KR20200097426A - Power converting apparatus - Google Patents

Abstract

The present invention relates to a power converting apparatus. According to an embodiment of the present invention, the power converting apparatus comprises: an inverter which has a plurality of switching elements, and converts direct current power into alternating current power to output the alternating current power; a gate driving unit to output a driving signal for driving the plurality of switching elements; and a gate signal output unit which is connected between the inverter and the gate driving unit, and outputs a switching signal for controlling the operation of switching elements to the plurality of switching elements based on the driving signal. The gate signal output unit outputs the switching signal of a higher level than the level of the driving signal if the driving signal for a turn-on operation of at least one among the plurality of switching elements is inputted, and outputs the switching signal of a lower level than the level of the driving signal in accordance with a preset condition while the driving signal is inputted after the switching signal of the higher level than the driving signal is outputted. Accordingly, changes of a voltage applied to both ends of a switching element and a current flowing through the switching element can be controlled, thereby reducing loss caused during a turn-on operation of the switching element. Various other embodiments of the present invention are possible.

Description

Power conversion device {POWER CONVERTING APPARATUS}

The present invention relates to a power conversion device, and more particularly, to a power conversion device capable of reducing losses occurring during a turn-on operation of a switching element and improving electromagnetic compatibility (EMC).

The power conversion device refers to a device that converts and outputs supplied power. For example, an inverter that converts DC power into AC power and a control circuit that controls the operation of the inverter may be exemplified.

On the other hand, when the power conversion device operates to convert the supplied power, for example, when a switching element provided in the inverter is turned on/off, electromagnetic interference (EMI) noise may occur. Here, the EMI noise refers to electromagnetic noise in the form of electromagnetic waves generated from electronic devices.

EMI noise affects normal control signals and communication signals of electric devices, and may cause problems such as malfunction of electronic devices and communication failures, and various methods for reducing such EMI noise have been proposed.

For example, prior art 1 (Korean Patent Publication No. 10-2015-0142086) detects a common mode voltage between a drive shaft connecting a drive motor and a wheel and a frame of the drive motor, and a switching element according to the detection result. Disclosed is a configuration for reducing EMI noise by changing the size of the gate resistor connected to. However, in the case of conventional schemes such as prior art 1, a control unit such as a microcontroller unit (MCU) checks the detection result and controls each component of the electronic device according to the detection result to reduce EMI noise, so each component is quickly controlled. Problems that are difficult to do may occur.

It is an object of the present invention to convert the level of a driving signal that controls the turn-on operation of a switching element, thereby reducing losses that occur during the turn-on operation of the switching element, and improving electromagnetic compatibility (EMC). It is to provide a conversion device.

In order to achieve the above object, a power conversion device according to an embodiment of the present invention includes a plurality of switching elements, an inverter that converts DC power into AC power and outputs it, and a driving signal for driving the plurality of switching elements. And a gate signal output unit that is connected between the gate driving unit and the inverter and the gate driving unit for outputting, and outputs a switching signal for controlling an operation of the switching element to each of the plurality of switching elements based on the driving signal, and the gate signal output unit , When a driving signal for a turn-on operation of at least one of the plurality of switching elements is input, a switching signal having a level higher than that of the driving signal is output, and a switching signal having a higher level than the driving signal is output, and then driven While the signal is input, a switching signal having a level lower than the level of the driving signal may be output according to a preset condition.

The power conversion device according to various embodiments of the present invention can control changes in the current flowing through the switching element and the voltage applied to both ends of the switching element by converting the level of the signal input to the switching element, thereby switching Loss that occurs during the turn-on operation of the device can be reduced.

In addition, the power conversion device according to various embodiments of the present invention can reduce the peak level of the current flowing through the switching element by converting the level of the signal input to the switching element, thereby improving electromagnetic compatibility (EMC). .

In addition, in the power conversion device according to various embodiments of the present disclosure, a general control unit such as an MCU does not control level conversion of a signal input to a switching element, but a switching element through a separate field programmable gate array (FPGA). By converting the level of the signal input to the device, it is possible to control the operation of the switching element more quickly.

