Conversion circuit and control method thereof

Abstract

The invention relates to a conversion circuit and a control method of the conversion circuit, the conversion circuit 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, 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 present invention relates to the field of power supplies, and in particular to a conversion circuit and a control method for the conversion circuit. Background Art

[0002] At present, modular charging power supplies mainly have two-level topology architectures, which are divided into the front-stage AC / DC circuit and the back-stage DC / DC circuit. The front-stage AC / DC circuit mainly realizes the AC / DC conversion function of power factor correction. Currently, the three-phase Vienna topology technology solution is mainly used. The back-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 the two sets of output loops are connected in parallel, which poses the risk of device overcurrent failure and poor stability of the power module. Summary of the invention

[0003] An embodiment of the present invention provides a conversion circuit and a control method for the conversion circuit. An embodiment of the present invention invents a conversion circuit. By designing a filter circuit at the front end of an interlocking switching circuit, the output current of the first output rectifier circuit and the second output rectifier circuit can be consistent when the output is connected in parallel, avoiding the overcurrent risk caused by uneven current in two paths, which is beneficial to improving the working stability of the power module.

[0004] In a first aspect, an embodiment of the present invention provides a conversion circuit, the conversion circuit comprising:

[0005] Voltage source;

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

[0007] The primary side conversion circuit is connected to a transformer;

[0008] The transformer is connected to a rectifier-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 rectifier-filter combined switching circuit;

[0009] The rectifier-filter combined switching circuit is connected to an interlocking switching circuit; the rectifier-filter combined switching circuit comprises a first output rectifier circuit, a second output rectifier circuit, a first filtering circuit and a second filtering circuit; the first output rectifier circuit is respectively connected to the secondary winding and the first filtering circuit, and the second output rectifier circuit is respectively connected to the secondary winding and the second filtering circuit;

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

[0011] The output bus capacitor.

[0012] Optionally, the primary conversion circuit includes 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 includes a first switch, the primary winding includes a first sub-primary winding and a second sub-primary winding, and the secondary winding includes a first sub-secondary winding and a second sub-secondary winding;

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

[0014] Optionally, the interlock switching circuit includes a second switch and a third switch, the second fixed end of the second switch is connected to the first output rectifier circuit, the third moving end of the second switch is connected to the fifth moving end of the third switch, the fourth moving 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 moving end of the third switch is connected to the first end of the output bus capacitor.

[0015] Optionally, the interlock switching circuit includes 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 respectively connected to the first output rectifier circuit and one end of the fifth switch, the other end of the fourth switch is respectively connected to the second filter circuit and the first end of the sixth switch, 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.

[0017] Optionally, the first output rectifying circuit includes a first rectifying diode, a second rectifying diode, a third rectifying diode and a fourth rectifying diode;

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

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

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

[0021] Optionally, the first filtering circuit includes a second inductor, and the second filtering circuit includes 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, an embodiment of the present invention provides a control method for a conversion circuit, which is applied to a controller of a power module, wherein the power module includes the controller and a conversion circuit; the method includes:

[0026] Get the voltage setting value;

[0027] Determining a target operating mode to be switched by the conversion circuit according to a voltage setting value and a preset voltage threshold;

[0028] The conversion circuit is controlled to switch to the target operation mode.

[0029] Optionally, determining the target operating mode to be switched by the conversion circuit according to the voltage setting value and the preset voltage threshold value includes:

[0030] When the voltage setting value is less than or equal to the first preset voltage threshold, it is determined that the target operating mode to be switched by the conversion circuit is the first operating mode, and the first operating mode is an operating 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 the first active end state;

[0031] When the voltage setting value is greater than the first preset voltage threshold and less than or equal to the second preset voltage threshold, it is determined that the target operating mode to be switched by the conversion circuit is the second operating mode, and the second operating mode is an operating 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 the second active end state;

[0032] When the voltage setting value is greater than the second preset voltage threshold and less than or equal to the third preset voltage threshold, it is determined that the target operating mode to be switched by the conversion circuit is the third operating mode, and the third operating mode is an operating 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 active end state;

[0033] When the voltage setting value is greater than the third preset voltage threshold, it is determined that the target operating mode to which the conversion circuit needs to switch is the fourth operating mode, and the third operating mode is an operating 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 active end state.

