Electronic device and control method therefor

Abstract

An electronic device and a control method therefor are disclosed. In particular, the electronic device may comprise: an inverter which includes a plurality of high-side switches, a plurality of low-side switches corresponding to each of the plurality of high-side switches, and a plurality of shunt resistors connected to each of the plurality of low-side switches, and which converts, into an alternating current voltage including three phases, an direct current voltage that is input; a memory for storing data related to control of the inverter; and a processor for controlling the inverter such that at least some of the plurality of high-side switches and the plurality of low-side switches are turned off on the basis of angles indicating the phases of the three phases. In addition, the processor can identify first sections in which a duty ratio is a maximum value or a minimum value in a plurality of first signals corresponding to the plurality of high-side switches, and second sections that differ from the first sections, limit the upper limit of the duty ratio of the second sections in each of the plurality of first signals to a preset first threshold value so as to acquire a plurality of second signals corresponding to each of the plurality of high-side switches, and control the plurality of high-side switches on the basis of the plurality of second signals.

Description

Electronic device and method of controlling the same

[0001] The present disclosure relates to an electronic device and a method for controlling the electronic device, and more particularly, to an electronic device capable of controlling an inverter and a method for controlling the same.

[0002] Pulse Width Modulation (PWM) plays a crucial role in electronic devices and control systems and is widely used in a variety of applications. PWM is a technique for controlling power transmission by modulating the duty ratio (or duty cycle) of a signal.

[0003] Among PWM techniques, 60-degree DPWM (Discontinuous Pulse Width Modulation) is a modulation technique that reduces switching losses by keeping one switch off for 60 electrical degrees during a specific cycle, and is widely used in inverter control.

[0004] However, when using the 60-degree DPWM technique, there is no problem if a current measuring element (or current sensor) such as a CT (Current Transformer) is used to measure the current flowing through the inverter, but a problem may occur if a shunt resistor is used.

[0005] In particular, when connecting a shunt resistor in series with the inverter's bottom switch, current measurement is limited to only while the bottom switch is on. Furthermore, if the time it takes for the bottom switch to turn on is too short, it is difficult to measure current while avoiding the high-frequency noise generated by the inverter's switching operation.

[0006] The present disclosure is intended to overcome the limitations of the prior art as described above, and an object of the present disclosure is to provide an electronic device and a control method thereof that can control an inverter without problems in measuring current even when an inverter including a shunt resistor is used.

[0007] According to one or more embodiments of the present disclosure for achieving the above-described object, an electronic device includes a plurality of upper switches, a plurality of lower switches corresponding to each of the plurality of upper switches, and a plurality of shunt resistors connected to each of the plurality of lower switches, an inverter for converting an input DC voltage into an AC voltage including three phases, a memory for storing data related to the control of the inverter, and a processor for controlling the inverter to turn off at least some of the plurality of upper switches and the plurality of lower switches based on an angle representing a phase of the three phases, wherein the processor identifies first sections in which a duty ratio is a maximum value or a minimum value and second sections different from the first sections in each of the plurality of first signals corresponding to each of the plurality of upper switches, and limits an upper limit of a duty ratio of the second sections in each of the plurality of first signals to a preset first threshold value, thereby obtaining a plurality of second signals corresponding to each of the plurality of upper switches, and controlling the plurality of upper switches based on the plurality of second signals.

[0008] Meanwhile, the processor can obtain a plurality of second signals corresponding to each of the plurality of upper switches by limiting the upper limit of the duty ratio of the second sections in each of the plurality of first signals to a first threshold value and limiting the lower limit of the duty ratio of the second sections to a preset second threshold value.

[0009] Meanwhile, the processor identifies third sections in which the duty ratio is a maximum or minimum value and fourth sections different from the third sections in each of the plurality of third signals corresponding to each of the plurality of lower switches, and limits the lower limit of the duty ratio of the fourth sections in each of the plurality of third signals to a preset third threshold value, thereby obtaining a plurality of fourth signals corresponding to each of the plurality of lower switches, and controlling the plurality of lower switches based on the plurality of fourth signals.

[0010] Meanwhile, the processor can obtain a plurality of fourth signals corresponding to each of the plurality of upper switches by limiting the lower end of the duty ratio of the fourth sections in each of the plurality of third signals to a third threshold value and limiting the upper end of the duty ratio of the fourth sections to a preset fourth threshold value.

[0011] Meanwhile, the processor may detect the current of the inverter using the shunt resistor by obtaining the current value of each of two phases among the three phases in a section in which the duty ratio of the plurality of first signals corresponding to the plurality of upper switches among the plurality of sections is the smallest, and obtaining the current value of the remaining phase among the three phases based on the current value of each of the two phases.

[0012] Meanwhile, the electronic device further includes a motor, and the processor controls the motor to turn on the plurality of lower switches to charge a voltage for opening and closing the plurality of upper switches, align a rotor included in the motor at an angle that does not correspond to sections in which a duty ratio of at least one first signal among the plurality of first signals is a maximum value, and when the rotor is aligned, the motor can be rotated by transmitting the AC voltage value to the motor.

[0013] Meanwhile, when the processor aligns the rotor by applying a Q-axis current (Quadrature Axis Current), the processor can control the motor to align the rotor included in the motor at an angle that does not correspond to an angle minus 90 degrees corresponding to the sections in which the duty ratio of the at least one first signal is the maximum value.

[0014] Meanwhile, the processor can control the inverter so that the plurality of upper switches are alternately turned off and the plurality of lower switches are alternately turned off whenever the angle representing the phase of the three phases increases by 60 degrees.

[0015] According to one or more embodiments of the present disclosure for achieving the above-described object, there is provided a control method for an electronic device including an inverter that converts an input DC voltage into an AC voltage including three phases, wherein the inverter includes a plurality of upper switches, a plurality of lower switches corresponding to each of the plurality of upper switches, and a plurality of shunt resistors connected to each of the plurality of lower switches, and the control method includes a step of identifying first sections in which a duty ratio is a maximum value or a minimum value and second sections different from the first sections in each of a plurality of first signals corresponding to each of the plurality of upper switches, a step of obtaining a plurality of second signals corresponding to each of the plurality of upper switches by limiting an upper limit of a duty ratio of the second sections in each of the plurality of first signals to a preset first threshold value, and a step of controlling the plurality of upper switches based on the plurality of second signals.

[0016] Meanwhile, the step of acquiring the second signals may include a step of acquiring a plurality of second signals corresponding to each of the plurality of upper switches by limiting an upper limit of a duty ratio of the second sections in each of the plurality of first signals to a first threshold value and limiting a lower limit of a duty ratio of the second sections to a preset second threshold value.