1 is an example of an internal block diagram of a power conversion device according to an embodiment of the present invention.
2 is an example of an internal block diagram of an inverter controller according to an embodiment of the present invention.
3A and 3B are examples of internal block diagrams of a gate signal output unit according to an embodiment of the present invention.
4A and 4B are diagrams referred to for explanation of the operation of the power conversion device according to an embodiment of the present invention.

Hereinafter, the present invention will be described in detail with reference to the drawings. In the drawings, in order to clearly and briefly describe the present invention, the illustration of parts not related to the description is omitted, and the same reference numerals are used for identical or extremely similar parts throughout the specification.

The suffixes "module" and "unit" for the constituent elements used in the following description are given in consideration of only the ease of writing in the present specification, and do not impart a particularly important meaning or role by themselves. Therefore, the "module" and "unit" may be used interchangeably with each other.

In the present application, terms such as "comprises" or "have" are intended to designate the presence of features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, but one or more other features. It is to be understood that the presence or additional possibility of additions or numbers, steps, actions, components, parts, or combinations thereof, is not preliminarily excluded.

In addition, in this specification, terms such as first and second may be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another.

1 is an example of an internal block diagram of a power conversion device according to an embodiment of the present invention.

Referring to FIG. 1, the power conversion device 100 may include, for example, an inverter 110, an inverter control unit 120, a gate driver 130, and a gate signal output unit 140. Meanwhile, the power conversion apparatus 100 may further include, for example, an input voltage detector (A) and/or an output current detector (B).

The inverter 110 may include, for example, a plurality of switching elements, and may output DC power to the motor 150 based on a signal received from the gate signal output unit 140. The motor 150 may include, for example, a three-phase synchronous motor.

More specifically, the inverter 110, for example, by changing the DC power (Vdc) smoothed by the on / off operation of a plurality of switching elements to a three-phase AC power supply of a predetermined frequency, to be output to the motor 150. I can.

For example, when the upper arm switching element and the lower arm switching element are connected in series to each other to form a pair, the inverter 110 may include a total of three pairs of upper and lower arm switching elements connected in parallel with each other. For each switching element included in the inverter 110, for example, a diode may be connected in reverse parallel.

The dc terminal voltage detector A may detect, for example, a voltage Vdc across a dc terminal to which DC power is supplied. To this end, the dc terminal voltage detection unit A may include a resistance element, an amplifier, and the like. The detected dc terminal voltage Vdc may be input to the inverter controller 120 as, for example, a discrete signal in the form of a pulse.

The output current detection unit B can detect, for example, an output current io flowing through the motor 150. The output current detection unit B may be disposed between the inverter 120 and the motor 150 to detect, for example, a current flowing through the motor 150.

The output current detection unit B may detect a phase current, which is an output current io of each phase flowing through the motor 150 through, for example, three resistance elements. The detected output current (io) is, for example, a discrete signal in the form of a pulse, and may be applied to the inverter control unit 120, and an inverter switching control signal (Sic) is generated based on the detected output current (io). Can be.

On the other hand, the output current detection unit B may be provided with, for example, two resistance elements. At this time, the phase current of the remaining one phase may be calculated using a three-phase balance.

The inverter controller 120 may output, for example, an inverter switching control signal Sic for controlling a switching operation of the inverter 110. The inverter switching control signal Sic may be, for example, a control signal of pulse width modulation (PWM).

The inverter controller 120 may generate and output an inverter switching control signal Sic based on, for example, an output current io flowing through the motor 150 and/or a dc voltage Vdc.

The gate driver 130 may be connected to the inverter controller 120, for example, and may receive an inverter switching control signal Sic from the inverter controller 120. The gate driving unit 130 is, for example, based on the inverter switching control signal Sic output from the inverter control unit 120, the gate driving signal for driving a plurality of switching elements provided in the inverter 110 (Si ) Can be created and printed. The gate driving signal Si may be, for example, a control signal of a pulse width modulation method (PWM).