[0034] In a third aspect, an embodiment of the present invention provides a control chip, and the control chip includes the control method of the conversion circuit of the second aspect.

[0035] In a fourth aspect, an embodiment of the present invention provides a charging pile, and the charging pile includes the conversion circuit of the first aspect or a control method of a conversion circuit of the second aspect.

[0036] In a fifth aspect, an embodiment of the present invention provides an electronic device, comprising: a processor and a memory, the processor is connected to the memory, the memory is used to store computer programs, the processor is used to execute the computer programs stored in the memory, and the electronic device executes the control method of the above-mentioned conversion circuit.

[0037] In a sixth aspect, an embodiment of the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and the computer program is executed by a processor to include a control method for the above-mentioned conversion circuit.

[0038] Implementing the embodiments of the present invention has the following beneficial effects:

[0039] It can be seen that the embodiment of the present invention invents a conversion circuit, in which the filter circuit is arranged at the front end of the interlock switching circuit, so that the output current of the first output rectifier circuit and the second output rectifier circuit can be consistent when they are output in parallel, avoiding the overcurrent risk caused by uneven current in the two paths. At the same time, the second switch and the third switch are coupled to avoid the problem of output DC bus short circuit caused by asynchronous switching of the relay switch, which is beneficial to improving the stability and reliability of the power module. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0041] Figure 1 A schematic diagram of a conversion circuit provided in an embodiment of the present application;

[0042] Figure 2 is a circuit diagram of a conversion circuit provided in an embodiment of the present application;

[0043] Figure 3 is an equivalent diagram of a conversion circuit provided in an embodiment of the present application;

[0044] Figure 4 is an equivalent diagram of another conversion circuit provided in an embodiment of the present application;

[0045] Figure 5 is an equivalent diagram of another conversion circuit provided in an embodiment of the present application;

[0046] Figure 6 is a circuit diagram of another conversion circuit provided in an embodiment of the present application;

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

[0048] Figure 8 It is a structural schematic diagram of an electronic device provided in an embodiment of the present application;

[0049] Fig. 9This is a block diagram of the functional units of a control chip provided in an embodiment of the present application. DETAILED DESCRIPTION

[0050] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0051] The terms "first", "second", "third" and "fourth" in the specification, claims and drawings of the present invention are used to distinguish different objects rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units that are not listed, or may optionally include other steps or units that are inherent to these processes, methods, products or devices.

[0052] Reference to "embodiments" herein means that a particular feature, result, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0053] In order to facilitate understanding of the technical solution of this application, the relevant technologies involved in this application are first introduced.

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

[0055] See also Figure 2 , Figure 2 It is a circuit diagram of a conversion circuit provided by an embodiment of the present application, wherein 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 moving end of the first switch K1 is connected to the first end of the first sub-primary winding S1, the second moving end of the first switch K1 is respectively connected to the second end of the first sub-primary winding S1 and the first end of the second sub-primary winding S2, and the first fixed end of the first switch K1 is connected to the primary conversion circuit 10. Vo is the output voltage.

[0056] Optionally, the interlock switching circuit 40 includes a second switch K2 and a third switch K3, the second fixed end of the second switch K2 is connected to the first output rectifier circuit 31, the third moving end of the second switch K2 is connected to the fifth moving end of the third switch K3, the fourth moving end of the second switch K2 is connected to the second end of the output bus capacitor Co, the third fixed end of the third switch K3 is connected to the second filter circuit 34, and the sixth moving end 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 includes 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 respectively connected to the first end of the first sub-secondary winding S3 and the first end of the second rectifier diode D2, the first end of the first rectifier diode D1 is respectively connected to the first end of the third rectifier diode D3 and the first filter circuit 33, the second end of the third rectifier diode D3 is respectively connected to the first end of the fourth rectifier diode D4 and the second end of the first sub-secondary winding S3, the second end of the fourth rectifier diode D4 is respectively connected to the second end of the second rectifier diode D2 and the second end of the second switch K2 Fixed end; the second output rectifier circuit 32 includes 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 respectively connected to the first end of the second sub-secondary winding S4 and the first end of the sixth rectifier diode D6, the first end of the fifth rectifier diode D5 is respectively connected to the first end of the seventh rectifier diode D7 and the second filtering circuit 34, the second end of the seventh rectifier diode D7 is respectively connected to the first end of the eighth rectifier diode D8 and the second end of the second sub-secondary winding S4, and the second end of the eighth rectifier diode D8 is respectively connected to the second end of the sixth rectifier diode D6 and the second fixed end of the third switch K3.