[0017] Meanwhile, the control method may further include a step of identifying third sections in which the duty ratio is a maximum or minimum value and fourth sections different from the third sections in each of the plurality of third signals corresponding to each of the plurality of lower switches, a step of obtaining a plurality of fourth signals corresponding to each of the plurality of lower switches by limiting a lower limit of the duty ratio of the fourth sections in each of the plurality of third signals to a preset third threshold value, and a step of controlling the plurality of lower switches based on the plurality of fourth signals.

[0018] Meanwhile, the step of obtaining the plurality of fourth signals may include a step of obtaining the plurality of fourth signals corresponding to each of the plurality of upper switches by limiting the lower end of the duty ratio of the fourth sections in each of the plurality of third signals to a third threshold value and limiting the upper end of the duty ratio of the fourth sections to a preset fourth threshold value.

[0019] Meanwhile, the control method may further include a step of detecting the current of the inverter using the shunt resistor by obtaining the current value of each of two phases among the three phases in a section in which the duty ratio of the plurality of first signals corresponding to the plurality of upper switches among the plurality of sections is the smallest, and obtaining the current value of the remaining phase among the three phases based on the current value of each of the two phases.

[0020] Meanwhile, the control method may include a step of turning on the plurality of lower switches to charge a voltage for opening and closing the plurality of upper switches, a step of aligning a rotor included in a motor of the electronic device at an angle that does not correspond to sections in which a duty ratio of at least one first signal among the plurality of first signals is a maximum value, and a step of rotating the motor by transmitting the AC voltage value to the motor when the rotor is aligned.

[0021] Meanwhile, the step of aligning the rotor included in the motor may include a step of aligning the rotor included in the motor at an angle that does not correspond to an angle minus 90 degrees corresponding to the sections in which the duty ratio of the at least one first signal is the maximum value when aligning the rotor by applying a Q-axis current (Quadrature Axis Current).

[0022] Meanwhile, the control method may further include a step of controlling the inverter so that the plurality of upper switches are alternately turned off and the plurality of lower switches are alternately turned off whenever the angle representing the phase of the three phases increases by 60 degrees.

[0023] Other aspects, features and advantages of one or more embodiments according to the present disclosure will become more apparent from the following detailed description taken in conjunction with the accompanying drawings.

[0024] FIG. 1 is a block diagram illustrating a configuration of an electronic device according to one or more embodiments;

[0025] FIG. 2 is a schematic diagram illustrating the structure of an inverter according to one or more embodiments of the present disclosure;

[0026] Figure 3 is a graph showing the duty ratio of a signal when the upper and lower limits of the pulse width of the signal are not limited according to the prior art.

[0027] Figure 4 is a graph showing the duty ratio of a signal when the upper and lower limits of the pulse width of the signal are limited.

[0028] Figure 5 is a drawing for explaining limiting the upper and lower limits of the pulse width of a signal for each of multiple sections.

[0029] FIG. 6 is a diagram illustrating one or more embodiments of detecting current using a shunt resistor in an inverter;

[0030] FIG. 7 is a block diagram illustrating a configuration of an electronic device including a motor according to one or more embodiments; and

[0031] FIG. 8 is a flowchart illustrating a method of controlling an electronic device according to one or more embodiments.

[0032] The present embodiments may be modified and have various embodiments. Specific embodiments are illustrated in the drawings and described in detail in the detailed description. However, this is not intended to limit the scope to specific embodiments, but should be understood to encompass various modifications, equivalents, and / or alternatives of the embodiments of the present disclosure. In connection with the description of the drawings, similar reference numerals may be used for similar components.

[0033] In describing the present disclosure, if it is determined that a specific description of a related known function or configuration may unnecessarily obscure the gist of the present disclosure, a detailed description thereof will be omitted.

[0034] Additionally, the following embodiments may be modified in various other forms, and the scope of the technical concepts of the present disclosure is not limited to the following embodiments. Rather, these embodiments are provided to further faithfully and completely convey the technical concepts of the present disclosure to those skilled in the art.

[0035] The terminology used in this disclosure is for the purpose of describing specific embodiments only and is not intended to limit the scope of the rights. Singular expressions include plural expressions unless the context clearly dictates otherwise.

[0036] In this disclosure, expressions such as “has,” “can have,” “includes,” or “may include” indicate the presence of a corresponding feature (e.g., a component such as a number, function, operation, or part), and do not exclude the presence of additional features.

[0037] In this disclosure, expressions such as “A or B,” “at least one of A and / or B,” or “one or more of A or / and B” can include all possible combinations of the listed items. For example, “A or B,” “at least one of A and B,” or “at least one of A or B” can all refer to (1) including at least one A, (2) including at least one B, or (3) including both at least one A and at least one B.

[0038] The expressions “first,” “second,” “first,” or “second,” etc., used in this disclosure can describe various components, regardless of order and / or importance, and are only used to distinguish one component from another, but do not limit the components.

[0039] When it is said that a component (e.g., a first component) is “(operatively or communicatively) coupled with / to” or “connected to” another component (e.g., a second component), it should be understood that said component may be directly coupled to said other component, or may be coupled via another component (e.g., a third component).

[0040] On the other hand, when it is said that a component (e.g., a first component) is "directly connected" or "directly connected" to another component (e.g., a second component), it can be understood that no other component (e.g., a third component) exists between said component and said other component.

[0041] The expression "configured to" as used in the present disclosure may be used interchangeably with, for example, "suitable for," "having the capacity to," "designed to," "adapted to," "made to," or "capable of." The term "configured to" may not necessarily mean only "specifically designed to" in terms of hardware.

[0042] Instead, in some contexts, the phrase "a device configured to" may mean that the device, in conjunction with other devices or components, is "capable of" performing A, B, and C. For example, the phrase "a processor configured (or set) to perform A, B, and C" may refer to a dedicated processor (e.g., an embedded processor) for performing those operations, or a general-purpose processor (e.g., a CPU or application processor) that can perform those operations by executing one or more software programs stored in a memory device.

[0043] In the embodiments, a 'module' or 'part' performs at least one function or operation, and may be implemented as hardware or software, or as a combination of hardware and software. Furthermore, a plurality of 'modules' or 'parts' may be integrated into at least one module and implemented as at least one processor, except for a 'module' or 'part' that needs to be implemented as a specific hardware.

[0044] Meanwhile, the various elements and areas in the drawings are schematically drawn. Therefore, the technical concept of the present invention is not limited by the relative sizes or spacing depicted in the attached drawings.

[0045] Hereinafter, with reference to the attached drawings, embodiments according to the present disclosure will be described in detail so that a person having ordinary knowledge in the technical field to which the present disclosure pertains can easily implement the present disclosure.

[0046] FIG. 1 is a block diagram showing the configuration of an electronic device according to one or more embodiments, and FIG. 2 is a diagram briefly showing the structure of an inverter according to one or more embodiments of the present disclosure.

