Three-phase rectification buck-boost conversion circuit

Abstract

The utility model provides a three-phase rectification buck-boost conversion circuit, which comprises a three-phase rectification buck-boost conversion module and an automatic voltage regulation module, and is characterized in that the three-phase power input end of the three-phase rectification buck-boost conversion module is connected with three-phase power, the output end of the three-phase rectification buck-boost conversion module is connected with one end of a load, and the output end of the three-phase rectification buck-boost conversion module is connected with the automatic voltage regulation module. And the other end of the load is connected to the automatic voltage regulating module. And the automatic voltage regulation module realizes a voltage regulation function on the load voltage, so that the load is protected from overvoltage failure, and the flexibility is higher.

Description

Technical Field

[0001] This application relates to the field of buck-boost converter circuit technology, and in particular to a three-phase rectifier buck-boost converter circuit. Background Technology

[0002] A three-phase full-bridge step-up / step-down converter is a power electronic converter used to convert three-phase alternating current to direct current or to regulate DC voltage. It combines the functions of three-phase rectification and step-up / step-down conversion and is widely used in industries such as renewable energy and electric vehicles.

[0003] Conventional buck-boost converter circuits lack automatic voltage regulation and are not very flexible. Utility Model Content

[0004] In view of this, the purpose of this application is to provide at least one three-phase rectifier buck-boost converter circuit, which uses an automatic voltage regulation module to regulate the load voltage, protect the load from overvoltage failure, and provides greater flexibility.

[0005] This application mainly includes the following aspects:

[0006] In a first aspect, embodiments of this application provide a three-phase rectifier step-up / step-down converter circuit, which includes a three-phase rectifier step-up / step-down converter module and an automatic voltage regulation module. The three-phase power input terminal of the three-phase rectifier step-up / step-down converter module is connected to three-phase power, the output terminal of the three-phase rectifier step-up / step-down converter module is connected to one end of the load, and the other end of the load is connected to the automatic voltage regulation module.

[0007] In one possible implementation, the automatic voltage regulation module includes a comparator unit and a controller, wherein a first input terminal of the comparator unit is connected to the other end of the load, a second input terminal of the comparator unit is connected to a reference voltage, and the output terminal of the comparator unit is connected to the controller.

[0008] In one possible implementation, the comparison unit includes a current-sensing resistor and a comparator, wherein one end of the current-sensing resistor is connected to the other end of the load, the other end of the current-sensing resistor is connected to the non-inverting input of the comparator, the inverting input of the comparator is connected to a reference voltage, the positive power supply input of the comparator is connected to a power supply, the negative power supply input of the comparator is grounded, and the output of the comparator is connected to a controller.

[0009] In one possible implementation, the three-phase rectifier buck-boost converter module includes a three-phase rectifier bridge and a buck-boost converter unit, wherein the three-phase input terminals of the three-phase rectifier bridge are connected to a three-phase power supply, the output terminals of the three-phase rectifier bridge are connected to the input terminals of the buck-boost converter unit, the control terminals of the buck-boost converter unit are connected to a controller, and the output terminals of the buck-boost converter unit are connected to a load.

[0010] In one possible implementation, the three-phase rectifier bridge includes rectifier bridge arms connected in parallel to each phase. For each rectifier bridge arm, the power input terminal of the rectifier bridge arm is connected to the corresponding phase, the first connection terminal of the rectifier bridge arm is connected to the first input terminal of the buck-boost converter, and the second connection terminal of the rectifier bridge arm is connected to the second input terminal of the buck-boost converter.

[0011] In one possible implementation, the buck-boost converter unit includes a boost control component and a buck control component. The control terminal of the boost control component is connected to a controller, the first connection terminal of the boost control component is connected to the first connection terminal of the rectifier bridge arm in the three-phase rectifier bridge, and the second connection terminal of the boost control component is connected to the second connection terminal of the rectifier bridge arm and the non-inverting input terminal of the comparator in the automatic voltage regulation module, respectively. The control terminal of the buck control component is connected to the controller, the first connection terminal of the buck control component is connected to the load, and the second connection terminal of the buck control component is connected to the first connection terminal of the rectifier bridge arm.