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

[0059] Among them, the switch mentioned in the embodiment of this scheme includes but is not limited to a relay switch, and the switch can also be equivalently replaced by a bidirectional semiconductor power switch tube.

[0060] Optionally, the first filtering circuit 33 includes a second inductor L2, and the second filtering circuit 34 includes 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 embodiment of the present invention shows a conversion circuit, in which the filter circuit is arranged at the front end of the interlock switching circuit, so that the output current of the first output rectifier circuit and the second output rectifier circuit can be consistent when they are output in parallel, avoiding the overcurrent risk caused by uneven current in the two paths. At the same time, the second switch K2 and the third switch K3 are coupled to avoid the problem of output DC bus short circuit caused by asynchronous switching of the relay switch, which is beneficial to improving the stability and reliability of the power module.

[0063] See also Figure 3 , Figure 3 It is an equivalent diagram of a conversion circuit provided in an embodiment of the present application, wherein the second inductor L2 and the third inductor L3 are coupled; the first end of the second inductor L2 is connected to the second end of the fourth rectifier diode D4, and the second end of the second inductor L2 is connected to the second fixed end of the second switch K2; 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.

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

[0065] See also Figure 4 , Figure 4 It is an equivalent diagram of another conversion circuit provided in an embodiment of the present application, wherein 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 respectively connected to the first output rectifier circuit 31 and one end of the fifth switch K5, the other end of the fourth switch K4 is respectively connected to the second filter circuit 34 and the first end of the sixth switch K6, the other end of the fifth switch K5 is connected to the second output rectifier circuit 32, and the other end of the sixth switch is connected to the first filter circuit 33.

[0066] Among them, when the fourth switch K4 is closed and the fifth switch K5 is opened and the sixth switch is opened, the first output rectifier circuit 31 and the second output rectifier circuit 32 are connected in parallel, and when the fourth switch K4 is opened and 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] See also Figure 5 , Figure 5: is another equivalent diagram of a conversion circuit provided in an embodiment of the present application, wherein the transformer includes a first switch K1, a 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, a secondary winding includes a first sub-secondary winding S3 and a second sub-secondary winding S4, a fixed end of the first switch is connected to the primary conversion circuit 10, a first moving end of the first switch K1 is connected to a first end of the first sub-primary winding S1, and a second moving end of the first switch K1 is connected to a first end of the first sub-primary winding S1. The moving end is respectively connected to 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, the second sub-primary winding S2 is respectively connected to the primary conversion circuit 10 and the second end of the fourth sub-primary winding S6, the first sub-primary winding S1 and the second sub-primary winding S2 are coupled to the first sub-secondary winding S3, and the third sub-primary winding S5 and the fourth sub-primary winding S6 are coupled to the second sub-secondary winding S4.

[0068] It can be seen that the embodiment of the present invention shows a conversion circuit, in which the filter circuit is arranged at the front end of the interlock switching circuit, so that the output current of the first output rectifier circuit and the second output rectifier circuit can be consistent when they are output in parallel, avoiding the overcurrent risk caused by uneven current in the two paths. At the same time, the second switch K2 and the third switch K3 are coupled to avoid the problem of output DC bus short circuit caused by asynchronous switching of the relay switch, which is beneficial to improving the stability and reliability of the power module.