[0047] An electronic device (100) refers to a device capable of controlling an inverter (110). For example, the electronic device (100) may be a home appliance such as a washing machine, an air conditioner, a refrigerator, or the like, and may also be an electric vehicle, an industrial robot, or the like. However, there is no particular limitation on the type of the electronic device (100) according to the present disclosure, and any device capable of generating a signal (e.g., a pulse width modulation signal) capable of controlling the inverter (110) and controlling the inverter (110) based on the generated signal may correspond to the electronic device (100) according to the present disclosure, regardless of its type.

[0048] As illustrated in FIG. 1, the electronic device (100) may include an inverter (110), a memory (120), and a processor (130).

[0049] The inverter (110) can convert direct current power into alternating current power. Specifically, the inverter (110) can convert the input direct current voltage into an alternating current voltage comprising three phases. Here, the alternating current voltage comprising three phases is referred to as a "three-phase voltage," and each of the three phases can provide a continuous flow of power while supplying voltage at a phase interval of 120 degrees.

[0050] As illustrated in FIG. 2, the inverter (110) may include a plurality of upper switches (111), a plurality of lower switches (112), and a plurality of shunt resistors (113). Among the components of the inverter (110) illustrated in FIG. 2, the AC power source, rectifier, etc. correspond to the general components of the inverter (110), and therefore, a description thereof will be omitted.

[0051] A plurality of upper switches (111) and a plurality of lower switches (112) refer to switching elements included in an inverter (110). The plurality of upper switches (111) and the plurality of lower switches (112) can form a change in AC voltage by switching alternately.

[0052] As illustrated in Fig. 2, a plurality of upper switches (111) are positioned at the upper end of the inverter (110) circuit and can be connected to the (+) terminal of the upper end of the DC power source. When the plurality of upper switches (111) are turned on, current can flow from the upper end of the DC power source to the plurality of lower switches (112), and when the plurality of upper switches (111) are turned off, the flow of current from the upper end of the DC power source can be blocked.

[0053] As illustrated in FIG. 2, a plurality of lower switches (112) are positioned at the bottom of the inverter (110) circuit and can be connected to the (-) terminal of the lower DC power source. When the plurality of lower switches (112) are turned on, current can flow from the lower end of the DC power source to the plurality of lower switches (112), and when the plurality of lower switches are turned off, the flow of current from the lower end of the DC power source can be blocked.

[0054] The plurality of upper switches (111) may correspond to each of the three phases representing the alternating voltage. For example, the plurality of upper switches (111) may be three switches including a first upper switch (111) corresponding to the first phase (a), a second upper switch (111) corresponding to the second phase (b), and a third upper switch (111) corresponding to the third phase (c).

[0055] The plurality of lower switches (112) may correspond to each of the three phases representing the alternating voltage. For example, the plurality of lower switches (112) may be three switches including a first lower switch (112) corresponding to a first phase (a), a second lower switch (112) corresponding to a second phase (b), and a third lower switch (112) corresponding to a third phase (c).

[0056] Each of the plurality of upper switches (111) and each of the plurality of lower switches (112) may correspond to each other. Specifically, the plurality of upper switches (111) and the plurality of lower switches (112) may correspond to each other only if the corresponding switches have the same phase.

[0057] In the above-described example, the first upper switch (111) may correspond to the first lower switch (112) and may be used to control the voltage of the first phase (a). The second upper switch (111) corresponding to the second phase (b) may correspond to the second lower switch (112) corresponding to the second phase (b) and may be used to control the voltage of the second phase (b). The third upper switch (111) corresponding to the third phase (c) may correspond to the third lower switch (112) corresponding to the third phase (c) and may be used to control the voltage of the third phase (c).

[0058] A pair of switches including an upper switch (111) and a lower switch (112) that correspond to each other can be used to control the voltage of one of the three phases. For example, a plurality of upper switches (111) and a plurality of lower switches (112) can determine the frequency and amplitude of the AC voltage by operating in such a manner that when the upper switch (111) is turned on, the lower switch (112) is turned off, and when the upper switch (111) is turned off, the lower switch (112) is turned on.

[0059] A plurality of shunt resistors (113) refer to resistors that are connected in series to a circuit to measure current. Specifically, the processor (130) can measure the current flowing through the inverter (110) by using the shunt resistor (113) to measure the voltage drop that occurs when the current flowing through the inverter (110) passes through the shunt resistor (113).

[0060] As illustrated in FIG. 2, a plurality of shunt resistors (113) may be connected to each of a plurality of lower switches (112), and the processor (130) may measure a current flowing through each of the plurality of lower switches (112) using the plurality of shunt resistors (113). For example, the plurality of shunt resistors (113) may include a first shunt resistor (113) corresponding to a first phase (a), a second shunt resistor (113) corresponding to a second phase (b), and a third shunt resistor (113) corresponding to a third phase (c). In addition, the first shunt resistor (113) may be connected in series to the first lower switch (112), the second shunt resistor (113) may be connected in series to the second lower switch (112), and the third shunt resistor (113) may be connected in series to the third lower switch (112).

[0061] Although FIG. 2 exemplarily illustrates the structure of an inverter (110) including three upper switches (111), three lower switches (112) corresponding to each of the three upper switches (111), and three shunt resistors (113) corresponding to each of the three lower switches (112), the present disclosure is not limited thereto. That is, within the scope that does not limit the implementation of various embodiments according to the present disclosure, the number and arrangement of the plurality of upper switches (111), the plurality of lower switches (112), and the plurality of shunt resistors (113) may be implemented differently from those illustrated in FIG. 2.

[0062] In the description of the present disclosure, it will be explained on the premise that the current flowing in the inverter (110) is measured using a shunt resistor (113), but if the current flowing in the inverter (110) is measured using a resistor connected in series to each of the plurality of lower switches (112) of the inverter (110), embodiments according to the present disclosure may also be applied when a current measuring device or current sensor of a different type than the shunt resistor (113) is used.

[0063] At least one instruction regarding the electronic device (100) may be stored in the memory (120). In addition, an O / S (Operating System) for driving the electronic device (100) may be stored in the memory (120). In addition, various software programs or applications for operating the electronic device (100) according to various embodiments of the present disclosure may be stored in the memory (120). In addition, the memory (120) may include a semiconductor memory such as a flash memory or a magnetic storage medium such as a hard disk.

[0064] Specifically, the memory (120) may store various software modules for operating the electronic device (100) according to various embodiments of the present disclosure, and the processor (130) may control the operation of the electronic device (100) by executing the various software modules stored in the memory (120). That is, the memory (120) is accessed by the processor (130), and data reading / recording / modifying / deleting / updating, etc. may be performed by the processor (130).

