Power supply and control method of power conversion circuit

Abstract

The present invention provides a control method for a power supply and a power conversion circuit, wherein the power supply includes a power conversion circuit, a comparison module, and an output mode control module. The power conversion circuit includes an inductor, a first output interface for inputting a first output value, and a second output interface for outputting a second output value. The comparison module includes a first amplifier coupled to the first output interface and a second amplifier coupled to the second output interface. The first amplifier is configured to output a first difference between the first output value and a first reference value. The second amplifier is configured to output a second difference between the second output value and a second reference value. The output mode control module is coupled to the comparison module, wherein when the first difference is within a first range, the output mode control module controls the power conversion circuit to output a first energy according to a first mode; and when the first difference is within a second range, the output mode control module controls the power conversion circuit to output a second energy according to a second mode.

Description

Technical Field

[0001] The present invention relates to a power supply and a control method for a power conversion circuit; in particular, to a power supply with an output mode adjusted according to a load and a control method. Background Art

[0002] Single-inductor double output (SIDO) power supplies have the advantages of high efficiency and low cost because they only require a single inductor. However, because there is only one inductor, the output quality will be affected by the cross regulation effect when outputting power. In addition, the output efficiency will also vary when responding to different application requirements, such as different loads. For example, when lightly loaded, there will be greater switching losses, which will cause the output efficiency to deteriorate. Therefore, how to improve the output quality and output efficiency of power supplies will be a major focus of development in this field. Summary of the Invention

[0003] One of the objectives of the present invention is to improve the output quality and output efficiency of a power supply.

[0004] The present invention provides a power supply including a power conversion circuit, a comparison module, and an output mode control module. The power conversion circuit includes an inductor, a first output interface, and a second output interface. The first output interface is used to input a first output value, and the second output interface is used to output a second output value. The comparison module includes a first amplifier and a second amplifier. The first amplifier is coupled to the first output interface and is used to output a first difference between the first output value and a first reference value. The second amplifier is coupled to the second output interface and is used to output a second difference between the second output value and the second reference value. The output mode control module is coupled to the comparison module, wherein when the first difference is within a first interval, the output mode control module controls the power conversion circuit to output a first energy according to a first mode; and when the first difference is within a second interval, the output mode control module controls the power conversion circuit to output a second energy according to a second mode.

[0005] In one embodiment, the first mode is that the power conversion circuit outputs the first energy through the first output interface or the second output interface; the second mode is that the power conversion circuit outputs a first part of the second energy through one of the first output interface and the second output interface, and then outputs a second part of the second energy through the other of the first output interface and the second output interface.

[0006] In one embodiment, the first interval is a range in which the first difference is greater than a first threshold and the second difference is less than a third threshold; the second interval is a range in which the first difference is greater than a second threshold and the second difference is greater than a fourth threshold.

[0007] In one embodiment, when the first difference is smaller than the first threshold and the second difference is smaller than a third threshold, the output mode control module controls the power conversion circuit to stop outputting.

[0008] In one embodiment, when the first difference is within the first range and the second difference is within a third range, the output mode control module controls the power conversion circuit to output the first energy through one of the first output interface and the second output interface, and then the inductor accumulates a third energy and outputs the third energy through the other of the first output interface and the second output interface.

[0009] In one embodiment, the inductor is charged along a charging path to obtain the first energy.

[0010] In one embodiment, the charging path is controlled by a first switch coupled between an input terminal of the power conversion circuit and a first terminal of the inductor, and a second switch coupled between a second terminal of the inductor and a ground terminal.

[0011] In one embodiment, the inductor and the first output interface form a first output path, which is controlled by a third switch coupled between a ground terminal and a first terminal of the inductor, and a fourth switch coupled between a second terminal of the inductor and the first output interface. The inductor and the second output interface form a second output path, which is controlled by a second switch coupled between the second terminal and the ground terminal, and a fifth switch coupled between the first terminal and the second output interface.

[0012] In one embodiment, the output mode control module includes: a control circuit coupled to the comparison module; and a driving circuit coupled to the control circuit for driving the power conversion circuit to perform the first mode or the second mode.