[0069] See also Figure 6 , Figure 6 : is a circuit diagram of another conversion circuit provided by an embodiment of the present application, wherein the primary 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 respectively connected to the first end of the input bus capacitor Vi and the first end of the third switch tube Q3, the second end of the first switch tube Q1 is respectively connected to the first end of the second switch tube Q2 and the first end of the first inductor L1, the second end of the second switch tube Q2 is respectively connected to the second end of the input bus capacitor Vi and the second end of the fourth switch tube Q4, the second end of the third switch tube Q3 is respectively connected to the first end of the fourth switch tube Q4 and the second end of the second sub-primary winding S2, the first inductor L1 is connected to the first end of the first capacitor Cd, the second end of the first capacitor Cd is connected to the first fixed end of the first switch K1, the first moving end of the first switch K1 is connected to the first end of the first sub-primary winding S1, and the second moving end of the first switch K1 is respectively connected to the second end of the first sub-primary winding S1 and the first end of the second sub-primary winding S2.

[0070] For further information, see Figure 7, Figure 7 It is a flow chart of a control method for a conversion circuit provided in an embodiment of the present application. The control method for the conversion circuit is described as follows: the control method for the conversion circuit is applied to a controller of a power module, and the power module includes the controller and a 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 manually set or system default, and is not limited here.

[0074] Step 702: Determine the target operating mode to which the conversion circuit needs to switch according to the voltage setting value and the preset voltage threshold.

[0075] Wherein, determining the target operating mode 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 the first preset voltage threshold, determining that the target operating mode to be switched by the conversion circuit is the first operating mode, the first operating mode is an operating 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 the first active end state; when the voltage setting value is greater than the first preset voltage threshold and less than or equal to the second preset voltage threshold, determining that the target operating mode to be switched by the conversion circuit is the second operating mode, the second operating mode is an operating 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 the first active end state. The first switch switches to an operating mode in a second moving end state; when the voltage setting value is greater than the second preset voltage threshold and less than or equal to the third preset voltage threshold, it is determined that the target operating mode to be switched by the conversion circuit is the third operating mode, and the third operating mode is an operating 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 moving end state; when the voltage setting value is greater than the third preset voltage threshold, it is determined that the target operating mode to be switched by the conversion circuit is the fourth operating mode, and the third operating mode is an operating 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 moving end state.

[0076] Among them, the first preset voltage threshold, the second preset voltage threshold and the third preset voltage threshold can be set manually or the system defaults to no limitation here.

[0077] When the conversion circuit is in the first working mode, the formula for calculating the output voltage gain Vo1 is as follows:

[0078]

[0079] Wherein, D is the equivalent duty cycle controlled by the phase-shifted full-bridge circuit, n is the winding turns ratio of the secondary side 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] When the conversion circuit is in the first operation mode, the formula for calculating the output current capacity Io1 is as follows:

[0081]

[0082] When the conversion circuit is in the second working mode, the formula for calculating the output voltage gain Vo2 is as follows:

[0083]

[0084] When the conversion circuit is in the second working mode, the formula for calculating the output current capacity Io2 is as follows:

[0085]

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

[0087]

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

[0089]

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

[0091]

[0092] When the conversion circuit is in the fourth working mode, the output current capacity Io4 is calculated as follows:

[0093]

[0094] Step 703: Control the conversion circuit to switch to the target working mode.

[0095] Among them, when switching from a low-voltage working mode to a high-voltage working mode, the switch can be made when the corresponding preset voltage threshold is reached. If switching from a high-voltage working mode to a low-voltage working mode, the working mode switch will be made only when the corresponding (preset voltage threshold - Vd) is reached. Vd is the preset hysteresis range voltage. Such a design can avoid frequent switching of working modes.

[0096] Before switching the switch, the main power switch tube driver of the power module must be turned off and a preset time must be delayed. The preset time can be set manually or by system default and is not limited here.

[0097] by Figure 2 For example, the controller controls the second switch K2 in the conversion circuit to switch to the third moving end, and the third switch to switch to the fifth moving end. At this 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 moving end, and the third switch to switch to the sixth moving end. At this time, the first rectifier circuit and the second rectifier circuit are connected in parallel.

