Power conversion apparatus

Abstract

The invention provides power conversion equipment, and the equipment comprises an input detection module, the input end of the input detection module is used for being electrically connected with the R end, the S end, the T end and the N end of a power supply, and the input detection module is used for collecting a voltage difference value; the input end of the rectification control module is used for being electrically connected with the R end, the S end, the T end and the N end respectively, and the output end of the rectification control module is used for being electrically connected with a load; the input end of the load feedback module is used for being electrically connected with a load, and the load feedback module is used for collecting the required voltage of the load; the main control module is electrically connected with the output end of the input detection module, the control end of the rectification control module and the output end of the load feedback module, and the main control module is used for determining specification information of the power supply according to the voltage difference value and controlling the rectification control module to operate according to the specification information and the required voltage. And the alternating current of the power supply is output to the load after being rectified and regulated.

Description

Technical Field

[0001] The present application relates to the technical field of power conversion, and in particular to a power conversion device. Background Art

[0002] Servo drives generally adopt an AC-DC-AC power conversion topology, first converting the AC power of the power supply into DC power through a power conversion device, and then converting it into frequency-controllable AC power through an inverter device to drive the motor to operate.

[0003] Due to different application occasions of servo drives, different specifications of input power may be encountered, such as single-phase 220V, three-phase 380V, etc. If the products are exported to different countries and regions, the local power specifications may also be different from those in China. For example, the power specifications in Germany are single-phase 230V and three-phase 400V; the power specifications in Japan are single-phase 100V and three-phase 220V; the power specifications in the United States are single-phase 115V and three-phase 480V, etc.

[0004] In addition, the motor operating performance is related to the DC bus voltage. There are high-voltage motors and low-voltage motors. Different types of motors have different rated voltages and inconsistent load requirements.

[0005] Therefore, how to ensure that the power conversion device is compatible with power inputs of multiple specifications and meets different load requirements, thereby improving the adaptability of the power conversion device, is a technical problem that urgently needs to be solved. Summary of the invention

[0006] The main purpose of the present application is to provide a power conversion device, so as to at least solve the problem of poor power adaptability of the power conversion device in the prior art.

[0007] In order to achieve the above-mentioned purpose, according to one aspect of the present application, a power conversion device is provided, the power conversion device comprising: an input detection module, the input end of the input detection module is used to be electrically connected to the R end, the S end, the T end and the N end of the power supply, respectively, the input detection module is used to collect voltage difference values, the voltage difference values ​​include the voltage difference between the R end and the S end, the voltage difference between the S end and the T end, the voltage difference between the T end and the R end, and the voltage difference between the S end and the N end; a rectifier control module, the input end of the rectifier control module is used to be electrically connected to the R end, the S end, the T end and the N end They are electrically connected respectively, the output end of the rectification control module is used to be electrically connected to the load; a load feedback module, the input end of the load feedback module is used to be electrically connected to the load, and the load feedback module is used to collect the required voltage of the load; a main control module is electrically connected to the output end of the input detection module, the control end of the rectification control module and the output end of the load feedback module respectively, and the main control module is used to determine the specification information of the power supply according to the voltage difference, and control the operation of the rectification control module according to the specification information and the required voltage, so as to rectify and regulate the alternating current of the power supply and output it to the load.

[0008] Optionally, the specification information includes a voltage effective value and a power supply type, the power supply type is a single-phase power supply, a three-phase power supply without a neutral line, or a three-phase power supply with a neutral line, and the main control module is used to control the operation of the rectifier control module according to the specification information and the required voltage, including: the main control module is used to determine whether the working mode of the rectifier control module is a full-wave rectification mode, a bridgeless boost PFC (Power Factor Correction) mode, or a buck mode according to the relationship between the required voltage and the voltage effective value; the main control module is used to control the rectifier control module to be electrically connected to the power supply using a single-phase power supply connection mode when the power supply type is the single-phase power supply, and control the rectifier control module to operate in the working mode; the main control module is used to control the rectifier control module to be electrically connected to the power supply using a three-phase power supply connection mode when the power supply type is the three-phase power supply without a neutral line or the three-phase power supply with a neutral line, and control the rectifier control module to operate in the working mode.

[0009] Optionally, the main control module is used to determine whether the working mode of the rectification control module is a full-wave rectification mode, a bridgeless boost PFC mode or a buck mode according to the relationship between the required voltage and the effective value of the voltage, including: the main control module is used to determine that the working mode is the full-wave rectification mode when the required voltage is equal to the effective value of the voltage; the main control module is used to determine that the working mode is the bridgeless boost PFC mode when the required voltage is greater than the effective value of the voltage; the main control module is used to determine that the working mode is the buck mode when the required voltage is less than the effective value of the voltage.

[0010] Optionally, the main control module is further used to: when the rectification control module operates in the full-wave rectification mode and the maximum voltage is less than the undervoltage threshold, switch the working mode to the bridgeless boost PFC mode, and the maximum voltage is the effective value of the voltage. times; when the rectifier control module operates in the bridgeless boost PFC mode and the maximum voltage is greater than the overvoltage threshold or less than the undervoltage threshold, adjust the duty cycle of the switch tube in the rectifier control module so that the adjusted maximum voltage is not greater than the overvoltage threshold and not less than the undervoltage threshold; when the rectifier control module operates in the step-down mode and the maximum voltage is less than the undervoltage threshold, switch the operating mode to the full-wave rectification mode or the bridgeless boost PFC mode; when the rectifier control module operates in the full-wave rectification mode, the power type is the single-phase power supply or the three-phase power supply without neutral line, and the maximum voltage is greater than the overvoltage threshold, switch the operating mode to the step-down mode or control the rectifier control module to disconnect the electrical connection with the power supply; when the rectifier control module operates in the full-wave rectification mode, the power type is the single-phase power supply or the three-phase power supply without neutral line, and the maximum voltage is greater than the overvoltage threshold, When the three-phase power supply has a neutral line and the maximum voltage is greater than the overvoltage threshold, the rectifier control module is controlled to be electrically connected to the power supply using the single-phase power supply connection mode; when the rectifier control module operates in the step-down mode, the power supply type is the single-phase power supply or the three-phase power supply without a neutral line, and the maximum voltage is greater than the overvoltage threshold, the rectifier control module is controlled to disconnect the electrical connection with the power supply, or adjust the duty cycle of the switch tube so that the adjusted maximum voltage is not greater than the overvoltage threshold; when the rectifier control module operates in the step-down mode, the power supply type is the three-phase power supply with a neutral line, and the maximum voltage is greater than the overvoltage threshold, the rectifier control module is controlled to be electrically connected to the power supply using the single-phase power supply connection mode, or adjust the duty cycle of the switch tube so that the adjusted maximum voltage is not greater than the overvoltage threshold.

[0011] Optionally, the rectifier control module includes: a first switch tube, a second switch tube, a third switch tube, a fourth switch tube, a fifth switch tube and a sixth switch tube, wherein the control ends of the first switch tube, the second switch tube, the third switch tube, the fourth switch tube, the fifth switch tube and the sixth switch tube are respectively electrically connected to the main control module, the first ends of the first switch tube, the third switch tube and the fifth switch tube are electrically connected, the second end of the first switch tube is electrically connected to the first end of the second switch tube, the second end of the second switch tube is used to be electrically connected to the negative electrode of the load, the second end of the third switch tube is electrically connected to the first end of the fourth switch tube, and the second end of the fourth switch tube is used to be electrically connected to the negative electrode of the load. The first single-pole double-throw switch is electrically connected to the negative electrode of the load, the second end of the fifth switch tube is electrically connected to the first end of the sixth switch tube, and the second end of the sixth switch tube is used to be electrically connected to the negative electrode of the load; a first single-pole double-throw switch, the moving end control end of the first single-pole double-throw switch is electrically connected to the main control module, the first fixed end of the first single-pole double-throw switch is used to be electrically connected to the positive electrode of the load, the second fixed end of the first single-pole double-throw switch is suspended, and the moving end of the first single-pole double-throw switch is electrically connected to the first end of the first switch tube; a second single-pole double-throw switch, the moving end control end of the second single-pole double-throw switch is electrically connected to the main control module, and the first fixed end of the second single-pole double-throw switch is suspended. A first fixed end of a double-throw switch is electrically connected, and a second fixed end of the second single-pole double-throw switch is used to be electrically connected to the R end; a third single-pole double-throw switch, a moving end control end of the third single-pole double-throw switch is electrically connected to the main control module, a first fixed end of the third single-pole double-throw switch is used to be electrically connected to the T end, and a second fixed end of the third single-pole double-throw switch is used to be electrically connected to the N end; a first inductor, a first end of the first inductor is electrically connected to the moving end of the second single-pole double-throw switch, and a second end of the first inductor is electrically connected to the second end of the first switch tube; a second inductor, a first end of the second inductor is used to be electrically connected to the S end, and a second end of the second inductor is electrically connected to the second end of the third switch tube an end electrically connected to the third single-pole double-throw switch; a third inductor, a first end of the third inductor is electrically connected to the moving end of the third single-pole double-throw switch, and a second end of the third inductor is electrically connected to the second end of the fifth switch tube; a first diode, a cathode of the first diode is electrically connected to the first end of the first switch tube, and an anode of the first diode is electrically connected to the second end of the first switch tube; a second diode, a cathode of the second diode is electrically connected to the first end of the second switch tube, and an anode of the second diode is electrically connected to the second end of the second switch tube; a third diode, a cathode of the third diode is electrically connected to the first end of the third switch tube, and an anode of the third diode is electrically connected to the second end of the third switch tube;a fourth diode, wherein the cathode of the fourth diode is electrically connected to the first end of the fourth switch tube, and the anode of the fourth diode is electrically connected to the second end of the fourth switch tube; a fifth diode, wherein the cathode of the fifth diode is electrically connected to the first end of the fifth switch tube, and the anode of the fifth diode is electrically connected to the second end of the fifth switch tube; a sixth diode, wherein the cathode of the sixth diode is electrically connected to the first end of the sixth switch tube, and the anode of the sixth diode is electrically connected to the second end of the sixth switch tube. ;

[0012] Optionally, the rectifier control module is also used to: control the moving end of the first single-pole double-throw switch to be electrically connected to the first fixed end of the first single-pole double-throw switch, the moving end of the second single-pole double-throw switch to be electrically connected to the second fixed end of the second single-pole double-throw switch, and the moving end of the third single-pole double-throw switch to be electrically connected to the second fixed end of the third single-pole double-throw switch, and control the first switch tube, the second switch tube, the third switch tube, the fourth switch tube, the fifth switch tube and the sixth switch tube to be turned off, so that the rectifier control module adopts the single-phase power supply connection mode to be electrically connected to the power supply and operates in the full-wave rectification mode; control the moving end of the first single-pole double-throw switch to be electrically connected to the first fixed end of the first single-pole double-throw switch, the moving end of the second single-pole double-throw switch to be electrically connected to the second fixed end of the second single-pole double-throw switch, and the moving end of the third single-pole double-throw switch to be electrically connected to the second fixed end of the third single-pole double-throw switch. The invention relates to a method for electrically connecting a first single-pole double-throw switch and a second single-pole double-throw switch to a first single-pole double-throw switch; controlling the first switch tube, the second switch tube, the third switch tube and the fifth switch tube to be turned off, and controlling the switching states of the fourth switch tube and the sixth switch tube, so that the rectifier control module adopts the single-phase power supply connection mode to be electrically connected to the power supply and operates in the bridgeless boost PFC mode; controlling the moving end of the first single-pole double-throw switch to be electrically connected to the second fixed end of the first single-pole double-throw switch, the moving end of the second single-pole double-throw switch to be electrically connected to the first fixed end of the second single-pole double-throw switch, and the moving end of the third single-pole double-throw switch to be electrically connected to the second fixed end of the third single-pole double-throw switch, controlling the second switch tube, the third switch tube, the fourth switch tube, the fifth switch tube and the sixth switch tube to be turned off, and controlling the switching state of the first switch tube, so that the rectifier control module adopts the single-phase power supply connection mode to be electrically connected to the power supply and operates in the step-down mode.

