Conversion circuit, charging module and electronic equipment

Abstract

The invention provides a conversion circuit. The conversion circuit comprises an output filtering unit, a rectifying unit, a main transformer, a high-frequency inverter circuit and a switching circuit unit. The output filtering unit comprises a capacitor and a filtering inductor; the rectifying unit is connected with the output filtering unit and comprises at least two commutator units, each commutator unit comprises a diode rectifying unit, and the dotted terminal of each winding group of the filtering inductor is connected with the output negative end of each rectifying unit; the main transformer comprises an output side and an input side, the output side at least comprises two secondary windings, each secondary winding is connected with each commutator unit, the input side at least comprises a primary winding, and the position of the primary winding corresponds to the position of the secondary winding; and the high-frequency inverter circuit is connected with the primary winding. By simultaneously switching the series connection state and the parallel connection state of the rectification unit and the filter inductor, the wide power range is realized, the power loss and the thermal stress of the filter inductor are reduced, and the conversion efficiency is improved.

Description

Technical Field

[0001] The present application belongs to the field of electronic technology, and in particular relates to a conversion circuit, a charging module and an electronic device. Background Art

[0002] Charging modules such as electric vehicle charging piles are developing towards high voltage, high current, wide constant power range and high power density. Taking the traditional conversion circuit as an example, the main transformer and secondary side in the electric vehicle charging module generally have two windings, which are connected to multiple diode rectifier outputs, and then the series and parallel connection of these multiple diode rectifier outputs is realized through the relay series-parallel switching circuit to output high voltage and high current, and achieve a wider constant power range.

[0003] However, the magnetic devices used to achieve high voltage, high current, and wide constant power range output are often large in size, high in loss, and have prominent thermal stress risks. Therefore, optimizing losses and thermal stress is very critical. Summary of the invention

[0004] The technical problem to be solved by the present application is to provide a conversion circuit, aiming to solve the problems of high output filter inductance loss and prominent thermal stress risk.

[0005] In order to solve the above technical problems, the present application is implemented through the following technical solutions:

[0006] In a first aspect, an embodiment of the present application provides a conversion circuit, including:

[0007] An output filter unit, comprising a capacitor and a filter inductor, wherein the capacitor and the filter inductor are connected;

[0008] A rectifier unit, connected to the output filter unit, and comprising at least two rectifier units, each of which comprises a diode rectifier unit, and the rectifier units include a series state and a parallel state, wherein the same-name ends of each winding group of the filter inductor are connected to the output negative end of each rectifier unit;

[0009] A main transformer, comprising an output side and an input side, wherein the output side comprises at least two secondary windings, the number of the secondary windings is the same as the number of the rectifier units, and each of the secondary windings is connected to each of the rectifier units, and the input side comprises at least one primary winding, the position of the primary winding corresponds to the position of the secondary winding;

[0010] A high-frequency inverter circuit connected to the primary winding;

[0011] A switching circuit unit is used to control the series connection or parallel connection of the filter inductor and the diode rectifier unit, wherein the series state refers to the series connection of the rectifier units in the rectifier unit, and the parallel state refers to the parallel connection of the rectifier units in the rectifier unit.

[0012] Furthermore, the switching circuit unit includes:

[0013] at least one first connection line, each of the first connection lines being connected between two adjacent rectifier units, and the first connection line being located on a side of the diode rectifier unit close to the capacitor;

[0014] A switching switch is provided on the first connecting line and the second connecting line connecting each rectifier unit and the capacitor.

[0015] Furthermore, the filter inductor comprises at least two winding groups, each of the winding groups is arranged on the second connecting line, and the at least two winding groups share the same magnetic core; or

[0016] The filter inductor comprises a winding group, one end of which is connected to the output filter unit, the other end of which is connected to the rectifier unit, and is located between the second connecting line and the output filter unit.