[0098] Wherein, the conversion circuit includes: a voltage source; an input bus capacitor, the input bus capacitor is respectively connected to the voltage source and the primary conversion circuit; the primary conversion circuit, the primary conversion circuit is connected to a transformer; the transformer, the transformer is connected to a rectifier-filter combined switching circuit; the transformer includes 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 rectifier-filter combined switching circuit; the rectifier-filter combined switching circuit, the rectifier-filter combined switching circuit is connected to an interlocking switching circuit; the rectifier-filter combined switching circuit includes a first output rectifier circuit, a second output rectifier circuit, a first filtering circuit and a second filtering circuit; the first output rectifier circuit is respectively connected to the secondary winding and the first filtering circuit, and the second output rectifier circuit is respectively connected to the secondary winding and the second filtering circuit; the interlocking switching circuit, the interlocking switching circuit is connected to an output bus capacitor; the output bus capacitor.

[0099] It can be seen that in this example, the controller first obtains the voltage setting value, then determines the target operating mode that the conversion circuit needs to switch to based on the voltage setting value and the preset voltage threshold, and finally controls the conversion circuit to switch to the target operating mode, which can improve the intelligence of the conversion circuit switching operating mode.

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

[0101] Optionally, the interlock switching circuit includes a second switch and a third switch, the second fixed end of the second switch is connected to the first output rectifier circuit, the third moving end of the second switch is connected to the fifth moving end of the third switch, the fourth moving 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 moving end of the third switch is connected to the first end of the output bus capacitor.

[0102] Optionally, the interlock switching circuit includes 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 respectively connected to the first output rectifier circuit and one end of the fifth switch, the other end of the fourth switch is respectively connected to the second filter circuit and the first end of the sixth switch, 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.

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

[0104] Optionally, the first filtering circuit includes a second inductor, and the second filtering circuit includes 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] See also Figure 8 , Figure 8 is a schematic diagram of the structure of an electronic device provided in an embodiment of the present application, which is applied to a controller of a power module, wherein the power module includes the controller and a conversion circuit; Figure 8 As shown, the electronic device includes 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 execute the following steps by the processor:

[0108] Get the voltage setting value;

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

[0110] The conversion circuit is controlled to switch to the target operation mode.

[0111] Wherein, the conversion circuit includes: a voltage source; an input bus capacitor, the input bus capacitor is respectively connected to the voltage source and the primary conversion circuit; the primary conversion circuit, the primary conversion circuit is connected to a transformer; the transformer, the transformer is connected to a rectifier-filter combined switching circuit; the transformer includes 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 rectifier-filter combined switching circuit; the rectifier-filter combined switching circuit, the rectifier-filter combined switching circuit is connected to an interlocking switching circuit; the rectifier-filter combined switching circuit includes a first output rectifier circuit, a second output rectifier circuit, a first filtering circuit and a second filtering circuit; the first output rectifier circuit is respectively connected to the secondary winding and the first filtering circuit, and the second output rectifier circuit is respectively connected to the secondary winding and the second filtering circuit; the interlocking switching circuit, the interlocking switching circuit is connected to an output bus capacitor; the output bus capacitor.

[0112] It can be seen that in this example, the electronic device first obtains the voltage setting value, then determines the target operating mode that the conversion circuit needs to switch to based on the voltage setting value and the preset voltage threshold, and finally controls the conversion circuit to switch to the target operating mode, which can improve the intelligence of the conversion circuit switching the operating mode.

[0113] In a possible example, the target operating mode to be switched to by the conversion circuit is determined according to the voltage setting value and the preset voltage threshold, and the above program includes instructions for executing the following steps:

[0114] When the voltage setting value is less than or equal to the first preset voltage threshold, it is determined that the target operating mode to be switched by the conversion circuit is the first operating mode, and the first operating mode is an operating 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 the first active end state;

[0115] When the voltage setting value is greater than the first preset voltage threshold and less than or equal to the second preset voltage threshold, it is determined that the target operating mode to be switched by the conversion circuit is the second operating mode, and the second operating mode is an operating 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 the second active end state;

[0116] When the voltage setting value is greater than the second preset voltage threshold and less than or equal to the third preset voltage threshold, it is determined that the target operating mode to be switched by the conversion circuit is the third operating mode, and the third operating mode is an operating 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 active end state;

[0117] When the voltage setting value is greater than the third preset voltage threshold, it is determined that the target operating mode to which the conversion circuit needs to switch is the fourth operating mode, and the third operating mode is an operating 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 active end state.