[0012] In one possible implementation, the buck-boost converter unit further includes an inductor, one end of which is connected to the first connection terminal of the rectifier bridge arm, and the other end of which is connected to the first connection terminal of the boost control component and the second connection terminal of the buck control component.

[0013] In one possible implementation, the buck-boost converter unit further includes a first capacitor and a second capacitor, wherein one end of the first capacitor is connected to a first connection terminal of the rectifier bridge arm, and the other end of the first capacitor is connected to a second connection terminal of the rectifier bridge arm and a non-inverting input terminal of the comparator, respectively; one end of the second capacitor is connected to a first connection terminal of the load, and the other end of the second capacitor is connected to a second connection terminal of the rectifier bridge arm and a non-inverting input terminal of the comparator, respectively.

[0014] In one possible implementation, the boost control assembly includes a first control switch, a first gate resistor, and a first driver, wherein the control terminal of the first control switch is connected to the controller in sequence through the first gate resistor and the first driver, the first connection terminal of the first control switch is connected to the other end of the inductor, and the second connection terminal of the first control switch is connected to the second connection terminal of the rectifier bridge arm and the non-inverting input terminal of the comparator, respectively.

[0015] In one possible implementation, the buck control component includes a second control switch, a second gate resistor, and a second driver, wherein the control terminal of the second control switch is connected to the controller in sequence through the second gate resistor and the second driver, the first connection terminal of the second control switch is connected to one end of the load, and the second connection terminal of the second control switch is connected to the other end of the inductor.

[0016] This application provides a three-phase rectifier-boost-voltage converter circuit, which includes a three-phase rectifier-boost-voltage converter module and an automatic voltage regulation module. The three-phase input terminal of the three-phase rectifier-boost-voltage converter module is connected to three-phase power, and the output terminal of the three-phase rectifier-boost-voltage converter module is connected to one end of the load. The other end of the load is connected to the automatic voltage regulation module. The automatic voltage regulation module regulates the load voltage, protecting the load from overvoltage failure and providing greater flexibility.

[0017] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This illustration shows one of the structural schematic diagrams of a three-phase rectifier buck-boost converter circuit provided in an embodiment of this application;

[0020] Figure 2 This is a second schematic diagram of a three-phase rectifier buck-boost converter circuit provided in an embodiment of this application;

[0021] Figure 3 This illustration shows one of the operational schematic diagrams of a three-phase rectifier buck-boost converter circuit in the boost process according to an embodiment of this application;

[0022] Figure 4 This is shown as a second schematic diagram of the operation of a three-phase rectifier buck-boost converter circuit in the boost process according to an embodiment of this application;

[0023] Figure 5 This illustration shows one of the schematic diagrams of a three-phase rectifier buck-boost converter circuit in the buck process according to an embodiment of this application;

[0024] Figure 6 This is shown as a second schematic diagram of the operation of a three-phase rectifier buck-boost converter circuit in the buck process according to an embodiment of this application. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. It should be understood that the drawings in this application are for illustrative and descriptive purposes only and are not intended to limit the scope of protection of this application. Furthermore, it should be understood that the schematic drawings are not drawn to scale. The flowcharts used in this application illustrate operations implemented according to some embodiments of this application. It should be understood that the operations in the flowcharts may not be implemented in sequence, and steps without logical contextual relationships may be reversed or implemented simultaneously. In addition, those skilled in the art, guided by the content of this application, may add one or more other operations to the flowcharts, or remove one or more operations from the flowcharts.

[0026] Furthermore, the described embodiments are merely some, not all, of the embodiments of this application. The components of the embodiments of this application described and illustrated herein can typically be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0027] A three-phase full-bridge buck-boost converter is a power electronic converter used to convert three-phase AC power to DC power or regulate DC voltage. It combines the functions of three-phase rectification and buck-boost conversion and is widely used in industries, renewable energy, electric vehicles and other fields. Conventional buck-boost converters do not have automatic voltage regulation function and are not very flexible.

