WO2023238292A1 - Power conversion device, motor drive device, and refrigeration cycle applied equipment - Google Patents

Abstract

A power conversion device (1) that performs conversion of electric power includes one or more switching elements (311a to 311f) included in an inverter (310) that converts direct current electric power into alternating current electric power, a waveform shape changing unit (340) that is capable of changing waveform shapes of switching waveforms of the switching elements (311a to 311f), a physical quantity detecting unit (501, 502, 504, 505) that detects a physical quantity having a correlation with at least one of electromagnetic noise and loss occurring in the power conversion device (1) due to switching of the switching elements (311a to 311f), and a waveform shape control signal output unit (420) that outputs a control signal when changing the switching waveforms of the switching elements (311a to 311f) at the waveform shape changing unit (340), in accordance with the physical quantity.

Description

Power conversion equipment, motor drive equipment, and refrigeration cycle application equipment

The present disclosure relates to a power conversion device, a motor drive device, and a refrigeration cycle application device that performs power conversion.

Conventionally, the switching speed of a switching element has been changed by switching and connecting gate resistors with different gate resistance values to the switching element. For example, in Patent Document 1, in an inverter control device including an inverter main circuit having a plurality of switching elements, when changing the gate drive waveform of the switching element, the gate resistance connected to the switching element is changed to a different gate using a switch. A technique for switching to a resistive gate resistor is disclosed.

Japanese Patent Application Publication No. 2012-200042

The inverter control device described in Patent Document 1 operates in consideration of both generated noise and loss. However, the inverter control device described in Patent Document 1 detects the DC bus voltage, the current flowing from the inverter main circuit to the compressor, etc., and uses the detected values to actually change the switching speed of the switching elements. However, there is a limit to the number of gate resistance values that can be used to change the switching speed. Therefore, the inverter control device described in Patent Document 1 has a problem in that even if feedback control is performed using the detected value, the switching speed of the switching elements cannot be set to the optimal condition, and the desired operating state may not be achieved. was there.

The present disclosure has been made in view of the above, and aims to provide a power conversion device that can be controlled to a desired operating state by feedback control.

In order to solve the above-mentioned problems and achieve the objectives, the present disclosure is a power conversion device that performs power conversion. The power conversion device includes one or more switching elements included in an inverter that converts DC power into AC power, a waveform shape changing section that can change the waveform shape of a switching waveform of the switching element, and a power conversion device by switching the switching elements. a physical quantity detection unit that detects a physical quantity that is correlated with at least one of electromagnetic noise and loss generated in A shape control signal output section.

The power conversion device according to the present disclosure has the effect that it can be controlled to a desired operating state by feedback control.

A first diagram showing a configuration example of a power conversion device according to Embodiment 1. A second diagram showing a configuration example of the power conversion device according to Embodiment 1 Third diagram illustrating a configuration example of the power conversion device according to Embodiment 1 A diagram showing an example of turn-on Joule loss, turn-on current, and turn-on voltage when the switching speed of the switching element of the inverter is slowed down in the power conversion device according to Embodiment 1. A diagram showing an example of turn-on Joule loss, turn-on current, and turn-on voltage when the switching speed of the switching element of the inverter is increased in the power conversion device according to Embodiment 1. Diagram showing an example of the relationship between noise and loss generated in general switching elements The first diagram showing the effect obtained by changing the switching speed of the switching element of the inverter in the power conversion device according to the first embodiment. A second diagram illustrating the effect obtained by changing the switching speed of the switching element of the inverter in the power conversion device according to Embodiment 1. A diagram showing a configuration example of a waveform shape changing section of the power conversion device according to Embodiment 1. The first diagram showing the relationship between the gate current output by the waveform shape changing unit and the gate voltage indicating the rising speed of the switching element in the power conversion device according to the first embodiment. A second diagram showing the relationship between the gate current output by the waveform shape changing unit and the gate voltage indicating the rising speed of the switching element in the power conversion device according to the first embodiment. 3 is a third diagram showing the relationship between the gate current output by the waveform shape changing unit and the gate voltage indicating the rising speed of the switching element in the power converter according to the first embodiment; FIG. A diagram showing an example of the relationship between the basic pulse output by the basic pulse generation unit and the gate current output by the waveform shape changing unit in the power conversion device according to Embodiment 1. Flowchart showing the operation of changing the waveform shape of the switching waveform of the switching element in the power conversion device according to Embodiment 1 A diagram illustrating an example of a hardware configuration that implements a control unit included in the power conversion device according to Embodiment 1. A diagram showing a configuration example of a power conversion device according to Embodiment 2 A diagram illustrating an example of a physical quantity to be extracted and a feature quantity after extraction in the feature quantity extraction unit of the power conversion device according to Embodiment 2. A diagram showing a configuration example of a power conversion device according to Embodiment 3 A diagram showing a configuration example of a power conversion device according to Embodiment 4 A diagram showing a configuration example of a power conversion device according to Embodiment 5 A diagram showing an image of a toroidal core portion of a physical quantity detection unit of a power conversion device according to Embodiment 5. A diagram showing a configuration example of a power conversion device according to Embodiment 7 A diagram illustrating a configuration example of a speed estimating device included in a power conversion device according to Embodiment 7. A diagram showing a configuration example of a power conversion device according to Embodiment 8 As a comparative example, a diagram showing examples of each current and the capacitor voltage of the capacitor when the current output from the rectifier is smoothed with a capacitor and the current flowing to the inverter is kept constant. A diagram showing an example of each current and the capacitor voltage of the capacitor when the control unit of the power conversion device according to Embodiment 8 controls the operation of the inverter to reduce the current flowing to the capacitor. A diagram showing a configuration example of a power conversion device according to Embodiment 9 A diagram showing a configuration example of a power conversion device according to Embodiment 10 A diagram showing a configuration example of a refrigeration cycle application device according to Embodiment 11

Below, a power conversion device, a motor drive device, and a refrigeration cycle application device according to an embodiment of the present disclosure will be described in detail based on the drawings.

Embodiment 1.
FIG. 1 is a first diagram showing a configuration example of a power conversion device 1 according to the first embodiment. Power conversion device 1 is connected to commercial power source 110 and motor 314. The power conversion device 1 converts the first AC power of the power supply voltage Vs supplied from the commercial power supply 110 into second AC power having a desired amplitude and phase, and supplies the second AC power to the motor 314. Although the commercial power source 110 is a three-phase AC power source in the example of FIG. 1, it may be a single-phase AC power source. The power conversion device 1 includes a physical quantity detection section 501, a rectification section 130, a capacitor 210, a physical quantity detection section 502, an inverter 310, a physical quantity detection section 504, a physical quantity detection section 505, and a control section 400. . Note that the power conversion device 1 and the motor 314 constitute a motor drive device 2.

The physical quantity detection unit 501 detects a physical quantity that is correlated with electromagnetic noise generated in the power conversion device 1 by switching of switching elements 311a to 311f, which will be described later, included in the inverter 310. The physical quantity detection unit 501 detects a physical quantity that is correlated with electromagnetic noise generated in the power conversion device 1, for example, based on pulsations in the current flowing through the installed portions, pulsations in the voltage applied to the installed portions, and the like. The electromagnetic noise generated in the power conversion device 1 includes conduction noise generated in the power conversion device 1 and radiation noise generated in the power conversion device 1. Note that in the power conversion device 1, the installation position of the physical quantity detection unit 501 is not limited to the example shown in FIG. Further, although the power conversion device 1 includes one physical quantity detection section 501 in the example of FIG. 1, it may include a plurality of physical quantity detection sections 501.

The rectifier 130 rectifies the AC power of the power supply voltage Vs supplied from the commercial power supply 110 and converts it into DC power. The rectifier 130 includes, for example, a bridge circuit including four rectifiers (not shown) and a reactor, and rectifies the AC power of the power supply voltage Vs supplied from the commercial power supply 110. Note that the rectifier 130 may include a boost chopper circuit or the like.

The capacitor 210 is connected to the output end of the rectifier 130 and smoothes the DC power converted by the rectifier 130. The capacitor 210 is, for example, an electrolytic capacitor, a film capacitor, or the like. Note that the power converter 1 only needs to be able to supply DC power to the inverter 310, so the commercial power supply 110, rectifier 130, and capacitor 210 may be replaced with a DC power supply, a battery, or the like.

The inverter 310 is a power converter connected to both ends of the capacitor 210. Inverter 310 has switching elements 311a to 311f and free wheel diodes 312a to 312f. The inverter 310 turns on and off the switching elements 311a to 311f under the control of the control unit 400 and converts the power output from the rectifier 130 and the capacitor 210 into second AC power having a desired amplitude and phase. AC power is generated and output to the motor 314. The switching elements 311a to 311f are, for example, IGBTs (Insulated Gate Bipolar Transistors), MOSFETs (Metal Oxide Semiconductor Field Effect Tr). transistors), bipolar transistors, etc., but are not limited to these. The circuit configuration of the inverter 310 is not particularly limited, and may be a full bridge circuit, a single-phase bridge circuit, a half bridge circuit, or the like. Furthermore, in this embodiment, the inverter 310 includes a waveform shape changing section 340 that can change the waveform shape of the switching waveforms of the switching elements 311a to 311f. The waveform shape changing section 340 can output two or more waveform shapes as the waveform shapes of the switching waveforms of the switching elements 311a to 311f. In the example of FIG. 1, the waveform shape changing unit 340 is configured to be able to change the waveform shape of the switching waveform of the switching elements 311a to 311f, but the waveform shape of the switching waveform of at least one switching element among the switching elements 311a to 311f is The shape can be changed. Furthermore, the inverter 310 may be configured to include a waveform shape changing section 340 for each of the switching elements 311a to 311f. The detailed operation of the waveform shape changing section 340 will be described later.