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

[0119] Optionally, the interlock switching circuit includes a second switch and a third switch, the second fixed end of the second switch is connected to the first output rectifier circuit, the third moving end of the second switch is connected to the fifth moving end of the third switch, the fourth moving 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 moving end of the third switch is connected to the first end of the output bus capacitor.

[0120] Optionally, the interlock switching circuit includes 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 respectively connected to the first output rectifier circuit and one end of the fifth switch, the other end of the fourth switch is respectively connected to the second filter circuit and the first end of the sixth switch, 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 includes 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 respectively connected to the first end of the first sub-secondary winding and the first end of the second rectifier diode, the first end of the first rectifier diode is respectively connected to the first end of the third rectifier diode and the first filtering circuit, the second end of the third rectifier diode is respectively connected to the first end of the fourth rectifier diode and the second end of the first sub-secondary winding, and the second end of the fourth rectifier diode is respectively connected to the second end of the second rectifier diode and the second fixed end of the second switch; the second output rectifier circuit includes 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 respectively connected to the first end of the second sub-secondary winding and the first end of the second rectifier hexode, the first end of the fifth rectifier diode is respectively connected to the first end of the seventh rectifier diode and the second filtering circuit, the second end of the seventh rectifier diode is respectively connected to the first end of the eighth rectifier diode and the second end of the second sub-secondary winding, and the second end of the eighth rectifier diode is respectively connected to the second end of the sixth rectifier diode and the second fixed end of the third switch.

[0122] Optionally, the first filtering circuit includes a second inductor, and the second filtering circuit includes 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 fixed 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 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.

[0125] In the case of dividing each functional module into corresponding functional modules, Fig. 9 is a block diagram of the functional units of a control chip provided in an embodiment of the present application, such as Fig. 9 As shown, a controller applied to a power module, the power module includes the controller and a conversion circuit; the control chip includes: an acquisition unit 901, a determination unit 902 and a control unit 903, wherein,

[0126] The acquisition unit 901 is used to acquire a voltage setting value;

[0127] The determining unit 902 is used to determine the target operating mode to be switched by the conversion circuit according to the voltage setting value and the preset voltage threshold;

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

[0129] It can be seen that in this example, the control chip first obtains the voltage setting value, and then determines the target operating mode that the conversion circuit needs to switch to based on the voltage setting value and the preset voltage threshold. Finally, the conversion circuit is controlled to switch to the target operating mode, which can improve the intelligence of the conversion circuit switching operating mode.

[0130] In a possible example, the target operating mode to be switched to by the conversion circuit is determined according to the voltage setting value and the preset voltage threshold, and the above program includes instructions for executing the following steps:

[0131] When the voltage setting value is less than or equal to the first preset voltage threshold, it is determined that the target operating mode to be switched by the conversion circuit is the first operating mode, and the first operating mode is an operating 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 the first active end state;

[0132] When the voltage setting value is greater than the first preset voltage threshold and less than or equal to the second preset voltage threshold, it is determined that the target operating mode to be switched by the conversion circuit is the second operating mode, and the second operating mode is an operating 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 the second active end state;

[0133] When the voltage setting value is greater than the second preset voltage threshold and less than or equal to the third preset voltage threshold, it is determined that the target operating mode to be switched by the conversion circuit is the third operating mode, and the third operating mode is an operating 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 active end state;

[0134] When the voltage setting value is greater than the third preset voltage threshold, it is determined that the target operating mode to which the conversion circuit needs to switch is the fourth operating mode, and the third operating mode is an operating 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 active end state.

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

[0136] Optionally, the interlock switching circuit includes a second switch and a third switch, the second fixed end of the second switch is connected to the first output rectifier circuit, the third moving end of the second switch is connected to the fifth moving end of the third switch, the fourth moving 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 moving end of the third switch is connected to the first end of the output bus capacitor.