[0065] Meanwhile, in the present disclosure, the term memory (120) may be used to mean a memory (120), a ROM, a RAM in a processor (130), or a memory card (e.g., a micro SD card, a memory stick) mounted in an electronic device (100).

[0066] In one or more embodiments, the memory (120) may store data related to the control of the inverter (110). For example, the memory (120) may store information about a DC voltage input to the inverter (110), an AC voltage output by the inverter (110), a control signal for controlling the inverter (110) (e.g., a pulse width modulation signal such as a first signal, a second signal, a third signal, and a fourth signal), information related to DPWM (Discontinuous Pulse Width Modulation), and the like. In addition, various information necessary within the scope of achieving the purpose of the present disclosure may be stored in the memory (120), and the information stored in the memory (120) may be updated as received from an external device or input by a user.

[0067] The processor (130) controls the overall operation of the electronic device (100). Specifically, the processor (130) is connected to the configuration of the electronic device (100) including the inverter (110) and the memory (120), and can control the overall operation of the electronic device (100) by executing at least one instruction stored in the memory (120) as described above.

[0068] The processor (130) may be implemented in various ways. For example, the processor (130) may be implemented as at least one of an application-specific integrated circuit (ASIC), an embedded processor, a microprocessor, hardware control logic, a hardware finite state machine (FSM), and a digital signal processor (DSP). Meanwhile, the term "processor (130)" in the present disclosure may be used to mean a central processing unit (CPU), a graphic processing unit (GPU), and a microprocessor unit (MPU).

[0069] The processor (130) can perform PWM (Pulse Width Modulation) control. Here, PWM refers to a technology for controlling power transmission by modulating the duty ratio (or duty cycle) of a signal. Specifically, the processor (130) can obtain a modulated signal by adjusting the width of each pulse in a pulse signal of a constant cycle, and control the inverter (110) based on the modulated signal.

[0070] The processor (130) can perform 60-degree DPWM (Discontinuous Pulse Width Modulation) control. Here, 60-degree DPWM refers to a modulation technique that reduces switching losses by keeping one switch off for 60 electrical degrees during a specific cycle. Performing 60-degree DPWM can lower the switching frequency and improve the efficiency of power conversion.

[0071] The processor (130) can control the inverter (110) to turn off at least some of the plurality of upper switches (111) and the plurality of lower switches (112) based on the angles representing the phases of the three phases.

[0072] Specifically, the processor (130) can control the inverter (110) so that the plurality of upper switches (111) are alternately turned off and the plurality of lower switches (112) are alternately turned off whenever the angle representing the phase of the three phases increases by 60 degrees. That is, the processor (130) can perform the 60-degree DPWM as described above. Hereinafter, various embodiments will be described on the premise that the processor (130) according to the present disclosure performs the 60-degree DPWM, but the present disclosure is not limited thereto.

[0073] In one or more embodiments, the processor (130) may identify first intervals in which the duty ratio is a maximum or minimum value and second intervals that are different from the first intervals in each of the plurality of first signals corresponding to each of the plurality of upper switches (111).

[0074] Here, the 'first signal' refers to a signal resulting from performing 60-degree DPWM (discontinuous pulse width modulation). The processor can obtain the first signal by modulating the pulse width of a reference signal, which is a low-frequency sine wave signal, based on a carrier signal, which is a high-frequency triangular wave signal.

[0075] A duty ratio of the first signal (i.e., pulse width of the signal divided by the period of the signal) of a maximum value (i.e., 100%) may mean that the switch to be controlled by the first signal is completely turned on during the corresponding period. In addition, a duty ratio of the first signal of a minimum value (i.e., 0%) may mean that the switch to be controlled by the first signal is completely turned off during the corresponding period.

[0076] The plurality of first signals refers to signals for controlling each of the plurality of upper switches (111). When the plurality of upper switches (111) include a first upper switch (111) corresponding to the first phase (a), a second upper switch (111) corresponding to the second phase (b), and a third upper switch (111) corresponding to the third phase (c), the plurality of first signals may include three signals corresponding to the first phase (a), the second phase (b), and the third phase (c).

[0077] The processor (130) can analyze each of a plurality of first signals corresponding to the first phase (a), the second phase (b), and the third phase (c), and identify sections in which the switches corresponding to each of the plurality of first signals are completely turned on and completely turned off as first sections, and as a result, identify sections remaining except for the sections in which the switches are completely turned on and completely turned off as second sections.

[0078] The processor (130) can obtain a plurality of second signals corresponding to each of the plurality of upper switches (111) by limiting the upper limit of the duty ratio of the second sections of each of the plurality of first signals to a preset first threshold value. In addition, the processor (130) can control the plurality of upper switches (111) based on the plurality of second signals.

[0079] As illustrated in Fig. 2, when measuring current using a shunt resistor (113) connected in series to the lower switch (112), there is a limitation that the current can only be measured while the lower switch (112) is turned on. For example, if the duty ratio of the signal corresponding to the first upper switch (111) is too large, the duty ratio of the signal corresponding to the first lower switch (112) corresponding to the first upper switch (111) becomes too small, making it difficult to measure current using the shunt resistor (113) connected in series to the lower switch (112).

[0080] In particular, if the pulse width of the signal corresponding to the lower switch (112) is too narrow, it may become difficult to measure the current by avoiding a section where high-frequency noise occurs according to the switching operation of the inverter (110). Therefore, for the signal corresponding to the lower switch (112), a lower limit for the duty ratio per section needs to be set, which means that for the signal corresponding to the upper switch (111), an upper limit for the duty ratio per section needs to be set.

[0081] Accordingly, the processor (130) can obtain the second signal by limiting the upper limit of the duty ratio of the second sections, which are sections excluding the sections in which the corresponding upper switch (111) is completely turned on and completely turned off, to the first threshold value based on each of the plurality of first signals. Here, the 'second signal' refers to a signal obtained by limiting the upper limit and / or lower limit of the pulse width of the first signal. The first threshold value can be changed according to the settings of the developer or user, and can be, for example, 80% of the maximum value of the duty ratio.

[0082] Meanwhile, the processor (130) may not limit the upper limit of the duty ratio of the section in which the corresponding upper switch (111) is completely turned on and completely turned off based on each of the plurality of first signals. This is because, in order to perform switching according to the 60-degree DPWM as described above, the section in which the upper switch (111) is completely turned on and completely turned off needs to be guaranteed.

[0083] According to the embodiments described above, the electronic device (100) can effectively and efficiently control the inverter (110) without any problem in measuring current even when using the inverter (110) including the shunt resistor (113). Specifically, the electronic device (100) does not limit the upper limit of the duty ratio in the section where the upper switch (111) is completely turned on and completely turned off, thereby ensuring the efficiency of power conversion according to the 60-degree DPWM, while limiting the upper limit of the duty ratio of the signal corresponding to the upper switch (111), thereby enabling the current flowing in the inverter (110) to be effectively and accurately measured using the shunt resistor (113) connected in series to the lower switch (112).

