Conversion circuit

Abstract

The utility model relates to a conversion circuit, which comprises a voltage source, an input bus capacitor, a primary side conversion circuit, a transformer, a rectifying and filtering combined switching circuit, an interlocking switching circuit and an output bus capacitor, and is characterized in that the input bus capacitor is respectively connected with the voltage source and the primary side conversion circuit; the primary conversion circuit is connected with the transformer; the transformer is connected with the rectifying and filtering combined switching circuit; the rectifying and filtering combined switching circuit is connected with the interlocking switching circuit; the first output rectifying circuit is respectively connected with the secondary winding and the first filter circuit, and the second output rectifying circuit is respectively connected with the secondary winding and the second filter circuit; and the interlocking switching circuit is connected with the output bus capacitor. The filter circuit is arranged at the front end of the interlocking switching circuit, so that the output current is consistent when the first output rectifying circuit and the second output rectifying circuit output in parallel, the overcurrent risk caused by non-uniform current of the two paths is avoided, and the working stability of the power supply module is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of power supply, concretely relates to a conversion circuit. BACKGROUND

[0002] At present, the modular charging power supply mainly has two-stage topological architecture, which is divided into a front-stage AC / DC circuit and a rear-stage DC / DC circuit. The front-stage AC / DC circuit mainly realizes the AC / DC conversion function of power factor correction, and the current three-phase Vienna topological technical scheme is mainly adopted. The rear-stage DC / DC circuit mainly realizes the functions of electrical isolation and DC voltage conversion. However, the current DC / DC conversion circuit has the problem of extremely uneven current when two groups of output loops are in parallel output, and there is a risk of device overcurrent failure, and the stability of the power module is poor. SUMMARY

[0003] The utility model embodiment provides a kind of conversion circuit, and the utility model embodiment utility model provides a kind of conversion circuit, by being designed in the front end of interlock switching circuit with filter circuit, it can be realized that the output current is consistent when first output rectifier circuit and second output rectifier circuit are in parallel output, avoid the overcurrent risk caused by two-way uneven current, it is favorable to improve the stability of power module work.

[0004] In a first aspect, the utility model embodiment provides a kind of conversion circuit, and conversion circuit includes:

[0005] Voltage source;

[0006] Input bus capacitor, the input bus capacitor is connected voltage source and primary side conversion circuit respectively;

[0007] The primary side conversion circuit, the primary side conversion circuit is connected transformer;

[0008] The transformer, the transformer is connected rectification filter combination switching circuit;The transformer includes primary winding and secondary winding, the primary side conversion circuit is connected the primary winding, and the secondary winding is connected the rectification filter combination switching circuit;

[0009] The rectification filter combination switching circuit, the rectification filter combination switching circuit is connected interlock switching circuit;The rectification filter combination switching circuit includes first output rectifier circuit, second output rectifier circuit, first filter circuit and second filter circuit;The first output rectifier circuit is connected the secondary winding and the first filter circuit respectively, and the second output rectifier circuit is connected the secondary winding and the second filter circuit respectively;

[0010] The interlock switching circuit, the interlock switching circuit is connected output bus capacitor;

[0011] The output bus capacitor.

[0012] Optionally, the primary side conversion circuit comprises a first switch tube, a second switch tube, a third switch tube, a fourth switch tube, a first inductor and a first capacitor; the transformer comprises a first switch, the primary side winding comprises a first sub-primary side winding and a second sub-primary side winding, and the secondary side winding comprises a first sub-secondary side winding and a second sub-secondary side winding;

[0013] The first end of the first switch tube is connected to the first end of the input bus capacitor and the first end of the third switch tube respectively, the second end of the first switch tube is connected to the first end of the second switch tube and the first end of the first inductor respectively, the second end of the second switch tube is connected to the second end of the input bus capacitor and the second end of the fourth switch tube respectively, the second end of the third switch tube is connected to the first end of the fourth switch tube and the second end of the second sub-primary side winding respectively, the first inductor is connected to the first end of the first capacitor, the second end of the first capacitor is connected to the first fixed end of the first switch, the first movable end of the first switch is connected to the first end of the first sub-primary side winding, and the second movable end of the first switch is connected to the second end of the first sub-primary side winding and the first end of the second sub-primary side winding respectively.

[0014] Optionally, the interlocking switching circuit comprises a second switch and a third switch, the second fixed end of the second switch is connected to the first output rectification circuit, the third movable end of the second switch is connected to the fifth movable end of the third switch, the fourth movable end of the second switch is connected to the second end of the output bus capacitor, the third fixed end of the third switch is connected to the second filter circuit, and the sixth movable end of the third switch is connected to the first end of the output bus capacitor.

[0015] Optionally, the interlocking switching circuit comprises a fourth switch, a fifth switch and a sixth switch; the fourth switch, the fifth switch and the sixth switch are single-pole single-throw switches.

[0016] One end of the fourth switch is connected to the first output rectification circuit and one end of the fifth switch respectively, the other end of the fourth switch is connected to the second filter circuit and the first end of the sixth switch respectively, the other end of the fifth switch is connected to the second output rectification circuit, and the other end of the sixth switch is connected to the first filter circuit.

[0017] Optionally, the first output rectification circuit comprises a first rectifier diode, a second rectifier diode, a third rectifier diode and a fourth rectifier diode.

[0018] The second end of the first rectifier diode is connected to the first end of the first sub-secondary winding and the first end of the second rectifier diode, respectively; the first end of the first rectifier diode is connected to the first end of the third rectifier diode and the first filter circuit, respectively; the second end of the third rectifier diode is connected to the first end of the fourth rectifier diode and the second end of the first sub-secondary winding, respectively; and the second end of the fourth rectifier diode is connected to the second end of the second rectifier diode and the second fixed end of the second switch, respectively.

[0019] The second output rectifier circuit comprises a fifth rectifier diode, a sixth rectifier diode, a seventh rectifier diode and an eighth rectifier diode.

[0020] The second end of the fifth rectifier diode is connected to the first end of the second sub-secondary winding and the first end of the second rectifier diode, respectively; the first end of the fifth rectifier diode is connected to the first end of the seventh rectifier diode and the second filter circuit, respectively; the second end of the seventh rectifier diode is connected to the first end of the eighth rectifier diode and the second end of the second sub-secondary winding, respectively; and the second end of the eighth rectifier diode is connected to the second end of the sixth rectifier diode and the second fixed end of the third switch, respectively.

[0021] Optionally, the first filter circuit comprises a second inductor, and the second filter circuit comprises a third inductor.

[0022] Optionally, the first end of the second inductor is connected to the first end of the third rectifier diode, and the second end of the first inductor is connected to the first end of the output bus capacitor; the first end of the third inductor is connected to the first end of the seventh rectifier diode, and the second end of the third inductor is connected to the third fixed end of the third switch.

[0023] Optionally, the second inductor and the third inductor are coupled.