[0017] Furthermore, the filter inductor comprises at least two magnetic core columns, at least two magnetic cover plates, and at least two winding groups;

[0018] Each of the winding sets is wound around each of the magnetic core middle columns, and each of the magnetic cover plates is connected to one end of two adjacent magnetic core middle columns;

[0019] Wherein, when the rectifying unit is in a series state, the at least two winding groups are connected in series, and when the rectifying unit is in a parallel state, the at least two winding groups are connected in parallel.

[0020] Furthermore, the number of the rectifier unit, the magnetic core center column, the magnetic cover plate and the winding group is two.

[0021] Furthermore, each of the winding groups has the same number of winding coils.

[0022] Furthermore, the filter inductor comprises a magnetic ring and at least two winding groups, and at least two winding groups are both wound around the magnetic ring.

[0023] Furthermore, the filter inductor comprises at least two winding groups, and each of the winding groups is connected in series with the diode rectifier unit;

[0024] The switch unit is used to simultaneously control the at least two winding groups and the diode rectifier unit to be connected in series or in parallel.

[0025] In a second aspect, an embodiment of the present application provides a charging module, comprising a conversion circuit as described in any one of the above embodiments, and a controller, wherein the controller is connected to a switching circuit unit of the conversion circuit to control the switching circuit unit.

[0026] In a third aspect, an embodiment of the present application provides an electronic device, characterized in that it includes a charging module as described in the above embodiment.

[0027] Compared with the prior art, the conversion circuit in the present application has the beneficial effect that: the conversion circuit includes an output filter unit, a rectification unit, a main transformer, a high-frequency inverter circuit and a switching circuit unit. The output filter unit includes a capacitor and a filter inductor, and the capacitor and the filter inductor are connected; the rectifier unit is connected to the output filter unit and includes at least two rectifier units, each rectifier unit includes a diode rectifier unit, the rectifier unit includes a series state and a parallel state, and the same-name ends of each winding group of the filter inductor are connected to the output negative end of each rectifier unit; the main transformer includes an output side and an input side, the output side includes at least two secondary windings, the number of the secondary windings is the same as the number of the rectifier units, and each secondary winding is connected to each rectifier unit, and the input side includes at least one primary winding, and the position of the primary winding corresponds to the position of the secondary winding; the high-frequency inverter circuit is connected to the primary winding; the switching circuit unit is used to control the series or parallel connection of the filter inductor and the diode rectifier unit. This filter inductor and its series and parallel switching conversion circuit greatly reduce the copper loss of the filter inductor when outputting a large current and the magnetic loss when outputting a high voltage, reduce the local overheating temperature of the filter inductor, reduce the risk of thermal stress, thereby improving the efficiency of the whole machine and widening the constant power range. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a schematic diagram of the overall structure of a conversion circuit in one embodiment of the present application;

[0029] Figure 2 It is a schematic diagram of the overall structure of the conversion circuit in this application;

[0030] Figure 3 is a schematic diagram of the overall structure of a conversion circuit in another embodiment of the present application;

[0031] Figure 4 It is a schematic diagram of the overall structure of the conversion circuit in this application;

[0032] Figure 5 is a schematic diagram of the structure of a filter inductor in an embodiment of the present application;

[0033] Figure 6 It is a schematic diagram of the structure of a filter inductor in another embodiment of the present application.

[0034] In the accompanying drawings, the various reference numerals represent: 1. output filter unit; 11. capacitor; 12. filter inductor; 121. winding group; 122. core center column; 123. magnetic cover; 124. magnetic ring; 2. rectifier unit; 21. rectifier unit; 3. main transformer; 31. secondary winding; 32. primary winding; 4. high-frequency inverter circuit; 5. switching circuit unit; 51. first connecting line; 52. second connecting line; 53. switching switch; 531. first switching switch; 532. second switching switch. DETAILED DESCRIPTION

[0035] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0036] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "circumferential", "radial" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0037] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0038] The secondary side of the main transformer in the electric vehicle charging module generally has two windings, which are connected to the output of multiple diode rectifiers, and then the series and parallel connection of these multiple diode rectifier outputs is realized through the relay series-parallel switching circuit to output high voltage and high current to achieve a wide constant power range. However, the magnetic devices used in the existing conversion circuits to achieve high voltage, high current, and wide constant power range output are often large in size, high in loss, and have prominent thermal stress risks.