[0084] More specific examples of limiting the duty ratio (or pulse width) of signals corresponding to each of the plurality of upper switches (111) and the plurality of lower switches (112) will be described with reference to FIGS. 3 to 5.

[0085] Fig. 3 is a graph showing the duty ratio of a signal when the upper and lower limits of the pulse width of the signal are not limited according to the prior art, and Fig. 4 is a graph showing the duty ratio of a signal when the upper and lower limits of the pulse width of the signal are limited. In addition, Fig. 5 is a drawing for explaining limiting the upper and lower limits of the pulse width of the signal for each of a plurality of sections.

[0086] In the above, an embodiment related to limiting the upper limit of the duty ratio of the signal corresponding to the upper switch (111) has been described, but the processor (130) may also limit the lower limit together with the upper limit of the duty ratio of the signal corresponding to the upper switch (111).

[0087] In one or more embodiments, the processor (130) may obtain a plurality of second signals corresponding to each of the plurality of upper switches (111) by limiting an upper limit of a duty ratio of second sections in each of the plurality of first signals to a first threshold value and limiting a lower limit of a duty ratio of second sections to a preset second threshold value. Here, the second threshold value may be changed according to a developer's or user's setting, and may be, for example, 20% of the maximum value of the duty ratio.

[0088] First, reference is made to Fig. 3, which illustrates the results of performing a 60-degree DPWM according to the prior art. Specifically, the graph in Fig. 3 represents the results of calculating the duty ratio assuming that the three-phase voltage is 30% of Vdc / root(3). Since the signal in Fig. 3 is a signal before the upper and lower limits of the pulse width of the signal are limited according to the present disclosure, it can be referred to as the first signal defined above.

[0089] In Fig. 3, the horizontal axis represents the angle during one cycle of the signal, and the vertical axis represents the duty ratio of the three first signals of each of the three upper switches (111) and the three phases (A phase, B phase, and C phase). This representation can be similarly applied to Figs. 4 and 8.

[0090] In Fig. 3, section S1 represents the first section in which the duty ratio of the first signal is the maximum value, section S2 represents the first section in which the duty ratio of the first signal is the minimum value, and sections S3 and S4 represent the second section as sections in which the duty ratio of the first signal changes and are not the first section.

[0091] Referring to Fig. 4, which shows the result of limiting the upper and lower limits of the pulse width of the corresponding signal based on the upper switch (111), it can be seen that the duty ratio of the signal is not limited in the first section, section S1 and section S2, whereas the upper limit of the duty ratio of the first signal is limited in the second section, section S3, and the lower limit of the duty ratio of the first signal is limited in the second section, section S4. Since the signal of Fig. 4 is a signal after limiting the upper and lower limits of the pulse width of the signal according to the present disclosure, it can be said to be the second signal defined above.

[0092] FIG. 5 is a table showing the results for multiple sections divided into 30-degree units along the horizontal axis in the graph of FIG. 4. Referring to FIG. 5, in the first section, since the upper switch (111) corresponding to phase A is completely turned on, the upper limit of the duty ratio of the signal corresponding to phase A is not limited, and the upper limit of the duty ratio of the signals corresponding to phases B and C can be limited to 80% of the maximum value. In the second and third sections, since the upper switch (111) corresponding to phase C is completely turned off, the lower limit of the duty ratio of the signal corresponding to phase C is not limited, and the lower limit of the duty ratio of the signals corresponding to phases A and B can be limited to 20% of the maximum value. In the fourth and fifth sections, since the upper switch (111) corresponding to phase B is completely turned on, the upper limit of the duty ratio of the signal corresponding to phase B is not limited, and the upper limit of the duty ratio of the signals corresponding to phases A and C can be limited to 80% of the maximum value. The description of the remaining sections is omitted as it is essentially a duplicate description of the same content.

[0093] Meanwhile, although the above has described an embodiment of limiting the upper limit of the duty ratio of the signal corresponding to the upper switch (111), the above-described embodiments can be similarly applied to the lower switch (112). However, since the upper switch (111) and the corresponding lower switch (112) operate in opposite directions, the lower limit, not the upper limit, of the duty ratio of the signal corresponding to the lower switch (112) may be limited. In addition, the upper limit may be limited together with the lower limit of the duty ratio of the signal corresponding to the lower switch (112).

[0094] In one or more embodiments, the processor (130) may identify third intervals in which the duty ratio is a maximum or minimum value in each of the plurality of third signals corresponding to each of the plurality of lower switches (112), and fourth intervals that are different from the third intervals. Once the third intervals and the fourth intervals are identified, the processor (130) may obtain a plurality of fourth signals corresponding to each of the plurality of lower switches (112) by limiting the lower limit of the duty ratio of the fourth intervals in each of the plurality of third signals to a preset third threshold value. Then, the processor (130) may control the plurality of lower switches (112) based on the plurality of fourth signals. Here, the third threshold value may be changed according to a setting of a developer or a user, and in particular, may be set to the same value as the first threshold value. For example, the third threshold value may be 80% of the maximum value of the duty ratio.

[0095] In one or more embodiments, the processor (130) may obtain a plurality of fourth signals corresponding to each of the plurality of upper switches (111) by limiting the lower end of the duty ratio of the fourth sections of each of the plurality of third signals to a third threshold value and limiting the upper end of the duty ratio of the fourth sections to a preset fourth threshold value. Here, the fourth threshold value may be changed according to a developer's or user's setting, and in particular, may be set to the same value as the second threshold value. For example, the fourth threshold value may be 20% of the maximum value of the duty ratio.

[0096] Since the lower switch (112) operates in the opposite direction to the corresponding upper switch (111), the explanations made with reference to FIGS. 3 to 5 can also be applied to cases where the upper limit is limited together with the lower limit of the duty ratio of the signal corresponding to the lower switch (112).

[0097] Meanwhile, for the purpose of measuring only the current, it is sufficient to control the duty ratio of the signal corresponding to the lower switch (112) to a level sufficient for measuring the current by limiting the upper limit of the duty ratio of the signal corresponding to the upper switch (111) and limiting the lower limit of the duty ratio of the signal corresponding to the lower switch (112). However, if only the upper limit of the duty ratio of the signal corresponding to the upper switch (111) is limited in this way, asymmetry of the current may occur, causing the current waveform to be distorted.

[0098] Therefore, by limiting the upper and lower limits of the duty ratio of the signal corresponding to the upper switch (111) together as in the embodiment described above with reference to FIGS. 3 to 5, or limiting the upper and lower limits of the duty ratio of the signal corresponding to the lower switch (112) together, the 60-degree DPWM control method can be implemented more effectively in a current measurement circuit including a shunt resistor (113) while minimizing distortion of the current waveform.