[0024] The first end of the second inductor is connected to the second end of the fourth rectifier diode, and the second end of the second inductor is connected to the second fixed end of the second switch; the first end of the third inductor is connected to the first end of the seventh rectifier diode, and the second end of the third inductor is connected to the third fixed end of the third switch.

[0025] In a second aspect, the utility model embodiment provides a control method of a conversion circuit, which is applied to a controller of a power module, wherein the power module comprises the controller and a conversion circuit; and the method comprises the following steps:

[0026] Obtaining a voltage setting value;

[0027] According to the voltage setting value and a preset voltage threshold value, a target working mode required to be switched by the conversion circuit is determined;

[0028] controlling the conversion circuit to switch to the target operation mode.

[0029] Optionally, the determining the target operation mode required by the conversion circuit to switch according to the voltage setting value and the preset voltage threshold value comprises:

[0030] when the voltage setting value is less than or equal to a first preset voltage threshold value, determining that the target operation mode required by the conversion circuit to switch is a first operation mode, the first operation mode being an operation mode in which a first output rectifier circuit and a second output rectifier circuit are connected in parallel and a first switch is switched to a first dynamic terminal state;

[0031] when the voltage setting value is greater than the first preset voltage threshold value and less than or equal to a second preset voltage threshold value, determining that the target operation mode required by the conversion circuit to switch is a second operation mode, the second operation mode being an operation mode in which the first output rectifier circuit and the second output rectifier circuit are connected in parallel and the first switch is switched to a second dynamic terminal state;

[0032] when the voltage setting value is greater than the second preset voltage threshold value and less than or equal to a third preset voltage threshold value, determining that the target operation mode required by the conversion circuit to switch is a third operation mode, the third operation mode being an operation mode in which the first output rectifier circuit and the second output rectifier circuit are connected in series and the first switch is switched to the first dynamic terminal state;

[0033] when the voltage setting value is greater than the third preset voltage threshold value, determining that the target operation mode required by the conversion circuit to switch is a fourth operation mode, the third operation mode being an operation mode in which the first output rectifier circuit and the second output rectifier circuit are connected in series and the first switch is switched to the second dynamic terminal state.

[0034] In a third aspect, an embodiment of the utility model provides a control chip, the control chip comprises the control method of the conversion circuit of the second aspect.

[0035] In a fourth aspect, an embodiment of the utility model provides a charging pile, the charging pile comprises the conversion circuit of the first aspect or the control method of the conversion circuit of the second aspect.

[0036] In a fifth aspect, an embodiment of the utility model provides an electronic device, comprising: a processor and a memory, the processor is connected with the memory, the memory is used for storing a computer program, and the processor is used for executing the computer program stored in the memory, and the electronic device executes the control method of the conversion circuit.

[0037] In a sixth aspect, the utility model discloses a computer readable storage medium, and the computer readable storage medium stores a computer program, and the computer program is executed by the processor and includes the control method of the above-mentioned conversion circuit.

[0038] The utility model discloses an embodiment, and the following beneficial effects are obtained.

[0039] It can be seen that the utility model discloses an embodiment of a conversion circuit, and the filter circuit is arranged at the front end of the interlocking switching circuit, so that the output current of the first output rectifier circuit and the second output rectifier circuit is consistent when the two circuits are connected in parallel, the overcurrent risk caused by uneven current of the two circuits is avoided, the second switch and the third switch are coupled, the problem of output DC bus short circuit caused by asynchronous switching of the relay switch is avoided, and the stability and reliability of the power module are improved. BRIEF DESCRIPTION OF DRAWINGS

[0040] In order to more clearly illustrate the technical scheme in the embodiment of the utility model, the following will briefly introduce the drawings needed to be used in the embodiment description, and obviously, the drawings in the following description are some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained according to these drawings without creative labor.

[0041] Figure 1 It is the architecture diagram of a conversion circuit provided by the embodiment of the application;

[0042] Figure 2 It is the circuit diagram of a conversion circuit provided by the embodiment of the application;

[0043] Figure 3 It is the equivalent diagram of a conversion circuit provided by the embodiment of the application;

[0044] Figure 4 It is the equivalent diagram of another conversion circuit provided by the embodiment of the application;

[0045] Figure 5 It is the equivalent diagram of another conversion circuit provided by the embodiment of the application;

[0046] Figure 6 It is the circuit diagram of another conversion circuit provided by the embodiment of the application;

[0047] Figure 7 It is the flow chart of a control method of a conversion circuit provided by the embodiment of the application;

[0048] Figure 8 It is the structural schematic diagram of an electronic equipment provided by the embodiment of the application;

[0049] Figure 9is a control chip function unit composition block diagram provided by an embodiment of the present application. DETAILED DESCRIPTION

[0050] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work under the premise that the embodiments in the present application belong to the scope of protection of the present application.

[0051] The terms "first", "second", "third", and "fourth" and the like in the description, claims, and drawings of the present application are used to distinguish different objects, rather than to describe a particular order. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device including a series of steps or units is not limited to the listed steps or units, but can optionally include steps or units not listed or can optionally include other steps or units inherent to the process, method, product, or device.

[0052] In this document, the term "embodiment" means that the specific features, results, or characteristics described in connection with the embodiment can be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it independent or alternative to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0053] In order to facilitate understanding of the technical solutions of the present application, first, the related technologies involved in the present application are introduced.

[0054] Referring to Figure 1 , Figure 1 is an architecture diagram of a conversion circuit provided by an embodiment of the present application, as shown in Figure 1As shown, the conversion circuit includes a voltage source Vi, an input bus capacitor Ci, a primary conversion circuit 10, a transformer 20, a rectification filter combined switching circuit 30, an interlocking switching circuit 40 and an output bus capacitor Co. The input bus capacitor Ci is connected to the voltage source Vi and the primary conversion circuit 10 respectively; the primary conversion circuit 10 is connected to the transformer 20; the transformer 20 is connected to the rectification filter combined switching circuit 30; the transformer 20 includes a primary winding 21 and a secondary winding 22, the primary conversion circuit 10 is connected to the primary winding 21, and the secondary winding 22 is connected to the rectification filter combined switching circuit 30; the rectification filter combined switching circuit 30 is connected to the interlocking switching circuit 40; the rectification filter combined switching circuit 30 includes a first output rectification circuit 31, a second output rectification circuit 32, a first filter circuit 33 and a second filter circuit 34; the first output rectification circuit 31 is connected to the secondary winding 22 and the first filter circuit 33 respectively, and the second output rectification circuit 32 is connected to the secondary winding 22 and the second filter circuit 34 respectively; the interlocking switching circuit 40 is connected to the output bus capacitor Co.