[0013] Optionally, the rectifier control module is also used to: control the moving end of the first single-pole double-throw switch to be electrically connected to the first fixed end of the first single-pole double-throw switch, the moving end of the second single-pole double-throw switch to be electrically connected to the second fixed end of the second single-pole double-throw switch, and the moving end of the third single-pole double-throw switch to be electrically connected to the first fixed end of the third single-pole double-throw switch, and control the first switch tube, the second switch tube, the third switch tube, the fourth switch tube, the fifth switch tube and the sixth switch tube to be turned off, so that the rectifier control module adopts the three-phase power supply connection mode to be electrically connected to the power supply and operates in the full-wave rectification mode; control the moving end of the first single-pole double-throw switch to be electrically connected to the first fixed end of the first single-pole double-throw switch, the moving end of the second single-pole double-throw switch to be electrically connected to the second fixed end of the second single-pole double-throw switch, the moving end of the third single-pole double-throw switch to be electrically connected to the first fixed end of the third single-pole double-throw switch The moving end of the first single-pole double-throw switch is electrically connected to the second fixed end of the first single-pole double-throw switch, the moving end of the second single-pole double-throw switch is electrically connected to the first fixed end of the second single-pole double-throw switch, and the moving end of the third single-pole double-throw switch is electrically connected to the second fixed end of the third single-pole double-throw switch, the second switch tube, the third switch tube, the fourth switch tube, the fifth switch tube and the sixth switch tube are turned off, and the switching state of the first switch tube is controlled, so that the rectification control module is electrically connected to the power supply in the three-phase power connection mode and operates in the step-down mode.

[0014] Optionally, the input detection module includes: a first resistor, a first end of the first resistor is used to be electrically connected to the R end; a second resistor, a first end of the second resistor is used to be electrically connected to the S end, and the resistance value of the first resistor is the same as the resistance value of the second resistor; a first operational amplifier, a first input end of the first operational amplifier is electrically connected to the second end of the first resistor, and the second input end of the first operational amplifier is electrically connected to the second end of the second resistor; a third resistor, a first end of the third resistor is electrically connected to the output end of the first operational amplifier, and the second end of the third resistor is electrically connected to the main control module; a fourth resistor, a first end of the fourth resistor is electrically connected to the second input end of the first operational amplifier; a fifth resistor, a first end of the fifth resistor is used to be electrically connected to the T end, and the resistance value of the fourth resistor is the same as the resistance value of the fifth resistor; a second operational amplifier, a first input end of the second operational amplifier is electrically connected to the second end of the fourth resistor, and the second input end of the second operational amplifier is electrically connected to the second end of the fifth resistor; a sixth resistor, a first end of the sixth resistor is electrically connected to the output end of the second operational amplifier, and the second end of the sixth resistor is electrically connected to the main control module; a seventh resistor, a first end of the seventh resistor is electrically connected to the second input end of the second operational amplifier; an eighth resistor, a first end of the eighth resistor is electrically connected to the first input end of the first operational amplifier, and the resistance value of the seventh resistor is the same as the resistance value of the eighth resistor; a third operational amplifier, a first input end of the third operational amplifier is electrically connected to the second end of the seventh resistor, and the second input end of the third operational amplifier is electrically connected to the second end of the eighth resistor; a ninth resistor, a first end of the ninth resistor is electrically connected to the output end of the third operational amplifier, and the second end of the ninth resistor is electrically connected to the main control module; a tenth resistor, a first end of the tenth resistor is electrically connected to the second input end of the first operational amplifier; an eleventh resistor, a first end of the eleventh resistor is used to be electrically connected to the N end, and the resistance value of the tenth resistor is the same as the resistance value of the eleventh resistor; a fourth operational amplifier, a first input end of the fourth operational amplifier is electrically connected to the second end of the tenth resistor, and the second input end of the fourth operational amplifier is electrically connected to the second end of the eleventh resistor; a twelfth resistor, a first end of the twelfth resistor is electrically connected to the output end of the third operational amplifier, and the second end of the twelfth resistor is electrically connected to the main control module.

[0015] Optionally, the main control module is further used to receive the voltage difference between the R terminal and the S terminal through the third resistor, receive the voltage difference between the S terminal and the T terminal through the sixth resistor, receive the voltage difference between the T terminal and the R terminal through the ninth resistor, and receive the voltage difference between the S terminal and the N terminal through the twelfth resistor. The main control module is used to determine the specification information of the power supply according to the voltage difference, including: the main control module is used to determine the voltage difference between the R terminal and the S terminal, the voltage difference between the S terminal and the T terminal, and the voltage difference between the T terminal and the R terminal are zero, and the voltage between the S terminal and the N terminal is zero. The main control module is used to determine that the power type is a three-phase power supply without a neutral line when the voltage difference between the R terminal and the S terminal, the voltage difference between the S terminal and the T terminal, and the voltage difference between the T terminal and the R terminal are not zero, and the voltage difference between the S terminal and the N terminal is zero; the main control module is used to determine that the power type is a three-phase power supply with a neutral line when the voltage difference between the R terminal and the S terminal, the voltage difference between the S terminal and the T terminal, the voltage difference between the T terminal and the R terminal, and the voltage difference between the S terminal and the N terminal are all not zero.

[0016] Optionally, the power conversion device also includes: an output detection module, the input end of the output detection module is used to be electrically connected to the load, the output end of the output detection module is electrically connected to the main control module, and the output detection module is used to detect the actual voltage of the load; a main capacitor is connected in parallel across the positive electrode of the load and the negative electrode of the load; the main control module is also used to adjust the working mode of the rectifier control module when the absolute value of the difference between the actual voltage and the required voltage is greater than a predetermined threshold value, so that the adjusted absolute value of the difference is not greater than the predetermined threshold value.

[0017] By applying the technical solution of the present application, in the power conversion device of the present application, the input detection module and the rectifier control module are both provided with input terminals electrically connected to the R, S, T, and N terminals. The main control module determines the specification information of the power supply according to the voltage difference at the RS terminal, the ST terminal, the TR terminal, and the SN terminal of the input power supply, and controls the operation of the rectifier control module according to the specification information and the required voltage of the load, so that the direct current output by the rectifier control module meets the load requirement, thereby solving the technical problem in the prior art that the power conversion device is not compatible with power inputs of different specifications and cannot meet the requirements of different loads, resulting in poor power adaptability of the power conversion device, thereby ensuring the strong versatility of the power conversion device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings constituting part of the present application are used to provide a further understanding of the present application. The exemplary embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0019] Figure 1 A structural diagram of a power conversion module provided in an embodiment of the present application is shown;

[0020] Figure 2 A circuit structure diagram of a rectifier control module provided according to an embodiment of the present application is shown;

[0021] Figure 3 An equivalent circuit diagram of a rectifier control module electrically connected to a single-phase power supply and operating in a full-wave rectifier mode according to an embodiment of the present application is shown;

[0022] Figure 4 An equivalent circuit diagram of a rectifier control module electrically connected to a single-phase power supply and operating in a bridgeless boost PFC mode provided in an embodiment of the present application is shown;

[0023] Figure 5 An equivalent circuit diagram of a rectifier control module operating in a buck mode provided in an embodiment of the present application is shown;

[0024] Figure 6 An equivalent circuit diagram of a rectifier control module electrically connected to a three-phase power supply and operating in a full-wave rectifier mode according to an embodiment of the present application is shown;

[0025] Figure 7 An equivalent circuit diagram of a rectifier control module electrically connected to a three-phase power supply and operating in a bridgeless boost PFC mode provided in an embodiment of the present application is shown;

[0026] Figure 8 A circuit structure diagram of an input detection module provided according to an embodiment of the present application is shown;

[0027] Fig. 9 A structural diagram of another power conversion module provided in an embodiment of the present application is shown.

[0028] The above drawings include the following reference numerals:

[0029] 10. Input detection module; 11. Power supply; 12. Rectification control module; 13. Load; 14. Load feedback module; 15. Main control module; 16. First switch tube; 17. Second switch tube; 18. Third switch tube; 19. Fourth switch tube; 20. Fifth switch tube; 21. Sixth switch tube; 22. First single-pole double-throw switch; 23. Second single-pole double-throw switch; 24. Third single-pole double-throw switch; 25. First inductor; 26. Second inductor; 27. Third inductor; 28. First diode; 29. ​​Second diode; 30. Third diode; 31. Fourth diode tube; 32, the fifth diode; 33, the sixth diode; 34, the auxiliary capacitor; 35, the first resistor; 36, the second resistor; 37, the first operational amplifier; 38, the third resistor; 39, the fourth resistor; 40, the fifth resistor; 41, the second operational amplifier; 42, the sixth resistor; 43, the seventh resistor; 44, the eighth resistor; 45, the third operational amplifier; 46, the ninth resistor; 47, the tenth resistor; 48, the eleventh resistor; 49, the fourth operational amplifier; 50, the twelfth resistor; 51, the output detection module; 52, the main capacitor; 100, the power conversion device. DETAILED DESCRIPTION

[0030] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0031] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0032] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0033] As introduced in the background technology, there is a technical problem in the prior art that the power adaptability of the power conversion equipment is poor. To solve this technical problem, the embodiments of the present application provide a method for constructing a power conversion module that is compatible with power inputs of multiple specifications and a power conversion module device.