[0013] The present invention provides a control method for a power conversion circuit, comprising calculating an overload count, wherein the overload count is the number of times the ratio of the charging time to the discharging time of the power conversion circuit within a time period is greater than a first preset duty cycle; and controlling the power conversion circuit to enter a first mode or a second mode according to the overload count.

[0014] In one embodiment, when the power conversion circuit is in a preset mode, when the overload frequency is greater than a first preset frequency, the power conversion circuit enters the first mode output; when the power conversion circuit is outputting in the first mode, when the overload frequency is greater than a third preset frequency, the power conversion circuit enters the second mode output and when the overload frequency is less than a fifth preset frequency, the power conversion circuit enters the preset mode; when the power conversion circuit is outputting in the second mode, when the overload frequency is less than a sixth preset frequency, the power conversion circuit enters the first mode output.

[0015] In one embodiment, the method further includes: calculating a continuous overload count, wherein the continuous overload count is the continuous number of times the ratio of the charging time to the discharging time of the power conversion circuit is greater than a second preset duty cycle; and controlling the power conversion circuit to enter the first mode or the second mode according to the overload count.

[0016] In one embodiment, when the power conversion circuit is in a preset mode, when the overload frequency is greater than a first preset frequency or the continuous overload frequency is greater than a second preset frequency, the power conversion circuit enters the first mode output; when the power conversion circuit is outputting in the first mode, when the overload frequency is greater than a third preset frequency or the continuous overload frequency is greater than a fourth preset frequency, the power conversion circuit enters the second mode output and when the overload frequency is less than a fifth preset frequency, the power conversion circuit enters the preset mode; when the power conversion circuit is outputting in the second mode, when the overload frequency is less than a sixth preset frequency, the power conversion circuit enters the first mode output.

[0017] In one embodiment, the power conversion circuit has a first output interface and a second output interface. The first mode is to output a first energy from the first output interface, and after the power conversion circuit charges a second energy, output the second energy from the second output interface; the second mode is to output a first part of a third energy from the first output interface, and then output a second part of the third energy from the second output interface.

[0018] In one embodiment, when the power conversion circuit is in the default mode, the power conversion circuit stops at least a portion of its circuits.

[0019] In one embodiment, the first preset duty cycle is 50%.

[0020] In one embodiment, at least one of the first preset duty cycle and the second preset duty cycle is an adjustable value.

[0021] In one embodiment, at least one of the first preset duty cycle and the second preset duty cycle is adjusted in value according to switching between the mode.

[0022] As described above, the output mode of the power converter circuit is selected based on the difference between the power converter circuit's output and the reference voltage, or the duty cycle during charging. This allows for a more optimal output mode for different loads or application requirements, thereby improving the power supply's output quality and efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 FIG. 1 is a circuit diagram of a power supply according to an embodiment of the present invention.

[0024] Figures 2A to 2C FIG. 1 is a schematic diagram illustrating control and switching operations of a power conversion circuit according to an embodiment of the present invention.

[0025] Figure 3 FIG. 1 is a schematic diagram of a threshold range for mode switching in an embodiment of the present invention.

[0026] Figures 4A to 4C FIG. 1 is a schematic diagram of operations from the first mode to the third mode in one embodiment of the present invention.

[0027] Figure 5A and Figure 5B FIG. 1 is a flow chart of a power conversion circuit control method according to an embodiment of the present invention.

[0028] Figure 6 FIG. 1 is a schematic diagram of output mode switching of a power conversion circuit according to an embodiment of the present invention.