The gate driver 130 may include, for example, a plurality of gate drivers (not shown) that generate and output the gate driving signal Si. The plurality of gate drivers may each receive an inverter switching control signal Sic from, for example, the inverter controller 120.

The plurality of gate drivers may respectively correspond to a plurality of switching elements provided in the inverter 110, and based on the inverter switching control signal Sic, a gate driving signal for driving the corresponding switching element Each (Si) can be output.

The gate signal output unit 140 may be connected to the gate driving unit 130, for example, and may receive the gate driving signal Si from the gate driving unit 130.

The gate signal output unit 140 is, for example, a switching signal for controlling a switching operation of a plurality of switching elements provided in the inverter 110 based on the gate driving signal Si output from the gate driving unit 130 Ssw may be generated, and the generated switching signal Ssw may be output to a plurality of switching elements provided in the inverter 110, respectively. The switching signal Ssw may be, for example, a control signal of a pulse width modulation method (PWM).

The gate signal output unit 140 may detect, for example, an input of the gate driving signal Si.

For example, the gate signal output unit 140 is a gate driving signal in which the gate driving signal Si transitions from a low level (eg, 0 V) to a high level (eg, 5 V). When the rising edge of (Si) is detected, it may be determined that the gate driving signal Si for the turn-on operation of the switching element is input.

For example, the gate signal output unit 140 is a gate driving signal in which the gate driving signal Si transitions from a high level (eg, 5 V) to a low level (eg, 0 V). When the falling edge of (Si) is detected, it may be determined that the gate driving signal Si for the turn-off operation of the switching element is input.

The gate signal output unit 140 is, for example, when a gate driving signal Si for a turn-on operation of a switching element is input, a switching signal Ssw having a level higher than that of the gate driving signal Si Can be generated and printed. Meanwhile, the gate signal output unit 140 may output, for example, a switching signal Ssw having a level higher than that of the gate driving signal Si for a preset time.

For example, the gate signal output unit 140 generates a switching signal Ssw of 10 V when a 5 V gate driving signal Si for a turn-on operation of the switching element is input, and the inverter ( 110) may be output to at least one of a plurality of switching elements.

On the other hand, the gate signal output unit 140, for example, after the switching signal Ssw having a higher level than the gate driving signal Si is output, while the gate driving signal Si is input, according to a preset condition. A switching signal Ssw having a level lower than that of the gate driving signal Si may be generated and output.

For example, the gate signal output unit 140 has a current value of the current isw flowing through the switching element outputting the switching signal Ssw having a higher level than the gate driving signal Si is equal to or greater than a preset first current value. In this case, a switching signal Ssw having a level lower than that of the gate driving signal Si may be generated and output.

On the other hand, for example, while the switching signal Ssw of a level lower than the level of the gate driving signal Si is output, the gate signal output unit 140 has a current value of the current isw flowing through the switching element. In the case of the set second current value, output of the switching signal Ssw having a level lower than that of the gate driving signal Si may be stopped.

For example, the gate signal output unit 140 outputs a timing when a gate driving signal Si for a turn-on operation of a switching element is input or a switching signal Ssw having a higher level than the gate driving signal Si. When a predetermined time has elapsed from the point in time, a switching signal Ssw having a level lower than that of the gate driving signal Si may be generated and output for a preset time.

The motor 150 includes, for example, a stator and a rotor, and AC power of each phase of a predetermined frequency is applied to the coils of the stator of each phase (a, b, c phase), The rotor can rotate.

The motor 150 is, for example, a Surface-Mounted Permanent-Magnet Synchronous Motor (SMPMSM), an embedded permanent magnet synchronous motor (Interidcr Permanent Magnet Synchronous Motor; IPMSM), and synchronous reluctance. It may include a Synchronous Reluctance Motor (Synrm) or the like. Among them, SMPMSM and IPMSM are Permanent Magnet Synchronous Motor (PMSM), and Synrm is characterized by no permanent magnet.

2 is an internal block diagram of an inverter controller according to an embodiment of the present invention. Detailed descriptions of contents overlapping with those described in FIG. 1 will be omitted.