[0034] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0035] An embodiment of the present application provides a power conversion device, Figure 1 A structural block diagram of the power conversion device of the present application is shown as an example. Figure 1 As shown, the power conversion device 100 comprises:

[0036] An input detection module 10, wherein the input end of the input detection module 10 is used to be electrically connected to the R end, the S end, the T end and the N end of the power supply 11, respectively. The input detection module 10 is used to collect voltage difference values, wherein the voltage difference values ​​include the voltage difference between the R end and the S end, the voltage difference between the S end and the T end, the voltage difference between the T end and the R end, and the voltage difference between the S end and the N end;

[0037] Specifically, the input detection module has four input terminals, which correspond to the R terminal, S terminal, T terminal and N terminal of the power supply. The power supply is an AC power supply, and the R terminal, S terminal and T terminal of the power supply are three phase lines respectively, and the N terminal of the power supply is a neutral line.

[0038] A rectifier control module 12, wherein the input end of the rectifier control module 12 is used to be electrically connected to the R end, the S end, the T end and the N end respectively, and the output end of the rectifier control module 12 is used to be electrically connected to a load 13;

[0039] Specifically, the rectifier control module has four input terminals, which correspond to the R terminal, S terminal, T terminal and N terminal of the power supply. The rectifier control module is used to convert the AC power of the power supply into DC power available to the load, and the load is a DC load, including but not limited to the inverter module of the motor drive system, the DC charging device and the LED display module.

[0040] A load feedback module 14, wherein the input end of the load feedback module 14 is used to be electrically connected to the load 13, and the load feedback module 14 is used to collect the required voltage of the load;

[0041] Specifically, the required voltage is a voltage that satisfies the electrical parameters of the load, and is a voltage value that satisfies the operation of the load, including but not limited to the rated voltage of the load.

[0042] The main control module 15 is electrically connected to the output end of the input detection module 10, the control end of the rectification control module 12 and the output end of the load feedback module 14 respectively. The main control module 15 is used to determine the specification information of the power supply 11 according to the voltage difference, and control the operation of the rectification control module 12 according to the specification information and the required voltage, so as to rectify and regulate the AC power of the power supply 11 and output it to the load 13.

[0043] Through the above embodiments, in the above power conversion device, the input end of the input detection module is connected to the R end, S end, T end and N end of the power supply to collect the voltage difference of the RS end, ST end, TR end and SN end of the power supply to obtain the voltage difference; the input end of the rectifier control module is connected to the R end, S end, T end and N end of the power supply, and the output end is connected to the load; the load is connected to the load feedback module to collect the required voltage of the load; the output end of the input detection module, the control end of the rectifier control module and the output end of the load feedback module are connected through the main control module, so as to receive the voltage difference collected by the input detection module and the required voltage collected by the load feedback module, the main control module determines the specification information of the power supply according to the voltage difference, and controls the operation of the rectifier control module according to the specification information and the required voltage, so that the rectifier control module rectifies and regulates the AC power of the power supply and outputs it to the load. The input detection module and the rectifier control module of the present application are both provided with input terminals electrically connected to the R, S, T, and N terminals. The main control module determines the specification information of the power supply according to the voltage difference at the RS terminal, the ST terminal, the TR terminal, and the SN terminal of the input power supply, and controls the operation of the rectifier control module according to the specification information and the required voltage of the load, so that the direct current output by the rectifier control module meets the load demand, which solves the technical problem in the prior art that the power conversion equipment is not compatible with power inputs of different specifications and cannot meet the requirements of different loads, resulting in poor power adaptability of the power conversion equipment, and ensures that the power conversion equipment has strong versatility.

[0044] It should be noted that in the power conversion device of the present application, the input end of the input detection module and the input end of the rectifier control module can not only adapt to the three-phase power input with a neutral line, but also adapt to the single-phase and three-phase power input without a neutral line. That is to say, when the power supply is a three-phase power supply with a neutral line, the actual terminals of the power supply are four, and the four input ends of the input detection module and the four input ends of the rectifier control module are electrically connected to the four terminals of the power supply in a one-to-one correspondence; when the power supply is a three-phase power supply without a neutral line, the actual terminals of the power supply are three, and the four input ends of the input detection module and the four input ends of the rectifier control module are electrically connected to the three terminals of the power supply in a one-to-one correspondence, and the input detection module and the rectifier control module each have one input end suspended; when the power supply is a single-phase power supply, the actual terminals of the power supply are two, and the four input ends of the input detection module and the four input ends of the rectifier control module are electrically connected to the two terminals of the power supply in a one-to-one correspondence, and the input detection module and the rectifier control module each have two input ends suspended.

[0045] In addition to the above-mentioned required voltage, the above-mentioned load feedback module can also collect the working status of the above-mentioned load. Figure 1 As shown, the above-mentioned rectification control module 12 has two output terminals, one output terminal is electrically connected to the positive electrode DC+ of the load 13, and the other output terminal is electrically connected to the negative electrode DC- of the load 13.

[0046] In an optional scheme, the above-mentioned specification information includes the effective value of voltage and the type of power supply, and the above-mentioned power supply type is a single-phase power supply, a three-phase power supply without a neutral line, or a three-phase power supply with a neutral line. The above-mentioned main control module is used to control the operation of the above-mentioned rectifier control module according to the above-mentioned specification information and the above-mentioned required voltage, including: the above-mentioned main control module is used to determine whether the working mode of the above-mentioned rectifier control module is a full-wave rectification mode, a bridgeless boost PFC mode, or a buck mode according to the relationship between the above-mentioned required voltage and the above-mentioned effective value of the voltage; the above-mentioned main control module is used to control the above-mentioned rectifier control module to be electrically connected to the above-mentioned power supply using a single-phase power supply connection mode when the above-mentioned power supply type is the above-mentioned single-phase power supply, and control the above-mentioned rectifier control module to operate in the above-mentioned working mode; the above-mentioned main control module is used to control the above-mentioned rectifier control module to be electrically connected to the above-mentioned power supply using a three-phase power supply connection mode when the above-mentioned power supply type is the above-mentioned three-phase power supply without a neutral line or the three-phase power supply with a neutral line, and control the above-mentioned rectifier control module to operate in the above-mentioned working mode.

[0047] In the above embodiment, the main module intelligently selects the working mode of the rectifier control module as the full-wave rectifier mode, the bridgeless boost PFC mode or the buck mode according to the relationship between the required voltage and the effective value of the voltage, so that the rectifier control module operates in this working mode, so as to further ensure that the power conversion device can adapt to power supplies with different effective values ​​of voltage, and further ensure that the rectifier control module provides the load with the voltage it needs, thereby further ensuring that the power conversion device can adapt to different load requirements. In addition, the main control module also controls the rectifier control module to use the corresponding power connection method to be electrically connected to the power supply according to the type of power supply (single-phase power supply, three-phase power supply without neutral line or three-phase power supply with neutral line), so as to further ensure that the power conversion device can adapt to different types of power supplies, thereby further solving the problem of poor power adaptability of the power conversion device in the prior art.

[0048] Specifically, the above voltage effective value is the effective value of the alternating current provided by the power supply. Through the control of the above main control module, the circuit structure of the rectifier control module can be transformed, specifically, it can be transformed into a full-wave rectifier circuit to realize the operation of the above full-wave rectifier mode; it can also be transformed into a bridgeless boost PFC circuit to realize the above bridgeless boost PFC mode; it can also be transformed into a buck circuit to realize the above buck mode.

[0049] Furthermore, the main control module is used to determine whether the working mode of the rectification control module is a full-wave rectification mode, a bridgeless boost PFC mode or a buck mode according to the relationship between the required voltage and the effective value of the voltage, including: the main control module is used to determine that the working mode is the full-wave rectification mode when the required voltage is equal to the effective value of the voltage; the main control module is used to determine that the working mode is the bridgeless boost PFC mode when the required voltage is greater than the effective value of the voltage; the main control module is used to determine that the working mode is the buck mode when the required voltage is less than the effective value of the voltage.

[0050] In the above embodiment, when the required voltage of the load is equal to the effective value of the voltage, it means that the input voltage of the power supply matches the load demand, and it is only necessary to convert the AC power of the power supply into DC power to supply the load. At this time, it is determined that the rectification control module operates in full-wave rectification mode, so that the rectification control module can convert the AC power signal into a DC power signal and output the DC power signal stably and continuously to the load; when the required voltage of the load is greater than the effective value of the voltage, it means that the input voltage of the power supply is insufficient to meet the load demand. At this time, it is necessary not only to convert the AC power of the power supply into DC power to supply the load, but also to boost the input voltage of the power supply to the required voltage required by the load, so as to ensure the load. Normal operation, therefore, it is determined that the rectifier control module operates in the boost PFC mode, so that the rectifier control module can boost the AC signal to the required DC voltage, thereby meeting the load demand and improving the power factor and efficiency of the power supply; when the required voltage of the load is less than the effective value of the voltage, it means that the input voltage of the power supply exceeds the load demand. At this time, it is necessary not only to convert the AC power of the power supply into DC power to supply the load, but also to step down the input voltage of the power supply to the required voltage required by the load, thereby ensuring the safe power supply of the load, therefore, it is determined that the rectifier control module operates in the buck mode, so that the rectifier control module can step down the AC signal to the required DC voltage. Through the above embodiments, it can be further ensured that the power conversion device of the present application can meet the needs of different loads while being compatible with multiple specifications of power input, and further realize the high adaptability and high versatility of the power conversion device.

[0051] It should be noted that this application only exemplifies the embodiment in which the specification information includes the power type and the voltage effective value. In other embodiments, the specification information includes the power type and voltage information, and the voltage information includes but is not limited to at least one of the following: voltage effective value, voltage maximum value. The above voltage maximum value can be obtained; similarly, the above voltage maximum value / The above voltage effective value can be obtained.

[0052] In some other exemplary embodiments of the present application, the main control module is also used for:

[0053] When the rectification control module operates in the full-wave rectification mode and the maximum voltage is less than the undervoltage threshold, the operation mode is switched to the bridgeless boost PFC mode, and the maximum voltage is the effective value of the voltage. times;

[0054] Specifically, the above-mentioned undervoltage threshold is an undervoltage voltage value determined according to the design parameters of the above-mentioned power supply. Regardless of the type of power supply, whether it is a single-phase power supply, a three-phase power supply without a neutral line, or a three-phase power supply with a neutral line, when the rectification control module operates in a full-wave rectification mode and the maximum voltage of the above-mentioned power supply is greater than the undervoltage threshold, it indicates that the power supply currently has an undervoltage abnormality. At this time, the input voltage of the power supply needs to be boosted through the rectification control module to prevent the undervoltage abnormality of the power supply from affecting the normal operation of the load.