[0099] FIG. 6 is a diagram illustrating one or more embodiments of detecting current using a shunt resistor in an inverter.

[0100] It may be desirable to perform current measurement (or current detection) of the inverter (110) in a section where noise due to switching of the inverter (110) is the least. Therefore, in the case of an inverter (110) in which a shunt resistor (113) is connected in series with a lower switch (112), it may be desirable to perform current measurement in a section where the duty ratio of the signal corresponding to the lower switch (112) is large.

[0101] Meanwhile, since the duty ratio of the signal corresponding to the lower switch (112) is larger, the duty ratio of the signal corresponding to the upper switch (111) is smaller, so it may be desirable to perform current measurement in a section where the duty ratio of the signal corresponding to the upper switch (111) is small. For convenience of explanation, the following description will be based on the upper switch (111).

[0102] In one or more embodiments, the processor (130) may obtain the current values ​​of two phases among three phases in a section in which the duty ratios of the plurality of first signals corresponding to the plurality of upper switches (111) among the plurality of sections are the smallest. Then, the processor (130) may detect the current of the inverter (110) using the shunt resistor (113) by obtaining the current values ​​of the remaining phases among the three phases based on the current values ​​of the two phases.

[0103] FIG. 6 illustrates a method for measuring current for each of a plurality of sections when a plurality of upper switches (111) are controlled based on a plurality of first signals as illustrated in FIG. 3 or a plurality of second signals as illustrated in FIG. 4.

[0104] Referring to FIG. 6, in the first and second sections, since the duty ratio of the signal corresponding to phase A is greater than the duty ratio of the signal corresponding to phase B and the duty ratio of the signal corresponding to phase C, the processor (130) can measure the current of phase B and the current of phase C. Since the sum of the three-phase currents is always 0 (zero), the current of phase A can be calculated based on the current of phase B and the current of phase C. In the third and fourth sections, since the duty ratio of the signal corresponding to phase B is greater than the duty ratio of the signal corresponding to phase A and the duty ratio of the signal corresponding to phase C, the processor (130) can measure the current of phase A and the current of phase C, and can calculate the current of phase B based thereon. The description of the remaining sections is omitted because it is a duplicate description of virtually the same content.

[0105] According to the embodiment described above with reference to FIG. 6, even when measuring current using a shunt resistor (113) connected in series to the lower switch (112), it is possible to measure the current of the inverter (110) while minimizing the influence of noise due to switching of the inverter (110).

[0106] FIG. 7 is a block diagram illustrating a configuration of an electronic device including a motor according to one or more embodiments.

[0107] As illustrated in FIG. 7, the electronic device (100) may further include a motor (140) as well as an inverter (110), a memory (120), and a processor (130). However, the configurations illustrated in FIGS. 1 and 7 are merely exemplary, and it is to be understood that new configurations may be added or some configurations may be omitted in addition to the configurations illustrated in FIGS. 1 and 7 when implementing the present disclosure.

[0108] The motor (140) can convert electrical energy into mechanical energy to generate rotational motion or linear motion. For example, the motor (140) can be implemented as various types of motors (140) such as a DC (Direct Current) motor (140), an AC (Alternative Current) motor (140), and a BLDC (Brushless DC) motor (140), and the present disclosure is not limited to a specific type of motor (140). Specifically, when a DC power source such as a battery or rectified power source is input to the inverter (110), the inverter (110) can convert the DC power source into AC power under the control of the processor (130) and provide AC power to the motor (140), thereby driving the motor (140).

[0109] The motor (140) may include a stator and a rotor. Here, the stator is a fixed part of the motor (140) and may serve to form a magnetic field. The rotor is a rotating part of the motor (140) and may interact with the magnetic field of the stator to generate rotational motion.

[0110] In the above, embodiments for limiting the duty ratio of signals for multiple upper switches (111) or multiple lower switches (112), embodiments for current measurement, etc. have been described, but even when driving a motor (140), it is necessary to consider the section according to the duty ratio of the signal. However, the processor (130) can perform a process of charging voltage for opening and closing multiple upper switches (111) and a process of aligning the motor (140) prior to driving the motor (140).

[0111] Specifically, the processor (130) can turn on a plurality of lower switches (112) to charge voltage for opening and closing a plurality of upper switches (111). When the inverter (110) according to the present disclosure has a structure as shown in FIG. 2, the processor (130) can immediately turn on or off a plurality of lower switches (112) because they are connected to a gate voltage, but cannot turn on or off a plurality of upper switches (111) without charging because they are not connected to a gate voltage.

[0112] Accordingly, the inverter (110) may include a separate circuit (so-called bootstrap circuit) for charging the voltage for the plurality of upper switches (111), and if the inverter (110) includes such a separate circuit, it is possible to charge the voltage for the plurality of upper switches (111) (i.e., bootstrap charging) while the plurality of lower switches (112) are turned on.

[0113] However, when performing alignment of the bootstrap charging motor (140), if an angle at which even one of the plurality of upper switches (111) is fully turned on is used, a problem may arise in which the voltage charged for opening and closing the plurality of upper switches (111) is discharged during the alignment section of the motor (140).

[0114] Accordingly, according to one or more embodiments, the processor (130) may control the motor (140) to align the rotor included in the motor (140) at an angle that does not correspond to sections in which the duty ratio of at least one first signal among the plurality of first signals is at a maximum value. Then, when the rotor is aligned, the processor (130) may rotate the motor (140) by transmitting an AC voltage value to the motor (140). For example, in the examples of FIGS. 4 and 5, the processor (130) may avoid electrical angles of 330 to 30 degrees, 90 to 150 degrees, and 210 to 270 degrees, and may control the motor (140) to align at angles other than these.

[0115] Meanwhile, the above angle is based on the assumption that the motor (140) is aligned using the D-axis current, and in controlling the motor (140), the D-axis current (direct axis current) or the Q-axis current (quadrature axis current) can be used. Here, the D-axis current refers to a current flowing in the direction of the axis parallel to the magnetic flux of the rotor in the rotating coordinate system, and the Q-axis current refers to a current flowing in the direction orthogonal to the magnetic flux of the rotor in the rotating coordinate system. That is, in the case of aligning the motor (140) using the Q-axis current, a current with a phase that is 90 degrees ahead is applied.

[0116] Accordingly, when aligning the rotor by applying the Q-axis current, the processor (130) can control the motor (140) to align the rotor included in the motor (140) at an angle that does not correspond to an angle minus 90 degrees corresponding to the sections in which the duty ratio of at least one first signal among the plurality of first signals is the maximum value. For example, in the examples of FIGS. 4 and 5, when aligning the motor (140) using the Q-axis current, the processor (130) can control the motor (140) to avoid electrical angles in sections minus 90 degrees from the avoidance angles of 330 to 30 degrees, 90 to 150 degrees, and 210 to 270 degrees, and align at an angle other than these.