[0029] Description of main component symbols:

[0030] 10 Power supply

[0031] 110 Power Conversion Circuit

[0032] 111 Inductor

[0033] 1111,1112

[0034] 120 comparison modules

[0035] 121,122 amplifiers

[0036] 1211, 1212, 1213, 1221, 1222, 1223 input terminals

[0037] 1213, 1223 output terminals

[0038] 130 Output mode control module

[0039] 131 Control Circuit

[0040] 132 drive circuit

[0041] S1, S2, S3, S4, S5 switches

[0042] R resistor

[0043] P1, P2 output interface

[0044] L1, L2, Lc paths

[0045] A1, A2, A3, A4 areas

[0046] Vth1, Vth2, Vth3, Vth4 thresholds

[0047] A, B, D, D1, D2 energy

[0048] Steps S1-1, S1-2, S2-1, S2-2

[0049] M1, M2, M3, MD mode

[0050] Pth1, Pth2, Pth3, Pth4 paths DETAILED DESCRIPTION

[0051] The following drawings and detailed descriptions clearly illustrate the spirit of the present invention. After understanding the embodiments of the present invention, any person skilled in the art can change and modify the technology described in the present invention without departing from the spirit and scope of the present invention.

[0052] The terms "first," "second," etc., as used herein, do not specifically indicate an order or sequence, nor are they intended to limit the present invention; they are merely used to distinguish between elements or operations described by the same technical term. The terms "including," "comprising," "having," "containing," etc., as used herein, are open-ended terms, meaning including but not limited to.

[0053] The terms used herein generally have their ordinary meanings in the art, in the context of this disclosure, and in the specific context, unless otherwise noted. Certain terms used to describe the present disclosure are discussed below or elsewhere in this specification to provide additional guidance to those skilled in the art in describing the present disclosure.

[0054] In the accompanying drawings, the thickness of layers, plates, areas or spaces, etc., is exaggerated for clarity. Throughout the specification, the same reference numerals represent the same elements. It should be understood that when an element such as a layer, plate, area or space is referred to as being "on" or "connected to" another element, it can be interpreted as being directly on or connected to another element, or it can be interpreted as having or having an intermediate element between the element and the other element. As used herein, "connected" or "coupled" can refer to physical and / or electrical connections. Furthermore, in order to simplify the drawings and highlight the content to be presented in the drawings, the existing structures or elements in the drawings may be drawn in a simple schematic manner or presented in an omitted manner.

[0055] like Figure 1 As shown, the present invention provides a power supply 10 including a power conversion circuit 110, a comparison module 120, and an output mode control module 130. The power conversion circuit 110 includes an inductor 111, a first output interface P1, and a second output interface P2. It should be noted that the present invention is not limited to the use of the inductor 111, and the inductor 111 can also be replaced by other energy storage elements. The first output interface P1 and the second output interface P2 are respectively coupled to the inductor 111. Specifically, the power conversion circuit 110 can switch the output from the first output interface P1 to the second output interface P2 through switches S1-S5 or other selectors (such as multiplexers). The first output interface P1 is used to input a first output value Vop, and the second output interface P2 is used to output a second output value Von. It should be noted that in this embodiment, the voltage of the first output value Vop can be greater than the second output value Von, or the voltage of the second output value Von can be the negative value of the voltage of the first output value Vop. However, the present invention is not limited to the values ​​and types of the first output value Vop and the second output value Von.

[0056] The comparison module 120 includes a first amplifier 121 and a second amplifier 122. The first amplifier 121 is coupled to the first output interface P1 to output a first difference value Vep between the first output value Vop and the first reference value Vre1. The second amplifier 121 is coupled to the second output interface P2 to output a second difference value Ven between the second output value Von and the second reference value Vre2. It should be noted that the first output value Vop can be directly coupled to the first input terminal 1211 of the first amplifier 121, or it can be coupled to the first input terminal 1211 of the first amplifier 121 after being divided by Vop' through an element (such as a resistor R). It should be noted that the present invention is not limited to the amplitude and method of the voltage division of the first output value Vop. The first reference value Vre1 is input by the second input terminal 1212 of the first amplifier 121. The first difference value Vep is output by the output terminal 1213 of the first amplifier 121. It should be noted that the first difference value Vep can be, for example, the difference between the first output value Vop or the first output value Vop' after voltage division and the first reference value Vre1, or the difference between the first output value Vop or the first output value Vop' after voltage division and the first reference value Vre1 multiplied by a certain factor and then output. Similarly, the second output value Von can be directly coupled to the first input terminal 1221 of the second amplifier 122, or it can be coupled to the first input terminal 1221 of the second amplifier 122 after voltage division by an element (e.g., resistor R). The second reference value Vre2 is input by the second input terminal 1222 of the second amplifier 122. The second difference value Ven is output by the output terminal 1223 of the second amplifier 122. It should be noted that the second difference value Ven can be, for example, the difference between the second output value Von or the second output value Von' after voltage division and the second reference value Vre2, or the difference between the second output value Von or the second output value Von' after voltage division (the reference voltage is the third reference value Vre3) and the second reference value Vre2 multiplied by a certain factor. The first difference value Vep and the second difference value Ven are each output to the output mode control module 130 coupled to the comparison module 120.

