Voltage conversion circuit, power supply module and equipment

Abstract

The embodiment of the invention provides a voltage conversion circuit, a power module and equipment, and the circuit comprises a first freewheeling winding, and the first end of the first freewheeling winding is electrically connected with the first end of an output end. The first end of the second follow current winding is electrically connected with the first end of the output end; the energy storage module comprises an energy storage capacitor, a first part of an adjusting winding and a second part of the adjusting winding which are connected in series; the first freewheeling winding, the second freewheeling winding and the adjusting winding are on the same magnetic core. In a first time period, the energy storage module is in a first conduction state, the energy storage module is connected in series with the second end of the first follow current winding and connected in parallel with the second follow current winding, and the second part of the adjusting winding induces to generate a first voltage; in a second time period, the energy storage module is in a second conduction state, is connected in series with the second end of the second follow current winding and is connected in parallel with the first follow current winding, and the first part of the adjusting winding induces to generate a second voltage; and in the third time period, the energy storage module is in an open-circuit state. The conversion efficiency is improved.

Description

Technical Field

[0001] This application relates to the technical field of electronic circuits, and particularly to a voltage conversion circuit, a power supply module and a device. Background Art

[0002] With the development of communication technologies, the power supply requirements for ICT (Information and Communications Technology) devices are getting higher and higher. In the field of data centers, the power supply voltage of the DC bus is mostly 48 volts or 12 volts, while the required voltage for processing chips and the like is around 1 volt. Generally, it is necessary to step down the voltage of the DC bus and convert it into the voltage required by other devices such as processing chips.

[0003] As Figure 1 shown, it is a Buck bucking circuit commonly used in some technologies. In the circuit shown in Figure 1 , the voltage conversion is achieved through a pair of switches Q1, Q2, a pair of freewheeling switches S1, S2 and two inductors L1 and L2. In the application scenario with a large conversion ratio (D = Vout / Vin < 0.1), the equivalent conduction time DT of the main switch Q1 is too short and difficult to control, where T = 1 / f and T is the switch switching period. This circuit has a large current ripple and a low power conversion efficiency. Summary of the Invention

[0004] In view of this, this application provides a voltage conversion circuit, a power supply module and a device, which helps to solve the problems of low power conversion efficiency and large current ripple in the prior art.

[0005] In a first aspect, an embodiment of this application provides a voltage conversion circuit, including: an output terminal and at least one conversion branch;

[0006] The conversion branch includes:

[0007] A first freewheeling module, the first freewheeling module includes a first freewheeling winding; a first end of the first freewheeling winding is electrically connected to a first end of the output terminal, and is configured to output a target voltage to the output terminal;

[0008] A second freewheeling module, the second freewheeling module includes a second freewheeling winding; a first end of the second freewheeling winding is electrically connected to a first end of the output terminal, and is configured to output a target voltage to the output terminal;

[0009] An energy storage module, the energy storage module includes an energy storage capacitor, a first part of an adjustment winding and a second part of the adjustment winding connected in series; the first freewheeling winding, the second freewheeling winding and the adjustment winding are located on the same magnetic core;

[0010] Wherein, in the first time period, the energy storage module is in the first conduction state to output a target voltage through the first freewheeling winding; when the energy storage module is in the first conduction state, it is connected in series with the second end of the first freewheeling winding and in parallel with the second freewheeling winding, and the second part of the regulating winding generates a first voltage based on the second freewheeling winding.

[0011] In the second time period, the energy storage module is in the second conduction state to output a target voltage through the second freewheeling winding; when the energy storage module is in the second conduction state, it is connected in series with the second end of the second freewheeling winding and in parallel with the first freewheeling winding, and the first part of the regulating winding generates a second voltage based on the first freewheeling winding.

[0012] In the third time period, the energy storage module is in an open circuit state; the third time period is the other time in the preset conversion period except the first time period and the second time period.

[0013] In a possible implementation manner of the first aspect, the regulating winding is wound around the first column of the magnetic core.

[0014] The first part of the regulating winding is the part of the regulating winding located in the first window; the first window is in the magnetic core and is located between the first column and the second column, and the first column and the second column are two adjacent columns in the magnetic core.

[0015] The second part of the regulating winding is the part of the regulating winding located in the second window; the second window is in the magnetic core and is located between the first column and the third column, and the third column is adjacent to the first column in the magnetic core and is different from the second column.

[0016] In a possible implementation manner of the first aspect, the first freewheeling winding is located in the first window; the second freewheeling winding is located in the second window.

[0017] In a possible implementation manner of the first aspect, the first freewheeling module further includes a first freewheeling switch sub-module, one end of the first freewheeling switch sub-module is electrically connected to the second end of the first freewheeling winding; the other end of the first freewheeling switch sub-module is electrically connected to the second end of the output terminal; wherein, in the second time period and the third time period, the first freewheeling switch sub-module is in a conduction state, and in the first time period, the first freewheeling switch sub-module is in an open state.

[0018] In a possible implementation of the first aspect, the second freewheeling module further includes a second freewheeling switch sub-module. One end of the second freewheeling switch sub-module is electrically connected to the second end of the second freewheeling winding; the other end of the second freewheeling switch sub-module is electrically connected to the second end of the output terminal; wherein, in the first time period and the third time period, the second freewheeling switch sub-module is in a conducting state, and in the second time period, the second freewheeling switch sub-module is in an off state.

[0019] In a possible implementation of the first aspect, the energy storage module further includes a first switch module and a second switch module;

[0020] The first end of the first switch module is electrically connected to the energy storage capacitor, and the second end of the first switch module is used to externally connect to the first end of the input power supply; the second end of the output terminal is used to externally connect to the second end of the input power supply;

[0021] The first end of the second switch module is electrically connected to the energy storage capacitor, and the second end of the second switch module is electrically connected to the second end of the second freewheeling winding;

[0022] In the first time period, the energy storage module being in the first conducting state includes:

[0023] In the first time period, the first switch module is in a conducting state, and the second switch module is in an off state;

[0024] In the second time period, the energy storage module being in the second conducting state includes:

[0025] In the second time period, the first switch module is in an off state, and the second switch module is in a conducting state;

[0026] In the third time period, the energy storage module being in an open circuit state includes:

[0027] In the third time period, the first switch module is in an off state, and the second switch module is in an off state.

[0028] In a possible implementation of the first aspect, the number of turns of the first freewheeling winding and the second freewheeling winding is the same.

[0029] In a possible implementation of the first aspect, when the conversion branch includes at least two paths, there are adjacent first conversion branches and second conversion branches, wherein the third column in the first conversion branch is multiplexed as the second column in the second conversion branch.

[0030] In a possible implementation of the first aspect, when the transformation branch includes at least two paths, there are adjacent third and fourth transformation branches, where the first column in the third transformation branch is multiplexed as the second column of the fourth transformation branch, and the first column in the fourth transformation branch is multiplexed as the third column of the third transformation branch.

[0031] In a possible implementation of the first aspect, when the energy storage module in the third transformation branch is in the first conduction state, the energy storage module in the fourth transformation branch is in the second conduction state.

[0032] In a second aspect, an embodiment of the present application provides a power supply module, including: the voltage conversion circuit according to any one of the first aspects above.

[0033] In a third aspect, an embodiment of the present application provides an electronic device, including: the voltage conversion circuit according to any one of the first aspects above or including the power supply module according to the second aspect.