[0028] Based on this, this application provides a three-phase rectifier buck-boost converter circuit that uses an automatic voltage regulation module to regulate the load voltage, protecting the load from overvoltage failure and offering greater flexibility, as detailed below:

[0029] Please see Figure 1 , Figure 1 This illustration shows one of the structural schematic diagrams of a three-phase rectifier-boost converter circuit provided in an embodiment of this application. For example... Figure 1 As shown, the three-phase rectifier step-up converter circuit provided in this application embodiment includes a three-phase rectifier step-up converter module 1 and an automatic voltage regulation module 2. The three-phase input terminals of the three-phase rectifier step-up converter module 1 are connected to three-phase electricity U, V and W. The output terminal of the three-phase rectifier step-up converter module 1 is connected to one end of the load, and the other end of the load is connected to the automatic voltage regulation module 2.

[0030] In a preferred embodiment, please refer to Figure 2 , Figure 2This is shown as a second schematic diagram of a three-phase rectifier-boost converter circuit according to an embodiment of this application. Figure 2 As shown, the automatic voltage regulation module 2 includes a comparison unit 21 and a controller MCU.

[0031] Preferably, the first input terminal of the comparison unit 21 is connected to the other end of the load, the second input terminal of the comparison unit 21 is connected to the reference voltage Vref, and the output terminal of the comparison unit 21 is connected to the controller MCU.

[0032] In another preferred embodiment, the comparison unit 21 includes a current sensing resistor R1 and a comparator, wherein one end of the current sensing resistor R1 is connected to the other end of the load, the other end of the current sensing resistor R1 is connected to the non-inverting input of the comparator 210, the inverting input of the comparator 210 is connected to the reference voltage Vref, the positive power supply input of the comparator 210 is connected to the power supply VCC, the negative power supply input of the comparator 210 is grounded to GND, and the output of the comparator 210 is connected to the controller MCU.

[0033] Preferably, the power supply VCC can be 5V, and the current sensing resistor R1 has a very small and negligible resistance value, which will not affect the circuit. The comparator 210 calculates the loop voltage by comparing the current flowing through the current sensing resistor R1, and compares the calculated voltage value with Vref. When the loop voltage is higher than Vref, the comparator 210 outputs a high level to the controller MCU. When the loop voltage is lower than Vref, the comparator 210 outputs a low level to the controller MCU.

[0034] In a preferred embodiment, the three-phase rectifier buck-boost converter module 1 includes a three-phase rectifier bridge 11 and a buck-boost converter unit 12. The three-phase input terminals of the three-phase rectifier bridge 11 are connected to the three-phase power supply U, V and W. The output terminal of the three-phase rectifier bridge 11 is connected to the input terminal of the buck-boost converter unit 12. The control terminal of the buck-boost converter unit 12 is connected to the controller MCU. The output terminal of the buck-boost converter unit 12 is connected to the load.

[0035] In a preferred embodiment, the three-phase rectifier bridge 11 includes rectifier bridge arms connected in parallel to each phase. For each rectifier bridge arm, the power input terminal of the rectifier bridge arm is connected to the corresponding phase, the first connection terminal of the rectifier bridge arm is connected to the first input terminal of the buck-boost converter unit 12, and the second connection terminal of the rectifier bridge arm is connected to the second input terminal of the buck-boost converter unit 12.

[0036] The rectifier bridge arm is formed by two diodes connected in series, preferably, such as Figure 2As shown, the three-phase rectifier bridge 11 includes a first rectifier bridge arm formed by a first diode D1 and a second diode D2 connected in series, a second rectifier bridge arm formed by a third diode D3 and a fourth diode D4 connected in series, and a third rectifier bridge arm formed by a fifth diode D5 and a sixth diode D6.

[0037] In this configuration, the cathode of the first diode D1 is connected to the anode of the second diode D2, and the power input terminal corresponding to the first rectifier bridge arm is led out and connected to the phase power U. The cathode of the third diode D3 and the anode of the fourth diode D4 are connected, and the power input terminal corresponding to the second rectifier bridge arm is led out and connected to the phase power V. The cathode of the fifth diode D5 and the anode of the sixth diode D6 are connected, and the power input terminal corresponding to the third rectifier bridge arm is led out and connected to the phase power W. The cathodes of the second diode D2, the fourth diode D4, and the sixth diode D6 are connected and then connected to the first input terminal of the buck-boost converter unit 12. The anodes of the first diode D1, the third diode D3, and the fifth diode D5 are connected and then connected to the second input terminal of the buck-boost converter unit 12.