The physical quantity detection unit 502 detects a physical quantity that is correlated with the loss that occurs in the power conversion device 1 due to switching of the switching elements 311a to 311f included in the inverter 310. The physical quantity detection unit 502 is, for example, a thermocouple, and detects a physical quantity correlated with the loss generated in the power conversion device 1 by detecting the heat generated in the installed portion, that is, the temperature. When the physical quantity detection unit 502 is a thermocouple, the physical quantity detection unit 502 is installed, for example, around the switching elements 311a to 311f, a substrate (not shown) on which the switching elements 311a to 311f, etc. are mounted, a heat sink, or the like. Note that in the power conversion device 1, the installation position of the physical quantity detection unit 502 is not limited to the example shown in FIG. Further, although the power conversion device 1 includes one physical quantity detection section 502 in the example of FIG. 1, it may include a plurality of physical quantity detection sections 502. The physical quantity detection unit 504 detects a physical quantity correlated with electromagnetic noise or loss generated in the power conversion device 1. The physical quantity detection unit 504 detects, for example, the current value of the DC power supplied from the capacitor 210 to the inverter 310. The physical quantity detection unit 505 detects a physical quantity correlated with electromagnetic noise or loss generated in the power conversion device 1. The physical quantity detection unit 505 detects, for example, current flowing through the switching elements 311b, 311d, and 311f.

The control unit 400 acquires the physical quantities detected by the physical quantity detection units 501, 502, 504, and 505 from the physical quantity detection units 501, 502, 504, and 505, and controls the operation of the inverter 310 based on the acquired physical quantities. Specifically, the switching elements 311a to 311f of the inverter 310 are controlled to be turned on or off. The control section 400 includes a basic pulse generation section 410 and a waveform shape control signal output section 420.

The basic pulse generation unit 410 has a duty ratio according to the physical quantities detected by the physical quantity detection units 501, 502, 504, and 505, and generates basic pulses for controlling the operation of the switching elements 311a to 311f of the inverter 310. do. The basic pulse is, for example, a PWM (Pulse Width Modulation) signal having a duty ratio according to the physical quantities detected by the physical quantity detection units 501, 502, 504, and 505. In addition to the physical quantities detected by the physical quantity detection units 501, 502, 504, and 505, the basic pulse generation unit 410 generates, for example, the voltage value and current value of the DC power supplied from the capacitor 210 to the inverter 310, and the The voltage value, current value, etc. of the second AC power supplied to the motor 314, which is a load, are acquired from a detection unit (not shown), and the acquired detected values are used to control the operation of the switching elements 311a to 311f of the inverter 310. A basic pulse may be generated to control the The basic pulse generation section 410 outputs basic pulses for controlling the operations of the switching elements 311a to 311f of the inverter 310 to the waveform shape control signal output section 420.

The waveform shape control signal output section 420 controls the switching waveforms of the switching elements 311a to 311f in the waveform shape changing section 340 of the inverter 310 according to the physical quantities detected by the physical quantity detecting sections 501, 502, 504, and 505. The waveform shape of the switching waveform of the switching elements 311a to 311f is set, and a control signal indicating the set waveform shape is output. Specifically, the waveform shape control signal output unit 420 turns on and off the switching elements 311a to 311f based on the basic pulse generated by the basic pulse generation unit 410 for controlling the operation of the switching elements 311a to 311f of the inverter 310. At this time, the waveform shape changing unit 340 of the inverter 310 controls the magnitude of the drive signal output to the switching elements 311a to 311f and the timing of outputting the drive signal in order to actually drive the switching elements 311a to 311f. The waveform shape control signal output section 420 outputs a control signal for controlling the operation of the waveform shape modification section 340 to the waveform shape modification section 340 . When the inverter 310 includes a waveform shape changing section 340 for each of the switching elements 311a to 311f, that is, six waveform shape changing sections 340, the control section 400 controls a waveform shape control signal output section 420 for each waveform shape changing section 340. In other words, the configuration may include six waveform shape control signal output sections 420. The waveform shape control signal output section 420 includes a setting section 421, as shown in FIG. The specific operations performed by the setting unit 421 will be described later.

In addition, in the example of FIG. 1, the control unit 400 acquires the physical quantities detected by the physical quantity detection units 501, 502, 504, and 505 from the physical quantity detection units 501, 502, 504, and 505, and based on the acquired physical quantities. , the operation of the inverter 310 is controlled, but the invention is not limited thereto. The control unit 400 can control the operation of the inverter 310 based on the physical quantity acquired from at least one of the physical quantity detection units 501, 502, 504, and 505. FIG. 2 is a second diagram showing a configuration example of the power conversion device 1 according to the first embodiment. FIG. 3 is a third diagram showing a configuration example of the power conversion device 1 according to the first embodiment. The power conversion device 1 shown in FIG. 2 is obtained by removing the physical quantity detection section 502 from the power conversion device 1 shown in FIG. 1, and includes a physical quantity detection section 501. Further, the power conversion device 1 shown in FIG. 3 is obtained by removing the physical quantity detection unit 501 from the power conversion device 1 shown in FIG. 1, and includes a physical quantity detection unit 502. In this way, the power converter 1 only needs to include a physical quantity detection unit that detects a physical quantity that is correlated with at least one of electromagnetic noise and loss generated in the power converter 1 due to switching of the switching elements 311a to 311f. . The power conversion device 1 does not need to arrange all the physical quantity detection units 501, 502, 504, and 505 as shown in FIG. The power conversion device 1 may include the operating state detection section anywhere as long as the operating state can be detected at a position other than that shown in the figure. Hereinafter, the power conversion device 1 shown in FIG. 1 will be described as an example. Embodiment 2 and subsequent embodiments to be described later will also be explained using the power conversion device 1 shown in FIG. 1 as an example, but all embodiments are based on the power conversion device 1 shown in FIG. It is also applicable to device 1.

The motor 314 is a load connected to the power converter 1. The motor 314 is, for example, a compressor motor for driving a compressor. The motor 314 rotates according to the amplitude and phase of the second AC power supplied from the inverter 310, and performs a compression operation. For example, when the compressor is a hermetic compressor, the load torque of the motor 314 that drives the compressor can often be regarded as a constant torque load. The motor 314 may have a Y-connection, a Δ-connection, or a specification in which the Y-connection and the Δ-connection can be switched for motor windings (not shown). Further, the load connected to the power conversion device 1, that is, the inverter 310 is not limited to the compressor driving motor 314, but may be a fan motor or the like. Further, the load connected to the power converter 1 is not limited to the motor 314, and may be a load other than the motor 314.

In the present embodiment, the power conversion device 1 can change the waveform shapes of the switching waveforms of the switching elements 311a to 311f of the inverter 310 using the waveform shape control signal output section 420 and the waveform shape changing section 340. Specifically, the power conversion device 1 can change the switching speed, delay time, etc. of the switching elements 311a to 311f of the inverter 310.

FIG. 4 is a diagram showing examples of turn-on Joule loss, turn-on current, and turn-on voltage when the switching speeds of switching elements 311a to 311f of inverter 310 are slowed down in power converter 1 according to Embodiment 1. FIG. 5 is a diagram showing an example of turn-on Joule loss, turn-on current, and turn-on voltage when the switching speed of switching elements 311a to 311f of inverter 310 is increased in power converter 1 according to the first embodiment. In FIGS. 4 and 5, A indicates turn-on joule loss, B indicates turn-on current, and C indicates turn-on voltage. In FIGS. 4 and 5, the horizontal axis indicates time. For example, the turn-on current is the current flowing through the switching element 311a, the turn-on voltage is the voltage applied across the switching element 311a, and the turn-on Joule loss is the product of the turn-on current and the turn-on voltage, but the measurement target is the switching element 311a. It is not limited to the element 311a, and other switching elements 311b to 311f may be used. Note that FIGS. 4 and 5 show the differences in each characteristic depending on the switching speed of the switching elements 311a to 311f of the inverter 310, and the specific values of "slow" and "fast" in the switching speed are not particularly important. . As shown in FIGS. 4 and 5, by slowing down the switching speed, the noise represented by the peak value of the turn-on current of B becomes smaller, but the loss represented by the area of the turn-on joule loss of A becomes larger. Furthermore, as shown in FIGS. 4 and 5, by increasing the switching speed, the noise indicated by the peak value of the turn-on current of B increases, but the loss indicated by the area of the turn-on joule loss of A decreases. . That is, in the switching elements 311a to 311f, there is a trade-off relationship between noise and loss generated.

In the power conversion device 1, the waveform shape changing unit 340 is configured by a digital gate driver. Alternatively, in the power conversion device 1, the switching elements 311a to 311f of the inverter 310 and the waveform shape changing section 340 are configured by a digital gate driver module. Thereby, the power conversion device 1 can change the switching speed of the switching elements 311a to 311f of the inverter 310 by changing the command value of the software without changing the hardware, and the switching elements 311a to 311f It is possible to control noise and loss generated in a desired state.

FIG. 6 is a diagram showing an example of the relationship between noise and loss generated in a general switching element. As mentioned above, there is a trade-off relationship between noise and loss generated in switching elements. Therefore, as shown in FIG. 6, in general switching elements, increasing the switching speed increases noise but decreases loss, and decreasing the switching speed decreases noise but increases loss.

FIG. 7 is a first diagram showing the effects obtained by changing the switching speeds of switching elements 311a to 311f of inverter 310 in power conversion device 1 according to Embodiment 1. Even if the power converter 1 is operated within the noise range specified by the product in which the power converter 1 is installed, when the load state of the motor 314 changes from light load to heavy load, the power converter 1 will cause the noise shown in FIG. 7 to change from light load to heavy load. As such, the curve showing the characteristics of noise and loss generated in the switching elements 311a to 311f moves toward the upper right, resulting in an increase in noise. That is, in the power conversion device 1, the heavier the load, the more noise increases. Therefore, the power converter 1 can reduce the noise generated in the switching elements 311a to 311f by slowing down the switching speed of the switching elements 311a to 311f. Similarly, even if the power converter 1 is operated within the loss range specified by the product in which the power converter 1 is installed, when the load state of the motor 314 changes from light load to heavy load, the As shown in 7, the curve showing the characteristics of noise and loss generated in the switching elements 311a to 311f moves toward the upper right, and as a result, the loss increases. That is, in the power conversion device 1, the heavier the load, the more the loss increases. Therefore, the power conversion device 1 can reduce the loss generated in the switching elements 311a to 311f by increasing the switching speed of the switching elements 311a to 311f.