[0039] In order to solve the above-mentioned technical problems, the present application proposes a conversion circuit, which aims to solve the problems of high output filter inductance loss and prominent thermal stress risk.

[0040] As attached Figure 1 As shown in FIG. 1 , it is a schematic diagram of the overall structure of the conversion circuit in one embodiment of the present application; Figure 2 As shown in FIG. 1 , it is a schematic diagram of the overall structure of the conversion circuit in another embodiment of the present application; Figure 3 As shown in FIG. 1 , it is a schematic diagram of the overall structure of the conversion circuit in another embodiment of the present application; Figure 4 FIG. 1 is a schematic diagram of the overall structure of a conversion circuit in another embodiment of the present application. Figure 1-4 It can be seen that the conversion circuit of the present application includes an output filter unit 1 , a rectifier unit 2 , a main transformer 3 , a high-frequency inverter circuit 4 and a switching circuit unit 5 .

[0041] In some embodiments, as shown in the attached Figure 2-3 As shown, the output filter unit 1 includes a capacitor 11 and a filter inductor 12, and the capacitor 11 and the filter inductor 12 are connected. The output filter unit 1 is mainly used to filter the voltage and current of the conversion circuit. The capacitor 11 uses the characteristic that the voltage of the capacitor 11 cannot change suddenly, and for high-frequency signals, the impedance of the capacitor 11 is low, and the noise signal on the signal line can be bypassed, thereby achieving the filtering effect. The filter inductor 12 is used to filter the current in the circuit so that the output current reaches a stable state.

[0042] As attached Figure 1-4 As shown, the rectifier unit 2 is connected to the output filter unit 1, and includes at least two rectifier units 21, each rectifier unit 21 includes a diode rectifier unit, and the rectifier unit 2 includes a series state and a parallel state, wherein the filter inductor 12 is connected to the output positive terminal or the output negative terminal of the rectifier unit 2. The rectifier unit 2 uses the unidirectional conductivity of the diode to convert the positive and negative alternating voltage into a unidirectional pulsating voltage circuit. Under the action of the AC power supply, the diode rectifier unit is periodically turned on and off, so that the load obtains pulsating direct current. The rectifier unit is generally a half-bridge or full-bridge diode rectifier, and the output of the rectifier unit is a consistent pulsating DC voltage waveform when the AC power supply is input in the positive half cycle and the negative half cycle.

[0043] As attached Figure 1-4 As shown, the main transformer 3 includes an output side and an input side, the output side includes at least two secondary windings 31, the number of the secondary windings 31 is the same as the number of the rectifier units 21, and each secondary winding 31 is connected to each rectifier unit 21, and the input side includes at least one primary winding 32, the position of the primary winding 32 corresponds to the position of the secondary winding 31. The main transformer 3 uses the principle of electromagnetic induction between the primary winding 32 and the secondary winding 31 to change the voltage, current and impedance of the circuit.

[0044] The high-frequency inverter circuit 4 is connected to the primary winding 32. The high-frequency inverter circuit 4 inverts the direct current into high-frequency alternating current through high-frequency DC / AC conversion technology, and then transforms it through a high-frequency transformer, and then rectifies it into stable direct current through a high-frequency rectifier and filter circuit.

[0045] The switching circuit unit 5 is used to control the series or parallel connection of the filter inductor and the diode rectifier unit. The series state refers to the series connection of the rectifier unit 21 in the rectifier unit 2, and the parallel state refers to the parallel connection of the rectifier unit 21 in the rectifier unit 2. In order to broaden the constant power range, the series and parallel switching circuits of the switching circuit unit 5 can realize the series and parallel output of multiple diode rectifier units. When multiple diode rectifier units are output in series, a constant power output of multiple voltages is realized; when multiple diode rectifier units are output in parallel, a constant power output of multiple currents is realized. Multiple diode rectifier units 2 can be combined into a constant power output of multiple voltages or currents of different multiples. Such a setting has great benefits for the selection of diode rectifier units. For example, the selection requirements of diode rectifier units can be reduced, and there is no need to require diode rectifier units of fixed specifications.