[0055] Please refer to Figure 2 , Figure 2 is a circuit diagram of a conversion circuit provided by the embodiment of the present application, the transformer 20 includes a first switch K1, the primary winding includes a first sub-primary winding S1 and a second sub-primary winding S2, the secondary winding includes a first sub-secondary winding S3 and a second sub-secondary winding S4, the first dynamic terminal of the first switch K1 is connected to the first end of the first sub-primary winding S1, the second dynamic terminal of the first switch K1 is connected to the second end of the first sub-primary winding S1 and the first end of the second sub-primary winding S2 respectively, and the first stationary terminal of the first switch K1 is connected to the primary conversion circuit 10. Vo is an output voltage.

[0056] Optionally, the interlocking switching circuit 40 includes a second switch K2 and a third switch K3, the second stationary terminal of the second switch K2 is connected to the first output rectification circuit 31, the third dynamic terminal of the second switch K2 is connected to the fifth dynamic terminal of the third switch K3, the fourth dynamic terminal of the second switch K2 is connected to the second end of the output bus capacitor Co, the third stationary terminal of the third switch K3 is connected to the second filter circuit 34, and the sixth dynamic terminal of the third switch K3 is connected to the first end of the output bus capacitor Co.

[0057] Optionally, the first output rectifier circuit 31 comprises a first rectifier diode D1, a second rectifier diode D2, a third rectifier diode D3 and a fourth rectifier diode D4; the second end of the first rectifier diode D1 is connected to the first end of the first sub-secondary winding S3 and the first end of the second rectifier diode D2 respectively, the first end of the first rectifier diode D1 is connected to the first end of the third rectifier diode D3 and the first filter circuit 33 respectively, the second end of the third rectifier diode D3 is connected to the first end of the fourth rectifier diode D4 and the second end of the first sub-secondary winding S3 respectively, the second end of the fourth rectifier diode D4 is connected to the second end of the second rectifier diode D2 and the second fixed end of the second switch K2 respectively; the second output rectifier circuit 32 comprises a fifth rectifier diode D5, a sixth rectifier diode D6, a seventh rectifier diode D7 and an eighth rectifier diode D8; the second end of the fifth rectifier diode D5 is connected to the first end of the second sub-secondary winding S4 and the first end of the sixth rectifier diode D6 respectively, the first end of the fifth rectifier diode D5 is connected to the first end of the seventh rectifier diode D7 and the second filter circuit 34 respectively, the second end of the seventh rectifier diode D7 is connected to the first end of the eighth rectifier diode D8 and the second end of the second sub-secondary winding S4 respectively, the second end of the eighth rectifier diode D8 is connected to the second end of the sixth rectifier diode D6 and the second fixed end of the third switch K3 respectively.

[0058] Wherein, when the second switch K2 is switched to the third movable end and the third switch K3 is switched to the fifth movable end, the first output rectifier circuit 31 and the second output rectifier circuit are connected in parallel, when the second switch K2 is switched to the fourth movable end and the third switch K3 is switched to the sixth movable end, the first output rectifier circuit 31 and the second output rectifier circuit 32 are connected in series.

[0059] Wherein, the switches mentioned in the scheme embodiment include but are not limited to relays, and the switches can be replaced by equivalent power switch tubes of bidirectional semiconductors.

[0060] Optionally, the first filter circuit 33 comprises a second inductor L2, and the second filter circuit 34 comprises a third inductor L3.

[0061] Optionally, the first end of the second inductor L2 is connected to the first end of the third rectifier diode D3, and the second end of the second inductor L2 is connected to the first end of the output bus capacitor Co; the first end of the third inductor L3 is connected to the first end of the seventh rectifier diode D7, and the second end of the third inductor L3 is connected to the third fixed end of the third switch K3.

[0062] It can be seen that the utility model discloses a kind of conversion circuit, filter circuit is arranged in the front end of interlock switching circuit, can realize that the output current is consistent when first output rectifier circuit and second output rectifier circuit are in parallel output, avoid the overcurrent risk caused by two-way uneven flow, simultaneously, second switch K2 and third switch K3 are coupled design, avoid the problem of output DC bus short circuit caused by relay switch switching out of synchronization, beneficial to improve the stability and reliability of power module work.

[0063] Please refer to Figure 3 , Figure 3 It is an equivalent diagram of a kind of conversion circuit provided in the embodiment of the application, the second inductance L2 and the third inductance L3 are coupled;The first end of the second inductance L2 is connected with the second end of the fourth rectifier diode D4, and the second end of the second inductance L2 is connected with the second fixed terminal of the second switch K2;The first end of the third inductance L3 is connected with the first end of the seventh rectifier diode D7, and the second end of the third inductance L3 is connected with the third fixed terminal of the third switch K3.

[0064] It can be seen that by coupling the second inductance L2 and the third inductance L3, the output winding leakage inductance difference and line impedance difference can be offset to improve the current sharing capability of the two output windings.

[0065] Please refer to Figure 4 , Figure 4 It is an equivalent diagram of another conversion circuit provided in the embodiment of the application, the interlock switching circuit 40 includes a fourth switch K4, a fifth switch K5 and a sixth switch K6;The fourth switch K4, the fifth switch K5 and the sixth switch K6 are single-pole single-throw switches;One end of the fourth switch K4 is connected with the first output rectifier circuit 31 and one end of the fifth switch K5 respectively, the other end of the fourth switch K4 is connected with the second filter circuit 34 and the first end of the sixth switch K6 respectively, the other end of the fifth switch K5 is connected with the second output rectifier circuit 32, and the other end of the sixth switch is connected with the first filter circuit 33.

[0066] When the fourth switch K4 is closed and the fifth switch K5 is disconnected and the sixth switch is disconnected, the first output rectifier circuit 31 and the second output rectifier circuit 32 are connected in parallel, and when the fourth switch K4 is disconnected, the fifth switch K5 is closed and the sixth switch is closed, the first output rectifier circuit 31 and the second output rectifier circuit 32 are connected in series.

[0067] Please refer to Figure 5 , Figure 5Is another equivalent diagram of the transformation circuit provided by the embodiment of the application, the transformer includes a first switch K1, the primary winding includes a first sub-primary winding S1, a second sub-primary winding S2, a third sub-primary winding S5 and a fourth sub-primary winding S6, the secondary winding includes a first sub-secondary winding S3 and a second sub-secondary winding S4, the first switch looks the fixed end connection primary side conversion circuit 10, the first movable end of the first switch K1 is connected with the first end of the first sub-primary winding S1, the second movable end of the first switch K1 is connected with the second end of the first sub-primary winding S1, the first end of the second sub-primary winding S2, the second end of the third sub-primary winding S5 and the fourth end of the fourth sub-primary winding S6 respectively, the second sub-primary winding S2 is connected with the second end of the fourth sub-primary winding S6 and the primary side conversion circuit 10 respectively, the first sub-primary winding S1 and the second sub-primary winding S2 are coupled with the first sub-secondary winding S3, and the third sub-primary winding S5 and the fourth sub-primary winding S6 are coupled with the second sub-secondary winding S4.