[0034] Adopting the solution provided by the embodiment of the present application, the voltage conversion circuit includes an output terminal and at least one conversion branch; wherein, the conversion branch includes: a first freewheeling module, a second freewheeling module and an energy storage module. The first freewheeling module includes a first freewheeling winding, the first end of the first freewheeling winding is electrically connected to the first end of the output terminal, and is used to output a target voltage to the output terminal; the second freewheeling module includes a second freewheeling winding, the first end of the second freewheeling winding is electrically connected to the first end of the output terminal, and is used to output a target voltage to the output terminal; the energy storage module includes an energy storage capacitor and an adjusting winding connected in series, and the adjusting winding, the first freewheeling winding and the second freewheeling winding are located on the same magnetic core; in the first time period, the energy storage module is in the first conduction state, so as to output the target voltage through the first freewheeling winding; when the energy storage module is in the first conduction state, it is connected in series with the second end of the first freewheeling winding and is connected in parallel with the second freewheeling winding, and the second part of the adjusting winding generates a first voltage based on the induction of the second freewheeling winding; in the second time period, the energy storage module is in the second conduction state, so as to output the target voltage through the second freewheeling winding; when the energy storage module is in the second conduction state, it is connected in series with the second end of the second freewheeling winding and is connected in parallel with the first freewheeling winding, and the first part of the adjusting winding generates a second voltage based on the induction of the adjusting winding; in the third time period, the energy storage module is in an open circuit state. In this way, by the energy storage module in the voltage conversion circuit being connected in series with the first freewheeling winding and in parallel with the second freewheeling winding in the first time period, and generating a first voltage by induction in the second part of the adjusting winding, and the energy storage module outputs the target voltage through the first freewheeling winding; in the second time period, it is connected in series with the second freewheeling winding and in parallel with the first freewheeling winding, and a second voltage is induced in the first part of the adjusting winding and the energy storage module outputs the target voltage through the second freewheeling winding. That is, in the first time period, the first part of the adjusting winding in the energy storage module and the first freewheeling winding together constitute an output inductor to output the target voltage to the output terminal. In the second time period, the second part of the adjusting winding in the energy storage module and the second freewheeling winding together constitute an output inductor to output the target voltage to the output terminal, which can reduce the volt-second product on the first freewheeling winding and the second freewheeling winding. Thus, when the voltage is converted, the current ripple can be reduced and the power conversion efficiency can be improved. Description of the Drawings

[0035] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0036] Figure 1 It is a schematic structural diagram of an existing Buck bucking circuit provided by the embodiment of the present application;

[0037] Figure 2Schematic diagram of a voltage conversion circuit provided by an embodiment of the present application;

[0038] Figure 3a Schematic diagram of an equivalent circuit of a voltage conversion circuit provided by an embodiment of the present application;

[0039] Figure 3b Schematic diagram of an equivalent circuit of another voltage conversion circuit provided by an embodiment of the present application;

[0040] Figure 4a Schematic diagram of a magnetic core structure provided by an embodiment of the present application;

[0041] Figure 4b Schematic diagram of another magnetic core structure provided by an embodiment of the present application;

[0042] Figure 5 Schematic diagram of another voltage conversion circuit provided by an embodiment of the present application;

[0043] Figure 6a Schematic diagram of an equivalent circuit of another voltage conversion circuit provided by an embodiment of the present application;

[0044] Figure 6b Schematic diagram of an equivalent circuit of another voltage conversion circuit provided by an embodiment of the present application;

[0045] Figure 6c Schematic diagram of an equivalent circuit of another voltage conversion circuit provided by an embodiment of the present application;

[0046] Figure 7a Schematic diagram of another voltage conversion circuit provided by an embodiment of the present application;

[0047] Figure 7b Schematic diagram of another voltage conversion circuit provided by an embodiment of the present application;

[0048] Figure 8a Schematic diagram of an equivalent circuit of another voltage conversion circuit provided by an embodiment of the present application;

[0049] Figure 8b Schematic diagram of an equivalent circuit of another voltage conversion circuit provided by an embodiment of the present application;

[0050] Figure 8c Schematic diagram of an equivalent circuit of another voltage conversion circuit provided by an embodiment of the present application;

[0051] Figure 9a Schematic diagram of an equivalent circuit of a voltage conversion circuit provided by an embodiment of the present application;

[0052] Figure 9b Schematic diagram of an equivalent circuit of another voltage conversion circuit provided by an embodiment of the present application;

[0053] Figure 9c Schematic diagram of an equivalent circuit of another voltage conversion circuit provided by an embodiment of the present application;

[0054] Figure 10 Schematic diagram of a timing diagram of a voltage conversion circuit provided by an embodiment of the present application;

[0055] Figure 11a Schematic diagram of a structure of another voltage conversion circuit provided by an embodiment of the present application;

[0056] Figure 11b Schematic diagram of a structure of another voltage conversion circuit provided by an embodiment of the present application;

[0057] Figure 11c Schematic diagram of a structure of another voltage conversion circuit provided by an embodiment of the present application;

[0058] Figure 12a Schematic diagram of a structure of an equivalent circuit of another voltage conversion circuit provided by an embodiment of the present application;

[0059] Figure 12b Schematic diagram of a structure of an equivalent circuit of another voltage conversion circuit provided by an embodiment of the present application;

[0060] Figure 12c Schematic diagram of a structure of an equivalent circuit of another voltage conversion circuit provided by an embodiment of the present application;

[0061] Figure 13 Schematic diagram of a structure of another voltage conversion circuit provided by an embodiment of the present application;

[0062] Figure 14 Schematic diagram of a structure of another voltage conversion circuit provided by an embodiment of the present application;

[0063] Figure 15 Schematic diagram of a structure of a power supply module provided by an embodiment of the present application;

[0064] Figure 16 Schematic diagram of an application scenario of a power supply module provided by an embodiment of the present application. Detailed implementation manners

[0065] For a better understanding of the technical solutions of the present application, the embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0066] It should be clear that the described embodiments are only a part of the embodiments of this application, rather than all embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of this application.

[0067] The terms used in the embodiments of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The singular forms "a", "the" and "said" used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0068] It should be understood that the term "and / or" used herein is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after.

[0069] As Figure 1 shown, a common Buck buck circuit in some technologies. In Figure 1 the shown circuit, voltage conversion is achieved through a pair of switches Q1, Q2, a pair of freewheeling switches S1, S2, and two inductors L1 and L2. In an application scenario with a large conversion ratio (D = Vout / Vin < 0.1), the equivalent conduction time DT of the main switch Q1 is too short and difficult to control, where T = 1 / f and T is the switch switching period. This circuit has a large current ripple and a low power conversion efficiency.

[0070] In view of the above problems, an embodiment of the present application provides a voltage conversion circuit, a power supply module, and a device. The voltage conversion circuit includes an output terminal and at least one conversion branch; wherein, the conversion branch includes: a first freewheeling module, a second freewheeling module, and an energy storage module. The first freewheeling module includes a first freewheeling winding, and the first end of the first freewheeling winding is electrically connected to the first end of the output terminal and is used to output a target voltage to the output terminal; the second freewheeling module includes a second freewheeling winding, and the first end of the second freewheeling winding is electrically connected to the first end of the output terminal and is used to output a target voltage to the output terminal; the energy storage module includes an energy storage capacitor and a regulating winding connected in series with each other, and the regulating winding, the first freewheeling winding, and the second freewheeling winding are located on the same magnetic core; in the first time period, the energy storage module is in a first conduction state to output the target voltage through the first freewheeling winding; when the energy storage module is in the first conduction state, it is connected in series with the second end of the first freewheeling winding and is connected in parallel with the second freewheeling winding, and the second part of the regulating winding generates a first voltage based on the induction of the second freewheeling winding; in the second time period, the energy storage module is in a second conduction state to output the target voltage through the second freewheeling winding; when the energy storage module is in the second conduction state, it is connected in series with the second end of the second freewheeling winding and is connected in parallel with the first freewheeling winding, and the first part of the regulating winding generates a second voltage based on the induction of the regulating winding; in the third time period, the energy storage module is in an open circuit state. In this way, in the voltage conversion circuit, the energy storage module is connected in series with the first freewheeling winding and in parallel with the second freewheeling winding in the first time period, and a first voltage is induced in the second part of the regulating winding, and the energy storage module outputs the target voltage through the first freewheeling winding; in the second time period, it is connected in series with the second freewheeling winding and in parallel with the first freewheeling winding, and a second voltage is induced in the first part of the regulating winding and the energy storage module outputs the target voltage through the second freewheeling winding. That is, in the first time period, the first part of the regulating winding in the energy storage module and the first freewheeling winding together form an output inductor to output the target voltage to the output terminal. In the second time period, the second part of the regulating winding in the energy storage module and the second freewheeling winding together form an output inductor to output the target voltage to the output terminal, which can reduce the volt-second product on the first freewheeling winding and the second freewheeling winding. Thus, during voltage conversion, the current ripple is reduced and the power supply conversion efficiency is improved. And the voltage conversion circuit described in the embodiment of the present application makes it easier to miniaturize the device. The following will be described in detail.

[0071] See Figure 2 , which is a schematic structural diagram of a voltage conversion circuit provided by an embodiment of the present application. As Figure 2 shown, the voltage conversion circuit includes an output terminal 21 and at least one conversion branch 22. Among them, the conversion branch 22 includes: a first freewheeling module 221, a second freewheeling module 222, and an energy storage module 223.

