Apparatus for voltage converting apparatus and operating method thereof
Patent Information
- Authority / Receiving Office
- KR · KR
- Patent Type
- Patents
- Current Assignee / Owner
- TECH UNIV OF KOREA IND ACADEMIC COOP FOUNDATION
- Filing Date
- 2024-01-18
- Publication Date
- 2026-08-03
Smart Images
Figure 112024007055850-PAT00001_ABST
Abstract
Description
Technology Field
[0001] The present disclosure relates to a voltage converter and a method of operating the voltage converter. Background Technology
[0002] Three-phase voltage can be input to a power conversion circuit that includes an inverter for motor driving. The magnitude of the three-phase voltage may vary by country. For example, the three-phase voltage in Korea and Europe is an AC voltage with an RMS value of 380V, the three-phase voltage in North America is an AC voltage with an RMS value of 220V, and the three-phase voltage in Canada is an AC voltage with an RMS value of 480V. Depending on the input three-phase voltage by country, the voltage conversion circuit and motor configuration may differ. Products sold in Korea and Europe consist of voltage conversion circuits and motors based on an AC voltage with an RMS value of 380V, while products sold in North America and Canada consist of voltage conversion circuits and motors based on an AC voltage with an RMS value of 220V and an AC voltage with an RMS value of 480V, respectively. means of solving the problem
[0004] A voltage conversion device for converting the voltage level of an input voltage according to one embodiment may include a rectifier module that rectifies an AC input voltage and outputs the rectified input voltage, a converter power module disposed at the output terminal of the rectifier module and regulating the voltage level of the rectified input voltage, a reactor module connected to the input terminal of the converter power module, an inverter power module that outputs an AC voltage to a load based on the input voltage whose voltage level is regulated by the converter power module, and a capacitor module connected to the input terminals of the inverter power module.
[0005] The rectifier module includes a first terminal and a second terminal corresponding to the output terminals of the rectifier module, the reactor module includes a third terminal corresponding to the input terminal of the reactor module, the converter power module includes a fourth terminal, a fifth terminal and a sixth terminal, the inverter power module includes a seventh terminal and an eighth terminal corresponding to the input terminals of the inverter power module, the fourth terminal and the sixth terminal are connected to a common node, and the capacitor module can be connected to the seventh terminal and the eighth terminal.
[0006] The converter power module may include first switches connected to the fifth terminal of the converter power module and the output terminal of the reactor module, first freewheeling diodes connected in parallel to each of the first switches, second switches connected to the sixth terminal of the converter power module and the output terminal of the reactor module, and second freewheeling diodes connected in parallel to each of the second switches.
[0007] The voltage conversion device may be such that an AC voltage of an effective value of 380V (volt) is input to the rectifier module as the input voltage, the first terminal of the rectifier module is connected to the third terminal of the reactor module, the second terminal of the rectifier module is connected to the fourth terminal of the converter power module, the fifth terminal of the converter power module is connected to the seventh terminal of the inverter power module, and the sixth terminal of the converter power module is connected to the eighth terminal of the inverter power module.
[0008] The voltage conversion device may be such that, by turning off the first switches and the second switches, the output current of the reactor module is output through the first freewheeling diodes, and a DC voltage of 540V is output from the output terminals of the converter power module.
[0009] The voltage conversion device may be such that an AC voltage of an effective value of 220V (volt) is input to the rectifier module as the input voltage, the first terminal of the rectifier module is connected to the third terminal of the reactor module, the second terminal of the rectifier module is connected to the fourth terminal of the converter power module, the fifth terminal of the converter power module is connected to the seventh terminal of the inverter power module, and the sixth terminal of the converter power module is connected to the eighth terminal of the inverter power module.
[0010] The voltage conversion device may be such that the output current of the reactor module is output through the second switches by turning the first switches off and turning the second switches on, and the reactor module may store energy from the rectified voltage rectified by the rectification module, where the alternating voltage has an effective value of 220V (volt).
[0011] The voltage conversion device may be such that, by turning off the first switches and the second switches, the output current is output through the first freewheeling diodes by the reactor module, and a DC voltage of 540V (volt) is output from the output terminals of the converter power module, with the rectified voltage boosted.