[0068] It can be seen that the embodiment of the utility model shows a kind of transformation circuit, filter circuit is arranged in the front end of interlock switching circuit, can realize that the output current is consistent when first output rectifier circuit and second output rectifier circuit are in parallel output, avoid the overcurrent risk caused by two-way uneven flow, simultaneously, second switch K2 and third switch K3 are coupled design, avoid the problem that output DC bus short circuit is caused by relay switch switching out of step, it is favorable to improve the stability and reliability of power module work.

[0069] Please refer to Figure 6 , Figure 6 Is another circuit diagram of the transformation circuit provided by the embodiment of the application, the primary side conversion circuit 10 includes a first switch tube Q1, a second switch tube Q2, a third switch tube Q3, a fourth switch tube Q4, a first inductor L1 and a first capacitor Cd;The first end of the first switch tube Q1 is connected with the first end of the input bus capacitor Vi and the first end of the third switch tube Q3 respectively, the second end of the first switch tube Q1 is connected with the first end of the second switch tube Q2 and the first end of the first inductor L1 respectively, the second end of the second switch tube Q2 is connected with the second end of the input bus capacitor Vi and the second end of the fourth switch tube Q4 respectively, the second end of the third switch tube Q3 is connected with the first end of the fourth switch tube Q4 and the second end of the second sub-primary winding S2 respectively, the first inductor L1 is connected with the first end of the first capacitor Cd, the second end of the first capacitor Cd is connected with the first fixed end of the first switch K1, the first movable end of the first switch K1 is connected with the first end of the first sub-primary winding S1, and the second movable end of the first switch K1 is connected with the second end of the first sub-primary winding S1 and the first end of the second sub-primary winding S2 respectively.

[0070] Further, please refer toFigure 7 , Figure 7 is a flowchart of a control method of a conversion circuit provided by an embodiment of the present application. The control method of the conversion circuit is described as follows: the control method of the conversion circuit is applied to a controller of a power module, and the power module comprises the controller and the conversion circuit.

[0071] After the power module is powered on, the controller performs the following steps:

[0072] Step 701: obtaining a voltage setting value.

[0073] The voltage setting value is artificially set or system default, which is not limited herein.

[0074] Step 702: determining a target working mode required to be switched by the conversion circuit according to the voltage setting value and a preset voltage threshold.

[0075] The determination of the target working mode required to be switched by the conversion circuit according to the voltage setting value and the preset voltage threshold comprises the following steps: when the voltage setting value is less than or equal to a first preset voltage threshold, it is determined that the target working mode required to be switched by the conversion circuit is a first working mode, and the first working mode is a working mode in which a first output rectifier circuit and a second output rectifier circuit are connected in parallel and a first switch is switched to a first dynamic terminal state; when the voltage setting value is greater than the first preset voltage threshold and less than or equal to a second preset voltage threshold, it is determined that the target working mode required to be switched by the conversion circuit is a second working mode, and the second working mode is a working mode in which the first output rectifier circuit and the second output rectifier circuit are connected in parallel and the first switch is switched to a second dynamic terminal state; when the voltage setting value is greater than the second preset voltage threshold and less than or equal to a third preset voltage threshold, it is determined that the target working mode required to be switched by the conversion circuit is a third working mode, and the third working mode is a working mode in which the first output rectifier circuit and the second output rectifier circuit are connected in series and the first switch is switched to the first dynamic terminal state; when the voltage setting value is greater than the third preset voltage threshold, it is determined that the target working mode required to be switched by the conversion circuit is a fourth working mode, and the third working mode is a working mode in which the first output rectifier circuit and the second output rectifier circuit are connected in series and the first switch is switched to the second dynamic terminal state.

[0076] The first preset voltage threshold, the second preset voltage threshold and the third preset voltage threshold can be artificially set or system default, which is not limited herein.

[0077] When the conversion circuit is in the first working mode, an output voltage gain Vo1 is calculated according to the following formula:

[0078]

[0079] Wherein, D is the equivalent duty ratio of the phase-shift full-bridge circuit control, n is the winding turns ratio of the secondary winding of the transformer, e is the winding turns ratio of the first sub-primary winding of the transformer, and f is the winding turns ratio of the second sub-primary winding of the transformer.

[0080] Wherein, when the conversion circuit is in the first working mode, the output current capability Io1 is calculated as follows:

[0081]

[0082] Wherein, when the conversion circuit is in the second working mode, the output voltage gain Vo2 is calculated as follows:

[0083]

[0084] Wherein, when the conversion circuit is in the third working mode, the output current capability Io3 is calculated as follows:

[0085]

[0086] Wherein, when the conversion circuit is in the third working mode, the output voltage gain Vo3 is calculated as follows:

[0087]

[0088] Wherein, when the conversion circuit is in the third working mode, the output current capability Io3 is calculated as follows:

[0089]

[0090] Wherein, when the conversion circuit is in the fourth working mode, the output voltage gain Vo4 is calculated as follows:

[0091]

[0092] Wherein, when the conversion circuit is in the fourth working mode, the output current capability Io4 is calculated as follows:

[0093]

[0094] Step 703, control the conversion circuit to switch to the target working mode.

[0095] Wherein, when switching from the low-voltage working mode to the high-voltage working mode, the corresponding preset voltage threshold is reached to switch, and when switching from the high-voltage working mode to the low-voltage working mode, the corresponding (pre-set voltage threshold-Vd) is reached to switch, Vd is a pre-set hysteresis interval voltage, and such design can avoid frequent switching of the working mode.

[0096] Wherein, before the switching of the switch, the main power switch tube drive of the power module is turned off first, and a delay preset time is set. The preset time can be set artificially or by default by the system, and is not limited here.

[0097] For example, the controller controls the second switch K2 in the conversion circuit to switch to the third active terminal, and the third switch to switch to the fifth active terminal, at which time the first rectifier circuit and the second rectifier circuit are connected in series; the controller controls the second switch K2 in the conversion circuit to switch to the fourth active terminal, and the third switch to switch to the sixth active terminal, at which time the first rectifier circuit and the second rectifier circuit are connected in parallel. Figure 2 Wherein, the conversion circuit comprises: a voltage source; an input bus capacitor, which is connected to the voltage source and the primary side conversion circuit respectively; the primary side conversion circuit, which is connected to a transformer; the transformer, which is connected to a rectifier filter combination switching circuit; the transformer comprises a primary winding and a secondary winding, the primary side conversion circuit is connected to the primary winding, and the secondary winding is connected to the rectifier filter combination switching circuit; the rectifier filter combination switching circuit, which is connected to an interlock switching circuit; the rectifier filter combination switching circuit comprises a first output rectifier circuit, a second output rectifier circuit, a first filter circuit and a second filter circuit; the first output rectifier circuit is connected to the secondary winding and the first filter circuit respectively, and the second output rectifier circuit is connected to the secondary winding and the second filter circuit respectively; the interlock switching circuit, which is connected to an output bus capacitor; the output bus capacitor.