When the load state of the motor 314 changes from a light load to a heavy load, the waveform shape control signal output unit 420 controls the noise generated in the switching elements 311a to 311f while satisfying the specified requirements. The waveform shapes of the switching waveforms of the switching elements 311a to 311f are changed to reduce the loss caused by the switching elements 311a to 311f. Alternatively, when the load state of the motor 314 changes from a light load to a heavy load, the waveform shape control signal output unit 420 outputs a signal to the switching elements 311a to 311f while satisfying the specified requirements for loss generated in the switching elements 311a to 311f. The waveform shapes of the switching waveforms of the switching elements 311a to 311f are changed so as to reduce the noise generated in the switching elements 311a to 311f.

FIG. 8 is a second diagram showing the effect obtained by changing the switching speeds of switching elements 311a to 311f of inverter 310 in power conversion device 1 according to Embodiment 1. The power conversion device 1, specifically the waveform shape changing unit 340, divides a turn-on period or a turn-off period into two or more periods in one switching operation of the switching elements 311a to 311f, and in each divided period, The amplitudes of the gate currents or gate voltages for the switching elements 311a to 311f are changed to different magnitudes. The power conversion device 1 optimizes the switching waveforms of the switching elements 311a to 311f as shown in FIG. noise and loss characteristics can be obtained.

Here, the configuration of the waveform shape changing section 340 will be explained. Here, as an example, in order to simplify the explanation, a case will be described in which the waveform shape changing section 340 can change the waveform shape of the switching waveform of one switching element 311a. FIG. 9 is a diagram illustrating a configuration example of waveform shape changing section 340 of power conversion device 1 according to Embodiment 1. FIG. 9 is also a diagram showing a configuration example of one digital gate driver module configured by the waveform shape changing section 340 and the switching element 311a. As shown in FIG. 1, the waveform shape changing section 340 is included in the inverter 310, which is a power converter including a switching element 311a. The waveform shape changing unit 340 includes n PMOSs (P-channel Metal Oxide Semiconductor) which are P-channel MOSFETs for turn-on, n PreDrivers for operating the n PMOSs, and n PreDrivers for turn-off. It includes an NMOS (N-channel Metal Oxide Semiconductor) that is an N-channel MOSFET, and n PreDrivers for operating the n NMOS.

The waveform shape changing section 340 is connected to the control power supply Vdd and the ground GND. The waveform shape changing section 340 changes the number of PMOSs or NMOSs to be operated based on the control signal from the waveform shape control signal output section 420, thereby outputting it to the switching element 311a in each of the turn-on period and the turn-off period. The amplitude value of the gate current _IG , which is the drive signal, can be changed in n ways to adjust the switching speed of the switching element 311a. The waveform shape changing unit 340 can increase the absolute value of the gate current _IG output to the switching element 311a as the number of PMOSs or NMOSs to be operated increases, and the switching speed of the switching element 311a can be increased. can. In addition, the waveform shape changing unit 340 can finely adjust the switching speed of the switching element 311a as the number of PMOSs and NMOSs included therein increases, and the faster the response to increase/decrease the gate current _IG , the more finely the switching speed of the switching element 311a can be adjusted. It is possible to finely adjust the gate current _IG during the switching period. The control signal from the waveform shape control signal output section 420 may be an analog signal or a digital signal as long as it can change the number of PMOSs or NMOSs operated by the waveform shape changing section 340. In addition, the example in FIG. 9 shows that there are m control signals in parallel from the waveform shape control signal output section 420 to the waveform shape change section 340, but this is just an example, and the number of control signals is m. Not limited. The number of control signals may be a number that can indicate whether each PMOS and each NMOS can operate, or it may be one as long as it is an analog signal that indicates voltage or the like.

FIG. 10 is a first diagram showing the relationship between the gate current _IG output by the waveform shape changing unit 340 and the gate voltage _VG indicating the rising speed of the switching element 311a in the power conversion device 1 according to the first embodiment. be. FIG. 11 is a second diagram showing the relationship between the gate current _IG output by the waveform shape changing unit 340 and the gate voltage _VG indicating the rising speed of the switching element 311a in the power conversion device 1 according to the first embodiment. be. As shown in FIGS. 10 and 11, the waveform shape changing unit 340 can increase the rise of the gate voltage _VG , that is, increase the switching speed of the switching element 311a, as the output gate current _IG increases. can. In addition, as shown in FIGS. 10 and 11, the waveform shape changing unit 340 slows down the rise of the gate voltage _VG , that is, the switching speed of the switching element 311a, as the output gate current _IG becomes smaller. be able to. As a result, as shown in FIG. 7, when the power conversion device 1 wants to reduce the noise generated in the switching element 311a, the output gate current _IG is decreased to slow the switching speed, and the noise generated in the switching element 311a is reduced. When it is desired to reduce the loss, the output gate current _IG can be increased to increase the switching speed. Note that the waveforms of the gate current _IG and gate voltage _VG shown in FIGS. 10 and 11 are ideal examples, and in reality, as shown in FIGS. 4 and 5, the gate current _IG is constant. It will take time to reach the current value.

FIG. 12 is a third diagram showing the relationship between the gate current _IG output by the waveform shape changing unit 340 and the gate voltage _VG indicating the rising speed of the switching element 311a in the power conversion device 1 according to the first embodiment. be. As shown in FIG. 12, the waveform shape changing unit 340 can divide the turn-on period and change the magnitude of the gate current _IG in each period. That is, the waveform shape changing section 340 can finely adjust the magnitude of the gate current _IG during one turn-on period. As a result, the power converter 1 can reduce the noise generated in the switching element 311a while reducing the noise generated in the switching element 311a, as shown in FIG. 8, compared to the case where the same gate current _IG is output during the turn-on period. control can be performed to reduce the loss caused by

Although the turn-on period of the switching element 311a has been described as an example using FIGS. 10 to 12, the same applies to the turn-off period of the switching element 311a. FIG. 13 is a diagram illustrating an example of the relationship between the basic pulse outputted by the basic pulse generation unit 410 and the gate current _IG outputted by the waveform shape modification unit 340 in the power conversion device 1 according to the first embodiment. In FIG. 13, it is assumed that |Ig2|>|Ig1|. The waveform shape changing unit 340 divides the period in which the gate current _IG is output during the turn-on period of the switching element 311a, first outputs the gate current _IG with a large amplitude current Ig2, and then outputs the gate current IG with a small amplitude current Ig1. The gate current _IG of the current Ig1 with a small amplitude may be outputted first, and then the gate current _IG of the current Ig2 with _a large amplitude may be outputted. Similarly, the waveform shape changing unit 340 divides the period in which the gate current _IG is output during the turn-off period of the switching element 311a, first outputs the gate current IG with a large amplitude - Ig2, and then outputs the gate current _IG with a large amplitude. You may output the gate current _IG with a small current -Ig1, or first output the gate current _IG with a small amplitude current -Ig1, and then output the gate current _IG with a large amplitude current -Ig2. You can also output it.

In this way, the waveform shape changing section 340 changes the waveform shape of the switching waveform of the switching element 311a between the turn-on period and the turn-off period of the switching element 311a based on the control signal output from the waveform shape control signal output section 420. At least one period can be divided into two or more periods, and the amplitude of the gate current _IG to the switching element 311a can be changed to a different magnitude in each divided period. Further, the waveform shape changing section 340 includes a plurality of transistors, and changes the amplitude of the gate current _IG by changing the number of transistors to be operated based on the control signal output from the waveform shape control signal output section 420. can do.

Further, the waveform shape changing section 340 can change the output pattern of the gate current _IG every switching period of the switching element 311a. The waveform shape changing unit 340 can change the switching waveform to a different waveform shape every switching period of the switching element 311a while the power conversion device 1 is in operation. In this case, the waveform shape control signal output section 420 can change the waveform shape of the switching waveform of the switching element 311a at the same cycle as the switching cycle of the switching element 311a. The waveform shape control signal output unit 420 may change the waveform shape of the switching waveform of the switching element 311a at a cycle that is a positive integer multiple of the switching cycle of the switching element 311a.

Note that the configuration of the waveform shape changing unit 340 shown in FIG. 9 is an example, and the configuration of the waveform shape changing unit 340 is not limited thereto. In this way, the waveform shape changing unit 340 uses digital control using a plurality of MOSs (Metal Oxide Semiconductors), compared to analog control in which the gate resistance is physically switched as described in Patent Document 1. The switching speed of the switching element 311a can be adjusted more finely. Furthermore, the waveform shape changing section 340 may use transistors other than MOS as internally used transistors.

Further, in the above example, the waveform shape changing unit 340 changes the number of PMOSs or NMOSs to be operated according to the acquired control signal, and applies a gate current _IG to the switching element 311a according to the number of PMOSs or NMOSs to be operated. However, the output is not limited to this. The waveform shape changing unit 340 stores in advance an output pattern, that is, a waveform shape, of the gate current _IG in accordance with the control signal, and outputs the gate current _IG in the output pattern, that is, the waveform shape, in accordance with the acquired control signal. Good too. Further, the waveform shape changing unit 340 stores the control signal acquired in the past and the output pattern, that is, the waveform shape, of the gate current _IG for the control signal acquired in the past, and stores it when the same control signal is acquired. The gate current _IG may be output in the same output pattern, ie, waveform shape. The waveform shape changing unit 340 can reduce the processing load when outputting the gate current _IG by storing the output pattern, that is, the waveform shape, of the gate current _IG according to the control signal.

Further, in the example of FIG. 7, the waveform shape changing unit 340 adjusts the switching speed of the switching element 311a by changing the gate current _IG as a drive signal output to the switching element 311a, and changes the switching waveform of the switching element 311a. Although the waveform shape was changed, the present invention is not limited to this. The waveform shape changing unit 340 sets the drive signal output to the switching element 311a to a gate voltage _VG , and by changing the gate voltage _VG , similarly adjusts the switching speed of the switching element 311a, and changes the switching waveform of the switching element 311a. The waveform shape of can be changed.

