable end of the first power supply circuit, and the second end of the enable control circuit is connected to the enable end of the second power supply circuit. The enable control circuit is used to control one of the first power supply circuit and the second power supply circuit to be in a working state according to the high level or the low level.

[0040] The electronic device can select the power supply circuit with higher conversion efficiency to work according to the working current of the load in different scenarios, so as to improve the overall conversion efficiency of the voltage conversion circuit.

[0041] The electronic device can be a component in an electronic device, such as an integrated circuit or chip. The electronic device can be a terminal or other device other than a terminal. For example, the electronic device can be a mobile phone, a tablet computer, a notebook computer, a palm computer, a vehicle-mounted electronic device, a mobile Internet device (MID), an augmented reality (AR) / virtual reality (VR) device, a robot, a wearable device, an ultra-mobile personal computer (UMPC), a netbook, or a personal digital assistant (PDA), and the like, and can also be a server, a network attached storage (NAS), a personal computer (PC), a television (TV), a cash register, or a self-service machine, and the like, and the embodiments of the present application are not limited thereto.

[0042] Figure 6 A hardware structure schematic diagram of an electronic device according to an embodiment of the present application is shown in FIG. 10.

[0043] The electronic device 1000 includes, but is not limited to, a radio frequency unit 1001, a network module 1002, an audio output unit 1003, an input unit 1004, a sensor 1005, a display unit 1006, a user input unit 1007, an interface unit 1008, a memory 1009, and a processor 1010, and the like.

[0044] Those skilled in the art can understand that the electronic device 1000 can also include a power supply (such as a battery) for supplying power to each component, and the power supply can be logically connected to the processor 1010 through a power management system, so as to realize functions such as management of charging, discharging, and power consumption management through the power management system. Figure 6 The electronic device structure shown in FIG. 10 does not constitute a limitation on the electronic device, and the electronic device can include more or fewer components than shown, or combine certain components, or different component arrangements, which are not described herein.

[0045] The processor 1010 is connected with the voltage conversion circuit 501, and the voltage conversion circuit 501 comprises a first power supply circuit, a second power supply circuit, a sampling circuit, a comparison circuit and an enable control circuit, wherein the peak efficiency of the first power supply circuit and the peak efficiency of the second power supply circuit correspond to different working currents; the power supply end of the first power supply circuit and the power supply end of the second power supply circuit are respectively connected with a power supply; the output end of the first power supply circuit and the output end of the second power supply circuit are respectively connected with a load; the sampling circuit is arranged between the load and the comparison circuit, and is used for collecting a sampling voltage; the input end of the comparison circuit is connected with the output end of the sampling circuit, the output end of the comparison circuit is connected with the enable control circuit, and the comparison circuit is used for outputting a high level or a low level after comparing the sampling voltage with a reference voltage; the first end of the enable control circuit is connected with the enable end of the first power supply circuit, the second end of the enable control circuit is connected with the enable end of the second power supply circuit, and the enable control circuit is used for controlling one of the first power supply circuit and the second power supply circuit to be in a working state according to the high level or the low level.

[0046] The electronic device can select a power supply circuit with higher conversion efficiency according to the working current of the load in different scenes, so as to improve the overall conversion efficiency of the voltage conversion circuit.

[0047] It should be understood that in the embodiments of the present application, the input unit 1004 can include a graphics processor (GPU) 10041 and a microphone 10042. The graphics processor 10041 processes image data of a still picture or a video obtained by an image capture device (such as a camera) in a video capture mode or an image capture mode. The display unit 1006 can include a display panel 10061, which can be configured in the form of a liquid crystal display, an organic light-emitting diode, etc. The user input unit 1007 includes at least one of a touch panel 10071 and other input devices 10072. The touch panel 10071 is also called a touch screen. The touch panel 10071 can include a touch detection device and a touch controller. The other input devices 10072 can include, but are not limited to, a physical keyboard, function keys (such as volume control keys, on-off keys, etc.), trackballs, mice, joysticks, and the like, which will not be described here.

[0048] The memory 1009 can be used to store software programs and various data. The memory 1009 can mainly include a first storage area storing programs or instructions and a second storage area storing data, wherein the first storage area can store an operating system, application programs or instructions required by at least one function (such as a sound playing function, an image playing function, etc.), and the like. In addition, the memory 1009 can include a volatile memory or a non-volatile memory, or the memory 1009 can include both volatile and non-volatile memories. The non-volatile memory can be a Read-Only Memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an Electrically EPROM (EEPROM), or a flash memory. The volatile memory can be a Random Access Memory (RAM), a Static RAM (SRAM), a Dynamic RAM (DRAM), a Synchronous DRAM (SDRAM), a Double Data Rate SDRAM (DDR SDRAM), an Enhanced SDRAM (ESDRAM), a Synch link DRAM (SLDRAM), and a Direct Rambus RAM (DRRAM). The memory 1009 in the embodiments of the present application includes but is not limited to these and any other suitable types of memory.