[0072] The first freewheeling module 221 includes a first freewheeling winding 2211. The first end of the first freewheeling winding 2211 is electrically connected to the first end of the output terminal 21 and is configured to output a target voltage to the output terminal 21.

[0073] The second freewheeling module 222 includes a second freewheeling winding 2221. The first end of the second freewheeling winding 2221 is electrically connected to the first end of the output terminal 21 and is configured to output a target voltage to the output terminal 21.

[0074] The energy storage module 223 includes an energy storage capacitor 2231, a first part of an adjustment winding 2232, and a second part of the adjustment winding 2232 connected in series with each other. The energy storage capacitor 2231 is used to externally connect to an input power supply. The first freewheeling winding 2211, the second freewheeling winding 2221, and the adjustment winding 2232 are located on the same magnetic core 24.

[0075] In the first time period, the energy storage module 223 is in a first conduction state to output a target voltage through the first freewheeling winding 2211. When the energy storage module 223 is in the first conduction state, it is connected in series with the second end of the first freewheeling winding 2211 and is connected in parallel with the second freewheeling winding 2221. The second part of the adjustment winding 2232 induces a first voltage based on the second freewheeling winding 2221.

[0076] In the second time period, the energy storage module 223 is in a second conduction state to output a target voltage through the second freewheeling winding 2221. When the energy storage module 223 is in the second conduction state, it is connected in series with the second end of the second freewheeling winding 2221 and is connected in parallel with the first freewheeling winding 2211. The first part of the adjustment winding 2232 induces a second voltage based on the first freewheeling winding 2211.

[0077] In the third time period, the energy storage module 223 is in an open circuit state. The third time period is the other time in the preset conversion period except for the first time period and the second time period.

[0078] It should be noted that the conversion period is the switching period of the switches of the preset conversion branch, and its duration can be set according to actual requirements.

[0079] In the embodiment of the present application, the voltage conversion circuit includes an output terminal 21 and at least one conversion branch 22. For each conversion branch 22, the conversion branch 22 includes a first freewheeling module 221, a second freewheeling module 222, and an energy storage module 223. Among them, the first freewheeling module 221 includes a first freewheeling winding 2211, the second freewheeling module 222 includes a second freewheeling winding 2221, the energy storage module 223 includes an energy storage capacitor 2231 and an adjustment winding 2232, and the energy storage capacitor 2231, the adjustment winding

[0080] The first part of the regulating winding 2232 and the second part of the regulating winding 2232 are connected in series with each other. The first freewheeling winding 2211, the second freewheeling winding 2221, and the regulating winding 2232 are located on the same magnetic core. In the voltage conversion circuit, the energy storage module 223 in the conversion branch 22 switches different conduction states at different time periods in each conversion cycle, so as to output a target voltage to the output terminal 21 through the first freewheeling winding 2211 or the second freewheeling winding 2221. In the first time period, the energy storage module 223 is in the first conduction state. When the energy storage module 223 is in the first conduction state, the energy storage module 223 is connected in series with the second end of the first freewheeling winding 2211 and is connected in parallel with the second freewheeling winding 2221, as shown in Figure 3a shown. The second part of the regulating winding 2232 generates a first voltage based on the second freewheeling winding 2221. Since the energy storage module 223 is connected in series with the second end of the first freewheeling winding 2211, that is, the energy storage module 223 is electrically connected to the output terminal 21 through the first freewheeling winding 2211, and the energy storage module 223 outputs the target voltage through the first freewheeling winding 2211.

[0081] In the first time period, since in the embodiment of the present application, the second part of the regulating winding 2232 generates a first voltage based on the second freewheeling winding 2221, the volt-second product of the first freewheeling winding 2211 can be reduced, and further the current ripple on the first freewheeling winding 2211 can be reduced.

[0082] In the second time period, the energy storage module 223 is in the second conduction state. When the energy storage module 223 is in the second conduction state, the energy storage module 223 is connected in series with the second end of the second freewheeling winding 2221 and is connected in parallel with the first freewheeling winding 2211, as shown in Figure 3b shown. The first part of the regulating winding 2232 generates a second voltage based on the first freewheeling winding 2211. Since the energy storage module 223 is connected in series with the second end of the second freewheeling winding 2221, that is, the energy storage module 223 is electrically connected to the output terminal 21 through the second freewheeling winding 2221, and the energy storage module 223 outputs the target voltage through the second freewheeling winding 2221.

[0083] In the second time period, since in the embodiment of the present application, the first part of the regulating winding 2232 generates a second voltage based on the first freewheeling winding 2211, the voltage stress of the second freewheeling winding 2221 can be reduced, and at the same time, the volt-second product of the second freewheeling winding 2221 can also be reduced, and further the current ripple on the second freewheeling winding 2221 can be reduced.

[0084] In the third time period, the energy storage module 223 is in an open circuit state, that is, there is no current flowing in the energy storage module 223. At this time, both the first freewheeling winding 2211 and the second freewheeling winding 2221 are in a state of releasing energy and output the target voltage to the output terminal 21.

[0085] As a possible implementation, as shown in Figure 4a and Figure 4b shown, the above-mentioned regulating winding 2232 is wound around the first column 241 of the magnetic core 24. The first part of the regulating winding 2232 is the part of the regulating winding 2232 located in the first window 242.

[0086] The first window 242 is located between the first column 241 and the second column 243. The first column 241 and the second column 243 are two adjacent columns in the magnetic core 24.

[0087] The second part of the regulating winding 2232 is the part of the regulating winding 2232 located in the second window 244.

[0088] The second window 244 is located between the first column 241 and the third column 245. The third column 245 is adjacent to the first column 241 in the magnetic core 24 and is different from the second column 243.

[0089] That is, the magnetic core 24 includes a first column 241, a second column 243 and a third column 245. Among them, the first column 241 is located between the second column 243 and the third column 245, and a first window 242 is formed between the first column 241 and the second column 243, and a second window 244 is formed between the first column 241 and the third column 245. In order to reduce the influence of electromagnetic induction generated by different parts of the regulating winding 2232 on other parts, the first part of the regulating winding 2232 and the second part of the regulating winding 2232 can be respectively arranged in different windows, that is, the first part of the regulating winding 2232 is arranged in the first window 242, and the second part of the regulating winding 2232 is arranged in the second window.

[0090] As a possible implementation, the first freewheeling winding 2211 is located in the first window 242; the second freewheeling winding 2221 is located in the second window 244.

[0091] In order to enhance the electromagnetic induction between the first part of the regulating winding 2232 and the first freewheeling winding 2211, and the electromagnetic induction between the second part of the regulating winding 2232 and the second freewheeling winding 2221, the first part of the regulating winding 2232 and the first regulating winding 2211 can be arranged in the same window, that is, both are arranged in the first window 242. The second part of the regulating winding 2232 and the second regulating winding 2221 are arranged in the same window, that is, both are arranged in the second window 244. In this way, when the current of the first freewheeling winding 2211 changes, the magnetic field of the first freewheeling winding 2211 changes. At this time, the first part of the first regulating winding 2232 located in the first window 242 with the first freewheeling winding 2211 generates an induced current in the changing magnetic field, and then generates an induced voltage.

[0092] Similarly, when the current in the second freewheeling winding 2221 changes, the magnetic field of the second freewheeling winding 2221 changes. At this time, the second part of the first regulating winding 2232, which is located in the second window 244 together with the second freewheeling winding 2221, generates an induced current in the changing magnetic field, thereby generating an induced voltage.

[0093] That is to say, in a conversion period, in the first time period, the energy storage module 223 is in the first conduction state. At this time, the energy storage module 223 is connected in series with the second end of the first freewheeling winding 2211 and in parallel with the second freewheeling winding 2221. At this time, the second part of the regulating winding 2232 in the energy storage module 223 is electrically connected to the second end of the first freewheeling winding 2211, and the first end of the first freewheeling winding 2211 is electrically connected to the first end of the output terminal 21. The energy storage module 223 can output a target voltage to the output terminal 21 through the first freewheeling winding 2211. The second freewheeling winding 2221 is connected in parallel with the regulating winding 2232. Since the second freewheeling winding 2221 and the second part of the regulating winding 2232 are both located in the second window 244, when the current in the second freewheeling winding 2221 changes, the second part of the regulating winding 2232 induces a first voltage. In this way, the volt-second product of the first freewheeling winding 2211 can be reduced in the branch where the energy storage module 223 is connected in series with the first freewheeling winding 2211, thereby reducing the current ripple at the first freewheeling winding 2211.