[0012] The voltage conversion device may be such that an AC voltage of an effective value of 480V (volt) is input to the rectifier module as the input voltage, the first terminal of the rectifier module is connected to the fifth terminal of the converter power module, the second terminal of the rectifier module is connected to the sixth terminal of the converter power module, the third terminal of the reactor module is connected to the seventh terminal of the inverter power module, and the fourth terminal of the converter power module is connected to the eighth terminal of the inverter power module.
[0013] The voltage conversion device may be such that the output current of the first switches is output to the reactor module by turning the first switches on and turning the second switches off, and the reactor module may store energy from the rectified voltage rectified by the rectification module, which is an alternating voltage of an effective value of 480V (volt).
[0014] The voltage conversion device may output a DC voltage of 540V (volt) from the output terminals of the converter power module, wherein the rectified voltage is reduced by turning off the first switches and the second switches.
[0015] The voltage conversion device may determine the number of switches controlled among the first switches and the second switches according to a load rate determined based on the average load and maximum load of the load connected to the inverter power module.
[0016] A method of operation of a voltage conversion device according to one embodiment, comprising a rectifier module, a converter power module, a reactor module connected to an input terminal of the converter power module, an inverter power module, and a capacitor module connected to the input terminals of the inverter power module, may include: receiving an AC input voltage; controlling the connection relationship between the rectifier module, the reactor module, the converter power module, the capacitor module, and the inverter power module based on a voltage level of the input voltage; rectifying the AC input voltage through the rectifier module to output a rectified input voltage; adjusting the voltage level of the rectified input voltage through the converter power module; and outputting an AC voltage to a load based on the input voltage with the adjusted voltage level through the inverter power module. Brief explanation of the drawing
[0018] FIG. 1 is a drawing for explaining the components of a voltage conversion device according to one embodiment. FIG. 2 is a diagram illustrating a rectification mode that transmits a rectified voltage according to one embodiment. FIGS. 3a and FIGS. 3b are drawings for explaining the step-up of a rectified voltage according to one embodiment. FIGS. 4a and FIGS. 4b are drawings for explaining stepping down a rectified voltage according to one embodiment. FIG. 5 is a flowchart illustrating operations in boost mode according to one embodiment. FIG. 6 is a flowchart illustrating operations in buck mode according to one embodiment. FIG. 7 is a flowchart for explaining the operations of a method of operating a voltage conversion device according to one embodiment. Specific details for implementing the invention
[0019] Specific structural or functional descriptions of the embodiments are disclosed for illustrative purposes only and may be modified and implemented in various forms. Accordingly, actual implementations are not limited to the specific embodiments disclosed, and the scope of this specification includes modifications, equivalents, or substitutions included in the technical concept described by the embodiments.
[0020] Terms such as "first" or "second" may be used to describe various components, but these terms should be interpreted solely for the purpose of distinguishing one component from another. For example, the first component may be named the second component, and similarly, the second component may be named the first component.
[0021] When it is stated that a component is "connected" to another component, it should be understood that it may be directly connected to or joined to that other component, or that there may be other components in between.
[0022] Singular expressions include plural expressions unless the context clearly indicates otherwise. In this document, phrases such as “A or B,” “at least one of A and B,” “at least one of A or B,” “A, B or C,” “at least one of A, B and C,” and “at least one of A, B, or C” may each include any one of the items listed together with the corresponding phrase, or all possible combinations thereof. In this specification, terms such as “comprising” or “having” are intended to designate the existence of the described feature, number, step, action, component, part, or combination thereof, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof.
[0023] Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as generally understood by those skilled in the art. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and should not be interpreted in an ideal or overly formal sense unless explicitly defined in this specification.
[0024] As used herein, the term "module" may include a unit implemented in hardware, software, or firmware, and may be used interchangeably with terms such as logic, logic block, component, or circuit. A module may be a component formed integrally, or a minimum unit of said component or a part thereof that performs one or more functions. For example, according to one embodiment, a module may be implemented in the form of an application-specific integrated circuit (ASIC).
[0025] A voltage converter (e.g., the voltage converter (100) of FIG. 1) is a device capable of converting a three-phase AC input voltage using one voltage converter circuit and one motor. The voltage converter can effectively solve the problems of the development costs of the voltage converter circuit and motor for motor driving, the problems of increased individual production costs of the voltage converter circuit and motor, and increased management costs.