[0049] The processor 1010 can include one or more processing units; optionally, the processor 1010 integrates an application processor and a modem processor, wherein the application processor mainly processes operations related to an operating system, a user interface, and an application program, and the modem processor mainly processes wireless communication signals, such as a baseband processor. It can be understood that the above-mentioned modem processor can also not be integrated into the processor 1010.

[0050] The embodiments of the present application further provide a chip, which is provided with the voltage conversion circuit provided by the embodiments and can achieve the same technical effects of the voltage conversion circuit. To avoid repetition, details are not described here.

[0051] It should be understood that the chip mentioned in the embodiments of the present application can also be referred to as a system-level chip, a system chip, a chip system, or a system-on-chip chip, etc.

[0052] It should be noted that, as used in this application, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises... a" does not, without more constraints, exclude the presence of additional identical elements in the process, method, article, or apparatus that comprises the element. Furthermore, it should be noted that the methods and apparatuses of the present application are not limited by the order of the steps or the sequence for performing the steps, as some steps can occur simultaneously, be performed in different orders, or be performed concurrently, unless expressly by the context required otherwise. Also, features described with respect to certain examples can be combined in other examples.

[0053] From the above description of the embodiments, it is apparent that the method of the above-described embodiments can be realized by software plus necessary universal hardware platform, and of course, can also be realized by hardware, but in many cases, the former is a better embodiment. Based on such understanding, the technical solutions of the present application can be embodied in the form of a computer software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, or optical disk) and includes a plurality of instructions for causing a terminal (which can be a mobile phone, computer, server, or network device) to execute the methods described in the various embodiments of the present application.

[0054] The embodiments of the present application are described above in conjunction with the drawings, but the present application is not limited to the above-described specific embodiments, and the above-described specific embodiments are merely illustrative rather than limiting, and a person of ordinary skill in the art can make many forms under the inspiration of the present application without departing from the scope of the present application and the scope of protection of the claims.

Claims

1. A voltage conversion circuit, characterized by, The voltage conversion circuit comprises a first power supply circuit, a second power supply circuit, a sampling circuit, a comparison circuit and an enable control circuit, wherein a working current corresponding to a peak efficiency of the first power supply circuit is a first current, a working current corresponding to a peak efficiency of the second power supply circuit is a second current, and the first current and the second current are different; A power supply end of the first power supply circuit and a power supply end of the second power supply circuit are respectively connected to a power supply, and an output end of the first power supply circuit and an output end of the second power supply circuit are respectively connected to a load; The sampling circuit is arranged between the load and the comparison circuit, and is used for collecting a sampling voltage; An input end of the comparison circuit is connected to an output end of the sampling circuit, an output end of the comparison circuit is connected to the enable control circuit, and the comparison circuit is used for outputting a high level or a low level after comparing the sampling voltage and a reference voltage; A first end of the enable control circuit is connected to an enable end of the first power supply circuit, a second end of the enable control circuit is connected to an enable end of the second power supply circuit, and the enable control circuit is used for controlling one of the first power supply circuit and the second power supply circuit to be in a working state according to the high level or the low level; The sampling circuit comprises a sampling resistor and a differential amplifier, a first end of the sampling resistor is connected to the load, and a second end of the sampling resistor is connected to the output end of the first power supply circuit and the output end of the second power supply circuit; An output end of the differential amplifier is connected to the input end of the comparison circuit, a positive input end of the differential amplifier is connected to the first end of the sampling resistor, and a negative input end of the differential amplifier is connected to the second end of the sampling resistor; The reference voltage is a value between a first voltage and a second voltage, the first voltage is a product of the sampling resistor and the first current, and the second voltage is a product of the sampling resistor and the second current.

2. The voltage conversion circuit according to claim 1, characterized by The comparison circuit comprises an NMOS tube, a control end of the NMOS tube is connected to the output end of the sampling circuit, a drain of the NMOS tube is connected to a pull-up power supply and an input end of the enable control circuit, and a source of the NMOS tube is grounded.

3. The voltage conversion circuit of claim 1, wherein, The enable control circuit comprises an inverter, an output end and an input end of the inverter are respectively connected to the enable end of the first power supply circuit and the enable end of the second power supply circuit; The inverter is used for outputting an enable signal opposite to the input end of the inverter to the enable end of the first power supply circuit or the enable end of the second power supply circuit.

4. The voltage conversion circuit of claim 2, wherein, The inverter of the enable control circuit comprises a transistor inverter; An input end of the transistor inverter is connected to the drain of the NMOS tube, and an output end of the transistor inverter is connected to the enable end of the second power supply circuit.

5. The voltage conversion circuit of claim 1, wherein, The working current corresponding to the peak efficiency of the first power supply circuit is less than the working current corresponding to the peak efficiency of the second power supply circuit; The enable control circuit is used for outputting the high level to the first power supply circuit to control the first power supply circuit to work in a case that the sampling voltage is less than the reference voltage; Or In the case that the sampling voltage is greater than the reference voltage, a high level is output to the second power supply circuit to control the second power supply circuit to work.

6. An electronic device, comprising: The electronic device comprises a voltage conversion circuit, and the voltage conversion circuit is the voltage conversion circuit according to any one of claims 1-5.

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