Power conversion system and power conversion method

Abstract

This power conversion system comprises: a power conversion unit that includes a plurality of switching elements and performs a power conversion operation through the plurality of switching elements; and a control unit that performs a first operation for driving the plurality of switching elements in a first control period including a plurality of first switching periods, and drives, on the basis of a result of the first operation, the plurality of switching elements in a second control period including a plurality of second switching periods after the first control period.

Description

Power conversion system and power conversion method

[0001] The disclosed invention relates to a power conversion system and a power conversion method that perform operations for driving a plurality of switching elements in one control cycle.

[0002] Power conversion can be performed through a power conversion system such as DC / DC, AC / DC, DC / AC, or AC / AC. The power conversion system includes a power conversion device including a plurality of switching elements and a controller for driving the plurality of switching elements of the power conversion device, and can perform efficient power conversion by controlling the driving of the plurality of switching elements of the power conversion device through the controller.

[0003] Controllers require computational time to calculate control signals for driving multiple switching elements. However, recently, to improve power conversion efficiency, switching elements with fast switching cycles have been utilized. This leads to the problem of inaccurate switching element control due to the switching cycle being faster than the controller's computational time.

[0004] One aspect of the disclosed invention can provide a power conversion system and a power conversion method capable of performing an operation for driving a plurality of switching elements in one control cycle and driving the plurality of switching elements according to the result of the operation in the next control cycle of the one control cycle.

[0005] A power conversion system according to the present disclosure may include a power conversion unit that includes a plurality of switching elements and performs a power conversion operation through the plurality of switching elements; and a control unit that performs a first operation for driving the plurality of switching elements in a first control period including a first plurality of switching periods, and drives the plurality of switching elements in a second control period including a second plurality of switching periods after the first control period based on a result of the first operation.

[0006] The power conversion system further includes a current sensor that detects an output current output from the power conversion unit and generates information about the output current; and the control unit can perform at least a part of the first operation based on the information generated by the current sensor in at least one switching cycle among the first plurality of switching cycles.

[0007] The first plurality of switching periods includes a first switching period and a plurality of second switching periods, and the control unit can perform at least a part of the first operation in the first control period including at least a part of the plurality of second switching periods based on information generated by the current sensor in the first switching period.

[0008] The first switching period may be longer than each of the plurality of second switching periods.

[0009] The starting point of the first switching cycle may be the same as the starting point of the first control cycle.

[0010] The center point of the first switching cycle may be the same as the center point of the first control cycle.

[0011] The second plurality of switching periods includes a third switching period and a plurality of fourth switching periods, and the control unit can drive the plurality of switching elements in the second control period including the third switching period and the plurality of fourth switching periods based on a result of a first operation performed in at least some of the second plurality of switching periods.

[0012] The control unit may perform a second operation for driving the plurality of switching elements in the second control period including at least a portion of the plurality of fourth switching periods, based on information generated by the current sensor in the third switching period.

[0013] The control unit can drive the plurality of switching elements based on the result of the second operation in a third control cycle following the second control cycle.

[0014] The sum of the durations of the first plurality of switching periods may be set longer than the first operation period required for the first operation, or the sum of the durations of the second plurality of switching periods may be set longer than the second operation period required for the second operation.

[0015] A power conversion method according to the present disclosure may include a power conversion method of a power conversion system including a power conversion unit that includes a plurality of switching elements and performs a power conversion operation through the plurality of switching elements, the method comprising: performing a first operation for driving the plurality of switching elements in a first control period including a first plurality of switching periods; and driving the plurality of switching elements in a second control period including a second plurality of switching periods after the first control period based on a result of the first operation.

[0016] The power conversion system may further include a current sensor that detects an output current output from the power conversion unit and generates information about the output current; and performing the first operation may include performing at least a part of the first operation based on the information generated by the current sensor in at least one switching period among the first plurality of switching periods.

[0017] The first plurality of switching periods may include a first switching period and a plurality of second switching periods, and performing the first operation may include performing at least a portion of the first operation in the first control period, which includes at least a portion of the plurality of second switching periods, based on information generated by the current sensor in the first switching period.

[0018] The first switching period may be longer than each of the plurality of second switching periods.

[0019] The starting point of the first switching cycle may be the same as the starting point of the first control cycle.

[0020] According to one aspect of the present disclosure, even if the switching element is driven according to a high-speed switching cycle, there is a better effect in that the driving of the switching element can be controlled more precisely by performing an operation for driving the switching element in the next control cycle in one control cycle.

[0021] According to one aspect of the present disclosure, there is a better effect in that the section for detecting the output current flowing through the resistance element in one control cycle is made relatively long, and in the section for not detecting the output current flowing through the resistance element, the switching element is driven according to a high-speed switching cycle, and an operation for driving the switching element is performed to control the driving of the switching element more precisely in the cycle following the one control cycle.

[0022] The effects that can be obtained from the present disclosure are not limited to the effects mentioned above, and other effects that are not mentioned can be clearly understood by a person having ordinary skill in the art to which the present disclosure belongs from the description below.

[0023] FIG. 1 is a diagram for explaining the operation between a power conversion system and various configurations according to one embodiment.

[0024] FIG. 2 is a control block diagram of a power conversion system according to one embodiment.