[0026] Hereinafter, embodiments will be described in detail with reference to the attached drawings. In the description with reference to the attached drawings, identical components are given the same reference numeral regardless of the drawing number, and redundant descriptions thereof will be omitted.
[0028] FIG. 1 is a drawing for explaining the components of a voltage conversion device according to one embodiment.
[0029] Referring to FIG. 1, the voltage converter (100) can convert an input AC voltage and transmit it to a load. For example, the voltage converter (100) may operate in a mode that rectifies the input AC voltage and transmits the rectified voltage (e.g., rectification mode), in a mode that increases the magnitude of the rectified voltage and transmits it (e.g., boost mode), or in a mode that decreases the magnitude of the rectified voltage and transmits it (e.g., buck mode). The operation of the voltage converter (100) in the rectification mode will be described in detail in FIG. 2, the operation in the boost mode in FIG. 3a and FIG. 3b, and the operation in the buck mode in FIG. 4a and FIG. 4b.
[0030] The voltage conversion device (100) may include a rectifier module (110), a reactor module (120), a converter power module (130), a capacitor module (140), and an inverter power module (150). Each component of the voltage conversion device (100) will be described below.
[0031] A rectifier module (110) according to one embodiment can rectify an AC input voltage. For example, the rectifier module (110) may include a bridge diode and can rectify the input AC input voltage to generate a DC voltage. The rectifier module (110) may include a first terminal (e.g., terminal (221) of FIG. 2) and a second terminal (e.g., terminal (222) of FIG. 2) corresponding to output terminals. The rectifier module (110) may be connected to a reactor module (120) or a converter power module (130) through the first terminal and may be connected to a converter power module (130) through the second terminal.
[0032] A reactor module (120) according to one embodiment can store energy from a rectified voltage output from a rectifier module (110). The reactor module (120) may include one or more inductors. An inductor is a component capable of converting electrical energy into magnetic energy and storing it. The reactor module (120) includes a third terminal (e.g., a third terminal (231)) corresponding to an input terminal of the reactor module (120), and the third terminal may be connected to a first output terminal of the rectifier module (110).
[0033] A converter power module (130) according to one embodiment may be connected to a reactor module (120) to deliver, boost, or step down a rectified voltage. The converter power module (130) includes a fourth terminal (e.g., the fourth terminal (232) of FIG. 2), a fifth terminal (e.g., the fifth terminal (241) of FIG. 2), and a sixth terminal (e.g., the sixth terminal (242) of FIG. 2), and the fourth terminal and the sixth terminal may be connected to a common node. The converter power module (130) may include first switches (e.g., the first switches (132) of FIG. 2) connected to the fifth terminal and the output terminal of the reactor module (120), and first freewheeling diodes (e.g., the first freewheeling diode (131) of FIG. 2) connected in parallel to each of the first switches. The converter power module (130) may include second switches (e.g., second switches (133) of FIG. 2) connected to the sixth terminal and the output terminal of the reactor module (120), and second freewheeling diodes (e.g., second freewheeling diodes (134) of FIG. 2) connected in parallel to each of the second switches. The switches can turn on or off the connection of the circuit (specifically, the connection between circuit components). The converter power module (130) delivering the rectified voltage is described in detail in FIG. 2, boosting the rectified voltage is described in FIG. 3a and FIG. 3b, and stepping down the rectified voltage is described in FIG. 4a and FIG. 4b.
[0034] A capacitor module (140) according to one embodiment is a circuit component capable of storing electrical energy of a DC voltage output from a converter power module (130) and reducing ripple of a current signal or voltage signal. The capacitor module (140) may include one or more capacitors. The capacitor module (140) may be connected to the converter power module (130) through a seventh terminal (e.g., the seventh terminal (251) in FIG. 2) and an eighth terminal (e.g., the eighth terminal (252) in FIG. 2). The capacitor module (140) may reduce the ripple of the DC voltage received from the converter power module (130) and deliver the DC voltage with reduced ripple to the inverter power module (150).