[0098] As can be seen, in the present example, the controller first acquires the voltage setting value, then determines the target working mode required for the conversion circuit to switch according to the voltage setting value and the preset voltage threshold, and finally controls the conversion circuit to switch to the target working mode, which can improve the intelligence of the conversion circuit in switching the working mode.

[0099]

[0100] ​Optionally, the primary side conversion circuit comprises a first switch tube, a second switch tube, a third switch tube, a fourth switch tube, a first inductor and a first capacitor; the transformer comprises a first switch, the primary side winding comprises a first sub-primary side winding and a second sub-primary side winding, and the secondary side winding comprises a first sub-secondary side winding and a second sub-secondary side winding; a first end of the first switch tube is connected to a first end of the input bus capacitor and a first end of the third switch tube respectively, a second end of the first switch tube is connected to a first end of the second switch tube and a first end of the first inductor respectively, a second end of the second switch tube is connected to a second end of the input bus capacitor and a second end of the fourth switch tube respectively, a second end of the third switch tube is connected to a first end of the fourth switch tube and a second end of the second sub-primary side winding respectively, the first inductor is connected to a first end of the first capacitor, a second end of the first capacitor is connected to a first fixed end of the first switch, a first movable end of the first switch is connected to a first end of the first sub-primary side winding, and a second movable end of the first switch is connected to a second end of the first sub-primary side winding and a first end of the second sub-primary side winding respectively.

[0101] Optionally, the interlocking switching circuit comprises a second switch and a third switch, a second fixed end of the second switch is connected to the first output rectification circuit, a third movable end of the second switch is connected to a fifth movable end of the third switch, a fourth movable end of the second switch is connected to a second end of the output bus capacitor, a third fixed end of the third switch is connected to the second filter circuit, and a sixth movable end of the third switch is connected to a first end of the output bus capacitor.

[0102] Optionally, the interlocking switching circuit comprises a fourth switch, a fifth switch and a sixth switch; the fourth switch, the fifth switch and the sixth switch are single-pole single-throw switches; one end of the fourth switch is connected to the first output rectification circuit and one end of the fifth switch respectively, the other end of the fourth switch is connected to the second filter circuit and a first end of the sixth switch respectively, the other end of the fifth switch is connected to the second output rectification circuit, and the other end of the sixth switch is connected to the first filter circuit.

[0103] Optionally, the first output rectifier circuit comprises a first rectifier diode, a second rectifier diode, a third rectifier diode and a fourth rectifier diode; the second end of the first rectifier diode is connected to the first end of the first sub-secondary winding and the first end of the second rectifier diode respectively, the first end of the first rectifier diode is connected to the first end of the third rectifier diode and the first filter circuit respectively, the second end of the third rectifier diode is connected to the first end of the fourth rectifier diode and the second end of the first sub-secondary winding respectively, and the second end of the fourth rectifier diode is connected to the second end of the second rectifier diode and the second fixed end of the second switch respectively; the second output rectifier circuit comprises a fifth rectifier diode, a sixth rectifier diode, a seventh rectifier diode and an eighth rectifier diode; the second end of the fifth rectifier diode is connected to the first end of the second sub-secondary winding and the first end of the second rectifier diode respectively, the first end of the fifth rectifier diode is connected to the first end of the seventh rectifier diode and the second filter circuit respectively, the second end of the seventh rectifier diode is connected to the first end of the eighth rectifier diode and the second end of the second sub-secondary winding respectively, and the second end of the eighth rectifier diode is connected to the second end of the sixth rectifier diode and the second fixed end of the third switch respectively.

[0104] Optionally, the first filter circuit comprises a second inductor, and the second filter circuit comprises a third inductor.

[0105] Optionally, the first end of the second inductor is connected to the first end of the third rectifier diode, and the second end of the first inductor is connected to the first end of the output bus capacitor; the first end of the third inductor is connected to the first end of the seventh rectifier diode, and the second end of the third inductor is connected to the third fixed end of the third switch.

[0106] Optionally, the second inductor and the third inductor are coupled; the first end of the second inductor is connected to the second end of the fourth rectifier diode, and the second end of the second inductor is connected to the second fixed end of the second switch; the first end of the third inductor is connected to the first end of the seventh rectifier diode, and the second end of the third inductor is connected to the third fixed end of the third switch.

[0107] Please refer to Figure 8 , Figure 8 is a structural schematic diagram of an electronic device provided by the embodiment of the present application, which is applied to a controller of a power supply module, and the power supply module comprises the controller and a conversion circuit; as shown in Figure 8 the electronic device comprises a processor, a memory, a communication interface and one or more programs, wherein the one or more programs are stored in the memory, and the one or more programs are configured to instruct the processor to perform the following steps:

[0108] obtaining a voltage setting value;

[0109] determining a target operation mode required to be switched by the conversion circuit according to the voltage setting value and a preset voltage threshold value;

[0110] controlling the conversion circuit to switch to the target operation mode.

[0111] The conversion circuit comprises a voltage source, an input bus capacitor connected to the voltage source and a primary side conversion circuit, the primary side conversion circuit connected to a transformer, the transformer connected to a rectification filter combined switching circuit, the transformer comprising a primary side winding connected to the primary side conversion circuit and a secondary side winding connected to the rectification filter combined switching circuit, the rectification filter combined switching circuit connected to an interlocking switching circuit, the rectification filter combined switching circuit comprising a first output rectification circuit, a second output rectification circuit, a first filter circuit and a second filter circuit, the first output rectification circuit connected to the secondary side winding and the first filter circuit respectively, the second output rectification circuit connected to the secondary side winding and the second filter circuit respectively, and the interlocking switching circuit connected to an output bus capacitor.

[0112] It can be seen that in the example, the electronic device first obtains a voltage setting value, then determines a target operation mode required to be switched by the conversion circuit according to the voltage setting value and a preset voltage threshold value, and finally controls the conversion circuit to switch to the target operation mode, thereby improving the intelligence of the conversion circuit in switching operation modes.

[0113] In one possible example, the step of determining a target operation mode required to be switched by the conversion circuit according to the voltage setting value and a preset voltage threshold value comprises the following steps:

[0114] when the voltage setting value is less than or equal to a first preset voltage threshold value, determining that the target operation mode required to be switched by the conversion circuit is a first operation mode, the first operation mode being an operation mode in which the first output rectification circuit and the second output rectification circuit are connected in parallel and the first switch is switched to a first dynamic terminal state;

[0115] when the voltage setting value is greater than the first preset voltage threshold value and less than or equal to a second preset voltage threshold value, determining that the target operation mode required to be switched by the conversion circuit is a second operation mode, the second operation mode being an operation mode in which the first output rectification circuit and the second output rectification circuit are connected in parallel and the first switch is switched to a second dynamic terminal state;

[0116] when the voltage setting value is greater than the second preset voltage threshold and less than or equal to a third preset voltage threshold, the target operation mode required to be switched by the conversion circuit is determined as a third operation mode, the third operation mode being an operation mode in which the first output rectifier circuit and the second output rectifier circuit are connected in series and the first switch is switched to the first movable terminal state;

[0117] when the voltage setting value is greater than the third preset voltage threshold, the target operation mode required to be switched by the conversion circuit is determined as a fourth operation mode, the third operation mode being an operation mode in which the first output rectifier circuit and the second output rectifier circuit are connected in series and the first switch is switched to the second movable terminal state.