[0025] FIG. 3 is a diagram for explaining the operation between a power conversion system and various configurations according to one embodiment.

[0026] Figure 4 is a drawing for explaining the relationship between a conventional switching cycle and a control cycle.

[0027] Figure 5 is a drawing for explaining a problem according to the relationship between the conventional switching cycle and the control cycle.

[0028] FIG. 6 is a diagram for explaining a section in which a current sensor detects an output current, according to one embodiment.

[0029] FIG. 7 is a flowchart for explaining a method of driving a switching element according to an operation and an operation result in a control cycle of a power conversion system according to one embodiment.

[0030] FIG. 8 is a diagram for explaining the relationship between the control cycle and the switching cycle of a power conversion system according to one embodiment.

[0031] FIG. 9 is a diagram for explaining an operation for driving a switching element for a plurality of control cycles according to one embodiment and a method for driving the switching element according to the operation result.

[0032] FIG. 10 is a diagram for explaining an operation for driving a switching element for a plurality of control cycles according to one embodiment and a method for driving the switching element according to the operation result.

[0033] The embodiments described in this specification and the configurations illustrated in the drawings are merely preferred examples of the disclosed invention, and there may be various modified examples that can replace the embodiments and drawings of this specification at the time of filing of this application.

[0034] The terminology used herein is for the purpose of describing embodiments only and is not intended to limit and / or restrict the disclosed invention.

[0035] For example, in this specification, a singular expression may include a plural expression unless the context clearly indicates otherwise.

[0036] In this document, each of the phrases "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 include any one of the items listed together in that phrase, or all possible combinations thereof.

[0037] The term "and / or" includes any combination of a plurality of related described elements or any one of a plurality of related described elements.

[0038] Terms such as "first," "second," or "first" or "second" may be used simply to distinguish one component from another and do not qualify the components in any other respect (e.g., importance or order).

[0039] When a component (e.g., a first component) is referred to as being "coupled" or "connected" to another component (e.g., a second component), with or without the terms "functionally" or "communicatively," it means that the component can be connected to the other component directly (e.g., wired), wirelessly, or through a third component.

[0040] The terms "include" or "have" are intended to specify the presence of a feature, number, step, operation, component, part or combination thereof described in this document, but do not preclude the presence or addition of one or more other features, numbers, steps, operations, components, parts or combinations thereof.

[0041] When a component is said to be “connected,” “coupled,” “supported,” or “in contact with” another component, this includes not only cases where the components are directly connected, coupled, supported, or in contact, but also cases where the components are indirectly connected, coupled, supported, or in contact through a third component.

[0042] When we say that a component is "on" another component, this includes not only cases where the component is in contact with the other component, but also cases where there is another component between the two components.

[0043] Additionally, terms such as "~part", "~device", "~block", "~absence", and "~module" may refer to a unit that processes at least one function or operation. For example, the terms may refer to at least one hardware such as an FPGA (field-programmable gate array) / ASIC (application specific integrated circuit), at least one software stored in a memory, or at least one process processed by a processor.

[0044] Below, a power conversion system according to various embodiments is specifically described with reference to the attached drawings.

[0045] FIG. 1 is a diagram for explaining the operation between a power conversion system and various configurations according to one embodiment.

[0046] Referring to FIG. 1, the power supply unit (50) can supply power to the power conversion unit (200). For example, the power supply unit (50) can supply a direct current voltage to the power conversion unit (200).

[0047] The power supply unit (50) may include an EMI filter for removing noise from the AC voltage supplied from the commercial power source, a power factor correction circuit (PFC) for compensating the power factor of the power conversion system (1), a converter for converting the AC voltage supplied from the commercial power source into a DC voltage through a switching operation, and / or an output capacitor to which the DC voltage is applied, in order to convert the AC voltage supplied from the commercial power source into a DC voltage and supply the converted DC voltage to the power conversion unit (200).

[0048] The power conversion system (1) may include a power conversion unit (200), a current sensor (300), and / or a control unit (100).

[0049] The power conversion unit (200) can perform a power conversion operation using the DC voltage supplied from the power supply unit (50).

[0050] The power conversion operation may include an operation of converting a direct current voltage supplied from a power supply unit (50) into an alternating current voltage. In this case, the power conversion unit (200) may be referred to as an inverter.

[0051] However, the power conversion operation according to the present disclosure is not limited thereto. For example, the power supply unit (50) may supply an AC voltage to the power conversion unit (200), and the power conversion operation may include an operation of converting the AC voltage supplied from the power supply unit (50) into a DC voltage. In this case, the power conversion unit (200) may be referred to as a converter.

[0052] Hereinafter, for convenience of explanation, the power conversion operation is described as an operation of converting the direct current voltage supplied from the power supply unit (50) into alternating current voltage.

[0053] The power conversion unit (200) can supply the converted AC voltage to the motor (60) through a power conversion operation.

[0054] The fact that the power conversion unit (200) supplies the AC voltage converted through the power conversion operation to the motor (60) may mean that the power conversion unit (200) supplies the output current (Ia, Ib, Ic, see FIG. 3) output through the power conversion operation to the motor (60).

[0055] The current sensor (300) can detect the output current (Ia, Ib, Ic) output from the power conversion unit (200).