[0035] An inverter power module (150) according to one embodiment can output an AC voltage to a load (e.g., a load (260) in FIG. 2) using a rectified voltage whose voltage level is regulated by a converter power module (130). For example, the inverter power module (150) can convert the boosted rectified voltage into an AC voltage and deliver it to the load (e.g., a load (260) in FIG. 2). The inverter power module (150) includes a seventh terminal and an eighth terminal corresponding to input terminals and can be connected to a capacitor module (140) and a converter power module (130) through the seventh terminal and the eighth terminal.
[0036] The voltage converter (100) can step up or step down the rectified input voltage using a single voltage conversion system. As described above, for example, the voltage converter (100) can rectify a three-phase AC input voltage and change the level of the rectified voltage. The voltage converter (100) may include a converter power module (130) comprising a rectifier module (110), a plurality of switches, and freewheeling diodes. The voltage converter (100) can change the level of the three-phase AC input voltage by changing the connection and / or operation mode of the terminals according to the magnitude of the input voltage. For example, when the input AC voltage is an RMS value of 380V, the voltage converter (100) can transmit the rectified input voltage as is using only the rectifier module (110) and the inverter power module (150). When the input AC voltage is an RMS value of 220V, the voltage converter (100) can step up the rectified input voltage using a boost mode. When the input AC voltage is an RMS value of 480V, the voltage converter (100) can reduce the rectified input voltage using a buck mode.
[0038] FIG. 2 is a diagram illustrating a rectification mode that transmits a rectified voltage according to one embodiment.
[0039] Referring to FIG. 2, a voltage converter (e.g., the voltage converter (100) of FIG. 1) can transmit a rectified voltage to an inverter power module (150) (rectification mode) when the input voltage (210) is an AC voltage with an effective value of 380V.
[0040] A rectifier module (110) according to one embodiment can rectify and output an AC voltage of an effective value of 380V into a DC voltage of 540V. In rectification mode, the first terminal (221) of the rectifier module (110) is connected to the third terminal (231) of the reactor module (120), and the second terminal (222) of the rectifier module (110) is connected to the fourth terminal (232) of the converter power module (130).
[0041] In a rectification mode according to one embodiment, the first switches (132) and the second switches (133) of the converter power module (130) are turned off, and the output current of the reactor module (120) can be output through the first freewheeling diodes (131). Since the output current is in the opposite direction to the allowed current flow of the second freewheeling diodes (134), it cannot flow through the second freewheeling diodes (134). In the rectification mode, the fifth terminal (241) of the converter power module (130) is connected to the seventh terminal (251) of the inverter power module (150), and the sixth terminal (242) of the converter power module (130) is connected to the eighth terminal (252) of the inverter power module (150).
[0042] The current output through the first freewheeling diodes (131) according to one embodiment can be delivered to the capacitor module (140) and the inverter power module (150). In rectification mode, a DC voltage of 540V can be output from the output terminals (241, 242) of the converter power module (130) and delivered to the capacitor module (140).
[0044] FIGS. 3a and FIGS. 3b are drawings for explaining the step-up of a rectified voltage according to one embodiment.
[0045] Referring to FIGS. 3a and 3b, the converter power module (130) can output a DC voltage of 540V that is boosted based on an AC voltage (210) of an RMS value of 220V. A converter power module (130) according to one embodiment may include first switches (132), first freewheeling diodes (131), second switches (133), and second freewheeling diodes (134). The converter power module (150) can perform a boost mode (or boost) operation by turning off the first switches (132) and the first freewheeling diodes (131), and by turning the second switches (133) on and off. In one embodiment, the phase of the currents flowing through the second switches (133) and the first freewheeling diodes (134) may differ by 120 degrees, and the number of switches controlled among the first switches (132) and the second switches (133) may be determined according to the load rate of the load (260) connected to the inverter power module (150).
[0046] FIG. 3a is a diagram illustrating the storage of energy corresponding to a rectified voltage according to one embodiment. A rectification module (110) according to one embodiment can rectify an AC voltage (210) of an effective value of 220V and output a DC voltage of 310V. In boost mode, the first terminal (221) of the rectification module (110) is connected to the third terminal (231) of the reactor module (120), and the second terminal (222) of the rectification module (110) is connected to the fourth terminal (232) of the converter power module (130). The fifth terminal (241) of the converter power module (130) is connected to the seventh terminal (251) of the inverter power module (130), and the sixth terminal (242) of the converter power module (130) is connected to the eighth terminal (252) of the inverter power module (150). The output current of the reactor module (120) is output through the second switches (133) by turning off the first switches (132) of the converter power module (130) and turning on the second switches (133). The reactor module (120) can store energy from a DC voltage of 310V.