[0038] In a preferred embodiment, the buck-boost converter unit 12 includes a boost control component 121, a buck control component 122, and an inductor L. The control terminal of the boost control component 121 is connected to the controller MCU, and the first connection terminal of the boost control component 121 is connected to the first connection terminal of the rectifier bridge arm in the three-phase rectifier bridge via the inductor L (i.e.,...). Figure 2 The cathodes of the second diode D2, the fourth diode D4, and the sixth diode D6 are connected to the second connection terminals of the boost control assembly 121, respectively. Figure 2 The anodes of the first diode D1, the third diode D3, and the fifth diode D5 are connected to the non-inverting input of the comparator 210.

[0039] The control terminal of the buck control component 122 is connected to the controller MCU. The first connection terminal of the buck control component 122 is connected to the load. The second connection terminal of the buck control component 122 is connected to the first connection terminal of the rectifier bridge arm (i.e., ...) through the inductor L. Figure 2 (The cathodes of the second diode D2, the fourth diode D4, and the sixth diode D6).

[0040] In a preferred embodiment, the boost control assembly 121 includes a first control switch U1, a first gate resistor R2, and a first driver 1210. The control terminal of the first control switch U1 is connected to the controller MCU via the first gate resistor R2 and the first driver 1210. The first connection terminal of the first control switch U1 is connected to the other end of the inductor L, and the second connection terminal of the first control switch U1 is connected to the second connection terminal of the rectifier bridge arm (i.e.,...). Figure 2The anodes of the first diode D1, the third diode D3, and the fifth diode D5 are connected to the non-inverting input of the comparator 210.

[0041] In a preferred embodiment, the buck control component 122 includes a second control switch U2, a second gate resistor R3, and a second driver 1220. The control terminal of the second control switch U2 is connected to the controller MCU in sequence through the second gate resistor R3 and the second driver 1220. The first connection terminal of the second control switch U2 is connected to one end of the load, and the second connection terminal of the second control switch U2 is connected to the other end of the inductor L.

[0042] In one specific embodiment, the first control switch U1 and the second control switch U2 can be selected as IGBTs (Insulated Gate Bipolar Transistors). The first gate resistor R2 protects the first control switch U1, and the second gate resistor R3 protects the second control switch U2.

[0043] The first driver 1210 is used to drive the first control switch U1, and the second driver is used to drive the second control switch U2.

[0044] In a preferred embodiment, the buck-boost converter unit 12 further includes a first capacitor C1 and a second capacitor C2, wherein one end of the first capacitor C1 is connected to the first connection terminal of the rectifier bridge arm and one end of the inductor L, and the other end of the first capacitor C1 is connected to the second connection terminal of the rectifier bridge arm and the non-inverting input terminal of the comparator 210, and one end of the second capacitor C2 is connected to the first connection terminal of the load, and the other end of the second capacitor C2 is connected to the second connection terminal of the rectifier bridge arm and the non-inverting input terminal of the comparator 210.

[0045] In a preferred embodiment, the operation of the three-phase rectifier-boost converter circuit provided in this application is as follows:

[0046] U, V, and W are three-phase electricity, which are input to the buck-boost converter unit 12 after passing through the three-phase rectifier bridge 11. At this time, the circuit is not over-voltage. The controller MCU outputs a PWM signal to the first control switch U1 through the first driver 1210 and the first gate resistor R2. The controller MCU outputs a low-level signal to the second control switch U2 through the second driver 1220 and the second gate resistor R3 to control the second control switch U2 to turn off. At this time, a boost circuit is formed and the circuit is in the boost stage.

[0047] Please see Figure 3 , Figure 3 This diagram illustrates one of the operational schematics of a three-phase rectifier-boost converter circuit during the boost process, according to an embodiment of this application. Please refer to... Figure 4 , Figure 4This is shown as a second schematic diagram of the operation of a three-phase rectifier buck-boost converter circuit in the boost process according to an embodiment of this application.

[0048] When the circuit is in the boost phase, such as Figure 3 As shown, when the first control switch U1 is turned on, the inductor L is in a charging state, as... Figure 4 As shown, when the first control switch U1 is closed, the inductor L is in a discharging state, which causes the three-phase voltage to rise and be applied to the load, and the whole process realizes the step-up conversion.