[0057] In one embodiment, the output mode control module 130 includes a control circuit 131 coupled to the comparison module 120 and a driver circuit 132 coupled to the control circuit 131. The driver circuit 132 is configured to drive the power conversion circuit 110 to switch between the first mode and the second mode. For example, the driver circuit 132 generates control signals for switches S1-S5 in the power conversion circuit 110 to switch the charging or discharging path in the power conversion circuit 110.

[0058] like Figure 2AAs shown, the inductor 111 is charged along the charging path Lc to obtain the first energy. Specifically, the charging path Lc is controlled by a first switch S1 coupled between the input terminal P3 of the power conversion circuit 110 and the first terminal 1111 of the inductor 111, and a second switch S2 coupled between the second terminal 1112 of the inductor 111 and the ground terminal GND. For example, when the first switch S1 and the second switch S2 in the power conversion circuit 110 are connected and the remaining switches S3-S5 are open, the inductor 111 can accumulate energy. When the inductor 111 accumulates enough or requires energy, the energy can be output from the power conversion circuit 110 via the first output path L1 or the second output path L2. As shown Figure 2B The first output path L1 is controlled by a third switch S3 coupled between the ground terminal GND and the first terminal 1111 of the inductor 111, and a fourth switch S4 coupled between the second terminal 1112 of the inductor 111 and the first output port P1 of the power conversion circuit 110. For example, when the third switch S3 and the fourth switch S4 in the power conversion circuit 110 are connected and the remaining switches S1-S2 and S5 are disconnected, the energy accumulated in the inductor 111 can be output from the first output port P1 via the first output path L1. Figure 2C As shown, the second output path L2 is controlled by the second switch S2 and the fifth switch S5 coupled between the first terminal 1111 of the inductor 111 and the second output port P2 of the power conversion circuit 130. For example, when the second switch S2 and the fifth switch S5 in the power conversion circuit 110 are turned on and the remaining switches S1, S3, and S4 are turned off, the energy accumulated in the inductor 111 can be output from the second output port P2 via the second output path L2.

[0059] like Figure 3 As shown, when the first difference Vep is within the first interval A1, the output mode control module 130 controls the power conversion circuit 110 to output the first energy according to the first mode. When the first difference Vep is within the second interval A2, the output mode control module 130 controls the power conversion circuit 110 to output the second energy according to the second mode. For example, the first interval A1 is the range in which the first difference Vep is greater than the first threshold Vth1 and the second difference Ven is less than the third threshold Vth3. The second interval A2 is the range in which the first difference Vep is greater than the second threshold Vth2 and the second difference Ven is greater than the fourth threshold Vth4. It should be noted that the above embodiment only describes the relationship between the differences Vep and Ven and the thresholds Vth1 and Vth2, and is not limited to the first difference Vep. Similarly, the first interval A1 can also be, for example, the range in which the second difference Ven is greater than the third threshold Vth3 and the first difference Vep is less than the first threshold Vth1.

[0060] In one embodiment, when the first difference Vep is within the first interval A1 and the second difference Ven is within the third interval A3, the output mode control module 130 controls the power conversion circuit 130 to output in the third mode. Specifically, the third interval A3 is a range greater than a third threshold Vth3. In other words, when the first difference Vep is greater than the first threshold Vth1 and less than the second threshold Vth2, and the second difference Ven is greater than the third threshold Vth3, the power conversion circuit 130 outputs in the third mode.