[0047] FIG. 3b is a diagram illustrating the step-up of a rectified voltage according to one embodiment. A rectification module (110) according to one embodiment can receive an AC voltage (210) with an effective value of 220V. Since the connection relationship of the terminals is the same as the connection relationship of the terminals in FIG. 3a, the description regarding the connection relationship of the terminals is omitted. After energy from a DC voltage of 310V is stored in the reactor module (120), the first switches (132) and the second switches (133) of the converter power module (130) are turned off, and the output current is output through the first freewheeling diodes (131). By adding the voltage applied to the inductor of the reactor module (120) and the rectified voltage based on the AC power source (210), a DC voltage of 540V, which is stepped up, can be output from the output terminals of the converter power module (130).
[0049] FIGS. 4a and FIGS. 4b are drawings for explaining stepping down a rectified voltage according to one embodiment.
[0050] Referring to FIGS. 4a and 4b, the converter power module (130) can output a DC voltage of 540V that is stepped down based on an AC voltage (210) of 480V RMS. A converter power module (130) according to one embodiment may include first switches (132), first freewheeling diodes (131), second switches (133), and second freewheeling diodes (134). In buck mode, the converter power module (130) can perform buck mode (or step-down) operation by turning the first switches (132) on and off and turning the second switches (133) off. The phase of the currents flowing through the first switches (132) may differ by 120 degrees. The number of controlled switches among the first switches (132) may be determined according to the load rate of the load (260) connected to the inverter power module (150). For example, when the load rate is 30%, one switch may be operated, when the load rate is 60%, two switches may be operated, or when the load rate is 100%, three switches may be operated.
[0052] FIG. 4a is a diagram illustrating the storage of energy corresponding to a rectified voltage according to one embodiment.
[0053] A rectifier module (110) according to one embodiment can rectify an AC voltage of an effective value of 480V and output a DC voltage of 680V. In buck mode, the first terminal (221) of the rectifier module (110) is connected to the fifth terminal (241) of the converter power module (130), and the second terminal (222) of the rectifier module (110) is connected to the sixth terminal (242) of the converter power module (130). The rectifier module (110) can output a DC voltage of 680V corresponding to an AC voltage (210) of an effective value of 480V. The third terminal (231) of the reactor module (120) is connected to the seventh terminal (251) of the inverter power module (150), and the fourth terminal (232) of the converter power module (130) is connected to the eighth terminal (252) of the inverter power module (150). The output current of the first switches (132) of the converter power module (130) can be output to the reactor module (120) by turning on the first switches (132) and turning off the second switches (133). The reactor module (120) can store energy from the rectified voltage rectified by the rectification module, which is an AC voltage with an effective value of 480V.
[0054] FIG. 4b is a diagram illustrating stepping down a rectified voltage according to one embodiment. A rectification module (110) according to one embodiment can receive an AC voltage (210) with an effective value of 480V. Since the connection relationship of the terminals is the same as the connection relationship of the terminals in FIG. 4a, the description of the connection relationship of the terminals is omitted. A DC voltage of 540V, stepped down, can be output from the output terminals of the converter power module (130) by combining the voltage applied to the inductor of the reactor module (120) and the rectified voltage based on the AC power source (210).
[0056] FIG. 5 is a flowchart illustrating operations in boost mode according to one embodiment.
[0057] Operations in boost mode can be performed by a voltage converter (e.g., voltage converter (100)). Boost mode is a mode in which the input voltage is rectified to a rectified voltage or the rectified voltage is boosted. In one embodiment, an AC voltage with an effective value of 220V or an effective value of 380V may be applied as an input voltage to the voltage converter.
[0058] In operation (510), the terminals of the converter power module (e.g., the converter power module (130) of FIG. 2) can be connected based on the input voltage. For example, if the input power is an AC voltage with an RMS value of 380V, the terminals of the converter power module are connected for a rectification mode, and if the input power is an AC voltage with an RMS value of 220V, the terminals of the converter power module are connected for a boost mode.