[0137] Optionally, the interlock switching circuit includes 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 respectively connected to the first output rectifier circuit and one end of the fifth switch, the other end of the fourth switch is respectively connected to the second filter circuit and the first end of the sixth switch, 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 includes 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 respectively connected to the first end of the first sub-secondary winding and the first end of the second rectifier diode, the first end of the first rectifier diode is respectively connected to the first end of the third rectifier diode and the first filtering circuit, the second end of the third rectifier diode is respectively connected to the first end of the fourth rectifier diode and the second end of the first sub-secondary winding, and the second end of the fourth rectifier diode is respectively connected to the second end of the second rectifier diode and the second fixed end of the second switch; the second output rectifier circuit includes 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 respectively connected to the first end of the second sub-secondary winding and the first end of the second rectifier hexode, the first end of the fifth rectifier diode is respectively connected to the first end of the seventh rectifier diode and the second filtering circuit, the second end of the seventh rectifier diode is respectively connected to the first end of the eighth rectifier diode and the second end of the second sub-secondary winding, and the second end of the eighth rectifier diode is respectively connected to the second end of the sixth rectifier diode and the second fixed end of the third switch.

[0139] Optionally, the first filtering circuit includes a second inductor, and the second filtering circuit includes 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 relevant contents of each step involved in the above method embodiment can be referred to the functional description of the corresponding functional module and will not be repeated here.

[0143] The electronic device provided in this embodiment is used to execute the control method of the above-mentioned conversion circuit, and thus can achieve the same effect as the above-mentioned implementation method.

[0144] In the case of an integrated unit, the electronic device may include a processing module, a storage module and a communication module. The processing module may be used to control and manage the actions of the electronic device, for example, it may be used to support the electronic device to execute the steps performed by the above-mentioned functional unit. The storage module may be used to support the electronic device to execute stored program codes and data, etc. The communication module may be used to support the communication between the electronic device and other devices.

[0145] Among them, the processing module can be a processor or a controller. It can implement or execute various exemplary logic boxes, modules and circuits described in conjunction with the disclosure of this application. The processor can also be a combination that implements computing functions, such as a combination of one or more microprocessors, a combination of digital signal processing (DSP) and a microprocessor, etc. The storage module can be a memory. The communication module can specifically be a device that interacts with other electronic devices, such as a radio frequency circuit, a Bluetooth chip, a Wi-Fi chip, etc.

[0146] An embodiment of the present application also provides a computer storage medium, wherein the computer storage medium stores a computer program for electronic data exchange, wherein the computer program enables a computer to execute part or all of the steps of any method described in the above method embodiments, and the above computer includes an electronic device.

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

[0148] It should be noted that, for the aforementioned method embodiments, for the sake of simplicity, they are all expressed as a series of action combinations, but those skilled in the art should be aware that the present application is not limited by the described order of actions, because according to the present application, certain steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present application.

[0149] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0150] In the several embodiments provided in the present application, it should be understood that the disclosed device can be implemented in other ways. For example, the device embodiments described above are only schematic, such as the division of the above-mentioned units, which is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, and the indirect coupling or communication connection of devices or units can be electrical or other forms.

[0151] The units described above as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0152] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0153] If the above-mentioned integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable memory. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a memory, including a number of instructions to enable a computer device (which can be a personal computer, server or network device, etc.) to perform all or part of the steps of the above-mentioned methods of each embodiment of the present application. The aforementioned memory includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, disk or CD-ROM and other media that can store program codes.

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

[0155] The embodiments of the present application are introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core idea of ​​the present application. At the same time, for general technical personnel in this field, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A conversion circuit, characterized in that: The conversion circuit comprises: Voltage source; An input bus capacitor, wherein the input bus capacitor is connected to the voltage source and the primary side conversion circuit respectively; The primary side conversion circuit is connected to a transformer; The transformer is connected to a rectifier-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 rectifier-filter combined switching circuit; The rectifier-filter combined switching circuit is connected to an interlocking switching circuit; the rectifier-filter combined switching circuit comprises a first output rectifier circuit, a second output rectifier circuit, a first filtering circuit and a second filtering circuit; the first output rectifier circuit is respectively connected to the secondary winding and the first filtering circuit, and the second output rectifier circuit is respectively connected to the secondary winding and the second filtering circuit; The interlock switching circuit is connected to the output bus capacitor; The output bus capacitor.