Referring to FIG. 2, the inverter control unit 120 includes an axis conversion unit 210, a speed calculation unit 220, a current command generation unit 230, a voltage command generation unit 240, an axis conversion unit 250, and A switching control signal output unit 260 may be included.

The axis conversion unit 210, for example, receives the three-phase output current (ia, ib, ic) detected by the output current detection unit (B) and converts it into a two-phase current (iα, iβ) of the stationary coordinate system. have.

Meanwhile, the axis conversion unit 210 may convert, for example, the two-phase currents iα and iβ in the stationary coordinate system into the two-phase currents id and iq in the rotation coordinate system.

)와 연산된 속도(

)를 출력할 수 있다.The speed calculation unit 220, for example, based on the two-phase currents iα, iβ of the stationary coordinate system axis-changed in the axis conversion unit 210, the calculated position (

) And calculated speed (

) Can be printed.

)와 속도 지령치(ω^* _r)에 기초하여, 전류 지령치(i^* _q)를 생성할 수 있다. 예를 들어, 전류 지령 생성부(230)는, 연산 속도(

)와 속도 지령치(ω^* _r)의 차이에 기초하여, PI 제어기(235)에서 PI 제어를 수행하며, 전류 지령치(i^* _q)를 생성할 수 있다. 도면에서는, 전류 지령치로, q축 전류 지령치(i^* _q)를 도시하나, 본 발명이 이에 한정되는 것은 아니며, d축 전류 지령치(i^* _d)를 함께 생성할 수도 있다. 한편, d축 전류 지령치(i^* _d)의 값은 0으로 설정될 수도 있다. On the other hand, the current command generation unit 230, for example, the calculation speed (

) And the speed command value (ω ^* _r ), the current command value (i ^* _q ) can be generated. For example, the current command generation unit 230, the calculation speed (

) And the speed command value (ω ^* _r ), PI control is performed in the PI controller 235 and a current command value (i ^* _q ) can be generated. In the drawings, the q-axis current command value (i ^* _q ) is shown as the current command value, but the present invention is not limited thereto, and the d-axis current command value (i ^* _d ) may be generated together. Meanwhile, the value of the d-axis current command value (i ^* _d ) may be set to 0.

Meanwhile, the current command generation unit 230 may further include, for example, a limiter (not shown) that limits its level so that the current command value i ^* _q does not exceed the allowable range.

Next, the voltage command generation unit 240 is, for example, the d-axis and q-axis currents (i _d , i _q ) converted to a two-phase rotational coordinate system by the axis conversion unit, and the current command generation unit 230 Based on the current command values (i ^* _d , i ^* _q ) of, d-axis and q-axis voltage command values (v ^* _d , v ^* _q ) can be generated. For example, the voltage command generation unit 240 performs PI control in the PI controller 244 based on the difference between the q-axis current (i _q ) and the q-axis current command value (i ^* _q ), and q It is possible to generate the axis voltage command value (v ^* _q ). In addition, the voltage command generation unit 240, for example, based on the difference between the d-axis current (i _d ) and the d-axis current command value (i ^* _d ), the PI controller 248 performs PI control, and , d-axis voltage command value (v ^* _d ) can be generated. Meanwhile, the voltage command generation unit 240 may further include a limiter for limiting the level of the d-axis and q-axis voltage command values (v ^* _d , v ^* _q ) not exceeding the allowable range. .

Meanwhile, the generated d-axis and q-axis voltage command values (v ^* _d , v ^* _q ) may be input to, for example, the axis conversion unit 250.

)와, d축, q축 전압 지령치(v^* _d, v^* _q)를 입력받아, 축변환을 수행할 수 있다.The axis conversion unit 250 is, for example, a position calculated by the speed calculation unit 220 (

), and d-axis and q-axis voltage command values (v ^* _d , v ^* _q ), and axis transformation can be performed.

)가 사용될 수 있다.First, the axis conversion unit 250 converts from a two-phase rotation coordinate system to a two-phase stationary coordinate system. At this time, the position calculated by the speed calculating unit 220 (

) Can be used.