[0046] As the technical solution in the above embodiment, the conversion circuit in the embodiment of the present application includes an output filter unit 1, a rectifier unit 2, a main transformer 3, a high-frequency inverter circuit 4 and a switching circuit unit 5. The output filter unit 1 includes a capacitor 11 and a filter inductor 12; the rectifier unit 2 is connected to the output filter unit 1 and includes at least two rectifier units 21, each rectifier unit 21 includes a diode rectifier unit, and the rectifier unit 2 includes a series state and a parallel state. The same-name ends of each winding group of the filter inductor are connected to the output negative end of each rectifier unit. The same-name ends of each winding group of the filter inductor can also be connected to the input positive end of each rectifier unit. The main transformer 3 includes an output side and an input side. The output side includes at least two secondary windings 31, and each secondary winding 31 is connected to each rectifier unit 21. The input side includes at least one primary winding 32, and the position of the primary winding 32 corresponds to the position of the secondary winding 31. The high-frequency inverter circuit 4 is connected to the primary winding 32. The switching circuit unit 5 is used to switch the series state and the parallel state of the rectifier unit 2. This filter inductor and its series and parallel switching conversion circuit greatly reduce the copper loss of the filter inductor when outputting large current and the magnetic loss when outputting high voltage, reduce the local overheating temperature of the filter inductor, reduce the risk of thermal stress, thereby improving the efficiency of the whole machine and widening the constant power range.

[0047] As attached Figure 2As shown, in some embodiments, the switching circuit unit 5 includes at least one first connection line 51, a switch 53 and a second connection line 52. Each first connection line 51 is connected between two adjacent rectifier units 21, and the first connection line 51 is located on the side of the diode rectifier unit close to the capacitor 11. The first connection line 51 and the second connection line 52 connecting each rectifier unit 21 and the capacitor 11 are provided with a switch 53. For the convenience of description, the switch 53 on the first connection line 51 is referred to as the first switch 531, and the switch 53 on the second connection line 52 is referred to as the second switch 532. When the first switch 531 is closed and the second switch 532 is disconnected, at least two diode rectifier units and the output filter unit 1 simultaneously form a series relationship, and the rectifier unit 2 is in a series state. When the first switch 531 is disconnected and the second switch 532 is closed, the two diode rectifier units and the output filter unit 1 simultaneously form a parallel relationship, and the rectifier unit 2 is in a parallel state. The switching switch 53 can be a relay having a control system and a controlled system. The relay uses a smaller current to control a larger current, which is an "automatic switch" and can realize the automation of switch closing and opening without manual control of the switch closing and opening.

[0048] As attached Figure 2-4 As shown, in some embodiments, the filter inductor 12 includes at least two winding groups 121, each winding group 121 is arranged on the second connecting line 52, and at least two winding groups share the same magnetic core. Specifically, when the first switching switch 531 is closed and the second switching switch 532 is disconnected, at least two diode rectifier units and at least two winding groups 121 of the filter inductor 12 simultaneously form a series relationship, and the rectifier unit 2 is in a series state at this time. That is, in the series state, at least two winding groups 121 are connected in series as a whole winding group 121, that is, the total number of turns of the whole winding group 121 is doubled by at least two times, and the voltage borne by the whole winding group 121 is only a part of the parallel state, and the magnetic density change is also only a part. When the first switching switch 531 is disconnected and the second switching switch 532 is closed, at least two diode rectifier units and at least two windings of the filter inductor 12 simultaneously form a parallel relationship, and the rectifier unit 2 is in a parallel state at this time. That is, in the parallel state, the number of turns of the independent winding group 121 is reduced, so that the large parallel current is divided into at least two winding groups 121, and the current of each winding is only a part of the total current. The total parallel DC resistance is reduced, which greatly reduces the copper loss of the filter inductor 12 when the output is parallel.