[0055] When the rectifier control module operates in the bridgeless boost PFC mode and the maximum voltage is greater than the overvoltage threshold or less than the undervoltage threshold, the duty cycle of the switch tube in the rectifier control module is adjusted so that the adjusted maximum voltage is not greater than the overvoltage threshold and not less than the undervoltage threshold;

[0056] Specifically, the above-mentioned overvoltage threshold is an overvoltage threshold determined according to the actual parameters of the above-mentioned power supply. Regardless of whether the power supply type is a single-phase power supply, a three-phase power supply without a neutral line, or a three-phase power supply with a neutral line, when the rectifier control module operates in a bridgeless boost PFC mode and the maximum voltage of the above-mentioned power supply is greater than the overvoltage threshold, it indicates that the power supply currently has an overvoltage abnormality. At this time, the duty cycle of the switch tube in the rectifier control module is adjusted to achieve voltage reduction control of the power supply input voltage; regardless of whether the power supply type is a single-phase power supply, a three-phase power supply without a neutral line, or a three-phase power supply with a neutral line, when the rectifier control module operates in a bridgeless boost PFC mode, and the maximum voltage of the above-mentioned power supply is less than the undervoltage threshold, it indicates that the power supply currently has an undervoltage abnormality. At this time, the duty cycle of the switch tube in the rectifier control module is adjusted to achieve voltage boost control of the power supply input voltage.

[0057] When the rectification control module operates in the buck mode and the maximum voltage is less than the undervoltage threshold, the operation mode is switched to the full-wave rectification mode or the bridgeless boost PFC mode;

[0058] Specifically, when the rectifier control module operates in the buck mode and the power supply has an undervoltage abnormality, boost regulation can be achieved by switching the working mode from the buck mode to the full-wave rectification mode or the bridgeless boost PFC mode.

[0059] When the rectification control module operates in the full-wave rectification mode, the power source is the single-phase power source or the three-phase power source without a neutral line, and the maximum voltage is greater than the overvoltage threshold, the operation mode is switched to the step-down mode or the rectification control module is controlled to disconnect the electrical connection with the power source;

[0060] Specifically, the working mode of the rectifier control module is switched from full-wave rectification mode to buck mode, which can achieve buck regulation of the power supply input voltage; in addition, by disconnecting the electrical connection between the rectifier control module and the power supply, the input voltage becomes 0, which can also play a voltage reduction role and avoid overvoltage abnormalities that burn out the load.

[0061] When the rectification control module operates in the full-wave rectification mode, the power source type is the three-phase power source with a neutral line, and the maximum voltage is greater than the overvoltage threshold, the rectification control module is controlled to be electrically connected to the power source in the single-phase power connection mode;

[0062] Specifically, when the rectifier control module operates in full-wave rectification mode, the power supply type is a three-phase power supply with a neutral line, and there is an overvoltage abnormality in the power supply, the connection method between the rectifier control module and the power supply is switched from the original three-phase power supply connection method to a single-phase power supply connection method to achieve a reduction in the power supply input voltage.

[0063] When the rectifier control module operates in the step-down mode, the power source is the single-phase power source or the three-phase power source without a neutral line, and the maximum voltage is greater than the overvoltage threshold, the rectifier control module is controlled to disconnect the electrical connection with the power source, or the duty cycle of the switch tube is adjusted so that the adjusted maximum voltage is not greater than the overvoltage threshold;

[0064] When the above-mentioned rectifier control module operates in the above-mentioned step-down mode, the above-mentioned power supply type is the above-mentioned three-phase power supply with a neutral line, and the above-mentioned maximum voltage is greater than the above-mentioned overvoltage threshold, the above-mentioned rectifier control module is controlled to be electrically connected to the above-mentioned power supply using the above-mentioned single-phase power supply connection method, or the duty cycle of the above-mentioned switching tube is adjusted so that the adjusted above-mentioned maximum voltage is not greater than the above-mentioned overvoltage threshold.

[0065] In the above embodiment, when the power supply has an undervoltage abnormality or an overvoltage abnormality, different rectifier control module control modes are set according to different operating modes of the rectifier control module, different types of power supplies and different maximum voltage values, thereby further ensuring that the voltage delivered to the load is relatively stable, thereby further ensuring the normal operation of the load.

[0066] Those skilled in the art can flexibly set the specific circuit structure of the above-mentioned rectification control module according to actual needs, as long as its circuit structure can achieve the above-mentioned functions.

[0067] In another exemplary embodiment, the present application provides a specific circuit structure diagram of a rectifier control module, such as Figure 2As shown, the rectifier control module 12 includes: a first switch tube 16, a second switch tube 17, a third switch tube 18, a fourth switch tube 19, a fifth switch tube 20 and a sixth switch tube 21. The control ends of the first switch tube 16, the second switch tube 17, the third switch tube 18, the fourth switch tube 19, the fifth switch tube 20 and the sixth switch tube 21 are respectively electrically connected to the main control module 15. The first ends of the first switch tube 16, the third switch tube 18 and the fifth switch tube 20 are electrically connected. The second end of the first switch tube 16 is electrically connected to the first end of the second switch tube 17. The second end of the second switch tube 17 is used to be electrically connected to the negative electrode of the load 13. The second end of the third switch tube 18 is electrically connected to the first end of the fourth switch tube 19, and the second end of the fourth switch tube 19 is used to be electrically connected to the negative electrode of the load 13. The second end of the fifth switch tube 20 is electrically connected to the first end of the sixth switch tube 21, and the second end of the sixth switch tube 21 is used to be electrically connected to the negative electrode of the load 13; a first single-pole double-throw switch 22, the moving end control end of the first single-pole double-throw switch 22 is electrically connected to the main control module 15, the first fixed end of the first single-pole double-throw switch 22 is used to be electrically connected to the positive electrode of the load 13, the second fixed end of the first single-pole double-throw switch 22 is suspended, and the moving end of the first single-pole double-throw switch 22 is connected to the first fixed end of the first switch tube 16. a first inductor 25, a first end of the first inductor 25 being electrically connected to the first terminal of the first inductor 22, a second end of the second inductor 25 being electrically connected to the first terminal of the first inductor 22, a second end of the second inductor 25 being electrically connected to the first terminal of the first inductor 22, a third inductor 25 being electrically connected to the first terminal of the first inductor 22, a first end of the second inductor 25 being electrically connected to the first terminal of the first inductor 22, a second end of the second inductor 25 being electrically connected to the first terminal of the first inductor 22, a first end of the first ... second end of the second inductor 25 being electrically connected to the first terminal of the first inductor 22, a first end of the first inductor 25 being electrically connected to the first terminal of the first inductor 22, a second end of the second inductor 25 being electrically connected to the first terminal of the first inductor 22, a second end of the second inductor 25 being The moving end of the single-pole double-throw switch 23 is electrically connected, and the second end of the first inductor 25 is electrically connected to the second end of the first switch tube 16; the second inductor 26, the first end of the second inductor 26 is used to be electrically connected to the S end, and the second end of the second inductor 26 is electrically connected to the second end of the third switch tube 18; the third inductor 27, the first end of the third inductor 27 is electrically connected to the moving end of the third single-pole double-throw switch 24, and the second end of the third inductor 27 is electrically connected to the second end of the fifth switch tube 20; the first diode 28, the cathode of the first diode 28 is electrically connected to the first end of the first switch tube 16, and the anode of the first diode 28 is electrically connected to the second end of the first switch tube 16;A second diode 29, wherein the cathode of the second diode 29 is electrically connected to the first end of the second switch tube 17, and the anode of the second diode 29 is electrically connected to the second end of the second switch tube 17; a third diode 30, wherein the cathode of the third diode 30 is electrically connected to the first end of the third switch tube 18, and the anode of the third diode 30 is electrically connected to the second end of the third switch tube 18; a fourth diode 31, wherein the cathode of the fourth diode 31 is electrically connected to the first end of the fourth switch tube 19, and the anode of the fourth diode 31 is electrically connected to the second end of the fourth switch tube 19; a fifth diode 32, wherein the cathode of the fifth diode 32 is electrically connected to the first end of the fifth switch tube 20, and the anode of the fifth diode 32 is electrically connected to the second end of the fifth switch tube 20; a sixth diode 33, wherein the cathode of the sixth diode 33 is electrically connected to the first end of the sixth switch tube 21, and the anode of the sixth diode 33 is electrically connected to the second end of the sixth switch tube 21. ;

[0068] In the above embodiment, the rectifier control module includes three single-pole double-throw switches, three inductors, six switching tubes and six diodes. The three single-pole double-throw switches and the six switching tubes are controlled by the switch control signal of the main control module, so that the rectifier control module can realize the switching of different power supply connection methods and different working modes. Under the control of the main control module, the rectifier control module can adapt to power supplies of different specifications and loads with different requirements, thereby further solving the technical problem in the prior art that the power conversion equipment is not compatible with power inputs of different specifications and cannot meet the requirements of different loads, resulting in poor power adaptability of the power conversion equipment.

[0069] In the present application, adjusting the duty cycle of the switch tubes in the above-mentioned rectifier control module specifically adjusts the duty cycles of the first switch tube, the second switch tube, the third switch tube, the fourth switch tube, the fifth switch tube and the sixth switch tube.

[0070] The relationship between the output voltage Vo and the input voltage Vin of the rectifier control module in the buck mode is shown in formula (1):

[0071]

[0072] The relationship between the output voltage Vo and the input voltage Vin of the rectifier control module in the bridgeless boost PFC mode is shown in formula (2):

[0073]

[0074] Among them, t ON Refers to the conduction time of the switch tube, t OFFis the off time of the switch tube. D is the duty cycle. Therefore, from formula (1) and formula (2), it can be seen that the larger the duty cycle, the larger the output voltage of the rectifier control module. By adjusting the duty cycle of the switch tube, the output voltage can be adjusted. When overvoltage occurs, the duty cycle is reduced; when undervoltage occurs, the duty cycle is increased.

[0075] Specifically, Figure 2 As shown, in addition to the above structure, the rectifier control module further includes: an auxiliary capacitor 34, a first end of the auxiliary capacitor is electrically connected to the cathode of the fifth diode 32, and a second end of the auxiliary capacitor 34 is electrically connected to the anode of the sixth diode 33. The auxiliary capacitor plays the role of energy storage, can stabilize the DC voltage output, reduce voltage ripples, and further ensure that the signal quality of the DC signal output to the load by the rectifier control module is good.

[0076] Among them, the above three single-pole double-throw switches can be single-pole double-throw relays, or other power switching devices. The above six switch tubes include but are not limited to three-terminal transistors such as triodes, MOS tubes, and thyristors. The specific working parameters of the above three inductors, auxiliary capacitors, six diodes, six switch tubes, and three single-pole double-throw switches can be selected according to power requirements.