[0056] The current sensor (300) detecting the output current (Ia, Ib, Ic) may include converting an analog signal output from the power conversion unit (200) into a digital signal and estimating the output current (Ia, Ib, Ic) output from the power conversion unit (200) from the converted digital signal.

[0057] The current sensor (300) can transmit information about the detected output current (Ia, Ib, Ic) to the control unit (100). For example, the current sensor (300) can convert an analog signal output from the power conversion unit (200) into a digital signal, estimate the output current (Ia, Ib, Ic) output from the power conversion unit (200) from the converted digital signal, and transmit information about the estimated output current to the control unit (100).

[0058] The control unit (100) can generate a control signal (S) based on the output current (Ia, Ib, Ic) detected by the current sensor (300). The control signal refers to a switching control signal (S) to be described later. For example, the control unit (100) can receive information about the estimated output current from the current sensor (300) and generate a control signal (S) for the power conversion operation of the power conversion unit (200) based on the estimated output current.

[0059] The control unit (100) can transmit a control signal (S) to the power conversion unit (200), and the power conversion unit (200) can perform a power conversion operation according to the control signal (S).

[0060] The motor (60) can be driven based on the output current (Ia, Ib, Ic) supplied from the power conversion unit (200). The motor (60) has a stator and a rotor, and an AC voltage is applied to the coil of the stator to cause the rotor to rotate.

[0061] The motor (60) may include a surface-mounted permanent-magnet synchronous motor (SMPMSM), an interior permanent magnet synchronous motor (IPMSM), and a synchronous reluctance motor (Synrm).

[0062] FIG. 2 is a control block diagram of a power conversion system according to one embodiment.

[0063] The control unit (100) may include a switching control signal generation unit (110) and / or an operation unit (120).

[0064] The operation unit (120) can perform an operation based on the output current (Ia, Ib, Ic) detected by the current sensor (300).

[0065] The operation unit (120) performing the operation may include the operation unit (120) performing various operations to determine the switching control signal (S) to be generated by the switching control signal generation unit (110).

[0066] For example, the operation unit (120) can obtain a voltage command for determining a switching control signal (S) from the output current (Ia, Ib, Ic) detected by the current sensor (300), and determine the switching control signal (S) to be generated by the switching control signal generation unit (110) based on the obtained voltage command.

[0067] The switching control signal generation unit (110) can generate a switching control signal (S) based on the operation result calculated by the operation unit (120). For example, the switching control signal generation unit (110) can generate the switching control signal (S) based on the voltage command obtained by the operation unit (120) by a space vector-based pulse width modulation (SVPWM) method.

[0068] The switching control signal generation unit (110) can supply the generated switching control signal (S) to the power conversion unit (200). In addition, the switching control signal (S) can be converted into a gate driving signal in a gate driving unit (not shown) and supplied to the power conversion unit (200).

[0069] The power conversion unit (200) performs a power conversion operation according to a switching control signal (S) generated based on the output current (Ia, Ib, Ic) detected by the current sensor (300), and the motor (60) can be driven according to the output current (Ia, Ib, Ic) output by the power conversion operation of the power conversion unit (200).

[0070] FIG. 3 is a diagram for explaining the operation between a power conversion system and various configurations according to one embodiment.

[0071] The power conversion unit (200) may include a plurality of switching elements. For example, the power conversion unit (200) may include an upper switching element and a lower switching element. The upper switching element may include a first upper switching element (Sa1), a second upper switching element (Sb1), and a third upper switching element (Sc1). The lower switching element may include a first lower switching element (Sa2), a second lower switching element (Sb2), and a third lower switching element (Sc2).

[0072] The first upper switching element (Sa1) and the first lower switching element (Sa2) are first phase switching elements (Sa, see Fig. 6) corresponding to one of the three phases.

[0073] The second upper switching element (Sb1) and the second lower switching element (Sb2) are second phase switching elements (Sb, see Fig. 6) corresponding to one of the three phases.

[0074] The third upper switching element (Sc1) and the third lower switching element (Sc2) are first phase switching elements (Sc, see Fig. 6) corresponding to one of the three phases.

[0075] Turning on the first phase switching element (Sa) means that the first upper switching element (Sa1) is turned on and the first lower switching element (Sa2) is turned off. Turning off the first phase switching element (Sa) means that the first upper switching element (Sa1) is turned off and the first lower switching element (Sa2) is turned on.

[0076] Turning on the second phase switching element (Sb) means that the second upper switching element (Sb1) is turned on and the second lower switching element (Sb2) is turned off. Turning off the second phase switching element (Sb) means that the second upper switching element (Sb1) is turned off and the second lower switching element (Sb2) is turned on.

[0077] Turning on the third phase switching element (Sc) means that the third upper switching element (Sc1) is turned on and the third lower switching element (Sc2) is turned off. Turning off the third phase switching element (Sc) means that the third upper switching element (Sc1) is turned off and the third lower switching element (Sc2) is turned on.

[0078] A first output current (Ia) can be supplied to the motor (60) through a phase connected to the first phase switching element (Sa).

[0079] A second output current (Ib) can be supplied to the motor (60) through a phase connected to the second phase switching element (Sb).