[0049] As attached Figure 2-3As shown, in some embodiments, the filter inductor 12 includes at least two winding groups 121, and each winding group 121 is arranged on the second connecting line 52. Taking the filter inductor 12 including two winding groups 121 as an example, in the series state, the two winding groups 121 are connected in series as a whole winding group 121, that is, the total number of turns of the whole winding group 121 is doubled. At this time, the voltage borne by the whole winding group 121 is only half of that in the parallel state, and the change in magnetic density is also only half. In the parallel state, the number of turns of the independent winding group 121 is reduced, so that the large parallel current is shunted to the two winding groups 121, and the current of each winding is only half of the total current.

[0050] As attached Figure 4 As shown, in some embodiments, the filter inductor 12 includes a winding set 121, one end of the winding set 121 is connected to the output filter unit 1, the other end is connected to the rectifier unit 2, and is located between the second connecting line 52 and the output filter unit 1. Only one winding set 121 is used to filter the current ripple of the circuit, which can achieve current filtering and reduce the cost of the conversion circuit.

[0051] In some embodiments, the filter inductor 12 includes at least two magnetic core columns 122, at least two magnetic cover plates 123, and at least two winding groups 121. Each winding group 121 is wound around each magnetic core column 122, and each magnetic cover plate 123 connects one end of two adjacent magnetic core columns 122. In this way, at least two magnetic core columns 122, at least two magnetic cover plates 123, and at least two winding groups 121 are magnetically integrated to form the filter inductor 12. When the rectifier unit 2 is in a series state, at least two winding groups 121 are connected in series, and when the rectifier unit 2 is in a parallel state, at least two winding groups 121 are connected in parallel. By treating all the winding groups 121 of the filter inductor 12 as a whole, the volume of the filter inductor 12 can be reduced, thereby reducing the volume of the conversion circuit. As shown in the attached figure Figure 5As shown, the number of rectifier units 2, magnetic core middle column 122, magnetic cover plate 123 and winding group 121 are all two, and the number of winding turns of each winding group 121 is the same. When the first switching switch 531 is closed and the second switching switch 532 is disconnected, the two diode rectifier units and the two windings of the filter inductor 12 simultaneously form a series relationship. That is, in the series state, the total number of turns of all winding groups 121 of the filter inductor 12 as a whole solution is doubled, and the voltage borne by a single winding is only half of that when the two winding groups 121 of the filter inductor 12 are in parallel state, and the change in magnetic density is also only half of that. Moreover, since the volume of the magnetic core of the magnetic integration is smaller than that of the two independent filter inductors 12, the magnetic loss in the output series state is greatly reduced. When the first switching switch 531 is disconnected and the second switching switch 532 is closed, the two diode rectifier units and the two windings of the filter inductor 12 simultaneously form a parallel relationship. That is, in the parallel state, all winding groups 121 of the filter inductor 12 are used as a whole solution to show the same characteristics as two independent filter inductors 12, so that the large parallel current is divided into two windings, and the current of each winding is only half of the total current. The total parallel DC resistance of the filter inductor 12 windings is reduced, which greatly reduces the copper loss of the filter inductor 12 when the output is parallel.

[0052] As attached Figure 5 As shown, there are two winding groups 121, one of which has port a and port b, and the other has port c and port d. Port a is connected to port d, and port b is connected to port c, so that the two winding groups form a parallel relationship; port b is connected to port c, so that the two winding groups form a series relationship.

[0053] Through the technical solutions in the above embodiments, in the embodiments of the present application, all winding groups 121 of the filter inductor 12 are used as a whole and the series and parallel switching circuit topology can greatly reduce the magnetic loss at high voltage and the copper loss at high current. Compared with the solution of two independent winding groups 121, since the winding groups 121 in the embodiments of the present application generate magnetic flux and share the same magnetic core loop, part of the magnetic core is omitted, the volume of the inductor can be made smaller, the manufacturing cost is lower, the space occupied is smaller, and the power density is higher.