2. The conversion circuit according to claim 1, characterized in that: The primary conversion circuit includes 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 includes a first switch, the primary winding includes a first sub-primary winding and a second sub-primary winding, and the secondary winding includes a first sub-secondary winding and a second sub-secondary winding; The first end of the first switch tube is respectively connected to the first end of the input bus capacitor and the first end of the third switch tube, the second end of the first switch tube is respectively connected to the first end of the second switch tube and the first end of the first inductor, the second end of the second switch tube is respectively connected to the second end of the input bus capacitor and the second end of the fourth switch tube, the second end of the third switch tube is respectively connected to the first end of the fourth switch tube and the second end of the second sub-primary winding, 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 moving end of the first switch is connected to the first end of the first sub-primary winding, and the second moving end of the first switch is respectively connected to the second end of the first sub-primary winding and the first end of the second sub-primary winding.

3. The conversion circuit according to claim 1, characterized in that: The interlock switching circuit includes a second switch and a third switch, the second fixed end of the second switch is connected to the first output rectifier circuit, the third moving end of the second switch is connected to the fifth moving end of the third switch, the fourth moving 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 moving end of the third switch is connected to the first end of the output bus capacitor.

4. The conversion circuit according to claim 1, characterized in that: The interlock switching circuit includes 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 respectively connected to the first output rectifier circuit and one end of the fifth switch, the other end of the fourth switch is respectively connected to the second filter circuit and the first end of the sixth switch, 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.

5. The conversion circuit according to claim 3, characterized in that: The first output rectifier circuit includes 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 respectively connected to the first end of the first sub-secondary winding and the first end of the second rectifier diode, the first end of the first rectifier diode is respectively connected to the first end of the third rectifier diode and the first filter circuit, the second end of the third rectifier diode is respectively connected to the first end of the fourth rectifier diode and the second end of the first sub-secondary winding, and the second end of the fourth rectifier diode is respectively connected to the second end of the second rectifier diode and the second fixed end of the second switch; The second output rectifying circuit comprises a fifth rectifying diode, a sixth rectifying diode, a seventh rectifying diode and an eighth rectifying diode; The second end of the fifth rectifier diode is respectively connected to the first end of the second sub-secondary winding and the first end of the sixth rectifier diode, the first end of the fifth rectifier diode is respectively connected to the first end of the seventh rectifier diode and the second filter circuit, the second end of the seventh rectifier diode is respectively connected to the first end of the eighth rectifier diode and the second end of the second sub-secondary winding, and the second end of the eighth rectifier diode is respectively connected to the second end of the sixth rectifier diode and the second fixed end of the third switch.

6. The conversion circuit according to claim 5, characterized in that: The first filtering circuit includes a second inductor, and the second filtering circuit includes a third inductor.

7. The conversion circuit according to claim 6, characterized in that: 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 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.

8. The conversion circuit according to claim 6, characterized in that: The second inductor is coupled to the third inductor; 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.

9. A control method for a conversion circuit, characterized in that: A controller applied to a power module, the power module comprising the controller and a conversion circuit according to any one of claims 1 to 8; the method comprising: Get the voltage setting value; Determining a target operating mode to be switched by the conversion circuit according to a voltage setting value and a preset voltage threshold; The conversion circuit is controlled to switch to the target operation mode.

10. The method according to claim 9, characterized in that The step of determining the target operating mode to be switched by the conversion circuit according to the voltage setting value and the preset voltage threshold comprises: When the voltage setting value is less than or equal to the first preset voltage threshold, it is determined that the target operating mode to be switched by the conversion circuit is the first operating mode, and the first operating mode is an operating 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 the first active end state; When the voltage setting value is greater than the first preset voltage threshold and less than or equal to the second preset voltage threshold, it is determined that the target operating mode to be switched by the conversion circuit is the second operating mode, and the second operating mode is an operating 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 the second active end state; When the voltage setting value is greater than the second preset voltage threshold and less than or equal to the third preset voltage threshold, it is determined that the target operating mode to be switched by the conversion circuit is the third operating mode, and the third operating mode is an operating 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 active end state; When the voltage setting value is greater than the third preset voltage threshold, it is determined that the target operating mode to which the conversion circuit needs to switch is the fourth operating mode, and the third operating mode is an operating 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 active end state.

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