[0118] Optionally, the primary conversion circuit comprises a first switch tube, a second switch tube, a third switch tube, a fourth switch tube, a first inductor and a first capacitor; the transformer comprises a first switch, the primary winding comprises a first sub-primary winding and a second sub-primary winding, and the secondary winding comprises a first sub-secondary winding and a second sub-secondary winding; a first end of the first switch tube is connected to a first end of the input bus capacitor and a first end of the third switch tube, respectively; a second end of the first switch tube is connected to a first end of the second switch tube and a first end of the first inductor, respectively; a second end of the second switch tube is connected to a second end of the input bus capacitor and a second end of the fourth switch tube, respectively; a second end of the third switch tube is connected to a first end of the fourth switch tube and a second end of the second sub-primary winding, respectively; the first inductor is connected to a first end of the first capacitor; a second end of the first capacitor is connected to a first fixed terminal of the first switch; a first movable terminal of the first switch is connected to a first end of the first sub-primary winding; and a second movable terminal of the first switch is connected to a second end of the first sub-primary winding and a first end of the second sub-primary winding, respectively.

[0119] Optionally, the interlocking switching circuit comprises a second switch and a third switch; a second fixed terminal of the second switch is connected to the first output rectifier circuit; a third movable terminal of the second switch is connected to a fifth movable terminal of the third switch; a fourth movable terminal of the second switch is connected to a second end of the output bus capacitor; a third fixed terminal of the third switch is connected to the second filter circuit; and a sixth movable terminal of the third switch is connected to a first end of the output bus capacitor.

[0120] Optionally, the interlocking switching circuit comprises a fourth switch, a fifth switch and a sixth switch; the fourth switch, the fifth switch and the sixth switch are single-pole single-throw switches; one end of the fourth switch is connected to the first output rectifier circuit and one end of the fifth switch respectively, the other end of the fourth switch is connected to the second filter circuit and the first end of the sixth switch respectively, the other end of the fifth switch is connected to the second output rectifier circuit, and the other end of the sixth switch is connected to the first filter circuit.

[0121] Optionally, the first output rectifier circuit comprises a first rectifier diode, a second rectifier diode, a third rectifier diode and a fourth rectifier diode; the second end of the first rectifier diode is connected to the first end of the first sub-secondary side winding and the first end of the second rectifier diode respectively, the first end of the first rectifier diode is connected to the first end of the third rectifier diode and the first filter circuit respectively, the second end of the third rectifier diode is connected to the first end of the fourth rectifier diode and the second end of the first sub-secondary side winding respectively, and the second end of the fourth rectifier diode is connected to the second end of the second rectifier diode and the second stationary end of the second switch respectively; the second output rectifier circuit comprises a fifth rectifier diode, a sixth rectifier diode, a seventh rectifier diode and an eighth rectifier diode; the second end of the fifth rectifier diode is connected to the first end of the second sub-secondary side winding and the first end of the second rectifier diode respectively, the first end of the fifth rectifier diode is connected to the first end of the seventh rectifier diode and the second filter circuit respectively, the second end of the seventh rectifier diode is connected to the first end of the eighth rectifier diode and the second end of the second sub-secondary side winding respectively, and the second end of the eighth rectifier diode is connected to the second end of the sixth rectifier diode and the second stationary end of the third switch respectively.

[0122] Optionally, the first filter circuit comprises a second inductor, and the second filter circuit comprises a third inductor.

[0123] Optionally, the first end of the second inductor is connected to the first end of the third rectifier diode, and the second end of the first inductor is connected to the first end of the output bus capacitor; the first end of the third inductor is connected to the first end of the seventh rectifier diode, and the second end of the third inductor is connected to the third stationary end of the third switch.

[0124] Optionally, the second inductor and the third inductor are coupled; the first end of the second inductor is connected to the second end of the fourth rectifier diode, and the second end of the second inductor is connected to the second stationary end of the second switch; the first end of the third inductor is connected to the first end of the seventh rectifier diode, and the second end of the third inductor is connected to the third stationary end of the third switch.

[0125] In the case of dividing each functional module according to each function, Figure 9 is a functional unit composition block diagram of a control chip provided by an embodiment of the present application, as shown in Figure 9 applied to a controller of a power module, the power module comprising the controller and a conversion circuit; the control chip comprises an acquisition unit 901, a determination unit 902 and a control unit 903, wherein

[0126] The acquisition unit 901 is configured to acquire a voltage setting value.

[0127] The determination unit 902 is configured to determine a target working mode required to be switched by the conversion circuit according to the voltage setting value and a preset voltage threshold value.

[0128] The control unit 903 is configured to control the conversion circuit to switch to the target working mode.

[0129] It can be seen that in the present example, the control chip first acquires a voltage setting value, then determines a target working mode required to be switched by the conversion circuit according to the voltage setting value and a preset voltage threshold value, and finally controls the conversion circuit to switch to the target working mode, thereby improving the intelligence of the conversion circuit in switching working modes.

[0130] In one possible example, the step of determining the target working mode required to be switched by the conversion circuit according to the voltage setting value and the preset voltage threshold value comprises the following steps:

[0131] When the voltage setting value is less than or equal to a first preset voltage threshold value, the target working mode required to be switched by the conversion circuit is determined as a first working mode, and the first working mode is a working mode in which a first output rectifier circuit and a second output rectifier circuit are connected in parallel and a first switch is switched to a first dynamic terminal state.

[0132] When the voltage setting value is greater than the first preset voltage threshold value and less than or equal to a second preset voltage threshold value, the target working mode required to be switched by the conversion circuit is determined as a second working mode, and the second working mode is a working mode in which the first output rectifier circuit and the second output rectifier circuit are connected in parallel and the first switch is switched to a second dynamic terminal state.

[0133] When the voltage setting value is greater than the second preset voltage threshold value and less than or equal to a third preset voltage threshold value, the target working mode required to be switched by the conversion circuit is determined as a third working mode, and the third working mode is a working mode in which the first output rectifier circuit and the second output rectifier circuit are connected in series and the first switch is switched to the first dynamic terminal state.

[0134] When the voltage setting value is greater than the third preset voltage threshold, it is determined that the target operation mode required for switching of the conversion circuit is a fourth operation mode, and the third operation mode is an operation mode in which the first output rectifier circuit and the second output rectifier circuit are connected in series and the first switch is switched to the second dynamic terminal state.