[0080] A third output current (Ic) can be supplied to the motor (60) through a phase connected to the third phase switching element (Sc).

[0081] Each of the plurality of switching elements may include an IGBT switch, a GaN switch, a SiC switch, or the like.

[0082] The power conversion unit (200) can perform a power conversion operation through a plurality of switching elements. For example, the power conversion unit (200) can convert a direct current voltage supplied from a power supply unit (50) through on / off operations of a plurality of switching elements to output an alternating current (Ia, Ib, Ic).

[0083] The current sensor (300) is connected between the power supply unit (50) and the power conversion unit (200) and can detect the output current (Ia, Ib, Ic) output by the power conversion unit (200).

[0084] For example, the current sensor (300) may include one resistive element (not shown), sample the current flowing between the power supply unit (50) and the power conversion unit (200) through the resistive element, convert the sampled current into a digital signal through analog / digital signal conversion (A / D conversion), and estimate the output current (Ia, Ib, Ic) from the converted digital signal.

[0085] A method like this may be referred to as a 1-shunt method. However, the method of detecting the output currents (Ia, Ib, Ic) according to the present disclosure is not limited thereto. For example, the current sensor (300) may detect the output currents (Ia, Ib, Ic) using a 2-shunt method or a 3-shunt method that includes two or more resistance elements (not shown).

[0086] The operation unit (120) can perform an operation for driving a plurality of switching elements based on the output currents (Ia, Ib, Ic) detected by the current sensor (300). The switching control signal generation unit (110) can generate a switching control signal (S) for driving a plurality of switching elements based on the result of the operation for driving a plurality of switching elements based on the output currents (Ia, Ib, Ic) detected by the current sensor (300).

[0087] Figure 4 is a drawing for explaining the relationship between a conventional switching cycle and a control cycle.

[0088] Referring to FIG. 4, the conventional technology starts a sensing cycle (Tsen) for detecting output currents (Ia, Ib, Ic) at a starting point (T0) where one cycle of a switching cycle (Tsw) starts, starts an operation cycle (To) for performing an operation when the sensing cycle (Tsen) ends, and controls the operation of a switching element in a switching cycle after an end point (T1) where the switching cycle (Tsw) ends, based on the result of the operation, when the operation cycle (T0) ends.

[0089] Detecting the output current (Ia, Ib, Ic) and performing calculations using the output current (Ia, Ib, Ic) can be called a control calculation, and the sum of the sensing cycle (Tsen) for detecting the output current (Ia, Ib, Ic) and the calculation cycle (To) required for calculation using the output current (Ia, Ib, Ic) can mean a control calculation cycle (Tco).

[0090] According to this, a control operation is performed during a switching cycle (Tsw) so that an operation can be performed to drive the switching element in the next switching cycle.

[0091] Figure 5 is a drawing for explaining a problem according to the relationship between the conventional switching cycle and the control cycle.

[0092] To improve motor control efficiency, a switching element capable of operating at a fast switching cycle is used. Accordingly, referring to Fig. 5, since the control operation cycle (Tco) is longer than the switching cycle (Tsw), there is a problem in that control operations are not performed during the switching cycle (Tsw). Consequently, the operation of the switching element in the switching cycle following the switching cycle (Tsw) cannot be accurately controlled. To address this issue, there may be a way to increase the speed of the control operation, but this may increase the cost of the power conversion system.

[0093] FIG. 6 is a diagram for explaining a section in which a current sensor detects an output current, according to one embodiment.

[0094] Referring to FIG. 6, the control unit (100) can drive a plurality of switching elements so that the power conversion unit (200) performs a power conversion operation. For example, the control unit (100) can control the first phase switching element (Sa) so that the first phase switching element (Sa) turns on or off in the switching period (Tsw). The control unit (100) can control the second phase switching element (Sb) so that the second phase switching element (Sb) turns on or off in the switching period (Tsw). The control unit (100) can control the third phase switching element (Sc) so that the third phase switching element (Sc) turns on or off in the switching period (Tsw).

[0095] In Fig. 6, the "?" section means a section in which the switching element is turned off, and the "1" section means a section in which the switching element is turned on. For example, the section in which the first phase switching element (Sa) is turned on is the "?" section, and the section in which the first phase switching element (Sa) is turned off is the "1" section.

[0096] The current sensor (300) can detect the output current (Ia, Ib, Ic) output from the power converter (200) in the sensing cycle (Tsen).

[0097] For example, the current sensor (300) can detect at least one output current among the output currents (Ia, Ib, Ic) in a sensing period (Tsen1) in which the first phase switching element (Sa) is turned on and the second phase switching element (Sb) and the third phase switching element (Sc) are turned off.

[0098] As another example, the current sensor (300) can detect at least one output current among the output currents (Ia, Ib, Ic) in a sensing cycle (Tsen2) in which the first phase switching element (Sa) and the second phase switching element (Sb) are turned on and the third phase switching element (Sc) is turned off.