In this way, the waveform shape changing section 340 changes the waveform shape of the switching waveform of the switching element 311a between the turn-on period and the turn-off period of the switching element 311a based on the control signal output from the waveform shape control signal output section 420. At least one period can be divided into two or more periods, and the amplitude of the gate voltage V _G applied to the switching element 311a can be changed to a different magnitude in each divided period. Further, the waveform shape changing unit 340 includes a plurality of transistors, and changes the amplitude of the gate voltage V _G by changing the number of transistors to be operated based on the control signal output from the waveform shape control signal output unit 420. can do.

FIG. 14 is a flowchart showing the operation of changing the waveform shape of the switching waveforms of the switching elements 311a to 311f in the power conversion device 1 according to the first embodiment. In the power conversion device 1, the basic pulse generation unit 410 generates basic pulses for driving the switching elements 311a to 311f of the inverter 310 based on the physical quantities acquired from the physical quantity detection units 501, 502, 504, 505, etc. (Step S1). In this way, in the control unit 400, the basic pulse generation unit 410 generates basic pulses based on the physical quantities acquired from the physical quantity detection units 501, 502, 504, 505, etc., and determines the timing for turning on the switching elements 311a to 311f. and determining when to turn off. The basic pulse generation section 410 outputs the generated basic pulse to the waveform shape control signal output section 420.

The waveform shape control signal output section 420 generates switching waveforms of the switching elements 311a to 311f of the inverter 310 based on the basic pulses obtained from the basic pulse generation section 410 and the physical quantities obtained from the physical quantity detection sections 501, 502, 504, and 505. Set the waveform shape to change the waveform shape. In this way, in the control section 400, the waveform shape control signal output section 420 outputs the switching elements 311a to 311f determined by the basic pulse generation section 410 based on the physical quantities acquired from the physical quantity detection sections 501, 502, 504, and 505. Set the waveform shape of the switching waveform at the turn-on timing and turn-off timing. The waveform shape control signal output section 420 outputs a control signal that can change the magnitude and output timing of the drive signal according to the set waveform shape to the waveform shape change section 340 (step S2).

The waveform shape changing unit 340 acquires the waveform shape of the gate current _IG output to the switching elements 311a to 311f of the inverter 310, that is, the waveform shape of the switching waveform of the switching elements 311a to 311f, from the waveform shape control signal output unit 420. It is changed based on the control signal (step S3). The waveform shape changing section 340 outputs the gate current _IG after changing the waveform shape to the switching elements 311a to 311f of the inverter 310.

In this embodiment, when the acquired physical quantity has a correlation with electromagnetic noise, that is, when the power converter 1 includes the physical quantity detector 501, the setting unit 421 of the waveform shape control signal output unit 420 sets the physical quantity and the power converter The waveform shape of the switching waveform of the switching elements 311a to 311f is set based on the electromagnetic noise threshold value of the electromagnetic noise allowed in 1. Further, when the acquired physical quantity has a correlation with loss, that is, when the power converter 1 includes the physical quantity detector 502, the setting unit 421 of the waveform shape control signal output unit 420 determines the physical quantity and the permissible value in the power converter 1. The waveform shape of the switching waveform of the switching elements 311a to 311f is set based on the loss threshold value of the loss. In addition, when the acquired physical quantity has a correlation with electromagnetic noise and loss, that is, when the power converter 1 includes physical quantity detection units 501, 502, 504, and 505, the setting unit 421 of the waveform shape control signal output unit 420 controls the physical quantity. , the electromagnetic noise threshold, and the loss threshold, the waveform shapes of the switching waveforms of the switching elements 311a to 311f are set.

Next, the hardware configuration of the control unit 400 included in the power conversion device 1 will be described. FIG. 15 is a diagram illustrating an example of a hardware configuration that implements the control unit 400 included in the power conversion device 1 according to the first embodiment. Control unit 400 is realized by processor 91 and memory 92.

The processor 91 is a CPU (Central Processing Unit, also referred to as a central processing unit, a processing unit, an arithmetic unit, a microprocessor, a microcomputer, a processor, a DSP (Digital Signal Processor)), or a system LSI (Large Scale Intel). gration). The memory 92 includes RAM (Random Access Memory), ROM (Read Only Memory), flash memory, EPROM (Erasable Programmable Read Only Memory), and EEP. Non-volatile or volatile memory such as ROM (registered trademark) (Electrically Erasable Programmable Read Only Memory) An example is semiconductor memory. Furthermore, the memory 92 is not limited to these, and may be a magnetic disk, an optical disk, a compact disk, a mini disk, or a DVD (Digital Versatile Disc).

As described above, according to the present embodiment, in the power conversion device 1, the waveform shape control signal output section 420 of the control section 400 responds to the physical quantities detected by the physical quantity detection sections 501, 502, 504, and 505. Then, the waveform shape changing unit 340 of the inverter 310 outputs a control signal for changing the switching waveforms of the switching elements 311a to 311f. The waveform shape changing unit 340 of the inverter 310 changes the gate current I _G or gate voltage V _G output to the switching elements 311a to 311f based on the control signal output from the waveform shape control signal output unit 420. The waveform shape of the switching waveform of the switching elements 311a to 311f is changed. Thereby, the power converter 1 can be controlled to a desired operating state by feedback control. Further, the power conversion device 1 can change the switching speed of the switching elements 311a to 311f while suppressing an increase in circuit scale. The power conversion device 1 finely adjusts the gate current _IG or gate voltage _VG output to the switching elements 311a to 311f in one switching period, thereby increasing the switching element 311a, which could not be achieved with the method of Patent Document 1, etc. It is possible to realize a switching waveform shape of ~311f.

Embodiment 2.
In the second embodiment, the waveform shape control signal output unit 420 of the power converter 1 extracts feature quantities from the physical quantities detected by the physical quantity detection units 501, 502, 504, and 505, and determines the switching waveforms of the switching elements 311a to 311f. The case of setting the waveform shape will be explained. As mentioned above, the present invention is applicable to the power converter 1 shown in FIGS. 1 to 3, but will be explained using the power converter 1 shown in FIG. 1 as an example.

FIG. 16 is a diagram showing a configuration example of the power conversion device 1 according to the second embodiment. Power conversion device 1 is connected to commercial power source 110 and motor 314. The power conversion device 1 converts the first AC power of the power supply voltage Vs supplied from the commercial power supply 110 into second AC power having a desired amplitude and phase, and supplies the second AC power to the motor 314. The power conversion device 1 includes a physical quantity detection section 501, a rectification section 130, a capacitor 210, a physical quantity detection section 502, an inverter 310, a physical quantity detection section 504, a physical quantity detection section 505, and a control section 400. . Note that the power conversion device 1 and the motor 314 constitute a motor drive device 2.

The power conversion device 1 shown in FIG. 16 differs from the power conversion device 1 shown in FIG. 1 in that the waveform shape control signal output section 420 further includes a feature amount extraction section 422. The feature extraction unit 422 extracts characteristic components from the physical quantities detected by the physical quantity detection units 501, 502, 504, and 505 as feature quantities. That is, the feature extraction unit 422 removes unnecessary components from the physical quantities detected by the physical quantity detection units 501, 502, 504, and 505.

FIG. 17 is a diagram illustrating an example of a physical quantity to be extracted by the feature quantity extracting unit 422 of the power conversion device 1 according to the second embodiment and a feature quantity after extraction. The feature extraction unit 422 extracts the feature shown on the right side of FIG. 17 from physical quantities such as electromagnetic noise shown on the left side of FIG. 17, for example. The feature amount components extracted by the feature amount extraction unit 422 are, for example, a carrier frequency, a harmonic component of the carrier frequency, an LC resonance component of an LC circuit (not shown) included in the power converter 1, and the like. The feature extraction unit 422 is configured by a filter circuit such as a high-pass filter or a band-pass filter.

In the second embodiment, the setting unit 421 of the waveform shape control signal output unit 420 sets the switching elements 311a to 311f when changing in the waveform shape changing unit 340 according to the feature extracted by the feature extracting unit 422. The waveform shape of the switching waveform is set, and a control signal indicating the set waveform shape is output.

In the power converter 1, the waveform shape control signal output unit 420 uses the feature quantities from which unnecessary components are removed from the physical quantities detected by the physical quantity detection units 501, 502, 504, and 505 to generate the waveform shape control signal in the waveform shape modification unit 340. It is possible to set the waveform shape of the switching waveform of the switching elements 311a to 311f when changing, and output a control signal indicating the set waveform shape. As a result, the power converter 1 according to the second embodiment has higher accuracy than the power converter 1 according to the first embodiment according to the physical quantities detected by the physical quantity detection units 501, 502, 504, and 505. , it is possible to set the waveform shape of the switching waveform of the switching elements 311a to 311f when changing the switching waveform of the switching elements 311a to 311f, and output a control signal indicating the set waveform shape.

Embodiment 3.
In Embodiment 3, a case will be described in which the waveform shape control signal output unit 420 of the power converter 1 stores past operation history and diagnoses the operating state of the power converter 1. As mentioned above, the present invention is applicable to the power converter 1 shown in FIGS. 1 to 3, but will be explained using the power converter 1 shown in FIG. 1 as an example.

FIG. 18 is a diagram showing a configuration example of the power conversion device 1 according to the third embodiment. Power conversion device 1 is connected to commercial power source 110 and motor 314. The power conversion device 1 converts the first AC power of the power supply voltage Vs supplied from the commercial power supply 110 into second AC power having a desired amplitude and phase, and supplies the second AC power to the motor 314. The power conversion device 1 includes a physical quantity detection section 501, a rectification section 130, a capacitor 210, a physical quantity detection section 502, an inverter 310, a physical quantity detection section 504, a physical quantity detection section 505, and a control section 400. . Note that the power conversion device 1 and the motor 314 constitute a motor drive device 2.