[0077] Based on the above-mentioned rectifier control module structure, the above-mentioned rectifier control module is also used to: control the moving end of the above-mentioned first single-pole double-throw switch to be electrically connected to the first fixed end of the above-mentioned first single-pole double-throw switch, the moving end of the above-mentioned second single-pole double-throw switch to be electrically connected to the second fixed end of the above-mentioned second single-pole double-throw switch, and the moving end of the above-mentioned third single-pole double-throw switch to be electrically connected to the second fixed end of the above-mentioned third single-pole double-throw switch, and control the above-mentioned first switch tube, the above-mentioned second switch tube, the above-mentioned third switch tube, the above-mentioned fourth switch tube, the above-mentioned fifth switch tube and the above-mentioned sixth switch tube to be turned off, so that the above-mentioned rectifier control module adopts the above-mentioned single-phase power supply connection method to be electrically connected to the above-mentioned power supply and operates in the above-mentioned full-wave rectification mode; control the moving end of the above-mentioned first single-pole double-throw switch to be electrically connected to the first fixed end of the above-mentioned first single-pole double-throw switch, the moving end of the above-mentioned second single-pole double-throw switch to be electrically connected to the second fixed end of the above-mentioned second single-pole double-throw switch, the moving end of the above-mentioned third single-pole double-throw switch to be electrically connected to the The second fixed end is electrically connected to control the first switch tube, the second switch tube, the third switch tube and the fifth switch tube to be turned off, and the switch states of the fourth switch tube and the sixth switch tube are controlled, so that the above-mentioned rectification control module adopts the above-mentioned single-phase power supply connection method to be electrically connected to the above-mentioned power supply and operates in the above-mentioned bridgeless boost PFC mode; the moving end of the above-mentioned first single-pole double-throw switch is controlled to be electrically connected to the second fixed end of the above-mentioned first single-pole double-throw switch, the moving end of the above-mentioned second single-pole double-throw switch is controlled to be electrically connected to the first fixed end of the above-mentioned second single-pole double-throw switch, and the moving end of the above-mentioned third single-pole double-throw switch is controlled to be electrically connected to the second fixed end of the above-mentioned third single-pole double-throw switch, the above-mentioned second switch tube, the above-mentioned third switch tube, the above-mentioned fourth switch tube, the above-mentioned fifth switch tube and the sixth switch tube are controlled to be turned off, and the switch state of the above-mentioned first switch tube is controlled, so that the above-mentioned rectification control module adopts the above-mentioned single-phase power supply connection method to be electrically connected to the above-mentioned power supply and operates in the above-mentioned step-down mode.

[0078] In the above embodiment, when the power supply connected to the rectifier control module is a single-phase power supply, the main control module controls the connection of three single-pole double-throw switches and the switching of six switching tubes, thereby achieving precise control of the various output voltages of the rectifier control module, further ensuring that the output voltage can meet the load requirements, thereby further improving the load demand adaptability of the power conversion equipment.

[0079] Specifically, through the above control, when the above rectification control module is electrically connected to the above power supply in the above single-phase power supply connection mode and operates in the above full-wave rectification mode, the corresponding equivalent circuit diagram of the above rectification control module is as follows: Figure 3 As shown by Figure 3It can be seen that the above-mentioned rectification control module is equivalent to a full-wave rectification circuit composed of the third diode 30, the fourth diode 31, the fifth diode 32, the sixth diode 33, the second inductor 26, the third inductor 27 and the auxiliary capacitor 34. When the above-mentioned single-phase power supply is a single-phase 220V, a 310V DC voltage output can be achieved through this circuit. When the above-mentioned rectification control module is electrically connected to the above-mentioned power supply using the above-mentioned single-phase power supply connection method and operates in the above-mentioned bridgeless boost PFC mode, the corresponding equivalent circuit diagram of the above-mentioned rectification control module is as follows Figure 4 As shown by Figure 4 It can be seen that the above-mentioned rectifier control module is equivalent to a bridgeless boost PFC circuit composed of a third diode 30, a fourth diode 31, a fifth diode 32, a sixth diode 33, a second inductor 26, a third inductor 27, an auxiliary capacitor 34, a fourth switch tube 19 and a sixth switch tube 21. By controlling the opening and closing of the fourth switch tube 19 and the sixth switch tube 21 by the main control module, the function of a basic bridgeless boost PFC circuit can be realized. The basic bridgeless boost PFC circuit has a power factor correction function, and performs a boost control on the input voltage of the power supply so that the voltage obtained by full-wave rectification can be increased to the DC voltage output required by the load. When the above-mentioned rectifier control module is electrically connected to the above-mentioned power supply using the above-mentioned single-phase power supply connection method and operates in the above-mentioned step-down mode, the corresponding equivalent circuit diagram of the above-mentioned rectifier control module is as follows: Figure 5 As shown by Figure 5 It can be seen that the above-mentioned rectifier control module is equivalent to a step-down circuit composed of a second diode 29, a third diode 30, a fourth diode 31, a fifth diode 32, a sixth diode 33, a first inductor 25, a second inductor 26, a third inductor 27, an auxiliary capacitor 34 and a first switch tube 16. By controlling the opening and closing of the first switch tube 16 through the main control module, the function of the step-down circuit can be realized, and the input voltage of the power supply can be stepped down so that the voltage output by full-wave rectification can be reduced to the DC voltage output required by the load.

[0080] Among them, the full-wave rectifier circuit, the bridgeless boost PFC circuit, and the second inductor and the third inductor connected in series in the buck circuit can improve the power factor and improve the efficiency of the power conversion equipment.

[0081] It should be noted that the main control module sends a first switch signal to the moving end control end of the first single-pole double-throw switch, so that the moving end of the first single-pole double-throw switch is electrically connected to the first fixed end of the first single-pole double-throw switch, and the main control module sends a second switch signal to the moving end control end of the first single-pole double-throw switch, so that the moving end of the first single-pole double-throw switch is electrically connected to the second fixed end of the first single-pole double-throw switch. The control principle of the second single-pole double-throw switch and the third single-pole double-throw switch is the same as that of the first single-pole double-throw switch, which will not be repeated here.

[0082] The main control module sends a closing signal to the control end of the first switch tube to close the first switch tube, and sends a shutoff signal to the control end of the first switch tube to shut off the first switch tube. The control principle of the second to sixth switch tubes is the same as that of the first switch tube, and will not be repeated here.

[0083] Based on the above-mentioned rectifier control module structure, the above-mentioned rectifier control module is also used to: control the moving end of the above-mentioned first single-pole double-throw switch to be electrically connected to the first fixed end of the above-mentioned first single-pole double-throw switch, the moving end of the above-mentioned second single-pole double-throw switch to be electrically connected to the second fixed end of the above-mentioned second single-pole double-throw switch, and the moving end of the above-mentioned third single-pole double-throw switch to be electrically connected to the first fixed end of the above-mentioned third single-pole double-throw switch, and control the above-mentioned first switch tube, the above-mentioned second switch tube, the above-mentioned third switch tube, the above-mentioned fourth switch tube, the above-mentioned fifth switch tube and the above-mentioned sixth switch tube to be turned off, so that the above-mentioned rectifier control module adopts the above-mentioned three-phase power supply connection method to be electrically connected to the above-mentioned power supply and operates in the above-mentioned full-wave rectification mode; control the moving end of the above-mentioned first single-pole double-throw switch to be electrically connected to the first fixed end of the above-mentioned first single-pole double-throw switch, the moving end of the above-mentioned second single-pole double-throw switch to be electrically connected to the second fixed end of the above-mentioned second single-pole double-throw switch, the moving end of the above-mentioned third single-pole double-throw switch to be electrically connected to the first fixed end of the above-mentioned third single-pole double-throw switch The first fixed end of the switch is electrically connected to the first fixed end of the switch, and the switching states of the first switch tube, the second switch tube, the third switch tube, the fourth switch tube, the fifth switch tube and the sixth switch tube are controlled, so that the above-mentioned rectification control module is electrically connected to the above-mentioned power supply in the above-mentioned three-phase power supply connection mode and operates in the above-mentioned bridgeless boost PFC mode; the moving end of the above-mentioned first single-pole double-throw switch is controlled to be electrically connected to the second fixed end of the above-mentioned first single-pole double-throw switch, the moving end of the above-mentioned second single-pole double-throw switch is electrically connected to the first fixed end of the above-mentioned second single-pole double-throw switch, and the moving end of the above-mentioned third single-pole double-throw switch is electrically connected to the second fixed end of the above-mentioned third single-pole double-throw switch, the second switch tube, the third switch tube, the fourth switch tube, the fifth switch tube and the sixth switch tube are controlled to be turned off, and the switching state of the above-mentioned first switch tube is controlled, so that the above-mentioned rectification control module is electrically connected to the above-mentioned power supply in the above-mentioned three-phase power supply connection mode and operates in the above-mentioned step-down mode.

[0084] In the above embodiment, when the power supply connected to the rectifier control module is a three-phase power supply, the main control module controls the connection of three single-pole double-throw switches and the switching of six switching tubes, thereby achieving precise control of the various output voltages of the rectifier control module, further ensuring that the output voltage can meet the load requirements, thereby further improving the load demand adaptability of the power conversion equipment.

[0085] Specifically, through the above control, when the above rectification control module is electrically connected to the above power supply using the above three-phase power connection mode and operates in the above full-wave rectification mode, the corresponding equivalent circuit diagram of the above rectification control module is as follows: Figure 6 As shown by Figure 6It can be seen that the above-mentioned rectifier control module is equivalent to a full-wave rectifier circuit composed of three inductors, six diodes and an auxiliary capacitor 34. When the above-mentioned three-phase power supply is three-phase 380V, a 540V DC voltage output can be achieved through this circuit. When the above-mentioned rectifier control module is electrically connected to the above-mentioned power supply using the above-mentioned three-phase power supply connection method and operates in the above-mentioned bridgeless boost PFC mode, the corresponding equivalent circuit diagram of the above-mentioned rectifier control module is as follows Figure 7 As shown by Figure 7 It can be seen that the above-mentioned rectifier control module is equivalent to a bridgeless boost PFC circuit composed of three inductors, six diodes, six transistors and an auxiliary capacitor 34. The main control module controls the opening and closing of the first switch tube 16, the second switch tube 17, the third switch tube 18, the fourth switch tube 19, the fifth switch tube 20 and the sixth switch tube 21, so as to realize the function of a three-phase voltage source type PWM rectifier circuit. The three-phase voltage source type PWM rectifier circuit has a power factor correction function, and performs a boost control on the input voltage of the power supply so that the voltage obtained by full-wave rectification can be increased to the DC voltage output required by the load. When the above-mentioned rectifier control module is electrically connected to the above-mentioned power supply using the above-mentioned three-phase power supply connection method and operates in the above-mentioned step-down mode, the corresponding equivalent circuit diagram of the above-mentioned rectifier control module is as follows: Figure 5 As shown by Figure 5 It can be seen that the above-mentioned rectifier control module is equivalent to a step-down circuit composed of a second diode 29, a third diode 30, a fourth diode 31, a fifth diode 32, a sixth diode 33, a first inductor 25, a second inductor 26, a third inductor 27, an auxiliary capacitor 34 and a first switch tube 16. By controlling the opening and closing of the first switch tube 16 through the main control module, the function of the step-down circuit can be realized, and the input voltage of the power supply can be stepped down so that the voltage output by full-wave rectification can be reduced to the DC voltage output required by the load.