[0099] When the switching period (Tsw) is short, the current sensor (300) may not detect the output current (Ia, Ib, Ic) in the sensing period (Tsen), or the sensing period (Tsen) for detecting the output current (Ia, Ib, Ic) may become long. After the minimum sensing time (Tmin), which is the sum of the setting time, dead time, and A / D conversion time due to the ringing phenomenon caused by multiple switching elements, the sampling process is performed, and the output current (Ia, Ib, Ic) can be detected according to the sampling process. However, when the switching period (Tsw) is short, the minimum sensing time (Tmin) is not secured, so the output current (Ia, Ib, Ic) may not be detected, or the sensing period (Tsen) for detecting the output current (Ia, Ib, Ic) may become long.

[0100] Below, a method for controlling the operation of a switching element without increasing the speed of the control operation according to a temporary example is described.

[0101] FIG. 7 is a flowchart for explaining a method of driving a switching element according to an operation and an operation result in a control cycle of a power conversion system according to one embodiment.

[0102] FIG. 8 is a diagram for explaining the relationship between the control cycle and the switching cycle of a power conversion system according to one embodiment.

[0103] Referring to FIGS. 7 and 8, the current sensor (300) can detect the output currents (Ia, Ib, Ic) output from the power converter (200) in the first control period (Ttott1) (1000). For example, the current sensor (300) can detect the output currents (Ia, Ib, Ic) output from the power converter (200) in the first sensing period (Tsen1) of the first control period (Ttott1).

[0104] In one embodiment, the control unit (100) can perform an operation to drive a plurality of switching elements in a first control cycle (Ttot1) (1100).

[0105] For example, the control unit (100) can perform an operation for driving a plurality of switching elements based on the output currents (Ia, Ib, Ic) detected by the current sensor (300) in the first sensing period (Tsen1) during the operation period (To1).

[0106] The first control cycle (Ttot1) may include multiple switching cycles. For example, the first control cycle (Ttot1) may include a first switching cycle (Tsw1) and multiple second switching cycles (Tsw2).

[0107] In one embodiment, the control unit (100) can perform an operation in at least some of the plurality of second switching periods (Tsw2) based on the output currents (Ia, Ib, Ic) detected by the current sensor (300) in the first switching period (Tsw1).

[0108] The first sensing period (Tsen1) and the first switching period (Tsw1) may be the same period. That is, the control unit (100) controls the plurality of switching elements so that the plurality of switching elements are driven according to the first switching period (Tsw1), and the current sensor (300) can detect the output currents (Ia, Ib, Ic) output from the power converter (200) in the first switching period (Tsw1). The control unit (100) can perform an operation during the first operation period (To1) in at least some of the plurality of second switching periods (Tsw2) based on the output currents (Ia, Ib, Ic) detected by the current sensor (300) in the first switching period (Tsw1). The result of the operation for driving the plurality of switching elements can be obtained at the end of the first control operation period (Tco1).

[0109] The second switching cycle (Tsw2) may be a switching cycle in which the switching element does not operate according to the result calculated in the first control cycle (Ttot1).

[0110] The first switching cycle (Tsw1) may be longer than each of the plurality of second switching cycles (Tsw2). That is, the control unit (100) may set the first switching cycle (Tsw1) for detecting the output currents (Ia, Ib, Ic) required for the operation to be long, and may set each of the plurality of second switching cycles (Tsw2) that are not required for the operation to be short.

[0111] FIG. 9 is a diagram for explaining an operation for driving a switching element for a plurality of control cycles according to one embodiment and a method for driving the switching element according to the operation result.

[0112] Referring to FIGS. 7 and 9, in one embodiment, the control unit (100) can drive a plurality of switching elements based on the results of operations performed in the first control cycle (Ttot1) in the second control cycle (Ttot2), which is the cycle following the first control cycle (Ttot1) (1200).

[0113] For example, the control unit (100) determines the length of the switching cycle, the number of switching cycles, the duty cycle of the switching elements, etc. in the second control cycle (Ttot2), which is the next cycle of the first control cycle (Ttot1), based on the operation result performed in the first control cycle (Ttot1), and can drive a plurality of switching elements in the second control cycle (Ttot2) accordingly.

[0114] The second control cycle (Ttot2) may include a third switching cycle (Tsw3) and a plurality of fourth switching cycles (Tsw4).

[0115] The control unit (100) can drive a plurality of switching elements in a third switching period (Tsw3) and a plurality of fourth switching periods (Tsw4) based on the results of the operations performed in the first control period (Ttot).

[0116] For example, the control unit (100) can determine the length of each of the third switching cycle (Tsw3) and the plurality of fourth switching cycles (Tsw4) and the number of the plurality of fourth switching cycles (Tsw4) based on the calculation result in the first control cycle (Ttot1).

[0117] Referring again to FIG. 7, the current sensor (300) can detect the output current (Ia, Ib, Ic) output from the power converter (300) in the second control cycle (Ttot2) (1300).

[0118] Referring to FIG. 9, the current sensor (300) can detect the output current (Ia, Ib, Ic) output from the power converter (300) in the second sensing period (Tsen2) among the second control periods (Ttot2).

[0119] The second sensing cycle (Tsen2) and the third switching cycle (Tsw3) may be the same cycle. That is, the control unit (100) controls the plurality of switching elements so that the plurality of switching elements are driven according to the third switching cycle (Tsw3) based on the result calculated in the first control cycle (Ttot1), and the current sensor (300) can detect the output currents (Ia, Ib, Ic) output from the power converter (200) in the third switching cycle (Tsw3).