[0049] When the circuit is in the boost phase, the voltage increases and is applied to both ends of the load. The current flows through the load to the current sensing resistor R1. The current sensing resistor R1 collects the current at this time and transmits it to the comparator 210. The comparator 210 obtains the load voltage after internal calculation and compares it with Vref. If the load voltage is higher than Vref, the comparator 210 outputs a high level to the controller MCU. If the load voltage is lower than Vref, the comparator 210 outputs a low level to the controller MCU. When the controller MCU receives the low level signal from the comparator 210, it confirms that the circuit has not reached the reference voltage Vref. At this time, it continuously outputs a PWM signal to the first control switch U1 and continuously outputs a low level signal to the second control switch U2. When the controller MCU receives the high level signal from the comparator 210, it confirms that the circuit is higher than the reference voltage Vref. At this time, the circuit is overvoltage, so it stops outputting the PWM signal to the first control switch U1 and controls the first control switch U1 to turn off.

[0050] In another preferred embodiment, when the circuit is overvoltaged, the controller MCU outputs a low-level signal to the first control switch U1 through the first driver 1210 and the first gate resistor R2 to control the first control switch U1 to close. The controller MCU outputs a PWM signal to the second control switch U2 through the second driver 1220 and the second gate resistor R3. At this time, a step-down circuit is formed, and the circuit is in the step-down stage.

[0051] Please see Figure 5 , Figure 5 This diagram illustrates one of the operational schematics of a three-phase rectifier buck-boost converter circuit according to an embodiment of this application during the buck process. Please refer to... Figure 6 , Figure 6 This is shown as a second schematic diagram of the operation of a three-phase rectifier buck-boost converter circuit in the buck process according to an embodiment of this application.

[0052] When the circuit is in the step-down phase, such as Figure 5 As shown, when the second control switch U2 is turned on, the inductor L is in a charging state, as... Figure 6 As shown, when the second control switch U2 is closed, the inductor L is in freewheeling mode, which reduces the load voltage to the three-phase voltage, and the whole process realizes step-down conversion.

[0053] When the circuit is in the step-down phase: when the second control switch U2 is opened, the inductor charges, and the charging direction is as follows: Figure 5 As shown, when the second control switch U2 is closed, the inductor L is in freewheeling mode and the current direction remains unchanged. It is superimposed with the output current of the three-phase rectifier bridge, causing the load voltage to drop to the three-phase voltage. Throughout the process, the comparator 210 compares the load voltage and the reference voltage Vref in real time. Once the load voltage is lower than the reference voltage Vref, the controller executes the boost process.

[0054] The advantages of this application are:

[0055] The first control switch U1 is connected in parallel across the three-phase rectifier bridge as a boost switching control device, and the second control switch U2 is connected in series at the positive terminal of the three-phase rectifier bridge as a buck switching control device. It can output a large voltage from a small voltage, which is low cost. If the voltage is over-boosted, it can be controlled to buck. The load voltage is monitored by the controller MCU and comparator to realize the voltage regulation function, protect the load from over-voltage failure, and make it more flexible.

[0056] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems and devices described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here. In the several embodiments provided in this application, it should be understood that the disclosed systems, devices, and methods can be implemented in other ways. The device embodiments described above are merely illustrative. For example, the division of units is only a logical functional division; in actual implementation, there may be other division methods. Furthermore, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Another point is that the displayed or discussed mutual coupling or direct coupling or communication connection may be through some communication interfaces; the indirect coupling or communication connection of devices or units may be electrical, mechanical, or other forms.

[0057] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0058] In addition, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0059] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a processor-executable, non-volatile, computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0060] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A three-phase rectifier-boost converter circuit, characterized in that, The three-phase rectifier step-up / step-down converter circuit includes a three-phase rectifier step-up / step-down converter module and an automatic voltage regulation module. The three-phase input terminal of the three-phase rectifier step-up / step-down converter module is connected to three-phase power, the output terminal of the three-phase rectifier step-up / step-down converter module is connected to one end of the load, and the other end of the load is connected to the automatic voltage regulating module.

2. The three-phase rectifier-boost converter circuit according to claim 1, characterized in that, The automatic voltage regulation module includes a comparison unit and a controller. The first input terminal of the comparison unit is connected to the other end of the load, the second input terminal of the comparison unit is connected to the reference voltage, and the output terminal of the comparison unit is connected to the controller.