[0086] Among them, the first inductor, the second inductor and the third inductor connected in series in the full-wave rectifier circuit, the bridgeless boost PFC circuit and the buck circuit can improve the power factor and improve the efficiency of the power conversion equipment.

[0087] The main control module is used to control the rectifier control module to disconnect the electrical connection with the power supply when the power supply type is the single-phase power supply, including: the main control module is used to control the moving end of the third single-pole double-throw switch to be electrically connected with the first fixed end of the third single-pole double-throw switch when the power supply type is the single-phase power supply, so that the rectifier control module disconnects the electrical connection with the power supply.

[0088] The main control module is used to switch the working mode to the step-down mode or control the rectifier control module to disconnect the electrical connection with the power supply when the rectifier control module operates in the full-wave rectifier mode, the power supply type is the three-phase power supply without neutral line, and the maximum voltage is greater than the overvoltage threshold, including: the main control module is used to perform one of the following when the rectifier control module operates in the full-wave rectifier mode, the power supply type is the three-phase power supply without neutral line, and the maximum voltage is greater than the overvoltage threshold: control the moving end of the first single-pole double-throw switch to be electrically connected to the second fixed end of the first single-pole double-throw switch, Control the moving end of the above-mentioned second single-pole double-throw switch to be electrically connected to the first fixed end of the above-mentioned second single-pole double-throw switch, and control the moving end of the above-mentioned third single-pole double-throw switch to be electrically connected to the second fixed end of the above-mentioned third single-pole double-throw switch, so that the above-mentioned rectifier control module is disconnected from the electrical connection with the above-mentioned power supply; control the moving end of the above-mentioned first single-pole double-throw switch to be electrically connected to the second fixed end of the above-mentioned first single-pole double-throw switch, control the moving end of the above-mentioned second single-pole double-throw switch to be electrically connected to the first fixed end of the above-mentioned second single-pole double-throw switch, and control the moving end of the above-mentioned third single-pole double-throw switch to be electrically connected to the first fixed end of the above-mentioned third single-pole double-throw switch, so as to switch the above-mentioned working mode to the above-mentioned step-down mode.

[0089] The above-mentioned main control module is used to control the above-mentioned rectifier control module to disconnect the electrical connection with the above-mentioned power supply when the above-mentioned rectifier control module operates in the above-mentioned step-down mode, the above-mentioned power supply type is the above-mentioned three-phase power supply without neutral line, and the above-mentioned voltage maximum value is greater than the above-mentioned overvoltage threshold, including: the above-mentioned main control module is used to control the moving end of the above-mentioned second single-pole double-throw switch to be electrically connected to the first fixed end of the above-mentioned second single-pole double-throw switch, and control the moving end of the above-mentioned third single-pole double-throw switch to be electrically connected to the second fixed end of the above-mentioned third single-pole double-throw switch, so that the above-mentioned rectifier control module is disconnected from the above-mentioned power supply.

[0090] For a 380V three-phase power supply with a neutral line, the effective value of the voltage between the live wire and the neutral wire is 220V, which is the same as the effective value of a 220V single-phase power supply. Therefore, for a 380V three-phase power supply with a neutral line, only one phase is connected, which is equivalent to inserting a single-phase power supply.

[0091] When the power supply is a three-phase power supply and there is a neutral line on the power socket (that is, the power supply is a three-phase power supply with a neutral line), the three live wires are connected to the R, S, and T terminals respectively, and the neutral line is connected to the N terminal. The above-mentioned main control module is used to control the above-mentioned rectification control module to be electrically connected to the above-mentioned power supply using the above-mentioned single-phase power connection mode when the above-mentioned rectification control module operates in the above-mentioned full-wave rectification mode, the above-mentioned power supply type is the above-mentioned three-phase power supply with a neutral line, and the above-mentioned maximum voltage is greater than the above-mentioned overvoltage threshold, including: the above-mentioned main control module is used to control the moving end of the above-mentioned second single-pole double-throw switch to be electrically connected to the first fixed end of the above-mentioned second single-pole double-throw switch, and control the moving end of the above-mentioned third single-pole double-throw switch to be electrically connected to the second fixed end of the above-mentioned third single-pole double-throw switch when the above-mentioned rectification control module operates in the above-mentioned full-wave rectification mode, the above-mentioned power supply type is the above-mentioned three-phase power supply with a neutral line, and the above-mentioned maximum voltage is greater than the above-mentioned overvoltage threshold. The above-mentioned main control module is used to control the above-mentioned rectification control module to be electrically connected to the above-mentioned power supply using the above-mentioned single-phase power supply connection method when the above-mentioned rectification control module operates in the above-mentioned step-down mode, the above-mentioned power supply type is the above-mentioned three-phase power supply with a neutral line, and the above-mentioned maximum voltage is greater than the above-mentioned overvoltage threshold, including: the above-mentioned active module is used to control the moving end of the above-mentioned second single-pole double-throw switch to be electrically connected to the first fixed end of the above-mentioned second single-pole double-throw switch, and control the moving end of the above-mentioned third single-pole double-throw switch to be electrically connected to the second fixed end of the above-mentioned third single-pole double-throw switch when the above-mentioned rectification control module operates in the above-mentioned step-down mode, the above-mentioned power supply type is the above-mentioned three-phase power supply with a neutral line, and the above-mentioned maximum voltage is greater than the above-mentioned overvoltage threshold.

[0092] According to other optional schemes of the present application, Figure 8As shown, the input detection module includes: a first resistor 35, a first end of the first resistor 35 is used to be electrically connected to the R end; a second resistor 36, a first end of the second resistor 36 is used to be electrically connected to the S end, and the resistance of the first resistor 35 is the same as the resistance of the second resistor 36; a first operational amplifier 37, a first input end of the first operational amplifier 37 is electrically connected to the second end of the first resistor 35, and a second input end of the first operational amplifier 37 is electrically connected to the second end of the second resistor 36; a third resistor 38, a first end of the third resistor 38 is electrically connected to the output end of the first operational amplifier 37, and a second end of the third resistor 38 is electrically connected to the main control module 15; a fourth Resistor 39, the first end of the fourth resistor 39 is electrically connected to the second input end of the first operational amplifier 37; the fifth resistor 40, the first end of the fifth resistor 40 is used to be electrically connected to the T end, and the resistance of the fourth resistor 39 is the same as the resistance of the fifth resistor 40; the second operational amplifier 41, the first input end of the second operational amplifier 41 is electrically connected to the second end of the fourth resistor 39, and the second input end of the second operational amplifier 41 is electrically connected to the second end of the fifth resistor 40; the sixth resistor 42, the first end of the sixth resistor 42 is electrically connected to the output end of the second operational amplifier 41, and the second end of the sixth resistor 42 is electrically connected to the main control module 15; the seventh resistor 43, The first end of the seventh resistor 43 is electrically connected to the second input end of the second operational amplifier 41; the eighth resistor 44, the first end of the eighth resistor 44 is electrically connected to the first input end of the first operational amplifier 37, and the resistance value of the seventh resistor 43 is the same as the resistance value of the eighth resistor 44; the third operational amplifier 45, the first input end of the third operational amplifier 45 is electrically connected to the second end of the seventh resistor 43, and the second input end of the third operational amplifier 45 is electrically connected to the second end of the eighth resistor 44; the ninth resistor 46, the first end of the ninth resistor 46 is electrically connected to the output end of the third operational amplifier 45, and the second end of the ninth resistor 46 is electrically connected to the main control module 15; A tenth resistor 47, a first end of the tenth resistor 47 is electrically connected to the second input end of the first operational amplifier 37; an eleventh resistor 48, a first end of the eleventh resistor 48 is used to be electrically connected to the N end, and the resistance value of the tenth resistor 47 is the same as the resistance value of the eleventh resistor 48; a fourth operational amplifier 49, a first input end of the fourth operational amplifier 49 is electrically connected to the second end of the tenth resistor 47, and a second input end of the fourth operational amplifier 49 is electrically connected to the second end of the eleventh resistor 48; a twelfth resistor 50, a first end of the twelfth resistor 50 is electrically connected to the output end of the third operational amplifier 45, and a second end of the twelfth resistor 50 is electrically connected to the main control module 15.

[0093] In the input detection module of the above embodiment, after the differential input resistor voltage is divided, it is adjusted to the level range required by the main control module through the operational amplifier, so that the main control module determines the RS terminal voltage difference, ST terminal voltage difference, TR terminal voltage difference and SN terminal voltage difference of the power supply according to the received level, further ensuring the high accuracy of the voltage difference detection, and at the same time facilitating the subsequent main control module to accurately determine the power type of the power supply according to these voltage differences.

[0094] Specifically, taking the RS end as an example, the first resistor and the second resistor are used to divide the voltage of the R end and the S end of the differential input, and the first operational amplifier is used to calculate the voltage difference of the RS end, and cooperate with the third resistor to adjust the voltage difference to the level range required by the main control module to obtain the RS end difference signal. The functions of the resistors and operational amplifiers at other ends are the same as those at the RS end, and will not be repeated here. The above-mentioned main control module includes an analog-to-digital converter, which receives the RS end difference signal through the third resistor and converts it through the analog-to-digital converter, and then obtains the actual voltage difference of the RS end after calculation.

[0095] The first resistor to the twelfth resistor may all be a single group, or may be a resistor structure composed of a plurality of resistors connected in series and parallel. Specifically, the number and specific connection relationship of the resistors may be set according to the required resistance value. Figure 8 An embodiment in which the first resistor 35, the second resistor 36, the fourth resistor 39, the fifth resistor 40, the seventh resistor 43, the eighth resistor 44, the tenth resistor 47 and the eleventh resistor 48 are all composed of two resistors connected in series is given by way of example, and this embodiment does not constitute a limitation to the present application.