[0117] According to the embodiments described with reference to FIG. 7, the electronic device (100) can prevent discharge of the voltage charged for the upper switch (111) by avoiding a section where the duty ratio is at its maximum value even in one phase when aligning the motor (140), and as a result, it can perform stable 60-degree DWPM control using the inverter (110) in which the shunt resistor (113) is connected in series to the lower switch (112).

[0118] FIG. 8 is a flowchart illustrating a method of controlling an electronic device according to one or more embodiments.

[0119] An electronic device (100) may include an inverter (110) that converts an input DC voltage into an AC voltage including three phases. In addition, the inverter (110) may include a plurality of upper switches (111), a plurality of lower switches (112) corresponding to each of the plurality of upper switches (111), and a plurality of shunt resistors (113) connected to each of the plurality of lower switches (112).

[0120] Additionally, the electronic device (100) can perform 60-degree DPWM (Discontinuous Pulse Width Modulation) control. Specifically, the electronic device (100) can control the inverter (110) so that each time the angle representing the phase of the three phases increases by 60 degrees, the plurality of upper switches (111) are alternately turned off and each plurality of lower switches (112) are alternately turned off.

[0121] Referring to FIG. 8, the electronic device (100) can identify first sections in which the duty ratio is a maximum or minimum value and second sections that are different from the first sections in each of the plurality of first signals corresponding to each of the plurality of upper switches (111) included in the inverter (110) (S810).

[0122] Specifically, the electronic device (100) can analyze each of a plurality of first signals corresponding to each of the first phase, the second phase, and the third phase constituting the three-phase voltage, and identify a section in which a switch corresponding to each of the plurality of first signals is completely turned on and a section in which it is completely turned off as first sections, and as a result, identify the remaining sections excluding the section in which the switch is completely turned on and the section in which it is completely turned off as second sections.

[0123] The electronic device (100) can obtain a plurality of second signals corresponding to each of the plurality of upper switches (111) by limiting the upper limit of the duty ratio of the second sections in each of the plurality of first signals to a preset first threshold value (S820). Then, the electronic device (100) can control the plurality of upper switches (111) based on the plurality of second signals (S830). In other words, the electronic device (100) can limit the upper limit of the duty ratio of the second sections, which are sections remaining except for the sections in which the upper switch (111) corresponding to each of the plurality of first signals is completely turned on and completely turned off, to the first threshold value based on each of the plurality of first signals.

[0124] In one or more embodiments, the electronic device (100) may obtain a plurality of second signals corresponding to each of the plurality of upper switches (111) by limiting an upper limit of a duty ratio of second sections in each of the plurality of first signals to a first threshold value and limiting a lower limit of a duty ratio of second sections to a preset second threshold value.

[0125] In one or more embodiments, the electronic device (100) may identify third intervals in which the duty ratio is a maximum or minimum value and fourth intervals that are different from the third intervals in each of the plurality of third signals corresponding to each of the plurality of lower switches (112). Once the third intervals and the fourth intervals are identified, the electronic device (100) may obtain a plurality of fourth signals corresponding to each of the plurality of lower switches (112) by limiting a lower limit of the duty ratio of the fourth intervals in each of the plurality of third signals to a preset third threshold value. Then, the electronic device (100) may control the plurality of lower switches (112) based on the plurality of fourth signals.

[0126] In one or more embodiments, the electronic device (100) may obtain a plurality of fourth signals corresponding to each of the plurality of upper switches (111) by limiting the lower end of the duty ratio of the fourth sections in each of the plurality of third signals to a third threshold value and limiting the upper end of the duty ratio of the fourth sections to a preset fourth threshold value.

[0127] Meanwhile, the control method of the electronic device (100) according to the above-described embodiment may be implemented as a program and provided to the electronic device (100). In particular, the program including the control method of the electronic device (100) may be stored and provided in a non-transitory computer readable medium.

[0128] Specifically, in a non-transitory computer-readable recording medium including a program for executing a control method of an electronic device (100), the control method of the electronic device (100) may include a step of identifying first sections in which a duty ratio is a maximum value or a minimum value and second sections different from the first sections in each of a plurality of first signals corresponding to each of a plurality of upper switches (111), a step of obtaining a plurality of second signals corresponding to each of the plurality of upper switches (111) by limiting an upper limit of a duty ratio of the second sections in each of the plurality of first signals to a preset first threshold value, and a step of controlling the plurality of upper switches (111) based on the plurality of second signals.

[0129] In the above, a method for controlling an electronic device (100) and a computer-readable recording medium including a program for executing the method for controlling an electronic device (100) have been briefly described, but this is only to omit redundant descriptions, and it goes without saying that various embodiments of the electronic device (100) can also be applied to a method for controlling an electronic device (100) and a computer-readable recording medium including a program for executing the method for controlling an electronic device (100).

[0130] A device-readable storage 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.

[0131] According to one or more embodiments, the method according to the various embodiments disclosed in the present document may be provided as a computer program product. The computer program product may be traded between sellers and buyers as a product. The computer program product may be distributed in the form of a device-readable storage medium (e.g., compact disc read only memory (CD-ROM)) or may be available through an application store (e.g., Play Store). TM) or directly between two user devices (e.g., smartphones), online distribution (e.g., downloading or uploading). In the case of online distribution, at least a portion of the computer program product (e.g., downloadable app) may be at least temporarily stored or temporarily created in a device-readable storage medium, such as a manufacturer's server, an application store's server, or a memory (120) of an intermediary server.

[0132] Each of the components (e.g., modules or programs) according to the various embodiments of the present disclosure as described above may be composed of a single or multiple entities, and some of the sub-components described above may be omitted, or other sub-components may be further included in the various embodiments. Alternatively or additionally, some components (e.g., modules or programs) may be integrated into a single entity, which may perform the same or similar functions as those performed by each of the respective components prior to integration.

[0133] According to various embodiments, operations performed by a module, program or other component may be executed sequentially, in parallel, iteratively or heuristically, or at least some operations may be executed in a different order, omitted, or other operations may be added.

[0134] Meanwhile, the terms "part" or "module" used in the present disclosure include units composed of hardware, software, or firmware, and may be used interchangeably with terms such as logic, logic block, component, or circuit. A "part" or "module" may be an integrally composed component, a minimum unit performing one or more functions, or a portion thereof. For example, a module may be composed of an application-specific integrated circuit (ASIC).

[0135] Various embodiments of the present disclosure may be implemented as software including instructions stored in a machine-readable storage medium that can be read by a machine (e.g., a computer). The device may include an electronic device (e.g., an electronic device (100)) according to the disclosed embodiments, which is a device capable of calling instructions stored in the storage medium and operating according to the called instructions.