In addition, the axis conversion unit 250 may perform conversion from a 2-phase stationary coordinate system to a 3-phase stationary coordinate system. Through this conversion, the axis conversion unit 250 may output a three-phase output voltage command value (v ^* a, v ^* b, v ^* c).

The switching control signal output unit 260 receives, for example, a switching control signal Sic for an inverter according to a pulse width modulation method based on a three-phase output voltage command value (v ^* a, v ^* b, v ^* c). You can create and print it.

The inverter switching control signal Sic may be output to the gate driver 130, for example, and converted into a gate driving signal Si by the gate driver 130 and output to the gate signal output unit 140. have.

3A and 3B are examples of internal block diagrams of a gate signal output unit according to an embodiment of the present invention. Detailed descriptions of contents overlapping with those described in FIGS. 1 and 2 will be omitted.

Referring to FIG. 3A, the gate driver 130 may include, for example, a gate driver 131 that generates and outputs the gate driving signal Si.

In the drawings of the present invention, only one gate driver 131 is shown, but the present invention is not limited thereto. For example, the gate driver 130 may include a plurality of gate drivers respectively corresponding to a plurality of switching elements provided in the inverter 110.

The gate signal output unit 140 may include, for example, a signal output unit 141 and a signal combination unit 142.

In the drawings of the present invention, each of the signal output unit 141 and the signal combination unit 142 is shown, but the present invention is not limited thereto. For example, when the gate driver 130 includes a plurality of gate drivers, the gate signal output unit 140 may include a plurality of signal output units and a plurality of signal combination units respectively corresponding to the plurality of gate drivers. I can.

The signal output unit 141 may receive, for example, a gate driving signal Si from the gate driver 131, and a compensation signal Sf having a preset level based on the received gate driving signal Si Can be generated and printed.

For example, the signal output unit 141, when a 5V gate driving signal Si for a turn-on operation of the switching element is input, the compensation signal Sf of the first level (eg, 5V) Can be generated and printed. In this case, the signal output unit 141 may output the compensation signal Sf of the first level for a preset time.

On the other hand, the signal output unit 141 is, for example, from a time when a gate driving signal Si for a turn-on operation of a switching element is input or a time when a compensation signal Sf of a preset first level is output. When a preset time has elapsed, a compensation signal Sf having a second level different from the first level (eg, -2 V) may be generated and output. In this case, the signal output unit 141 may output the compensation signal Sf of the second level for a predetermined time, for example.

The signal combination unit 142 may receive, for example, a gate driving signal Si from the gate driver 131 and may receive a compensation signal Sf from the signal output unit 141. The signal combination unit 142 may add, for example, the gate driving signal Si and the compensation signal Sf, and output a switching signal Ssw.

The signal combination unit 142 may include, for example, a summer (not shown) for summing a plurality of signals.

The inverter 110 may include, for example, a switching element SW that operates according to the switching signal Ssw output from the gate signal output unit 140. In the drawings of the present invention, only one switching element SW is illustrated, but the present invention is not limited thereto, and a plurality of switching elements for outputting AC power may be provided.

The switching element SW may be, for example, a transistor element. The switching element SW may include, for example, a bipolar junction transistor (BJT) and/or a field effect transistor (FET). In the drawings of the present invention, the inverter 110 is illustrated as having an insulated gate bipolar transistor (IGBT), but the present invention is not limited thereto.

The signal combination unit 142 may output the switching signal Ssw to the input terminal G of the switching element SW, for example. Meanwhile, between the signal combination unit 142 and the switching element SW, for example, a gate resistor Rg may be disposed.

The switching element SW may perform a switching operation according to, for example, a switching signal Ssw. For example, when the switching signal Ssw for the turn-on operation of the switching element SW is input to the input terminal G, the current isw from one end (C) to the other end (E) of the switching element (SW). ) May flow, and the voltage value of the voltage applied to both ends C and E of the switching element SW may be changed.

On the other hand, the amount of change in the voltage value of the voltage applied to both ends (C, E) of the switching element (SW) and the amount of change in the current value of the current (isw) flowing from one end (C) to the other end (E) of the switching element (SW), For example, it may be changed according to the level of the switching signal Ssw input to the input terminal G.