[0094] In the second time period, the energy storage module 223 is in the second conduction state. At this time, the energy storage module 223 is connected in series with the second end of the second freewheeling winding 2221 and in parallel with the first freewheeling winding 2211. At this time, the energy storage capacitor 2231 in the energy storage module 223 is electrically connected to the second end of the second freewheeling winding 2221, and the first end of the second freewheeling winding 2221 is electrically connected to the first end of the output terminal 21. The energy storage module 223 can output a target voltage to the output terminal 21 through the second freewheeling winding 2221. The first freewheeling winding 2211 is connected in parallel with the regulating winding 2232. Since the first freewheeling winding 2211 and the first part of the regulating winding 2232 are both located in the first window 242, when the current in the first freewheeling winding 2211 changes, the first part of the regulating winding 2232 induces a second voltage. In this way, the volt-second product of the second freewheeling winding 2221 can be reduced in the branch where the energy storage module 223 is connected in series with the second freewheeling winding 2221, thereby reducing the current ripple at the second freewheeling winding 2221.

[0095] As a possible implementation, as Figure 5 shown, the first freewheeling module 221 further includes a first freewheeling switch sub-module 2212. One end of the first freewheeling switch sub-module 2212 is electrically connected to the second end of the first freewheeling winding 2211; the other end of the first freewheeling switch sub-module 2212 is electrically connected to the second end of the output terminal 21.

[0096] Among them, in the second time period and the third time period, the first freewheeling switch sub-module 2212 is in the on state, and in the first time period, the first freewheeling switch sub-module 2212 is in the off state.

[0097] That is, in order to facilitate the switching of the series-parallel structure of the energy storage module 223 and the second end of the first freewheeling winding 2211, the first freewheeling module 221 includes a first freewheeling switch sub-module 2212, and the series and parallel connection between the energy storage module 223 and the second end of the first freewheeling winding 2211 is controlled by the first freewheeling switch sub-module 2212. At this time, one end of the first freewheeling switch sub-module 2212 is electrically connected to the second end of the first freewheeling winding 2211, and the second end of the first freewheeling switch sub-module 2212 is electrically connected to the second end of the output terminal 21. In this way, as Figure 6a shown, in the first time period, the first freewheeling switch sub-module 2212 is in the off state, the second end of the first freewheeling winding 2211 is disconnected from the second end of the output terminal 21, and the second end of the first freewheeling winding 2211 is electrically connected to the energy storage module 223. The current can flow from the energy storage module 223 through the first freewheeling module 2211 to the output terminal 21 to output the target voltage to the input terminal 21. Therefore, in the first time period, the energy storage module 223 is in series with the second end of the first freewheeling winding 2211. And because the energy storage module 223 is in parallel with the second freewheeling winding 2221, when the second freewheeling winding 2221 releases energy, at this time, the second part of the regulating winding 2232 located in the same window will generate an induced voltage, that is, the first voltage is induced, so that the volt-second product on the first freewheeling winding 2211 can be reduced.

[0098] In the second time period, as Figure 6bAs shown, the first freewheeling switch sub-module 2212 is in the conducting state, and the second end of the first freewheeling winding 2211 is electrically connected to the second end of the output terminal 21. The energy storage module 223 is also electrically connected to the second end of the output terminal 21 through the first freewheeling switch sub-module 2212. And in the second time period, the energy storage module 223 is connected in series with the second end of the second freewheeling winding 2221, and the first end of the second freewheeling winding 2221 is electrically connected to the first end of the output terminal 21. That is, the energy storage module 223 is electrically connected to the first end of the output terminal 21 through the second freewheeling winding 2221 and is electrically connected to the second end of the output terminal 21 through the first freewheeling switch sub-module 2212. The first end of the first freewheeling winding 2211 is electrically connected to the first end of the output terminal 21, and the second end of the first freewheeling winding 2211 is electrically connected to the second end of the output terminal 21 through the first freewheeling switch sub-module 2212. In this way, in the second time period, the energy storage module 223 can be connected in parallel with the first freewheeling winding 2211 through the first freewheeling switch sub-module 2212. At this time, the first freewheeling winding 2211 provides the target voltage for the output terminal 21 by releasing the energy stored therein. And the energy storage module 223 outputs the target voltage to the output terminal 21 through the second freewheeling winding 2221. And, since the energy storage module 223 is connected in parallel with the first freewheeling winding 2211, when the first freewheeling winding 2211 releases energy, a part of the first part of the regulating winding 2232 in the same window will generate an induced voltage at this time, that is, the second voltage is induced, so that the volt-second product on the second freewheeling winding 2221 can be reduced.

[0099] In the third time period, as Figure 6c shown, when the first freewheeling switch sub-module 2212 is in the conducting state, the second end of the first freewheeling winding 2211 is electrically connected to the second end of the output terminal 21. And at this time, the energy storage module 223 is in the open circuit state, that is, there is no current in the energy storage module 223. At this time, the second end of the first freewheeling winding 2211 is electrically connected to the second end of the output terminal 21 through the first freewheeling switch sub-module 2212. The first freewheeling winding 2211 provides the target voltage for the output terminal 21 by releasing the energy stored therein.

[0100] As a possible implementation, referring to Figure 5 shown, the second freewheeling module 222 further includes a second freewheeling switch sub-module 2222. One end of the second freewheeling switch sub-module 2222 is electrically connected to the second end of the second freewheeling winding 2221; the other end of the second freewheeling switch sub-module 2222 is electrically connected to the second end of the output terminal 21.

[0101] Wherein, the second freewheeling switch sub-module 2222 is in the conducting state in the first time period and the third time period, and the second freewheeling switch sub-module 2222 is in the off state in the second time period.

[0102] That is, to facilitate the control of the switching between the series and parallel structures of the energy storage module 223 and the second end of the second freewheeling winding 2221, the second freewheeling module 222 includes a second freewheeling switch sub-module 2222, which controls the series and parallel connection between the energy storage module 223 and the second end of the second freewheeling winding 2221. At this time, one end of the second freewheeling switch sub-module 2222 is electrically connected to the second end of the second freewheeling winding 2221, and the other end of the second freewheeling switch sub-module 2222 is electrically connected to the second end of the output terminal 21. In this way, referring to Figure 6a As shown, in the first time period, the second freewheeling switch sub-module 2222 is in the conducting state. At this time, the second end of the second freewheeling winding 2221 is electrically connected to the second end of the output terminal 21, and the energy storage module 223 is also electrically connected to the second end of the output terminal 21 through the second freewheeling switch sub-module 2222. Moreover, in the first time period, the energy storage module 223 is electrically connected to the second end of the first freewheeling winding 2211, and the first freewheeling switch sub-module 2212 is in the off state. Therefore, the energy storage module 223 is electrically connected to the first end of the output terminal 21 through the first freewheeling winding 2211, and the first end of the second freewheeling winding 2221 is also electrically connected to the first end of the output terminal 21. That is to say, the first end of the second freewheeling winding 2221 is electrically connected to the first end of the output terminal 21, and the second end of the second freewheeling winding 2221 is electrically connected to the second end of the output terminal 21 through the second freewheeling switch sub-module 2222. The energy storage module 223 is electrically connected to the first end of the output terminal 21 through the first freewheeling winding 2211, and the energy storage module 223 is also electrically connected to the second end of the output terminal 21 through the second freewheeling switch sub-module 2222. Therefore, in the first time period, the first freewheeling switch sub-module 2212 is in the off state, and the second freewheeling switch sub-module 2222 is in the conducting state. The energy storage module 223 is in series with the first freewheeling winding 2211 and in parallel with the second freewheeling winding 2221. Moreover, since the energy storage module 223 is in parallel with the second freewheeling winding 2221, when the second freewheeling winding 2221 releases energy, the second part of the regulating winding 2232 in the same window will generate an induced voltage at this time, that is, the first voltage is induced, so as to reduce the volt-second product on the first freewheeling winding 2211.