[0135] Optionally, the primary side conversion circuit comprises a first switch tube, a second switch tube, a third switch tube, a fourth switch tube, a first inductor and a first capacitor; the transformer comprises a first switch, the primary side winding comprises a first sub-primary side winding and a second sub-primary side winding, and the secondary side winding comprises a first sub-secondary side winding and a second sub-secondary side winding; a first end of the first switch tube is connected to a first end of the input bus capacitor and a first end of the third switch tube, respectively; a second end of the first switch tube is connected to a first end of the second switch tube and a first end of the first inductor, respectively; a second end of the second switch tube is connected to a second end of the input bus capacitor and a second end of the fourth switch tube, respectively; a second end of the third switch tube is connected to a first end of the fourth switch tube and a second end of the second sub-primary side winding, respectively; the first inductor is connected to a first end of the first capacitor; a second end of the first capacitor is connected to a first fixed terminal of the first switch; a first dynamic terminal of the first switch is connected to a first end of the first sub-primary side winding; and a second dynamic terminal of the first switch is connected to a second end of the first sub-primary side winding and a first end of the second sub-primary side winding, respectively.

[0136] Optionally, the interlocking switching circuit comprises a second switch and a third switch; a second fixed terminal of the second switch is connected to the first output rectifier circuit; a third dynamic terminal of the second switch is connected to a fifth dynamic terminal of the third switch; a fourth dynamic terminal of the second switch is connected to a second end of the output bus capacitor; a third fixed terminal of the third switch is connected to the second filter circuit; and a sixth dynamic terminal of the third switch is connected to a first end of the output bus capacitor.

[0137] Optionally, the interlocking switching circuit comprises a fourth switch, a fifth switch and a sixth switch; the fourth switch, the fifth switch and the sixth switch are single-pole single-throw switches; one end of the fourth switch is connected to the first output rectifier circuit and one end of the fifth switch, respectively; the other end of the fourth switch is connected to the second filter circuit and a first end of the sixth switch, respectively; the other end of the fifth switch is connected to the second output rectifier circuit; and the other end of the sixth switch is connected to the first filter circuit.

[0138] Optionally, the first output rectifier circuit comprises a first rectifier diode, a second rectifier diode, a third rectifier diode and a fourth rectifier diode; the second end of the first rectifier diode is connected to the first end of the first sub-secondary winding and the first end of the second rectifier diode respectively, the first end of the first rectifier diode is connected to the first end of the third rectifier diode and the first filter circuit respectively, the second end of the third rectifier diode is connected to the first end of the fourth rectifier diode and the second end of the first sub-secondary winding respectively, and the second end of the fourth rectifier diode is connected to the second end of the second rectifier diode and the second fixed end of the second switch respectively; the second output rectifier circuit comprises a fifth rectifier diode, a sixth rectifier diode, a seventh rectifier diode and an eighth rectifier diode; the second end of the fifth rectifier diode is connected to the first end of the second sub-secondary winding and the first end of the second rectifier diode respectively, the first end of the fifth rectifier diode is connected to the first end of the seventh rectifier diode and the second filter circuit respectively, the second end of the seventh rectifier diode is connected to the first end of the eighth rectifier diode and the second end of the second sub-secondary winding respectively, and the second end of the eighth rectifier diode is connected to the second end of the sixth rectifier diode and the second fixed end of the third switch respectively.

[0139] Optionally, the first filter circuit comprises a second inductor, and the second filter circuit comprises a third inductor.

[0140] Optionally, the first end of the second inductor is connected to the first end of the third rectifier diode, and the second end of the first inductor is connected to the first end of the output bus capacitor; the first end of the third inductor is connected to the first end of the seventh rectifier diode, and the second end of the third inductor is connected to the third fixed end of the third switch.

[0141] Optionally, the second inductor and the third inductor are coupled; the first end of the second inductor is connected to the second end of the fourth rectifier diode, and the second end of the second inductor is connected to the second fixed end of the second switch; the first end of the third inductor is connected to the first end of the seventh rectifier diode, and the second end of the third inductor is connected to the third fixed end of the third switch.

[0142] It should be noted that all related contents of each step involved in the above method embodiments can be cited to the function description of the corresponding function module, which will not be repeated here.

[0143] The electronic device provided in the embodiment is used to execute the control method of the above transformation circuit, and thus the same effect as the above implementation method can be achieved.

[0144] In the case of employing integrated units, the electronic device can include a processing module, a storage module and a communication module. The processing module can be used to control and manage the actions of the electronic device, for example, it can be used to support the electronic device to perform the steps performed by the functional units described above. The storage module can be used to support the electronic device to execute program codes and data, etc. The communication module can be used to support the communication between the electronic device and other devices.

[0145] The processing module can be a processor or a controller. It can implement or execute the various exemplary logical blocks, modules and circuits described in combination with the disclosure of the present application. The processor can also be a combination of computing functions, such as a combination of one or more microprocessors, a combination of digital signal processing (DSP) and microprocessors, etc. The storage module can be a memory. The communication module can be a device for interacting with other electronic devices, such as a radio frequency circuit, a Bluetooth chip, a Wi-Fi chip, etc.

[0146] The embodiments of the present application also provide a computer storage medium, which stores a computer program for electronic data exchange. The computer program causes a computer to execute some or all of the steps of any of the methods described in the above method embodiments. The computer includes an electronic device.

[0147] The embodiments of the present application also provide a computer program product, which includes a non-transitory computer-readable storage medium storing a computer program. The computer program is operable to cause a computer to execute some or all of the steps of any of the methods described in the above method embodiments. The computer program product can be a software installation package, and the computer includes a control platform.

[0148] It should be noted that, for the above-mentioned method embodiments, in order to simply describe, they are all expressed as a combination of a series of actions, but those skilled in the art should know that the present application is not limited to the described action sequence, because according to the present application, some steps can be performed in other order or simultaneously. Secondly, those skilled in the art should know that the embodiments described in the specification all belong to preferred embodiments, and the actions and modules involved are not necessarily necessary for the present application.

[0149] In the above embodiments, the description of each embodiment has its own focus, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0150] In several embodiments provided in the present application, it should be understood that the disclosed apparatus can be implemented in other manners. For example, the division of the apparatus embodiments described above is merely a logical division, and there can be another division manner in actual implementation. For example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the units shown or discussed can be indirect coupling or communication connection through some interfaces, devices or units, and can be electrical, mechanical or other forms.

[0151] The units described as separate components can or can not be physically separate, and the components shown as units can or can not be physical units, i.e., can be located in one place, or can be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the embodiment.

[0152] In addition, each functional unit in each embodiment of the present application can be integrated into a processing unit, or each unit can exist physically, or two or more units can be integrated into one unit. The integrated unit can be realized in the form of hardware or in the form of a software functional unit.