[0120] The control unit (100) can perform an operation in the second control cycle (Ttot2) (1400, see FIG. 7).

[0121] The control unit (100) can perform an operation based on the output currents (Ia, Ib, Ic) detected by the current sensor (300) in the third switching period (Tsw3). For example, the control unit (100) can perform an operation during a second operation period (To2) required for the operation in at least some of the plurality of fourth switching periods (Tsw4) based on the output currents (Ia, Ib, Ic) detected by the current sensor (300) in the third switching period (Tsw3).

[0122] In one embodiment, the control unit (100) can control the plurality of switching elements to operate according to a third switching cycle (Tsw3) having the same starting point (t3) as the starting point of the second control cycle (Tsw2).

[0123] The current sensor (300) can detect the output current (Ia, Ib, Ic) output from the power conversion unit (200) in the third switching cycle (Tsw3) having the same starting point (t3) as the starting point of the second control cycle (Tsw2). That is, the current sensor (300) can perform an operation of detecting the output current (Ia, Ib, Ic) output from the power conversion unit (200) from the starting point of the second control cycle (Tsw2).

[0124] The result of the operation for driving a plurality of switching elements in the second control cycle (Ttot2) can be obtained at the end of the second control operation cycle (Tco2).

[0125] The third switching cycle (Tsw3) may be longer than each of the plurality of fourth switching cycles (Tsw4). That is, the control unit (100) may set the third switching cycle (Tsw3) for detecting the output currents (Ia, Ib, Ic) required for the operation to be long, and may set each of the plurality of fourth switching cycles (Tsw4) that are not required for the operation to be short.

[0126] The control unit (100) can drive a plurality of switching elements based on the results of the operations performed in the second control cycle (Ttot2) in the third control cycle (Ttot3) (1500, see FIG. 7).

[0127] For example, the control unit (100) determines the length of the switching cycle, the number of switching cycles, the duty cycle of the switching elements, etc. in the third control cycle (Ttot3), which is the next cycle of the second control cycle (Ttot2), based on the operation result performed in the second control cycle (Ttot2), and can drive a plurality of switching elements in the third control cycle (Ttot3) accordingly.

[0128] The third control cycle (Ttot2) may include a fifth switching cycle (Tsw5) and a plurality of sixth switching cycles (Tsw6).

[0129] The control unit (100) can drive a plurality of switching elements in a fifth switching period (Tsw5) and a plurality of sixth switching periods (Tsw6) based on the results of the operations performed in the second control period (Tto2).

[0130] For example, the control unit (100) can determine the length of each of the fifth switching cycle (Tsw5) and the plurality of sixth switching cycles (Tsw6) and the number of the plurality of sixth switching cycles (Tsw6) based on the calculation result in the second control cycle (Ttot2).

[0131] The current sensor (300) can detect the output current (Ia, Ib, Ic) output from the power converter (300) in the third control cycle (Ttot2).

[0132] For example, the current sensor (300) can detect the output current (Ia, Ib, Ic) output from the power converter (300) in the third sensing period (Tsen3) of the third control period (Ttot3).

[0133] The third sensing cycle (Tsen3) and the fifth switching cycle (Tsw5) may be the same cycle. That is, the control unit (100) controls the plurality of switching elements so that the plurality of switching elements are driven according to the fifth switching cycle (Tsw5) based on the result calculated in the second control cycle (Ttot2), and the current sensor (300) can detect the output currents (Ia, Ib, Ic) output from the power converter (200) in the fifth switching cycle (Tsw5).

[0134] The control unit (100) can perform operations in the third control cycle (Ttot3).

[0135] The control unit (100) can perform an operation based on the output currents (Ia, Ib, Ic) detected by the current sensor (300) in the fifth switching period (Tsw5). For example, the control unit (100) can perform an operation during a third operation period (To3) necessary for the operation in at least some of the plurality of sixth switching periods (Tsw6) based on the output currents (Ia, Ib, Ic) detected by the current sensor (300) in the fifth switching period (Tsw5).

[0136] In one embodiment, the control unit (100) can control the plurality of switching elements to operate according to a fifth switching cycle (Tsw3) having the same starting point (t5) as the starting point of the third control cycle (Tsw3).

[0137] The current sensor (300) can detect the output current (Ia, Ib, Ic) output from the power conversion unit (200) in the fifth switching cycle (Tsw5) having the same starting point (t5) as the starting point of the third control cycle (Tsw3). That is, the current sensor (300) can perform an operation of detecting the output current (Ia, Ib, Ic) output from the power conversion unit (200) from the starting point of the third control cycle (Tsw3).

[0138] The result of the operation for driving multiple switching elements in the third control cycle (Ttot3) can be obtained at the end of the third control operation cycle (Tco3).

[0139] The fifth switching cycle (Tsw5) may be longer than each of the plurality of sixth switching cycles (Tsw6). That is, the control unit (100) may set the fifth switching cycle (Tsw5) for detecting the output currents (Ia, Ib, Ic) required for the operation to be long, and may set each of the plurality of sixth switching cycles (Tsw6) that are not required for the operation to be short.

[0140] In one embodiment, the control unit (100) can set the sum of the plurality of switching cycles to be longer than the required operation cycle.