[0103] In the second time period, referring to Figure 6bAs shown, the second freewheeling switch sub-module 2222 is in the off state, the second end of the second freewheeling winding 2221 is disconnected from the second end of the output terminal 21, and the energy storage module 223 is electrically connected to the second end of the second freewheeling winding 2221. Therefore, the energy storage module 223 can be electrically connected to the first end of the output terminal 21 through the second freewheeling winding 2221. In the second time period, since the first freewheeling switch sub-module 2212 is in the on state, the second end of the first freewheeling winding 2211 is electrically connected to the second end of the output terminal 21, and the energy storage module 223 is also electrically connected to the second end of the output terminal 21 through the first freewheeling switch sub-module 2212. Therefore, in the second time period, the first freewheeling switch sub-module 2212 is in the on state, and the second freewheeling switch sub-module 2222 is in the off state. At this time, the energy storage module 223 is connected in series with the second end of the second freewheeling winding 2221 and is connected in parallel with the first freewheeling winding 2211. Moreover, since the energy storage module 223 is connected in parallel with the first freewheeling winding 2211, when the first freewheeling winding 2211 releases energy, a part of the first part of the regulating winding 2232 in the same window will generate an induced voltage at this time, that is, the second voltage is induced, so as to reduce the volt-second product on the second freewheeling winding 2221.

[0104] In the third time period, referring to Figure 6c As shown, when the second freewheeling switch sub-module 2222 is in the on state, the second end of the second freewheeling winding 2221 is electrically connected to the second end of the output terminal 21. At this time, the energy storage module 223 is in an open circuit state, that is, there is no current in the energy storage module 223. At this time, the second end of the second freewheeling winding 2221 is electrically connected to the second end of the output terminal 21 through the second freewheeling switch sub-module 2222. The second freewheeling winding 2221 provides the target voltage for the output terminal 21 by releasing the energy stored therein.

[0105] It should be noted that when the first freewheeling switch sub-module 2212 and the second freewheeling switch sub-module 2222 are in the off state, they are marked by the Open symbol in the drawings. That is, if the first freewheeling switch sub-module 2212 is in the off state, the first freewheeling switch sub-module 2212 is marked by the Open symbol in the drawings. If the second freewheeling switch sub-module 2222 is in the off state, it will be marked by the Open symbol through the second freewheeling switch sub-module 2222.

[0106] As a possible implementation, as Figure 7a shown, the energy storage module 223 further includes a first switch module 2233 and a second switch module 2234.

[0107] The first end of the first switch module 2233 is electrically connected to the energy storage capacitor 2231, and the second end of the first switch module 2233 is used for connecting to an external input power supply.

[0108] The first end of the second switch module 2234 is electrically connected to the energy storage capacitor 2231, and the second end of the second switch module 2234 is electrically connected to the second end of the second freewheeling winding 2221.

[0109] During the first time period, the energy storage module 223 being in the first conduction state includes:

[0110] During the first time period, the first switch module 2233 is in the conduction state and the second switch module 2234 is in the off state.

[0111] During the second time period, the energy storage module 223 being in the second conduction state includes:

[0112] During the second time period, the first switch module 2233 is in the off state and the second switch module 2234 is in the conduction state.

[0113] During the third time period, the energy storage module 223 being in the open circuit state includes:

[0114] During the third time period, the first switch module 2233 is in the off state and the second switch module 2234 is in the off state.

[0115] It should be noted that when the first switch module 2233 and the second switch module 2234 are in the off state, they are also marked by the Open symbol in the drawings. That is, if the first switch module 2233 is in the off state, the first switch module 2233 is marked by the Open symbol in the drawings; if the second switch module 2234 is in the off state, the second switch module 2234 is marked by the Open symbol.

[0116] In the embodiment of the present application, the voltage conversion circuit needs to convert the externally connected input power supply voltage into a target voltage and output it through the output terminal 21. At this time, the voltage conversion circuit can be realized through the charging and discharging process of the energy storage capacitor 2231 in the energy storage module 223. In order to facilitate the control of the switching of the charging and discharging states of the energy storage capacitor 2231 in the energy storage module 223, the energy storage module 223 further includes a first switch module 2233 and a second switch module 2234. In this way, it can be realized by controlling the conduction and disconnection of the first switch module 2233 and the second switch module 2234. Among them, the first end of the first switch module 2233 is electrically connected to the energy storage capacitor 2231, and the second end of the first switch module 2233 is used to externally connect the first end of the input power supply. The first end of the second switch module 2234 is electrically connected to the storage capacitor 2231, and the second end of the second switch module 2234 is electrically connected to the second end of the second freewheeling winding 2221. In the first time period, the first switch module 2233 is controlled to be in the conducting state, the second switch module 2234 is controlled to be in the off state, and the first freewheeling switch sub-module 2212 is controlled to be in the off state, and the second freewheeling switch sub-module 2222 is controlled to be in the conducting state. At this time, as Figure 8a and 9a shown, the input power supply provides a charging voltage to the energy storage capacitor 2231 through the first switch module 2233, and the energy storage capacitor 2231 is in the charging state. The second part of the regulating winding 2232 in the energy storage module 223 is electrically connected to the second end of the first freewheeling winding 2211, and the first end of the first freewheeling winding 2211 is electrically connected to the first end of the output terminal 21. That is, the externally connected input power supply is electrically connected to the first end of the output terminal 21 through the energy storage module 223 and the first freewheeling winding 2211. At this time, when the energy storage capacitor 2231 is stable, the input power supply can provide a target voltage to the output terminal through the energy storage module 223 and the first freewheeling winding 2211. Since the second switch module 2234 is disconnected and the second freewheeling switch sub-module 2222 is in the conducting state, the second end of the second freewheeling winding 2221 is electrically connected to the second end of the output terminal 21, and the first end of the second freewheeling winding 2221 is electrically connected to the first end of the output terminal 21. At this time, the second freewheeling winding 2221 provides a target voltage to the output terminal 21 by releasing energy. That is, in the first time period, the second freewheeling winding 2221 is in parallel with the branch where the energy storage module 223 is located, and provides a target voltage to the output terminal 21 at the same time. And, since the energy storage module 223 is in parallel with the second freewheeling winding 2221, when the second freewheeling winding 2221 releases energy, an induced voltage will be generated at the second part of the regulating winding 2232 located in the same window at this time, that is, the first voltage is induced, so as to reduce the volt-second product on the first freewheeling winding 2211.

[0117] In the second time period, as Figure 8b and 9bAs shown, the first switch module 2233 is controlled to be in the off state, the second switch module 2234 is controlled to be in the on state, and the first freewheeling switch sub-module 2212 is controlled to be in the off state, and the second freewheeling switch sub-module 2222 is controlled to be in the on state. At this time, the branch between the energy storage capacitor 2231 and the input power supply is disconnected, while the branch between the energy storage capacitor 2231 and the second freewheeling winding 2221 is conducting. That is, one end of the energy storage capacitor 2231 is electrically connected to the second end of the second freewheeling winding 2221, the first end of the second freewheeling winding 2221 is electrically connected to the first end of the output terminal 21, and the other end of the energy storage capacitor 2231 is electrically connected to one end of the first part of the regulating winding 2232. The other end of the first part of the regulating winding 2232 is electrically connected to one end of the second part of the regulating winding 2232. Since the first freewheeling switch sub-module 2212 is conducting, the other end of the second part of the regulating winding 2232 is electrically connected to the second end of the output terminal 21 through the first freewheeling switch sub-module 2212. That is, the energy storage module 223 is electrically connected to the first end of the output terminal 21 through the second freewheeling winding 2221, and is electrically connected to the second end of the output terminal 21 through the first freewheeling switch sub-module 2212. The energy storage capacitor 2231 in the energy storage module 223 discharges to provide the target voltage for the output terminal 21. The second end of the first freewheeling winding 2211 is electrically connected to the second end of the output terminal 21 through the first freewheeling switch sub-module 2212, and the first end of the first freewheeling winding 2211 is electrically connected to the first end of the output terminal 21. The first freewheeling winding 2211 can provide the target voltage for the output terminal 21 by releasing energy. That is, in the second time period, the branch where the energy storage module 223 and the second freewheeling winding 2221 are located is in parallel with the first freewheeling winding 2211, and provides the target voltage for the output terminal 21 at the same time. And, since the energy storage module 223 is in parallel with the first freewheeling winding 2211, when the first freewheeling winding 2211 releases energy, an induced voltage will be generated at the first part of the regulating winding 2232 in the same window at this time, that is, the second voltage is induced, so that the volt-second product on the second freewheeling winding 2221 can be reduced.