[0059] When the input power is greater than an AC voltage of an effective value of 220V (e.g., when 'yes' in operation (520)), the voltage converter can rectify the input power through operations (530, 540) to convert and maintain an AC voltage of an effective value of 380V into a DC voltage of 540V.
[0060] When the input power is an AC voltage of 220V or less (e.g., 'No' in operation (520)), the voltage converter can output a rectified voltage of 220V AC voltage rectified in operation (550). In operations (560, 570), the voltage converter can output a DC voltage of 540V by boosting the rectified voltage using a converter power module. The converter power module may include one or more switches.
[0061] In operation (580), the voltage converter can operate an inverter power module (e.g., the inverter power module (150) of FIG. 2). The inverter power module can convert the delivered 540V DC voltage into an AC voltage and deliver it to a load (e.g., the load (260) of FIG. 2).
[0062] In operation (590), when the inverter power module converts the transmitted voltage into an AC voltage and transmits it to the load, the voltage converter can determine the number of switches controlled by the converter power module. The number of controlled switches can be determined based on the load rate of the load connected to the inverter power module, and the load rate can be determined based on the average load and the maximum load.
[0064] FIG. 6 is a flowchart illustrating operations in buck mode according to one embodiment.
[0065] Operations in buck mode can be performed by a voltage converter (e.g., voltage converter (100)). Buck mode is a mode in which the input voltage is rectified and the rectified voltage is stepped down. In one embodiment, when the voltage converter operates in buck mode, an AC voltage with an effective value of 480V may be applied to the voltage converter as the input voltage.
[0066] In operation (610), the terminals of the converter power module (e.g., the converter power module (130) of FIG. 2) can be connected based on the input voltage. For example, if the input power is an AC voltage with an RMS value of 480V, the terminal connections of the converter power module can be made to operate the buck mode.
[0067] In operation (620), the voltage converter can operate a rectifier module. For example, when an AC voltage of an RMS value of 480V is applied, the voltage converter can use a rectifier module (e.g., the rectifier module (110) of FIG. 2) to rectify the AC voltage of an RMS value of 480V into a DC voltage of 680V.
[0068] In operation (630), the voltage converter can operate the converter power module.
[0069] In operation (640), the voltage converter can use a converter power module to step down a DC voltage of 680V to a DC voltage of 540V.
[0070] In operation (650), the voltage converter can operate the inverter power module. For example, the voltage converter can use the inverter power module (e.g., the inverter power module (150) of FIG. 2) to convert a DC voltage of 540V into an AC voltage corresponding to the DC voltage of 540V and deliver it to a load (e.g., the load (260) of FIG. 2).
[0071] In operation (660), the voltage converter can determine the number of switches operated by the converter power module according to the load rate. The converter power module may include switches (e.g., the first switches (131) and the second switches (134) of FIG. 2). The number of switches controlled may be determined by the load rate of the load connected to the inverter power module, and the load rate may be determined based on the average load and the maximum load.
[0073] FIG. 7 is a flowchart for explaining the operations of a method of operating a voltage conversion device according to one embodiment.
[0074] The operations of the method of operating the voltage converter device can be performed by the voltage converter device (e.g., the voltage converter device (100) of FIG. 1). The voltage converter device may include a rectifier module (e.g., the rectifier module (110) of FIG. 2), a converter power module (e.g., the converter power module (130) of FIG. 1), a reactor module (e.g., the reactor module (120) of FIG. 1) connected to the input terminal of the converter power module, an inverter power module (e.g., the inverter power module (150) of FIG. 1), and a capacitor module (e.g., the capacitor module (140) of FIG. 1) connected to the input terminals of the inverter power module.
[0075] In operation (710), the voltage converter can receive an AC input voltage. For example, the voltage converter can receive an AC input voltage (e.g., an AC voltage with an RMS value of 220 V, an AC voltage with an RMS value of 380 V, or an AC voltage with an RMS value of 480 V).
[0076] In operation (720), the voltage converter can control the connection relationships between the rectifier module, reactor module, converter power module, capacitor module, and inverter power module based on the voltage level of the input voltage. For example, when the voltage level of the input voltage is an AC voltage with an RMS value of 480V, the rectifier module, reactor module, converter power module, capacitor module, and inverter power module can be controlled to terminal connection relationships for buck mode operation.