[0054] The filter inductor adopts a multi-winding magnetic integration solution. Compared with the solution of using multiple independent non-coupled filter inductors, it saves core materials and reduces manufacturing costs on the one hand, and reduces the occupied space and improves power density on the other hand.

[0055] In some embodiments, each winding group 121 has the same number of winding turns, which ensures that when in series, the voltage borne by a single winding is only one-Nth of the voltage when the filter inductor 12N winding groups 121 are in parallel, and the change in magnetic density is also only one-Nth; when in parallel, the number of turns of the independent winding group 121 is reduced, so that the large parallel current is diverted to the N winding groups 121, and the current of each winding is only one-Nth of the total current.

[0056] As attached Figure 6 As shown, in some embodiments, the filter inductor 12 includes a magnetic ring 124 and at least two winding groups 121, and the at least two winding groups 121 are both wound around the magnetic ring 124. The connection structure between the magnetic ring 124 and the at least two winding groups 121 is relatively simple, and the assembly speed of the filter inductor 12 can be improved. Similarly, when the first switching switch 531 is closed and the second switching switch 532 is disconnected, the two diode rectifier units and the at least two winding groups 121 of the filter inductor 12 simultaneously form a series relationship, and the rectifier unit 2 is in a series state at this time. That is, in the series state, at least two winding groups 121 are connected in series as a whole winding group 121, that is, the total number of turns of the whole winding group 121 is doubled by at least two times, and at this time, the voltage borne by the whole winding group 121 is only a part of that in the parallel state, and the magnetic density change is also only a part. When the first switch 531 is disconnected and the second switch 532 is closed, at least two diode rectifier units and at least two windings of the filter inductor 12 are connected in parallel at the same time, and the rectifier unit 2 is in a parallel state. That is, in the parallel state, the number of turns of the independent winding group 121 is reduced, so that the large parallel current is shunted to at least two winding groups 121, and the current of each winding is only a part of the total current. The total parallel DC resistance is reduced, which greatly reduces the copper loss of the filter inductor 12 when the output is in parallel.

[0057] Furthermore, based on the design that the filter inductor 12 includes a magnetic ring 124 and at least two winding groups 121, and at least two winding groups 121 are both wound around the magnetic ring 124, the number of winding groups 121 is two, that is, both winding groups 121 are wound around the magnetic ring 124. Similarly, in the series state, the total number of turns of all winding groups 121 of the filter inductor 12 as a whole solution is doubled, and the voltage borne by a single winding is only half of that in the parallel state of the two winding groups 121 of the filter inductor 12, and the change in magnetic density is also only half of that, and because the volume of the magnetic core of the magnetic integration is smaller than that of the two independent filter inductors 12, the magnetic loss in the output series state is greatly reduced. When the first switching switch 531 is disconnected and the second switching switch 532 is closed, the two diode rectifier units and the two windings of the filter inductor 12 simultaneously form a parallel relationship. That is, in the parallel state, all winding groups 121 of the filter inductor 12 are used as a whole solution to show the same characteristics as two independent filter inductors 12, so that the large parallel current is divided into two windings, and the current of each winding is only half of the total current. The total parallel DC resistance of the filter inductor 12 windings is reduced, which greatly reduces the copper loss of the filter inductor 12 when the output is parallel.

[0058] As attached Figure 6 As shown, there are two winding groups 121, one of which has port a and port b, and the other has port c and port d. Port a is connected to port d, and port b is connected to port c, so that the two winding groups form a parallel relationship; port b is connected to port c, so that the two winding groups form a series relationship.

[0059] In one embodiment, the filter inductor 12 includes at least two winding groups 121, each winding group 121 is connected in series with a diode rectifier unit, and is used to filter the current in the circuit so that the output current reaches a stable state. The switch switching unit is used to control the at least two winding groups 121 to be connected in series or in parallel. The specific structure of the switching switch 53 unit is not limited here, and it is sufficient to realize that at least two winding groups 121 are connected in series or in parallel.