[0118] In the third time period, as Figure 8c and 9cAs shown, the first switching module 2233 and the second switching module 2234 are both controlled to be in the off state. And the first freewheeling switching sub-module 2212 and the second freewheeling switching sub-module 2222 are both controlled to be in the on state. At this time, the energy storage module 223 is in an open circuit state, that is, the electrical connection between the energy storage capacitor 2231 in the energy storage module 223 and the input power supply is disconnected, and the electrical connection with the second end of the second freewheeling winding 2221 is also disconnected. Since the first freewheeling switching sub-module 2212 is in the on state, the second end of the first freewheeling winding 2211 is electrically connected to the second end of the output terminal 21, and the first end of the first freewheeling winding 2211 is electrically connected to the first end of the output terminal 21. At this time, the first freewheeling winding 2211 can provide the target voltage for the output terminal by releasing energy. Similarly, since the second freewheeling switching sub-module 2222 is in the on state, the second end of the second freewheeling winding 2221 is electrically connected to the second end of the output terminal 21, and the first end of the second freewheeling winding 2221 is electrically connected to the first end of the output terminal 21. At this time, the second freewheeling winding 2221 can provide the target voltage for the output terminal by releasing energy. That is, in the third time period, the first freewheeling winding 2211 and the second freewheeling winding 2221 are connected in parallel to provide the target voltage for the output terminal 21 at the same time.

[0119] That is to say, in the embodiment of the present application, the energy storage capacitor 2231 has a voltage dividing effect on the voltage of the input power supply. In some embodiments, the energy storage capacitor 2231 can divide the voltage of the input power supply by half. At this time, the voltage difference across the energy storage capacitor 2231 is half of the voltage of the input power supply. In order to realize the switching of different charge and discharge states of the energy storage capacitor 2231, the switching timings of the first switching module 2233 and the second switching module 2234 need to differ by 180 degrees, as Figure 10As shown, it undertakes the chopping function. At the same time, in each conversion period, the switching timing of the first freewheeling switch sub-module 2212 is complementary to that of the first switch module 2233. That is, in each conversion period, when the first switch module 2233 is turned on, the first freewheeling switch sub-module 2212 is turned off, and when the first switch module 2233 is turned off, the first freewheeling switch sub-module 2212 is turned on. In this way, the first freewheeling switch sub-module 2212 can realize the freewheeling function of the first switch module 2233. Similarly, in each conversion period, the switching timing of the second freewheeling switch sub-module 2222 is complementary to that of the second switch module 2234. That is, in each conversion period, when the second switch module 2234 is turned on, the second freewheeling switch sub-module 2222 is turned off, and when the second switch module 2234 is turned off, the second freewheeling switch sub-module 2222 is turned on. In this way, the second freewheeling switch sub-module 2222 can realize the freewheeling function of the second switch module 2234. When the regulating winding 2232 is in the first time period, since it is connected in series with the first freewheeling winding 2211 and in parallel with the second freewheeling winding 2221, and the second freewheeling winding 2221 is a freewheeling inductor to provide the target voltage for the output terminal 21, the second part of the regulating winding 2232 and the second freewheeling winding 2221 induce a first voltage, and the first part of the regulating winding 2232 and the first freewheeling winding 2211 together form an output inductor to provide the target voltage for the output terminal 21. At this time, the regulating winding 2232 not only realizes the function of the transformer but also realizes the function of the filter inductor. Similarly, when in the second time period, since it is connected in parallel with the first freewheeling winding 2211 and in series with the second freewheeling winding 2221, and the first freewheeling winding 2211 is a freewheeling inductor to provide the target voltage for the output terminal 21, the first part of the regulating winding 2232 and the first freewheeling winding 2211 induce a second voltage, and the second part of the regulating winding 2232 and the second freewheeling winding 2221 together form an output inductor to provide the target voltage for the output terminal 21. At this time, the regulating winding 2232 not only realizes the function of the transformer but also realizes the function of the filter inductor.

[0120] It should be noted that in Figure 10 the shown timing diagram, in order to avoid short circuits, appropriate "dead zone" time is added to the first switch module 2233 and the first freewheeling switch sub-module 2212, and appropriate "dead zone" time is also added to the second switch module 2234 and the second freewheeling switch sub-module 2222.

[0121] It should be understood that referring to Figure 10 it can be known that in the embodiments of the present application, the first time period and the second time period are not two adjacent time periods. The first time period is the time period when the first switch module 2233 is turned on, that is, the Figure 10 time period from 0 to Ton in Figure 10The time period from T / 2 to T / 2 + Ton. The third period is the time other than the first and second periods in the switching period T, that is, the third period includes two time periods, namely the time period from Ton to T / 2 and the time period from T / 2 + Ton to T.

[0122] In some embodiments, referring to Figure 7a As shown, the second end of the first switching module 2233 is externally connected to one end of the input power supply, and the second end of the output terminal 21 is externally connected to the other end of the input power supply. Thus, in the first period, the external power supply can form a closed-loop circuit with the output terminal 21 through the energy storage module 223 and the first freewheeling winding 2211, so as to provide the target voltage for the output terminal 21.

[0123] Since in the embodiments of the present application, when the energy storage module 223 is working, a corresponding voltage will be induced in the regulating winding 2232 therein, and this induced voltage can reduce the volt-second product on the freewheeling winding acting as the output inductor. That is to say, in the first period, due to the second part of the regulating winding 2232 inducing a first voltage, at this time, the first freewheeling winding 2211 and the first part of the regulating winding 2232 together constitute the output voltage, so the volt-second product on the first freewheeling winding 2211 is reduced. In the second period, due to the first part of the regulating winding 2232 inducing a second voltage, at this time, the second freewheeling winding 2221 and the second part of the regulating winding 2232 together constitute the output voltage, so the volt-second product on the second freewheeling winding 2221 is reduced. The specific description is as follows:

[0124] Since the implementation processes of the first freewheeling winding 2211 and the second freewheeling winding 2221 are the same, the first freewheeling winding 2211 is taken as an example for description. In the first period, the first switching module 2233 is turned on, the second switching module 2234 is turned off, the first freewheeling switch sub-module 2212 is turned off, and the second freewheeling switch sub-module 2222 is turned on. At this time, the energy storage module 223 is electrically connected to the first end of the output terminal 21 through the first freewheeling winding 2211, and is electrically connected to the second end of the output terminal 21 through the external input power supply. When the energy storage capacitor 2231 is stable, the input power supply can provide the target voltage for the output terminal through the energy storage module 223 and the first freewheeling winding 2211. For the convenience of description, the target voltage is represented by V o and the input power supply voltage is represented by V in . Since the second freewheeling winding 2221 provides the target voltage V o for the output terminal 21, the voltage on the second freewheeling winding 2221 is V o . The first voltage induced by the second part of the regulating winding 2232 is related to the number of turns of the second part of the regulating winding 2232 and the number of turns of the second freewheeling winding 2221. When the number of turns of the second part of the regulating winding 2232 is N p, when the number of turns of the second freewheeling winding 2221 is N2, the first voltage is At this time, the voltage drops on the first part of the regulating winding 2232 and the first freewheeling winding 2211 are Among them, V c represents the voltage on the energy storage capacitor 2231. When the energy storage capacitor 2231 can divide the input power supply voltage in half, the voltage drops on the first part of the regulating winding 2232 and the first freewheeling winding 2211 are

[0125] In the second and third time periods of the conversion cycle, the first freewheeling winding 2211 serves as a freewheeling inductor. At this time, the voltage on the first freewheeling winding 2211 is V o . According to the volt-second balance on the winding within a conversion cycle, it can be obtained that:

[0126] Among them, N1 represents the number of turns of the first freewheeling winding 2211, T represents the conversion cycle, D represents the duty ratio, the value of D is greater than 0 and not greater than 0.5. In some embodiments, the value of D is 0.3. Based on the above formula, it can be known that

[0127] It can be seen from this that the duty ratio in this application is increased by times compared with the duty ratio in the traditional buck circuit. That is, since the coil of the winding is at least 1 turn, when N p = N1 = 1, the duty ratio in the embodiment of this application is increased by at least 4 times compared with the duty ratio in the traditional buck circuit, thereby greatly reducing the current ripple on the voltage conversion circuit. And, due to the increase in the duty ratio of the switching module, the control difficulty of the first switching module 2233 and the second switching module 2234 is greatly reduced, making the voltage conversion circuit described in the embodiment of this application easier to implement.

[0128] As a possible implementation manner, the number of turns of the above-mentioned first freewheeling winding 2211 and the second freewheeling winding 2221 are the same. That is, the number of turns of the first freewheeling winding 2211 and the second freewheeling winding 2221 are the same. At this time, the voltage values of the first voltage and the second voltage are equal. That is, the voltage value of the first voltage induced by the second part of the regulating winding 2232 in the first time period is equal to the voltage value of the second voltage induced by the first part of the regulating winding 2232 in the second time period.