[0061] In one embodiment, when the first difference Vep and the second difference Ven are in the fourth interval A4, the first difference Vep is less than the first threshold Vth1 and the second difference Ven is less than the third threshold Vth3, the output mode control module controls the power conversion circuit to stop outputting.

[0062] like Figure 4A As shown, the first mode M1 is when the power conversion circuit 130 outputs energy from the first output port P1 or the second output port P2. For example, after the inductor 111 of the power conversion circuit 130 accumulates energy A along the charging path Lc, it outputs energy A from the first output port P1. It should be noted that the present invention is not limited to the amount of energy accumulated by the inductor 111. The energy accumulated by the inductor 111 can be adjusted according to the load coupled to the first output port P1 or the second output port P2. For example, after the inductor 111 of the power conversion circuit 130 accumulates energy B along the charging path Lc, it outputs energy B from the second output port P2.

[0063] like Figure 4B As shown, in the second mode M2, the power conversion circuit 130 outputs a first portion D1 of energy D through one of the first output interface P1 and the second output interface P2, and then outputs a second portion D2 of energy D through the other of the first output interface P1 and the second output interface P2. For example, after the inductor 111 of the power conversion circuit 130 accumulates energy D through the charging path Lc, the first portion D1 of energy D is output through the first output interface P1, and then the second portion D2 of energy D is output through the second output interface P2. It should be noted that the above is merely an example, and the second mode M2 ​​is not limited to the order of output of the first output interface P1 and the second output interface P2, nor to the amount of energy output. For example, the second portion D2 of energy D can be output from the second output interface P2 first, and then the first portion D1 can be output through the first output interface P1. Furthermore, the present invention is not limited to the distribution of the first portion D1 and the second portion D2, nor to the total amount of energy D. The first portion D1, the second portion D2, and the total amount of energy D can be adjusted based on, for example, but not limited to, the loads coupled to the first output interface P1 and the second output interface P2.

[0064] like Figure 4CAs shown, the third mode M3 is that after the first output interface P1 and the second output interface P2 output the first energy, the inductor 111 accumulates the third energy and then outputs the third energy according to the other one of the first output interface P1 and the second output interface P2. Figure 4C As shown, after the inductor 111 of the power conversion circuit 130 accumulates energy A along the charging path Lc, it outputs energy A from the first output interface P1. The inductor 111 then accumulates energy B along the charging path Lc and outputs energy B from the second output interface P2. It should be noted that the third mode M3 is not limited to first outputting energy from the first output interface P1. In one embodiment, the inductor 111 may first accumulate energy B along the charging path Lc and then output energy B from the second output interface P2, and then accumulate energy A along the charging path Lc and then output energy A from the first output interface P1. It should be noted that Figures 4A to 4C The y-axis can represent current I, power P or energy E, and the x-axis can represent time t.

[0065] like Figure 5A As shown, the present invention provides a control method for a power conversion circuit, comprising: step S1-1 calculating the overload times, wherein the overload times are the times that the ratio of the charging time to the discharging time of the power conversion circuit within a time period is greater than a first preset duty cycle. And step S1-2 controlling the power conversion circuit to enter the first mode or the second mode according to the overload times. In one embodiment, as Figure 5B The control method of the power conversion circuit shown also includes step S2-1 for calculating the number of consecutive overloads, wherein the number of consecutive overloads is the number of consecutive times that the ratio of the charging time to the discharging time of the power conversion circuit is greater than the second preset duty cycle; and step S2-2 for controlling the power conversion circuit to enter the first mode or the second mode according to the number of overloads or the number of consecutive overloads. It should be noted that the first preset duty cycle can be the same as or different from the second preset duty cycle, and can be adjusted according to, for example, the load of the power conversion circuit, the inductance value of the inductor, or the usage requirements. In one embodiment, the first preset duty cycle is preferably 50%. It should be noted that the first preset duty cycle and / or the second preset duty cycle can be adjustable values. In other words, the calculation of the number of overloads and the judgment of the number of consecutive overloads are not fixed values, and the switching in and out of the mode can be changed to the values ​​of the first preset duty cycle and the second preset duty cycle, thereby increasing the stability of the operation. In one embodiment, the number of overloads and the number of consecutive overloads can be calculated by the output mode control module 130, thereby controlling the output mode of the power conversion circuit 110. However, Figure 5A and 5B The process is only an example, and the control method of the power conversion circuit of the present invention is not limited to Figure 5A and Figure 5BFor example, the control method of the power conversion circuit of the present invention can also perform mode switching of the power conversion circuit only by the number of consecutive overload times.