For example, when the level of the switching signal Ssw input to the input terminal G increases, the amount of change in the voltage value of the voltage applied to both ends C and E of the switching element SW may increase.

For example, when the level of the switching signal Ssw input to the input terminal G increases, the amount of change in the current value of the current isw flowing from one end (C) to the other end (E) of the switching element (SW) increases. can do.

Referring to FIG. 3B, the gate signal output unit 140 may further include, for example, a current detection unit 143.

The current detection unit 143 may detect, for example, a current isw flowing from one end (C) to the other end (E) of the switching element SW. The current detection unit 143 may include, for example, a current sensor, a current transformer (CT), a shunt resistor, or the like, to detect the current isw in the switching element SW. The current isw detected by the current detection unit 143 may be input to, for example, the signal output unit 141.

The signal output unit 141 may generate and output a compensation signal Sf having a second level different from the first level based on, for example, the current isw detected by the current detection unit 143.

For example, when the current value of the current isw flowing through the switching element SW is greater than or equal to a preset first current value, the signal output unit 141 generates and outputs the second level compensation signal Sf. I can.

For example, the signal output unit 141, while the compensation signal Sf of the second level is output, the current value of the current isw flowing through the switching element SW corresponds to a preset second current value. In this case, the output of the second level compensation signal Sf may be stopped.

In the drawings of the present invention, it is shown that the current detection unit 143 detects the current flowing through the other end of the switching element SW, but the present invention is not limited thereto, and the current flowing through the one end of the switching element SW is detected. May be.

Meanwhile, in the present invention, the gate signal output unit 140 generates and outputs the first level and second level compensation signals Sf, the gate driving signal Si, and the compensation signal Sf. Although it has been described as including a signal combination unit 142 that adds up to, the present invention is not limited thereto.

For example, the signal output unit 141 outputs a signal according to an input of a gate driving signal Si for a turn-on operation of the switching element SW (eg, a high pass filter). pass filter; HPF)). In this case, the filter may output a signal whose level is changed according to a predetermined amount of change for a predetermined period of time based on a rising edge of the gate driving signal Si according to filtering characteristics.

In addition, for example, the signal combination unit 142 may add the signal output from the filter and the gate driving signal Si, and even when a signal output from the filter is not input, the signal combination unit 142 may be added to the switching element SW. The level of the gate driving signal Si may be reduced and output according to a preset condition such as a change in the flowing current isw.

4A and 4B are views referred to for explanation of the operation of the power conversion device according to an embodiment of the present invention.

Referring to FIG. 4A, in the case of a conventional power conversion device, a plurality of switching elements provided in the inverter 110 are gate driving signals (Si) output from the gate driver 130 because the signal output unit 140 is not provided. It can be entered directly into (SW).

Referring to reference numeral (a), it can be seen that at time t1, a gate driving signal Si of 5 V for a turn-on operation of the switching element SW is output from the gate driver 130.

Referring to reference numeral (b), from the time when the gate driving signal Si of 5 V is input to the input terminal G of the switching element SW provided in the inverter 110, the voltage of the input terminal G (Vg You can see that the voltage value of) rises.

Referring to reference numeral (c), it can be seen that the current isw flows through the switching element SW from the point t2 when the voltage Vg of the input terminal G is equal to or greater than the threshold voltage Vth.

Referring to (d), the voltage value of the voltage Vce applied to both ends C and E of the switching element SW is changed from the point t2 where the current isw flows through the switching element SW. Can be confirmed.

On the other hand, from the point of time t4 when the current isw flowing through the switching element SW reaches the peak value i1, the current isw having a constant current value i2 flows through the switching element SW. I can confirm.

In addition, from the point of time t4 where the current isw having a constant current value i2 flows through the switching element SW, the amount of change in the voltage value of the voltage Vce applied to both ends C and E of the switching element SW It can be seen that it increases.

Referring to FIG. 4B, since the power conversion device 200 according to various embodiments of the present invention includes a gate signal output unit 140 connected between the gate driver 130 and the inverter 110, the gate signal output unit The switching signal Ssw output from 140 may be input to a plurality of switching elements SW provided in the inverter 110.