The power conversion device 1 shown in FIG. 18 differs from the power conversion device 1 shown in FIG. 1 in that the waveform shape control signal output section 420 further includes a storage section 423 and a state diagnosis section 424. The storage unit 423 stores the first physical quantity, which is the physical quantity detected by the physical quantity detection units 501, 502, 504, and 505, as a second physical quantity. Furthermore, the storage unit 423 stores the first waveform shape, which is the waveform shape of the switching waveform of the switching elements 311a to 311f set by the setting unit 421 at the time of the first physical quantity, as the second waveform shape. Stored in association with a physical quantity. Thereby, the power conversion device 1 of Embodiment 3 can output information such as the past operation history of the power conversion device 1 to the outside.

The state diagnosis unit 424 detects the first physical quantity detected by the physical quantity detection units 501, 502, 504, and 505 and a waveform shape that is the same as the first waveform shape set by the setting unit 421 according to the first physical quantity. The operating state of the power conversion device 1 is diagnosed based on the second physical quantity stored in the storage unit 423 in association with the second waveform shape. The condition diagnosis section 424 controls the output of a control signal indicating the set waveform shape from the setting section 421 to the waveform shape changing section 340, depending on the diagnosis result.

That is, the state diagnosis unit 424 uses the past physical quantity when the second waveform shape is the same waveform shape as the first waveform shape currently set by the setting unit 421. A certain second physical quantity is read from the storage unit 423, and the first physical quantity, which is the current physical quantity, is compared with the second physical quantity. As a result of comparing the first physical quantity and the second physical quantity, if the difference exceeds a prescribed threshold value, the state diagnosis unit 424 determines that some change, that is, an abnormality has occurred in the power conversion device 1, and changes the waveform shape. The output of the control signal from the control signal output section 420, that is, the setting section 421 to the waveform shape changing section 340 is controlled to be stopped. As a result of comparing the first physical quantity and the second physical quantity, if the difference is within a prescribed threshold value, the state diagnosis unit 424 determines that there is no change in the power conversion device 1, that is, no abnormality has occurred. It is determined that there is no waveform shape control signal, and control is performed to continue outputting the control signal from the waveform shape control signal output section 420, that is, the setting section 421 to the waveform shape modification section 340. The condition diagnostic unit 424 performs the above-described diagnosis at a prescribed cycle.

Specifically, when the physical quantity detected by the physical quantity detection unit 501 is common mode noise, the state diagnosis unit 424 can detect a change in common mode impedance in the power conversion device 1 as a difference. Examples of cases in which there is a change in common mode impedance include a change in parasitic capacitance such as a load, a failure in the physical quantity detection units 501, 502, 504, and 505, a case in which a snubber circuit element (not shown) deteriorates, etc. be. The case where the parasitic capacitance such as the load changes is the case where the structure inside the compressor (not shown) including the motor 314 changes, the case where the dielectric constant changes due to refrigerant stagnation in the product in which the power converter 1 is mounted, etc. The state diagnosis section 424 can also detect a case where the waveform shape changing section 340 has failed.

Note that in the present embodiment, the storage unit 423 further stores, as second operation information, first operation information that is the operation information of the inverter 310 acquired from the basic pulse generation unit 410 that controls the operation of the inverter 310. It may be stored in association with the second physical quantity and the second waveform shape. The operation information of the inverter 310 is, for example, a basic pulse generated by the basic pulse generation unit 410, but may include information other than the basic pulse.

In this case, the state diagnosis unit 424 detects the first physical quantity detected by the physical quantity detection units 501, 502, 504, and 505, and the first physical quantity set by the setting unit 421 according to the first physical quantity and the first operation information. The operating state of the power conversion device 1 is diagnosed based on a second waveform shape having the same waveform shape as the first waveform shape, and a second physical quantity stored in the storage unit 423 in association with the second operation information. do. The condition diagnosis section 424 controls the output of a control signal indicating the set waveform shape from the setting section 421 to the waveform shape changing section 340, depending on the diagnosis result.

In other words, the condition diagnosis unit 424 determines when the second waveform shape is a past waveform shape that is the same as the first waveform shape that is the waveform shape currently set by the setting unit 421, and when the current operation A second physical quantity that is a past physical quantity at the time of second driving information that is past driving information that is the same as the first driving information that is information is read from the storage unit 423, and is Compare with the second physical quantity. As a result of comparing the first physical quantity and the second physical quantity, if the difference exceeds a prescribed threshold value, the state diagnosis unit 424 determines that some change, that is, an abnormality has occurred in the power conversion device 1, and changes the waveform shape. The output of the control signal from the control signal output section 420, that is, the setting section 421 to the waveform shape changing section 340 is controlled to be stopped. As a result of comparing the first physical quantity and the second physical quantity, if the difference is within a prescribed threshold value, the state diagnosis unit 424 determines that there is no change in the power conversion device 1, that is, no abnormality has occurred. It is determined that there is no waveform shape control signal, and control is performed to continue outputting the control signal from the waveform shape control signal output section 420, that is, the setting section 421 to the waveform shape modification section 340. The condition diagnostic unit 424 performs the above-described diagnosis at a prescribed cycle.

Note that the state diagnosis unit 424 is not limited to using one threshold value when determining whether or not an abnormality has occurred, and may use a plurality of threshold values. By using a plurality of threshold values, the state diagnosis unit 424 can distinguish the degree of an occurring abnormality, such as a failure, into a minor failure, a major failure, or the like. For example, if the condition diagnosis unit 424 determines that there is a minor failure, the condition diagnosis unit 424 does not stop outputting the control signal from the setting unit 421 to the waveform shape changing unit 340, returns the output of the control signal to the initial value, and performs feedback control again. Alternatively, the output of the control signal may be fixed and the operation of the power conversion device 1 may be continued. Further, the state diagnosis unit 424 may determine that a major failure has occurred when the number of times that a minor failure has been determined reaches a predetermined number of times. If the condition diagnosis unit 424 determines that there is a serious failure, it controls the setting unit 421 to stop outputting the control signal to the waveform shape changing unit 340, as described above.

In this way, the power converter 1 of the third embodiment can quickly stop the operation of the inverter 310 when an abnormality occurring in the power converter 1 is detected.

Embodiment 4.
In the fourth embodiment, a case will be described in which the waveform shape control signal output section 420 of the power converter 1 includes a feature extraction section 422, a storage section 423, and a state diagnosis section 424. As mentioned above, the present invention is applicable to the power converter 1 shown in FIGS. 1 to 3, but will be explained using the power converter 1 shown in FIG. 1 as an example.

FIG. 19 is a diagram showing a configuration example of the power converter 1 according to the fourth embodiment. Power conversion device 1 is connected to commercial power source 110 and motor 314. The power conversion device 1 converts the first AC power of the power supply voltage Vs supplied from the commercial power supply 110 into second AC power having a desired amplitude and phase, and supplies the second AC power to the motor 314. The power conversion device 1 includes a physical quantity detection section 501, a rectification section 130, a capacitor 210, a physical quantity detection section 502, an inverter 310, a physical quantity detection section 504, a physical quantity detection section 505, and a control section 400. . Note that the power conversion device 1 and the motor 314 constitute a motor drive device 2.

In the power conversion device 1 shown in FIG. 19, compared to the power conversion device 1 shown in FIG. The difference is in the preparation. The feature extraction unit 422 is similar to the feature extraction unit 422 described in the second embodiment. The storage unit 423 and the state diagnosis unit 424 are similar to the storage unit 423 and the state diagnosis unit 424 described in the third embodiment, except that a part of the target is different, that is, the target is changed from a physical quantity to a feature quantity. be.

That is, in this embodiment, the storage unit 423 stores the first feature amount, which is the feature amount extracted by the feature amount extraction unit 422, as the second feature amount. Furthermore, the storage unit 423 stores the first waveform shape, which is the waveform shape of the switching waveform of the switching elements 311a to 311f set by the setting unit 421 at the time of the first feature amount, as the second waveform shape. Stored in association with the feature amount. Thereby, the power conversion device 1 of the fourth embodiment can output information such as the past operation history of the power conversion device 1 to the outside.

The state diagnosis unit 424 uses the first feature extracted by the feature extraction unit 422 and a second waveform having the same waveform shape as the first waveform set by the setting unit 421 according to the first feature. The operating state of the power conversion device 1 is diagnosed based on the second feature amount stored in the storage unit 423 in association with the waveform shape. The condition diagnosis section 424 controls the output of a control signal indicating the set waveform shape from the setting section 421 to the waveform shape changing section 340, depending on the diagnosis result.

Note that in the present embodiment, the storage unit 423 further stores, as second operation information, first operation information that is the operation information of the inverter 310 acquired from the basic pulse generation unit 410 that controls the operation of the inverter 310. It may be stored in association with the second feature amount and the second waveform shape. The operation information of the inverter 310 is, for example, a basic pulse generated by the basic pulse generation unit 410, but may include information other than the basic pulse.

In this case, the state diagnosis unit 424 uses the first feature extracted by the feature extraction unit 422 and the first waveform set by the setting unit 421 according to the first feature and the first driving information. The operating state of the power conversion device 1 is diagnosed based on the second waveform shape having the same waveform shape as the shape and the second feature amount stored in the storage unit 423 in association with the second operation information. The state diagnosis section 424 controls the output of a control signal indicating the set waveform shape from the setting section 421 to the waveform shape changing section 340.

In this manner, the power converter 1 of the fourth embodiment can quickly stop the operation of the inverter 310 when an abnormality occurring in the power converter 1 is detected.

Embodiment 5.
In Embodiment 5, a specific configuration of physical quantity detection section 501 included in power conversion device 1 will be described. As described above, the present invention is applicable to the power conversion device 1 shown in FIGS. 1 and 2, but will be explained using the power conversion device 1 shown in FIG. 1 as an example.

FIG. 20 is a diagram showing a configuration example of the power conversion device 1 according to the fifth embodiment. Power conversion device 1 is connected to commercial power source 110 and motor 314. The power conversion device 1 converts the first AC power of the power supply voltage Vs supplied from the commercial power supply 110 into second AC power having a desired amplitude and phase, and supplies the second AC power to the motor 314. The power conversion device 1 includes a physical quantity detection section 501, a rectification section 130, a capacitor 210, a physical quantity detection section 502, an inverter 310, a physical quantity detection section 504, a physical quantity detection section 505, and a control section 400. . Note that the power conversion device 1 and the motor 314 constitute a motor drive device 2.