[0077] In operation (730), the voltage converter can rectify the input voltage of the alternating current and output the rectified input voltage. For example, if the voltage level of the input voltage is an alternating current voltage of an effective value of 480V, the voltage converter can rectify the alternating current voltage of an effective value of 480V and output a DC voltage of 680V.
[0078] In operation (740), the voltage converter can adjust the voltage level of the rectified input voltage. For example, when a rectified DC voltage of 680V is output in operation (730), the voltage converter can use a converter power module (e.g., the converter power module (130) of FIG. 2) to step down the DC voltage of 680V to a DC voltage of 540V.
[0079] In operation (750), the voltage converter can output an AC voltage to a load based on an input voltage with a voltage level adjusted through an inverter power module (e.g., the inverter power module (150) of FIG. 2). For example, the voltage converter can use the inverter power module to convert the stepped-down DC voltage of 540V of operation (740) into a corresponding AC voltage and output it to a load (e.g., the load (260) of FIG. 2).
[0081] Although the embodiments have been described above with reference to the limited drawings, those skilled in the art can apply various technical modifications and variations based thereon. For example, suitable results may be achieved even if the described techniques are performed in a different order than described, and / or if the components of the described system, structure, device, circuit, etc. are combined or assembled in a form different from described, or replaced or substituted by other components or equivalents.
[0082] Therefore, other implementations, other embodiments, and equivalents to the claims also fall within the scope of the claims set forth below.
Claims
Claim 1 A voltage conversion device for converting the voltage level of an input voltage, comprising: a rectifier module that rectifies an AC input voltage and outputs a rectified input voltage; a converter power module disposed at the output terminal of the rectifier module and regulating the voltage level of the rectified input voltage; a reactor module connected to the input terminal of the converter power module; and an inverter power module that outputs an AC voltage to a load based on the input voltage whose voltage level is regulated by the converter power module.and includes a capacitor module connected to the input terminals of the inverter power module, and the converter power module includes first switches connected to the output terminal of the reactor module and connected in parallel to each of the first freewheeling diodes, and second switches connected to the output terminal of the reactor module and connected in parallel to each of the second freewheeling diodes, the number of switches controlled among the first switches and the second switches is determined according to a load rate determined based on the average load and maximum load of the load connected to the inverter power module, the voltage level of the input voltage is converted by an operation mode according to the magnitude of the input voltage, when the input voltage is an AC voltage with an effective value of 220V input to the rectifier module, the terminals of the converter power module are connected to terminals for a boost mode that steps up the rectified input voltage, and the output terminals of the converter power module output a DC voltage of 540V that is stepped up from the rectified input voltage, and when the input voltage is an AC voltage with an effective value of 380V A voltage conversion device, wherein when a voltage is input to the rectifier module, the terminals of the converter power module are connected for a rectification mode that transmits the rectified input voltage, and the output terminals of the converter power module output a DC voltage of 540V, which is the rectified input voltage; and when the input voltage is an AC voltage with an RMS value of 480V, which is input to the rectifier module, the terminal connections of the converter power module are connected for a buck mode that indicates a mode for stepping down the rectified input voltage, and the output terminals of the converter power module output a DC voltage of 540V, which is the stepped-down rectified input voltage. Claim 2 A voltage conversion device according to claim 1, wherein the rectifier module includes a first terminal and a second terminal corresponding to the output terminals of the rectifier module, the reactor module includes a third terminal corresponding to the input terminal of the reactor module, the converter power module includes a fourth terminal, a fifth terminal and a sixth terminal, the inverter power module includes a seventh terminal and an eighth terminal corresponding to the input terminals of the inverter power module, the fourth terminal and the sixth terminal are connected to a common node, and the capacitor module is connected to the seventh terminal and the eighth terminal. Claim 3 In paragraph 2, the converter power module comprises: first switches connected to the fifth terminal of the converter power module and the output terminal of the reactor module; second switches connected to the sixth terminal of the converter power module and the output terminal of the reactor module; and a voltage conversion device. Claim 4 A voltage conversion device according to claim 3, wherein when the input voltage is an AC voltage with an effective value of 380V, the first terminal of the rectifier module is connected to the third terminal of the reactor module, the second terminal of the rectifier module is connected to the fourth terminal of the converter power module, the fifth terminal of the converter power