[0129] As a possible implementation manner, the above-mentioned first switching module 2233 and the second switching module 2234 are both MOS transistors. In some embodiments, such as Figure 11a , Figure 11b and Figure 11cAs shown, both the above-mentioned first switch module 2233 and second switch module 2234 are N-type MOS transistors. For convenience of description, the N-type MOS transistor of the first switch module 2233 is referred to as transistor Q1, and the N-type MOS transistor of the second switch module 2234 is referred to as transistor Q2. At this time, the source of transistor Q1 is electrically connected to the energy storage capacitor 2231, that is, the source of transistor Q1 is electrically connected to one end of the energy storage capacitor 2231, and the other end of the energy storage capacitor 2231 is electrically connected to the first part of the regulating winding 2232. The drain of transistor Q1 is used to externally connect the input power supply, and the gate of transistor Q1 is used to receive the control signal. The source of transistor Q2 is electrically connected to the second end of the second freewheeling winding 2221, the drain of transistor Q2 is electrically connected to one end of the energy storage capacitor 2231, and the gate of transistor Q2 is used to receive the control signal.

[0130] As a possible implementation manner, both the above-mentioned first freewheeling switch sub-module 2212 and second freewheeling switch sub-module 2222 are MOS transistors. In some embodiments, with reference to Figure 11a and Figure 11b As shown, both the above-mentioned first freewheeling switch sub-module 2212 and second freewheeling switch sub-module 2222 are N-type MOS transistors. For convenience of description, the N-type MOS transistor of the first freewheeling switch sub-module 2212 is referred to as transistor S1, and the N-type MOS transistor of the second freewheeling switch sub-module 2222 is referred to as transistor S2. At this time, the source of transistor S1 is electrically connected to the second end of the output terminal 21. The drain of transistor S1 is electrically connected to the second end of the first freewheeling winding 2211. The gate of transistor S1 is used to receive the control signal. The source of transistor S2 is electrically connected to the second end of the output terminal, the drain of transistor S2 is electrically connected to the second end of the second freewheeling winding 2221, and the gate of transistor S2 is used to receive the control signal.

[0131] It should be understood that the control signals of transistors Q1, Q2, S1, and S2 can be sent by a control device within the voltage conversion circuit or a control device outside the circuit, and are used to control the conduction and disconnection of transistors Q1, Q2, S1, and S2. At this time, the control can be performed according to the timing of transistors Q1, Q2, S1, and S2 in the conversion period.

[0132] In the above Figure 11a , Figure 11b and Figure 11c In the circuit shown, the conduction state of the energy storage module 223 in different time periods can be controlled by controlling the conduction and disconnection of transistors Q1, Q2, S1, and S2. At this time, in the first time period of the conversion period, with reference to Figure 10 As shown, that is, within the time period of 0 to Ton of the conversion period T, transistor Q1 is controlled to conduct, transistor Q2 is controlled to disconnect, transistor S1 is controlled to disconnect, and transistor S2 is controlled to conduct. At this time, as Figure 12aAs shown in the figure, the external input power supply is electrically connected to the energy storage capacitor 2231 through the Q1 transistor, providing a charging voltage to the energy storage capacitor 2231. The other end of the energy storage capacitor 2231 is electrically connected to one end of the first part of the regulating winding 2232, the other end of the first part of the regulating winding 2232 is electrically connected to one end of the second part of the regulating winding 2232, the other end of the second part of the regulating winding 2232 is electrically connected to the second end of the first freewheeling winding 2211, and the first end of the first freewheeling winding 2211 is electrically connected to the first end of the output terminal 21. That is, when the Q1 transistor is conducting and the S1 transistor is off, the external input power supply is electrically connected to the first end of the output terminal 21 through the energy storage module 223 and the first freewheeling winding 2211. At this time, when the energy storage capacitor 2231 is stable, the input power supply can provide the target voltage to the output terminal through the energy storage module 223 and the first freewheeling winding 2211. And because the Q2 is off and the S2 is conducting, therefore, the second end of the second freewheeling winding 2221 is electrically connected to the second end of the output terminal 21, and the first end of the second freewheeling winding 2221 is electrically connected to the first end of the output terminal 21. At this time, the second freewheeling winding 2221 provides the target voltage for the output terminal 21 by releasing energy. That is, in the first time period, the second freewheeling winding 2221 is in parallel with the branch where the energy storage module 223 is located, and provides the target voltage to the output terminal 21 at the same time. And because the energy storage module 223 is in parallel with the second freewheeling winding 2221, when the second freewheeling winding 2221 releases energy, an induced voltage will be generated at the second part of the regulating winding 2232 located in the same window at this time, that is, the first voltage is induced, so that the volt-second product on the first freewheeling winding 2211 can be reduced.

[0133] Reference Figure 10 As shown in the figure, in the time period of Ton~T / 2 in the third time period of the conversion cycle, the Q1 transistor is controlled to be off, the Q2 transistor is off, the S1 transistor is on, and the S2 transistor is on. As Figure 12b As shown in the figure, the energy storage module 223 is in an open circuit state, that is, the electrical connection between the energy storage capacitor 2231 in the energy storage module 223 and the input power supply is disconnected, and the electrical connection with the second end of the second freewheeling winding 2221 is also disconnected. Since the S1 is in the on state, the second end of the first freewheeling winding 2211 is electrically connected to the second end of the output terminal 21, and the first end of the first freewheeling winding 2211 is electrically connected to the first end of the output terminal 21. At this time, the first freewheeling winding 2211 can provide the target voltage for the output terminal by releasing energy. Similarly, since the S2 is in the on state, the second end of the second freewheeling winding 2221 is electrically connected to the second end of the output terminal 21, and the first end of the second freewheeling winding 2221 is electrically connected to the first end of the output terminal 21. At this time, the second freewheeling winding 2221 can provide the target voltage for the output terminal by releasing energy. That is, in the time period of Ton~T / 2 in the third time period, the first freewheeling winding 2211 and the second freewheeling winding 2221 are in parallel, and provide the target voltage for the output terminal 21 at the same time.

[0134] Reference Figure 10 As shown, during the second period of the conversion cycle, that is, within the time period of T / 2 to T / 2 + Ton of the conversion cycle T, control Q1 to turn off, Q2 to turn on, S1 to turn on, and S2 to turn off. As Figure 12c shown, the branch between the energy storage capacitor 2231 and the input power supply is disconnected, while the branch between the energy storage capacitor 2231 and the second freewheeling winding 2221 is conducted through Q2. That is, one end of the energy storage capacitor 2231 is electrically connected to the second end of the second freewheeling winding 2221, the first end of the second freewheeling winding 2221 is electrically connected to the first end of the output terminal 21, and the other end of the energy storage capacitor 2231 is electrically connected to one end of the first part of the regulating winding 2232. The other end of the first part of the regulating winding 2232 is electrically connected to one end of the second part of the regulating winding 2232. Since S1 is turned on, the other end of the second part of the regulating winding 2232 is electrically connected to the second end of the output terminal 21 through S1. That is, the energy storage module 223 is electrically connected to the first end of the output terminal 21 through the second freewheeling winding 2221 and is electrically connected to the second end of the output terminal 21 through S1. At this time, the energy storage capacitor 2231 in the energy storage module 223 discharges to provide the target voltage for the output terminal 21. The second end of the first freewheeling winding 2211 is electrically connected to the second end of the output terminal 21 through S1, and the first end of the first freewheeling winding 2211 is electrically connected to the first end of the output terminal 21. The first freewheeling winding 2211 can provide the target voltage for the output terminal 21 by releasing energy. That is, during the second period, the branch where the energy storage module 223 and the second freewheeling winding 2221 are located is in parallel with the first freewheeling winding 2211, and provides the target voltage for the output terminal 21 at the same time. And, since the energy storage module 223 is in parallel with the first freewheeling winding 2211, when the first freewheeling winding 2211 releases energy, an induced voltage will be generated at the first part of the regulating winding 2232 in the same window at this time, that is, the second voltage is induced, so that the volt-second product on the second freewheeling winding 2221 can be reduced.