Referring to reference numeral (a), it can be seen that at time t1, a gate driving signal Si of 5 V for a turn-on operation of the switching element SW is output from the gate driver 130.

Referring to reference numeral (b), the gate driving signal Si transitions from a low level (eg 0 V) to a high level (eg 5 V). As the rising edge is sensed at the time t1, it can be seen that the compensation signal Sf of the V1 level (eg, 5 V) is output from the signal output unit 141. In this case, a switching signal Ssw having a level higher than that of the gate driving signal Si by a level V1 may be input to the input terminal G of the switching element SW.

Meanwhile, a level higher than the level of the gate driving signal Si by V1 level input to the input terminal G of the switching element SW at the time t1 is, for example, the voltage Vg of the input terminal G at the time t1 ) May be a level that is equal to or greater than the threshold voltage Vth.

Meanwhile, the signal output unit 141 may output the compensation signal Sf of the V1 level during the period T1, which is a preset time. Alternatively, when the signal output unit 141 is a filter, a signal whose level is changed according to a predetermined amount of change during the period T1 based on the rising edge of the gate driving signal Si may be output according to filtering characteristics.

Referring to reference numeral (c), from the point of time t1 when the switching signal Ssw of a level higher by the level V1 than the level of the gate driving signal Si is input to the input terminal G of the switching element SW, the input terminal G It can be seen that the voltage value of the voltage Vg of) rises from the threshold voltage Vth.

On the other hand, compared with the period T1 of reference numeral (b) of FIG. 4A, the voltage change amount when the gate signal output unit 140 is provided is slightly higher than that when the conventional gate signal output unit 140 is not provided. You can see a big one.

In addition, compared with reference numeral (b) of FIG. 4A, when the gate signal output unit 140 is provided, the gate driving signal Si for the turn-on operation of the switching element SW from the gate driving unit 130 Since the voltage Vg of the input terminal G is already greater than or equal to the threshold voltage Vth at the time t1 when is output, it can be seen that the switching element SW can be controlled to be turned on faster than in the related art.

Referring to reference numeral (d), it can be seen that the current isw flows through the switching element SW from the time point t1 when the voltage Vg of the input terminal G is equal to or greater than the threshold voltage Vth.

On the other hand, compared to the reference numeral (c) of FIG. 4A, the amount of change in the current value of the current isw flowing through the switching element SW when the first level compensation signal Sf is output from the signal output unit 141 It can be seen that the current change amount is slightly larger than that in the case of not including the conventional gate signal output unit 140.

On the other hand, from the point of time t3' when the current value of the current isw flowing through the switching element SW reaches a predetermined current value i1' smaller than the conventional peak value i1, the V2 level from the signal output unit 141 ( Example: It can be seen that the compensation signal Sf of -2 V) is output. In this case, a switching signal Ssw having a level lower than the level of the gate driving signal Si by a level V2 may be input to the input terminal G of the switching element SW.

In addition, during the period T3'', the voltage value of the voltage Vg of the input terminal G decreases, and the current isw of a predetermined current value i1' smaller than the conventional peak value i1 is applied to the switching element SW. You can see that it flows.

On the other hand, referring to reference numeral (d), from the time point t4 when the current isw flowing through the switching element SW of the conventional power conversion device reaches the peak value i1, a constant current value ( It can be seen that the current (isw) with i2) flows.

In addition, it can be seen that the output of the compensation signal Sf of the V2 level is stopped from the time t4 when the current isw having a constant current value i2 flows through the switching element SW.

Meanwhile, the signal output unit 141 may output the compensation signal Sf of the V2 level during the period T3'', which is a preset time, and while the compensation signal Sf of the V2 level is output, the switching element SW When the current value of the current isw flowing through) reaches i2, the output of the second level compensation signal Sf may be stopped.

Referring to (e), the voltage value of the voltage Vce applied to both ends (C, E) of the switching element (SW) is changed from the time t1 where the current (isw) flows through the switching element (SW). It can be seen that the voltage change amount is changed according to the level of the switching signal Ssw input to the input terminal G.