[0066] like Figure 6 As shown, when the power conversion circuit is in the preset mode MD, when the overload number LN is greater than the first preset number Nth1 (for example, 3 times) or the continuous overload number CLN is greater than the second preset number Nth2 (for example, 2 times), the power conversion circuit enters the first mode M1 output, as shown in FIG. Figure 6 When the power conversion circuit outputs in the first mode M1, when the overload number LN is greater than the third preset number Nth3 (for example, 6 times) or the continuous overload number CLN is greater than the fourth preset number Nth4 (for example, 4 times), the power conversion circuit enters the second mode M2 ​​output, as shown in FIG. Figure 6 When the power conversion circuit outputs in the first mode M1, when the overload number LN is less than the fifth preset number Nth5 (for example, 1 time), the power conversion circuit enters the preset mode MD, as shown in FIG. Figure 6 When the power conversion circuit outputs in the second mode M2, when the overload times LN is less than the sixth preset times Nth6 (for example, 3 times), the power conversion circuit enters the first mode M1 output, as shown in FIG. Figure 6 As shown in path pth4.

[0067] The preset mode MD is preferably a low-power mode. In the preset mode MD, the power supply 10 may shut down some analog circuits. It should be noted that the values ​​of the preset times Nth1-Nth6 are merely examples and are not intended to limit the present invention. The preset times Nth1-Nth6 may be combinations of positive integers that are the same, partially different, or completely different. Therefore, the present invention is not limited to the values ​​of the preset times Nth1-Nth6. Anyone skilled in the art may adjust the preset times Nth1-Nth6 for switching the power conversion circuit mode based on the load coupled to the power supply 10 and application requirements.

[0068] The present invention adjusts the output mode of the power conversion circuit by calculating the first difference and the second difference or the overload times and the continuous overload times, thereby improving the output quality and output efficiency of the power supply.

[0069] The present invention has been described with reference to the above embodiments. However, the above embodiments are merely exemplary embodiments of the present invention. It should be noted that the disclosed embodiments do not limit the scope of the present invention. On the contrary, modifications and equivalents within the spirit and scope of the claims are intended to be within the scope of the present invention.

Claims

1. A power supply, characterized in that: It includes: a power conversion circuit, a comparison module, and an output mode control module. The power conversion circuit includes: an inductor; a first output interface for outputting a first output value; and a second output interface for outputting a second output value; The comparison module includes: a first amplifier coupled to the first output interface, configured to output a first difference between the first output value and a first reference value; a second amplifier coupled to the second output interface, configured to output a second difference between the second output value and a second reference value; and an output mode control module coupled to the comparison module; When the first difference is within a first range, the output mode control module controls the power conversion circuit to output a first energy in a first mode; when the first difference is within a second range, the output mode control module controls the power conversion circuit to output a second energy in a second mode. The first mode is that the power conversion circuit outputs the first energy through the first output interface or the second output interface; the second mode is that the power conversion circuit outputs a first portion of the second energy through one of the first output interface and the second output interface, and then outputs a second portion of the second energy through the other of the first output interface and the second output interface.

2. The power supply according to claim 1, wherein: The first interval is a range in which the first difference is greater than a first threshold and the second difference is less than a third threshold; the second interval is a range in which the first difference is greater than a second threshold and the second difference is greater than a fourth threshold.