The physical quantity detection unit 501 is configured by a common mode transformer. The physical quantity detection unit 501 is, for example, a toroidal core of a common mode choke coil of a filter circuit to which a detection winding is newly added. FIG. 21 is a diagram showing an image of the toroidal core 510 portion of the physical quantity detection unit 501 of the power conversion device 1 according to the fifth embodiment. FIG. 21 shows a state in which a detection winding is added to the toroidal core 510 in addition to the R-phase, S-phase, and T-phase windings. With such a configuration, the physical quantity detection section 501 can serve as both a filter element and a physical quantity detection section.

Embodiment 6.
In the power conversion device 1 of Embodiment 1 to Embodiment 5, the waveform shape control signal output unit 420 uses the learning results obtained by machine learning to control the switching of the switching elements 311a to 311f by the waveform shape changing unit 340. It is also possible to set the waveform shape of the waveform.

Embodiment 7.
A case will be described in which an adaptive observer is applied as sensorless control of the motor 314 in the power conversion device 1 of Embodiment 1 to Embodiment 6. Specifically, the power conversion device 1 of Embodiment 1 will be explained as an example.

FIG. 22 is a diagram illustrating a configuration example of power conversion device 1 according to Embodiment 7. A power conversion device 1 according to the seventh embodiment shown in FIG. 22 is obtained by adding a physical quantity detection unit 503 and a speed estimation device 101 to the power conversion device 1 according to the first embodiment shown in FIG. Note that in FIG. 22, the description of the control unit 400 in the power conversion device 1 is simplified. The physical quantity detection unit 503 has the same function as the physical quantity detection unit 501 and the like. FIG. 23 is a diagram illustrating a configuration example of speed estimating device 101 included in power conversion device 1 according to Embodiment 7. The speed estimating device 101 estimates the rotational speed of the motor 314 using the voltage vector and current vector applied to the motor 314 using an adaptive observer method, and outputs it as an estimated angular speed ω^ _r .

The speed estimating device 101 includes a model deviation calculation unit 11 that calculates a model deviation ε based on a voltage vector, a current vector, and an estimated angular velocity ω^ _r , and a first and a first angular velocity estimation unit 21 that calculates the estimated angular velocity ω^ _r1 . The speed estimating device 101 also includes a second angular velocity estimator 22 that calculates a second estimated angular velocity ω^ _r2 as a high frequency component of the actual angular velocity based on a specific high frequency component included in the model deviation ε, and a first estimated angular velocity and an adder 23 that calculates the estimated angular velocity ω^ _r by adding the second estimated angular velocity ω^ _r2 to the angular velocity ω^ _r1 . The velocity estimating device 101 is characterized in that it includes a second angular velocity estimating section 22. The speed estimation device 101 feeds back the sum of the first estimated angular velocity ω^ _r1 and the second estimated angular velocity ω^ _r2 to the model deviation calculation unit 11 as the estimated angular velocity ω^ _r .

The model deviation calculation unit 11 includes a current estimator 12 that calculates and outputs an estimated magnetic flux vector and an estimated current vector based on the voltage vector, current vector, and estimated angular velocity ω^ _r of the motor 314, and a current estimator 12 that calculates and outputs an estimated magnetic flux vector and an estimated current vector, and a current vector that calculates a current vector from the estimated current vector. a subtracter 13 that calculates and outputs a current deviation vector; and a deviation calculator 14 that receives the current deviation vector, extracts the orthogonal component of the estimated magnetic flux vector as a scalar quantity, and outputs this value as a model deviation ε. , is provided. There are two methods to extract the orthogonal component of the estimated magnetic flux vector as a scalar quantity: one is to transform the coordinates of the current deviation vector onto two rotating axes, and the other is to calculate the size of the cross product of the current deviation vector and the estimated magnetic flux vector. is publicly known.

The current estimator 12 estimates the current and magnetic flux from the state equation of the motor 314. Here, it is assumed that the motor 314 is a general embedded magnet type synchronous AC motor, but even if the motor 314 is other than an embedded magnet type synchronous AC motor, the current estimator 12 can be used in the same manner as long as the state equation can be formulated. The current can be estimated using the following method. Examples of the motor 314 other than the embedded magnet type synchronous AC motor include a surface magnet type synchronous motor, an induction motor, and the like. Further, in this embodiment, a rotary motor will be described, but the same technique can also be applied to a direct drive motor. The reason is that a direct-acting motor can be interpreted as a rotary motor with an infinite rotor radius.

In this way, the power conversion device 1 can apply the adaptive observer as sensorless control of the motor 314.

Embodiment 8.
In the power conversion device 1 of Embodiment 1 to Embodiment 6, a case will be described in which control is performed to suppress deterioration of smoothing capacitor 210 and to suppress enlargement of the device. Specifically, the power conversion device 1 of Embodiment 1 will be explained as an example.

FIG. 24 is a diagram illustrating a configuration example of the power conversion device 1 according to the eighth embodiment. The configuration of the power converter 1 according to the eighth embodiment shown in FIG. 24 is the same as that of the power converter 1 according to the first embodiment shown in FIG. As described above, the rectifier 130 has a bridge circuit configured by a rectifier (not shown), and rectifies and outputs the first AC power of the power supply voltage Vs supplied from the commercial power supply 110.

In the present embodiment, the control unit 400 controls the inverter 310 so that the second AC power including pulsations corresponding to the pulsations of the power flowing into the capacitor 210 from the rectifying unit 130 is output from the inverter 310 to the motor 314 that is a load. control the behavior of The pulsation corresponding to the pulsation of the power flowing into the capacitor 210 is a pulsation that varies depending on the frequency of the pulsation of the power flowing into the capacitor 210, for example. Thereby, the control unit 400 suppresses the current flowing through the capacitor 210. Note that the control unit 400 does not need to use all of the detection values obtained from each detection unit, and may perform control using some of the detection values.

The operation of the control unit 400 included in the power conversion device 1 will be described. In this embodiment, in the power converter 1, the load generated by the inverter 310 and the motor 314 can be considered as a constant load, and when viewed from the current output from the capacitor 210, the capacitor 210 has a constant current load. The following explanation will be given assuming that they are connected. Here, as shown in FIG. 24, the current flowing from the rectifier 130 is defined as a current I1, the current flowing through the inverter 310 is defined as a current I2, and the current flowing from the capacitor 210 is defined as a current I3. The current I2 is a combination of the current I1 and the current I3. Current I3 can be expressed as the difference between current I2 and current I1, ie, current I2-current I1. The current I3 has a positive direction in which the capacitor 210 is discharged, and a negative direction in which the capacitor 210 is charged. That is, current may flow into the capacitor 210, and current may flow out of the capacitor 210.

As a comparative example, FIG. 25 shows an example of each of the currents I1 to I3 and the capacitor voltage Vdc of the capacitor 210 when the current output from the rectifier 130 is smoothed by the capacitor 210 and the current I2 flowing to the inverter 310 is kept constant. FIG. From the top, current I1, current I2, current I3, and capacitor voltage Vdc of capacitor 210 generated in response to current I3 are shown. The vertical axes of currents I1, I2, and I3 indicate current values, and the vertical axis of capacitor voltage Vdc indicates voltage values. All horizontal axes indicate time t. Note that the carrier components of the inverter 310 are actually superimposed on the currents I2 and I3, but this is omitted here. The same shall apply thereafter. As shown in FIG. 25, in the power conversion device 1, if the current I1 flowing from the rectifier 130 is sufficiently smoothed by the capacitor 210, the current I2 flowing to the inverter 310 has a constant current value. However, a large current I3 flows through the capacitor 210, causing deterioration. Therefore, in the present embodiment, in power conversion device 1, control unit 400 controls current I2 flowing through inverter 310, that is, controls the operation of inverter 310, so as to reduce current I3 flowing through capacitor 210.

FIG. 26 shows currents I1 to I3 and capacitor voltage Vdc of capacitor 210 when control unit 400 of power converter 1 according to Embodiment 8 controls the operation of inverter 310 to reduce current I3 flowing to capacitor 210. FIG. From the top, current I1, current I2, current I3, and capacitor voltage Vdc of capacitor 210 generated in response to current I3 are shown. The vertical axes of currents I1, I2, and I3 indicate current values, and the vertical axis of capacitor voltage Vdc indicates voltage values. All horizontal axes indicate time t. The control unit 400 of the power conversion device 1 controls the operation of the inverter 310 so that the current I2 as shown in FIG. The frequency component of the current flowing into the capacitor 210 can be reduced, and the current I3 flowing into the capacitor 210 can be reduced. Specifically, the control unit 400 controls the operation of the inverter 310 so that a current I2 including a pulsating current whose main component is the frequency component of the current I1 flows through the inverter 310.

In this manner, in the power conversion device 1, the control unit 400 determines that the pulsation according to the physical quantities detected by the physical quantity detection units 501 to 505 is the drive pattern of the motor 314 connected to the inverter 310 from the inverter 310, which is a power converter. The operation of inverter 310 is controlled so that the charging and discharging current of capacitor 210 is suppressed. Thereby, the power conversion device 1 can suppress deterioration of the smoothing capacitor 210.

Embodiment 9.
In the power conversion device 1 of Embodiment 1 to Embodiment 6, it is possible to suppress fluctuations in DC voltage even when changing the number of times of switching of a short-circuit part that short-circuits commercial power supply 110, which is an AC power supply, in accordance with load conditions. A case will be explained in which control is possible. Specifically, the power conversion device 1 of Embodiment 1 will be explained as an example.