[0141] For example, in the first control cycle (Ttot1), the control unit (100) can set the sum of the first switching cycle (Tsw1) and a plurality of second switching cycles (Tsw2) to be longer than the first operation cycle (To1).

[0142] For another example, in the second control cycle (Ttot1), the control unit (100) can set the sum of the third switching cycle (Tsw3) and the plurality of fourth switching cycles (Tsw4) to be longer than the second operation cycle (To2).

[0143] For example, in the third control cycle (Ttot3), the control unit (100) can set the sum of the fifth switching cycle (Tsw5) and the plurality of sixth switching cycles (Tsw6) to be longer than the third operation cycle (To3).

[0144] FIG. 10 is a diagram for explaining an operation for driving a switching element for a plurality of control cycles according to one embodiment and a method for driving the switching element according to the operation result.

[0145] In one embodiment, the control unit (100) can control the plurality of switching elements to operate according to a first switching cycle (Tsw1) having a starting point that is the same as the center point (t2) of the first control cycle (Tsw1).

[0146] The current sensor (300) can detect the output current (Ia, Ib, Ic) output from the power converter (200) in the first switching period (Tsw1) having the same center point (t2) as the center point of the first control period (Tsw1). That is, the current sensor (300) can perform an operation of detecting the output current (Ia, Ib, Ic) output from the power converter (200) in the section including the center point (t2) of the first control period (Tsw1).

[0147] In one embodiment, the control unit (100) can control the plurality of switching elements to operate according to a third switching cycle (Tsw3) having a starting point that is the same as the center point (t4) of the second control cycle (Tsw2).

[0148] The current sensor (300) can detect the output current (Ia, Ib, Ic) output from the power conversion unit (200) in the third switching period (Tsw3) having the same center point (t4) as the center point of the second control period (Tsw2). That is, the current sensor (300) can perform an operation of detecting the output current (Ia, Ib, Ic) output from the power conversion unit (200) in a section including the center point (t4) of the second control period (Tsw2).

[0149] According to the present disclosure, a switching element can be driven to perform a switching operation according to a high-speed switching cycle by performing an operation in one control cycle and then reflecting the operation result in the next control cycle, thereby providing a better effect of increasing the efficiency of power conversion.

[0150] A power conversion system according to one embodiment of the present disclosure includes a power conversion unit that includes a plurality of switching elements and performs a power conversion operation through the plurality of switching elements; and a control unit that performs an operation for driving the plurality of switching elements in a first control period and drives the plurality of switching elements based on a result of the operation in a second control period following the first control period; wherein each of the first control period and the second control period may include a plurality of switching periods.

[0151] A current sensor for detecting an output current output from a power conversion unit is further included, and the control unit can perform an operation based on the output current detected by the current sensor in the first control cycle.

[0152] The first control cycle includes a first switching cycle and a plurality of second switching cycles, and the control unit can perform an operation in at least some of the plurality of second switching cycles based on an output current detected by a current sensor in the first switching cycle.

[0153] The first switching period may be longer than each of the plurality of second switching periods.

[0154] The starting point of the first switching cycle may be the same as the starting point of the first control cycle.

[0155] The center point of the first switching cycle may be the same as the center point of the first control cycle.

[0156] The second control cycle includes a third switching cycle and a plurality of fourth switching cycles, and the control unit can control the plurality of switching elements in the third switching cycle and the plurality of fourth switching cycles based on the results of operations performed in at least some of the plurality of second switching cycles.

[0157] The control unit can perform an operation in at least some of the plurality of fourth switching cycles based on the output current detected by the current sensor in the third switching cycle.

[0158]

[0159] The control unit can drive a plurality of switching elements in a third control cycle following the second control cycle based on the result of the operation performed in the second control cycle.

[0160] The sum of multiple switching cycles may be set to be longer than the operation cycle required for the operation.

[0161] A power conversion method according to one embodiment of the present disclosure comprises: a power conversion method using a plurality of switching elements, performing an operation for driving a plurality of switching elements in a first control period; and driving the plurality of switching elements based on a result of the operation in a second control period following the first control period; wherein each of the first control period and the second control period may include a plurality of switching periods.

[0162] Performing the operation in the first control period may include performing the operation based on output currents output from a plurality of switching elements in the first control period.

[0163] The first control cycle includes a first switching cycle and a plurality of second switching cycles, and performing an operation in the first control cycle may include performing an operation based on output currents output from a plurality of switching elements in the first switching cycle.

[0164] The first switching period may be longer than each of the plurality of second switching periods.

[0165] The starting point of the first switching cycle may be the same as the starting point of the first control cycle.

[0166] The center point of the first switching cycle may be the same as the center point of the first control cycle.

[0167] The second control cycle includes a third switching cycle and a plurality of fourth switching cycles, and driving the plurality of switching elements based on the result of the operation in the second control cycle may include driving the plurality of switching elements in the third switching cycle and the plurality of fourth switching cycles based on the result of the operation performed in at least some of the plurality of second switching cycles.

[0168] It may further include performing an operation in at least some of the plurality of fourth switching cycles based on output currents output from the plurality of switching elements in the third switching cycle.

[0169] In a third control cycle following the second control cycle, driving a plurality of switching elements based on the result of the operation performed in the second control cycle may be further included.