3. The power supply according to claim 2, wherein: When the first difference is smaller than the first threshold and the second difference is smaller than a third threshold, the output mode control module controls the power conversion circuit to stop outputting.

4. The power supply according to claim 1, wherein: When the first difference is within the first interval and the second difference is within a third interval, the output mode control module controls the power conversion circuit to output the first energy through one of the first output interface and the second output interface, and then the inductor accumulates a third energy and outputs the third energy through the other of the first output interface and the second output interface.

5. The power supply according to claim 1, wherein: The inductor is charged along a charging path to obtain the first energy.

6. The power supply according to claim 5, wherein: The charging path is controlled by a first switch coupled between an input terminal of the power conversion circuit and a first terminal of the inductor, and a second switch coupled between a second terminal of the inductor and a ground terminal.

7. The power supply according to claim 1, wherein: The inductor and the first output interface form a first output path, which is controlled by a third switch coupled between a ground terminal and a first terminal of the inductor, and a fourth switch coupled between a second terminal of the inductor and the first output interface. The inductor and the second output interface form a second output path, which is controlled by a second switch coupled between the second terminal and the ground terminal, and a fifth switch coupled between the first terminal and the second output interface.

8. The power supply according to claim 1, wherein: The output mode control module includes: a control circuit coupled to the comparison module; and A driving circuit is coupled to the control circuit and is used to drive the power conversion circuit to operate in the first mode or the second mode.

9. A control method for a power conversion circuit, characterized in that: Include: Calculating an overload count, wherein the overload count is the number of times a ratio of a charging time to a discharging time of the power conversion circuit within a time period is greater than a first preset duty cycle; and The power conversion circuit is controlled to enter a first mode or a second mode according to the overload times.

10. The control method according to claim 9, wherein: When the power conversion circuit is in a preset mode, when the overload frequency is greater than a first preset frequency, the power conversion circuit enters the first mode output; when the power conversion circuit is outputting in the first mode, when the overload frequency is greater than a third preset frequency, the power conversion circuit enters the second mode output and when the overload frequency is less than a fifth preset frequency, the power conversion circuit enters the preset mode; when the power conversion circuit is outputting in the second mode, when the overload frequency is less than a sixth preset frequency, the power conversion circuit enters the first mode output.

11. The control method according to claim 9, wherein: Also includes: Calculating a continuous overload number, wherein the continuous overload number is a continuous number of times that a ratio of a charging time to a discharging time of the power conversion circuit is greater than a second preset duty cycle; and The power conversion circuit is controlled to enter the first mode or the second mode according to the overload times.

12. The control method according to claim 11, wherein: When the power conversion circuit is in a preset mode, when the overload frequency is greater than a first preset frequency or the continuous overload frequency is greater than a second preset frequency, the power conversion circuit enters the first mode output; when the power conversion circuit is outputting in the first mode, when the overload frequency is greater than a third preset frequency or the continuous overload frequency is greater than a fourth preset frequency, the power conversion circuit enters the second mode output and when the overload frequency is less than a fifth preset frequency, the power conversion circuit enters the preset mode; when the power conversion circuit is outputting in the second mode, when the overload frequency is less than a sixth preset frequency, the power conversion circuit enters the first mode output.

13. The control method according to claim 9, wherein: The power conversion circuit has a first output interface and a second output interface. The first mode is to output a first energy from the first output interface, and after the power conversion circuit is charged with a second energy, output the second energy from the second output interface; The second mode is to output a first portion of the third energy from the first output interface, and then output a second portion of the third energy from the second output interface.

14. The control method according to claim 10, wherein: When the power conversion circuit is in the preset mode, the power conversion circuit stops at least a part of the circuit.

15. The control method according to claim 10, wherein: The first preset duty cycle is 50 percent.

16. The control method according to claim 11, wherein: At least one of the first preset duty cycle and the second preset duty cycle is an adjustable value.

17. The control method according to claim 16, wherein: At least one of the first preset duty cycle and the second preset duty cycle is adjusted in value according to switching in and out of the mode.

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