FIG. 27 is a diagram illustrating a configuration example of power conversion device 1 according to Embodiment 9. In the power converter 1 of the ninth embodiment shown in FIG. 27, the commercial power source 110 connected is changed from the three-phase AC power source to the single-phase AC power source, compared to the power converter device 1 of the first embodiment shown in FIG. are doing. Further, a power converter 1 according to the ninth embodiment shown in FIG. 27 is obtained by adding a reactor 135 and a short circuit section 30 to the power converter 1 according to the first embodiment shown in FIG. Reactor 135 is connected between commercial power supply 110 and rectifier 130 . The rectifier 130 rectifies and outputs the first AC power supplied from the commercial power source 110.

The shorting section 30 short-circuits the commercial power supply 110 via the reactor 135. The shorting section 30 includes a diode bridge 31 connected in parallel to the commercial power supply 110 via a reactor 135, and a shorting element 32 connected to both output ends of the diode bridge 31. When the shorting element 32 is a metal oxide semiconductor field effect transistor, the gate of the shorting element 32 is connected to the control section 400, and the shorting element 32 is turned on and off by a drive signal from the control section 400. When the shorting element 32 is turned on, the commercial power supply 110 is short-circuited via the reactor 135 and the diode bridge 31.

The control unit 400 controls the short circuit operation of the short circuit unit 30. The control unit 400 controls the on/off of the short circuit element 32 by current open loop control in the short circuit operation mode so that the short circuit unit 30 is short circuited at least twice or more during a half cycle of the power supply. The control unit 400 short-circuits the short circuit unit 30 at least twice during a half cycle of the commercial power supply 110 based on the load condition. Thereby, the power conversion device 1 can suppress fluctuations in the DC voltage even when changing the number of times the shorting section 30 that shorts the commercial power source 110 is switched in accordance with the load condition.

Embodiment 10.
In Embodiment 10, the rectifier 130 of the power converter 1 includes a waveform shape changing section, and the waveform shape control signal output section 420 also outputs a waveform shape control signal to the waveform shape changing section of the rectifier 130. I will explain about it. Although the power conversion device 1 of FIG. 1 of the first embodiment will be described as an example, it is also applicable to the power conversion device 1 of other embodiments.

FIG. 28 is a diagram showing a configuration example of the power conversion device 1 according to the tenth embodiment. In the power conversion device 1, the rectifier 130 includes rectifying elements 131a to 131f, reactors 135a to 135c, a switching element 136, a freewheeling diode 137, a diode 138, and a waveform shape changing unit 140. The rectifier 130 rectifies the first AC power of the power supply voltage Vs supplied from the commercial power supply 110 using the rectifier elements 131a to 131f, and boosts and outputs the rectified DC power. The waveform shape changing section 140 has the same function as the waveform shape changing section 340 of the inverter 310. The switching element 136 is, for example, an IGBT, a MOSFET, a bipolar transistor, etc., but is not limited thereto. Note that the configuration of the rectifier 130 is not limited to the example shown in FIG. 28. In the rectifying section 130, one or more of the rectifying elements 131a to 131f may be configured with a switching element. The power conversion device 1 also includes a physical quantity detection unit similar to the physical quantity detection unit 502 around the switching element 136, that is, a physical quantity that detects a physical quantity correlated with the loss generated in the power conversion device 1 due to switching of the switching element 136. It may also include a detection section.

The basic pulse generation section 410 outputs a basic pulse for controlling the operation of the switching element 136 of the rectification section 130 to the waveform shape control signal output section 420. Waveform shape control signal output section 420 outputs a control signal for controlling the operation of waveform shape modification section 140 to waveform shape modification section 140 . In this embodiment, the waveform shape control signal output section 420 controls the switching waveform of the switching element 136 in the waveform shape changing section 140 of the rectifying section 130 according to the physical quantities detected by the physical quantity detecting sections 501, 502, 504, and 505. The waveform shape of the switching waveform of the switching element 136 when changing is set, and a control signal indicating the set waveform shape is output. Specifically, when the waveform shape control signal output unit 420 turns on and off the switching element 136 based on the basic pulse for controlling the operation of the switching element 136 of the rectifier 130, which is generated by the basic pulse generation unit 410, The waveform shape changing unit 140 of the rectifying unit 130 controls the magnitude of the drive signal output to the switching element 136 and the timing of outputting the drive signal in order to actually drive the switching element 136. Waveform shape control signal output section 420 outputs a control signal for controlling the operation of waveform shape modification section 140 to waveform shape modification section 140 .

The waveform shape changing unit 140 can change the waveform shape of the switching waveform of the switching element 136. The waveform shape changing section 140 can output two or more waveform shapes as the waveform shape of the switching waveform of the switching element 136. Further, the waveform shape changing section 140 is included in the rectifying section 130, which is a power converter including a switching element 136, as shown in FIG. The configuration of waveform shape changing section 140 is similar to the configuration of waveform shape changing section 340 of Embodiment 1 shown in FIG. That is, the waveform shape changing section 140 and the switching element 136 are configured by one digital gate driver module. Further, like the waveform shape changing unit 340, the waveform shape changing unit 140 may adjust the gate voltage _VG output to the switching element 136 instead of the gate current _IG outputting to the switching element 136 as a drive signal. .

In this way, the waveform shape changing section 140 changes the waveform shape of the switching waveform of the switching element 136 between the turn-on period and the turn-off period of the switching element 136 based on the control signal output from the waveform shape control signal output section 420. At least one period can be divided into two or more periods, and the amplitude of the gate current _IG or gate voltage _VG applied to the switching element 136 can be changed to a different magnitude in each divided period. In addition, the waveform shape changing section 140 includes a plurality of transistors, and changes the number of transistors to be operated based on the control signal output from the waveform shape control signal output section 420, thereby increasing the gate current _IG or the gate voltage V. The amplitude of _G can be changed. Thereby, by performing the same operation as in the first embodiment, the power converter 1 changes the waveform shape of the switching waveform of the switching element 136 of the rectifier 130 by the waveform shape control signal output section 420 and the waveform shape changing section 140. can be changed. Further, the power conversion device 1 can change noise and loss generated in the switching element 136 according to physical quantities.

As described above, according to the present embodiment, in the power conversion device 1, the waveform shape control signal output section 420 of the control section 400 responds to the physical quantities detected by the physical quantity detection sections 501, 502, 504, and 505. Then, the waveform shape changing section 140 of the rectifying section 130 outputs a control signal when changing the switching waveform of the switching element 136. The waveform shape changing section 140 of the rectifying section 130 changes the gate current _IG or gate voltage _VG output to the switching element 136 based on the control signal output from the waveform shape control signal output section 420, thereby performing switching. The waveform shape of the switching waveform of the element 136 is changed. The waveform shape changing section 140 can change the waveform shape of the switching waveform of the switching element 136 in the same way that the waveform shape changing section 340 of the first embodiment changes the waveform shape of the switching waveform of the switching element 311a. can. Thereby, the power converter 1 can be controlled to a desired operating state by feedback control. Moreover, the power conversion device 1 can change the switching speed of the switching element 136 while suppressing an increase in circuit scale. The power conversion device 1 finely adjusts the gate current _IG or gate voltage _VG output to the switching element 136 in one switching period, thereby achieving switching of the switching element 136 that could not be achieved with the method disclosed in Patent Document 1. A waveform shape of a waveform can be realized.

Embodiment 11.
FIG. 29 is a diagram showing a configuration example of a refrigeration cycle application device 900 according to the eleventh embodiment. Refrigeration cycle application equipment 900 according to Embodiment 11 includes power conversion device 1 described in Embodiment 1. Refrigeration cycle application equipment 900 according to Embodiment 11 can also include power conversion device 1 described in Embodiments 2 to 6. The refrigeration cycle application device 900 according to Embodiment 11 can be applied to products equipped with a refrigeration cycle, such as air conditioners, refrigerators, freezers, and heat pump water heaters. Note that in FIG. 29, components having the same functions as in the first embodiment are given the same reference numerals as in the first embodiment.

Refrigeration cycle application equipment 900 includes a compressor 315 with built-in motor 314 in Embodiment 1, a four-way valve 902, an indoor heat exchanger 906, an expansion valve 908, and an outdoor heat exchanger 910 that connect refrigerant piping 912. It is attached through.

A compression mechanism 904 that compresses the refrigerant and a motor 314 that operates the compression mechanism 904 are provided inside the compressor 315.

The refrigeration cycle applicable equipment 900 can perform heating operation or cooling operation by switching the four-way valve 902. The compression mechanism 904 is driven by a variable speed controlled motor 314.

During heating operation, as shown by the solid arrow, the refrigerant is pressurized by the compression mechanism 904 and sent out, passing through the four-way valve 902, indoor heat exchanger 906, expansion valve 908, outdoor heat exchanger 910, and four-way valve 902. Returning to the compression mechanism 904.

During cooling operation, the refrigerant is pressurized by the compression mechanism 904 and sent out, passing through the four-way valve 902, the outdoor heat exchanger 910, the expansion valve 908, the indoor heat exchanger 906, and the four-way valve 902, as shown by the dashed arrow. Returning to the compression mechanism 904.

During heating operation, the indoor heat exchanger 906 acts as a condenser and releases heat, and the outdoor heat exchanger 910 acts as an evaporator and absorbs heat. During cooling operation, the outdoor heat exchanger 910 acts as a condenser and releases heat, and the indoor heat exchanger 906 acts as an evaporator and absorbs heat. The expansion valve 908 reduces the pressure of the refrigerant and expands it.

Note that even if the refrigeration cycle application equipment 900 is operated within a specified noise range, when the load state of the motor 314 changes from light load to heavy load, switching elements 311a to 311f are activated as shown in FIG. The curve showing the characteristics of the noise and loss generated in such cases moves toward the upper right, resulting in an increase in noise. Therefore, the refrigeration cycle application equipment 900 can reduce the noise generated in the switching elements 311a to 311f by slowing down the switching speed of the switching elements 311a to 311f. Similarly, even if the refrigeration cycle application equipment 900 is operated within the specified loss range, when the load state of the motor 314 changes from light load to heavy load, the switching elements 311a to 311a as shown in FIG. The curve showing the characteristics of noise and loss generated in 311f and the like moves toward the upper right, resulting in an increase in loss. Therefore, the refrigeration cycle applicable equipment 900 can reduce the loss generated in the switching elements 311a to 311f by increasing the switching speed of the switching elements 311a to 311f.