[0135] Reference Figure 10 As shown, in the time period of T / 2 + Ton to T in the third period of the conversion cycle, control Q1 to turn off, Q2 to turn off, S1 to turn on, and S2 to turn on. At this time, the working process of the voltage conversion branch in the time period of Ton to T / 2 in the third period of the conversion cycle can be referred to, which will not be elaborated here.

[0136] As a possible implementation, for the convenience of implementation, the second end of the output terminal 21 is grounded, as Figure 7b shown.

[0137] As a possible implementation, in order to further reduce the current ripple in the voltage conversion circuit, at least two conversion branches are included in the voltage conversion circuit. At this time, each conversion branch is connected in parallel, and the structures of each conversion branch are the same. That is, the second ends of the first switch modules 2233 in each conversion branch are all used to externally connect to the input power supply, and the first ends of the first freewheeling modules 221 and the first ends of the second freewheeling modules 222 in each conversion branch are all electrically connected to the first end of the output terminal 21.

[0138] As a possible implementation, when at least two conversion branches 22 are included in the voltage conversion circuit, in order to reduce the area of the voltage conversion circuit, as Figure 13 shown, there are adjacent first conversion branch and second conversion branch, where the third column 245 in the first conversion branch is multiplexed as the second column 243 in the second conversion branch. That is, a column is shared among adjacent conversion branches as the third column 245 in one conversion branch and the second column 243 in the other conversion branch.

[0139] It should be noted that the second column 243 included in Figure 13 the first conversion branch described above can be the third column 245 of other multiplexed conversion branches, or the second column included in the first conversion branch. This application does not limit this.

[0140] As a possible implementation, when at least two conversion branches are included in the voltage conversion circuit, in order to further reduce the area of the voltage conversion circuit, as Figure 14 shown, when the conversion branch 22 includes at least two paths, there are adjacent third conversion branch and fourth conversion branch, where the first column 241 in the third conversion branch is multiplexed as the second column 243 of the fourth conversion branch, and the first column 241 in the fourth conversion branch is multiplexed as the third column 245 of the third conversion branch.

[0141] At this time, in order to ensure the normal operation of the adjacent third conversion branch and fourth conversion branch, when the energy storage module 223 in the third conversion branch is in the first conduction state, the energy storage module 223 in the fourth conversion branch is in the second conduction state.

[0142] Corresponding to the above embodiments, the present application also provides a power supply module, as Figure 15 shown, this power supply module includes the voltage conversion circuit described in the above embodiments.

[0143] In some embodiments, the conversion of different target voltages can be achieved through multiple power modules. Exemplarily, the voltage required by the first load is the first target voltage, and the voltage required by the second load is the second target voltage, and the first target voltage is greater than the second target voltage. At this time, the conversion of different target voltages can be achieved through two voltage modules. That is, through the first power module, the input power supply voltage is converted into the first target voltage to supply power to the first load, and through the second power module, the first target voltage is converted into the second target voltage to supply power to the second load, as Figure 16 shown.

[0144] Corresponding to the above embodiments, the present application also provides an electronic device, which includes the voltage conversion circuit or the power module described in the above embodiments.

[0145] Those skilled in the art can clearly understand that the technology in the embodiments of the present invention can be implemented by means of software plus a necessary general hardware platform. Based on such an understanding, the technical solutions in the embodiments of the present invention, in essence, or the part that contributes to the prior art can be embodied in the form of a software product. This computer software product can be stored in a storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in various embodiments or some parts of the embodiments of the present invention.

[0146] For the same and similar parts among the various embodiments in this specification, reference can be made to each other. In particular, for the device embodiments and the terminal embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts can be referred to the description in the method embodiments.

Claims

1. A voltage conversion circuit, characterized in that, Comprising: An output terminal and at least one conversion branch; The conversion branch comprises: A first freewheeling module, the first freewheeling module comprising a first freewheeling winding; a first end of the first freewheeling winding is electrically connected to a first end of the output terminal and is configured to output a target voltage to the output terminal; A second freewheeling module, the second freewheeling module comprising a second freewheeling winding; a first end of the second freewheeling winding is electrically connected to a first end of the output terminal and is configured to output a target voltage to the output terminal; An energy storage module, the energy storage module comprising an energy storage capacitor, a first part of an adjustment winding and a second part of the adjustment winding connected in series with each other; the first freewheeling winding, the second freewheeling winding and the adjustment winding are located on the same magnetic core; Wherein, in a first time period, the energy storage module is in a first conduction state for outputting a target voltage through the first freewheeling winding; when in the first conduction state, the energy storage module is connected in series with a second end of the first freewheeling winding and is connected in parallel with the second freewheeling winding, and a second part of the adjustment winding generates a first voltage based on the second freewheeling winding; In a second time period, the energy storage module is in a second conduction state for outputting a target voltage through the second freewheeling winding; when in the second conduction state, the energy storage module is connected in series with a second end of the second freewheeling winding and is connected in parallel with the first freewheeling winding, and a first part of the adjustment winding generates a second voltage based on the first freewheeling winding; In a third time period, the energy storage module is in an open circuit state; the third time period is other time in a preset conversion period except the first time period and the second time period.

2. The circuit according to claim 1, wherein The adjustment winding is wound around a first column of the magnetic core; The first part of the adjustment winding is the part of the adjustment winding located in a first window; the first window is in the magnetic core and is located between the first column and a second column, and the first column and the second column are two adjacent columns in the magnetic core; The second part of the adjustment winding is the part of the adjustment winding located in a second window; the second window is in the magnetic core and is located between the first column and a third column, and the third column is adjacent to the first column in the magnetic core and is different from the second column.

3. The circuit according to claim 2, characterized in that, The first freewheeling winding is located in the first window; the second freewheeling winding is located in the second window.

4. The circuit according to claim 3, characterized in that, The first freewheeling module further comprises a first freewheeling switch sub-module, one end of the first freewheeling switch sub-module is electrically connected to a second end of the first freewheeling winding; the other end of the first freewheeling switch sub-module is electrically connected to a second end of the output terminal; wherein, in the second time period and the third time period, the first freewheeling switch sub-module is in a conduction state, and in the first time period, the first freewheeling switch sub-module is in an open state.

5. The circuit according to claim 3, wherein The second freewheeling module further includes a second freewheeling switch sub-module, one end of the second freewheeling switch sub-module is electrically connected to the second end of the second freewheeling winding; the other end of the second freewheeling switch sub-module is electrically connected to the second end of the output terminal; wherein, in the first time period and the third time period, the second freewheeling switch sub-module is in a conducting state, and in the second time period, the second freewheeling switch sub-module is in a disconnected state.

6. The circuit according to any one of claims 2-5, characterized in that, The energy storage module further includes a first switch module and a second switch module; The first end of the first switch module is electrically connected to the energy storage capacitor, and the second end of the first switch module is used to externally connect to the first end of the input power supply; the second end of the output terminal is used to externally connect to the second end of the input power supply; The first end of the second switch module is electrically connected to the energy storage capacitor, and the second end of the second switch module is electrically connected to the second end of the second freewheeling winding; In the first time period, the energy storage module being in a first conducting state includes: In the first time period, the first switch module is in a conducting state, and the second switch module is in a disconnected state; In the second time period, the energy storage module being in a second conducting state includes: In the second time period, the first switch module is in a disconnected state, and the second switch module is in a conducting state; In the third time period, the energy storage module being in an open circuit state includes: In the third time period, the first switch module is in a disconnected state, and the second switch module is in a disconnected state.

7. The circuit according to any one of claims 1-6, characterized in that The number of turns of the first freewheeling winding and the second freewheeling winding is the same.

8. The circuit according to any one of claims 2-6, characterized in that, When the conversion branch includes at least two paths, there are adjacent first conversion branches and second conversion branches, wherein the third column in the first conversion branch is multiplexed as the second column in the second conversion branch.

9. The circuit according to any one of claims 2-6, characterized in that, When the conversion branch includes at least two paths, there are adjacent third conversion branches and fourth conversion branches, wherein the first column in the third conversion branch is multiplexed as the second column in the fourth conversion branch, and the first column in the fourth conversion branch is multiplexed as the third column in the third conversion branch.

10. The circuit according to claim 9, wherein When the energy storage module in the third conversion branch is in the first conducting state, the energy storage module in the fourth conversion branch is in the second conducting state.

11. A power supply module, characterized in that, Including the voltage conversion circuit according to any one of claims 1-10.

12. An electronic device, characterized in that, Including the voltage conversion circuit according to any one of claims 1-10 or including the power supply module according to claim 11.

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