[0096] Optionally, the main control module is further used to receive the voltage difference between the R terminal and the S terminal through the third resistor, receive the voltage difference between the S terminal and the T terminal through the sixth resistor, receive the voltage difference between the T terminal and the R terminal through the ninth resistor, and receive the voltage difference between the S terminal and the N terminal through the twelfth resistor. The main control module is used to determine the specification information of the power supply according to the voltage difference, including: the main control module is used to determine the specification information of the power supply when the voltage difference between the R terminal and the S terminal, the voltage difference between the S terminal and the T terminal, and the voltage difference between the T terminal and the R terminal are zero, and the voltage between the S terminal and the N terminal is The above main control module is used to determine that the power type of the above power supply is a three-phase power supply without a neutral line when the voltage difference between the above R terminal and the above S terminal, the voltage difference between the above S terminal and the above T terminal, and the voltage difference between the above T terminal and the above R terminal are not zero, and the voltage difference between the above S terminal and the above N terminal is zero; the above main control module is used to determine that the power type of the above power supply is a three-phase power supply with a neutral line when the voltage difference between the above R terminal and the above S terminal, the voltage difference between the above S terminal and the above T terminal, the voltage difference between the above T terminal and the above R terminal, and the voltage difference between the above S terminal and the above N terminal are all not zero. The main control module of the above power conversion device realizes the effect of automatically identifying the power type by judging the voltage difference, and subsequently controls the rectifier control module to adopt the connection method of the corresponding power type to electrically connect with the power supply according to the identified power type, thereby further improving the adaptability of the power conversion device.

[0097] Specifically, when the voltage difference VRS at the RS terminal, the voltage difference VST at the ST terminal, and the voltage difference VTR at the TR terminal are all zero, but the voltage difference VSN at the SN terminal is not zero, it indicates that the connection is single-phase power; when the maximum voltage VSN(max) of VSN is detected, VSN(max) is divided by The effective value of the input power voltage can be obtained, so as to determine the phase voltage of the AC power supply. When it is detected that VRS, VST, and VTR are not zero, and VSN is zero, it means that the three-phase power is connected and there is no neutral line. Detect the maximum voltage VRS (max) of VRS, and divide VRS (max) by Get the effective value of the input power voltage to determine the line voltage of the AC power. When it is detected that VRS, VST, VTR, and VSN are not zero, it means that the three-phase power is connected and there is a neutral line. Similarly, detect the maximum voltage VRS (max) of VRS, and divide VRS (max) by Get the effective value of the input power voltage to determine how many volts the AC power line voltage is.

[0098] In other embodiments of the present application, Fig. 9As shown, the power conversion device 100 further includes: an output detection module 51, the input end of the output detection module 51 is used to be electrically connected to the load 13, the output end of the output detection module 51 is electrically connected to the main control module 15, and the output detection module 51 is used to detect the actual voltage of the load 13; a main capacitor 52 is connected in parallel across the positive electrode DC+ of the load 13 and the negative electrode DC- of the load 13; the main control module 15 is also used to adjust the working mode of the rectifier control module 12 when the absolute value of the difference between the actual voltage and the required voltage is greater than a predetermined threshold value, so that the absolute value of the difference after adjustment is not greater than the predetermined threshold value. In this embodiment, the actual voltage at both ends of the load is detected by the output detection module. The actual voltage is the actual voltage value provided to the load after rectification and regulation by the rectification control module. The main control module can adjust the working mode of the above-mentioned rectification control module according to the deviation between the actual voltage and the required voltage, thereby realizing closed-loop regulation of the rectification control module, further ensuring that the actual voltage output to the load is closely matched with the required voltage of the load, and further ensuring that the output voltage of the power conversion device is highly accurate; in addition, by arranging main capacitors at the positive and negative ends of the load, it can play an energy storage role, stabilize the DC power supply, and reduce voltage ripple, thereby further ensuring that the voltage signal output to the load is relatively stable and of good quality.

[0099] It should be noted that the principle that the main control module can adjust the working mode of the rectifier control module according to the deviation between the actual voltage and the required voltage is the same as the principle that the main control module adjusts the working mode of the rectifier control module according to the maximum voltage of the power supply, and will not be repeated here.

[0100] Furthermore, the specific circuit structures of the load feedback module and the output detection module can be any feasible circuit structures that can realize the functions of the load feedback module and the output detection module, and those skilled in the art can flexibly set the specific circuit structures of the load feedback module and the output detection module according to actual needs. The main control module can specifically be a processor, a single-chip microcomputer, etc.

[0101] The power conversion device provided in the present application is connected to the AC power input and realizes the DC power output through the rectifier control module. In the power conversion device, the input detection module identifies the specifications of the AC power supply and performs input power abnormality monitoring, and the detection signal is transmitted to the main control module. The output voltage detection module is used to detect the DC voltage and monitor the output abnormality at the same time. A conventional DC voltage detection scheme can be adopted, and the detection signal is transmitted to the main control module. The load feedback module is mainly used to receive the working status of the load, the voltage demand of the DC power supply and other information, which can be realized through a conventional serial communication interface or an industrial bus communication interface. The main capacitor plays the role of energy storage, and can stabilize the DC power supply and reduce the voltage ripple. The main control module performs calculation processing according to the detection signals of the input detection module, the output detection module and the information of the load feedback, and controls the rectifier control module to switch the working mode. The power conversion device of the present application is compatible with power inputs of various specifications, realizes a stable and controllable DC voltage output, and can match the needs of different loads.

[0102] An embodiment of the present application further provides a servo driver, the servo driver comprising:

[0103] Any of the above power conversion devices;

[0104] An inverter device, electrically connected to the output end of the power conversion device, and the inverter device is used to convert direct current into alternating current required for the operation of the motor;

[0105] The motor is electrically connected to the output end of the inverter device.

[0106] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0107] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A power conversion device, characterized in that: The power conversion device comprises: An input detection module, wherein the input end of the input detection module is used to be electrically connected to the R end, the S end, the T end and the N end of the power supply, respectively, and the input detection module is used to collect voltage difference values, wherein the voltage difference values ​​include the voltage difference between the R end and the S end, the voltage difference between the S end and the T end, the voltage difference between the T end and the R end, and the voltage difference between the S end and the N end; A rectifier control module, wherein an input end of the rectifier control module is used to be electrically connected to the R end, the S end, the T end and the N end respectively, and an output end of the rectifier control module is used to be electrically connected to a load; A load feedback module, wherein the input end of the load feedback module is used to be electrically connected to the load, and the load feedback module is used to collect the required voltage of the load; A main control module is electrically connected to the output end of the input detection module, the control end of the rectification control module and the output end of the load feedback module, respectively. The main control module is used to determine the specification information of the power supply according to the voltage difference, and control the operation of the rectification control module according to the specification information and the required voltage, so as to rectify and regulate the alternating current of the power supply and output it to the load.

2. The power conversion device according to claim 1, characterized in that: The specification information includes a voltage effective value and a power type, the power type being a single-phase power supply, a three-phase power supply without a neutral line, or a three-phase power supply with a neutral line. The main control module is used to control the operation of the rectifier control module according to the specification information and the required voltage, including: The main control module is used to determine the working mode of the rectification control module as a full-wave rectification mode, a bridgeless boost PFC mode or a buck mode according to the magnitude relationship between the required voltage and the effective value of the voltage; The main control module is used to control the rectifier control module to be electrically connected to the power supply in a single-phase power supply connection mode when the power supply type is the single-phase power supply, and control the rectifier control module to operate in the working mode; The main control module is used to control the rectifier control module to be electrically connected to the power supply using a three-phase power supply connection method when the power supply type is the three-phase power supply without a neutral line or the three-phase power supply with a neutral line, and control the rectifier control module to operate in the working mode.

3. The power conversion device according to claim 2, characterized in that: The main control module is used to determine the working mode of the rectification control module as a full-wave rectification mode, a bridgeless boost PFC mode or a buck mode according to the magnitude relationship between the required voltage and the effective value of the voltage, including: The main control module is used for determining that the working mode is the full-wave rectification mode when the required voltage is equal to the effective value of the voltage; The main control module is used for determining that the working mode is the bridgeless boost PFC mode when the required voltage is greater than the voltage effective value; The main control module is used for determining that the working mode is the voltage reduction mode when the required voltage is less than the effective value of the voltage.

4. The power conversion device according to claim 2, characterized in that: The main control module is also used for: When the rectification control module operates in the full-wave rectification mode and the maximum voltage is less than the undervoltage threshold, the operation mode is switched to the bridgeless boost PFC mode, and the maximum voltage is the effective value of the voltage. times; When the rectifier control module operates in the bridgeless boost PFC mode and the maximum voltage is greater than the overvoltage threshold or less than the undervoltage threshold, adjust the duty cycle of the switch tube in the rectifier control module so that the adjusted maximum voltage is not greater than the overvoltage threshold and not less than the undervoltage threshold; When the rectifier control module operates in the buck mode and the maximum voltage is less than the undervoltage threshold, the operating mode is switched to the full-wave rectification mode or the bridgeless boost PFC mode; When the rectification control module operates in the full-wave rectification mode, the power source type is the single-phase power source or the three-phase power source without a neutral line, and the maximum voltage is greater than the overvoltage threshold, the operation mode is switched to the step-down mode or the rectification control module is controlled to disconnect the electrical connection with the power source; When the rectification control module operates in the full-wave rectification mode, the power type is the three-phase power supply with a neutral line, and the maximum voltage is greater than the overvoltage threshold, the rectification control module is controlled to be electrically connected to the power supply in the single-phase power connection mode; When the rectifier control module operates in the step-down mode, the power source type is the single-phase power source or the three-phase power source without a neutral line, and the maximum voltage is greater than the overvoltage threshold, the rectifier control module is controlled to disconnect the electrical connection with the power source, or the duty cycle of the switch tube is adjusted so that the adjusted maximum voltage is not greater than the overvoltage threshold; When the rectifier control module operates in the step-down mode, the power supply type is the three-phase power supply with a neutral line, and the maximum voltage is greater than the overvoltage threshold, the rectifier control module is controlled to be electrically connected to the power supply using the single-phase power supply connection method, or the duty cycle of the switching tube is adjusted so that the adjusted maximum voltage is not greater than the overvoltage threshold.