module is connected to the seventh terminal of the inverter power module, and the sixth terminal of the converter power module is connected to the eighth terminal of the inverter power module. Claim 5 A voltage conversion device according to claim 4, wherein the output current of the reactor module is output through the first freewheeling diodes by turning off the first switches and the second switches, and the DC voltage of 540V is output from the output terminals of the converter power module. Claim 6 A voltage conversion device according to claim 3, wherein when the input voltage is an AC voltage with an effective value of 220V, the first terminal of the rectifier module is connected to the third terminal of the reactor module, the second terminal of the rectifier module is connected to the fourth terminal of the converter power module, the fifth terminal of the converter power module is connected to the seventh terminal of the inverter power module, and the sixth terminal of the converter power module is connected to the eighth terminal of the inverter power module. Claim 7 A voltage conversion device according to claim 6, wherein the output current of the reactor module is output through the second switches by the first switches being turned off and the second switches being turned on, and the reactor module stores energy from the rectified voltage rectified by the rectification module of the alternating voltage of the effective value of 220V. Claim 8 A voltage conversion device according to claim 7, wherein, by turning off the first switches and the second switches, the output current is output through the first freewheeling diodes by the reactor module, and a DC voltage of 540V (volt) is output from the output terminals of the converter power module, with the rectified voltage being boosted. Claim 9 A voltage conversion device according to claim 3, wherein when the input voltage is an AC voltage with an effective value of 480V, the first terminal of the rectifier module is connected to the fifth terminal of the converter power module, the second terminal of the rectifier module is connected to the sixth terminal of the converter power module, the third terminal of the reactor module is connected to the seventh terminal of the inverter power module, and the fourth terminal of the converter power module is connected to the eighth terminal of the inverter power module. Claim 10 A voltage conversion device according to claim 9, wherein the output current of the first switches is output to the reactor module by turning the first switches on and turning the second switches off, and the reactor module stores energy from the rectified voltage rectified by the rectification module of the alternating current voltage of the effective value of 480V. Claim 11 A voltage conversion device according to claim 10, wherein a DC voltage of 540V (volt) is output from the output terminals of the converter power module, wherein the rectified voltage is stepped down by turning off the first switches and the second switches. Claim 12 delete Claim 13 A method of operation of a voltage conversion device comprising a rectifier module, a converter power module, a reactor module connected to an input terminal of the converter power module, an inverter power module, and a capacitor module connected to the input terminals of the inverter power module, the method comprising: receiving an AC input voltage; controlling the connection relationship between the rectifier module, the reactor module, the converter power module, the capacitor module, and the inverter power module based on a voltage level of the input voltage; rectifying the AC input voltage through the rectifier module and outputting the rectified input voltage; and adjusting the voltage level of the rectified input voltage through the converter power module.The method includes an operation of outputting an AC voltage to a load based on an input voltage with a regulated voltage level through the inverter power module, wherein the converter power module includes first switches connected to the output terminal of the reactor module and connected in parallel to each of the first freewheeling diodes, and second switches connected to the output terminal of the reactor module and connected in parallel to each of the second freewheeling diodes, wherein the number of switches controlled among the first switches and the second switches is determined according to a load rate determined based on the average load and maximum load of the load connected to the inverter power module, wherein the voltage level of the input voltage is converted by an operation mode according to the magnitude of the input voltage, wherein when the input voltage is an AC voltage with an RMS value of 220V input to the rectifier module, the terminals of the converter power module are connected to terminals for a boost mode that steps up the rectified input voltage, and the output terminals of the converter power module output a DC voltage of 540V that is stepped up from the rectified input voltage, and wherein the input voltage A method of operation in which, when an AC voltage of an effective value of 380V is input to the rectifier module, the terminals of the converter power module are connected for a rectification mode that transmits the rectified input voltage, and the output terminals of the converter power module output a DC voltage of 540V, which is the rectified input voltage; and when an AC voltage of an effective value of 480V is input to the rectifier module, the terminal connections of the converter power module are connected for a buck mode that indicates a mode for stepping down the rectified input voltage, and the output terminals of the converter power module output a DC voltage of 540V, which is the stepped-down rectified input voltage.