3. The three-phase rectifier-boost converter circuit according to claim 2, characterized in that, The comparison unit includes a current-sensing resistor and a comparator. Wherein, one end of the current sensing resistor is connected to the other end of the load, the other end of the current sensing resistor is connected to the non-inverting input of the comparator, the inverting input of the comparator is connected to the reference voltage, the positive power supply input of the comparator is connected to the power supply, the negative power supply input of the comparator is grounded, and the output of the comparator is connected to the controller.

4. The three-phase rectifier-boost converter circuit according to claim 2, characterized in that, The three-phase rectifier buck-boost converter module includes a three-phase rectifier bridge and a buck-boost converter unit. The three-phase input terminals of the three-phase rectifier bridge are connected to a three-phase power supply, the output terminals of the three-phase rectifier bridge are connected to the input terminals of the buck-boost converter unit, the control terminals of the buck-boost converter unit are connected to the controller, and the output terminals of the buck-boost converter unit are connected to the load.

5. The three-phase rectifier-boost converter circuit according to claim 4, characterized in that, The three-phase rectifier bridge includes rectifier bridge arms connected in parallel, corresponding to each phase of the electricity. For each rectifier bridge arm, the power input terminal of the rectifier bridge arm is connected to the corresponding phase power, the first connection terminal of the rectifier bridge arm is connected to the first input terminal of the buck-boost converter unit, and the second connection terminal of the rectifier bridge arm is connected to the second input terminal of the buck-boost converter unit.

6. The three-phase rectifier-boost converter circuit according to claim 4, characterized in that, The buck-boost converter unit includes a boost control component and a buck control component. The control terminal of the boost control component is connected to the controller, the first connection terminal of the boost control component is connected to the first connection terminal of the rectifier bridge arm in the three-phase rectifier bridge, and the second connection terminal of the boost control component is connected to the second connection terminal of the rectifier bridge arm and the non-inverting input terminal of the comparator in the automatic voltage regulation module, respectively. The control terminal of the buck control component is connected to the controller, the first connection terminal of the buck control component is connected to the load, and the second connection terminal of the buck control component is connected to the first connection terminal of the rectifier bridge arm.

7. The three-phase rectifier-boost converter circuit according to any one of claims 1-6, characterized in that, The buck-boost converter unit in the three-phase rectifier buck-boost converter module also includes an inductor. One end of the inductor is connected to the first connection terminal of the rectifier bridge arm in the three-phase rectifier buck-boost converter module, and the other end of the inductor is connected to the first connection terminal of the boost control component and the second connection terminal of the buck control component in the three-phase rectifier buck-boost converter module.

8. The three-phase rectifier-boost converter circuit according to any one of claims 1-6, characterized in that, The buck-boost converter unit in the three-phase rectifier buck-boost converter module also includes a first capacitor and a second capacitor. Wherein, one end of the first capacitor is connected to the first connection terminal of the rectifier bridge arm in the three-phase rectifier buck-boost converter module, and the other end of the first capacitor is connected to the second connection terminal of the rectifier bridge arm and the non-inverting input terminal of the comparator in the automatic voltage regulation module, respectively. One end of the second capacitor is connected to the first connection terminal of the load, and the other end of the second capacitor is connected to the second connection terminal of the rectifier bridge arm and the non-inverting input terminal of the comparator, respectively.

9. The three-phase rectifier-boost converter circuit according to claim 7, characterized in that, The boost control assembly includes a first control switch, a first gate resistor, and a first driver. The control terminal of the first control switch is connected to the controller in sequence through the first gate resistor and the first driver. The first connection terminal of the first control switch is connected to the other end of the inductor. The second connection terminal of the first control switch is connected to the second connection terminal of the rectifier bridge arm and the non-inverting input terminal of the comparator, respectively.

10. The three-phase rectifier-boost converter circuit according to claim 7, characterized in that, The buck control assembly includes a second control switch, a second gate resistor, and a second driver. The control terminal of the second control switch is connected to the controller in sequence through the second gate resistor and the second driver. The first connection terminal of the second control switch is connected to one end of the load, and the second connection terminal of the second control switch is connected to the other end of the inductor.

Images