[0153] When the integrated unit is realized in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer readable storage medium. Based on this understanding, the technical solutions of the present application essentially or the part that contributes to the prior art or the whole or part of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium, and includes a plurality of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage medium includes: a U disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a mobile hard disk, a magnetic disk or an optical disk, and various media that can store program codes.

[0154] Those of ordinary skill in the art can understand that all or part of the steps of the various methods in the above embodiments can be completed by a program instructing relevant hardware, and the program can be stored in a computer readable storage medium, which can include a flash disk, a read-only memory, a random access memory, a magnetic disk or an optical disk, etc.

[0155] The above has carried out the detailed introduction to the embodiment of the application, the principle and implementation mode of the application have been described by applying specific examples in this paper, the above embodiment explanation is only used for helping understanding the method of the application and its core idea; at the same time, for the general technical personnel in the art, according to the idea of the application, the specific implementation mode and application range will have the change, and the above is described, the content of the specification should not be understood as the limitation of the application.

Claims

1. A conversion circuit, characterized by, The conversion circuit comprises: a voltage source; an input bus capacitor connected to the voltage source and a primary conversion circuit respectively; the primary conversion circuit connected to a transformer; the transformer connected to a rectification filter combined switching circuit; the transformer comprises a primary winding and a secondary winding, the primary conversion circuit is connected to the primary winding, and the secondary winding is connected to the rectification filter combined switching circuit; the rectification filter combined switching circuit connected to an interlocking switching circuit; the rectification filter combined switching circuit comprises a first output rectification circuit, a second output rectification circuit, a first filter circuit and a second filter circuit; the first output rectification circuit is connected to the secondary winding and the first filter circuit respectively, and the second output rectification circuit is connected to the secondary winding and the second filter circuit respectively; the interlocking switching circuit connected to an output bus capacitor; the output bus capacitor.

2. The conversion circuit of claim 1, wherein The transformer comprises a first switch, the primary winding comprises a first sub-primary winding and a second sub-primary winding, and the secondary winding comprises a first sub-secondary winding and a second sub-secondary winding; a second end of the second sub-primary winding is connected to one end of the primary conversion circuit, a second end of a first capacitor is connected to a first fixed end of the first switch, a first moving end of the first switch is connected to the other end of the primary conversion circuit, and second moving ends of the first switch are connected to a second end of the first sub-primary winding and a first end of the second sub-primary winding respectively.

3. The conversion circuit of claim 1, wherein The transformer comprises a first switch, the primary winding comprises a first sub-primary winding, a second sub-primary winding, a third sub-primary winding and a fourth sub-primary winding, and the secondary winding comprises a first sub-secondary winding and a second sub-secondary winding; a fixed end of the first switch is connected to one end of the primary conversion circuit, a first moving end of the first switch is connected to a first end of the first sub-primary winding, second moving ends of the first switch are connected to a second end of the first sub-primary winding, a first end of the second sub-primary winding, a second end of the third sub-primary winding and a first end of the fourth sub-primary winding respectively, and the second sub-primary winding is connected to a second end of the primary conversion circuit and a second end of the fourth sub-primary winding respectively.

4. The conversion circuit of claim 2, wherein The primary conversion circuit comprises a first switch tube, a second switch tube, a third switch tube, a fourth switch tube, a first inductor and a first capacitor; a first end of the first switch tube is connected to a first end of the input bus capacitor and a first end of the third switch tube respectively, a second end of the first switch tube is connected to a first end of the second switch tube and a first end of the first inductor respectively, a second end of the second switch tube is connected to a second end of the input bus capacitor and a second end of the fourth switch tube respectively, a second end of the third switch tube is connected to a first end of the fourth switch tube and a second end of the second sub-primary winding respectively, the first inductor is connected to a first end of the first capacitor, and a second end of the first capacitor is connected to a first fixed end of the first switch.

5. The conversion circuit of claim 1, wherein The interlocking switching circuit comprises a second switch and a third switch, a second fixed terminal of the second switch is connected to the first output rectifier circuit, a third movable terminal of the second switch is connected to a fifth movable terminal of the third switch, a fourth movable terminal of the second switch is connected to a second terminal of the output bus capacitor, a third fixed terminal of the third switch is connected to the second filter circuit, and a sixth movable terminal of the third switch is connected to a first terminal of the output bus capacitor.

6. The conversion circuit of claim 1, wherein, The interlocking switching circuit comprises a fourth switch, a fifth switch and a sixth switch; the fourth switch, the fifth switch and the sixth switch are single-pole single-throw switches. One end of the fourth switch is connected to the first output rectifier circuit and one end of the fifth switch respectively, and the other end of the fourth switch is connected to the second filter circuit and a first end of the sixth switch respectively, the other end of the fifth switch is connected to the second output rectifier circuit, and the other end of the sixth switch is connected to the first filter circuit.

7. The conversion circuit of claim 5, wherein, The first output rectifier circuit comprises a first rectifier diode, a second rectifier diode, a third rectifier diode and a fourth rectifier diode. The second end of the first rectifier diode is connected to the first end of the first sub-secondary side winding and the first end of the second rectifier diode respectively, the first end of the first rectifier diode is connected to the first end of the third rectifier diode and the first filter circuit respectively, the second end of the third rectifier diode is connected to the first end of the fourth rectifier diode and the second end of the first sub-secondary side winding respectively, and the second end of the fourth rectifier diode is connected to the second end of the second rectifier diode and the second fixed terminal of the second switch respectively. The second output rectifier circuit comprises a fifth rectifier diode, a sixth rectifier diode, a seventh rectifier diode and an eighth rectifier diode. The second end of the fifth rectifier diode is connected to the first end of the second sub-secondary side winding and the first end of the sixth rectifier diode respectively, the first end of the fifth rectifier diode is connected to the first end of the seventh rectifier diode and the second filter circuit respectively, the second end of the seventh rectifier diode is connected to the first end of the eighth rectifier diode and the second end of the second sub-secondary side winding respectively, and the second end of the eighth rectifier diode is connected to the second end of the sixth rectifier diode and the second fixed terminal of the third switch respectively.

8. The conversion circuit of claim 7, wherein, The first filter circuit comprises a second inductor, and the second filter circuit comprises a third inductor.

9. The conversion circuit of claim 8, wherein, The first end of the second inductor is connected to the first end of the third rectifier diode, and the second end of the second inductor is connected to the first terminal of the output bus capacitor; the first end of the third inductor is connected to the first end of the seventh rectifier diode, and the second end of the third inductor is connected to the third fixed terminal of the third switch.

10. The conversion circuit of claim 8, wherein, The second inductor and the third inductor are coupled. The first end of the second inductor is connected to the second end of the fourth rectifier diode, and the second end of the second inductor is connected to the second fixed terminal of the second switch; the first end of the third inductor is connected to the first end of the seventh rectifier diode, and the second end of the third inductor is connected to the third fixed terminal of the third switch.

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