[0136] When the above instruction is executed by the processor, the processor may perform the function corresponding to the instruction directly or by using other components under the control of the processor. The instruction may include code generated or executed by a compiler or interpreter.

[0137] Although the preferred embodiments of the present disclosure have been illustrated and described above, the present disclosure is not limited to the specific embodiments described above, and various modifications may be made by a person having ordinary skill in the art to which the present disclosure pertains without departing from the gist of the present disclosure as claimed in the claims, and such modifications should not be understood individually from the technical idea or prospect of the present disclosure.

Claims

1. In electronic devices, An inverter comprising a plurality of upper switches, a plurality of lower switches corresponding to each of the plurality of upper switches, and a plurality of shunt resistors connected to each of the plurality of lower switches, and converting an input DC voltage into an AC voltage including three phases; A memory for storing data related to the control of the inverter; and A processor that controls the inverter to turn off at least some of the plurality of upper switches and the plurality of lower switches based on an angle representing the phase of the three phases; The above processor, Identifying first sections in which the duty ratio is a maximum or minimum value and second sections different from the first sections in each of the plurality of first signals corresponding to each of the plurality of upper switches, By limiting the upper limit of the duty ratio of the second sections in each of the plurality of first signals to a preset first threshold value, a plurality of second signals corresponding to each of the plurality of upper switches are obtained, An electronic device that controls the plurality of upper switches based on the plurality of second signals.

2. In paragraph 1, The above processor, An electronic device that obtains a plurality of second signals corresponding to each of the plurality of upper switches by limiting the upper limit of the duty ratio of the second sections in each of the plurality of first signals to a first threshold value and limiting the lower limit of the duty ratio of the second sections to a preset second threshold value.

3. In paragraph 1, The above processor, Identifying third sections in which the duty ratio is a maximum or minimum value and fourth sections different from the third sections in each of the plurality of third signals corresponding to each of the plurality of lower switches, By limiting the lower limit of the duty ratio of the fourth sections in each of the plurality of third signals to a preset third threshold value, a plurality of fourth signals corresponding to each of the plurality of lower switches are obtained, An electronic device that controls the plurality of lower switches based on the plurality of fourth signals.

4. In paragraph 3, The above processor, An electronic device that obtains a plurality of fourth signals corresponding to each of the plurality of upper switches by limiting the lower end of the duty ratio of the fourth sections in each of the plurality of third signals to a third threshold value and limiting the upper end of the duty ratio of the fourth sections to a preset fourth threshold value.

5. In paragraph 1, The above processor, An electronic device that detects the current of the inverter using the shunt resistor by obtaining the current value of each of two phases among the three phases in a section in which the duty ratio of the plurality of first signals corresponding to the plurality of upper switches among the plurality of sections is the smallest, and obtaining the current value of the remaining phase among the three phases based on the current value of each of the two phases.

6. In paragraph 1, The above electronic device, motor; including more, The above processor, Turn on the plurality of lower switches to charge the voltage for opening and closing the plurality of upper switches, Controlling the motor to align the rotor included in the motor at an angle that does not correspond to sections in which the duty ratio of at least one first signal among the plurality of first signals is at a maximum value; An electronic device that rotates the motor by transmitting the AC voltage value to the motor when the rotor is aligned.

7. In paragraph 6, The above processor, An electronic device that controls a motor to align a rotor included in the motor at an angle that does not correspond to an angle minus 90 degrees corresponding to the sections in which the duty ratio of at least one first signal is at a maximum value when applying a Q-axis current (Quadrature Axis Current) to align the rotor.

8. In paragraph 1, The above processor, An electronic device that controls the inverter so that the plurality of upper switches are alternately turned off and the plurality of lower switches are alternately turned off whenever the angle representing the phase of the three phases increases by 60 degrees.

9. A method for controlling an electronic device including an inverter that converts an input DC voltage into an AC voltage including three phases, The above inverter, It comprises a plurality of upper switches, a plurality of lower switches corresponding to each of the plurality of upper switches, and a plurality of shunt resistors connected to each of the plurality of lower switches. The above control method is, A step of identifying first sections in which the duty ratio is a maximum or minimum value and second sections different from the first sections in each of the plurality of first signals corresponding to each of the plurality of upper switches; A step of obtaining a plurality of second signals corresponding to each of the plurality of upper switches by limiting the upper limit of the duty ratio of the second sections in each of the plurality of first signals to a preset first threshold value; and A control method comprising: a step of controlling the plurality of upper switches based on the plurality of second signals; 10. In paragraph 9, The step of acquiring the above second signals is: A control method comprising: a step of obtaining a plurality of second signals corresponding to each of the plurality of upper switches by limiting the upper limit of the duty ratio of the second sections in each of the plurality of first signals to a first threshold value and limiting the lower limit of the duty ratio of the second sections to a preset second threshold value; 11. In paragraph 9, The above control method is, A step of identifying third sections in which the duty ratio is a maximum or minimum value and fourth sections different from the third sections in each of the plurality of third signals corresponding to each of the plurality of lower switches; A control method further comprising: a step of obtaining a plurality of fourth signals corresponding to each of the plurality of lower switches by limiting the lower limit of the duty ratio of the fourth sections in each of the plurality of third signals to a preset third threshold value; and a step of controlling the plurality of lower switches based on the plurality of fourth signals.

12. In paragraph 11, The step of acquiring the fourth signal is as follows: A control method comprising: a step of obtaining a plurality of fourth signals corresponding to each of the plurality of upper switches by limiting the lower end of the duty ratio of the fourth sections in each of the plurality of third signals to a third threshold value and limiting the upper end of the duty ratio of the fourth sections to a preset fourth threshold value; 13. In paragraph 9, The above control method is, A control method further comprising: a step of detecting the current of the inverter using the shunt resistor by obtaining the current value of each of two phases among the three phases in a section in which the duty ratio of the plurality of first signals corresponding to the plurality of upper switches among the plurality of sections is the smallest, and obtaining the current value of the remaining phase among the three phases based on the current value of each of the two phases; 14. In paragraph 9, The above control method is, A step of turning on the plurality of lower switches to charge voltage for opening and closing the plurality of upper switches; A step of aligning a rotor included in a motor of the electronic device at an angle that does not correspond to sections in which the duty ratio of at least one first signal among the plurality of first signals is at a maximum value; and A control method comprising: a step of rotating the motor by transmitting the AC voltage value to the motor when the rotor is aligned; 15. In paragraph 14, The step of aligning the rotor included in the above motor is: A control method comprising: a step of aligning the rotor included in the motor at an angle that does not correspond to an angle minus 90 degrees corresponding to the sections in which the duty ratio of the at least one first signal is the maximum value when applying a Q-axis current (Quadrature Axis Current) to align the rotor;

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