Here, in the power conversion device 1 included in the refrigeration cycle application equipment 900, the digital gate driver module configured by the waveform shape changing section 340 and the switching elements 311a to 311f included in the inverter 310 has a high switching speed and a surge voltage. becomes larger and generates more electromagnetic noise. When the refrigeration cycle application equipment 900 uses a combustible refrigerant, there is a possibility that the refrigerant will burn due to discharge caused by electromagnetic noise when the refrigerant leaks. Therefore, the refrigeration cycle application equipment 900 sets the switching speed of the digital gate driver module included in the power conversion device 1 according to the combustibility of the refrigerant used in the refrigeration cycle application equipment 900. For example, the refrigeration cycle application equipment 900 decreases the switching speed of the digital gate driver module included in the power converter 1 as the flammability of the refrigerant used in the refrigeration cycle application equipment 900 increases. The refrigeration cycle application equipment 900 can reduce the surge voltage by slowing down the switching speed of the digital gate driver module, and by suppressing the occurrence of discharge caused by electromagnetic noise, even if refrigerant leaks from the refrigeration cycle application equipment 900. It is possible to prevent combustion even in some cases.

Refrigerants used in the refrigeration cycle application equipment 900 include, for example, R1234yf, R1234ze (E), R1243zf, HFO1123, HFO1132 (E), R1132a, CF3I, R290, R463A, R466A, R454A, R454B, and R454C.

The configurations shown in the embodiments above are merely examples, and can be combined with other known techniques, or can be combined with other embodiments, within the scope of the gist. It is also possible to omit or change part of the configuration.

1 power conversion device, 2 motor drive device, 11 model deviation calculation unit, 12 current estimator, 13 subtractor, 14 deviation calculation unit, 21 first angular velocity estimation unit, 22 second angular velocity estimation unit, 23 adder, 30 Short circuit part, 31 Diode bridge, 32 Short circuit element, 101 Speed estimation device, 110 Commercial power supply, 130 Rectifier part, 131a to 131f Rectifier element, 135, 135a to 135c Reactor, 136, 311a to 311f Switching element, 137, 3 12a~ 312f Freewheeling diode, 138 Diode, 140, 340 Waveform shape changing section, 210 Capacitor, 310 Inverter, 314 Motor, 315 Compressor, 400 Control section, 410 Basic pulse generation section, 420 Waveform shape control signal output section, 421 Setting section, 422 Feature extraction unit, 423 Storage unit, 424 State diagnosis unit, 501 to 505 Physical quantity detection unit, 510 Toroidal core, 900 Refrigeration cycle application equipment, 902 Four-way valve, 904 Compression mechanism, 906 Indoor heat exchanger, 908 Expansion valve, 910 Outdoor heat exchanger, 912 Refrigerant piping.

Claims (20)

1. A power conversion device that performs power conversion,
   One or more switching elements included in an inverter that converts DC power to AC power;
   a waveform shape changing section capable of changing the waveform shape of the switching waveform of the switching element;
   a physical quantity detection unit that detects a physical quantity correlated with at least one of electromagnetic noise and loss generated in the power converter due to switching of the switching element;
   a waveform shape control signal output unit that outputs a control signal when changing the switching waveform of the switching element in the waveform shape changing unit according to the physical quantity;
   A power conversion device comprising:
2. The waveform shape control signal output section includes:
   when the physical quantity has a correlation with the electromagnetic noise, changing the waveform shape of the switching waveform of the switching element based on the physical quantity and an electromagnetic noise threshold of the electromagnetic noise allowed in the power converter;
   when the physical quantity has a correlation with the loss, changing the waveform shape of the switching waveform of the switching element based on the physical quantity and a loss threshold of the loss allowed in the power conversion device;
   a setting unit that changes the waveform shape of the switching waveform of the switching element based on the physical quantity, the electromagnetic noise threshold, and the loss threshold when the physical quantity has a correlation with the electromagnetic noise and the loss;
   The power conversion device according to claim 1, comprising:
3. The waveform shape control signal output section includes:
   a feature extraction unit that extracts a feature from the physical quantity;
   Equipped with
   The setting unit sets a waveform shape of the switching waveform of the switching element when changed by the waveform shape changing unit, according to the feature amount.
   The power conversion device according to claim 2.
4. The waveform shape control signal output section includes:
   A first physical quantity, which is the physical quantity detected by the physical quantity detection unit, is stored as a second physical quantity, and a waveform shape of the switching waveform of the switching element set by the setting unit when the first physical quantity is the first physical quantity. a storage unit that stores a first waveform shape as a second waveform shape in association with the second physical quantity;
   The power conversion device according to claim 2, comprising:
5. The waveform shape control signal output section includes:
   The first physical quantity detected by the physical quantity detection unit is associated with the second waveform shape having the same waveform shape as the first waveform shape set by the setting unit according to the first physical quantity. and the second physical quantity stored in the storage unit, the operating state of the power conversion device is diagnosed, and the control unit indicates the set waveform shape from the setting unit to the waveform shape changing unit. a status diagnostic unit that controls signal output;
   The power conversion device according to claim 4, comprising:
6. The storage unit further stores first operation information, which is operation information of the inverter, as second operation information in association with the second physical quantity and the second waveform shape,
   The waveform shape control signal output section further includes:
   The first physical quantity detected by the physical quantity detection unit, and the first waveform having the same waveform shape as the first waveform shape set by the setting unit according to the first physical quantity and the first operation information. The operating state of the power converter is diagnosed based on the waveform shape of 2 and the second physical quantity stored in the storage unit in association with the second operating information, and the waveform shape is determined from the setting unit. a state diagnosis unit that controls output of the control signal indicating the set waveform shape to the shape change unit;
   The power conversion device according to claim 4, comprising:
7. The waveform shape control signal output section includes:
   A first feature amount, which is the feature amount extracted by the feature amount extracting unit, is stored as a second feature amount, and when the first feature amount is the feature amount, the first feature amount, which is the feature amount, is a storage unit that stores a first waveform shape, which is a waveform shape of a switching waveform, as a second waveform shape in association with the second feature amount;
   The power conversion device according to claim 3, comprising:
8. The waveform shape control signal output section includes:
   the first feature amount extracted by the feature amount extraction unit; and the second waveform shape having the same waveform shape as the first waveform shape set by the setting unit according to the first feature amount. The operating state of the power conversion device is diagnosed based on the second feature quantity stored in the storage unit in association with a state diagnosis unit that controls the output of the control signal indicating
   The power conversion device according to claim 7, comprising:
9. The storage unit further stores first operating information, which is operating information of the inverter, as second operating information in association with the second feature amount and the second waveform shape,
   The waveform shape control signal output section further includes:
   a waveform shape that is the same as the first feature amount extracted by the feature amount extraction unit and the first waveform shape set by the setting unit according to the first feature amount and the first driving information; The operating state of the power converter is diagnosed based on the second waveform shape and the second feature stored in the storage unit in association with the second operating information, and a state diagnosis unit that controls output of the control signal indicating the set waveform shape from the waveform shape changing unit;
   The power conversion device according to claim 7, comprising:
10. The physical quantity detection unit that detects a physical quantity correlated with the electromagnetic noise is configured by a common mode transformer.
    The power conversion device according to any one of claims 1 to 9.
11. The waveform shape control signal output unit changes the waveform shape of the switching waveform of the switching element by the waveform shape changing unit, using learning results obtained by machine learning.
    The power conversion device according to any one of claims 1 to 10.
12. The inverter including the switching element further includes the waveform shape changing section.
    The power conversion device according to any one of claims 1 to 11.
13. a model deviation calculation unit that calculates a model deviation based on the voltage, current, and estimated angular velocity of the AC motor; and a first estimated angular velocity that calculates a first estimated angular velocity as a low frequency component including a DC component of the actual angular velocity based on the model deviation. an angular velocity estimation section; a second angular velocity estimation section that calculates a second estimated angular velocity as a high frequency component of the actual angular velocity based on a specific high frequency component included in the model deviation; an adder for adding estimated angular velocities;
    The power conversion device according to any one of claims 1 to 12.
14. a rectifier that rectifies AC power supplied from a commercial power source;
    a capacitor connected to the output end of the rectifier;
    The control circuit includes the waveform shape control signal output section, and controls the operation of the inverter so that pulsation according to the physical quantity detected by the physical quantity detection section is superimposed on a drive pattern of a motor connected to the inverter. and a control unit that suppresses charging and discharging current of the capacitor;
    The power conversion device according to any one of claims 1 to 12.
15. a rectifier that rectifies AC power supplied from a commercial power source;
    a shorting section that shorts the commercial power supply via a reactor;
    a control section that includes the waveform shape control signal output section and controls a short circuit operation of the short circuit section;
    Equipped with
    The control unit shorts the shorting portion at least twice during a half cycle of the commercial power supply based on a load condition.
    The power conversion device according to any one of claims 1 to 12.
16. A rectifier that rectifies AC power supplied from a commercial power source,
    Equipped with
    The rectifying section includes:
    one or more switching elements;
    a waveform shape changing section capable of changing the waveform shape of a switching waveform of the switching element of the rectifying section;
    Equipped with
    The waveform shape control signal output section outputs the control signal when changing the switching waveform of the switching element of the rectification section in the waveform shape change section of the rectification section according to the physical quantity.
    The power conversion device according to any one of claims 1 to 15.
17. A motor drive device comprising the power conversion device according to any one of claims 1 to 16.
18. A refrigeration cycle application device comprising the power conversion device according to any one of claims 1 to 16.
19. The refrigerant used is any of R1234yf, R1234ze (E), R1243zf, HFO1123, HFO1132 (E), R1132a, CF3I, R290, R463A, R466A, R454A, R454B, R454C,
    The refrigeration cycle application equipment according to claim 18.
20. setting a switching speed of a digital gate driver module included in the power conversion device according to flammability of the refrigerant;
    The refrigeration cycle application equipment according to claim 19.

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