[0170] The sum of multiple switching cycles may be set to be longer than the operation cycle required for the operation.

[0171] Meanwhile, the disclosed embodiments may be implemented in the form of a recording medium storing computer-executable instructions. The instructions may be stored in the form of program code, and when executed by a processor, may generate program modules to perform the operations of the disclosed embodiments. The recording medium may be implemented as a computer-readable recording medium.

[0172] Computer-readable storage media include all types of storage media that store instructions that can be deciphered by a computer. Examples include read-only memory (ROM), random access memory (RAM), magnetic tape, magnetic disks, flash memory, and optical data storage devices.

[0173] Additionally, a computer-readable recording medium may be provided in the form of a non-transitory storage medium. Here, the term "non-transitory storage medium" simply means a tangible device that does not contain signals (e.g., electromagnetic waves). This term does not distinguish between cases where data is permanently stored in the storage medium and cases where data is temporarily stored. For example, a "non-transitory storage medium" may include a buffer in which data is temporarily stored.

[0174] According to one embodiment, the method according to various embodiments disclosed in the present document may be provided as included in a computer program product. The computer program product may be traded as a product between a seller and a buyer. The computer program product may be distributed in the form of a machine-readable recording medium (e.g., compact disc read only memory (CD-ROM)), or may be distributed online (e.g., downloaded or uploaded) via an application store (e.g., Play Store™) or directly between two user devices (e.g., smartphones). In the case of online distribution, at least a portion of the computer program product (e.g., a downloadable app) may be temporarily stored or temporarily generated on a machine-readable recording medium, such as the memory of a manufacturer's server, an application store's server, or an intermediary server.

[0175] The disclosed embodiments have been described with reference to the attached drawings as described above. Those skilled in the art will understand that the present invention can be implemented in forms other than the disclosed embodiments without altering the technical spirit or essential features of the present invention. The disclosed embodiments are illustrative and should not be construed as limiting.

Claims

1. A power conversion unit including a plurality of switching elements and performing a power conversion operation through the plurality of switching elements; and A power conversion system comprising: a control unit that performs a first operation for driving the plurality of switching elements in a first control period including a first plurality of switching periods, and drives the plurality of switching elements in a second control period including a second plurality of switching periods after the first control period based on a result of the first operation.

2. In paragraph 1, Further comprising a current sensor that detects an output current output from the power conversion unit and generates information about the output current; The above control unit, A power conversion system that performs at least a portion of the first operation based on the information generated by the current sensor in at least one switching cycle among the first plurality of switching cycles.

3. In paragraph 2, The first plurality of switching cycles includes a first switching cycle and a plurality of second switching cycles, The above control unit, A power conversion system that performs at least a portion of the first operation in the first control period, which includes at least a portion of the plurality of second switching periods, based on information generated by the current sensor in the first switching period.

4. In paragraph 3, A power conversion system wherein the first switching cycle is longer than each of the plurality of second switching cycles.

5. In paragraph 3, The starting point of the first switching cycle is A power conversion system having the same starting point as the first control cycle.

6. In paragraph 3, The center point of the above first switching cycle is, A power conversion system having the same central point as the first control cycle.

7. In paragraph 3, The second plurality of switching cycles includes a third switching cycle and a plurality of fourth switching cycles, The above control unit, A power conversion system that drives the plurality of switching elements in the second control period including the third switching period and the plurality of fourth switching periods based on the results of the first operation performed in at least some of the plurality of second switching periods.

8. In paragraph 7, The above control unit, A power conversion system that performs a second operation for driving the plurality of switching elements in the second control period including at least a portion of the plurality of fourth switching periods based on information generated by the current sensor in the third switching period.

9. In paragraph 8, The above control unit, A power conversion system that drives the plurality of switching elements based on the result of the second operation in a third control cycle following the second control cycle.

10. In paragraph 1, The sum of the durations of the first plurality of switching cycles is set to be longer than the first operation cycle required for the first operation, or A power conversion system, wherein the sum of the durations of the second plurality of switching cycles is set longer than the second operation cycle required for the second operation.

11. A power conversion method of a power conversion system including a power conversion unit that includes a plurality of switching elements and performs a power conversion operation through the plurality of switching elements, Performing a first operation for driving the plurality of switching elements in a first control cycle including a first plurality of switching cycles; A power conversion method comprising: driving the plurality of switching elements in a second control period including a second plurality of switching periods after the first control period, based on the result of the first operation.

12. In paragraph 11, The above power conversion system, Further comprising a current sensor that detects an output current output from the power conversion unit and generates information about the output current; Performing the above first operation is as follows: A power conversion method comprising: performing at least a part of the first operation based on the information generated by the current sensor in at least one switching cycle among the first plurality of switching cycles.

13. In paragraph 12, The first plurality of switching cycles includes a first switching cycle and a plurality of second switching cycles, Performing the above first operation is as follows: A power conversion method comprising: performing at least a part of the first operation in the first control period including at least a part of the plurality of second switching periods based on information generated by the current sensor in the first switching period.

14. In paragraph 13, A power conversion method wherein the first switching period is longer than each of the plurality of second switching periods.

15. In paragraph 13, The starting point of the first switching cycle is A power conversion method having the same starting point as the first control cycle.

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