[0060] The embodiment of the present application further provides a charging module, comprising a conversion circuit as described in any one of the above embodiments, and a controller, wherein the controller is connected to the switching circuit unit 5 of the conversion circuit to control the switching circuit unit 5. The structure and beneficial effects of the conversion circuit have been described in detail in the above embodiments. Since the charging module includes the conversion circuit, it also includes the structure and beneficial effects in the above embodiments, and the conversion circuit is not described in detail here.

[0061] The present application also provides an electronic device, which includes the charging module described in the above embodiment, and the charging module includes a conversion circuit. The structure and beneficial effects of the conversion circuit have been described in detail in the above embodiment. Since the charging module includes the conversion circuit, the electronic device also includes the structure and beneficial effects of the above embodiment, and the conversion circuit is not described in detail here. The electronic device includes a car charging pile, a robot charging pile, etc.

[0062] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A conversion circuit, characterized in that: include: An output filter unit, comprising a capacitor and a filter inductor, wherein the capacitor and the filter inductor are connected; A rectifier unit, connected to the output filter unit, and comprising at least two rectifier units, each of which comprises a diode rectifier unit, and the rectifier units include a series state and a parallel state, wherein the same-name ends of each winding group of the filter inductor are connected to the output negative end of each rectifier unit; A main transformer, comprising an output side and an input side, wherein the output side comprises at least two secondary windings, the number of the secondary windings is the same as the number of the rectifier units, and each of the secondary windings is connected to each of the rectifier units, and the input side comprises at least one primary winding, the position of the primary winding corresponds to the position of the secondary winding; A high-frequency inverter circuit connected to the primary winding; A switching circuit unit is used to control the series connection or parallel connection of the filter inductor and the diode rectifier unit, wherein the series state refers to the series connection of the rectifier units in the rectifier unit, and the parallel state refers to the parallel connection of the rectifier units in the rectifier unit.

2. The conversion circuit according to claim 1, characterized in that: The switching circuit unit comprises: at least one first connection line, each of the first connection lines being connected between two adjacent rectifier units, and the first connection line being located on a side of the diode rectifier unit close to the capacitor; A switching switch is provided on the first connecting line and the second connecting line connecting each rectifier unit and the capacitor.

3. The conversion circuit according to claim 2, characterized in that: The filter inductor comprises at least two winding groups, each of the winding groups is arranged on the second connecting line, and the at least two winding groups share the same magnetic core; or The filter inductor comprises a winding set, one end of which is connected to the output filter unit, the other end of which is connected to the rectifier unit, and the winding set is located between the second connecting line and the output filter unit.

4. The conversion circuit according to claim 2, characterized in that: The filter inductor comprises at least two magnetic core columns, at least two magnetic cover plates, and at least two winding groups; Each of the winding sets is wound around each of the magnetic core middle columns, and each of the magnetic cover plates is connected to one end of two adjacent magnetic core middle columns; Wherein, when the rectifying unit is in a series state, the at least two winding groups are connected in series, and when the rectifying unit is in a parallel state, the at least two winding groups are connected in parallel.

5. The conversion circuit according to claim 4, characterized in that: The number of the rectifier unit, the magnetic core center column, the magnetic cover plate and the winding group are all two.

6. The conversion circuit according to claim 4, characterized in that: Each of the winding sets has the same number of winding coils.

7. The conversion circuit according to claim 2, characterized in that: The filter inductor comprises a magnetic ring and at least two winding groups, and the at least two winding groups are both wound around the magnetic ring.

8. The conversion circuit according to claim 1, characterized in that: The filter inductor comprises at least two winding groups, each of which is connected in series with the diode rectifier unit; The switch unit is used to simultaneously control the at least two winding groups and the diode rectifier unit to be connected in series or in parallel.

9. A charging module, characterized in that: It comprises a conversion circuit as claimed in any one of claims 1 to 8, and a controller, wherein the controller is connected to a switching circuit unit of the conversion circuit to control the switching circuit unit.

10. An electronic device, characterized in that: Comprising the charging module as claimed in claim 9.

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