5. The power conversion device according to claim 3, characterized in that: The rectifier control module comprises: a first switch tube, a second switch tube, a third switch tube, a fourth switch tube, a fifth switch tube and a sixth switch tube, wherein control ends of the first switch tube, the second switch tube, the third switch tube, the fourth switch tube, the fifth switch tube and the sixth switch tube are electrically connected to the main control module respectively, a first end of the first switch tube, the third switch tube and the fifth switch tube are electrically connected, a second end of the first switch tube is electrically connected to a first end of the second switch tube, a second end of the second switch tube is used to be electrically connected to a negative electrode of the load, a second end of the third switch tube is electrically connected to a first end of the fourth switch tube, a second end of the fourth switch tube is used to be electrically connected to a negative electrode of the load, a second end of the fifth switch tube is electrically connected to a first end of the sixth switch tube, and a second end of the sixth switch tube is used to be electrically connected to a negative electrode of the load; a first single-pole double-throw switch, wherein a moving end control end of the first single-pole double-throw switch is electrically connected to the main control module, a first fixed end of the first single-pole double-throw switch is used to be electrically connected to the positive electrode of the load, a second fixed end of the first single-pole double-throw switch is suspended, and a moving end of the first single-pole double-throw switch is electrically connected to a first end of the first switch tube; a second single-pole double-throw switch, wherein a movable end control end of the second single-pole double-throw switch is electrically connected to the main control module, a first fixed end of the second single-pole double-throw switch is electrically connected to a first fixed end of the first single-pole double-throw switch, and a second fixed end of the second single-pole double-throw switch is used to be electrically connected to the R end; A third single-pole double-throw switch, wherein the movable end control end of the third single-pole double-throw switch is electrically connected to the main control module, the first fixed end of the third single-pole double-throw switch is used to be electrically connected to the T end, and the second fixed end of the third single-pole double-throw switch is used to be electrically connected to the N end; A first inductor, wherein a first end of the first inductor is electrically connected to a moving end of the second single-pole double-throw switch, and a second end of the first inductor is electrically connected to a second end of the first switch tube; a second inductor, wherein a first end of the second inductor is electrically connected to the S end, and a second end of the second inductor is electrically connected to a second end of the third switch tube; a third inductor, wherein a first end of the third inductor is electrically connected to a moving end of the third single-pole double-throw switch, and a second end of the third inductor is electrically connected to a second end of the fifth switch tube; a first diode, wherein a cathode of the first diode is electrically connected to a first end of the first switch tube, and an anode of the first diode is electrically connected to a second end of the first switch tube; a second diode, wherein a cathode of the second diode is electrically connected to a first end of the second switch tube, and an anode of the second diode is electrically connected to a second end of the second switch tube; a third diode, wherein a cathode of the third diode is electrically connected to a first end of the third switch tube, and an anode of the third diode is electrically connected to a second end of the third switch tube; a fourth diode, wherein a cathode of the fourth diode is electrically connected to the first end of the fourth switch tube, and an anode of the fourth diode is electrically connected to the second end of the fourth switch tube; a fifth diode, wherein a cathode of the fifth diode is electrically connected to the first end of the fifth switch tube, and an anode of the fifth diode is electrically connected to the second end of the fifth switch tube; A sixth diode, wherein a cathode of the sixth diode is electrically connected to the first end of the sixth switch tube, and an anode of the sixth diode is electrically connected to the second end of the sixth switch tube.

6. The power conversion device according to claim 5, characterized in that: The rectifier control module is also used for: Controlling the moving end of the first single-pole double-throw switch to be electrically connected to the first fixed end of the first single-pole double-throw switch, the moving end of the second single-pole double-throw switch to be electrically connected to the second fixed end of the second single-pole double-throw switch, and the moving end of the third single-pole double-throw switch to be electrically connected to the second fixed end of the third single-pole double-throw switch, and controlling the first switch tube, the second switch tube, the third switch tube, the fourth switch tube, the fifth switch tube, and the sixth switch tube to be turned off, so that the rectification control module is electrically connected to the power supply in the single-phase power supply connection mode and operates in the full-wave rectification mode; Controlling the moving end of the first single-pole double-throw switch to be electrically connected to the first fixed end of the first single-pole double-throw switch, controlling the moving end of the second single-pole double-throw switch to be electrically connected to the second fixed end of the second single-pole double-throw switch, and controlling the moving end of the third single-pole double-throw switch to be electrically connected to the second fixed end of the third single-pole double-throw switch, controlling the first switch tube, the second switch tube, the third switch tube, and the fifth switch tube to be turned off, and controlling the switching states of the fourth switch tube and the sixth switch tube, so that the rectifier control module adopts the single-phase power supply connection mode to be electrically connected to the power supply and operates in the bridgeless boost PFC mode; Control the moving end of the first single-pole double-throw switch to be electrically connected to the second fixed end of the first single-pole double-throw switch, control the moving end of the second single-pole double-throw switch to be electrically connected to the first fixed end of the second single-pole double-throw switch, and control the moving end of the third single-pole double-throw switch to be electrically connected to the second fixed end of the third single-pole double-throw switch; control the second switch tube, the third switch tube, the fourth switch tube, the fifth switch tube, and the sixth switch tube to be turned off, and control the switching state of the first switch tube, so that the rectifier control module adopts the single-phase power supply connection method to be electrically connected to the power supply and operates in the step-down mode.

7. The power conversion device according to claim 5, characterized in that: The rectifier control module is also used for: Controlling the moving end of the first single-pole double-throw switch to be electrically connected to the first fixed end of the first single-pole double-throw switch, controlling the moving end of the second single-pole double-throw switch to be electrically connected to the second fixed end of the second single-pole double-throw switch, and controlling the moving end of the third single-pole double-throw switch to be electrically connected to the first fixed end of the third single-pole double-throw switch, and controlling the first switch tube, the second switch tube, the third switch tube, the fourth switch tube, the fifth switch tube, and the sixth switch tube to be turned off, so that the rectification control module adopts the three-phase power supply connection mode to be electrically connected to the power supply and operates in the full-wave rectification mode; Controlling the moving end of the first single-pole double-throw switch to be electrically connected to the first fixed end of the first single-pole double-throw switch, controlling the moving end of the second single-pole double-throw switch to be electrically connected to the second fixed end of the second single-pole double-throw switch, and controlling the moving end of the third single-pole double-throw switch to be electrically connected to the first fixed end of the third single-pole double-throw switch, and controlling the switching states of the first switch tube, the second switch tube, the third switch tube, the fourth switch tube, the fifth switch tube, and the sixth switch tube, so that the rectifier control module adopts the three-phase power supply connection mode to be electrically connected to the power supply and operates in the bridgeless boost PFC mode; Control the moving end of the first single-pole double-throw switch to be electrically connected to the second fixed end of the first single-pole double-throw switch, control the moving end of the second single-pole double-throw switch to be electrically connected to the first fixed end of the second single-pole double-throw switch, and control the moving end of the third single-pole double-throw switch to be electrically connected to the second fixed end of the third single-pole double-throw switch; control the second switch tube, the third switch tube, the fourth switch tube, the fifth switch tube, and the sixth switch tube to be turned off, and control the switching state of the first switch tube, so that the rectifier control module adopts the three-phase power supply connection method to be electrically connected to the power supply and operates in the step-down mode.

8. The power conversion device according to any one of claims 1 to 7, characterized in that: The input detection module comprises: a first resistor, wherein a first end of the first resistor is electrically connected to the R end; a second resistor, wherein a first end of the second resistor is used to be electrically connected to the S end, and a resistance value of the first resistor is the same as a resistance value of the second resistor; a first operational amplifier, wherein a first input terminal of the first operational amplifier is electrically connected to a second terminal of the first resistor, and a second input terminal of the first operational amplifier is electrically connected to a second terminal of the second resistor; a third resistor, wherein a first end of the third resistor is electrically connected to the output end of the first operational amplifier, and a second end of the third resistor is electrically connected to the main control module; a fourth resistor, a first end of the fourth resistor being electrically connected to the second input end of the first operational amplifier; a fifth resistor, wherein a first end of the fifth resistor is used to be electrically connected to the T end, and a resistance value of the fourth resistor is the same as a resistance value of the fifth resistor; a second operational amplifier, wherein a first input terminal of the second operational amplifier is electrically connected to a second terminal of the fourth resistor, and a second input terminal of the second operational amplifier is electrically connected to a second terminal of the fifth resistor; a sixth resistor, wherein a first end of the sixth resistor is electrically connected to the output end of the second operational amplifier, and a second end of the sixth resistor is electrically connected to the main control module; a seventh resistor, a first end of the seventh resistor being electrically connected to the second input end of the second operational amplifier; an eighth resistor, a first end of the eighth resistor being electrically connected to the first input end of the first operational amplifier, and a resistance value of the seventh resistor being the same as a resistance value of the eighth resistor; a third operational amplifier, wherein a first input terminal of the third operational amplifier is electrically connected to the second terminal of the seventh resistor, and a second input terminal of the third operational amplifier is electrically connected to the second terminal of the eighth resistor; a ninth resistor, wherein a first end of the ninth resistor is electrically connected to the output end of the third operational amplifier, and a second end of the ninth resistor is electrically connected to the main control module; a tenth resistor, a first end of the tenth resistor being electrically connected to the second input end of the first operational amplifier; an eleventh resistor, wherein a first end of the eleventh resistor is used to be electrically connected to the N terminal, and a resistance value of the tenth resistor is the same as a resistance value of the eleventh resistor; a fourth operational amplifier, wherein a first input terminal of the fourth operational amplifier is electrically connected to the second end of the tenth resistor, and a second input terminal of the fourth operational amplifier is electrically connected to the second end of the eleventh resistor; A twelfth resistor, wherein a first end of the twelfth resistor is electrically connected to the output end of the third operational amplifier, and a second end of the twelfth resistor is electrically connected to the main control module.

9. The power conversion device according to claim 8, characterized in that: The main control module is further used to receive the voltage difference between the R terminal and the S terminal through the third resistor, receive the voltage difference between the S terminal and the T terminal through the sixth resistor, receive the voltage difference between the T terminal and the R terminal through the ninth resistor, and receive the voltage difference between the S terminal and the N terminal through the twelfth resistor. The main control module is used to determine the specification information of the power supply according to the voltage difference, including: The main control module is used to determine that the power type of the power supply is a single-phase power supply when the voltage difference between the R terminal and the S terminal, the voltage difference between the S terminal and the T terminal, and the voltage difference between the T terminal and the R terminal are zero, and the voltage difference between the S terminal and the N terminal is not zero; The main control module is used to determine that the power type is a three-phase power supply without a neutral line when the voltage difference between the R terminal and the S terminal, the voltage difference between the S terminal and the T terminal, and the voltage difference between the T terminal and the R terminal are not zero, and the voltage difference between the S terminal and the N terminal is zero; The main control module is used to determine that the power supply type is a three-phase power supply with a neutral line when the voltage difference between the R terminal and the S terminal, the voltage difference between the S terminal and the T terminal, the voltage difference between the T terminal and the R terminal, and the voltage difference between the S terminal and the N terminal are all not zero.

10. The power conversion device according to any one of claims 1 to 7, characterized in that: The power conversion device further includes: an output detection module, the input end of the output detection module is used to be electrically connected to the load, the output end of the output detection module is electrically connected to the main control module, and the output detection module is used to detect the actual voltage of the load; a main capacitor is connected in parallel to the positive electrode of the load and the negative electrode of the load; The main control module is also used to adjust the working mode of the rectifier control module when the absolute value of the difference between the actual voltage and the required voltage is greater than a predetermined threshold, so that the absolute value of the difference after adjustment is not greater than the predetermined threshold.

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