Accordingly, according to various embodiments of the present disclosure, by converting the level of a signal input to the switching element SW provided in the inverter 110, the current isw flowing through the switching element SW and the switching element SW It is possible to control the change of the voltage (Vce) applied to both ends (C, E) of, through this, it is possible to reduce the loss generated during the turn-on operation of the switching element (SW).

In addition, according to various embodiments of the present invention, by converting the level of a signal input to the switching element SW provided in the inverter 110, the peak level of the current isw flowing through the switching element SW can be reduced. Thus, electromagnetic compatibility (EMC) can be improved.

In addition, according to various embodiments of the present disclosure, a general controller such as an MCU does not control level conversion of a signal input to the switching element SW, but a separate field programmable controller such as the gate signal output unit 140 gate array), since the level of the signal input to the switching element SW is converted, the operation of the switching element SW can be more quickly controlled.

The accompanying drawings are only for making it easier to understand the embodiments disclosed in the present specification, and the technical idea disclosed in the present specification is not limited by the accompanying drawings, and all changes and equivalents included in the spirit and scope of the present invention It should be understood to include water or substitutes.

Likewise, while depicting the actions in the drawings in a specific order, it should not be understood that such actions should be performed in that particular order or sequential order shown in order to obtain a desired result, or that all illustrated actions should be performed. . In certain cases, multitasking and parallel processing can be advantageous.

In addition, although the preferred embodiments of the present invention have been illustrated and described above, the present invention is not limited to the specific embodiments described above, and the technical field to which the present invention belongs without departing from the gist of the present invention claimed in the claims. In addition, various modifications are possible by those of ordinary skill in the art, and these modifications should not be individually understood from the technical spirit or prospect of the present invention.

100: power converter
110: inverter
120: inverter control unit
130: gate driver
140: gate signal output unit
150: motor
A: DC voltage detector
B: output current detection unit

Claims (10)

An inverter having a plurality of switching elements and converting DC power into AC power and outputting the converted;
A gate driver outputting a driving signal for driving the plurality of switching elements; And
A gate signal output unit connected between the inverter and the gate driving unit and configured to respectively output a switching signal for controlling an operation of a switching element to the plurality of switching elements based on the driving signal,
The gate signal output unit,
When the driving signal for a turn-on operation of at least one of the plurality of switching elements is input, outputting the switching signal of a level higher than the level of the driving signal,
After the switching signal having a higher level than the driving signal is output, the switching signal having a level lower than the level of the driving signal is output according to a preset condition while the driving signal is input. The method of claim 1,
A signal output unit generating and outputting a signal of a first level when a driving signal for the turn-on operation is input; And
And a signal combination unit for summing the driving signal and a signal output from the signal output unit and outputting the switching signal. The method of claim 2,
The signal output unit,
Power conversion device, characterized in that for outputting the signal of the first level for a predetermined first time. The method of claim 3,
The signal output unit,
When a rising edge in which the driving signal transitions from a low level to a high level is detected, it is determined that a driving signal for a turn-on operation of the switching element is input. Power conversion device. The method of claim 4,
The drive signal is a power conversion device, characterized in that the pulse width modulation (PWM) signal. The method of claim 4,
Further comprising a current detection unit for detecting each of the current flowing through the plurality of switching elements,
The signal output unit,
When a current greater than or equal to a preset first current value is detected through the current detection unit, a second level signal is generated and output. The method of claim 6,
The signal output unit,
And when a current of a preset second current value is detected while outputting the second level signal, the output of the second level signal is stopped. The method of claim 4,
The signal output unit,
When a preset second time has elapsed from a time when the rising edge is detected or a time when the first level signal is output, the second level signal is output for a preset third time. . The method of claim 2,
The gate driver,
And a plurality of gate drivers each outputting the driving signal to a corresponding switching element among the plurality of switching elements. The method of claim 9,
The gate signal output unit,
And a plurality of signal output units and a plurality of signal combination units respectively corresponding to the plurality of gate drivers.

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